Zinc-alloy USB (universal serial bus) thin-walled workpiece die-casting die structure

Abstract

The invention discloses a zinc-alloy USB (universal serial bus) thin-walled workpiece die-casting die structure. The zinc-alloy USB thin-walled workpiece die-casting die structure comprises a straight pouring runner, cross pouring runners, inner pouring runners and die cavities in sequential connection, wherein the inner pouring runners are communicated with the die cavities via inner pouring gates, cross section areas of the straight pouring runner, the cross pouring runners, the inner pouring runners and the inner pouring gate gradually decrease along flowing directions of metal liquid, an acute jet flow angle ranging from 30 to 45 degrees is formed between the direction of the metal liquid entering one of the die cavities via the corresponding inner pouring runner and a plane wherein the corresponding inner pouring gate is located, and jet flow positions of the metal liquid in the inner pouring runners are adjacent to the rear end faces of the die cavities. The zinc-alloy USB thin-walled workpiece die-casting die structure is simple in structure; directions for the metal liquid to enter the die cavities are controllable, so that flowing process of melted metal liquid entering the die cavities through a pouring system can be controlled effectively, degree of mixing with air is decreased, the metal liquid is enabled to be filled in a die well integrally, proportions of surface blistering, surface flow liners, loose structures, low strength and electrical conductivity decreasing of zinc-alloy thin-walled workpiece products are lowered, and qualified rate of products is increased.

Description

technical field [0001] The application belongs to the technical field of pouring micro thin-walled parts, and in particular relates to a zinc alloy USB thin-walled die-casting mold structure. Background technique [0002] At present, thin-walled micro-zinc alloys mainly refer to zinc alloy products with a wall thickness of 0.1mm~0.5mm. The filling speed of thin-walled micro-zinc alloy die-castings is generally about 40 m / s. Under the action of high pressure and high speed, When the molten metal enters the cavity, it is filled with the jet flow. When the filling process is subjected to continuous loss such as collision, friction, and resistance, the jet flow becomes a pressure flow. The surface quality is better, but the generation of defects, especially bubbles, is easy to appear in the part filled with pressure flow. During the production process of this kind of zinc alloy products, defects such as air bubbles and under-casting are extremely prone to occur. Therefore, rea...

AI Technical Summary

Problems solved by technology

The most common defects of zinc alloy die castings are surface blistering and loose structure, which lead to a decrease in strength and conductivity, and cannot meet the quality standards, resulting in a high defect rate and seriously affecting the normal production of the product.

What's more serious is that some defects are difficult to detect in the semi-finished products of die castings, but they will be revealed in the subsequent processing technology, such as electroplating, which will undoubtedly cause more serious losses to production

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