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News & Knowledge

What kinds of technology does crankshaft journal induction quenching have?


Crankshaft journal High frequency induction heating machine quenching has the following four quenching processes:


1) The crankshaft does not rotate, and the crankshaft shall be heated on the journal to be heated with the open-close type inductor sleeve, and the spray quenching shall be carried out.Later, a semi-automatic crankshaft quenching machine was developed to conduct bulk crankshaft neck quenching, the advantage is low labor intensity, the disadvantage is the hardening area is not uniform, such as connecting rod journal on the spot of the quenching layer width, the bottom spot of the quenching area is narrow.This process has been in use for more than 60 years, and now a certain car crankshaft, tractor crankshaft also use this process production.


2) Crankshaft heating, adopting the half ring sensors, on the semi-automatic or fully automatic or automatic crankshaft quenching machine tool for mass production, its advantage is hardened zone temperature uniformity, on using technologies such as power pulse width to achieve consistently, the biggest advantage is able to journal fillet hardening, to improve the crankshaft fatigue strength, is currently the most widely used crank quenching process.


3) The crankshaft does not rotate, and the crankshaft neck is heated by coupling the semi-ring main coil and semi-ring secondary coil, which is called sharp-e process.Its advantages are short heating time, a journal heating time in about 4s, equipment floor area is smaller than the rotary quenching device, long sensor life, etc., but this process has not solved the crankshaft fillet quenching technology.


4) Crankshaft rotary quenching, the use of a double half ring type inductor, almost all the crankshaft neck is covered by the advantages of this process is high heating efficiency, short time.At present, only applied to the car crankshaft, is a Japanese company patent.