Choosing plastic mold steel is a very important process in mold manufacturing, because the classification of plastic mold are generally on the length of plastic mold by 5 grades, grade1 is over a million times; grade 2 is 500,000-100 million; grade3 is from 300,000 to 500,000; grade4 is from 100,000 to 300,000, grade 5 is 10 million below
for Grade1 and 2, mold stell require hardness after heat-treatment reaching around HRC50 , because plastic which is easy to wear, could violate the tolerance, so we should select steel heat afetr treatment showing better performance, but also at high hardness of the state has good cutting performance, normally, it can be introduced to choose imported raw materials in the Pearl River Delta.
Usually chosen in Sweden 8407, S136, U.S. 420, H13, Europe, 2316,2344,083, or Japan SKD61, DC53 (the original mold for the metal material, the use of special circumstances.) grade 1 steel. In addition, raw plastic materials and the added filler have a great impact on the mold steel choice, especially glass fiber could have a very strong worn impact on the mold cavity surface.
Some plastic materials have acid corrosion, and some added modified enhancer or other agent, such as glass fiber lead to mold damage, so plastic material selection should be considered. There is strong general election corrosive plastic S136, 2316,420 grade1 steel, then weak corrosive plastic should elect S136, 2316,420, there SKD61, NAK80, PAK90, 718M. Strong acid plastic material: PVC, POM, PBT plastic material weak acid has: PC, PP, PMMA, PA,
Product appearance of the requirements of the selection of plastic mold material there is also a great impact, transparent pieces and surface requirements of parabolic mirror products, may choose to use the material S136, 2316,718 S, NAK80, PAK90, 420, high transparency of the mold should choose S136 and 420.
More than meeting the product requirements are from the run, but, are you involved in the demand for the cost of molds? you should also consider price, Take the S136 to compare with 2316, a difference of 55-60 yuan per kilogram, if you choose incorrectly, you may lose much money
Pre-hardened mold steel , there is grade: S136H, 2316H, 718H, 083H, hardness HB270 —- 340, 45 die by P20, 718,738,618,2311,2711, particularly low for the requirements molds, may have used S50C, 45 # steel, that is, directly in the mold cavity up to do.
When plastic is molded, due to molecular stretching and shearing, residual stress is left in the product, which causes the product to warp and even crack.
Residual stress is also generated during the machining of the mold steel. This residual stress causes the mold to deform or even crack.
The prime function of any mould steel must be that of meeting the service requirements imposed upon it.
Moulding requirements vary， e.g., from simple prototype work undertaken on soft aluminum construction moulds to fully hardened alloy steel volume production moulding to close dimensional tolerances.
The plastic mold application must be thoroughly investigated and fully understood before a selection decision can be made to avoid costly long-term mistakes.
Once decided upon， the selected material should be written into the tooling specification for future procurement purposes.
Using a tooling specification laying out the mould requirements before tool quotation or construction greatly reduces the risk of fundamental mistakes at the toolmaking stage.
The choice of mould steel is of great importance if the mould is to function effectively.
When plastic is molded, due to molecular stretching and shearing, residual stress is left in the product, which causes the product to warp and even crack.
Residual stress is also generated during the machining of the mold steel. This residual stress also causes the mold to deform or even crack.
The prime function of any mould steel must be that of meeting the service requirements imposed upon it.
Moulding requirements vary，e.g. from simple prototype work undertaken on soft aluminium construction moulds, to fully hardened alloy steel volume production moulds moulding to close dimensional tolerances.
In order to avoid costly long-term mistakes, the plastic mould application must be thoroughly investigated and fully understood before a selection decision can be made.
Once decided upon，the selected material should be written into the tooling specification for future procurement purposes.
The use of a tooling specification laying out the mould requirements prior to tool quotation or construction greatly reduces the risk of fundamental mistakes being made at the toolmaking stage.
Hi
Could you please suggest me mold steel material for processing polysulfone transparent material?
Hi Ajay, the mold steel for transparent material is easy to find in your market, but if your product has some special requirement, maybe we can have talk.