GB/T 2493-2023Test method for rotating strength of abrasive products (English PDF)

Foreword

This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.

This Document replaced GB/T 2493-2013 Rotation Test of Grinding Wheel Strength. Compared with GB/T 2493-2013, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications.

a) Change the Scope (see Clause 1 of this Clause; Clause 1 of 2013 Edition);

b) Add the provision that the raising speed of the rotary test machine shall be uniform (see 4.1.2 of this Edition);

c) Change the relative error range of the spindle speed of the rotary test machine (see 4.1.3 of this Edition; 3.2 of the 2013 Edition);

d) Change the requirements for the radial runout of the spindle of the rotary test machine (see 4.1.4 of this Edition; 3.3 of the 2013 Edition);

e) Add the requirements for recording or displaying the spindle speed of the rotary test machine (see 4.1.6 of this Edition);

f) Change the requirements for the tensile strength of the chuck and partition materials and the sleeve materials (see 4.2.1, 5.2 of this Edition; 4.4, 5.3 of the 2013 Edition);

g) Change the provision for the installation and clamping of the rotating test of the abrasive products (see 5.1 of this Edition; 5.2 of the 2013 Edition);

h) Add the provision for the installation and clamping of the rotating test of abrasive products with special installation methods (see 5.4 of this Edition);

i) Change the setting method of the rotating test parameters (see 6.1 of this Edition; 5.1 and 6.1 of the 2013 Edition);

j) Add the steps of idling during the rotating test (see 6.2 of this Edition);

k) Add the method for handling the breakage of the abrasive products during the rotating test (see 6.6 of this Edition);

l) Add the provision for test report (see Clause 7 of this Edition).

Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents.

1 Scope

This Document specifies the test equipment, test requirements, test methods and test reports for the inspection of the rotating strength of abrasive tools.

This Document is applicable to the inspection of the rotating strength of bonded abrasive tools, coated abrasive tools and super-hard abrasive material products.

2 Normative References

The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.

GB 2494 Bonded abrasive products - Safety requirements

GB/T 16458 Terminology for abrasives and abrasive products

GB/T 43134 Super-abrasive products - Safety requirements

GB/T 43323 Coated abrasives - General safety requirements

3 Terms and Definitions

For the purposes of this Document, the terms and definitions given in GB/T 16458 apply.

4 Testing Equipment

5 Test Requirements

5.1 The abrasives (except for the grinding heads with handles and the flap wheels with shafts) installed on the main shaft of the rotary test machine shall be fastened with chucks at both ends; the grinding heads with handles and the flap wheels with shafts shall be fastened with collets;

5.2 When the hole diameter of the abrasive tool is larger than the outer diameter of the main shaft of the rotary test machine, sleeve shall be allowed to use; and the tensile strength of the sleeve material shall be no less than 415N/mm².

5.3 During the safety speed test, it is allowed to install multiple abrasives on the main shaft of the rotary test machine at the same time.

5.4 When taking rotating test for the abrasives with a special installation method, it shall be installed according to the installation method when it is used.

6 Test Methods

6.1 Turn on the power switch of the rotary test machine; and set the rotating strength test parameters (test speed, retention time when the test speed is reached) according to the provisions of GB 2494, GB/T 43134, GB/T 43323 or the provisions of relevant product standards.

6.2 Lock the hood of the rotary test machine; start the rotary test machine to idle;

6.3 Install the abrasive tool on the main shaft of the rotary test machine according to the provisions of Clause 5.

6.4 Lock the hood of the rotary test machine and start the rotary test machine.

6.5 After the rotary test machine stops rotating, open the hood of the rotary test machine and remove the abrasive tool.

7 Test Report

The test report shall at least give the following contents. […]

Appendix A (Informative) Chucks and Partitions for Rotating Test of Bonded Abrasive Tools

A.1 The shapes and dimensions of the chuck and partition for grinding wheels with shape code 1 are shown in Figure A.1 and Table A.1, respectively. Figure A.2 and Table A.2 provide another design of the chuck.

A.2 For grinding wheels with shape code 1 whose outer diameter and aperture size are not listed in Tables A.1 and A.2, the outer diameter of the chuck shall comply with Formula (A.1); and other dimensions shall refer to the dimension values of chucks with the same outer diameter in Table A.1.

Appendix B (Informative) Chucks and Partitions for Rotating Test of Coated Abrasive Tools

B.1 The shapes and dimensions of the chucks and partitions for the flap wheels, flap discs, and vulcanized fiber discs (Type A2, Type B2, Type C2) with or without chucks are shown in Figure B.1 and Table B.1 respectively. Figure B.2 and Table B.2 provide another design of the chuck.

NOTE: For the model of vulcanized fiber discs, see GB/T 20963.

Appendix C (Informative) Chucks and Partitions for Rotating Test of Super-abrasive products

C.1 The shapes and dimensions of the chucks and partitions for peripheral grinding wheels (including continuous diamond edging wheels) and diamond circular saw blades with base code 1 are shown in Figure C.1 and Table C.1, respectively. Figure C.2 and Table C.2 provide another design of the chuck. […]