Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould

A technology of lost foam casting and vacuum lost foam, which is applied in the field of alloy precision casting and can solve problems such as unsuitability for mass industrial production, easy oxidation, and gas absorption.

Inactive Publication Date: 2002-12-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the control of the pressure regulating casting method is relatively complicated, which is not suitable for mass industrial production, and can only be used for the production of aluminum alloy castings
[0005] In addition, magnesium and aluminum alloys in the liquid state are easily oxidized and inhaled when in contact with air, and a large number of oxide impurities and pores are easily formed in the casting.

Method used

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  • Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould
  • Antigravitational vacuum method and apparatus for asting Mg allor or Al alloy with lost mould

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The melting furnace melts and refines the molten magnesium and aluminum alloy metal, and sends it into the pouring furnace through a siphon tube to keep warm and wait for pouring. The pouring furnace is filled with protective gas CO 2 , the pressure is 0.02mpa, and the vibration-tight sand box containing the foamed plastic casting pattern (lost foam) is sent to the top of the pouring table through rails or hoisting equipment, and the position is waiting for pouring. The sand box is vacuumed and then poured into the pouring furnace Inert gas CO with controlled pressure 2 , the pressure is 0.2mpa, and the vacuum degree is -0.04mpa when vacuuming, realizing anti-gravity vacuum casting. Example 2:

Embodiment 2

[0018] The melting furnace melts and refines the magnesium and aluminum alloy molten metal, and sends it into the pouring furnace through the electromagnetic pump to keep warm and wait for pouring. The pouring furnace is filled with protective gas Ar, the pressure is 0.008mpa, and the sand box is vacuumed, the vacuum degree is -0.06mpa, The inert gas that feeds into controllable pressure is also Ar, pressure 0.05mpa, other is the same as embodiment 1.

[0019] Equipment for anti-gravity vacuum casting such as figure 1 As shown, 1 is the lost foam casting pattern, 2 is the bottom injection sand box, 3 is the molding sand filled in it, 4 is the vacuum pipe for the sand box, 5 is the roller table for the mobile sand box, and 6 is the pouring platform. On the furnace cover 8 of the pouring furnace 7, 9 is the crucible, 10 is the stainless steel lining, 11 is the heating coil, 12 is the thermal insulation layer, 13 is the pouring tube, 14 is the thermal insulation heating coil, and...

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Abstract

An antigravitational casting technology includes putting a lost mould in a bottom running type sand box, adding sand, vibration compacting, loading molten MgAl alloy in filler while introducing protecting gas, introducing the pressure controllable inertial gas to the filler, and pouring the molten alloy into said sand box to gasify said list mould. Its apparatus is composed of filler, sand box, pouring pipe, crucible in the filler, and heating coil surrounding said pouring pipe. It is suitable for precision casting.

Description

technical field [0001] The invention belongs to the field of alloy precision casting, and in particular relates to an anti-gravity casting method and equipment thereof. Background technique [0002] At present, the precision casting method of magnesium alloy parts is relatively simple, and most of them are formed by pressure casting method under gravity (accounting for ~90%), while a few magnesium alloy castings formed by sand casting under gravity have poor precision and surface roughness. . There are relatively many precision casting methods for aluminum alloy parts. The commonly used ones are: metal mold casting, pressure casting and lost foam casting under gravity filling and solidification, and low pressure casting, differential pressure casting and melting casting under anti-gravity filling and solidification. Die suction casting, etc. [0003] Casting under gravity is likely to cause casting defects such as under-casting, looseness, and oxidation inclusions in casti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D18/06B22D21/04
Inventor 樊自田董选普黄乃瑜胡敏田学峰吴和保
Owner HUAZHONG UNIV OF SCI & TECH
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