... shaft pins, rocker, and other accessories high frequency hardening machine.hardware tools high-frequency hardening heat treatment, for example ... rotor, reversing shaft in vavle,gear high-frequency hardening machine.all kinds of power tools gear shafts high-frequency ... , silver, gold, and aluminium materials, etc. 2. Melting capacity can be from 3KG to 300KG. IGBT high frequency cooper melting machine