This standard specifies the product specifications, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of hairsprings for mechanical clocks. This standard applies to hairsprings for mechanical clocks. QB/T 2273-1996 Hairspring for clocks QB/T2273-1996 Standard download decompression password: www.bzxz.net

QB/T2273—1996
This standard is revised based on the original professional standard ZBY11009-1986 "Balance for Clocks and Watches". During the revision process, there was no major change in the main technical content, only the acceptance test and type test were supplemented. The main differences between this standard and the original ZBY11009—1986 are: the writing format and expression method are in accordance with GB/T1.1--1993 Standardization Work Guide Unit 1: Drafting and Expression of Standards Part 1: Basic Regulations for Standard Writing" - the AQL value in the acceptance test is clarified:
- the specific content of the type test is added and the secondary sampling is changed to primary sampling. This standard is proposed by the Quality Standards Department of the China Light Industry Federation. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. The drafting unit of this standard: Shanghai Clock and Watch Component Factory No. 2. The main drafters of this standard: Zhong Shunzhi and Shen Hongping. From the date of implementation of this standard, the professional standard ZBY11009-1986 Clock hairspring issued by the former Ministry of Light Industry shall be invalid. 429
1 Scope
Light Industry Industry Standard of the People's Republic of China
QB/T 2273--1996
This standard specifies the product specifications, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of clock hairsprings. This standard applies to hairsprings for mechanical clocks.
2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, 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. Batch inspection counting sampling procedure and sampling table (applicable to the inspection of continuous batches) GB/T 2828-1987
Periodic inspection counting sampling procedure and sampling table (applicable to the inspection of the stability of the production process) GB/T2829-1987
GB/T1249-1991
Ordinary mechanical watches
3 Product specifications and dimensions
3.1 Hairspring components See Figure 1.
h--hairspring thickness; D inner pile outer diameter +d-inner pile hole diameter H-inner pile height Figure 1 Hairspring components diagram
3.2 Hairspring is made of constant elastic material, and its specifications and requirements are shown in Table 1. Approved by China Light Industry General Association from January 27, 1997
Implementation on September 1, 1997
Hairspring friction
3.3 The size parameters of the inner pile are shown in Table 2.
Inner pile hole diameter d
Basic dimensions
4 Technical requirements
Limit deviation
—0. 032
QB/T2273--1996
Table 1 Specifications and requirements of hairspring
Pitch deviation
Elastic elongation
Table 2 Dimensional parameters of inner pile
Inner pile outer diameter D
Basic dimensions
Limit deviation
The thickness, pitch and fixed length of the hairspring should comply with the provisions in Table 1. The elasticity of the hairspring should not be deformed after being elongated from the outermost end according to the length specified in Table 1 and returning. 4.2
The hole diameter, outer diameter and height of the hairspring inner pile should comply with the provisions in Table 2. 4.3
The surface roughness R of the hairspring should be 0.8 μm on the flat surface and 1.6 μm on the side surface. 4.4
4.5The temperature coefficient of the hairspring material should not be greater than 2 s/d·℃. Fixed length circle number deviation
Inner pile height H
Basic size
Limit deviation
4.6 Appearance quality
4.6.1 The appearance of the hairspring is silvery white, and no obvious discoloration is allowed. The inner pile key layer is not allowed to have blistering or peeling. 4.6.2 The inner surface of the hairspring is not allowed to have obvious deviation from the center of the inner pile hole, and the hairspring plane is not allowed to have obvious unevenness and tower shape: the hairspring plane is not allowed to have obvious deflection from the inner pile plane. 4.7 Other special requirements shall be agreed upon by the supply and demand parties. 431
5 Test method
5.1 Hairspring thickness
QB/T 2273-1996
Measure with a micrometer with a scale value of 0.001mm and an accuracy of Class 1. The hairspring pitch deviation is measured with a 50x projector, and the result should comply with the provisions of 4.1.
