Do you know the purpose of induction hardening of mechanical parts?
1. Improve the wear resistance of the surface of the part
Induction hardening is initially applied to the surface of the crankshaft. The purpose is to improve the wear resistance of the journal. Before this, the crankshaft was tempered, and induction hardening greatly improved the wear resistance of the crankshaft.
2. Improve the fatigue strength of parts
Further application of induction hardening is to improve the fatigue strength of quenching parts, such as automobile axles. Taking the EQ1092 automobile axle as an example, under the ±3000N•M torsional load, the fatigue test is 2 million times, still intact, and the original quenching and tempering process The fatigue life of the half shaft is less than 300,000 times. For example, the original process of the knuckle ball head pin is 18CrMnTi steel carburizing and quenching, and then the 45 steel induction hardening is used. The bending fatigue life of the parts is increased from 80,000 times to 2 million times. the above. The induction hardening of the crankshaft fillet doubles the fatigue strength of the crankshaft, and the fatigue strength of the crankshaft of some products reaches ≥700 MPa.