Low-pressure casting method and equipment thereof

A low-pressure casting and equipment technology, which is applied in the field of low-pressure casting methods and equipment, can solve the problems of unfavorable quality of castings and increased difficulty in controlling the stability of rising liquid filling molds, etc., and achieve the goals of corrosion prevention, large economic and social value, and easy operation Effect

Inactive Publication Date: 2009-08-05
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Low-pressure casting method and equipment thereof
  • Low-pressure casting method and equipment thereof
  • Low-pressure casting method and equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A low-pressure casting device with simple structure, convenient operation and good technical effect and a method for using the device to perform low-pressure casting operation.

[0038] 1) Equipment used in low pressure casting method

[0039] In the special equipment, a crucible is specifically used as the core of the equipment; the feature is that the crucible in the equipment has a structure that separates its interior and exterior into two independent parts that are not connected to each other. And always keep the pressure of the two gases basically the same, that is to say, in the process of filling and pressurizing the entire casting, pressurizing and maintaining pressure after filling, and pressure relief after the casting solidifies, the gas filled inside the crucible is required to be the same as the gas filled outside the crucible. Another gas that is fed in keeps the pressure basically equal and changes basically synchronously.

[0040] The metal liquid for ...

Embodiment 2

[0060] A low-pressure casting device with simple structure, convenient operation and good technical effect and a method for using the device to perform low-pressure casting operation.

[0061] 1) Equipment used in low pressure casting method

[0062] In the special equipment, a crucible is specifically used as the core of the equipment; the feature is that the crucible in the equipment has a structure that separates its interior and exterior into two independent parts that are not connected to each other. The low-pressure casting equipment includes a low-pressure casting pressure tank, a mold loading system, an air supply system and an integrated control system; wherein:

[0063] There is a holding furnace inside the low-pressure casting pressure tank, and there is a crucible inside the holding furnace, which is installed in the hearth of the holding furnace inside the low-pressure casting pressure tank. The gas supply system is connected to the following two parts that are re...

Embodiment 3

[0080] The content of this embodiment is basically the same as that of Embodiment 1, and the difference is mainly: the SF in the protective mixed gas charged inside the crucible 6 The volume fraction is about 0.3%.

[0081] The gas introduced into the closed space outside the crucible is nitrogen.

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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...

Claims

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Application Information

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IPC IPC(8): B22D18/04
Inventor 娄延春冯志军李玉胜闫卫平郝启堂马志毅
Owner SHENYANG RES INST OF FOUNDRY
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