Novel casting molding sand

Abstract

The invention discloses novel casting molding sand. The novel casting molding sand comprises the following raw materials of, in parts by weight, 1250-1310 parts of reclaimed sand, 5-35 parts of freshsand, 10-15.6 parts of molding sand adhesives, 13-15.4 parts of dust, 4-9 parts of coal powder, 1-5 parts of starch, 2-8 parts of olivine sand and 3-8 parts of apatite powder. According to the novel molding sand, the thickness degree of sand grains can be changed, the compactness of a sand mold is ensured, the air permeability of the molding sand is effectively reduced, meanwhile, the fire resistance and the plasticity of the molding sand can be ensured, in addition, the casting dust is added again and used, so that the problem of the casting roughness is solved, the problem that no place canbe used for processing the dust due to the fact that the environment-protecting situation is severe is also solved, the production cost is greatly reduced, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of foundry sand, in particular to a novel foundry sand. Background technique [0002] Sand casting refers to the casting method of producing castings in sand molds. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting methods. Because the molding materials used in sand casting are cheap and easy to obtain, the casting molds are easy to manufacture. It can be adapted to piece production, batch production and mass production. It has been the basic process in casting production for a long time. [0003] At present, in the casting process, after the introduction of cold core technology, with the continuous increase in the use of cold core (grain size 50 / 100), the particle size of reclaimed sand will become coarser, and the corresponding molding sand will have greater air permeability. It affects the surface roughness of castings. In order to solve this problem, the operator added new ...

AI Technical Summary

Problems solved by technology

[0006] However, Comparative Document 1 and Comparative Document 2 mainly improve the composition of reclaimed sand, and do not improve how to reduce the particle size of reclaimed sand after use. In addition, they do not help in the availability of casting dust after casting, and cannot solve the problem. The problems of rough casting surface and casting dust pollution, for this reason, we propose a new type of foundry sand to solve the above problems