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.
I am responsible for the purchase of mold steel in the company. I think your experience is worth learning.
As a mold engineer, I think the correct mold material is very important to the success of the mold.
I agree you at all, thanks for sharing
I am in charge of purchasing mould steel in the company. I very much agree with your experience.
The most important is to select the mold steel according to the requirements of the product.
thanks for sharing experience on this issue, actually we always do like this
In fact, there are many kinds of mold steel, the right choice is very important.
your suggestions about choosing mold steel are very helpful, thanks for sharing
it is very important for every mold designer to correctly choose mold steel
when selecting mold steel, we should be familiar with plastics.