Some standard content:
ICS65.060
T63
JB
Machinery Industry Standard of the People's Republic of China
JB/T5179-2000
Tractor transmission fork technical conditions||tt ||Tractorshiftingforkrequirements2000-08-31 Released
National Machinery Industry Bureau
Released
Implemented on 2001-01-01
JB/T5179—2000
Foreword
This standard is a revision of B/T5179-91 "Technical Conditions for Tractor Gearbox Shift Forks". Compared with JB/T5179-91, the main technical content of this standard has the following changes - the material of the shift fork has been improved, the heat treatment requirements and manufacturing accuracy have been adjusted to ensure the specified reliability requirements; the scope of adoption of this standard can be expanded to "Motorcycle and car shift forks", and incorporate relevant requirements. This standard will replace JB/T5179-91 from the date of implementation. This standard is proposed and administered by the National Tractor Standardization Technical Committee. This standard was drafted by: Luoyang Tractor Research Institute, Kaifeng Hongda Fork (Group) Co., Ltd. The main drafters of this standard: Zhang Fuzhi, Shang Xiangsheng, Zhao Shengjun, Hu Zhenguo, Zhang Zhenqiang. 1 Scope
Machinery Industry Standard of the People's Republic of China
Tractor shifting fork technical conditions
Tractor shifting fork requirementsJB/T 5179—2000
Replaces JB/T5179—91| |tt||This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of tractors and other transmission forks. This standard applies to variable speed shift forks (hereinafter referred to as shift forks) of tractors and modified transport machines. The shift forks of motorcycles, agricultural transport vehicles and automobiles can also be used as a reference.
2 Reference standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T 699—1999
GB/T 8791986
GB/T 2828—1987
GB/T 30771999
GB/T 5617—1985||tt| |GB/T6060.1—1997
GB/T 8493—1987
GB/T 12362—1990
JB/T 5100—1991
3 Terms and Definitions
High-quality carbon structural steel
Elastic cylindrical pin
Batch-by-batch inspection and counting sampling procedures and sampling tables (applicable to continuous batch inspection) alloy structural steel
steel Determination of the effective hardened layer depth after induction quenching or flame quenching Surface roughness comparison sample casting surface
Metallography of cast carbon steel for general engineering
Tolerance of steel die forgings and machining allowance investment mold Technical conditions for cast carbon steel parts
This standard adopts the following definitions.
3.1 fark head
The part of the fork adjacent to the gear (or connecting sleeve). 3.2
3.3
farkworkingface
The plane on the fork that limits or promotes the axial movement of the gear (or connecting sleeve). Fork innerface
Fork head, two parallel planes (and tangent arc surfaces) containing the bottom surface of the gear (or connecting sleeve) groove. Groove groove
3.4
When shifting gears, the notch that accommodates and withstands the operation of the transmission operating parts 3.5 Guide pin/(guide) pin hole guidepin/guidehole The cylindrical circle on the shift fork that bears the transmission operation hole. 4 Technical Requirements
4.1 The shift fork shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.2 The recommended materials and quality indicators of the shift fork shall comply with the provisions of Table 1. Other grades of materials are allowed under the conditions of guaranteed use. The National Machinery Industry Bureau approved the implementation on 2001-01-01 on 2000-08-31
1
Quality index
standard
4.3
Fork material| |tt||Chemical composition
Mechanical properties
Microstructure
JB/T
Investment casting carbon steel
RZG310-570||tt ||According to JB/T5100
According to JB/T5100
According to GB/T8493
5179
9—2000
Table 1|| tt||High quality carbon structural steel
45, 50
Alloy structural steel
20Cr, 20CiMo
According to GB/T3077
According to GB/ T699 regulations
According to GB/T699 regulations
According to GB/T3077 regulations
No inspection or as specified in product drawings
Fork body, fork working surface, dial The hardness and depth of the groove or guide pin working surface should comply with the provisions of Table 2. The fork working surface and guide pin working surface generally use induction fire. The depth of the hardened layer (such as molybdenum plating layer) of other surface treatment methods should be marked on the drawing. .
