Induction quenching process for hardening alloy cast iron camshaft by using compressed air

• Main Authors: WANG TIANBAO, LIU JUNKAI
• Format: Patent
• Language: Chinese; English
• Published: 07.04.2020
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides an induction quenching process for hardening an alloy cast iron camshaft by using compressed air, which comprises the following steps: S1, preheating is carried out: the camshaft is heated to 180-210 DEG C in an induction manner in a first stage, heating is suspended for 2-5 seconds, in a second stage, after the camshaft is inductively heated to 550-600 DEG C, heating is suspended for 2-5 seconds, and in a third stage, after the camshaft is inductively heated to 810-850 DEG C, heating is suspended for 2-5 seconds, wherein the heating rates of the three stages are all 40-50 DEG C/s; S2, heating to a quenching temperature is carried out: induction heating is carried out on the camshaft preheated in the step S1 to 900-940 DEG C at a heating rate of 40-50 DEG C/s; S3, quenching is conducted, specifically, compressed air with the pressure of 0.4-0.5 MPa is adopted as a quenching medium to quench the camshaft, and the camshaft is cooled to 250-300 DEG C; and S4, afterheat tempering is carried