Some standard content:
QB/T2311--1997
This standard is revised based on the original professional standard ZBY11022-1989 "Timer Spring". During the revision process, some technical contents were supplemented, and then the writing format was sorted and standardized. The main differences between this standard and the original professional standard are: the writing format and expression method are implemented in accordance with GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Drafting and Expression of Standards Part 1: Basic Regulations for Standard Writing": 3.1 of the original standard is removed; 3.2 stipulates that the length dimension series is replaced by the last digit of the length; 4.2 The spring width tolerance is replaced by the grade tolerance mark instead of the size segment mark; 4.7 Different requirements for straightness are specified for springs made of different materials; Appendix A (Technical conditions for timer springs based on hardness and thickness) is added. Appendix A of this standard is the appendix of the standard. This standard was proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. The drafting unit of this standard is Shanghai Clock and Watch Material Factory. The main drafters of this standard are Tong Yueming, Hao Wenliang and Chen Jianli. From the date of implementation of this standard, the professional standard ZBY11022-1989 "Timer Spring" issued by the former Ministry of Light Industry will be invalid. 445
1 Scope
Light Industry Industry Standard of the People's Republic of China
Timer Spring
QB/T 2311—1997
This standard specifies the size specifications, requirements, test methods, inspection rules, marking, labeling, packaging, transportation and storage of timer springs. This standard applies to timer springs.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is released, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1031—1995 Surface roughness parameters and their values GB/T2828-1987 Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) GB/T 2829—1987
GB/T 4340—1984
3 Dimensions
3.1 Width dimensions
Periodic inspection counting sampling procedures and sampling tables (applicable to inspection of production process stability) Metal Vickers hardness test method
The width dimensions of the spring are shown in Table 1.
3.2 The last digit of the length
The last digit of the length of the spring in millimeters should be 5 or 0. 4 Technical requirements
4.1 Mechanical properties
The mechanical properties of the spring are shown in Table 2.
The torque change rate and small torque attenuation rate in Table 2 are calculated according to formula (1) and formula (2) respectively. Mo.- Mmm × 100
BM(%) =
Sm(%）
Wherein: Manet-
—Msng
The small torque output by the spring after several times of fatigue. Approved by China Light Industry Federation on September 1, 1997
TKAONKAca-
（1）
.（2）
Implemented on May 1, 1998
QB/T 2311—1997
Project name
Large torque.cN·m
Small torque.cN·m
Torque change rate, %
Small torque attenuation rate, %
Fatigue life, times
Output torque can also be specified according to user requirements, with a nominal value and positive and negative stop difference, in accordance with
According to the agreement between the supply and demand parties or the product drawing
≥10 000
2 According to the user's requirements for the mechanical properties of the spring, hardness and thickness can also be selected for evaluation. The relevant technical conditions are shown in Appendix A (Appendix to the standard). 4.2 Dimensional accuracy
The dimensional accuracy of the spring is shown in Table 3.
4.3 Surface roughness
Dimension name
Inner hook fixing circle
Ring outer hook fixing ring
Spring fastening size
Symmetry of the center line of the end hole
Roughness of the two planes of the spring R. Not more than 0.8μm. 4.4V-shaped outer hook fastness
The V-shaped outer hook fastness of the spring should be greater than 2 times the output torque value of the spring. 4.5 Surface treatment
The surface of the spring made of spring steel needs to be treated with color tone, and the color of the same spring should be uniform. 4.6 Appearance
Tolerance requirements
h18 (take integer)
Less than width tolerance
4.6.1 The spring plane is not allowed to have defects such as rust, creases, delamination, etc. that affect the quality of use. 4.6.2 The side of the spring should be smooth, and the sharp angles should be chamfered and rounded. Rust, cracks, burrs and obvious uneven cutting are not allowed to affect the quality of use.
