Method and device for adjusting runner balance of multi-cavity mold

Abstract

The invention provides a method and a device for adjusting the runner balance of a multi-cavity mold. The method comprises the following steps: acquiring the mass of each short shot product formed by the fluid raw material injected into each cavity of the mold; calculating the mass ratio between each short shot product and the corresponding finished product; calculating the difference between the maximal mass ratio and the minimal mass ratio; judging whether the difference is greater than a preset value; when the difference is greater than the preset value, calculating the average value of all the mass ratios except the maximal and the minimal mass ratios; adjusting the flow speed of the fluid raw material flowing into the cavities according to the average value. The existing method of judging the balance state through manual observation is avoided; an abstract problem is achieved by converting picture modes into data analysis.

Description

Technical field [0001] The invention relates to the field of injection molding, in particular to a method and a device for adjusting the flow channel balance of a multi-cavity mold. Background technique [0002] In the field of injection molding, in order to improve production efficiency, a multi-cavity mold is usually used to produce medium and small plastic parts. In order to ensure that the weight, performance and other quality indicators of each mold cavity are uniform, the pouring system must be balanced and analyzed to keep the runners of the pouring system balanced, that is, under the same injection speed of each cavity, try to make Each cavity is filled simultaneously. If the runner is unbalanced, the following problems may occur: the holding pressure time is prolonged, which increases the product molding cycle and reduces production efficiency; part of the cavity is not filled, and other cavities have been over-filled (over-packing), causing the product to appear Flash...

AI Technical Summary

Problems solved by technology

If the runners are unbalanced, the following problems may occur: the holding time is prolonged, the product molding cycle is increased, and the production efficiency is reduced; some cavities are not filled, and other cavities have been overfilled (over-holding pressure), causing the product to appear Flashing; over-holding pressure leads to uneven internal stress of the product, resulting in easy deformation of the product and unstable appearance dimensions; uneven cavity pressure increases the clamping force, deforms the mold, and reduces the service life of the mold

specifically, figure 1 It shows a one-mold eight-cavity mold for manufacturing circuit breaker housings, the mold cavities are numbered F1-F8, and the shapes of the eight mold cavities are not exactly the same, specifically, four of the mold cavities (F1, F2, F7, F8) is used to make the lower half of the shell, and the other 4 cavities (F3, F4, F5, F6) are used to make the upper half of the shell, firstly use the above mold to make 8 short shots when making a judgment After the product is finished, the difference in the volume of each short-shot product is artificially observed, and the flow channel balance difference is judged based on experience and the flow rate is adjusted. six chambers, thirty-two chambers), such methods are not supported by factual data, and the judgment results may be one-sided and controversial, resulting in unobjective analysis results. It can be seen that this kind of judgment method consumes a lot of manpower. Less efficient and less accurate

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