Method for setting mould according to deformation quantity of glass fibre product

Abstract

The invention provides a method for setting a mould according to the deformation quantity of a glass fibre product, wherein the circular glass fibre product is shrunk to form a spherical crown type glass fibre product while being subjected to injection moulding. The method comprises the following steps: firstly, the shrinkage rate X along the flowing direction of an injection moulding material of the glass fibre product, the shrinkage rate Y vertical to the flowing direction of the injection moulding material of the glass fibre product and a semi-diameter R before shrinkage of the circular glass fibre product are measured through tests; then, the height H of the spherical crown, namely the deformation quantity of the glass fibre product, is obtained by calculation, therefore, the deformation quantity of the glass fibre product is calculated and pre-evaluated precisely; then, setting of a product mould is guided according to the theoretically calculated deformation quantity, when the deformation quantity H is more than a pre-set critical deformation quantity H0, the number of glue inlets of the mould is increased, and when the deformation quantity H is less than or equal to the pre-set critical deformation quantity H0, the number of the glue inlets of the mould is constant; at the time, the deformation problem can be further solved by adopting other corresponding measures; therefore, the development difficulty is reduced; the development period is shortened; and the development cost is saved.

Description

technical field [0001] The invention relates to a method for setting a mold according to the deformation amount of a glass fiber product. Background technique [0002] Due to its obvious advantages in mechanical properties and cost, glass fiber products have been widely used in automotive interior parts in recent years. However, due to the orientation of glass fibers in the product, it is easy to cause uneven shrinkage of the product, resulting in deformation of the product. more obvious. E.g figure 1 As shown, for the glass fiber product with the injection port 3 located at the center of the circle, the shrinkage along the flow direction (direction shown by arrow 2) due to the orientation of the glass fiber is much smaller than the vertical flow direction (direction shown by arrow 1) ) shrinkage, making glass fiber products by injection molding figure 1 The circle shown is deformed as figure 2 For the spherical cap shown, the height H of the spherical cap is the deform...

AI Technical Summary

Problems solved by technology

Since there is currently no method that can accurately calculate and estimate the amount of deformation, this leads to the need to continuously adjust and change the mold during the development process, resulting in difficult development, long cycle time, and high cost

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