Fusible mold precision casting method

Abstract

The invention discloses a fusible mold precision casting method which comprises the following steps: preparing a wax mold of a product and welding the wax pattern and a pouring system to obtain a module; coating the outer surface of the module with a refractory material, manufacturing a molding shell, enabling the manufactured molding shell to enter a dewaxing process so as to dewax; roasting the dewaxed molding shell, wherein the roasting temperature is 800-900 DEG C, and the roasting time is 2-3 h; filling the roasted molding shell into a sand box, and then adding sand to carry out vibrating compaction; conveying the sand box subjected to vibrating compaction to a pouring position, abutting a vacuum line with an abutting port of the sand box before pouring, starting a vacuum system to vacuumize the sand box, pouring product alloy liquid into the pouring system, enabling the product material alloy liquid to enter the molding shell formed after product model roasting from a pouring cup of the pouring system, and cleaning after the product material alloy liquid is cooled and condensed so as to obtain a casting. The fusible pattern precision casting method has the advantages that defects of bump, shrinkage cavity, shrinkage porosity and the like in the surface of the casting can be avoided, and the casting dimension is relatively stable.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to an investment precision casting method. Background technique [0002] As a traditional casting process, investment investment casting has the advantages of smooth surface and high dimensional accuracy of cast products, but it has the disadvantage of many manufacturing processes, especially the existence of molding processes, which increases labor intensity and increases manufacturing costs. And because the molding process of investment precision casting is simply to bury the mold shell with molding sand, the supporting strength and hardness of the molding sand are very poor, resulting in defects such as bulges, shrinkage cavities, and shrinkage of castings after pouring, and the quality of castings Low yield has always been a difficult problem for investment casting. [0003] In addition, at present, about 80% of domestic investment casting enterprises still use the w...

AI Technical Summary

Problems solved by technology

[0002] Investment casting, as a traditional casting process, has the advantages of smooth surface and high dimensional accuracy of cast products, but there are many defects in the manufacturing process, especially the existence of the molding process, which increases the labor intensity and increases the manufacturing cost.

And because the molding process of investment precision casting is simply to bury the mold shell with molding sand, the supporting strength and hardness of the molding sand are very poor, resulting in defects such as bulges, shrinkage cavities, and shrinkage of castings after pouring, and the quality of castings Low yield has always been a difficult problem for investment casting

[0003] In addition, at present, about 80% of domestic investment casting enterprises still use the water glass process to produce, and the strength of the mold shell is low, which leads to the defects of casting deformation and low dimensional stability, which are also difficult for many enterprises in this industry to control. The problem

Images