Die-casting process for roller support of washing machine

Abstract

The invention provides a die-casting process for a roller support of a washing machine. The die-casting process comprises the steps of low-speed injection, high-speed injection, pressurization, die opening, ejection, ejection delay and stroke returning; the speed of the low-speed injection is 0.25 m / s; the speed of the high-speed injection is 0.5 m / s; the starting point of the high-speed injection is 400 mm; the thickness of an inner sprue is 5.2 mm; the pouring temperature is 680-690 DEG C; the thickness of a scum riser opening is 2.3 mm; the fit tolerance of an ejection rod is 0-0.015 mm. By means of the die-casting process for the roller support of the washing machine, air is prevented from being drawn into molten metal, and therefore the special requirements of a support product that the air hole ratio is low, the heat treatment can be conducted, and the strength is high can be met.

Description

technical field [0001] The invention relates to a die-casting process of a washing machine roller bracket, which belongs to the technical field of machinery. Background technique [0002] Die casting is a fast-growing special casting method with less cutting and no cutting in modern metal processing technology. It is the process of filling the mold with molten metal at high pressure and high speed, and crystallizing and solidifying under high pressure to form a casting. High pressure and high speed are the main characteristics of die casting. The commonly used pressure is tens of megapascals, the filling speed (inner gate speed) is about 16-80 m / s, and the time for the liquid metal to fill the mold cavity is extremely short, about 0.01-0.2 seconds. [0003] Because the products produced by this method have the advantages of high production efficiency, simple process, high tolerance level of castings, good surface roughness, high mechanical strength, can save a lot of mecha...

AI Technical Summary

Problems solved by technology

[0004] In the traditional high-pressure casting process of the washing machine roller bracket, the alloy liquid is ejected from the gate at a high speed during die-casting, so it is inevitable that the air will be entangled and easily form pore defects, which will reduce the strength of the product, which makes it difficult for traditional die-casting to meet the strength requirements. higher product