Table 2
Inspection items
Hardness during normalizing
Fork body
Fork head working surface and
Guide pin (pin hole) working surface
groove working surface
hardness during tempering
carburizing depth
hardness
hardened layer depth
Single Hardness difference of parts
Chromium plating depth
Molybdenum plating depth
Hardness
HB
HB
mm
HRC
mm
HRC
mm
mm
HRC
Note: indicator ＊ can be used for motorcycle shift forks, indicator ★ can be used for Automobile shift fork 4.4
The main dimensional tolerance of the shift fork should comply with the provisions of Table 3 Table 3
Inspection items
Shaft hole diameter tolerance zone
The shift fork slides on the shaft
The shift fork is fixed on the shaft
Locating screw hole thread tolerance zone/Locating pin hole tolerance zone Fork head working surface thickness tolerance
mm
Fork mouth size tolerance zone
mm
Guide pin diameter tolerance mm / Pin hole diameter tolerance with positioning screw hole Dimensional tolerance between the center line of the pin hole and the working surface of the fork head mm Dimensional tolerance between working surfaces mm Angle tolerance between the center line of the guide pin (pin hole) and the line connecting the center of the fork and the shaft hole Note
1 When the length of the shaft hole is greater than 50mm, the shaft hole can be inspected with a pass-and-stop gauge. 2 indicators* can be used for motorcycle shift forks.
4.5
2
The position tolerance between the structural elements of the shift fork shall comply with the provisions of Table 4. 01-0.2
D10-B12
Quality index
156-229
45-55
≤6
45||tt ||240~298
0.3-0.85*
0.6~1.6
0.02-0.05
0.01~0.02
Quality index
H7, H8
H8, H9
6H/according to GB/T879
167~229 *
50~62＊★
≤4＊ ★
≥52★
0.07~0.10*
B12-H12 or H13*
0.05-0.1/H8, H9
0.1~0.2| |tt||0.1-0.2
± 30°
Inspection items
Perpendicularity tolerance of the fork working surface to the center line of the shaft hole JB/T
5179— 1 Inspection 01
Quality index
0.02-0.08*
0.1~02
2 If the distance from the shaft hole to the center of the fork working surface is greater than 150mm, the verticality tolerance can be relaxed 3 indicators *Can be used for motorcycle shift forks
4.6
The main surface roughness of the fork should comply with the requirements in Table 5. Table 5
Inspection items
Shaft hole surface roughness R
The fork slides on the shaft
The fork is fixed on the shaft
The fork head works Surface roughness R
Locating pin hole surface roughness R
Dial groove working surface roughness R
Fork surface roughness R
Guide pin working surface roughness R
Note: Index ＊ can be used for motorcycle shift forks, index ★ can be used for automobile shift forks 4. 7
4.8
The dimensional tolerance between non-machined surfaces should comply with the provisions of Table 6 table 6 | |tt||Inspection
Object
Machine surface
Die forgings
Investment castings
Non-machined surface
Table 7|| tt||Non-machined surface roughness R
Machined surface
Non-machined surface
Non-machined surface roughness R
Logo
Anti-rust treatment| |tt||3.2
6.3
6.3
Quality index
1.6, 0.8
3.2, 1.6
1.6, 3.2|| tt||Quality index
Ordinary-grade motorcycles such as tractors are stipulated in GB/T12362 and are in accordance with GB/T12362 Precision-grade I casting inspection items are stipulated in JB/T5100
Quality index||tt ||Standard
mm
中 0.03~00.10*
μm
1.6*
1.6＊★
3.2||tt| |3.2*
μm
No cracks, bumps, or oxide scale
No cracks or interlayers
50
12.5*||tt| |There shall be no cracks, bump marks, looseness,
pores, oxide scale
There shall be no cracks, looseness, pores, or interlayers 50★ (according to GB/T60601 regulations)
should be clear, Complete
Coated with anti-rust oil
Indicator* can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note:
4.9
Failure rate (failure rate)
3
JB/T5179—2000
Due to the structure, material, processing and assembly process of the fork, excessive deformation, breakage, and fork head may occur during use. Excessive wear of the working surface, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., which affect the normal operation of the locomotive are called failures (faults). The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. The sample size code F extracts the number of samples n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both a and b are qualified, it will be judged as qualified, otherwise it will be judged as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code number, equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
accn000
accn000
6
The main surface roughness of the shift fork should comply with the requirements in Table 5. Table 5
Inspection items
Shaft hole surface roughness R
The fork slides on the shaft
The fork is fixed on the shaft
The fork head works Surface roughness R
Locating pin hole surface roughness R
Dial groove working surface roughness R
Fork surface roughness R
Guide pin working surface roughness R
Note: Index ＊ can be used for motorcycle shift forks, index ★ can be used for automobile shift forks 4. 7
4.8
The dimensional tolerance between non-machined surfaces should comply with the provisions of Table 6 table 6 | |tt||Inspection
Object
Machine surface
Die forgings
Investment castings
Non-machined surface
Table 7|| tt||Non-machined surface roughness R
Machined surface
Non-machined surface
Non-machined surface roughness R
Logo
Anti-rust treatment| |tt||3.2
6.3
6.3
Quality index
