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When grinding hardened steel crankshaft thrust face, may produce the following three kinds of burns
Update:2017-02-22 Tags:temperature

1. The temper burn

If the generator price

grinding zone temperature does not exceed the phase transition temperature of hardened steel, but exceeds the martensitic transformation temperature, thrust plane surface metal tempered martensite organization into a lower tempering hardness organization (sorbite or austenite), which burns called tempering burns.

2. The quenching burns

If the temperature exceeds the phase change temperature in the grinding zone, coupled with the cooling liquid quenching effect, the surface metal secondary hardening occurs, the surface of metal in the secondary quenching martensite structure, its hardness is higher than the original tempered martensite, in its lower, due to the slower cooling, the hardness is lower than the original tempered martensite tempered organization (sorbite or austenite), this burn is called hardening burns.

3. The annealing burns

If the grinding zone temperature than the phase transition temperature and the grinding area and no cooling fluid, metal surface will produce annealing organization, will be a sharp drop in surface hardness, burn this burn is called annealing. In form grinding crankshaft, belongs to the burn.

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