GB/T 2490-2018Bonded abrasive products—Hardness grade measurement (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 2490-2007 "hardened abrasive hardness test", compared with GB/T 2490-2007 main technical changes as follows.

--- Added normative references (see Chapter 2);

---Modified the expression of nozzle to abrasive surface distance, pressure gauge accuracy grade and quartz sand chamber volume (see 3.1.1.5~3.1.1.7, 2007 version 2.1.1.5~2.1.1.7);

--- Revised the expression of the test sieve requirements in the quartz sand particle size (see 3.1.2.3, 2007 version 2.1.2.3);

--- Revised the name and thickness requirements of the calibration glass (see 3.1.3, 2007. 2.1.3.1);

--- Increased the requirements for the triangular end face of the blasting hardness machine support head and the surface seal of the abrasive tool in working conditions (see 3.2.3);

--- Revised the order of the correction clause for the sandblasting hardness machine (see 3.2.4, 2007 version 2.1.3.2);

--- Increased the specification of the blasting hardness abrasive tool, the grinding wheel (35, 36, 37 type) inspection work surface regulations, the diameter of the abrasive tool is greater than When the specification of the measurement site is 1000mm and the thickness of the abrasive tool is greater than 400mm, the specification of the same production process can be made (see Table 1, Table 1 of the 2007 edition);

--- Revised the relevant requirements in the blasting hardness test operation (see 3.3.2, 2007 version 2.3.2);

--- Added a description of the special requirements for sandblasting hardness (see 3.4.4);

--- Increased the requirements for Rockwell hardness testers (see 4.1);

--- Revised the name of the load in Rockwell hardness working conditions (see Table 3, Table 3 of the 2007 edition);

--- Increased the time for the application of test force (see Table 3, Table 3 of the 2007 edition);

--- Increased the requirements for the same block of production process in the Rockwell hardness measurement site (see 4.3.1.5);

--- Revised the relevant requirements in the Rockwell hardness test operation (see 4.3.2, 2007 version 3.2.2);

--- Added a description of the special requirements for Rockwell hardness (see 4.4.4).

1 Scope

This standard specifies the method for testing the hardness of abrasive tools by sandblasting hardness machine and the method for testing the hardness of abrasive tools by Rockwell hardness tester.

This standard applies to ceramic binders and resin binder bonded abrasives with abrasive grain size F36~F1200.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 230.2 Rockwell hardness test for metallic materials - Part 2. Hardness testers (A, B, C, D, E, F, G, H, K, N, T scales) Inspection and calibration

3 Sandblasting hardness machine to test the hardness of abrasive tools