1.6, 0.8
3.2, 1.6
1.6, 3.2|| tt||Quality index
Ordinary-grade motorcycles such as tractors are stipulated in GB/T12362 and are in accordance with GB/T12362 Precision-grade I casting inspection items are stipulated in JB/T5100
Quality index||tt ||Standard
mm
中 0.03~00.10*
μm
1.6*
1.6＊★
3.2||tt| |3.2*
μm
No cracks, bumps, or oxide scale
No cracks or interlayers
50
12.5*||tt| |There shall be no cracks, bumps, looseness,
pores, oxide scale
There shall be no cracks, looseness, pores, or interlayers 50★ (according to GB/T60601 regulations)
should be clear, Complete
Coated with anti-rust oil
Indicator* can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note:
4.9
Failure rate (failure rate)
3
JB/T5179—2000
Due to the structure, material, processing and assembly process of the fork, excessive deformation, breakage, and fork head may occur during use. Excessive wear of the working surface, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., which affect the normal operation of the locomotive are called failures (faults). The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for refund or replacement. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the shift fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. The sample size code F extracts the number of samples n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both a and b are qualified, it will be judged as qualified, otherwise it will be judged as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code number, equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
6
The main surface roughness of the shift fork should comply with the requirements in Table 5. Table 5
Inspection items
Shaft hole surface roughness R
The fork slides on the shaft
The fork is fixed on the shaft
The fork head works Surface roughness R
Locating pin hole surface roughness R
Dial groove working surface roughness R
Fork surface roughness R
Guide pin working surface roughness R
Note: Index ＊ can be used for motorcycle shift forks, index ★ can be used for automobile shift forks 4. 7
4.8
The dimensional tolerance between non-machined surfaces should comply with the provisions of Table 6 table 6 | |tt||Inspection
Object
Machine surface
Die forgings
Investment castings
Non-machined surface
Table 7|| tt||Non-machined surface roughness R
Machined surface
Non-machined surface
Non-machined surface roughness R
Logo
Anti-rust treatment| |tt||3.2
6.3
6.3
Quality index
1.6, 0.8
3.2, 1.6
1.6, 3.2|| tt||Quality index
Ordinary-grade motorcycles such as tractors are stipulated in GB/T12362 and are in accordance with GB/T12362 Precision-grade I casting inspection items are stipulated in JB/T5100
Quality index||tt ||Standard
mm
中 0.03~00.10*
μm
1.6*
1.6＊★
3.2||tt| |3.2*
μm
No cracks, bumps, or oxide scale
No cracks or interlayers
50
12.5*||tt| |There shall be no cracks, bump marks, looseness,
pores, oxide scale
There shall be no cracks, looseness, pores, or interlayers 50★ (according to GB/T60601 regulations)
should be clear, Complete
Coated with anti-rust oil
Indicator* can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note:
4.9
Failure rate (failure rate)
3
JB/T5179—2000
Due to the structure, material, processing and assembly process of the fork, excessive deformation, breakage, and fork head may occur during use. Excessive wear of the working surface, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., which affect the normal operation of the locomotive are called failures (faults). The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. The sample size code F extracts the number of samples n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both a and b are qualified, it will be judged as qualified, otherwise it will be judged as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code number, equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
accn000
accn000
accn000
accn000
8
The dimensional tolerance between non-machined surfaces should comply with the provisions of Table 6 Table 6
Types of roughness
Die forgings
Investment cast steel
The appearance of the fork should comply with the provisions of Table 7,
Inspection items
Inspection
Item
Processed surface
Die forgings
Investment mold Casting
Non-machined surface
Table 7
Non-machined surface roughness R
Machine surface
Non-machined surface
Non-machined surface Roughness R
mark
anti-rust treatment
3.2
6.3
6.3
quality index
1.6, 0.8 | |tt | /T5100 Class I casting inspection items
quality index
standard
mm
in 0.03~00.10*
μm
1.6*
1.6＊★
3.2
3.2*
μm
No cracks, bumps, oxide scale
No cracks, Interlayer
50
12.5*
shall not have cracks, bumps, looseness,
pores, oxide scale
shall not have cracks, looseness, pores, Interlayer 50★ (according to GB/T60601 regulations)
should be clear and complete
coated with anti-rust oil
Indicator * can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note :
4.9
Failure rate (failure rate)
3
JB/T5179—2000
Due to the fork structure, material, processing and assembly technology Causes such as excessive deformation and breakage of the shift fork during use, excessive wear of the working surface of the fork head, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., and affecting the normal operation of the locomotive are called failures (faults) . The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. The sample size code F extracts the number of samples n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both a and b are qualified, it will be judged as qualified, otherwise it will be judged as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code number, equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
