This regulation is applicable to the initial calibration, subsequent calibration and in-use inspection of the internal micrometer with a graduation value of 0.01mm, a micrometer head indication range of 13mm, 25mm, 50mm, and a measuring range of (50-6000)mm. JJG 22-2003 Verification Regulation for Internal Micrometers JJG22-2003 Standard Download Unzip Password: www.bzxz.net
This regulation is applicable to the initial calibration, subsequent calibration and in-use inspection of the internal micrometer with a graduation value of 0.01mm, a micrometer head indication range of 13mm, 25mm, 50mm, and a measuring range of (50-6000)mm.

Verification Regulation of Internal Diameter in Minutes of the People's Republic of China JJG 22-2003
Issued on 2003-03-05
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Implemented on 200309-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJG 22-2(N03
Verification Regulation of Internal Diameter in Minutes of the People's Republic of China JJG 22-2(N03
Verification Regulation of Internal Diameter in Minutes of the People's Republic of China Micrometers
JJG22--2003
Replaces JJG22-1991
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on March 5, 2003, and came into force on September 1, 2003.
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Main drafting units: Xilongjiang Province Measurement Verification and Testing Institute Harbin Electric Machinery Co., Ltd.
Harbin Metrology Verification and Testing Institute
Committee
This regulation is entrusted to the National Technical Committee for Process Parameters and Metrology for interpretation --
The main drafter of this regulation:
Chu Yunku
..IG22—2003
(Heilongjiang Metrology Verification and Testing Institute)
(Harbin Electric Motor Factory Co., Ltd.) (Harbin Metrology Verification and Testing Institute)
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Scope·
References··
Overview·
4 Performance requirements -
Radius of curvature of the working surface of the measuring head
Surface roughness of the working surface
Line width and width difference
JJG 22—2003
Distance from the edge of the differential cone to the scaled surface of the fixed sleeve4.4
Relative position of the end face of the differential cone and the millimeter scale of the fixed sleeve4.6
Combined dimensions of the micrometer head and the extension rod
4.8 Rigidity·
Caliper gauge for calibration
5 General technical requirements·
5.1 Appearance·*.
5.2 Interaction between various parts
6 Measuring instruments Digging
6.1 Verification conditions.
6.2 Verification items..
6.3 Verification method·
7 Verification result processing
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8 Verification cycle·
Appendix A Examples of the combination of micrometer head and extension rod Appendix B Uncertainty evaluation of measurement results of indication error of internal diameter micrometer Appendix C Format of the inner pages of verification certificate and verification result notification (1)
（3）
1 Scope
JJG 22—2003
Verification Procedure for Internal Micrometer
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of internal micrometers with a graduation value of 0.01mm, a micrometer head indication range of 13mm, 25mm, 50mm, and a measurement range of (50~6000)mm. 2 References
This procedure refers to the following documents:
JJF 1001-1998 General Measurement Terms and Definitions JJF1059—1999 Evaluation and Expression of Uncertainty in Measurement GB/T 8177-1987 Internal Micrometer
When using this procedure, attention should be paid to the use of the current valid versions of the above-mentioned references. 3 Overview
The main features of internal micrometers!
As shown in Figure 1.
4 Metrological performance requirements
Engraved measuring head
4.1 The radius of curvature of the working surface of the measuring base head
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The radius of curvature of the working surface of the fixed sleeve back micrometer head
The radius of curvature of the working surface of the inside micrometer measuring head should not exceed 40% of the lower limit of the inside micrometer measuring head. 4.2 Working surface roughness
The roughness of the working surface of the two measuring heads shall not exceed R.0.2um for the first calibration and inspection during use, and shall not exceed K.0.4mm for subsequent calibration; the surface roughness of the two end surfaces of the inner salt rod of each extension rod shall not exceed R.0.2um; the surface roughness of the working surface of the caliper used for calibration shall not exceed R.0.05uml for the first calibration and inspection during use, and shall not exceed R.0.1jumo
4.3 Width of scale lines and width difference
For the fixed sleeve diameter of the differential For sleeves with a diameter not exceeding 16 mm, the width of the longitudinal scale line on the fixed sleeve and the scale line on the differential sleeve shall be (0.100.20) mm, and the difference in scale line width shall not exceed 0.03 mm; for sleeves with a diameter greater than 16 mm, the width of the longitudinal scale line on the fixed sleeve and the scale line on the differential sleeve shall be (0.15~0.25) mm, and the difference in scale line width shall not exceed 0.oSrm.
4.4 The distance from the edge of the differential sleeve cone to the fixed tube scale line and the distance from the edge of the differential sleeve cone to the fixed tube scale line surface shall not exceed 0.4mn. 4.5 The end of the differential cone and the millimeter scale of the fixed sleeve should be in the same position. When the measurement lower limit is adjusted correctly, the zero scale of the differential cone is aligned with the longitudinal scale of the fixed sleeve, and the end face of the differential cone and the edge of the fixed sleeve scale should be tangent: if not tangent, the pressure line should not exceed 0.05mm, and the offline should not exceed 0.1mm.
