This standard specifies the method for testing the hardness of abrasive tools with Rockwell hardness tester. This standard is applicable to common abrasive tools with vitrified bond and resin bond with abrasive grain size of F100 to F1200. GB/T 2491-2003 Method for testing the hardness of common abrasive tools with Rockwell hardness tester GB/T2491-2003 Standard download decompression password: www.bzxz.net

This standard replaces GR/72491-1984. This standard is mainly different from GB/T2491-1984 in that it adds the following specifications: - Added the range of tool hardness difference and uniformity; - Added the Rockwell hardness test conditions for abrasive sample sizes F103~F15D; - Added the provisions for the determination of the Rockwell hardness of abrasives; - Added the requirements for the uniformity of the hardness of abrasives; - Added the Rockwell hardness A~E of abrasives; - Added the plastic difference and the tolerance value of the part in the comparison table for determining the tool hardness grade from the measured value. This standard was proposed by China Machinery Industry Federation; - This standard was issued by China Abrasives Standardization Technical Committee (SAC/TC139); - This standard was drafted by Zhengzhou Abrasives and Grinding Research Institute. The main drafters of this standard are Chen Wenping and Liu Mei 、苗清、强长伍、This standard was first issued in 1981 and first revised in 1981. CB/T2491—2003
1 Scope
Method for testing hardness of abrasive tools with Rockwell hardness tester This standard specifies the method for testing hardness of abrasive tools with Rockwell hardness tester B/T2491—2003
This standard is applicable to common tools with ceramic binder and resin binder whose abrasive particles are from F10 to F120C: 2 Rockwell hardness test method
2.1 Scope of hardness tester working parts shall be in accordance with the provisions of Table 1. Table 1 Rockwell hardness tester working parts
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Negative number/
2.2 Other Rockwell hardness test parts
Steel diameter/m.
F18-~F500
Ball diameter/ uu
Fhk-F12uu
2.2.1 Abrasive stone and sand tile: measure one point symmetrically at the position of L/5 on the center line of the long virtual square. 2.2.2 Cup, sulfur-shaped grinding wheel: measure four points symmetrically at 1/3 of the outer surface (or outer cone surface) and the end face of the ring. 2.2.3 Phosphorus-shaped grinding wheel: measure four points perpendicularly at 1/2 of the inner surface or at the end face of the ring. 2.2.4 Other grinding wheels: The perimeter is 1/2 of the distance from the hole (or distance), and the measurement is made at each of the above two points. The average value of the points with similar values ​​is the hardness value at that location. 2.3 The hardness measurement operation shall comply with the following provisions: 2.3.1 The time for the rope punch to descend without load shall be adjusted within 5-6. The upper diameter of the steel ball can be m
2.3.2 The surface of the flat grid is oxygen-free and the wide-track grinding tool is processed, so on the inspection table of the impact gauge, the rise T. Workbench. Add 8N preload to the standard, adjust the quarter point and the pointer of the indicator to be equal: add the main load after ignition, wait until the total load is completely added, do not hold for a long time, remove the main load and then connect the B scale on the scale to read the number, 3. Determination of Rockwell hammer of grinding ear
3. The hardness value, tolerance range, grade difference and property difference of grinding ear shall be in accordance with Table 2 and Table 3. 3.2 The property of grinding ear hardness shall not be different from that of grinding ear. 3.3 After the hardness uniformity of the abrasive tool meets the established standards, the arithmetic mean of the hardness values ​​at each location is taken. It is accurate to the unit. If the average value is within the allowable range specified in the standard, it is considered qualified. The hardness value, hardness allowable range and uniformity tolerance value shown in Table 2A of GB/T2491-2003 are 43-55. ~E7
E9-~75
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