Adjustment method for weld line of injection-molded product

Abstract

The invention discloses an adjustment method for a weld line of an injection-molded product. The adjustment method for the weld line of the injection-molded product comprises the steps that grid analysis is conducted on a product to be injection molded, the filling form of the product to be injection molded is simplified into a ridge-form isometric view, and the included angle line of a molded surface is determined; mold flow analysis is conducted on the product to be injection molded according to the included angle line of the molded surface, and the position of a main sprue of the product to be injection molded is determined; mold assembling is conducted, material flow is injected, and the weld angle of the surface A is made to be larger than 130 degrees by controlling the rubber outlet and ending position through a valve sprue and changing the direction of material flow through the mold temperature difference according to the feature structure of the product to be injection molded; and cooling and demolding are conducted, and the injection-molded product is taken out. According to the adjustment method for the weld line of the injection-molded product, the filling form of the product to be injection molded is simplified into the ridge-form isometric view, and the weld line on the surface A of the injection-molded product is shielded by hiding the weld line to the surface B, and thus the weld line cannot be seen with naked eyes; and the injection-molded product prepared through the method is good in surface quality, and the adjustment method is high in actual operability and universality.

Description

technical field [0001] The invention relates to the technical field of injection molding, in particular to a method for debugging welding lines of injection molding products. Background technique [0002] Weld lines often appear in injection molded products, and weld lines directly affect the appearance and performance of injection molded products. [0003] ①. At present, the welding lines of exterior injection molding products for automobiles are mostly painted, which will cause environmental pollution, and the VOC in the car exceeds the standard. These defects are due to the paint environment, which is difficult to meet the standard and the cost is high; [0004] ②. At present, the welding line of the exterior injection molding products for automobiles is often used in the early stage of development to control the risk by using Moldflow simulation analysis; it is currently the mainstream to evaluate the early manufacturing plan through Moldflow simulation analysis, but the...

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Problems solved by technology

[0003] ①. At present, the welding lines of exterior injection molding products for automobiles are mostly painted, which will cause environmental pollution, and the VOC in the car exceeds the standard. These defects are due to the paint environment, which is difficult to meet the standard and the cost is high;

[0004] ②. At present, the welding line of the exterior injection molding products for automobiles is often used in the early stage of development to control the risk by using Moldflow simulation analysis; it is currently the mainstream to evaluate the early manufacturing plan through Moldflow simulation analysis, but the fitting results vary depending on the machine and material. The difference between the law and the actual situation will be different, especially for large products;

[0005] ③. At present, there is no specific effective control method for the process debugging method of the welding line of injection molding products, but through the summary of many factories, most of them weaken the welding line by increasing the material temperature, mold temperature, and increasing the filling pressure and flow rate. The visual sense; the process method used is relatively simple and not universal. This method is only effective for products with a process ratio less than 170mm, and has no effect on products with a process ratio greater than 300mm;

[0006] ④. At present, for the welding line of injection molding products, from the mold transformation plan, most of them use the method of adding bridges to weaken the visual sense of the welding line; it involves structural changes, the purpose is to change the position of the welding line, the practicality is poor, and post-processing work is increased

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