Method for confirming shrinkage of automobile part subjected to injection molding

Abstract

The invention relates to a method for confirming the shrinkage of an automobile part subjected to injection molding, which comprises the following steps of: (1) selecting at least one position on an injection mold of the automobile part, and dotting and marking; (2) performing injection molding on a product on the mold, and marking a point position of the actual size of the product after the product is subjected to injection molding; and (3) comparing the size difference of the mold and the product, and calculating the shrinkage of the part made of a certain material. By the method, product yield is improved, waste products are reduced, and quality cost is reduced; and problems possibly occur after the product is subjected to mass production are demonstrated and foreseen through tests at the product development stage, the project development capability of a factory is improved, and guarantee is provided for upgrading the technology of the production factory and enhancing a cooperative partnership between the production factory and an automobile main engine factory.

Description

Technical field [0001] The invention belongs to the field of injection molding of auto parts, and particularly relates to a method capable of accurately confirming the shrinkage rate of auto parts after injection molding. Background technique [0002] The injection molding process has been widely used in the auto parts production industry. In various industrial processing industries, the quality requirements of auto parts are very high. In the category of dents in plastic parts, product shrinkage is a common phenomenon. Solving the problem of product shrinkage is an urgent issue for many auto parts manufacturers. [0003] The large flat exterior parts of the car are prone to shrinkage, especially from the vicinity of the gate to the position of the reinforcing rib of the plastic part. This is because at the position of the ribs, often the injection pressure or holding pressure can be reduced, and the corresponding thickness of the plastic part will also increase, so the shrinkag...

AI Technical Summary

Problems solved by technology

[0004] Injection molded parts material suppliers usually provide the shrinkage range of the material to the production company. The production factory often confirms the shrinkage range provided by the material factory and personal experience. The disadvantages of this method are that the range is large and difficult to select, and the second is that Misjudgments such as the emergence of new materials without experience

This method of relying on empirical judgment is unstable, especially when new materials are switched to production, and the craftsmen have no experience to refer to, so they need to try and explore the setting range of process conditions repeatedly, resulting in a large number of unqualified products.

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