4.6.3 The end face of the formed spring is not allowed to have obvious uneven towers. 4.7 Straightness (applicable to straight strip delivery)
4.7.1 The straightness of the spring band made of spring steel shall not exceed 2mm per meter. 4.7.2 The straightness of the spring band made of stainless steel shall not exceed 8mm per meter. 4.8 Special requirements
Special requirements for products can be negotiated by the supply and demand parties. 5 Test methods
5.1 Mechanical properties test
5.1.1 Test conditions and instrument accuracy
QB/T 2311—1997
a) The diameter of the test shaft and the inner diameter of the box should be consistent with those actually used. For boxes without boxes or other boxes with special inner diameters, the supply and demand parties can negotiate and determine the appropriate inner diameter of the box as a condition for delivery test. b) Before testing each item of mechanical properties, the tested spring should be tightened and relaxed 5 times before testing; c) The spring should be lubricated during testing; d) The accuracy of the spring torque meter is ±2%, and the reading display should be stable and repeatable when testing torque. 5.1.2 Torque test
During the torque test, after the mainspring is fully wound up, the torque value measured when it is withdrawn 0.5 turns is the large torque M.0.5. When it continues to withdraw to the effective working number of turns n (the timer mainspring is generally withdrawn 1 turn), the torque value measured is the small torque Mm. The results should all comply with the provisions of 4.1. 5.1.3 Torque change rate Bm
Substitute the large torque Mo.5 value and the small torque Msg value measured by the method in 5.1.2 into formula (1) for calculation. The result should comply with the provisions of 4.1. 5.1.4 Small torque attenuation rate Sm
After the small torque M.ng value is obtained by the method in 5.1.2, the mainspring is fatigue tested for 10,000 times. After that, the mainspring is disassembled, cleaned and lubricated, and the small torque Msng value after fatigue is measured again. Then, it is substituted into formula (2) for calculation. The result should comply with the provisions of 4.1. 5.1.5 Fatigue life Ng
The fatigue life test of the spring is carried out on a fatigue tester. The test speed should not exceed 100 times per minute. During the test, the spring to be tested is fully tightened and then returned to the measurement point of the large torque for 0.5 turns as the starting point and the end point. The fatigue tightening and relaxing graph number should be equal to the effective working number. One reciprocating cycle is one fatigue test. The result should comply with the provisions of 4.1. 5.2 Dimensional accuracy
5.2.1 Width
The width of the spring is measured with a first-level precision universal measuring tool with a scale value of 0.01mm. The result should comply with the provisions of 4.2. 5.2.2 Length
The length of the spring is measured with a steel ruler. The result should comply with the provisions of 4.2. 5.2.3 The inner hook fixing circle and the annular outer hook fixing circle are checked with a smooth limit gauge. The result should comply with the provisions of 4.2. 5.2.4 Spring tightening dimensions
Spring tightening dimensions shall be measured at the minimum diameter with a vernier caliper with a scale value of 0.02mm. The results shall comply with the provisions of 4.2. 5.2.5 End hole centerline symmetry
The centerline symmetry shall be measured with a special horizontal dial indicator or a projector with a magnification of 10 times. The results shall comply with the provisions of 4.2. 5.3 Surface roughness
The surface roughness of the two planes of the spring shall be measured with a light section microscope in accordance with the provisions of GB/T1031. The results shall comply with the provisions of 4.3. 5.4 V-shaped outer hook fastness
The V-shaped outer hook fastness shall be measured with a spring torque meter in accordance with the method specified in 5.1.2. The results shall comply with the provisions of 4.4. 5.5 Surface treatment and appearance
The surface treatment and appearance quality of the spring shall be inspected by visual inspection with normal vision under natural light or general fluorescent lighting. The results shall comply with the provisions of 4.5 and 4.6 respectively.
5.6 Straightness
When measuring the straightness of the spring belt, place the part to be tested on a flat surface, place a 1m long ruler against the concave surface of the belt, and measure the maximum distance between the belt and the ruler. The result should comply with the provisions of 4.7. 5.7 Special requirements
For products with special requirements, the test methods can be negotiated and decided by the supply and demand parties. 448
HriKAoNiKAca-
6 Inspection rules
6.1 Factory inspection
QB/T2311-1997
6.1.1 Factory inspection shall be carried out in accordance with the provisions of GB/T2828. The classification of non-conforming products, inspection items, inspection level (IL), sampling plan, and acceptable quality level (AQL) are shown in Table 4.
Unqualified classification
Small torque
Large torque
Inspection items
Torque change rate
V-shaped outer hook fastness
Inner hook fixing circle
Ring-shaped outer hook fixing valve
Spring purple solid size
Symmetry of end hole center line
Surface treatment
Appearance quality
Straightness (applicable to straight delivery)
The composition of the batch shall be agreed upon by the supply and demand parties.
Corresponding clauses
6.1.3 Inspection strictness shall be determined in accordance with 4.6 of GB/T2828-1987. AQL
Sampling plan
6.1.4 According to the items determined in 6.1.1~6.1.3 above, the sampling plan shall be retrieved according to 4.8 of GB/T2828-1987 to determine the sample size and judgment array.
