Water glass fiber reinforced plastic sand casting mold and preparation method

Abstract

The invention relates to casting, in particular to a water glass fiber reinforced plastic sand casting mold and a preparation method. According to the water glass reinforced plastic sand casting mold, crude sand is steel sand, and the steel sand is bonded and shaped through water glass. The preparation method of the water glass fiber reinforced plastic sand casting mold comprises the following steps: A, sand preparation; b, preparing of a model and a sand box; c, sand mixing; d, modeling; d, casting mold hardening; and E, demolding. The cast steel grit is high in heat storage coefficient and heat conductivity coefficient, the chilling capacity is enhanced, and the obtained casting is fine in crystal structure, compact in texture, excellent in mechanical property, high in production efficiency and low in production cost; and the steel grit is recycled, compared with mineral sand, consumption of natural resources is reduced, generation of a large amount of solid waste sand is avoided, and energy conservation and environmental protection are achieved.

Description

Technical field [0001] The present invention relates to a casting, more particularly to a mold and a method for preparing water glass grit. Background technique [0002] Currently, the main material commonly used in the foundry sand and other minerals quartz sand as the mold, having high refractoriness, widely available, etc., however, mineral sand poor thermal conductivity in the liquid metal solidification process, due to insufficient cooling rate, difficult to obtain a fine grain structure, according to the equation hall-petch, polycrystalline metal strength and inversely proportional to the square root of grain diameter, is cast to obtain a high strength castings need to refine tissue, using tissue making mineral sand mold is difficult to obtain highly refined, . To increase the cooling rate, sand is often used in topical or directly added to a cold iron mold metal approach, while adding cold iron available in fine grain near the chill surface of the casting, but in general i...

AI Technical Summary

Problems solved by technology

[0002] At present, foundry manufacturers generally use mineral sand such as quartz sand as the main material of the mold, which has the advantages of high refractoriness and wide range of sources. However, mineral sand has poor thermal conductivity. Crystal structure, according to the hall-petch formula, the strength of polycrystalline metals is inversely proportional to the square root of the grain diameter, that is, to obtain high-strength castings, it is necessary to refine the structure of the casting, and it is difficult to obtain a highly refined structure by using mineral sand to make molds.

In order to increase the cooling rate, it is often used to add chilled iron blocks in the molding sand or directly use the metal casting method. Although adding chilled iron can obtain fine grains on the surface of the casting close to the chilled iron, it is generally to control the solidification sequence. Then control the appearance of shrinkage cavity and shrinkage porosity to obtain a complete casting, and the overall fine graining of the casting cannot be achieved; and metal mold casting, because the metal liquid is directly poured into the metal cavity, directly contacting the inner wall of the metal mold, the inner wall There is only a thin layer of paint on the surface, and repeated pouring of high-temperature molten metal will cause thermal melting loss, fatigue, cracking, etc. of the mold, the life is limited, and the operating cost is high, especially for those with simple shapes, large batches, and single weight. Small castings and therefore limited

In addition, there is also the practice of filling steel shots in shell casting and lost foam magnetic casting. However, loose steel shots are added, and no binder is attached. The cooling rate of the shell mold is low, and the lost foam magnetic mold requires an external magnetic field. , on-site production conditions are complex

Images