JB/T 9856-1999 General technical requirements for die-cast aluminum alloy castings for rock drilling machinery and pneumatic tools
Some standard content:
ICS 73.100.10
Machinery Industry Standard of the People's Republic of China
JB/T9856-1999
General specifications of pressnredie-castingsof cast aluminium alloys uf rock drilling machines and pneumatic tools
1999-06-28 Issued
State Administration of Machinery Industry
2000-01-01 Implementation
JB/T9856—1999
This standard is a revision of ZBJ84012—88 "General Specifications of Pressure Die-castings of Aluminum Alloys of Rock Drilling Machines and Pneumatic Tools": During the revision, only the relevant provisions were revised, and the main technical content remained unchanged. This standard replaces ZBJ84012-88 from the date of implementation. This standard was proposed and approved by the National Technical Committee for Standardization of Rock Drilling Machines and Pneumatic Tools. The drafter of this standard is Tianshui Pneumatic Tools Factory, and the author of this standard is Wang Zhenjiang, the principal. This standard was first issued in the afternoon of 19BB, and this is the first time to be revised. China Machinery Industry Standard
Rock Drilling Machines and Pneumatic Tools
General Specifications of Pressure Die-castings of Cast Aluminum Alloys of RNC Drilling Machines and Pneumatic Tools
General Specifications of Pressure Die-castings of Cast Aluminum Alloys of RNC Drilling Machines and Pneumatic Tools
1 Scope
JB/T9856—1999
Replaces ZB184012—88
Standard specification covers the classification and grade of die castings, basic size tolerance grade, chemical composition test, mechanical property test, material quality of die castings, die casting efficiency, machining margin, surface shape and position tolerance, flow treatment, surface quality and deformation. This standard is applicable to die castings made of aluminum alloy by mechanical and pneumatic tools (hereinafter referred to as die castings) 2 Reference standards
The following standards contain provisions that are referenced in this standard. When this standard is published, the editions shown are valid. All other standards will be changed. Parties using this standard should consider the possibility of adding new editions by using the following standards: GB/T 196-1981
GB/T t971981
GB/T 606.1—1987
GB:138221952
GB/115054.1-1944
GB,T t5054.21994
GB/T15054.31994
GR/T15051.41994
.IR/T9855-1999
3 Classification and level
Basic size of ordinary screw effect (diameter 1~600mm) Tolerance and fit of ordinary thread (diameter 1-355mm) Surface roughness comparison sample casting near surface
Die casting alloy test
Small thread, tooth type
Small thread diameter and pitch series||tt| |Basic size of small thread
Minimum effective tolerance
General technical conditions for rock drill plates and pneumatic tool die castings 3.1 Requirements for the use of stop parts are divided into three categories, see Table 1 Table
Type of toothed parts
Usage requirements
Pressure castings that bear large dynamic loads, static loads and variable loads: pressure castings with relatively high speed of movement
Pressure castings that bear medium dynamic loads, static loads, etc. Rotating parts that generally have low loads
3.2 The use range of the surface of the casting is divided into three levels, see Table 2. The project was approved by the Machinery Industry Bureau of Xuejia on 1999-06-28. The surface quality, size accuracy, chemical composition and other aspects of the project are as follows: surface quality, size accuracy, chemical composition and other aspects of the project are as follows: 2000-01-01 Implementation
Surface quality line
JB/T9856-1999
Surfaces with high requirements for process; this is the surface of polished and ground surfaces: analysis of movement coordination: the risk should be small.
Surfaces with general or dense requirements: zinc, called extreme resistance, impact and drop without putty and assembly contact, etc.
Surfaces with good coating and home connection: paint putty surfaces and their fixed surfaces Note: When the surface roughness reaches the requirements, other "technical points" are allowed to meet the requirements. 3.3 The type and level of the pressed parts should be in The method of expression is as follows: JB/T98561999--~V
The surface torsion test that can reach the series is %,
-Generally equivalent to 16
One is equivalent to 3.2
One is equivalent to +6?
