JB/T 50146-2000 Measuring tools and instruments Product quality classification Spring-loaded internal micrometer JB/T50146-2000 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T50146-2000
Quality Grading of Measuring Tools and Instruments
Spring-loaded Internal Diameter Peripheral Indicator
(Internal Use)
Published on 2000-03-20
National Bureau of Machinery Industry
Implementation on 2000-06-01
JB/T50146—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/T8791-1998 "Spring-loaded Internal Diameter Peripheral Indicator". 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 Liu Yuling.
1 Scope
Standards of the Machinery Industry of the People's Republic of China
Quality Grading of Measuring Instruments and Measuring Instruments
Spring-type Internal Diameter Dial Indicator
(Internal Use)
JB/T50146—2000
This standard specifies the quality indicators of qualified products, first-class products, and superior products of spring-type internal diameter dial indicators (hereinafter referred to as internal diameter indicators) with a graduation value of 0.01mm and a measuring range of 3~20mm. This standard is applicable to the assessment of the quality level of batch inspection and periodic inspection of batch-produced internal diameter indicators. 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 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/T8791—1998
JB/T54247.1—1996
JB/T54247.2—1996
3Qualified products
Spring-type internal diameter micrometer
General rules for quality classification of measuring tools and measuring instruments
Qualified products do not meet the requirements specified in the acceptance standards and are classified as follows. 3.1Class A unqualified
The total indication error, adjacent error and indication variability of the internal diameter gauge shall not be greater than the provisions of Table 1. Table 1
Probe range
3.2Class B unqualified group I
Total indication error
The measuring force of the internal diameter gauge shall not be greater than the provisions of Table 2. Measuring range mm
Measuring force N
Approved by the State Bureau of Machinery Industry on 2000-03-203-4
Adjacent error
Variability of indication
>10~20
Implemented on 2000-06-01
3.3 Class B non-conformity Group IⅡ
JB/T50146—2000
3.3.1 The inner diameter gauge shall not have obvious cracks, scratches, bumps, rust and other external defects that affect the performance. 3.3.2 Under normal use, the measuring mechanism should move smoothly and flexibly without sticking or loosening. 3.3.3 The maximum allowable value of the surface roughness R of the measuring surface of the spring probe is 0.10um. 3.3.4 The gap between the tip of the pointer and the surface of the dial shall not exceed 0.7mm. 3.4 Class B non-conformity Group I
The hardness of the measuring surface of the expansion spring probe shall not be less than 766HV (~62HRC), and the hardness of the measuring surface of the expansion spring probe made of stainless steel shall not be less than 551HV (52.5HRC).
3.5 Class C non-conformity
3.5.1 The external defects of the internal diameter gauge refer to the provisions of Chapter B2 of Appendix B in JB/T54247.1-1996. 3.5.2 The marking and packaging of the internal diameter gauge refer to Chapter 7 of JB/T8791-1998 and Chapter B1 of Appendix B in JB/T54247.1-1996.
The measuring range of the internal diameter gauge, the pre-travel from the compression probe to the starting point of the probe range, the probe range and the measuring hole depth are shown in Table 3. Table 3
Measuring range
Pre-travel (min)
Probe range (min)
Drilling depth (min)
3.5.4 The scale mark width of the dial gauge shall be 0.10-0.20mm. >4-10
>10-20
3.5.5 The pointer tip width of the dial gauge shall not be greater than 20% of the scale spacing and shall be as consistent as possible with the scale mark width. 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
The total error of the indication, the adjacent error and the variability of the indication of the internal diameter gauge shall not be greater than the provisions of Table 4. Table 4
Probe range
Class B non-conforming group I
shall comply with the provisions of 3.2.
4.3B-type nonconformity IⅡI group
shall comply with the provisions of 3.3.1-3.3.4.
Total error of indication
Adjacent error
Variability of indication
4.4B-type nonconformity II group
shall comply with the provisions of 3.4.
4.5C-type nonconformity
shall comply with the provisions of 3.5.1-3.5.5.
4.6 Cleanliness
JB/T50146—2000
The inner and outer surfaces of the inner diameter gauge shall be clean, and the cleanliness index of the unit product shall not exceed 9mg. 5 Superior products
The quality characteristics of superior products do not meet the requirements specified in the acceptance standards and are classified as follows. 5.1The total error, adjacent error and variability of the indication of the A-type nonconforming internal diameter gauge shall not be greater than the provisions of Table 5. Table 5
Probe range
B-type nonconforming group I
shall comply with the provisions of 3.2.
5.3B-type nonconforming group II
shall comply with the provisions of 3.3.1-3.3.4.
5.4B-type nonconforming group II
shall comply with the provisions of 3.4.
5.5C-type nonconforming
shall comply with the provisions of 3.5.1~3.5.5.
5.6Cleanliness
Total error of indication
Adjacent error
The internal and external surfaces of the internal diameter gauge shall be clean, and the cleanliness index of the unit product shall not exceed 7mg. 6 Sampling inspection
6.1 Batch inspection (before storage)
Variability of indication
For large batches of internal diameter gauge products stored in storage, the qualified quality level AQL value of each grade of products shall be inspected batch by batch. The sampling sample size, judgment array [AcRe| and sampling procedure shall comply with the provisions of JB/T54247.2. 6.2 Periodic inspection (after storage)
6.2.1 The unqualified quality level RQL value is as specified in Table 6. 6.2.2 The sampling sample size and judgment array [4c, Re adopted by the competent department of the enterprise or the product quality supervision and inspection agency are as specified in Table 7. 3
Grade products
Qualified products
First-class products
Superior products
Grade products
Qualified products
Market-grade products
Superior products
Class A unqualified
Class A unqualified
16[0,1]
16[0,1]
20[0,1]
JB/T50146—2 000
ROL value of unqualified quality level
Class B unqualified group
Class B unqualified group IⅡ
Class B unqualified group III
Sample size and judgment array [Ac, Re]
Class B unqualified group I
16[1,2]
20[1,2]
20[1,2]
Class B unqualified group II I||tt| |162,31
20[2,3]
201,21
Class B unqualified group IⅢI
3[0,1]
4[0,1]
5[0,1]
The sampling sample size and judgment array [Ac, Re] adopted by the enterprise quality supervision department are as specified in Table 8.6.2.3
Grade products
Qualified products||tt ||First-class products
Superior products
Class A nonconforming
20[0,1]
25[0,1]
Sample size and judgment group[4cRe]
Class B nonconforming group I
20[1,2]
25[1,2]
25[1,2]
6.2.4 The sampling procedure shall comply with JB/T54247.2. Class B unqualified group II
202，31
252，31
251，2]
Class B unqualified group IⅢI
4[0,1]
5[0，11
5[0,1]
Class C unqualified
Class C unqualified
6[9，10
6[7,8]
6[5,6]
Class C unqualified
6[8,9]
6.3 Cleanliness index inspection samples are drawn separately, and the sample size is 5: The operating process is in accordance with the provisions of Appendix C of JB/T54247.1-1996: The actual average value of sample cleanliness shall not be greater than 4.6 or 5.6 as specified in 4
Mechanical industry standard| |tt||Quality classification of measuring tools and instruments
Spring-loaded internal diameter micrometerwwW.bzxz.Net
(for internal use)
JB/T50146-2000
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing, zip code 100044)*
1/16 sheet 1/2
Format 880×1230
First edition in June 2000
Print count 1-500
2 word count 1Q000
First printing in June 2000
Price 1000 yuan
2000-036
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn00090
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