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How to maintain product precision in precision injection molding

2023-06-05

1. What is precision injection molding

Precision injection molding generally refers to an injection molding method in which the dimension repeatability of processed and formed injection products is high, and it is difficult to meet the requirements with general-purpose injection molding machines and general-purpose injection molding techniques. The injection mold is an important condition to determine whether the injection molded parts meet the precision tolerance required by the design, and the precision injection molding machine is the key equipment to ensure that the product can always meet the required dimensional tolerance and ensure a very high yield.

2. Characteristics of precision injection molding

(1) The dimensional accuracy of injection molded parts is high and the tolerance is small;

(2) Injection molded parts have high repeatability and require high dimensional stability;

(3) The materials used in the manufacture of injection molds should be good, the rigidity of the materials should be sufficient, and the dimensional accuracy and smoothness of the cavity and the positioning accuracy between the templates should be high;

(4) Replace conventional injection machines with precision injection machines;

(5) Adopt precision injection molding process;

(6) Select materials suitable for precision injection molding.

3. The main factors affecting the precision of injection molded parts;

(1) Precision of injection mold;

(2) Shrinkage during injection molding

(3) The ambient temperature, humidity and fluctuation range of injection molded parts.

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