Aluminium alloy or magnesium alloy evaporative-pattern casting compression solidification method and device thereof

A technology of lost foam casting and magnesium alloy, which is applied to casting molding equipment, metal processing equipment, casting molds, etc. It can solve the problems of long charging time, low pressing rate and high investment cost, and achieve high charging rate. , increase the density, the effect of less investment

Inactive Publication Date: 2009-03-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above mainly carried out the pressurized solidification method for aluminum alloy, the main disadvantages are: the sand box and the pressurized cylinder are two sets of equipment, the investment cost of the equipment is high, the time of pressurization is long, and the rate of pressurization is low; A certain automation device moves or puts the sand box into the pressurized cylinder and seals it, the process is complex
However, for the serious shrinkage porosity of magnesium alloy lost foam casting, the method of using pressure solidification to eliminate shrinkage porosity has not been reported yet.

Method used

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  • Aluminium alloy or magnesium alloy evaporative-pattern casting compression solidification method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: aluminum alloy casting

[0039]Put the foam pattern (3) of the lost foam part into the pressure-resistant sand box (2), add 20-50 mesh quartz loose sand (15), and vibrate and compact it by the vibration compacting table (1) at the same time; put the sprue cup (14); on the above-mentioned pressure-resistant sand box (2), add a cover pressure-resistant sand box cover (7), tighten the clamping mechanism (5); then ZL101 aluminum alloy is melted, after refining, metamorphism, when aluminum When the alloy temperature is 740°C, pour the molten metal into the sand box from the metal liquid introduction cup (10) preheated at 200°C on the switch valve (9); after pouring a certain amount, quickly take out the metal liquid introduction cup (10) , close the on-off valve (9) and the exhaust valve (18); the compressed air with a pressure of 1.2MPa is introduced from the intake pipe (8), the charging rate is 0.05MPa / s, the pressure is maintained for 0.3min, and then the i...

Embodiment 2

[0040] Embodiment 2: magnesium alloy casting

[0041] Put the foam pattern of the lost foam part into the pressure-resistant sand box (2), add 20-50 mesh pearl loose sand, and vibrate and compact it by the vibration compacting table (1) at the same time; cover the surface of the loose sand (15) with a plastic film, Vacuum the vacuum to -0.05MPa, then put the sprue cup (14); on the above-mentioned pressure-resistant sand box (2), cover the pressure-resistant sand box cover (7), and tighten the clamping mechanism (5) ; for AZ91D magnesium alloy, in SF 6 plus CO 2 Melting, refining and metamorphism under mixed protective gas. When the magnesium alloy temperature is 730°C, the molten metal preheated at 200°C from the on-off valve (9) is introduced into the cup (10) and poured into the pressure-resistant sandbox; Finally, sprinkle some dry sand with sulfur (anti-magnesium alloy combustion), quickly take out the molten metal into the cup (10), close the switch valve (9) and exhaus...

Embodiment 3

[0042] Example 3: Vibration of aluminum alloy and solidification under variable pressure

[0043] Put the foam pattern of the lost foam part into the pressure-resistant sandbox (2), add 20-50 mesh quartz loose sand, and vibrate and compact it by the vibration compacting table (1) at the same time; cover the surface of the loose sand (15) with a plastic film, Vacuumize to -0.01MPa, then put the sprue cup (14); on the above-mentioned pressure-resistant sand box (2), cover the pressure-resistant sand box cover (7), and tighten the clamping mechanism (5) ; A356 aluminum alloy is melted, refined and deteriorated. Open the vibrating table (1) before pouring, and carry out 50Hz micro-vibration to the sand box. The molten metal is poured into the pressure-resistant sand box in the introduction cup (10); after pouring a certain amount, quickly take out the molten metal introduction cup (10), close the on-off valve (9) and the exhaust valve (18); stop the vibration, The gas pipe (8) is...

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Abstract

The invention relates to an aluminium alloy or magnesium alloy lost mould casting pressuring solidification method and a device thereof, and the invention belongs to the field of special precision casting. The aluminium alloy or magnesium alloy lost mould casting pressuring solidification method comprises compacting, vacuuming, pouring, pressuring and depressurizing. A pressure resistant sand box of the device is a cylinder-shaped container, the bottom is provided with an exhaust valve, and the inner lower part or the side wall is provided with a ventilation interlayer; the upper surface of a cover of the pressure resistant sand box is respectively provided with a switch valve, a safety valve and a pressure gauge; and the side surface of the pressure resistant sand box or the cover of the pressure resistant sand box is provided with an intake pipe. The aluminium alloy or magnesium alloy lost mould casting pressuring solidification method can obviously reduce casting defects of shrinkage cavity, shrinkage porosity, and the like in aluminium alloy lost mould casting, can effectively reduce pinhole in the aluminium alloy, enhances density of the casting, thins alloy crystal grains, and improves the surface quality and mechanical property of the aluminium alloy or magnesium alloy lost mould casting. The device simplifies lost mould casting pressuring solidification technique, and low production cost, convenient operation, good sealing effect, short sealing time of the sand box and fast pressuring speed.

Description

technical field [0001] The invention belongs to the field of special precision casting, and in particular relates to a pressure solidification method and a device thereof for aluminum alloy or magnesium alloy lost foam casting. Background technique [0002] In 1958, H.F.shroyer of the United States invented the patented technology of manufacturing metal castings with expandable foam patterns and obtained US Patent No. USP2830343. Lost foam casting (also known as solid casting) is to bond and combine paraffin or foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding. Down pouring, the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method. The lost foam casting method has the advantages of high dimensional accuracy, low surface roughness, simple production process, and less material consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D21/04B22C9/04
Inventor 樊自田赵忠唐波潘迪成平蒋文明董选普魏必明
Owner HUAZHONG UNIV OF SCI & TECH
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