Die casting surface quality level
Die casting classification category
Casting quality standard number
3.4 If the category, grade and dimensional accuracy of the die casting are not specified, they shall be handled at the lowest level related to this standard. 3.5 The surface roughness inspection of the die casting shall be carried out in accordance with the provisions of GB16060.1 4 Basic size tolerance grade
The tolerance grade of the basic size of the pressing parts is divided into one level, see Table 3. The basic size of the casting
>5r-19
Eu--t6
>16-25
>25-40
>40-63
>63-100
-[00-160
16-230
>25-Gco
>400~630
The table includes the additional amount of tolerance
2 The tolerances of the small tolerance grades of the cast steel are included in the group of the size of the steel parts. JB/T9856-1999 4. The example of the cast transition channel is shown in Figure 1. The tolerances of its radius size are in accordance with the provisions of Table 4. The size difference of the concave radius R is "\, and the radius and the angle of the casting are the same. The size is less than 0.50m in Table 4 (1>10-18 F0~54) 4.3 The length and length of the parts are not as shown in Figure 2. The tolerances are in accordance with the provisions of Table 5.
Determined by the short length of the angle,
= 1015#
±0°50
±center*40*
230--50
+o'su*
81--11
>12(-18)
180-26ich
The sawing degree is determined by the length of the connecting link, the angle is 50--80
±°25
4.4 The tolerance of the wall thickness of the pressed stop piece is small, and it shall be handled according to the corresponding dimensional tolerance grade in Table 3. 5 Chemical composition
5.1 The analysis method of chemical composition of castings shall be in accordance with the provisions of [B/T9855, >80-[20
± tr20
120-180
180-260
JB9856-1999
5.2 The test results of chemical composition of castings shall comply with the provisions of [B/T9855. 5.3 The test of chemical composition of castings shall only be carried out by sampling, not by furnace or batch. 6 Mechanical property test
6.1 The mechanical property test of castings shall be in accordance with the provisions of [B/T9855. 2 The test of mechanical properties of castings shall only be carried out by sampling, not by batch. The single casting sample shall be used for casting test, and the result shall comply with the provisions of 9835. The single casting sample must be from the same casting and the same furnace. 63 When the quality analysis of castings is necessary, the body sample shall be taken. The body sample is valid for only one piece (except for the sample with internal and external defects). Its shape and size shall comply with the provisions of G13822. The tensile strength of the sample shall not be less than 75% of the single molding test sample, and the elongation shall not be less than 50% of the single casting test sample. The mechanical properties of the three samples are allowed to be slightly different. The minimum values of strength and elongation shall not be less than 65% and 35% of the single molding test sample. The average value of the three samples is qualified and qualified; if unqualified, a secondary quality analysis is allowed: the second unqualified is determined as a unqualified product. The slope
7.1. The casting inclination of the casting is not included in the range of use. For non-1 surfaces, the hole (containing surface) is based on the small end; the shaft (containing surface) is based on the large end. For machining, the hole is based on the human end; the shaft is based on the small end. 7. The casting inclination of the Z-shaped casting is in accordance with the assumptions in Table 6: the casting inclination of the outer wall of the pressure casting is half of the inner casting inclination. The casting size of the pressure casting is small. The casting material pressure is >1D~15. 7.3 The casting hole diameter, maximum hole detection and casting inclination of the casting are in accordance with the provisions of the regulations. Table
Bell diameter
>16-20
>20-25
Brain width
>15-20
1030°
Casting depth
1-30°
JB/T9856—199%
7.4The minimum casting reverse slope of the casting property shall be in accordance with the provisions of Table*. Table
Metal type
Aluminum alloy
Blunt parts
7.5The surface of the parts is solid, and the front angle of the symbol is 10°-25°. The 7H, 7H, and 6H precision inspection of die-casting end threads of screw thread parts in accordance with GB/1196, GB/197, and GB15054.1-15054.4 is allowed to have a value of less than 0.1% misalignment. Only the standard gauge is allowed to be used for inspection. Half of the misalignment is allowed to be repaired to meet the requirements. 8.2: The maximum diameter of the corrected end thread shall be in accordance with the provisions of Table 9. Table 9
Small diameter
Small distance