6.1.5 The judgment of qualified and unqualified products in factory inspection shall be carried out according to 4.11 of GB/T2828-1987. 6.1.6 The disposal after factory inspection shall be carried out according to 4.12 of GB/T2828-1987. 6.2 Type inspection
6.2.1 Type inspection shall be carried out according to GB/T2829. Its inspection items, unqualified classification, judgment level, sampling plan, unqualified quality level (RQL) are shown in Table 5.
Unqualified classification
Inspection items
Small torque
Large torque
Torque change rate
Small torque decay rate
Fatigue life
V-shaped outer hook fastness
Corresponding clause
Discrimination level
Sampling plan
Number of samples
Unqualified classification
Inspection items
Inner hook fixing circle
Ring-shaped outer hook fixing circle
Spring tightening ruler Size
Symmetry of the center line of the end hole
Surface roughness
Surface treatment
Appearance quality
Straightness (applicable to straight delivery)
QB/T2311-1997
Table 5 (end)
Corresponding clauses
Discrimination level
Sampling plan Number of samples
6.2.2 The samples for type inspection shall be randomly selected from a batch or several batches that have passed the factory inspection, and the spare samples shall be determined by the inspection unit. 6.2.3 The judgment of passing and failing type inspection shall be carried out in accordance with the provisions of 4.11 of GB/T2829-1987. 6.2.4 The disposal after type inspection shall be carried out in accordance with the provisions of 4.12 of GB/T2829-1987. 6.2.5 The cycle of type inspection shall be determined by each production unit or negotiated by the supply and demand parties. However, type inspection should be conducted in any of the following cases.
a) Pre-production and identification of new products or old products for transfer to other factories; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) After normal production, periodic inspection should be conducted regularly or after a certain amount of production has been accumulated; d) When the product is resumed after a long period of suspension; e) When there is a significant difference between the factory inspection result and the last type inspection; f) When the national quality supervision agency proposes a type inspection requirement. 6.2.6 The sampling plan for type inspection can also be agreed upon by the inspection department and the manufacturer. 7 Marking, labeling, packaging, transportation and storage 7.1 Marking
The outer packaging box of the factory-made clockwork products should be marked with: a) Product name;
b) Product specifications;
c) Product quantity;
d) Manufacturer name;
e) Moisture-proof mark.
7.2 Label
Each box of spring products must have a product inspection certificate, which should contain the following information: a) manufacturer name, address, trademark,
b) production date;
c) standard number:
d) product name and specification;
e) inspector's signature;
f) product quantity;
-r KAON KAca-
g) precautions.
7.3 Packaging
QB/T 2311-- 1997
The surface of the spring should be coated with anti-rust oil, packed with moisture-proof paper or plastic bags, and then packed into packaging boxes. The packaging boxes should be moisture-proof and can ensure that the products will not be damaged due to packaging damage or breakage during long-distance transportation. 7.4 Transportation, storage
The product should be protected from rain and moisture during transportation, and the storage location must be dry. It is not allowed to be stored together with corroded items. 7.5 For users with special requirements for signs, labels and packaging, the supply and demand parties can negotiate separately. 451
Thickness and hardness
QB/T2311-1997
Appendix A
(Appendix of the standard)
Technical conditions for timer springs with hardness and thickness as the basis for evaluation See Table A1 for spring thickness accuracy and hardness.
Thickness, mm
0. 08~ 0. 15
>0. 15 ~0. 25
>0. 25 ～0. 50
Ordinary precision (P)
Allowable deviation
Higher precision (H)
High sugar content (G)
According to the requirements of the purchaser, timing springs with dimensional accuracy and hardness other than those in Table A1 can be supplied after mutual agreement. Factory inspection
540~650
530~640
Factory inspection shall be carried out in accordance with the provisions of GB/T2828. The inspection items, inspection level (IL), acceptable quality level (AQL) and sampling plan are shown in Table A2.
Inspection items
Note: For factory hardness inspection, short-length materials from the same batch can be used instead. A4 Other items
Other dimensional accuracy and surface quality shall be in accordance with the relevant provisions of the standard. 452
-r KAON KAca-
Sampling plan
One-time sampling1 Type inspection shall be carried out in accordance with GB/T2829. The inspection items, non-conforming classification, discrimination level, sampling plan, and non-conforming quality level (RQL) are shown in Table 5.
