Rubber injection cold runner design and optimization method

Abstract

The invention discloses a rubber injection cold runner design and optimization method. The method comprises the following steps that the number and positions of pouring gates are determined accordingto parameters of required rubber products, and paths of distribution channels are determined according to the positions of the pouring gates; through a fluid motion equation, the diameter of the distribution channels are primarily determined, and pressure of the pouring gates is equal; according to an emprical formula, required inlet flow of a cold runner and the value range of the diameter of thepouring gates are determined; the inlet flow, the diameter of the pouring gates and the diameter of the distribution channels in a cold runner pouring system are adopted as variables, and an orthogonal test is designed based on an orthogonal list; a PRO / E software is adopted to conduct a three-dimensional design of a cold runner test group, and a POLYFLOW software is adopted to carry out simulation analysis on a pressure field, a velocity field and a shear rate field in the rubber flow process in the cold runner; and according to requirements for the required product, an evaluation system isestablished for simulation results. According to the method, the design cycle of the rubber injection cold runner is shortened, and rationality and reliability of cold runner design are guaranteed.

Description

technical field [0001] The invention relates to the design field of rubber injection cold runners, in particular to a design and optimization method for rubber injection cold runners. Background technique [0002] Rubber injection molding technology is mainly used in small rubber products with multi-mode and multi-cavity and large rubber products with symmetrical structures. When designing cold runners for rubber products with symmetrical structures, due to their relatively simple structure symmetry, it is easy to achieve consistency of injection pressure and injection speed at each gate; while large rubber cold runners with asymmetric structures are designed When it is used, it is not easy to achieve the consistency of injection pressure and injection speed of each gate, so this kind of rubber product is prone to quality problems such as uneven quality and air bubbles during injection molding. For large-scale rubber products with asymmetric structures, compression molding ...

AI Technical Summary

Problems solved by technology

When designing cold runners for rubber products with symmetrical structures, due to their relatively simple structure symmetry, it is easy to achieve consistency of injection pressure and injection speed at each gate; while large rubber cold runners with asymmetric structures are designed It is not easy to achieve the consistency of injection pressure and injection speed of each gate, so this rubber product is prone to quality problems such as uneven quality and air bubbles during injection molding

For large-scale rubber products with asymmetric structures, compression molding is generally used, but this method has problems such as low molding efficiency, unstable quality, and high operating strength.

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