Note: The numbers in the table are for a single mold. 8.3 The minimum diameter and minimum distance of the die casting die shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape
The effective mold core formed by the whole or the silver mold
The effective mold core formed by the operation
JB/T9856-1999
8.4 Surface scratches caused by removing the parts from the casting (marked by the mold 1) are allowed, but the first two teeth of the effective mold are not allowed to be under-cast or under-cast.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Center depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
Highest distance from the edge of the unit
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Over [thickness]
Detection length is a number
13.1 The delivery of castings should be filled in with a certificate or warehouse form, and stamped by the inspection team. 13.2 The certificate or warehouse form should be noted:
a) Name of the original casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings should be accompanied by the test results of chemical composition and mechanical properties, and stamped by the inspection team. 13.4 The packaging of castings should ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-control of the pressed parts according to the relevant provisions of this standard.The casting inclination of the casting is in accordance with the assumption in 6: the casting inclination of the outer wall of the casting is half of the inner casting angle. Table 6
The inner size of the casting is small
Casting material pressure
>1D~15
7.3 The diameter of the casting hole, the maximum hole and the casting inclination of the casting are in accordance with the provisions of the regulations. Table
Diameter
>16-20
>20-25
Maximum diameter
>15-20
1030°
Casting angle
1-30°
JB/T9856—199%
7.4 The minimum casting inclination of the casting is in accordance with the provisions of Table *. Table
Metal type
Aluminum alloy
Blunt parts inner limb
7.5 The surface of the parts is solid, and the front angle of the symbol is 10°-25°. The die-casting end thread of the die-casting parts is 7H, 7H, and 6H shown in GB/1196, GB/197, GB15054.1-15054.4. The precision inspection of the die-casting operation effect is allowed to have a value of less than 0.1% misalignment. It is only allowed to be inspected by the standard gauge. It is allowed to meet the standard after half repair.
8.2: The maximum center diameter of the external end effect shall be in accordance with the provisions of Table 9. Table 9
Small diameter
Small distance
Note: The numbers in the table are for a single mold. 8.3 The minimum diameter and minimum distance of the die casting die shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape
The effective mold core formed by the whole or the silver mold
The effective mold core formed by the operation
JB/T9856-1999
8.4 Surface scratches caused by removing the parts from the casting (marked by the mold 1) are allowed, but the first two teeth of the effective mold are not allowed to be under-cast or under-cast.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Center depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
Highest distance from the edge of the unit
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Too thick]
The length of the test piece is a number
13.1 The delivery of the castings shall be filled in with a certificate or warehouse form, and shall be stamped by the inspection team. 13.2 The certificate or warehouse form shall be noted:
a) Name of the casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings shall be accompanied by the test results of chemical composition and mechanical properties, and shall be stamped by the inspection team. 13.4 The packaging of the castings shall ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-testing of the castings according to the relevant provisions of this standard.The casting inclination of the casting is in accordance with the assumption in 6: the casting inclination of the outer wall of the casting is half of the inner casting angle. Table 6
The inner size of the casting is small
Casting material pressure
>1D~15
7.3 The diameter of the casting hole, the maximum hole and the casting inclination of the casting are in accordance with the provisions of the regulations. Table
Diameter
>16-20
>20-25
Maximum diameter
>15-20
1030°
Casting angle
1-30°
JB/T9856—199%
7.4 The minimum casting inclination of the casting is in accordance with the provisions of Table *. Table
Metal type
Aluminum alloy
Blunt parts inner limb
7.5 The surface of the parts is solid, and the front angle of the symbol is 10°-25°. The die-casting end thread of the die-casting parts is 7H, 7H, and 6H shown in GB/1196, GB/197, GB15054.1-15054.4. The precision inspection of the die-casting operation effect is allowed to have a value of less than 0.1% misalignment. It is only allowed to be inspected by the standard gauge. It is allowed to meet the standard after half repair.
