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Verification Regulation of the People's Republic of China for Metrology JJG 37—2005
Sine Bars
Promulgated on September 5, 2005
Implementation on March 5, 2006
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG37—2005
Verification Regulation of
Sine Bars
JJG 37—2005
JJG371992
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on September 5, 2005, and came into effect on March 5, 2006. Responsible units:
Main drafting unit:
Participating drafting unit:
National Technical Committee for Geometry and Angle Metrology Henan Institute of Metrology
Chengliang Tools Co., Ltd.
This regulation is entrusted to the National Technical Committee for Geometry and Angle Metrology to be responsible for the interpretation of this regulation. Main drafters:
Ge Weisan
Jia Xiaojie
Zhang Weidong
Participating drafters:
Niu Shuzhi||tt ||JJG372005
(Henan Institute of Metrology)
(Henan Institute of Metrology)
(Henan Institute of Metrology)
(Chengliang Tools Co., Ltd.)
References
Metrological performance requirements
Surface roughness of measuring surface
Flatness of main working surface
JJIG 37—2005
Parallelism of the main working surface and the common tangent plane of the cylinder generatrixParallelism of the two column axes
Deviation of the center distance of the two cylinders
Angular deviation of the sine gauge when it is 30°
General technical requirements
6 Control of measuring instruments
6.1 Verification conditions
Verification items
6.3 Verification methods
6.4 Processing of verification results
6.5 Verification cycle
Format of verification certificate and verification result notice (inside page) (1)
1 Scope
JJG37—2005
Verification procedure for sine gauge
This procedure is applicable to the initial verification, subsequent verification and in-use inspection of sine gauges with accuracy grades 0 and 1.
References
This specification refers to the following documents:
JB/T7973—1999
JF1059—1999
JJF 1001-1998
JJF 1094—2002
《Sine Rule》
《Evaluation and Expression of Uncertainty in Measurement》
《General Metrology Terms and Definitions》
《Evaluation of Characteristics of Measuring Instruments》
When using this specification, attention should be paid to using the current valid versions of the above referenced documents. 3 Overview
The sine rule is a measuring instrument that uses the principle of stop chord and generates angles with the help of gauge blocks. It is mainly used to measure the angle of workpieces and the chain length of circular chains. It is divided into 0 and 1 grades, and has two structural types: pull type (see Figure 1) and wide type (see Figure 2).
Figure 1 Narrow stop gauge
1-screw; 2-front plate: 3-main body; 4-cut baffle: 5-surface 4 Metrological performance requirements
Surface roughness of measuring surface
The maximum allowable reading error requirements are shown in Table 1.
4.2 Flatness of loading working surface
JJG 37-2005
Figure 2 Wide sine gauge
1-screw: 2-front baffle: 3-main body: 4-side baffle: 5-net Maximum allowable error requirements are shown in Table!
4.3 The maximum allowable error requirements of the travel between the main working surface and the common tangent surface of the cylindrical generatrix are shown in Table 1.
Table 1 Metrological performance requirements
Verification item name
Surface roughness of measuring surface
Surface roughness of main working surface
Type, width
(μrm)
Parallelism of the main working surface and the common tangent plane of the cylindrical
line||(μun)
Parallelism of the two circular axes
Deviation of the center distance of the two cylinders
Angle|||Deviation when the sine rule is 30° (\)
1: Main working surface: R.0.08
2. Cylinder surface: R,0.04
L = 200mm
3. Working surface of front baffle and side baffle: R, 1.252
No convexity allowed in the middle
Total length#
4.4 Parallelism of the two cylinder axes
Maximum allowable error requirements are shown in Table 1.
4.5 Deviation of the center distance of the two cylinders
Maximum allowable error requirements are shown in Table 1,
4.6 Deviation of the angle value when the sine gauge is 30°
Maximum allowable error requirements are shown in Table 1.
5 General technical requirements
5.1 Appearance
JJG 37—2005
5.1.1 There should be no rust, dents, scratches and burrs on the working surfaces of the sine gauge. 5.1.2 The sine gauge should be marked with the manufacturer's [or factory mark], (mark, specifications and factory number. 5.2 Magnetism
The sine gauge should be non-magnetic.
