PVC, polystyrene, nylon, fluorine plastic,organic glass, polyethylene resin, thermoplastic. The hardness of these materials is very low (9.2-17.4HB) and the tensile strength is low (14 60MPa). Low thermal conductivity 0.0418~0.193w/ (m K)] (1/175 one for the general steel thermal conductivity of a 1/458), the elastic modulus of a tiny. Cutting, under the same cutting conditions, the cutting force only when cutting 45 steel 1 / 14; although its thermal conductivity is extremely low, but its hardness is low, so the cutting temperature does not exceed the maximum of 120 DEG C; because the thermoplastic plastic melting point low, when the cutting temperature not to reach the melting point, began to become soft, smear caused by the phenomenon, and the impact of the smoothness of the surface of the workpiece and nylon 1010 the softening point of 180 to 220 DEG C, polystyrene (PS) and 95 DEG C, organic glass is 60 DEG C
Cutting tool material. High speed steel or hard alloy.Geometric parameters of cutter. 7. = 15 degree 25. Because of the elastic modulus of this material, the elasticity recovery is big, and the friction of the flank face is reduced, and a. =15 18 degree. In order to control the chip direction, the screw angle of the end mill is 25 =20.. The main angle of face milling cutter Kr=45. The chip groove of the milling cutter should be as large as possible..
Milling dosage. As long as the cutting temperature does not exceed the softening temperature of the material and produce the smear phenomenon, VC should be higher to improve the processing efficiency.
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