8.2: The maximum center diameter of the external end effect shall be in accordance with the provisions of Table 9. Table 9
Small diameter
Small distance
Note: The numbers in the table are for a single mold. 8.3 The minimum diameter and minimum distance of the die casting die shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape
The effective mold core formed by the whole or the silver mold
The effective mold core formed by the operation
JB/T9856-1999
8.4 Surface scratches caused by removing the parts from the casting (marked by the mold 1) are allowed, but the first two teeth of the effective mold are not allowed to be under-cast or under-cast.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Center depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
Highest distance from the edge of the unit
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Over [thickness]
Detection length is a number
13.1 The delivery of castings should be filled in with a certificate or warehouse form, and stamped by the inspection team. 13.2 The certificate or warehouse form should be noted:
a) Name of the original casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings should be accompanied by the test results of chemical composition and mechanical properties, and stamped by the inspection team. 13.4 The packaging of castings should ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-control of the pressed parts according to the relevant provisions of this standard.3. The diameter of the casting hole, the minimum hole detection and the casting inclination of the parts shall comply with the provisions of the regulations. Table
Bell diameter
>16-20
>20-25
The maximum casting depth
>15-20
1030°
Casting depth
1-30°
JB/T9856—199%
7.4 The minimum casting inclination of the casting shall comply with the provisions of Table*. Table
Metal type
Aluminum alloy
Blunt parts
7.5 The surface of the parts is solid, and the front casting depth of the symbol is 10°-25°. The 7H, 7H, and 6H precision inspection of die-casting end threads of screw thread parts in accordance with GB/1196, GB/197, and GB15054.1-15054.4 is allowed to have a value of less than 0.1% misalignment. Only the standard gauge is allowed to be used for inspection. Half of the misalignment is allowed to be repaired to meet the requirements. 8.2: The maximum diameter of the corrected end thread shall be in accordance with the provisions of Table 9. Table 9
Small diameter
Small distance
Note: The numbers in the table are for a single mold. 8.3 The minimum diameter and minimum distance of the die casting die shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape
The effective mold core formed by the whole or the silver mold
The effective mold core formed by the operation
JB/T9856-1999
8.4 Surface scratches caused by removing the parts from the casting (marked by the mold 1) are allowed, but the first two teeth of the effective mold are not allowed to be under-cast or under-cast.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Center depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
Highest distance from the edge of the unit
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Over [thickness]
Detection length is a number
13.1 The delivery of castings should be filled in with a certificate or warehouse form, and stamped by the inspection team. 13.2 The certificate or warehouse form should be noted:
a) Name of the original casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings should be accompanied by the test results of chemical composition and mechanical properties, and stamped by the inspection team. 13.4 The packaging of castings should ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-control of the pressed parts according to the relevant provisions of this standard.3. The diameter of the casting hole, the minimum hole detection and the casting inclination of the parts shall comply with the provisions of the regulations. Table
Bell diameter
>16-20
>20-25
The maximum casting depth
>15-20
1030°
Casting depth
1-30°
JB/T9856—199%
7.4 The minimum casting inclination of the casting shall comply with the provisions of Table*. Table
Metal type
Aluminum alloy
Blunt parts
7.5 The surface of the parts is solid, and the front casting depth of the symbol is 10°-25°. The 7H, 7H, and 6H precision inspection of die-casting end threads of screw thread parts in accordance with GB/1196, GB/197, and GB15054.1-15054.4 is allowed to have a value of less than 0.1% misalignment. Only the standard gauge is allowed to be used for inspection. Half of the misalignment is allowed to be repaired to meet the requirements. 8.2: The maximum diameter of the corrected end thread shall be in accordance with the provisions of Table 9. Table 9
Small diameter
Small distance
Note: The numbers in the table are for a single mold. 8.3 The minimum diameter and minimum distance of the die casting die shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape
The effective mold core formed by the whole or the silver mold
The effective mold core formed by the operation
JB/T9856-1999
8.4 Surface scratches caused by removing the parts from the casting (marked by the mold 1) are allowed, but the first two teeth of the effective mold are not allowed to be under-cast or under-cast.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Central depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
High side distance quotient
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Too thick]
The length of the test piece is a number
13.1 The delivery of the castings shall be filled in with a certificate or warehouse form, and shall be stamped by the inspection team. 13.2 The certificate or warehouse form shall be noted:
a) Name of the casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings shall be accompanied by the test results of chemical composition and mechanical properties, and shall be stamped by the inspection team. 13.4 The packaging of the castings shall ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-testing of the castings according to the relevant provisions of this standard.2: The minimum diameter and the minimum distance of the outer end of the correction shall be in accordance with the provisions of Table 9. Table 9
The minimum diameter and the minimum distance of the die-casting inner diameter shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape of the mold
The minimum diameter of the die formed by the whole or the silver solution
The core of the mold formed by the operation
JB/T9856-1999
8.4 It is allowed to have surface scratches caused by removing the holder (by the mold mark 1) from the weak casting, but the first two teeth of the effective mold are not allowed to be undercast or holed.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Center depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
Highest distance from the edge of the unit
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Over [thickness]
Detection length is a number
13.1 The delivery of castings should be filled in with a certificate or warehouse form, and stamped by the inspection team. 13.2 The certificate or warehouse form should be noted:
a) Name of the original casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings should be accompanied by the test results of chemical composition and mechanical properties, and stamped by the inspection team. 13.4 The packaging of castings should ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-control of the pressed parts according to the relevant provisions of this standard.2: The minimum diameter and the minimum distance of the outer end of the correction shall be in accordance with the provisions of Table 9. Table 9
The minimum diameter and the minimum distance of the die-casting inner diameter shall be in accordance with the provisions of Table 10: Table 10
The minimum diameter of the die formed by the whole and the shape of the mold
The minimum diameter of the die formed by the whole or the silver solution
The core of the mold formed by the operation
JB/T9856-1999
8.4 It is allowed to have surface scratches caused by removing the holder (by the mold mark 1) from the weak casting, but the first two teeth of the effective mold are not allowed to be undercast or holed.