5.2 Measurement of fixed-length turns deviation
Fix the length on a fixed-length instrument with a standard balance wheel, and then measure with a sample. The result should comply with the provisions of 4.1. 5.3 Elastic elongation testbZxz.net
Fix the inner pile, clamp the outer end of the hairspring with pliers, and elongate it parallel to the plane of the inner pile and the winding direction of the hairspring. After elongating to the length specified in Table 1, release the tweezers, and visually inspect the hairspring after it is restored. The result should comply with the provisions of 42. 5.4 The inner height and outer diameter
are measured with a dry ruler with a scale value of 0.01mm and an accuracy of level 1; the aperture is measured with a plug gauge or a 50x projector, and the results should comply with the provisions of 4.3.
5.5 The surface roughness of the hairspring
is measured with a microscope, and three points are measured for each hairspring, and the average value is taken. The result should comply with the provisions of 4.4. 5.6 The temperature coefficient test of the hairspring material
is carried out in accordance with 5.6 of QB/T1249-1991, and the result should comply with the provisions of 4.5. 5.7 The appearance quality of the hairspring
is visually inspected at a distance of 300mm from the measured piece under a 40W fluorescent lamp, and the result should comply with the provisions of 4.6. 6 Inspection rules
6.1 Delivery inspection
6.1.1 Delivery inspection shall be carried out in accordance with GB/T2828. The unqualified categories, inspection items, inspection levels and qualified quality levels (AQL) are shown in Table 3.
Unqualified categories
Inspection items
Inner pile hole diameter
Pitch deviation
Fluctuation of fixed length of hairspring
Appearance quality
Elastic elongation
Inner pile height
Appearance quality
Applicable clauses
4.3, 5.4
4.6.2, 5.7
4.2, 5.3
4.6.1.5.7
6.1.2 The composition, batch size and sampling plan type of the batch shall be agreed upon by the supply and demand parties. Inspection Level
Acceptable Quality Level (AQL)
6.1.3 Inspection strictness shall be determined in accordance with 4.6 of GB/T2828--1987. 6.1.4 Based on the items determined in 6.1.1~6.1.3 above, the sampling plan shall be searched in accordance with the relevant provisions of 4.8 of GB/T2828--1987 to determine the sample size and judgment array.
6.1.5 The judgment of acceptance inspection pass and fail shall be carried out in accordance with 4.11 of GB/T2828--1987. 6.1.6 The disposal after acceptance inspection shall be carried out in accordance with 4.12 of GB/T2828--1987. 6.2 Type inspection
6.2.1 Type inspection shall be carried out in accordance with GB/T2829. The unqualified categories, inspection items, sampling plan, unqualified quality level (RQI.) and number of samples are shown in Table 4.
Unqualified
Inspection items
Inner pile hole diameter
Pitch deviation
Gossamer fixed length circle deviation
Gossamer material temperature coefficient
Appearance quality
Gossamer thickness
Elastic elongation
Inner pile height, outer diameter
Gossamer surface roughness
Appearance quality
QB/T2273-1996
Applicable clauses
4,1, 5.1
4.1, 5.2
4.6.2.5.7
4-2, 5.3
4.4, 5.5
4.6.1.5. 7
Discrimination
Sampling plan
First sampling
Unqualified quality
Level (RQL)
Number of samples
6.2.2 Samples for type inspection shall be randomly selected from a batch or batches that have passed the delivery inspection, and the spare samples shall be determined by the inspection unit. 6.2.3 The judgment of qualified and unqualified for 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 by negotiation between the supply and demand parties. However, type inspection shall be carried out in any of the following circumstances.
a) Trial and identification of new products or old products for transfer to factory production; b) After formal production, if there are major changes in structure, materials, and processes, which may affect product performance; c) During normal production, an inspection shall be carried out periodically or after accumulating a certain amount of production; d) When the product is resumed after a long period of suspension; e) When the factory inspection results are significantly different from the last type inspection; f) When the national quality supervision agency proposes to conduct type inspection. 6.2.6 The sampling plan for type inspection can also be agreed upon by the inspection department and the manufacturer. 7 Packaging, marking, transportation and storage
7.1 The hairspring packaging is layered with white paper and paper boxes. 7.2 Each package should have a product qualification stamp and indicate: a) manufacturer name or mark;
b) model and specification;
c) batch number and quantity;
d) inspector's stamp;
e) date of publication.
7.3 During transportation and storage, it is strictly forbidden to press heavy objects on the product. It must be handled with care to avoid damage, and moisture and corrosive substances should be prevented from invading. 433
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