Machining method of E-shaped bushing

Abstract

A machining method of an E-shaped bushing comprises the steps that 1, a rough blank is manufactured, wherein the rough blank is sequentially provided with a special-shaped plate, a positioning cylinder, a connecting cylinder and a positioning block from top to bottom, and a center hole is formed in the middle of the special-shaped plate; 2, the upper surface of the special-shaped plate is cut, and a glue opening is formed; 3, nickel plating treatment is performed; 4, the positioning block is fixed, and rough turning machining is conducted on the outer diameter of the positioning cylinder; 5, the outer diameter of the positioning cylinder serves as the standard, and rough turning machining is conducted on the inner diameter of the center hole of the special-shaped plate; 6, the connecting cylinder and the positioning block of the semi-finished product are cut off, and the special-shaped plate and the positioning cylinder are left; 7, finish turning is conducted on the outer diameter of the positioning cylinder; and 8, finish turning is conducted on the inner diameter of the cavity and the inner diameter of a positioning channel, and a final finished product is formed. By means of the machining method, the concentricity of the cavity, the positioning channel and an upper mold core is ensured, and the situation that a plastic lens is eccentric is avoided.

Description

technical field [0001] The invention relates to fittings of plastic lens injection moulds, in particular to a processing method of E-type bushings. Background technique [0002] At present, optical plastic lenses are generally injection molded through injection molds. During injection molding, the plastic material needs to be injected into the cavity of the lower mold core, and then the upper mold core is moved downward to apply pressure to the plastic material while heating, so that the upper and lower surfaces of the plastic lens form spherical or aspherical surfaces. The diameter of the lens is equal to the inner diameter of the cavity. [0003] In order to improve the dimensional accuracy of plastic lenses, some injection molds are equipped with E-type bushings. The bushing is located between the upper die core and the lower die core. The cavity of the bushing replaces the cavity of the lower die core. The bushing itself is fixed in the die core. It plays the role of ...

AI Technical Summary

Problems solved by technology

[0005] However, since the processing of the cavity and the positioning channel of the E-type bushing belongs to the inner diameter processing, while the processing of the upper die core belongs to the outer diameter processing, the same set of processing positioning fixtures cannot be used for the processing of the E-type bushing and the upper die core. , resulting in the center of the cavity and positioning channel of the E-type bushing being prone to deviation relative to the center of the upper mold core, resulting in a high eccentricity of the plastic lens

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