This regulation is applicable to the calibration of newly manufactured and used steel rulers. JJG 1-1999 Verification Regulation for Steel Rulers JJG1-1999 Standard download decompression password: www.bzxz.net
This regulation is applicable to the calibration of newly manufactured and used steel rulers.

National Metrology Verification Regulation of the People's Republic of China JG1--1999
Steel Rule
Issued on October 18, 1999
Implementation on March 15, 2000
Issued by the State Administration of Quality and Technical Supervision
Verification Regulation
of Steel Rule
JJG1—1999
J.JG1—1999
Replaces JJG1-1989
JJG397—1985
This regulation was approved by the State Administration of Quality and Technical Supervision on October 18, 1999, and came into effect on March 15, 2000.
Responsible unit: National Technical Committee for Geometry and Length Metrology Drafting unit: Tianjin Metrology Technology Institute This regulation entrusts the National Technical Committee for Geometry and Length Metrology to be responsible for the interpretation of this regulation Main drafters:
JJG1—1999
Liang Yiqing (Tianjin Metrology Technology Institute) Yin
(Tianjin Metrology Technology Institute)
(Tianjin Metrology Technology Institute)
1 Overview
2 Verification items and verification conditions:
3 Technical requirements and verification methods
Processing of verification results and verification cycle
JJG1-—1999
JJG1—1999
Verification regulation for steel rulers
This regulation applies to the verification of newly manufactured and in-use steel rulers. Overview
Steel rulers include ordinary steel rulers and cotton fiber steel rulers. They are measuring tools for measuring length and are made of stainless steel sheets. The ruler has lines engraved on both sides of the engraved surface. The nominal length of ordinary steel rulers is 150, 300, 500 (600), 1000, 1500, and 2000mm; the nominal length of cotton fiber steel ruler is 50mm. The square end of the ruler is the working end, and the other end is round with a hanging hole. The overall appearance diagram is shown in a and b of Figure 1. Increase the edge
2 Verification items and verification conditions
(0) Replace the steel ruler
(b) Cotton fiber steel ruler
Schematic diagram of steel ruler
Verification items and main verification tools are listed in Table 12.1
Overlapping hole
Verification items
Beijing surface flat steamed bun
The edge of the ruler, the self-line of the leg is
The straightness of the smooth edge and the healthy edge of the ruler
The thickness of the healthy edge
The half-quality of the intersection of the fraudulent edge and the movable edge
Line installation and width maintenance
Indicator error device
JJG1—1999
Main inspection tool
Surface relative measurement tutorial
1 level flat ruler, 1 level ruler
Radius is 0.5 half turn#||tt ||1 Love level: Grade enjoy fire
1 Install right angle people, 2 or level ruler only
1 Grade production, 1 Grade full ruler
Tools are sufficient
The reading quantity of m when the value is changed is said
Three single standard metal wire ruler: Reading teaching quantity single baking: Medium-sized special teaching indication makes me, "Guide indicates that it is not afraid of determining the inspection category
New manufacturing
In use
2.2 When the indoor temperature of the steel ruler indication error is inspected, the indoor temperature should be within the range of (20±5) C, and the inspected ruler and the inspection tool should be in the indoor temperature balance time for not less than 2h.
3 Technical requirements and inspection methods
3.1 Appearance
3.1.1 Requirements
3.1.1.1 The edge, side and back of the ruler should be smooth, and there should be no burrs, sharp edges and marks Phenomenon. The surface roughness of the above-mentioned parts of the cotton fiber steel ruler is R1.6m. 3.11.2 The scale surface and the blade plane of the ruler should not have magnetic damage, rust, obvious spots and scratches that affect the use. The surface roughness of the above-mentioned parts of the cotton fiber steel ruler is R≤0.8m. 31,1.3 The lines must be clear and vertical to the side, and there should be no visible broken lines. Half millimeter, millimeter, half centimeter, and meter lines should be represented by lines of different lengths. All lines of the same length should be of equal length. The steel ruler divisions should be counted from the end edge and marked with the corresponding numbers in centimeters. The unit of cm should be marked at the nominal full length.
