Vacuum shell model mold and shell model forming method

Abstract

The invention discloses a vacuum shell model mold and a shell model forming method. The vacuum shell model mold comprises a cover plate, a shell model stock bin, a shell model back film, a shell model surface film, a vacuum negative-pressure sand box and a mold model plate, wherein the shell model stock bin is located in the vacuum negative-pressure sand box; an inner sand box flange is arranged at the lower end in the vacuum negative-pressure sand box, the left side of the inner sand box flange is connected with the vacuum negative-pressure sand box, an outer positioning flange is arranged at the lower end of the outer surface of the shell model stock bin, and the lower end of the outer positioning flange is in contact with the upper end surface of the inner sand box flange; and a sand inlet is formed in the shell model back film, the shell model back film is fixed at the lower end of the shell model stock bin, and the shell model back film, the inner sand box flange and the shell model surface film are matched to form a model shell cavity; and a heating module is arranged on the lower end surface of the mold model plate. According to the vacuum shell model mold, the shell model can be thinned and enlarged, so that a produced casting can be relatively large and heavy, and the problem of small size and lightness of the casting casted by virtue of a model shell are solved; and meanwhile, by utilizing a novel inorganic binder, the pollution problem of the shell model and the recycling problem of waste sand are solved.

Description

technical field [0001] The invention relates to the technical field of casting molding, in particular to a vacuum shell mold and a shell molding method. Background technique [0002] The existing shell molding process usually adopts the molding sand containing binder to make a shell with a certain thickness (usually 8-20mm), and then molds the casting process; this method has the following problems: 1. The shell area is small , the weight of the castings produced is generally limited to tens of kilograms. Since the thickness of the shell is generally 8-20mm, limited by the thickness and strength of the shell, the length and width of the shell are generally limited to within 500*500mm, and the weight of the cast castings is limited to Within tens of kilograms, it is difficult to produce castings with large size and weight; 2. It is difficult to recycle the old shell sand, because the shell sand is mostly coated sand, and the old sand has many residues, which needs to be proce...

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Problems solved by technology

[0002] The existing shell molding process usually adopts the molding sand containing binder to make a shell with a certain thickness (usually 8-20mm), and then molds the casting process; this method has the following problems: 1. The shell area is small , the weight of the castings produced is generally limited to tens of kilograms. Since the thickness of the shell is generally 8-20mm, limited by the thickness and strength of the shell, the length and width of the shell are generally limited to within 500*500mm, and the weight of the cast castings is limited to Within tens of kilograms, it is difficult to produce castings with large size and weight; 2. It is difficult to recycle the old shell sand, because the shell sand is mostly coated sand, and the old sand has many residues, which needs to be processed by professional sand treatment equipment , In addition, the production of coated sand also requires professional equipment, so it is difficult for most foundries to process sand and repeat coating by themselves, but then transport it to the coated sand production enterprise, the freight is high, so it is difficult to reuse the old sand; 3. Coating The sand casting process produces a lot of harmful gases. Since the coated sand uses organic resin as a binder, it will decompose and produce harmful gases in a high-temperature casting environment; 4. The cost of shell casting is high, and the coated sand uses resin as a binder. The price is higher, and the old sand is difficult to reuse, so the cost is higher

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