How to choose plastic mould steel material?
/ Injection mould / Blow molding mould / Injection blow molding mould
The development of plastic products is very rapid, so plastic mold steel has made rapid development and become a special steel series.
For example, ASTM Standard in the United States, plastic mold steel includes 7 steel, and Japan's Datong plastic mold steel, including 13 steel, Japan Hitachi also such as 15 steel, Japan's 4~5 Nak series also has a steel.
The development trend of plastic mould steel is as follows:
1. easy cutting, polishing good plastic mold steel. This kind of steel has few impurities, microstructure is homogeneous, no fiber directionality, and the surface quality of mould cavity is high.
2.Pre-hardening plastic mold steel. This type of application has been widely used to pre-hardened steel block supply, hardness reached 23~48HRC, processing cavity after no longer treatment, no deformation, can shorten the mold manufacturing cycle. On behalf of the steel number are:
3.Aging Hardening type plastic mold steel. This kind of steel general carbon content is low, steel grades Add Ni, Al, Ti, Cu, MO and other elements, mold billet first after solid solution, in the low hardness of processing, after the aging treatment, due to the precipitation of intermetallic compounds, so that the hardness of the mold to 40~50HRC to meet the requirements of the use. Due to the low aging temperature, small deformation and a regular, suitable for the manufacture of complex shapes, high precision, super mirror and large plastic molds, especially thermoplastic products with molds. Aging Hardening plastic mold steel has martensite aging hardening steel and precipitation (precipitation) hardening steel two categories.
4.The whole hardened plastic mold steel. Abroad are generally borrowed from the high wear-resistant cold die steel and hot-die steel. such as the United States A2 (CR5MO1V), D3 (Cr12), D2 (CR12MO1V), such as cold mold steel and H13 (4CR5MOSIV1), such as hot as mold steel.
5.Corrosion resistant plastic mold steel. Some plastic products such as polyvinyl chloride, fluorine plastic, flame-retardant plastic, in the process of mold corrosion, so the general use of martensitic stainless steel and precipitation-hardened stainless steel. When the production of plastic products is small, the demand is not high, can be used in the mold surface chromium plating protection measures, but most of the case need to use corrosion-resistant steel manufacturing mold.
6.Non-magnetic plastic mold steel. In order to adapt to the production of magnetic plastic products, some non-magnetic plastic mould steels have been developed abroad, and the austenitic mould steels have been treated by aging hardening to meet the required hardness, strength and low permeability. For example, Japan Datong NAK301 and Japan Hitachi HPM75 and so on.
7.At present, plastics are widely used in various sectors of the national economy, and the production of plastic has already far exceeded the world's steel production. The plastic mold is an indispensable tool in the plastics processing industry. Considering the complex structure and shape of plastic moulds, the variety specification is many, the request low surface roughness value, the manufacture difficulty is big, therefore discusses in the plastic mold steel material selection, should consider its working condition, the failure, the performance and so on, the reasonable choice plastic mold steel material to increase the plastic mold the service life and the manufacture cost.
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