Manufacture method for appearance panel with greatly-changed local wall thickness

Abstract

The invention provides a manufacture method for an appearance panel with greatly-changed local wall thickness. An appearance panel die comprises a compression oil cylinder, a connecting rod, a cam, a compression block and an injection part cavity, wherein, the compression block is arranged at the back side of the appearance panel die and can move back and forth, the compression oil cylinder is connected with the cam through the connecting rod, and the top of the cam contacts with the compression block. The appearance panel die is characterized in that: during injection molding and latex injection, the transverse plane of the compression block moves backward, which enables the wall thickness at a position corresponding to the injection part cavity to maintain great; and after plastic melt passes through an area where the compression block is located, the compression block is pressed to a desired position, which enables the wall at a position corresponding to the injection part cavity to be thinned to a desired thickness through pressing. According to the invention, a thin wall area maintains a great thickness during injection molding, easy filling is realized, the defects of encapsulation air trapping and the like are avoided, and subsequent extrusion motion enables a redundant sizing material to carry out actions like maintaining pressure and supplementing latex in the thin wall area, thereby reducing surface shrinkage in a wall thickness varying area.

Description

technical field [0001] The invention relates to a method for manufacturing an appearance panel with a large variation in local wall thickness. Background technique [0002] In the design of a smooth appearance panel, when the wall thickness of the appearance panel changes by more than 25%, shrinkage marks are likely to occur at the junction of thickness and thickness during injection molding, and encapsulation and trapped air are likely to occur at the thin wall, resulting in air marks and weld lines and other appearance defects. For this reason, the vast majority of technicians use the technology of large transition slope and variable mold temperature to solve the problem of injection molding of appearance panels with large wall thickness changes. However, a large transition bevel usually causes a large area of ​​the appearance panel to become thinner and lower in strength, or some structures on the back of the panel restrict the transition bevel from being too large, and ...

AI Technical Summary

Problems solved by technology

However, the large transition slope usually causes the appearance panel to become thinner in a large area, and the strength is reduced, or some structures on the back of the panel limit the transition slope to not be too large, and the use of variable mold temperature technology will greatly increase the cost of molds and injection molding.

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