Tips when milling plastics?
来源： 作者： 发布日期：2021-06-27 访问次数：644
Tips when milling plastics?
Polyvinyl chloride, polystyrene, nylon, fluorine plastic, plexiglass, polyethylene thermoplastic resin. The hardness of these materials is very low (9.2-17.4HB), lower tensile strength (14 a 60MPa). Low thermal conductivity [0.0418 ~ 0.193w / (m · K)] (1/175 - 1/458 general steel thermal conductivity), the elastic modulus is minimal. When cutting, under the same cutting conditions, the cutting force is only 1/14 when 45 steel cutting; although its low thermal conductivity, hardness, but it is also very low, so it does not exceed the maximum cutting temperature 120 ℃ ; Because thermoplastics low melting point, when the cutting temperature does not reach the melting point, they begin to soften, resulting in smearing phenomenon, affecting the degree of surface smoothness, softening point of 180 a nylon 1010 220 ℃, polystyrene is 95 ℃, PMMA was 60 ℃.
(1) tool materials. High-speed steel or carbide.
(2) tool geometry parameters. 7. = 15 ° a 25 °. Since the elastic modulus of these materials is extremely small, a large elastic recovery, to reduce the flank friction, take a. = 15 ° a 18 °. To control the direction of chip, helix angle = 20 ° endmills a 25 °. Main angle face milling Kr = 45 °. Milling capacity of some large flute as possible.
(3) the amount of milling. As long as the temperature does not exceed the softening temperature of the cutting material and the phenomenon of generating painting, VC should be higher in order to improve processing efficiency.
Polyvinyl chloride, polystyrene, nylon, fluorine plastic, plexiglass, polyethylene thermoplastic resin. The hardness of these materials is very low (9.2-17.4HB), lower tensile strength (14 a 60MPa). Low thermal conductivity [0.0418 ~ 0.193w / (m · K)] (1/175 - 1/458 general steel thermal conductivity), the elastic modulus is minimal. When cutting, under the same cutting conditions, the cutting force is only 1/14 when 45 steel cutting; although its low thermal conductivity, hardness, but it is also very low, so it does not exceed the maximum cutting temperature 120 ℃ ; Because thermoplastics low melting point, when the cutting temperature does not reach the melting point, they begin to soften, resulting in smearing phenomenon, affecting the degree of surface smoothness, softening point of 180 a nylon 1010 220 ℃, polystyrene is 95 ℃, PMMA was 60 ℃.
(1) tool materials. High-speed steel or carbide.
(2) tool geometry parameters. 7. = 15 ° a 25 °. Since the elastic modulus of these materials is extremely small, a large elastic recovery, to reduce the flank friction, take a. = 15 ° a 18 °. To control the direction of chip, helix angle = 20 ° endmills a 25 °. Main angle face milling Kr = 45 °. Milling capacity of some large flute as possible.
(3) the amount of milling. As long as the temperature does not exceed the softening temperature of the cutting material and the phenomenon of generating painting, VC should be higher in order to improve processing efficiency.
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