4.6 The indication error of the micrometer head and the indication change when the locking device is locked and loosened The indication error of the micrometer head should not exceed ±6mml for sizes up to 125rtml, and should not exceed ±8zm for sizes greater than 125mm; when the micrometer head locking device is fixed and loosened, the indication change caused should not exceed 2m, and the indication error is within the allowable range.
4.7 The combined size of the micrometer head and the extension rod
The indication error range of the combined size of the micrometer head and the extension rod should not exceed the provisions of Table 1. CAD
Civil micrometer standard
2 125 200
25200325
/325=500
> 500 - 800
800 ~1250
1250 ~ 1600
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> 4000 ~ 5000
> s000 ~ 6oi
Indication error
.0.060
For the internal diameter micrometer with the upper limit of measurement greater than 1250ml, when the support point is at 200mm from the end face and the support point is at 2/9 of the length of the internal diameter micrometer from the end face, the difference in the two measurements shall not exceed the provisions of Table 2.
Table 2 Rigidity requirements
Dimension range
>1250 ~1600
> 1600 ~ 2000
> 2000 ~ 2500
250)-3150
Dimension change section
Dimension range
>3150～4000
> 4000 ~5000
>5000 ~6000
Dimension change range
JJG 22—2003
4.9 The working dimension deviation of the caliper gauge used for calibration and the parallelism of the two working surfaces The working dimension deviation of the caliper gauge used for calibration and the parallelism of the two working surfaces shall not exceed the provisions of Table 3. Table 3 Working dimension deviation and parallelism of two working surfaces of calibrators used for calibration Working dimension
50 and 75
5 General technical requirements
5.1 Appearance
Working dimension deviation
Parallelism
5,1,1 The inside diameter micrometer and the calibrators used for calibration for the first time shall not have appearance defects such as dents, rust, coating peeling, etc., and the scale lines shall be clear
5.1.2 Appearance defects on inside diameter micrometer
5.1.3 Subsequent calibration and use

5.1.4 Internal diameter micrometer measurement
5.1.5 Internal diameter micrometer must
5.2 Interactions between the various parts
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5.2.1 The micrometer must be flexible, stable, without sticking and friction when it rotates back and forth within the entire working stroke, without radial swing and axial movement that can be felt by hand, and the micrometer head feed mechanism should function reliably. 5.2.2 Each extension rod should be flexible to load and unload, and the connection should be reliable without shaking that can be felt by hand. The measuring rod in the extension rod should have good contact and be flexible to move.
6 Recording instrument control
Recording instrument control includes initial calibration, subsequent calibration and in-use inspection. 6.1 Calibration conditions
6.1.1 Environmental conditions
The room temperature for calibrating the inner diameter scale and the time for the inner diameter scale to be tested to be placed in the room for equilibrium temperature before calibration shall comply with the provisions of Table 4.
When the inner diameter scale to be tested and the caliper gauge used for calibration are placed in the room for equilibrium temperature of the metal plate, the equilibrium temperature time shall not be less than half of the value specified in Element 4. 6.2 Calibration equipment
Main calibration instruments See Table 5
6.2 Calibration items
Preliminary calibration items
Dimensions of inside micrometer
Range/mm
50~800
> 800 ~ 1600
> 1600 ~ 3150
>3150~6000
JJG 22-—2003
Table 4 Verify the allowable deviation of the internal diameter in the micrometer room and the indoor equilibrium temperature time of the internal temperature to 20℃℃
Inside micrometer
Calibration calliper
The equilibrium temperature time shall not be
less than (h)
Table 5 List of verification items and main verification instrumentsVerification item
Function of each part
Measuring head working surface white
Working surface surface roughness
Grade line width and width difference
Main verification instruments
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+ 12% ~ - 17%
Tool microscope
Differential cone edge to fixed sleeve engraving! Level 2 feeler gauge deviation, not exceeding the distance between the line and the surface
The relative position of the end face of the cone of the differential tube and the scale line beside the determination sleeve
(±16um) or tool microscope
Chaochang machine indication error: decimeter scale
The indication error of the micrometer head and the locking device scale (0.5+1/100)m; millimeter scale The indication change when locking and releasing
Scale (0.6+L/200)μm: micrometer
Scale 0.2 5m
Combined size of micrometer and extension
Caliper working size and parallelism of two working
Note; "+"
in the table means that it should be calibrated,
length measuring machine
length measuring machine
horizontal optical gauge indication error:
inaccuracy is
0.25mm, fourth-class block
improvement value: (0.20+2z)m
means that it is not necessary to calibrate.
Temperature change during calibration
Certification category
In use
6.3 Verification method
6.3.1 Appearance
Observation.
6.3.2 Interaction between each part
Observation and test.
6.3.3 Radius of curvature of the working surface of the measuring head
JJG22—2003
The measuring head of the internal micrometer is calibrated with a radius template, or it can be measured by comparing with a standard arc on a tool microscope or a projector.
