Low-pressure casting method and equipment thereof

Abstract

The invention relates to a method for low-pressure casting. A crucible is a core device which is divided into an inner space and an outer space independent of each other in the crucible, gases are passed into the two spaces, and the pressures in the two spaces are basically kept equal to each other and are changed synchronously basically. The device used in the method for the low-pressure casting particularly uses the crucible as the core device; and the device is provided with a structure which separates the inner part and the outer part of the crucible into two independent parts that are not communicated with each other and can be sealed relatively. The method is particularly suitable for the low-pressure casting of a magnesium alloy and can prevent a heating element from being eroded by SF6; a low-cost silicon series refractory material can be used in a hearth; a device used in the method has the advantages of simple structure, convenient operation and good technical effect; the used casting method has a simple process and performs works in terms of a special device; and the method has greater economic and social values.

Description

Technical field: [0001] The invention relates to casting technology, and in particular provides a low-pressure casting method (especially involving magnesium alloy casting) and equipment. Background technique: [0002] In the existing technology, magnesium alloy has many outstanding advantages that traditional conventional materials do not have: light weight, its density is about 1.78-1.82, which is 64% of aluminum alloy and 23% of steel; good specific strength and rigidity; magnesium alloy At the same time, it has a good ability to absorb vibration; in addition, magnesium alloy has high thermal conductivity, non-toxicity, non-magnetism, and strong shielding ability against electromagnetic interference. These characteristics of magnesium alloy can well meet the requirements of aerospace and military products for weight reduction, noise absorption, shock absorption, and radiation protection. At the same time, magnesium alloys are being used more and more widely in the fields...

AI Technical Summary

Problems solved by technology

This method is limited by the internal volume of the pneumatic pump, so it is only suitable for the production of small castings, and because the horizontal cross-sectional area of ​​the magnesium liquid in the pump is much smaller than the area of ​​the magnesium liquid surface in the crucible, the drop height of the magnesium liquid level in each casting is much greater than that of the crucible. It greatly increases the difficulty of controlling the smoothness of liquid filling, which is unfavorable to ensure the quality of castings

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