Impact test of coal mill gear

Cut and process the inspection gear along the axial direction and about 1/4 diameter into U-type impact test specimen, and carry out impact test at room temperature according to national standard.

The standard requirements of impact absorbent power of 42CrMo steel in national standard GB/T3077-2015 alloy structural steel are listed in the test results.

It can be seen from the test results that the impact absorbent power of the sun wheel with intermediate shaft sent for inspection is lower than the standard requirement of 42CrMo steel in the national standard of China, and the impact performance does not meet the basic requirements, which also means that the gear tooth surface does not meet the specified hardness requirements.

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