Casting method for rapid casting of large precision castings based on 3D printing technology

Abstract

The invention relates to the technical field of metal molding and casting, in particular to a method for quickly casting a large precision casting based on a 3D printing technology; through combination of a 3D printing and molding technology and a lost foam casting technology, by using special shell type coatings, a casting without the defects of recarburization, pores, slag inclusion or wrinkledskin can be cast, and the requirements of a high grade and complex structure and the precision casting can be met; and the method has the advantage of green, environmental protection and no pollution.The method comprises the steps of three-dimensional modeling, making of a fusible model and a special shell mold, boxing of the shell mold, negative pressure pouring and the like. The method has theadvantages of simple processing technology, no need of developing a mould, short production time, easy regulation and modification, low production cost, green, environmental protection and no pollution, and the molding process can be finished in real time; the requirements of individualization and customization cam be met; high quality products can be made, and massive casting and precision casting are both taken into consideration.

Description

technical field [0001] The present invention relates to the technical field of metal forming casting, especially relates to the combination of 3D printing forming technology and lost foam casting technology, using special shell coating, which can cast high-quality products without carburization, pores, slag inclusions, wrinkled skin and other defects. Castings, which can meet the requirements of high-end, complex structures, and precision castings, are green, environmentally friendly, and pollution-free casting methods based on 3D printing technology for rapid casting of large precision castings. Background technique [0002] In the existing lost foam casting technology, the foam plastic white mold is usually coated with 1~2 coats of paint to form a coating with a thickness of about 1 mm, and then the coating is dried and covered with the white mold and buried (packed) into a special sand box together. , fill the dry sand and vibrate the shape, under the negative pressure st...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the complex production and processing technology of the white mold existing in the existing lost foam casting process, and the cost of developing the mold is high, time-consuming, and difficult to adjust and modify, so it is not suitable for making samples or other customized casting products. There are defects in the internal quality of castings, it is difficult to produce high-quality products, and the problems of large-scale and fine casting cannot be taken into account. However, the production and processing process of fusible molds is simple, no need to develop molds, short production time, convenient adjustment and modification, and low production costs. It can cast high-quality castings without defects such as carburization, pores, slag inclusions, and wrinkled skins, and can meet the requirements of high-grade, complex structures, precision, and customized castings. It is green, environmentally friendly, and pollution-free. Rapid casting of large-scale castings based on 3D printing technology Casting method of precision castings