Investment casting method by use of entity shell making

Abstract

The invention discloses a method for an investment casting method by use of entity shell making, comprising the following steps: A) making mold, wherein a special entity is adopted and a chemical method is adopted to fix the form of the entity, the surface of the entity is hardened to reach a certain strength so that the entity is taken as a mold for investment casting, and the entity is assembled with a wax pattern according to process requirements so as to form a mold string; B) making shell and removing the entity, wherein a dewaxing kettle is adopted to remove the mold wax part in the mold string, a chemical method is adopted to melt and clear away part of the entity, shell roasting is carried out to burn residual mold wax and the entity into ash, and then clear water and compressed air are used for repeatedly cleaning the inner cavity of the shell so as to remove residual slags; and C) roasting and pouring. According to the investment casting method by use of entity shell making, the mold making is simple, the cost is greatly reduced, the forms of crafts are vivid, uniqueness is realized, the method can be applied to multiple complex entities, molds of which are difficult to make, and the cast crafts can have size, expression and features the same as those of the entity, so that the crafts are more realistic.

Description

technical field [0001] The invention relates to a solid shell investment casting method. Background technique [0002] Traditional handicraft investment casting mainly includes four processes: mold making, shell making, pouring and post-processing. Among them, the molding process is mainly plaster mold, and the specific process is as follows: First, take enough plaster to carve according to the design requirements to achieve the final shape of the handicraft; then use rubber to use plaster as the inner cavity, invert the model, take out the plaster after molding, and form A rubber mold with the same cavity and plaster shape; then use the rubber mold to make a wax mold, and then use the investment casting method to assemble and make the shell; after the shell is made, it can be steam dewaxed or boiled according to the material of the wax mold The method of dewaxing can remove most of the model wax; finally put the dewaxed shell into the roasting kiln to roast to remove the r...

AI Technical Summary

Problems solved by technology

Among them, the molding process is mainly plaster mold, and the specific process is as follows: First, take enough plaster to carve according to the design requirements to achieve the final shape of the handicraft; then use rubber to use plaster as the inner cavity, invert the model, take out the plaster after molding, and form A rubber mold with the same cavity and plaster shape; then use the rubber mold to make a wax mold, and then use the investment casting method to assemble and make the shell; after the shell is made, it can be steam dewaxed or boiled according to the material of the wax mold The method of dewaxing can remove most of the model wax; finally put the dewaxed shell into the roasting kiln to roast to remove the remaining residual model wax. This method requires a variety of shapes and types due to the crafts, and each plaster mold only It can make handicrafts of the same shape, and the plaster carving takes a long time and the cost of the mold is high

Complex and difficult-to-part molds are more difficult to make