When using hard steel of temper by dipping in water of turning of PCBN cutting tool, requirement workpiece quenchs 45~55HRC of hardness prep above, treatment is good cast-iron when, hardness level waits in wanting hardness to achieve only (45HRC) , can obtain favorable treatment result. Like car engine the crock builds the exhaust valve base that go up, this valve base is to use the data of tall chromic alloy cast iron that contains copper, molybdenum, its hardness is 44HRC about commonly, the Kong Cai on its valve base uses Huo (bore with a reamer) , car two kinds of craft, it is mostly machine on special transfer matic, with conduit of gun bore with a reamer aperture undertakes together. Uses cutting dosage is: Vc=71. 6m/min, vf=26.
5mm/min, ap=1.
0mm, use BC broaching oil, after using PCBN cutting tool to machine, machine photograph comparing with all sorts of hard alloy bit that use before, average durability is cutting tool 1200, treatment surface surface roughness is Ra0.
4 μ M, valve base face places poor ≤ 0.
05mm. The factory used motor of east wind Motor Corporation 1988 oneself after PCBN cutting tool, its effect keeps stable all the time, the cutting tool that better land solved imported equipment is homebred turn an issue. CNC Milling
CNC Machining