3.1.1.4 The manufacturer's name (or trademark), MC logo, division value and number should be marked on the ruler. Numbers, text, and lines should be clear and arranged neatly without omissions. Newly manufactured rulers should comply with The above requirements allow the ruler in use to have appearance defects that do not affect the accuracy. 3.1.2 Verification method
Surface roughness is compared with the surface roughness comparison sample. If there is any doubt, it can be verified with the surface roughness measuring instrument. The other appearance items and the ruler in use are visually observed2
3.2 Flatness of ruler surface
3.2.1 Requirements
The flatness of the ruler surface should not exceed the provisions of Table 2. Check the ruler's slowness
Flatness
3.2.2 Verification method
JJG1-1999
150--500(600)
The ruler to be checked is placed flat on a level 1 flat ruler (or level 1 flat plate) of the corresponding specification, and the corresponding level 1 feeler gauge is used to calibrate within the full length of the ruler. If it passes, it is unqualified. 3.3 Elasticity
3.3.1 Requirements
When an ordinary steel ruler is bent into a circle with a radius of 250 mm, it should not produce plastic deformation after being released. 3.3.2 Verification method
The ruler surface is placed on the outer circle of a semicircular disk with a radius of 250 mm. After being released, it is verified according to the requirements and methods of ruler surface flatness in 3.2.
3.4 ​​Straightness of the end and side of the ruler
3.4.1 Requirements
The straightness of the end and side of the ruler should not exceed the requirements of Table 3. 3.4.2 Verification method
Attach the end and side of the ruler to the corresponding specification of Grade 1 flat ruler (or Grade 1 flat plate) respectively, and use the corresponding Grade 1 feeler gauge to calibrate within the full length of the inspected side. If it passes, the unqualified shall be installed. 3
Maximum inspected ruler length
S0DYG00
Straightness
Verticality
3.5 Verticality of the end and side of the ruler
3.5.1 Requirements
JJG1—1999
The verticality of the end based on the side shall not exceed the requirements of Table 3. 3.5.2 Verification method
Place the two sides of the ruler to be inspected on the corresponding specification of the second-level flat ruler in the direction where the scaled surface is perpendicular to the working surface of the flat ruler, and make the edge contact with the vertical edge of the first-level straight ruler placed on the flat ruler. Use the first-level feeler gauge to verify the upper or lower gap of the end of the ruler to be inspected. It should not exceed the requirements of Table 3. 3.6 Side thickness
3.6.1 Requirements
The side thickness of the cotton fiber steel ruler should be 0.2~0.3mm3.6.2 Verification method
Put the ruler flat on the first-level flat ruler (or first-level flat plate) (with the scaled surface facing downward), and use 0.2mm and 0.3mm first-level feeler gauges to verify by comparison method.
