A kind of processing method of E-type bushing

Abstract

A processing method of an E-type bushing, comprising: step 1, manufacturing a rough embryo, the rough embryo has a special-shaped plate, a positioning cylinder, a connecting cylinder and a positioning block in sequence from top to bottom, and a center hole is provided in the middle of the special-shaped plate; step 2, Cut the upper surface of the special-shaped plate to form a glue port; step 3, carry out nickel plating; step 4, fix the positioning block, and perform rough machining on the outer diameter of the positioning cylinder; step 5, use the outer diameter of the positioning cylinder As a benchmark, rough turning the inner diameter of the center hole of the special-shaped plate; step 6, cut off the connecting cylinder and positioning block of the semi-finished product, and leave the special-shaped plate and positioning cylinder; step 7, perform finishing on the outer diameter of the positioning cylinder; step 8. Finish turning the inner diameter of the cavity and the positioning channel to form the final product. Through the above processing method, the concentricity of the cavity, the positioning channel and the upper mold core is ensured, and the eccentricity of the plastic lens 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, and the lower die core...

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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