This standard specifies the terms and definitions, types and basic parameters, requirements, inspection methods, marking and packaging of metal rulers. This standard applies to metal rulers with a graduation value of 1mm and a nominal length not greater than 2000mm. GB/T 9056-2004 Metal Ruler GB/T9056-2004 Standard download decompression password: www.bzxz.net

ICS 17. 040. 30
National Standard of the People's Republic of China
GB/T 9056--2004
Replaces GB/T9056-1988
Metal ruler
2004-02-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on August 1, 2004
GB/T9056--2004
This standard is a revision of GB/T9056-1988 "Steel ruler". This standard replaces GB/T9056-1988 "Steel ruler" from the date of its implementation.
Compared with GB/T9056-1988, the main changes of this standard are as follows: the standard name steel ruler is changed to metal ruler; normative reference documents are added (2 of this edition); the definition of "allowable error" is given (3.2 of this edition); the terminology of end edge and side edge is changed to end face and side face (2, 3 and Appendix A of 1988 edition; 4 to 6 of this edition); - the dimensions and markings of nominal length, width and thickness in the type drawing are changed (2 of 1988 edition; 4 of this edition); the verticality tolerance value of side face relative to end face is changed (3 of 1988 edition); .9; 5.5.1 of this edition); modified the straightness tolerance value of the side surface (3.10 of the 1988 edition; 5.5.2 of this edition); modified the specified value of the allowable error (3.11 of the 1988 edition; 5.6 of this edition); - the inspection method is no longer an appendix (Appendix A of the 1988 edition; 6 of this edition); deleted the figure in the verticality inspection method of the end face and the side surface (Appendix A5 of the 1988 edition; 6.2 of this edition); deleted the figure in the width difference (parallelism of the two side surfaces) inspection method (Appendix A4 of the 1988 edition; 6.5 of this edition). This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Measuring Tools and Instruments. This standard is drafted by Jingjiang Measuring Tools Co., Ltd. The main drafter of this standard: Yang Dongshun.
The previous versions of the standards replaced by this standard are: GB/T9056-1988.
1 Scope
Metal Rulers
GB/T 9056—2004
This standard specifies the terms and definitions, types and basic parameters, requirements, inspection methods, marking and packaging of metal rulers. This standard applies to metal rulers with a graduation value of 1mm and a nominal length not greater than 2000mm. 2 Normative References
The terms in the following documents become the terms of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions of these documents apply to this standard. GB/T17163—1997 Terminology of Geometric Measurement Instruments Basic Terms 3 Terms and Definitions
The terms and definitions established in GB/T17163-1997 and the following terms and definitions apply to this standard. 3.1
Metal rulermetalruler
A metal plate-shaped measuring instrument consisting of one or more sets of orderly scale marks and scale numbers. 3.2
Maximum permissible errorThe error limit value specified for metal rulers by technical specifications, rules, etc. 4 Types and basic parameters
4.1 The type of metal ruler is shown in Figure 1. The figure is for illustration only. End face
Scale face
aFAr G ANrAr AErE TnGaECO
4.2 The basic parameters of metal rulers should be as specified in Table 1. Hanging hole
Tail arc
GB/T 9056—2004
Nominal length 1
5 Requirements
5.1 Appearance
Total length L
Thickness B
Width H
15 or 20
Metal rulers should not have defects such as bumps, scratches, broken wires and paint peeling that affect their performance. 5.2 Materials
Metal rulers should be made of 1Cr18Ni9, 1Cr13 or other materials with similar properties. 5.3 Hardness and surface roughness
5.3.1 The hardness of metal rulers should not be less than 342HV. Deviation
Unit is mm
Aperture
±0.3 or ±0.4
5.3.2 The surface roughness Ra value of the scale face and back of the metal ruler shall not be greater than 0.8μm; the surface roughness Ra value of the side and end faces shall not be greater than 1.6μm.
