JB/T 50147-2000 Measuring instruments Product quality grading Small torsion spring comparator JB/T50147-2000 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T50147-2000
Quality Grading of Measuring Tools and Instruments
Small Torsion Spring Comparator
(Internal Use)
Published on 2000-03-20
National Bureau of Machinery Industry
Implementation on 2000-06-01
JB/T50147—2000
This standard is formulated based on JB/T54247.1—1996 "General Rules for Quality Grading of Measuring Tools and Instruments", JB/T54247.2—1996 "Detailed Rules for Sampling and Acceptance of Quality Grading of Measuring Tools and Instruments" and JB/T3712-2—1998 "Small Torsion Spring Comparator". This standard is proposed and managed by the National Technical Committee for Standardization of Measuring Tools and Instruments. The responsible drafting unit of this standard is Chengdu Tool Research Institute. The main drafter of this standard is Chen Li.
1 Scope
Standards of the Machinery Industry of the People's Republic of China
Quality Grading of Measuring Instruments and Measuring Instruments
Small Torsion Spring Comparator
(Internal Use)
JB/T50147—2000
This standard specifies the quality indicators of qualified products, first-class products and superior products of small torsion spring comparators (hereinafter referred to as comparators) with a sleeve diameter of 8mm: the graduation value is 0.0002mm, the indication range is ±0.010mm; the graduation value is 0.0005mm, the indication range is ±0.025mm: the graduation value is 0.001mm, the indication range is ±0.05mm, the graduation value is 0.002mm, the indication range is ±0.1mm. This standard is applicable to the evaluation of the quality level of batch inspection and periodic inspection of comparators produced in batches. 2 Referenced standards
The clauses contained in the following standards constitute the clauses 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. JB/T37121998
JB/T54247.1—1996
JB/T54247.2—1996
3 Qualified products
Small torsion spring comparator
Quality classification of measuring tools and measuring instruments
Quality classification of measuring tools and measuring instruments The quality characteristics of qualified products do not meet the requirements specified in the acceptance standards and are classified as follows. 3.1 Class A unqualified
The indication error and indication variability of the comparator shall not be greater than the provisions of Table 1. Table 1
Division
3.2 Class B nonconformity Group I
±30 division
±0.00015
Indication error
3.2.1 The force measurement and force measurement change of the comparator shall not exceed the provisions of Table 2. ±50 division
3.2.2 The radial force indication change of the comparator shall not exceed the provisions of Table 3. Approved by the State Bureau of Machinery Industry on March 20, 2000 Indication variability
(division)
2000-06-01 Implementation
Division
Division
JB/T50147—2000
Radial force
The clearance between the pointer tip and the dial surface of the comparator shall not exceed 1mm. The spacing between the comparator scales shall not be less than 0.9mm. 3.2.4
Force change
Indication change
(division)
The comparator shall have a zero adjustment device with an adjustment range of not less than 5 divisions and a travel limiter to limit the stroke of the measuring rod. 3.2.6
The pointer swing time during measurement shall not exceed 1s. The difference between the tip width of the comparator pointer and the width of the scale mark shall not exceed 0.05mm. 3.2.7
3.3B Class Unqualified Group II
The comparator shall not have external defects that affect the performance, such as paint removal, chrome removal, scratches, bumps, rust, etc. 3.3.1
The movement of the comparator measuring mechanism shall be smooth and flexible, without sticking: in the free state, the pointer can return to the left scale line. 3.3.3
The diameter and deviation of the measuring rod sleeve are Φ8h7.
The balance of the pointer should not exceed 1/3 of the scale, where the scale value is 0.0002mm. The balance of the comparator pointer should not exceed 2/33.3.4
3.4 ​​Class B Unqualified Group II
3.4.1 The measuring head should be made of wear-resistant materials such as agate or cemented carbide; for steel measuring heads, the hardness of the measuring surface should not be less than 70HM (~62 HRC).
3.4.2 The maximum allowable value of the surface roughness R of the measuring head is 0.04μm. 3.5 Class C Unqualified
3.5.1 The external defects of the comparator are specified in Appendix B, Chapter B2 of JB/T54247.1-1996. 3.5.2 The width of the pointer tip and the scale mark of the comparator are 0.1~0.2mm. 3.5.3 The pointer tip of the comparator shall be located between 30% and 80% of the length of the short scale mark. There shall be a circular mark of no less than Φ1mm at a distance of 3 to 5mm from the pointer tip, and the mark and pointer tip shall be painted red, black or other eye-catching colors. 2
JB/T50147-2000
3.5.4 The marking and packaging of the comparator shall refer to the provisions of Chapter 7 of JB/T3712-1998 and Chapter B1 of Appendix B of JB/T54247.1-1996.
4 First-class products
The quality characteristics of first-class products do not meet the requirements specified in the acceptance standards and are classified as follows. 4.1 Class A non-conforming
shall comply with the provisions of 3.1.