6.3.4 Surface roughness of the working surface
Calibrated with a surface roughness comparison sample.
6.3.5 Width of scale lines and width difference
Calibrated on a tool microscope. At least three scale lines are evenly distributed on the differential cylinder and the fixed sleeve. The difference in scale line width is determined by the difference between the maximum and minimum values. 6.3.6 The distance from the edge of the cone surface of the differential cylinder to the scale line surface of the fixed sleeve is calibrated on a tool microscope. It can also be calibrated by comparison method with a 2nd grade feeler gauge with a thickness of 0.4mm. When checking, the right edge of the inner diameter scale line should be scratched on the differential cone. 6.3.8 Micrometer head indication The displacement between the end face of the micrometer head indication and any millimeter scratch line of the fixed sleeve is the distance, pressure and penalty. If it does not exceed 25mm, the inspection points should be evenly distributed at 5 points; for the indication range of 50mm, the inspection points should be evenly distributed at 10 points. The dimensions of the inspection points of the micrometer head are listed in Table 6.
Table 6 Inspection points of micrometer head
Indication range of micrometer head
Size of inspection point
Note: A indicates the lower limit of the certification.
A + 10.50
A + 13.00www.bzxz.net
A + 10.25
A + 20.50
A + 25.00
A + 10.12
A + 15.00
A + 20.25
A + 25. 00
A + 30.37
A + 35.00
1 + 40.50
During calibration, first install a flat measuring cap with a diameter of not less than $8mm on the measuring rods of the headstock and tailstock of the length measuring machine, and adjust the working edges of the two measuring caps to be parallel.
The micrometer to be inspected is placed directly or with the aid of a support on the instrument workbench, and then the measuring lower limit of the micrometer is adjusted to the correct value according to the indication of the instrument, and then the inspection point size listed in Table 6 is calibrated. The indication verification of the micrometer is carried out under the conditions of fixed and loose differential cylinders. JJG 22—2003
The indication error of each point is determined by the difference between the indication of each point of the micrometer and the value measured on the instrument. The indication change is determined by the difference between the values ​​measured at the same inspection point under the conditions of fixed and loose differential cylinders. 6.3.9 Combined size of micrometer and extension rod
The combined size of micrometer and extension rod is calibrated on the length measuring machine. First, align the micrometer with the measuring lower limit, then lock the micrometer and assemble them separately, and then combine the micrometer with all the extension rods. Then select the groups of scales that are evenly distributed in the inner room of the combined scale. These three groups of scales must have the largest number of extension rods, and the extension rod size deviation is relatively prominent. For the dimension greater than 200mm, the distance between the support point and the end face should be 2/9 of the combined dimension. During the verification, each group of dimensions must verify the inner diameter every 902 revolutions of the scale without its indication error exceeding the requirements of Table 1. The indication error of the combined dimension is determined by the difference between the combined dimension and the value measured by the instrument. For example: the nominal value of the tested combined dimension is 300mm, and the measured value is 300.010mm, then the indication error of the combined dimension
e = 300 - 300.010 = - 0.010 (mm)6.3.10 Rigidity
On the length measuring machine, the
point is located at a distance of
from the end face. The distance between the support point and the end face
should not exceed the requirements of Table 2.
6.3.11 Calibration card table
On the horizontal optical meter
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On the length measuring machine, make the two supports
90° and calibrate once. Then, the difference of the corresponding dimensions in the verification of the support
, the dimensions of the 5 points on the working surface of the
caliper gauge (as shown in
Figure 2) are successively combined with the four equal blocks and the pad block accessories to form the internal dimensions for verification by comparison method. The dimension of the center of the working surface is the working dimension of the caliper gauge; the difference between the maximum and minimum values ​​of the 5-point dimensions on the working surface is the parallelism of the two working surfaces. The working surface is allowed to have an edge 0.5mm away from the edge. The working dimensions and parallelism of the calibration caliper gauge can also be verified by other instruments of corresponding accuracy (if there is a dispute that requires arbitration, it should be verified on a horizontal optical meter). e
Verification result processing
JJG 22—2003
The internal diameter dry micrometer that meets the requirements of this regulation after verification will be issued a verification certificate; if it does not meet the requirements of this regulation, a verification failure notice will be issued, and the unqualified items will be indicated. Calibration cycle
The calibration cycle of the internal micrometer can be determined according to the actual use, generally not more than 1 year. CAO
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Appendix A
.JJG 22—2003
Examples of combinations of micrometers and extension rods Examples of combinations of micrometers and extension rods are as follows: Measuring range is (100~900) rirl Inside diameter scale: The lower limit of measurement A of the micrometer is (100~125)rrrm Extension rod:
Dimensions of micrometer and each extension rod:
Micrometer and all extension rods
Micrometer and some extension rods
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A+5+3+2+1
A+4+3+2+1
A+3+2+1
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