Non-conforming classification
Inspection items
Small torque
Large torque
Torque change rate
Small torque decay rate
Fatigue life
V-shaped outer hook fastness
Corresponding clauses
Discrimination level
Sampling plan
Number of samples
Non-conforming classification
Inspection items
Inner hook fixing circle
Ring-shaped outer hook fixing circle
Spring tightening ruler Size
Symmetry of the center line of the end hole
Surface roughness
Surface treatment
Appearance quality
Straightness (applicable to straight delivery)
QB/T2311-1997
Table 5 (end)
Corresponding clauses
Discrimination level
Sampling plan Number of samples
6.2.2 The samples for type inspection shall be randomly selected from a batch or several batches that have passed the factory inspection, and the spare samples shall be determined by the inspection unit. 6.2.3 The judgment of passing and failing type inspection shall be carried out in accordance with the provisions of 4.11 of GB/T2829-1987. 6.2.4 The disposal after type inspection shall be carried out in accordance with the provisions of 4.12 of GB/T2829-1987. 6.2.5 The cycle of type inspection shall be determined by each production unit or negotiated by the supply and demand parties. However, type inspection should be conducted in any of the following cases.
a) Pre-production and identification of new products or old products for transfer to other factories; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) After normal production, periodic inspection should be conducted regularly or after a certain amount of production has been accumulated; d) When the product is resumed after a long period of suspension; e) When there is a significant difference between the factory inspection result and the last type inspection; f) When the national quality supervision agency proposes a type inspection requirement. 6.2.6 The sampling plan for type inspection can also be agreed upon by the inspection department and the manufacturer. 7 Marking, labeling, packaging, transportation and storage 7.1 Marking
The outer packaging box of the factory-made clockwork products should be marked with: a) Product name;
b) Product specifications;
c) Product quantity;
d) Manufacturer name;
e) Moisture-proof mark.
7.2 Label
Each box of spring products must have a product inspection certificate, which should contain the following information: a) manufacturer name, address, trademark,
b) production date;
c) standard number:
d) product name and specification;
e) inspector's signature;
f) product quantity;
-r KAON KAca-
g) precautions.
7.3 Packaging
QB/T 2311-- 1997
The surface of the spring should be coated with anti-rust oil, packed with moisture-proof paper or plastic bags, and then packed into packaging boxes. The packaging boxes should be moisture-proof and can ensure that the products will not be damaged due to packaging damage or breakage during long-distance transportation. 7.4 Transportation, storage
The product should be protected from rain and moisture during transportation, and the storage location must be dry. It is not allowed to be stored together with corroded items. 7.5 For users with special requirements for signs, labels and packaging, the supply and demand parties can negotiate separately. 451
Thickness and hardness
QB/T2311-1997
Appendix A
(Appendix of the standard)
Technical conditions for timer springs with hardness and thickness as the basis for evaluation See Table A1 for spring thickness accuracy and hardness. bzxZ.net
Thickness, mm
0. 08~ 0. 15
>0. 15 ~0. 25
>0. 25 ～0. 50
Ordinary precision (P)
Allowable deviation
Higher precision (H)
High sugar content (G)
According to the requirements of the purchaser, timing springs with dimensional accuracy and hardness other than those in Table A1 can be supplied after mutual agreement. Factory inspection
540~650
530~640
Factory inspection shall be carried out in accordance with the provisions of GB/T2828. The inspection items, inspection level (IL), acceptable quality level (AQL) and sampling plan are shown in Table A2.
Inspection items
Note: For factory hardness inspection, short-length materials from the same batch can be used instead. A4 Other items
Other dimensional accuracy and surface quality shall comply with the relevant provisions of the standard. 452
-r KAON KAca-
Sampling plan
One-time sampling1 Type inspection shall be carried out in accordance with GB/T2829. The inspection items, non-conforming classification, discrimination level, sampling plan, and non-conforming quality level (RQL) are shown in Table 5.
Non-conforming classification
Inspection items
Small torque
Large torque
Torque change rate
Small torque decay rate
Fatigue life
V-shaped outer hook fastness
Corresponding clauses
Discrimination level
Sampling plan
Number of samples
Non-conforming classification
Inspection items
Inner hook fixing circle
Ring-shaped outer hook fixing circle
Spring tightening ruler Size
Symmetry of the center line of the end hole
Surface roughness
Surface treatment
Appearance quality
Straightness (applicable to straight delivery)
QB/T2311-1997
Table 5 (end)
Corresponding clauses
Discrimination level
Sampling plan Number of samples
6.2.2 The samples for type inspection shall be randomly selected from a batch or several batches that have passed the factory inspection, and the spare samples shall be determined by the inspection unit. 6.2.3 The judgment of passing and failing type inspection shall be carried out in accordance with the provisions of 4.11 of GB/T2829-1987. 6.2.4 The disposal after type inspection shall be carried out in accordance with the provisions of 4.12 of GB/T2829-1987. 6.2.5 The cycle of type inspection shall be determined by each production unit or negotiated by the supply and demand parties. However, type inspection should be conducted in any of the following cases.
