Vacuum negative-pressure casting process capable of ensuring casting quality of roll collar

Abstract

The invention discloses a vacuum negative-pressure casting process capable of ensuring the casting quality of a roll collar, belongs to the technical field of vacuum negative-pressure casting, and is applicable to improvement on the casting quality of the roll collar of a furnace bottom roll of a steel rolling heating furnace. According to the technical scheme, an EPS (expandable polystyrene) foam plastic model is wrapped with waste-based bauxite model coating; the EPS foam plastic model buried in dry sand is burnt off before molten steel is poured, so that a solid mold is changed into a hollow coating shell; carbon elements in a solid mold model are prevented from entering a casting body in the pouring process and then the pouring of the molten steel is completed, so that the problem of recarburization on a low-carbon casting, caused by the EPS foam plastic model, is thoroughly solved, and the defects of pore forming, impurity carrying and the like of the casting are greatly reduced. By using the vacuum negative-pressure casting process, the quality is high, the efficiency is high, the cost is low, the operation is easy, the quality of a casting product is improved, the problems existing in a vacuum negative-pressure solid mold casting technology for a long time are solved, and the process is a new method for producing a high-additional-value alloy casting, has a giant business value, and is worthy of popularization and application in the industry.

Description

technical field [0001] The invention relates to a vacuum negative pressure casting method for a bottom roll ring of a steel rolling heating furnace, and belongs to the technical field of vacuum negative pressure casting. Background technique [0002] In the production equipment of iron and steel metallurgical industry, the consumption of long-life, high-temperature-resistant and wear-resistant high-alloy casting products is increasing day by day. In the past, the casting of these products generally adopts traditional wax mold casting and centrifugal casting. The common point of traditional wax mold casting and centrifugal casting methods is that the casting efficiency is low and the cost is high. Wax casting can only be poured individually, and centrifugal casting has a very large processing volume, which cannot meet the needs of production development. [0003] At present, the casting method commonly used in precision casting is "vacuum negative pressure compact casting te...

AI Technical Summary

Problems solved by technology

It is found in use that the disadvantage of this vacuum negative pressure compact casting technology is that during the process of high-temperature molten steel gasifying EPS foam, the carbon element in EPS foam will enter the casting body after contacting with molten steel, and will The carbon increase is 0.1-0.3%, and the distribution is uneven, which greatly affects the quality of castings and reduces the service life of castings