8
The dimensional tolerance between non-machined surfaces should comply with the provisions of Table 6 Table 6
Types of roughness
Die forgings
Investment cast steel
The appearance of the fork should comply with the provisions of Table 7,
Inspection items
Inspection
Item
Processed surface
Die forgings
Investment mold Casting
Non-machined surface
Table 7
Non-machined surface roughness R
Machine surface
Non-machined surface
Non-machined surface Roughness R
mark
anti-rust treatment
3.2
6.3
6.3
quality index
1.6, 0.8 | |tt | /T5100 Class I casting inspection items
quality index
standard
mm
in 0.03~00.10*
μm
1.6*
1.6＊★
3.2
3.2*
μm
No cracks, bumps, oxide scale
No cracks, Interlayer
50
12.5*
shall not have cracks, bumps, looseness,
pores, oxide scale
shall not have cracks, looseness, pores, Interlayer 50★ (according to GB/T60601 regulations)
should be clear and complete
coated with anti-rust oil
Indicator * can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note :
4.9
Failure rate (failure rate)
3
JB/T5179—2000
Due to the fork structure, material, processing and assembly technology Causes such as excessive deformation and breakage of the shift fork during use, excessive wear of the working surface of the fork head, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., and affecting the normal operation of the locomotive are called failures (faults) . The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. Sample size code F extracts sample number n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both a and b are qualified, it will be judged as qualified, otherwise it will be judged as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code number, equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/bzxZ.net
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
2
Quality index
Ordinary grade motorcycles such as tractors are in accordance with GB/T12362 and are in accordance with GB/T12362 Precision grade I casting inspection items are in accordance with JB/T5100
Quality index
standard
mm
中 0.03~00.10*
μm
1.6*
1.6＊★
3.2| |tt||3.2*
μm
No cracks, bumps, oxide scale
No cracks, interlayers
50
12.5*| |tt||No cracks, bumps, looseness,
pores, oxide scale
No cracks, looseness, pores, interlayers 50★ (according to GB/T60601 regulations)
Should be clear and complete
Apply anti-rust oil
Indicator * can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note:
4.9
Failure rate ( Failure rate)
3
JB/T5179—2000
Due to the structure, material, processing and assembly process of the fork, excessive deformation and breakage of the fork may occur during use. , excessive wear of the working surface of the fork head, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., which affect the normal operation of the locomotive are called failures (faults). The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerance, position tolerance and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. The sample size code F extracts the number of samples n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both items a and b are qualified, it will be rated as qualified, otherwise it will be rated as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code, and equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
2
Quality index
Ordinary grade motorcycles such as tractors are in accordance with GB/T12362 and are in accordance with GB/T12362 Precision grade I casting inspection items are in accordance with JB/T5100
Quality index
standard
mm
中 0.03~00.10*
μm
1.6*
1.6＊★
3.2| |tt||3.2*
μm
No cracks, bumps, oxide scale
No cracks, interlayers
50
12.5*| |tt||No cracks, bumps, looseness,
pores, oxide scale
No cracks, looseness, pores, interlayers 50★ (according to GB/T60601 regulations)
Should be clear and complete
Apply anti-rust oil
Indicator * can be used for motorcycle shift forks, indicator★ can be used for automobile shift forks Note:
4.9
Failure rate ( Failure rate)
3
JB/T5179—2000
Due to the structure, material, processing and assembly process of the fork, excessive deformation and breakage of the fork may occur during use. , excessive wear of the working surface of the fork head, loosening or falling off of the positioning screws/pins for installing the shift fork, etc., which affect the normal operation of the locomotive are called failures (faults). The failure rate (failure rate) is obtained through statistics on the use of specified shift forks (same model and specifications). a) Statistics on the use of tractors and modified transporters show that the failure rate at 1500h is not greater than 1%; b) For motorcycles According to usage statistics, the failure rate at 6000km is no more than 0.5%. 4.10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift fork installed on the tractor and the modified transporter will be subject to the manufacturer's warranty If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifest during forging, casting, heat treatment and other processing and the acceptance criteria shall be agreed upon by both parties.
