... frequency heating quenching furnace for auto parts shaft Heat treatmentVarious kind of automobile parts, motorcycle parts, hardware tools, gears, chain ... heating, twist drills" heating upsetting and forging. Braze weldingMany lathe tool, drill bit, knives, saw bit, saw teeth ... , Machine Tool, etc. quenching;5, various hardware metal parts, machining parts. Such as shaft, gear (sprocket), cam, clamps, ...