What are the general requirements for steel used in plastic mold manufacturing?

by:NJPE     2020-01-29
What are the general requirements for steel used in plastic mold manufacturing? Regarding the rigid requirements for the manufacture of plastic molds, NJPE will introduce it to you today: when pressing plastics, it can be divided into two types of substrates, one is thermosetting plastics, one is thermoplastic. Thermosetting plastics such as Bakelite powder are pressed and permanently formed under heating and pressure. The Bakelite mould bears pressure periodically and is at 150 ~ It is continuously heated at 200 ℃. Thermoplastics, such as polyvinyl chloride, are generally molded by injection. The plastic is heated in an independent heating chamber and then injected into a colder plastic mold in a softened state to apply pressure to make it cold and hard. The normal operating temperature of the injection mold is 120 ~ 180 ℃, also as high as 260 ℃. However, the water-cooled cavity is usually used during operation, so the degree of heat, stress and abrasion is relatively light. Only some varieties, such as plastics containing chlorine and fluorine, separate out harmful gases during pressing, which have great erosion effect on the cavity. According to the working conditions and characteristics of precision plastic molds, the following requirements are put forward for steel for plastic molds: ① the steel material needs to be very pure to obtain a highly glossy processed surface. Therefore, it requires less inclusions, less segregation, compact structure and high surface hardness; (2) the surface should be wear-resistant and corrosion-resistant, requiring a certain surface hardening layer, generally above 45hrc, and the surface finish should remain unchanged for a long time; (3) has sufficient strength and toughness, can bear the load without deformation or damage; (4) heat treatment deformation is small to ensure interchangeability and matching accuracy; ⑤ Good electrical processing capability. NJPE simple description of mold control precision injection NJPE share plastic injection mold is how to make?
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