JB/T 6654-1993 Planar scroll spring technical conditions

This standard specifies the parameters and codes, types, technical requirements, test methods and inspection rules of plane scroll springs for general machinery. This standard applies to plane scroll springs with a spring material cross-section thickness of 0.2~4mm and a width of 3~50mm. This standard does not apply to springs with special requirements. JB/T 6654-1993 Technical conditions for plane scroll springs JB/T6654-1993 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Technical Conditions of Planar Scroll SpringwwW.bzxz.Net
Subject Content and Scope of Application
JB/T 6654-93
This standard specifies general machinery Parameters and codes, types, technical requirements, test methods, and inspection rules of flat scroll springs. This standard applies to flat scroll springs (hereinafter referred to as springs) with a cross-section thickness of 0.2 to 4 mm and a width of 3 to 50 mm.
This standard does not apply to springs with special requirements. Referenced standards
Method for determination of decarburized layer depth of steel
Metal Rockwell hardness test method
: Cold rolled cylindrical spiral torsion spring
Technical conditions
GB 1239.3
GB 1805
GB 2828
GB3525
GB3530||tt| |GB 8708
Spring terminology
Batch-by-batch inspection and counting sampling procedures and sampling tables (applicable to continuous batch inspection) Spring steel, tool steel cold-rolled steel strip
Heat-treated spring steel strip
Rising steel wire for automobile body accessories
3 Spring parameters, codes, and types
3.1 The parameters and codes of springs are as specified in Table 1. 3.2 The typical type of spring is shown in Figure 1 and Figure 2. Table 1
Parameter name
Spring outer radius
Spring inner radius
Spring outer diameter
Spring inner diameter
Generation||tt| |R
Parameter name approved by the Ministry of Machinery Industry of the People's Republic of China on 1993-05-07
Spring pitch
Hook radius
Material thickness
Material width
Generation
No.| |tt||mm
1994-01-01 Implementation
4 technical requirements
JB/T 6654-||tt ||Figure 1 Non-contact flat scroll spring
Figure 2 Contact flat scroll spring
4.1 The product should comply with the requirements of this standard and follow the product drawings and technology approved by the prescribed procedures Document manufacturing. 4.2 Materials
4.2.1 Spring...- should generally be made of the spring materials listed in Table 2, or can be made of other required materials agreed upon by both the supplier and the buyer. Table 2
Biaotan number
GB3530
GB 8708
G33525
Material name
Heat treated spring steel strip 1, 1, 1 Grade
Special-shaped steel wire for automobile body accessories
Spring steel, tool steel cold-rolled steel strip
65Mn.T7A.T8A.T9A .60Si2MnA.70Si2CrA65Mn.50CrVA
65Mn, 50CrA.60Si2Mn, 60si2MnA4.2.2 spring materials must have a quality inspection certificate from the material manufacturer. They must be re-inspected by the spring manufacturer before they can be used. 4.2.3 Material size series
Thickness size series is shown in Table 3.
Width ruler series are shown in Table 4.
8. 0||tt| |22
10||tt| |28
JB/T6654
Table 3
3. 5| |tt||Table 4
0.80|| tt||1.80
0.90|| tt||2.0
1.00|| tt||2.2
2.5|| tt||mm
The transition of each coil of the spring should be uniform, and no obvious unevenness is allowed. The pitch and hook tolerance of equal-pitch springs is specified in the drawing. 4.3
4.4 Each coil of the spring should be on the same spring outer diameter
flatness tolerance
plane perpendicular to the vortex center line , its flatness is specified in Table 5.
