Sand mould vacuum pressure casting technology and equipment

Abstract

The invention provides a sand mold vacuum pressure casting process. The main feature is to use sand as raw material, use resin or mix well, shape, repair, temperature aging, clamp and position the sand mold, put the melt, pouring cup, and sand mold in the casting tank, and then vacuumize it before working Then cast and pressurize to cool and solidify to achieve a compact casting structure. After releasing the pressure, open the door to take the sand mold, and get the blank after sand cleaning. The present invention also provides a sand mold vacuum pressure casting equipment. The sand mold base, sand mold, castings, pouring cups, ladles, and molten metal are all packed in a casting tank, and the door is closed to form a system. Operated according to the process, the peripheral equipment of the casting tank is There are pressure gauges, negative pressure gauges, vacuuming, pressurizing and exhausting devices. Using this technology avoids the phenomenon of shrinkage and thermal cracking of castings, avoids pores and defects in castings, and completely feeds to form high-density castings. It is suitable for the production of high-strength, air-tight, leak-proof castings and high-pressure parts, high precision and high density. , high-stability main components, high-quality scientific research and military supporting products, the prospect of popularization and application is very broad.

Description

Technical field: [0001] The invention relates to a sand casting process and equipment, which is especially suitable for the production of high-density and high-quality casting products. Background technique: [0002] In the existing casting process, the cost of ordinary sand casting is low. The production cycle is short, but the density (pinhole degree) and casting quality of the casting cannot be guaranteed, which cannot meet the supporting requirements of scientific research and military products; the die-casting process requires expensive steel molds, and the production cycle is long, and the pores of the casting cannot be guaranteed. Elimination; gypsum precision castings can basically meet the technical requirements of users. However, plaster-type precision casting requires expensive high-precision metal molds. The baking time of gypsum molding is as long as more than 50 hours, and the energy consumption is huge. Because the gypsum type does not have the function of ...

AI Technical Summary

Problems solved by technology

However, the overall material consumes too much processing time, the production cycle is too long, and due to the poor stability of the cold-worked material structure, for some precision thin-walled parts, it often occurs that the parts are scrapped due to deformation at the end of processing.

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