5.4.2 Radiography inspection
Use X or Y rays to inspect defects within the casting. The scope of inspection, degree of defects and acceptance standards shall be agreed upon by both parties. 5.5 The failure rate of the shift fork at 1500h (or 6000km) is calculated based on the use results of the same specification and model of shift fork in the equipped machine (vehicle), once every 5 years.
6 Inspection Rules
6.1 Factory Inspection
6.1.1 The shift fork must pass the inspection by the inspection department before leaving the factory, and a certificate of conformity should be attached when leaving the factory. 6.1.2 Factory inspection items shall be as specified in 4.4~4.8. 6.2 Type inspection
6.2.1 Products produced in batches shall undergo type inspection every two years according to the provisions of 4.2~4.8. 6.2.2 New products, products that have been significantly improved or produced by factory transfer shall undergo type inspection according to the provisions of 4.2~4.9 test. 6.2.3 Sampling plan
6.2.3.1 The inspection batch must be a qualified product, and the inspection batch N=281~5006.2.3.2 The selection of samples shall be based on the general inspection level I specified in GB/T2828, and a normal sampling inspection shall be adopted. The sample size code F extracts the number of samples n=20.
6.2.3.3 Qualified quality level and judgment
4
JB/T5179—2000
a Qualified quality level AQL=15, inspection items are 4.2~4.8, AQL The value is the number of unqualified points counted per 100 units of product. If the number of unqualified samples is less than or equal to Ac, it will be rated as qualified, and if it is greater than or equal to Re, it will be rated as unqualified. b) Reliability is assessed individually.
If both a and b are qualified, it will be judged as qualified, otherwise it will be judged as unqualified. 6.2.3.4 Users can also conduct inspection according to the transfer rules specified in GB/T2828. 7 Marking, Packaging, Transportation and Storage
7.1 Mark
The shift fork should generally be marked:
a) Manufacturer name or factory logo;
b) Product code .
The location and size of the mark are specified in the drawing. When making marks, care should be taken not to damage the surface of the parts. 7.2 Packaging and transportation
7.2.1 The shift fork must be cleaned, oil-sealed or wax-sealed, then wrapped in waterproof paper or plastic bags, and then placed in a cardboard box . The carton should be marked with:?) Manufacturer’s name, factory logo and address;
b) Product name and code, equipped machine (car) model; quality grade mark;
?Quantity:
③Factory date, production batch number, rust-proof validity period. 7.2.2 The carton should be accompanied by a product certificate signed by the manufacturer’s technical quality inspector. 7.2.3 The shift fork packed in a carton must be packed in a waterproof packaging box to ensure that it will not be damaged during normal transportation. The total weight of the box should not exceed 50kg. If the ordering unit agrees, simple packaging can also be used. 7.2.4 The packaging box should be accompanied by a packing list signed by the manufacturer's packer. The product name, code number and quantity should be marked on the list. 7.2.5 The outer surface of the packaging box should be marked:
a) Manufacturer’s name, factory logo and address;
b) Product name, code number, equipped machine (vehicle) model; c) Gross weight and quantity;
① Production batch number;
e) Shipping address and name of receiving unit;
\"Handle with care", "Moisture-proof" and other signs. 7.3 Storage
The shift fork should be stored in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the product will not rust within 12 months from the date of production.
5
People
China
Republic
Country
Machinery Industry Standards
Technical Conditions for Tractor Transmission Forks| | tt | 100044)*
1/16 printed sheet 1/
: Word count 12,000
Format 880×1230
First edition in November 2000
2000 First printing in November
Print number 1-500
Price 10.00 yuan
2000-177
No.
Machinery industry standard service network: http :/wwwJB.accn000
10 Warranty period
a) If the user abides by the installation, maintenance and use specified in the instruction manual, within 12 months from the date of delivery, the shift forks installed on tractors and modified transporters will be If the product cannot be used normally, the manufacturer shall be responsible for the return and replacement of the product. b) If the user abides by the installation, maintenance and use specified in the instruction manual, within 6000km from the date of delivery, if the shift fork installed on the motorcycle fails to work normally due to the responsibility of the manufacturer, the manufacturer shall be responsible for the warranty. Return and replacement 5 Test methods
5.1 The inspection methods for the chemical composition, mechanical properties, hardness and microstructure of the fork material shall be in accordance with the relevant standards. 5.2 Inspection of the depth of the hardened layer on the working surface of the fork head shall be in accordance with GB/T5617. 5.3 The main dimensional tolerances, position tolerances and surface roughness of the shift fork can be inspected using general or special measuring instruments. 5.4 Non-destructive testing of the shift fork
5.4.1 Penetrant flaw testing
The degree of defects that appear and manifes
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