3.7 The radius of the arc at the intersection of the end and the side
3.7.1 Requirements
The radius of the newly manufactured cotton fiber steel ruler should not exceed 0.1mm; the radius of the ruler in use should not exceed 0.2mm. 3.7.2 Verification method
Visual observation. If in doubt, the verification can be carried out using the national arc eyepiece on the tool microscope. 3.8 Line width and width difference
3.8.1 Requirements
The line width and width difference should not exceed the provisions of Table 4. Table 4
Length of the ruler to be tested
50, 150
300~2000
3.8.2 Verification method
Line width
0.10~0.20
0.15--0.25
Verify with a reading microscope with a graduation value of 0.01mm. 3.9 Indication error
3.9.1 Requirements
Line width difference
The indication error of the total length and any line to the edge or end line of the ruler should not exceed the provisions of Table 5 and Table 6. 5
Nominal length
50, 150, 300
500(600)
Note: The indication error from the end of the ruler to the first case line is ±0.08mm4
JJG11999
3.9.2 For the steel ruler used as the standard for value transfer, the indication error between any lines should not exceed the provisions of Table 6. 6
Size range
>1~300
>300600
>600~1000
>1000~1500
>1500~200)
3.9.3 Verification method
Indication error from any line to the end edge or end line and between any lines ±0.10
For rulers with specifications below 1000mm, the full-length indication error is verified by placing the third-class standard metal line ruler① and the ruler to be verified on the main table 10 and the adjustable table 11 of the steel ruler verification table (the verification table is shown in Figure 2). Other workbenches that meet the verification requirements can also be used. Figure 2 Schematic diagram of steel ruler calibration platform
1 Spring: 2- Stop block: 3- Lifting rod: 4- Adjusting lifting nut: 5- Tightening screw; 6 Pot-shaped screw: 7- Stop block: 8- Zero adjustment rod: 9 Ruler positioning plate; 10 Main table; 11- Full table: 12- Leg bracket; 13 Spring In Figure 2, adjust the lifting nut 4 so that the marked surface of the ruler to be inspected and the edge of the standard ruler are on the same plane (the relative positions of the ruler to be inspected and the standard ruler are shown in Figure 3), and tighten the pot-shaped nut 6 to fix the upper and lower positions of the standard ruler and the ruler to be inspected. Adjust the ruler to be checked so that its line axis is parallel to the edge of the standard ruler, rotate the equal screw 8 to align the head or end line of the standard ruler with the end edge of the ruler to be checked, and use the magnifying glass attached to the standard ruler to read the error of the ruler to be checked on the standard ruler. For the calibration of 1500mm and 2000mm rulers, first remove the positioning plate 9 on the calibration platform, and then proceed as follows: 1500mm is divided into two sections of 1.000mm and 500mm, and 2.000mm is divided into two sections of 1000mm. ① When using the third-class standard metal wire effect ruler made of steel, the indoor temperature is within the range of (20 ± 2) C. S
JJG11999
section calibration, the total length error is the algebraic sum of the errors of the two sections. Standard rulerwwW.bzxz.Net
Figure 3 Relative position
Verification table
The verification of any line to the end edge or end line of the ruler is to compare the end edge or end line of the ruler to any line of the ruler with the corresponding length of the standard ruler. For steel rulers used for value transfer, the indication error between any lines is roughly evenly distributed in no less than 3 sections within its entire length and compared with the corresponding length of the standard ruler. If the ruler is over 1000mm, it can be divided into two sections and compared with the standard ruler. The error is the algebraic sum of the errors of the two sections. The indication error of the first half millimeter and millimeter divisions is verified by a reading microscope with a graduation value of 0.01mm.
The indication error of the lines on the upper and lower sides of the steel ruler scale surface should be verified, and the error should not exceed the provisions of 3.9.1 and 3.9.2.
The center of each line should be used as the standard for verification reading. The line spacing of the third-class standard gold-spreading line ruler should be used according to the actual size.
The indication error is also allowed to be verified by other methods that meet the accuracy requirements. Processing of verification results and verification cycle
4.1 A verification certificate shall be issued to the steel ruler that meets the requirements of this regulation or a qualified mark shall be affixed to the ruler, and the validity date shall be indicated. Rulers that do not meet the requirements of this regulation shall be scrapped. 4.2 The verification cycle of steel rulers in use can be determined according to specific circumstances, generally 1 year. 6
National Metrology Verification Code of the People's Republic of China
Steel Ruler
J3G1-1999
Promulgated by the State Administration of Metrology and Technology Supervision
Published by China Metrology Publishing House
No. 2, West Hepingli Street, Beijing
Postal Code 190013
Tel. 01064275360
htp:/zgjl.com.c m
Printed by Beijing Diyi Printing Company
Published by Xinhua Bookstore in Beijing
All rights reserved. No reproduction allowed
888mx1230m16-page
Printing sheet 0.75, number of pieces 9,000
1999 12-page 1st printing, 3rd printing in October 2005, number of copies 45015500
Tong No. 15 1558261085
Price: 12:00 yuan
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