• 2023-06-06
• 319
• 5 Comments

How to choose the right materials for the mold accessories is the key to the smooth production of th

1. Good machining performance. Choose steel that is easy to cut and can get high precision parts after machining.

2. Excellent polishing performance. The working surface of injection molding parts should be polished to a mirror, Ra≤0.05μm. The hardness of steel should be HRC35 ~ 40. Hard surfaces will make polishing difficult. The microstructure of steel should be uniform and dense, with few impurities, no defects and needle points.

3. Good wear resistance and fatigue resistance. The injection cavity is not only scoured by high pressure plastic melt, but also subjected to the alternating stress of hot and cold temperature. General high carbon alloy steel can be heat-treated to obtain high hardness, but toughness is easy to form surface cracks, not to be used. The selected steel should reduce the polishing and repair times of the injection mold, maintain the dimensional accuracy of the cavity for a long time, and achieve the service life of the planned mass production.

4. Corrosion resistance. For some plastic varieties, such as polyvinyl chloride and flame retardant plastics, must consider the choice of steel with corrosion resistance.