The sine gauge in use and after repair is allowed to have the above-mentioned defects that do not affect the measurement accuracy. 6 Control of measuring instruments
The control of measuring instruments includes initial calibration, subsequent calibration and in-use inspection. 6.1 Calibration conditions
6.1.1 Environmental conditions
6.1.1.1 The temperature of the laboratory is (20±1)℃, and the temperature change per hour should not exceed 1℃. 6.1.1.2 Before calibration, the sine gauge should be placed in the room for not less than 1 hour, or placed in a normal room for not less than 3 hours. 6.1.2 Main calibration instruments and their technical requirements See Table 2 for the main calibration instruments and their technical requirements. Table 2 Main verification instruments and their technical requirements Instrument name
Surface roughness ratio proofing block
Knife-edge straight edge
Micrometer
Horizontal optical meter
Angle block
6.2 Verification items
Verification items of sine gauge See Table 3.
0-grade sine gauge
Technical requirements
Grade sine gauge
Indication error: +12% -17%
The indication error should not be greater than 0.3m
The indication error should not be greater than 0.20gm
Indication error: +12%~-17%bzxZ.net
The indication error should not be greater than 0.5m
The indication error should not be less than 0.20m
Calibration items
Surface roughness of measuring surface
Flatness of main working surface
JJG 37—2005
Parallelism of the working surface of the body and the common tangent plane of the generatrix of the two cylindersParallelism of the axes of the two cylinders
Deviation of the center distance of the two cylinders
Deviation of the angle value when the sine rule is 3(F
First calibration
Activity: "+" in the table indicates the items to be inspected, "-" indicates that the items do not need to be inspected.
6.3 Verification method
6.3.1 Appearance
Monthly observation.
6.3.3 Surface roughness
Use the surface roughness comparison sample block to verify by comparison method. 6.3.4 Flatness of the left body working surface
Subsequent verification
In use Inspection
Use a grade 0 knife-edge ruler whose size is not less than the diagonal length of the main working surface, and measure with the light gap method at no less than four positions on the inspected working surface (as shown in Figure 3), and take the maximum value as the verification result. y
Figure 3 Schematic diagram of the measurement position of the flatness of the main working surface 6.3.5
1 When verifying the parallelism of the working surface and the common tangent plane of the two cylindrical generatrixes, place the sine rule on the flat plate, so that the micrometer fastened to the universal meter stand is in contact with the main working surface, and the contact point is about 4mm away from the edge of the working surface. Move the sine rule and measure according to the four arms A, B, C, and D as shown in Figure 4. The difference between the maximum and minimum values measured by the micrometer is the verification result. 6.3.6 Parallelism of the two cylindrical auxiliary lines
The parallelism should be measured in two measurement directions parallel and perpendicular to the main working surface. First, as shown in Figure 5,4
JG 37—200S
Figure 4 Schematic diagram of the measurement position of the parallelism between the main working surface and the common tangent plane of the two column generatrixes A
Figure 5 Schematic diagram of the measurement position of the parallelism of the two cylindrical axes Using a horizontal optical gauge, measure the reading value D. at the position of the A-A surface of the cylindrical fine line, and then measure a reading value D. at the position of the B surface. The difference between D. and is the parallelism of the two cylindrical axes parallel to the main working surface.
Then place the main working surface of the stop gauge downward on the [0 level (see Figure 6), and use a micrometer with a square table stand to measure the height deviation between the highest points of the two circles at the cross-sectional positions of A-A and B-B respectively, taking the height generatrix of a cylinder as the reference. The difference between the two height deviations is the parallelism of the two cylindrical axes in the direction perpendicular to the main working surface. The maximum value of the parallelism of the two cylindrical axes in both directions is the calibration result. +B
Figure 6 Schematic diagram of the measuring position for the parallelism of the two circular knitting machine axes 5
6.3.7 Deviation of the center distance between the two cylinders
JJG 37—2005
6.3.7. Use a horizontal optical gauge and a gauge block to verify the diameters of the two cylinders by comparison method. During the calibration, place the sine gauge on the horizontal optical gauge as the table, and measure the middle section of the two columns (i.e., the C-center section shown in Example 5) to obtain the surface diameter of circle 1 and the cross-sectional diameter dcc of column 2.6.3.7.2 Place the sine gauge on the horizontal optical gauge as shown in Figure 5, and use the optical gauge and the gauge block to measure the C-C section position in Figure 5 by comparison method, and then compare it with the diameter of the two cylinders at the CC section position dic, d2c- and substitute it into formula (1) to obtain the center distance of the sine gauge. The difference between this value and the nominal size is the calibration result = L = De -
