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GB/T 2493-1995 English PDF (GBT2493-1995)

GB/T 2493-1995 English PDF (GBT2493-1995)

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GB/T 2493-1995: Rotation test of grinding wheel strength

This standard specifies the rotation test method of the grinding wheel strength. This standard applies to grinding wheels with various bonding agents and other abrasive tools that need to be subject to rotation test.
GB/T 2493-1995
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.100.70
J 43
Rotation test of grinding wheel strength
ISSUED ON: DECEMBER 01, 1995
IMPLEMENTED ON: AUGUST 01, 1996
Issued by: State Bureau of Technical Supervision
Table of Contents
1 Scope ... 3
2 Test equipment ... 3
3 Test conditions and methods ... 3
Appendix A Chuck and partition for rotation test (Supplementary) ... 6 Additional information: ... 8
Rotation test of grinding wheel strength
1 Scope
This standard specifies the rotation test method of the grinding wheel strength. This standard applies to grinding wheels with various bonding agents and other abrasive tools that need to be subject to rotation test.
2 Test equipment
2.1 The rotation test is carried out on a special rotation testing machine according to the diameter, quality and maximum working speed of the grinding wheel.
2.2 The spindle speed error of the rotation testing machine shall not be more than 3%.
2.3 The radial runout of the main shaft of the rotation testing machine is not more than 0.07 mm. The measurement location is the middle of the mandrel. 2.4 The rotation test machine shall be equipped with a time relay, to ensure that when the spindle speed reaches the test speed, the speed will be reduced after maintaining a specified period of time.
2.5 The noise level of the rotation testing machine shall not exceed 85 dB(A) at no load.
2.6 The protective cover of the rotation testing machine shall be firm and safe. 2.7 The rotation testing machine shall be inspected regularly.
3 Test conditions and methods
3.1 The rotation test shall be carried out according to the following method at the maximum working speed as marked on the grinding wheel.
For grinding wheels with a maximum working speed of less than or equal to 50 m/s, the rotation test is performed at 1.6 times the maximum working speed; after reaching to the maximum speed, it is maintained for 30 s.
For grinding wheels with a maximum working speed greater than 50 m/s, the rotation test is performed at 1.5 times the maximum working speed; after reaching to the maximum speed, it is maintained for 30 s.
Note: If there are other provisions for the rotation test method in the product standard, the product standard shall be implemented.
3.2 It is allowed to install multiple grinding wheels on the main shaft of the rotation testing machine at the same time; different grinding wheels shall be separated by a partition. The outer diameter of the partition and the width of the pressing surface are the same as the chuck.
3.3 The grinding wheel as installed on the main shaft of the rotation testing machine shall be fastened by chucks at both ends.
3.4 When the hole diameter of the grinding wheel is larger than the outer diameter of the main shaft of the testing machine, a shaft sleeve is allowed. 3.5 Grinding wheel chuck
3.5.1 The shape and dimensions of the grinding wheel chuck and the partition are as shown in Appendix A (Supplementary).
3.5.2 For the grinding wheel whose outer diameter and the diameter are not listed in Appendix A (Supplementary), the outer diameter of the chuck shall conform to formula (1)
Where:
Df - Outer diameter of chuck, mm;
D - Outer diameter of grinding wheel, mm;
H - Aperture of grinding wheel, mm.
3.5.3 The outer diameter of the cymbal-shaped grinding wheel chuck shall conform to formula (2); the other dimensions shall be in accordance with Appendix A, Table A1.
Where:
Df - Outer diameter of chuck, mm;
D1 - The inner bottom diameter of grinding wheel, mm.

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