Method for conducting induction quenching on engine crankshaft

Abstract

The invention discloses a method for conducting induction quenching on an engine crankshaft, and relates to the field of crankshaft production. The invention mainly aims to solve the problem that thecrankshaft with the overlapping part of two staggered corners being thin is prone to excessive heating when fillet quenching is conducted to result in melting or cracking of an overlapping area at present. A cooling water spraying device is arranged on a connecting rod quenching sensor of a full-automatic quenching machine tool, that is, two rectangular copper pipes are mounted on an outer side plate, which is close to the overlapped crank end, of the connecting rod quenching sensor, the water inlet ends of the rectangular copper pipes are connected with a water inlet pipe, and the water outlet ends of the two rectangular steel pipes are aligned to the thin connecting rod crank, so that it is guaranteed that water at the two water outlets can be sprayed to the position of the connecting rod crank. When the full-automatic quenching machine tool works, the quenching sensor is placed at the working position, the crankshaft is heated firstly, and then the equipment sprays a quenching liquid; and when the crankshaft is heated, cooling water is sprayed to the connecting rod crank part through the two rectangular copper pipes for cooling. The method has the advantage that the problems ofoverburning and melting of the overlapping part are prevented.

Description

Technical field: [0001] The invention relates to the field of crankshaft production, in particular to a method for induction hardening an engine crankshaft. Background technique: [0002] The crankshaft is an important part of the engine, and its main damage forms are fatigue fracture and wear of the journal. Therefore, the goal of improving the performance of the crankshaft is to improve its fatigue strength and wear resistance. The crankshaft fillet induction hardening process can significantly improve the fatigue strength, which is an effective way to increase the output power of the engine and prolong the service life of the crankshaft. The way of induction hardening is to use the crankshaft automatic hardening machine tool to carry out dual power supply and double connecting rod heating and quenching at the same time. By setting the process parameters, the process is controlled by the machine tool program. [0003] At present, there is a crankshaft with a special struc...

AI Technical Summary

Problems solved by technology

The crankshaft with this structure has the following problems in the fillet quenching: because the thickness of the overlapping parts of the two staggered turns of the crankshaft is only 6mm thin, it is easy to overheat when heated, and the control of the hardened layer is unstable. First, the heating is insufficient, and the depth of the quenched layer cannot reach meet the requirements; the second is that the heating is too strong, so that the overlapping area melts or cracks