In the formula:
dic + dou
1x—actual value of the center distance of a sine gauge, mm; D——the distance between the two outer sides of the two round supports at the CC surface, mm; drc, dz—diameters of the two cylinders at the C-C section, mme6.3.8 Angular deviation when the sine gauge is 302 (1)
6.3,8,1 The angular deviation when the 0-level sine gauge is 30 is measured on a ()-level flat plate. When measuring, first use a micrometer to measure the values of A, 2 and b on the main working surface as shown in Figure 7. Then use the gauge block and the sine gauge to form an angle of 30, place the 3 special angle block on the stop sine gauge and close to the two baffles, and then use the micrometer to measure the values of A and B at both ends of the angle block, and h,. Then, place the block on the flat plate in place, and repeat the above method on the other end of the sine gauge to measure a, 3, and b respectively. Calculate the calibration result according to formula (2). (b,-a) = (bo - a) (b.- a.) - (bu- a,) + 4iAa = artcsin
Where: △α—-angle deviation of the stop gauge, (\); 2H
[—the distance between the micrometer at points A and B (should be not less than 66mm), mm: Ai—angle deviation of the standard angle, (\). (2)
6.3.8.21-level sine gauge device when the angle deviation is measured at 30°, first use the gauge block on the board to form an angle of 30° with the sine gauge (as shown in Figure 7), place the angle block on the working surface of the sine gauge soil, and close to the two baffles, then use the micrometer head of the micrometer fastened to the multimeter stand to contact the angle fast working surface, and read the readings a and b of points B respectively, and calculate the calibration result according to formula (3). ba
Aa=aresin
In Chinese: A—angular deviation of a chord gauge, (\): a, b—the readings of the micrometer at points A and B, μm, respectively; 1—the distance between the micrometer at points A and B (should be no less than 66mm), mm; A—angular deviation of a standard angle, (\) 6.4 Processing of verification results
For the qualified normal gauges verified according to the requirements specified in the regulations, a verification certificate shall be issued, and the accuracy grade shall be indicated; for the unqualified ones, a verification result notice shall be issued, and the unqualified items shall be indicated. 6.5 Verification period
The verification period of the normal gauge shall be determined according to the usage, usually 1 year. 6
JJG 37-—2005
Figure 7 Schematic diagram of angle deviation measurement
1 Flat plate: 2—Front baffle; 3—Angle: 4—Prediction instrument: 5—Side baffle: 6—Sine rule body: 7—Circle Du+8—Measurement decision 7
JJG 37—2005
Verification certificate and verification result notice (internal) format () Verification certificate internal page format
Verification items
Surface roughness of measuring working surface
Flatness of soil working surface
Parallelism of soil working surface and common tangent plane of two cylinder lower generatrix
Parallelism of two cylinder axes
Deviation of two cylinder center distance
: Angle value difference when sine rule is 30
() Verification result notice internal format unit
Verification result
Verification result notice 3 The following content should be indicated on the internal page: The date and volume data of the unqualified items verified in accordance with this regulation. 85 Verification cycle
The verification cycle of the sine gauge is determined according to the usage, generally 1 year. 6
JJG 37-—2005
Figure 7 Schematic diagram of angle deviation measurement
1 Flat plate: 2—Front baffle; 3—Angle: 4—Prediction instrument: 5—Side baffle: 6—Sine gauge body: 7—Circle Du+8—Measurement decision 7
JJG 37—2005
Verification certificate and verification result notice (internal) format () Verification certificate internal page format
Verification items
Surface roughness of measuring working surface
Flatness of soil working surface
Parallelism of soil working surface and common tangent plane of two cylinder lower generatrix
Parallelism of two cylinder axes
Deviation of two cylinder center distance
: Angle value difference when sine rule is 30
() Verification result notice internal format unit
Verification result
Verification result notice 3 The following content should be indicated on the internal page: The date and volume data of the unqualified items verified in accordance with this regulation. 85 Verification cycle
The verification cycle of the sine gauge is determined according to the usage, generally 1 year. 6
JJG 37-—2005
Figure 7 Schematic diagram of angle deviation measurement
1 Flat plate: 2—Front baffle; 3—Angle: 4—Predictor: 5—Side baffle: 6—Sine gauge body: 7—Circle Du+8—Measurement decision 7
JJG 37—2005
Verification certificate and verification result notice (internal) format () Verification certificate internal page format
Verification items
Surface roughness of measuring working surface
Flatness of soil working surface
Parallelism of soil working surface and common tangent plane of two cylinder lower generatrix
Parallelism of two cylinder axes
Deviation of two cylinder center distance
: Angle value difference when sine rule is 30
() Verification result notice internal format unit
Verification result
Verification result notice 3 The following content should be indicated on the internal page: The date and volume data of the unqualified items verified in accordance with this regulation. 8
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