8.5 For pressed internal and external threads, the depth of the two teeth after every five pitches is not allowed to be greater than one-fifth of the first two teeth.
9 Machining allowance
9.1 The machining allowance of the pressed parts shall comply with the provisions of Table 1:
The above-mentioned large size
Single and T will be measured
>50-120
>120-260
>266~400
P4D0-630.
9.2 The table is marked with a mark. The tip is marked with a mark on the surface, and the left side indicates the mark. For example, the table with a small size of 0.50 has a mark of 0.50mm.
10 Surface shape and position tolerance
11 The tolerance of the semi-casting part is in accordance with the provisions of Table 12. 12
Basic size
Tolerance of shaping
Tolerance after shaping
>63-100
(door. 2 The valley difference of the parallelism of the die casting is in accordance with the provisions of Table 13. Table 13
Measurement and matching
Some other standard surfaces
The position of the back
->63-160
>[60-250
250-4m1
Tolerance of the same half cable 5,
>10n-160
4 companies within the two halves ;
Note: When the tolerance of the parallelism of the connecting parts does not meet the requirements, it is allowed to >160-250
>250-400
The service difference of the two movable parts within the half of the company is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. The difference between the axis centerline base and the axis center load in the same half of the company is 0.245
1.3 The coaxial tolerance of the die casting is in accordance with the provisions of Table 14. The tolerance of each single mold is as follows: JB/T9856-1999-18-50-56-120-124-260-2366-.5uu-tt-| The wash mouth, over-flow, overflow, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but there is a mark of paint on the surface: add 1 The filter thickness after cleaning shall not exceed 1.50mm: 12 Surface quality
1z, 1. The pressed parts are not allowed to have cracks, holes and other penetrating defects. 12.2 The "gram standard" indicated on the low-profile parts drawing shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, and equal signs shall be removed. 124 Only small effects on the use of the original part are allowed on the surface of the original part. The value of the mark shall not exceed 0.20mm.
12.5 The allowable defects on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Appropriate distance from the pure part
Table Surface blood volume measurement
1: In the corresponding position of the company, the maximum allowed to exist at the same time +:
2. The length of the defect shrinkage flow
the length of the product
the name of the turn
the actual object trace
the flat diameter
the flat diameter
>3, the surface
the corner line fast depth
the total of various defects. JB/T9856- 1999
Table 15 (light)
Fast area. Percentage of total area not covered
Central depth
Number of defects not covered
Percentage of defect area
Number of defects not covered per 1 mm
Number of defects not covered per unit
High side distance quotient
Porosity penetration||t t||100cm defect rate number does not exceed the treatment
earn a statement that the number of not allowed to pass
air-holding edge frequency origin
gas machine creation depth
casting side length 10mm
make bamboo side length>[00ram
surface weight, the percentage of surface area
surface quality level
pressed poetry after machining, the surface quality should meet the requirements of Table 16. 12.6
surface area
>25-60
>60~150
>159-350
minimum distance
path; exploration
avoid small courtyard
yard! Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Over [thickness]
Detection length is a number
13.1 The delivery of castings should be filled in with a certificate or warehouse form, and stamped by the inspection team. 13.2 The certificate or warehouse form should be noted:
a) Name of the original casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings should be accompanied by the test results of chemical composition and mechanical properties, and stamped by the inspection team. 13.4 The packaging of castings should ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-control of the pressed parts according to the relevant provisions of this standard.2 The parallelism difference of die castings is determined by Table 13. Table 13
Measurement and matching
Some other standard surfaces
are located in the same position. The tolerance is 5,
>10n-160
4 within the company;
Note: When the parallelism tolerance of the connection does not meet the requirements, it is allowed to be >160-250
>250-400
The service difference of the two active parts within the company half is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. Axis centerline base*axis center load position back
same·half floor
11 tolerance
within
in the period single mode
tolerance,
JB/T9856-1999
-18-50
>56-120
124-260
2366-.5uu
The wash mouth, overshoot, overflow stop, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but it is allowed to have guessing marks: 1 The filter volume after cleaning on the surface shall not exceed 1.50mm: 12 Surface quality
1z, 1 The die casting is not allowed to have cracks, holes and other penetrating defects, 12.2 The "standard" indicated on the drawing of the low-profile parts shall maintain integrity and no protrusions or depressions are allowed. 12.3 Long parts: 1. The pattern, literature, equal sign should be eliminated. 124 The minimum influence on the use of the original part is allowed on the surface of the good part. The protrusions and depressions are allowed, and the ratio shall not exceed 0.20mm.