Table 5
50～100
≥100~200
4.5 Limit of number of non-contact spring coils The deviation shall be as specified in Table 6, and shall be subject to agreement between the supplier and the buyer when there are special requirements. 4.6 The limit deviation of spring outer diameter D. and inner diameter D is as specified in Table 7. Note: The outer radius or inner radius of the non-contact flat scroll spring is approximately calculated as the outer diameter or inner diameter according to the following formula for ease of measurement; D .-. 2R.. 0. 5t; D, -- 2R +0. 5t. The shape and size of the hook or small hole at the inner and outer ends of the spring and its limit deviation are specified in the drawing. 4.7
4.8 The limit deviation of the hook length of the spring hook is as specified in Table 8. Table 6
Cicada name
Non-contact flat scroll spring
Accuracy level
Extreme
Offset
Limited||tt ||Hook length
Degree
>10~ 30
>30
4.9 Heat treatment||tt| |Level 1 accuracy
extreme||tt| |Minimum ±0.5
Minimum ±0.3
Table 8
difference
>200
protocol
Level 2 accuracy
min ±0.7
min ±0.1
difference
mm|| tt||Ring
4.9.1 For heat-treated spring steel strips, stress relief annealing should generally be performed after forming, but stress relief annealing is not allowed according to the usage requirements. , 4.9.2 For springs made of annealed materials that need to be quenched and tempered, the number of quenchings shall not exceed 2 times, and the number of temperings is not limited. The hardness is 581
JB/T 6654--93|| The tt|| value is within the range of 400~504HV or 42~50HRC. 4.9.3 The metallographic structure of the quenched and tempered springs should comply with the relevant standards. 4.9.4 For springs that have been quenched and tempered, the depth of the single-sided decarburization layer is allowed to be increased by 0.25% of the material thickness to the decarburization depth specified in the raw material standard.
4.10 The surface of the spring should be smooth, with sharp chamfers or arcs on the sides, and no obvious burr defects are allowed. 4.11 The spring surface should be oxidized or otherwise anti-corrosion treated. 4.12 If there are other technical requirements for springs, they shall be stipulated by agreement between the supplier and the buyer. 5 Test method
5.1 Material cross-sectional size
Measure with a vernier caliper or dry ruler with a graduation value of 0.02mm. 5.2Flatness
Measure the maximum spring clearance using a grade 2 precision flat plate and feeler gauge. 5.3 Number of spring coils
Visual inspection or inspection with special tools.
5.4 Spring outer diameter and inner diameter
Use a vernier caliper with a graduation value of 0.02mm to measure the size equivalent to the outer diameter or inner diameter at the inner and outer rings of the spring 0.125 turns away from the end. 5.5 Other parameters Dimensions
are measured with a vernier caliper with a graduation value of 0.02mm, or can also be checked with special measuring tools. 5.6 Metallographic
Use products or test blocks for inspection, and the test method shall be in accordance with relevant regulations. 5.7 Hardness and decarburized layer depth
shall be inspected using products or test blocks, in accordance with the provisions of GB230 and GB224. 5.8 Spring oxidation treatment
Use 3% copper sulfate dripping on the product or 2% copper sulfate to soak. Within the specified time, visually check that the oxide film does not change color. 6 Inspection Rules
6.1 Inspection of various items of springs shall be carried out in accordance with the relevant provisions of this standard. Only after passing the inspection by the factory quality inspection department and accompanied by a product certificate can it be issued. 6.2 Spring-generally inspect the following items:|| tt||Key items: metallography, hardness, decarburization layer. Main items: inner and outer diameter, number of turns, flatness - general items: end aperture or hook shape, hook length, appearance, material thickness, material width. 6.3 When the ordering unit conducts sampling acceptance inspection of batch-produced springs, it shall be in accordance with the provisions of GB2828. Inspection levels and sampling plans are agreed between the supplier and the buyer.
7 Packaging, marking, transportation and storage
According to the provisions of Chapter 7 of GB1239.3.
Additional notes:
This standard is proposed and administered by the Machinery Standardization Research Institute of the Ministry of Machinery Industry. This standard is drafted by Shanghai Spring Research Institute. The main drafters of this standard are Ma Zhengting, Li Shuqin, Tong Yueming, and Ding Shou. 582
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