Heat Treatment In Injection Mold Manufacturing

In order to make the injection mould precise and high-quality, injection molding manufacturing will heat the injection moulds. It can not only improve the precision of the injection moulds but also improve the quality and precision of the injection molded parts. SWY MOULD share precautions about heat treatment of plastic injection mold with product companies.

1. Forging process

This is an important section in the manufacturing of working parts of plastic injection mould. For injection mould made of high-alloy tool steel, there are generally process requirements for the metallographic structure such as material carbide distribution. In addition, the forging temperature range should be strictly controlled, the correct heating specification should be established, the correct forging force method should be used, and the post-forging slow cooling or timely annealing should be carried out.

2. Pre-heat treatment

According to the difference in the mould material of working parts of injection mould, the different pre-heat treatment processes such as annealing, normalizing or quenching, and tempering should be used. The high-carbon alloy mould steel can eliminate the reticulated secondary cementite or chain carbide after proper pre-heat treatment so that the carbide is spheroidized and refined, and the uniformity of carbide distribution is promoted. This is beneficial to ensure the quality of quenching and tempering and improve the injection mould service life.

3. Quenching and tempering

This is the key link in the heat treatment of injection mould. If the superheat occurs during quenching and heating, it not only will cause greater brittleness of the workpiece but also cause deformation and cracking during cooling, which will seriously affect the mould service life.

Here is the heat treatment of concrete plastic ladder spacer injection mould:

4. Annealing

The stress relief annealing should be carried out after the processing of plastic injection mould. The purpose is to eliminate the internal stress caused by rough machining, so as to avoid excessive deformation and cracking caused by quenching. For plastic moulds with high precision requirements, it needs to be subjected to stress relief and tempering after grinding or electric machining, which is beneficial to stabilize mould precision and improve mould service life.

Heat treatment of plastic mould is especially important for injection molding companies. However, not every injection molding factory can carry it out in a standard way. We are a plastic injection molding manufacturer located in Huangyan, Taizhou, China, we provide one-stop plastic injection molding services. If your product is in the concept stage, you can contact our SWY MOULD, the engineers of SWY will give you the best solution, recommend the most suitable materials, and help you take the lead in the market.