a) Pre-production and identification of new products or old products for transfer to other factories; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) After normal production, periodic inspection should be conducted regularly or after a certain amount of production has been accumulated; d) When the product is resumed after a long period of suspension; e) When there is a significant difference between the factory inspection result and the last type inspection; f) When the national quality supervision agency proposes a type inspection requirement. 6.2.6 The sampling plan for type inspection can also be agreed upon by the inspection department and the manufacturer. 7 Marking, labeling, packaging, transportation and storage 7.1 Marking
The outer packaging box of the factory-made clockwork products should be marked with: a) Product name;
b) Product specifications;
c) Product quantity;
d) Manufacturer name;
e) Moisture-proof mark.
7.2 Label
Each box of spring products must have a product inspection certificate, which should contain the following information: a) manufacturer name, address, trademark,
b) production date;
c) standard number:
d) product name and specification;
e) inspector's signature;
f) product quantity;
-r KAON KAca-
g) precautions.
7.3 Packaging
QB/T 2311-- 1997
The surface of the spring should be coated with anti-rust oil, packed with moisture-proof paper or plastic bags, and then packed into packaging boxes. The packaging boxes should be moisture-proof and can ensure that the products will not be damaged due to packaging damage or breakage during long-distance transportation. 7.4 Transportation, storage
The product should be protected from rain and moisture during transportation, and the storage location must be dry. It is not allowed to be stored together with corroded items. 7.5 For users with special requirements for signs, labels and packaging, the supply and demand parties can negotiate separately. 451
Thickness and hardness
QB/T2311-1997
Appendix A
(Appendix of the standard)
Technical conditions for timer springs with hardness and thickness as the basis for evaluation See Table A1 for spring thickness accuracy and hardness.
Thickness, mm
0. 08~ 0. 15
>0. 15 ~0. 25
>0. 25 ～0. 50
Ordinary precision (P)
Allowable deviation
Higher precision (H)
High sugar content (G)
According to the requirements of the purchaser, timing springs with dimensional accuracy and hardness other than those in Table A1 can be supplied after mutual agreement. Factory inspection
540~650
530~640
Factory inspection shall be carried out in accordance with the provisions of GB/T2828. The inspection items, inspection level (IL), acceptable quality level (AQL) and sampling plan are shown in Table A2.
Inspection items
Note: For factory hardness inspection, short-length materials from the same batch can be used instead. A4 Other items
Other dimensional accuracy and surface quality shall comply with the relevant provisions of the standard. 452
-r KAON KAca-
Sampling plan
One-time sampling50
Ordinary precision (P)
Allowable deviation
Higher precision (H)
High sugar content (G)
According to the requirements of the purchaser, timing springs with dimensional accuracy and hardness other than those in Table A1 can be supplied after agreement between the two parties. Factory inspection
540~650
530~640
Factory inspection shall be carried out in accordance with the provisions of GB/T2828. Its inspection items, inspection level (IL), acceptable quality level (AQL) and sampling plan are shown in Table A2.
Inspection items
Note: Factory hardness inspection can be replaced by short-length materials from the same batch. A4Other items
Other dimensional accuracy and surface quality shall be carried out in accordance with the relevant provisions of the standard. 452
-r KAON KAca-
Sampling plan
One-time sampling50
Ordinary precision (P)
Allowable deviation
Higher precision (H)
High sugar content (G)
According to the requirements of the purchaser, timing springs with dimensional accuracy and hardness other than those in Table A1 can be supplied after agreement between the two parties. Factory inspection
540~650
530~640
Factory inspection shall be carried out in accordance with the provisions of GB/T2828. Its inspection items, inspection level (IL), acceptable quality level (AQL) and sampling plan are shown in Table A2.
Inspection items
Note: Factory hardness inspection can be replaced by short-length materials from the same batch. A4Other items
Other dimensional accuracy and surface quality shall be carried out in accordance with the relevant provisions of the standard. 452
-r KAON KAca-
Sampling plan
One-time sampling
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.