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

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...

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.

Images