12.5 The defects allowed on the non-machined surface of the die casting shall comply with the provisions of Table 15: Table 15
Defect name
Defect area, not exceeding the percentage of the total area
Length is not greater than the original size of the base wheel
The number of places where the center is allowed to pass
Distance from the edge of the pure part
Surface blood volume measurement
1: At the corresponding position of the part| |tt||Maximum allowed to exist at the same time:
2. Length refers to the length of the defect shrinkage
Route name
The actual defect
The flat diameter
The flat diameter
>3, surface
The corner line depth
The total of various defects.
JB/T9856-1999
Table 15 (light)
The area of the defect. The percentage of the total area
The depth of the defect
The number of defects that are not allowed to pass
The percentage of the defect surface area
The number of defects that cannot pass per 1mm
The number of defects that cannot pass
The height The distance between the side ball of the express delivery and the air hole is 100cm. The number of defects does not exceed the number of defects. The number of defects that cannot be exceeded is not allowed. The air-sustaining side frequency origin is the depth of the air machine. The side length of the casting is 10mm. The side length of the bamboo is > [00mm. The surface quality level of the surface is not exceeded. After the casting is machined, the surface quality should meet the requirements of Table 16. 12.6 Surface area > 25-60 > 60~150 > 159-350 Minimum distance > 100mm; detection distance > 100mm. Before loading, the cage is allowed to be filled with reverse addition of two gases at the same time, the number of the north and south gas is not more than 1, the total number is not less than 10, and the margin is not less than 0mm. The length of the residual fast is not more than 5% of the length of the side. The minimum distance between the two sides is 12.7 The pressure piece has been mechanically added with 1 frequency: except for the first one, which is not allowed to have defects, the quality requirements of the rest of the table should meet the requirements of Table 17. 13 Delivery half-average diameter is not more than 2 times the course JB/ T9856—1999
[Over [thickness]
Detection length is a number
13.1 The delivery of castings should be filled in with a certificate or warehouse form, and stamped by the inspection team. 13.2 The certificate or warehouse form should be noted:
a) Name of the original casting:
h) Code:
c) Joint stock brand:
d) Quantity
13.3 The delivery of castings should be accompanied by the test results of chemical composition and mechanical properties, and stamped by the inspection team. 13.4 The packaging of castings should ensure that there is no mechanical damage during transportation. 13.5 The user is allowed to perform re-control of the pressed parts according to the relevant provisions of this standard.2 The parallelism difference of die castings is determined by Table 13. Table 13
Measurement and matching
Some other standard surfaces
are located in the same position. The tolerance is 5,
>10n-160
4 within the company;
Note: When the parallelism tolerance of the connection does not meet the requirements, it is allowed to be >160-250
>250-400
The service difference of the two active parts within the company half is 0.245
1.3 The coaxial tolerance of die casting is in accordance with the provisions of Table 14. Axis centerline base*axis center load position back
same·half floorwwW.bzxz.Net
11 tolerance
within
in the period single mode
tolerance,
JB/T9856-1999
-18-50
>56-120
124-260
2366-.5uu
The wash mouth, overshoot, overflow stop, burr, original degree, etc. on the delivery part should be cleaned up: the non-machined surface should be cleaned up and flush with the surface of the die casting, but it is allowed to have guessing marks
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