Casting forming method for alloy casting

Abstract

The invention provides a casting forming method for an alloy casting. The casting forming method comprises the following steps that a wax mold is prepared according to a design drawing; a refractory material is sprayed on the surface of the wax mold, and roasting is conucted on the wax mold to obtain a mold shell; bauxite with the fine granularity of 100#, bauxite with the fine granularity of 60# and silica sol are uniformly mixed according to the mass ratio of 10 to 4 to 1 to obtain sol sludge; a metal heat dissipation piece is prepared and the metal heat dissipation piece is fixedly connected to the surface of the mold shell through the sol sludge; and an alloy material smelted into the liquid state is poured into the mold shell, and the casting is obtained after the alloy material is condensed and solidified. According to the technical solution, after the mold shell is prepared, the heat dissipation piece is fixedly connected to the mold shell, the situation that surface materials of the heat dissipation piece are mixed in the casting after the heat dissipation piece is heated and oxidized is avoided, the slag inclusion defect of the casting is avoided, the metal heat dissipation piece is fixedly connected to the surface of a boss or a convex rib of the mold shell more reliably and stably by using the self-made sol sludge, the connection of the metal heat dissipation piece and a mold shell boss or a protrucing rib is more reliable and steady, it is ensured that in the alloy material pouring process, the metal heat dissipation piece plays a corresponding heat dissipation role, and the casting forming quality is improved.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to an alloy casting casting forming method. Background technique [0002] The casting process is suitable for the production of castings with complex shapes, high surface accuracy and dimensional accuracy. The process is complex and there are many uncontrollable factors. Precision casting has a wide range of applications in aviation, aerospace, weapons, electronics, ships and other industries. With the continuous development of casting technology, the shape of castings is becoming more and more complex. The technical requirements for casting products It is also getting higher and higher. Then, for some castings with complex shapes, since the surface of the casting is provided with bosses or ribs, when the molten alloy material is poured into the mold shell to form the casting, the temperature of the alloy material itself is extremely high. High, so that the alloy materia...

AI Technical Summary

Problems solved by technology

The process is complex and there are many uncontrollable factors. Precision casting has a wide range of applications in aviation, aerospace, weapons, electronics, ships and other industries. With the continuous development of casting technology, the shape of castings is becoming more and more complex. The technical requirements for casting products It is also getting higher and higher. Then, for some castings with complex shapes, since the surface of the casting is provided with bosses or ribs, when the molten alloy material is poured into the mold shell to form the casting, the temperature of the alloy material itself is extremely high. High, so that the alloy material is not easy to dissipate heat at the corresponding position of the shell with bosses or ribs, or prone to heat concentration effect, resulting in shrinkage deformation of the final casting at the corresponding position, affecting the molding quality of the casting

In the prior art, in order to solve the above technical problems, an appropriate heat sink is usually placed on the surface of the shell. However, if the heat sink is fixedly connected to the wax model, the heat sink is also heated and oxidized while the shell is prepared by firing. In the pouring process of alloy materials, the cooling parts did not play the proper role of heat dissipation. Instead, the surface material of the cooling parts was mixed with the casting after being heated and oxidized, resulting in slag inclusion defects in the casting. If the shell is fixed, because the wall of the shell is thin, the heat sink and the shell are not easy to be firmly connected, and the heat sink is easy to detach during the pouring process of the alloy material, and the heat sink does not have the proper heat dissipation effect, which affects the molding of the casting. quality

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