Precision casting technique of ceramic shell lost foam

Abstract

The invention relates to a precise casting process for a ceramic shell lost die. The process comprises the following steps: materials are foamed once and injected in a die cavity; after dry forming, and the materials are assembly welded by spraying glue and hot melt glue to form a die set; the die set adopts quick drying silicasol to prepare a shell and is pre-roasted, the die set after pre-roasting is placed in a furnace for roasting in the shortest time so as to be dried; after the roasting of the die shell, the die shell is filled in a sand box and pumped out and compacted, waste steel and alloy steel material are placed in an intermediate frequency furnace for melting, the compositions of the molten steel are adjusted to be the same as those of the cast product, after casting, cooling and forming, the remained sand on the surface is removed; after a riser and an ingate of the cast product are removed, the cast product is placed in a heat treatment furnace for heat treatment; the sand grain and oxide skin on the surface of the cast product are removed, the riser platform is processed to be smooth, and the surface defects of the cast product are eliminated. The process has the advantages of realizing the production of cast steel products which can not be realized by the conventional lost die process, having extremely high hardness, and avoiding the problems that the carbon penetration and gas holes on the cast product are easily generated.

Description

technical field [0001] The invention relates to a ceramic shell lost foam precision casting process. Background technique [0002] The traditional lost foam casting, also known as negative compaction casting, mainly embeds the model made of foam plastic in dry sand without binder for molding, and uses microseismic and negative compaction. Liquid metal is poured into the casting and solidification process, and a certain negative pressure is maintained during the casting and solidification process to vaporize the foam plastic and then be replaced by metal to form a casting; it is characterized by one-time molding of the casting, high precision, and can greatly improve the foundry environment conditions, it is easy to realize pollution-free production, and the shape and structure of castings are not restricted, thus providing sufficient freedom for product design. The so-called investment casting process is to make a fusible model with fusible materials (such as wax or plastic...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a ceramic shell lost foam precision casting process to overcome the shortcomings of the prior art that the production of steel castings cannot be carried out, the strength is low, it is easy to cause carburization and the generation of casting pores