Summary of induction heating quenching process

Induction heating: artifacts in sensors, sensor is generally input frequency or high frequency alternating current, 300 - 300000 hz or higher) The hollow copper pipe. In alternating magnetic field in the workpiece to produce induced current with frequency, the induced current distribution in the workpiece is not uniform, strong on the surface, and in the internal is very weak, the heart is close to zero, use the skin effect, can make the rapid heating surface, the surface temperature to rise to 800 - a few seconds Temperature of 1000 ℃, and the core is very small. Induction heating frequency choice: choose frequency according to the requirement of the heat treatment and heating depth, the higher the frequency heating depth is shallow. High frequency ( More than 10 KHZ) The depth of the heating of 0. 5 - 2. 5 mm, general used for heating of small to medium sized parts, such as small modulus gear and small and medium-sized shaft parts. Intermediate frequency ( 1 ~ 10 khz) For 2 - heating depth 10 mm, usually used in large diameter axial heating and big modulus gear. Power frequency ( 50HZ) Heating for 10 - hardening layer depth 20 mm, generally used for large size parts diathermy, large diameter parts ( Diameter & amp; 众人; More than 300 mm, such as roll, etc. ) The surface hardening. Produced in alternating magnetic field in induction heating surface quenching, the artifacts produced in the same frequency of the induced current. The induced current distribution in the workpiece is not uniform, the surface is strong, and the internal is very weak, the base close to zero. Use the skin effect, can make the surface heating quickly, within a few seconds surface temperatures to rise to 800 ~ 1000 ℃, and the substrate temperature is small. Due to the induction heating process is instantaneous high temperature, the cooling process, the metal surface will not only because of the rapid quenching martensite formation, and after a narrow hardened zone will get before the induction hardening preprocessing matrix organization.