Injection molds' lifespan refers to the total amount of products that can be produced while ensuring the quality of the processed products, which includes the lifespan after multiple regrinds of the working surface and replacement of vulnerable parts. The reasons affecting the lifespan of injection molding mould are as follows:
The accuracy and stiffness of the equipment used, lubrication conditions, the pre-treatment of the processed materials, and the preheating and cooling conditions of the molds all affect the lifespan of the injection molds. For example, precision punching of thin materials is particularly sensitive to the accuracy and stiffness of the press, requiring a high-precision and high-stiffness press to achieve good results.
The defects produced during the processing and heat treatment of the parts of the injection molds will affect their lifespan. For example, knife marks remaining on the surface of the plastic injection mould tooling, small cracks produced during electrical discharge machining, and defects such as carbonization and decarburization during heat treatment all have an impact on the load-bearing capacity and lifespan of injection molding moulds.
The surface quality, mechanical properties such as material hardness and elongation, and dimensional accuracy of the materials to be processed are directly related to the lifespan of injection molds. For example, nickel, a special alloy with a quality fraction of 80%, is prone to strong bite with the working surface of the injection molds during the forming process, causing the working surface to be bitten and torn, directly affecting whether the injection molding mould can work normally.
The material of the plastic injection mould tooling should be selected according to the production plan. For large production batches, high-performance injection molding mould materials with strong carrying capacity and good anti-fatigue damage ability should be chosen.
A reasonable injection molding mould structure helps to improve the load-bearing capacity of the injection molding mould and reduce the thermal and mechanical loads they bear. A reliable guiding mechanism for the injection molding mould can avoid mutual bite and damage between the male and female dies. Cold pier and cold extrusion molds that withstand high-strength loads can prevent stress concentration by changing the cross-sectional dimensions.
The forms of normal damage of injection molds are also different, including friction damage, plastic deformation, cracking, fatigue damage, and bite marks. Mold factories generally determine the design lifespan of injection molds based on the production plan of corresponding parts in the injection mould design phase.