4.2 Class B non-conforming group I
shall comply with the provisions of 3.2.1-3.2.7.
4.3B-type nonconforming group II
shall comply with the provisions of 3.3.1-3.3.4.
4.4B-type nonconforming group IIIII
shall comply with the provisions of 3.4.1~3.4.2.
4.5C-type nonconforming
shall comply with the provisions of 3.5.1~3.5.4.
4.6 Cleanliness
The inside and outside of the comparator shall be clean, and the cleanliness index of the unit product shall not exceed 9mg. 4.7 Life test
4.7.1 Test conditions
The test stroke is 80% of the indication range, and the test speed is 128 times/min. 4.7.2 Test requirements
After the comparator has been tested for 30x10 times according to the test conditions specified in 4.7.1, it shall still comply with the provisions of 3.1. 4.8 Main precision indicators of main parts
4.8.1 The uniformity of thickness of torsion spring wire shall reach 0.001mm. 4.8.2 The glass pointer shall not break when the radius of curvature is 15mm in the bending test. 5 Superior products
The quality characteristics of superior products do not meet the requirements specified in the acceptance standards and are classified as follows. 5.1 Class A unqualified
Should comply with the provisions of 3.1.
5.2 Class B unqualified group I
Should comply with the provisions of 3.2.1~3.2.7.
5.3 Class B unqualified group II
Should comply with the provisions of 3.3.1~3.3.4.
5.4 Class B unqualified group II
Should comply with the provisions of 3.4.1-3.4.2.
5C type non-conformance
Should comply with the provisions of 3.5.1-3.5.4.
5.6 Cleanliness
JB/T50147—2000
The inside and outside of the comparator should be clean, and the cleanliness index of the unit product should not be greater than 8mg. 5.7 Life test
5.7.1 Test conditions
The test stroke is 80% of the indication range, and the test speed is 128 times/min. 5.7.2 Test requirements
After the comparator has been tested for 50x10 times according to the test conditions specified in 4.7.1, it should still comply with the provisions of 5.1. 5.8 The main accuracy indicators of the main parts
Should comply with the provisions of 4.8.1~4.8.2.
Sampling inspection
6.1Batch inspection (before storage)
For large batches of comparator products stored in the warehouse, check the qualified quality level AQL value of each grade of products batch by batch. The sampling sample size, judgment array [AcRe] and sampling procedure should comply with the provisions of JB/T54247.2. 6.2 Periodic inspection (after storage)
6.2.1 The RQL value of the unqualified quality level is as specified in Table 4. Table 4
Grade products
Qualified products
First-class products
Superior products
Class A unqualified
Unqualified quality level ROL value
Class B unqualified group L
Class B unqualified group II I
Class B unqualified group IIII I
Class C unqualified
6.2.2 The sampling sample size and judgment group [Ac, Re adopted by the competent department of the enterprise or the product quality supervision and inspection agency are as specified in Table 5.
Grade products
Qualified products
First-class products
Superior products
Class A unqualified
16[0,1]
16[0,1]
20[0,1]
Sample size and decision array [4c, Re]
Class B unqualified group I
16[1,2]
20[1,2]
20[1,2]
Class B unqualified group IⅡI
162，3
202，3]
201，2]
Class B unqualified group III
3[0，1]
4[0,1]
5[0，1]
6.2.3 The sampling sample size and judgment array [Ac，Re] adopted by the enterprise quality supervision department are as specified in Table 6. 6.2.4 The sampling procedure shall comply with the provisions of JB/T54247.2. 4
Class C unqualified
6[9,10]
6[7,8]
6[5,6]
Grade products
Qualified products
First-class products
Superior products
Class A unqualified
20[0,1]
20[0，11
25[0,11
JB/T50147—2000
Sample size and judgment array[Ac , Re
Class B unqualified group
20[1,2]
25[1,21
25[1,2]
Class B unqualified group II
202，31
252，31
251,2]
Class B unqualified group IIII
4[0,1]
5r0,11
5[0,1]
Class C unqualified
6[4, 5]
Cleanliness index inspection samples are taken separately, and the sample size is 5: the operating process shall be in accordance with the provisions of Appendix C of JB/T54247.1-1996; the actual average value of the sample cleanliness shall not be greater than the provisions of 4.6 or 5.6. 6.4 Samples for life test are drawn separately, and the sample size and judgment array [Ac, Re] are: 3 [1, 2] for first-class products, 3 [0, 1] for superior products. The sampling meets the specified requirements and the test data is valid for 3 years. 6.5 Samples for main precision index inspection of main parts are drawn separately, and the sample size and judgment array [Ac, Re] are: 3 [1, 2] for first-class products, 3 [0, 1] for superior products.
Mechanical industry standards
Quality classification of measuring tools and instruments
Small torsion spring comparator
(for internal use)
JB/T50147—2000
Published and distributed by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, zip code 100044)*
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2000-037
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