5.4 Scale
5.4.1 There shall be one scale mark for every 10mm on the metal ruler, and the scale interval shall be 1mm. 5.4.2 The scale marks on the metal ruler shall be clear, and the width of the scale marks shall be between 0.10mm and 0.25mm. The maximum width difference between the scale marks shall not be greater than 0.04mm. 5.4.3 The scale marks of 0.5mm, 1mm, 5mm and 10mm on the metal ruler shall be marked with four distinguishable length scales of short, long, relatively long and longest.
5.4.4 A metal ruler with a nominal length of 150mm should be marked with 0.5mm scale marks on the length from 0mm to 50mm. 5.5 Main technical indicators
5.5.1 The verticality error of the end face of the metal ruler relative to the side face should not be greater than the provisions of Table 2. 5.5.2 The straightness error of the side and end faces of the metal ruler should not be greater than the provisions of Table 2. 5.5.3 When the metal ruler is bent to a radius of 250mm and released, the flatness error of its scale surface should not be greater than the provisions of Table 2.
5.5.4 The parallelism error between the two sides of the metal ruler should not be greater than the provisions of Table 2. 5.6 Allowable error
The allowable error of the metal ruler should not be greater than the provisions of Table 3. 2
Nominal length 1
Perpendicularity
Nominal length!
Straightness
Note: The allowable error value is calculated as ±(0.10+0.05×1/500), and the unit of 1 is mm. 6 Inspection method
6.1 Ruler
Flatness
Allowable error
GB/T 9056—2004
Unit is mm
Parallelism
Unit is mm
Use a tool microscope or a reading microscope with a magnification of 20 times (resolution of 0.01mm) to detect the width of the ruler mark and the maximum width difference between the ruler marks. 6.2 Verticality error
Place a metal ruler on a flat plate (grade 2), fit a square ruler to the side or end face of the metal ruler, and then use a feeler gauge (grade 2) with a nominal size equal to the verticality tolerance value (see Table 2) for inspection. 6.3 Straightness error
Place the side (end face) of the metal ruler on the flat plate (grade 2) and use a feeler gauge (grade 2) with a nominal size equal to the straightness tolerance value (see Table 2) for detection.
6.4 Flatness error
Bend the metal ruler to a radius of 250mm and release it, then fit the scale surface to the flat plate (grade 2) and use a feeler gauge (grade 2) with a nominal size equal to the flatness tolerance value (see Table 2) for detection. 6.5 Width difference
Use a vernier caliper with a reading value of 0.02mm to detect over the entire length of the metal ruler. 6.6 Allowable error
6.6.1 On a special calibration table, place the two scale sides of a metal ruler with a nominal length less than or equal to 1000mm and a standard ruler (3rd grade standard metal wire ruler) flatly, and use a reading microscope (resolution of 0.01mm) to read the difference between the metal ruler and the standard ruler as shown in Figure 2, which is the indication error of the metal ruler. GB/T9056—2004
6.6.2 A metal ruler with a nominal length of 1500mm is tested in sections from 0mm to 500mm and from 500mm to 1500mm using the above method. The algebraic sum of the differences between the two sections is the indication error of the metal ruler. 6.6.3 The metal ruler with a nominal length of 2000mm is tested in sections from 0mm to 1000mm and from 1000mm to 2000mm using the above method. The algebraic sum of the difference between the two sections is the indication error of the metal ruler. Screw
7 Marking and packaging
7.1 The metal ruler should at least be marked with:
a) manufacturer's name or registered trademark;
b) graduation value;
c) nominal length.
7.2 The packaging box of metal rulers shall be marked with at least: a) manufacturer’s name or registered trademark; bzxZ.net
b) product name;
c) nominal length.
Reading microscope
Standard ruler
Calibration table
Metal ruler
7.3 Metal rulers shall be treated with rust prevention and properly packaged before packaging. The product shall not be damaged during transportation due to poor packaging. 7.4 Metal rulers that have been verified to meet the requirements of this standard shall be accompanied by a product certificate, which shall be marked with the standard number, product serial number and factory date of this standard.
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