Injection molding process of mobile phone shell

Abstract

The invention relates to an injection molding process of a mobile phone shell. The injection molding process comprises the following steps: (1) a metal lining with a downward flange on the periphery and upwards projected by a small angle from periphery to center is produced; (2) the metal lining coats a convex mold of an injection molding machine by dint of the downward flange on the periphery of the metal lining; and the upper projected part of the metal lining is towards a concave mold of the injection molding machine; (3) after the molds of the injection molding machine are closed, plastic in a molten state is injected in cavities of the molds by using pressure to be bonded with the metal lining as a whole to form a metal reinforced plastic shell; (4) the injection-molded metal reinforced plastic shell is cooled at normal temperature; and in the cooling process, the upper projected part of the metal lining shrinks to deform in the opposite direction under a cold shrinkage principle until a horizontal shape is formed; and (5) after the metal reinforced plastic shell is cooled, the downward flange on the periphery of the metal lining is turned off. The process can improve the product yield, and guarantees no plastic residual liquid and uneven phenomenon on the surface of the mobile phone shell.

Description

technical field [0001] The invention relates to the field of shell production of electronic products, in particular to an injection molding process for a mobile phone shell. Background technique [0002] With the continuous development of industry, the requirements of products are getting higher and higher. At present, mobile phones tend to be thinner and lighter, so the shells of mobile phones are becoming thinner and thinner, but this brings about the problem of low strength of the shell. Injection molded hardware steel sheets to improve the strength of the shell. That is, by placing the metal steel sheet on the punch of the injection molding machine, after the die is closed, the molten plastic is injected into the mold cavity by pressure, and then bonded with the metal steel sheet as a whole. Since there must be a gap between the periphery of the metal steel sheet and the die when the mold is closed, the plastic solution in the mold cavity is easy to flow along the gap ...

AI Technical Summary

Problems solved by technology

Since there must be a gap between the periphery of the metal steel sheet and the die when the mold is closed, the plastic solution in the mold cavity is easy to flow along the gap to the back of the metal steel sheet, so that the surface of the final formed mobile phone shell Plastic residual liquid is left, which affects the yield

At the same time, after injection molding, since the hardware steel sheet will produce a certain amount of deformation to the bottom according to the principle of cold shrinkage during the cooling process, it will cause unevenness on the surface of the mobile phone shell.

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