The crank neck induced quenching has the following four quenching processes:
1. The crankshaft is not rotated, and the opening and joint sensor is used to heat on the journal to be heated, and the spray is quenched. Later, a semi-automatic crankshaft quenching machine was developed, and a large quantity of crankshaft neck quenched. The advantage is that the labor intensity is low. The disadvantage is that the hardening zone is uneven, and the hard layer is width at the end of the link journal, and the lower point is hardenated The area is narrow. This process has been taken more than 60 years, and now a certain car crankshaft, the tractor crankshaft also uses this process production.
2. Crankshaft rotation heat, use a semi-ring sensor, mass production in semi-automatic or automatic crankshaft quenching machine, which is that the temperature of the hardening area is uniform, and the power pulsation is achieved by power pulsation. The big advantage is possible. The journal of the crankshaft is quenched, and the fatigue strength of the crankshaft is the current application of a wide range of crankshaft quenching processes.
3. The crankshaft is not rotated, and the heating curvature is coupled to the half-ring sub-coil, referred to as a Sharp-C process. The advantage is that the heating time is short, and a journal heating time is about 4s, and the floor area is smaller than that of the rotary quenching device, the sensor life is long, but this process does not solve the crankshaft rounded quenching technology.
4. Adopting a double half-ring sensor, almost all of the curve neck is all advantages over this process, and the heating efficiency is high, and the time is short.