Casting sand mold forming method

Abstract

The invention discloses a casting sand mold forming method. The sand mould forming method comprises the following steps of spraying precoated sand into a cavity between non-heated cold molds from a sand shooting hole in a sand box through a sand shooting pipe until the cavity between the cold molds is sprayed with the precoated sand to form a precoated sand layer, then heating the precoated sand layer in the cavity through a heating device arranged below one sides of the cold molds, and solidifying and molding the precoated sand layer in the cavity. The casting sand mold forming method has theadvantages that the method is simple, the sand amount used for making the sand mold model can be greatly reduced, the surface finish of the casting can be greatly improved, the manufacturing efficiency of the sand mold model can be improved, the labor can be greatly saved, the working environment is improved, environmental pollution cannot be caused, and the energy consumption is reduced; and thetechnology that the precoated sand is first injected into the cold model cavity, and then the precoated sand layer is heated, solidified and molded is mainly adopted, so that the heating energy consumption is saved, the heating time is shortened, and the dosage of the precoated sand is also reduced.

Description

Technical field [0001] The invention relates to the technical field of metal casting, in particular to a method for forming a sand mold for castings. Background technique [0002] At present, dry sand solid mold casting technology (vacuum lost foam casting) has been widely used in the casting field. However, in the vacuum lost foam casting process, the filling of dry sand is the key to vacuum lost foam casting. The dry sand is filled with vibration. If the seismic strength is not enough, or the filling is not solid, it will easily cause collapse of the box during casting, and the cast parts will become waste products. In response to this situation, the sand box used in the vacuum lost foam casting method for large and complex castings disclosed in the Chinese patent No. 200910074893.3 basically solves the above problems, but the sand box is a cube or a rectangular box. For some special-shaped castings, especially those with lateral lateral holes on the side of the casting, the d...

AI Technical Summary

Problems solved by technology

In addition, in the existing foundry industry, the foundry process has problems such as poor working environment, high labor intensity, large amount of sand used, and high energy consumption.

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