A method of using cold wax block and ceramic core for wax mold pressing at the same time

Abstract

The invention relates to a method for simultaneously using a cold wax block and a ceramic core for wax mold pressing. According to the method for simultaneously using the cold wax block and the ceramic core for the wax mold pressing, the cold wax block is divided into an upper mold cold wax block body and a lower mold cold wax block body so that the complex structure of the whole mold design of the cold wax block can be avoided, the manufacturing cost can be reduced, and the size and the shape of the cold wax block can be controlled conveniently; the upper mold cold wax block body and the lower mold cold wax block body play a role in protecting the ceramic core so that problems that the ceramic core is deviated and broken due to direct strong impact of liquid wax in the wax pressing process can be avoided, and meanwhile, the upper mold cold wax block body and the lower die cold wax block body are used so as to protect the ceramic core against breakage caused by the cooling shrinkage of the liquid wax; the ceramic core is placed between the upper mold cold wax block body and the lower mold cold wax block body so that the ceramic core can be placed and positioned in a wax mold conveniently; and meanwhile, an inner cavity of a required part can be obtained, and the size problem of the thicker and larger part of the wax mold caused by large shrinkage quantity of the liquid wax can be solved.

Description

technical field [0001] The invention relates to the field of casting, in particular to a method for simultaneously using cold wax blocks and ceramic cores for wax mold pressing. Background technique [0002] In the process of precision casting, in order to form a cavity with a complex structure or a size that is difficult to obtain through casting, a ceramic core is usually used as an auxiliary. The ceramic core is the same as the required inner cavity structure. Before wax pressing, put the ceramic core into the reserved position in the mold, so that the wax mold can tightly wrap the ceramic core during the wax pressing process, thus forming a wrapped The wax model of the ceramic core, through the subsequent shell making and dewaxing, an empty mold shell containing the ceramic core is obtained. After pouring the molten metal, the molten metal wraps the ceramic core, and after cooling, it is shelled, cut, and removed. The core is removed from the ceramic core wrapped in mol...

AI Technical Summary

Problems solved by technology

For example, first, in the process of wax pressing, the position and support of the ceramic core: the position of the ceramic core in the mold directly determines its position in the wax mold, thus determining whether the cavity size of the part is qualified , how to ensure the accurate position of the ceramic core in the wax mold is very important. At present, most of the methods of supporting the ceramic core are supported by the core support, but the core support needs to be adjusted according to the size difference of each ceramic core in different positions. The height of the core support, the position of the core support and the height of the core support will all have deviations during the operation. The insufficient bonding strength of the core support will cause the core support to fall, and the core support will cause a series of problems such as fracturing of the ceramic core. ; Second, the position and strength of the ceramic core after being impacted by liquid wax: the fracture of the ceramic core in the process of wax pressing is a common problem. The more complex the ceramic core is, the greater the proportion of fracture is. Under the impact pressure of the wax, the position will be shifted or even broken; thirdly, when the thick part needs to place a ceramic core, due to the interference between the cold wax block and the ceramic core, only the ceramic core can be placed and the cold wax block should be discarded , the result of this is that the liquid wax in the thick part shrinks a lot, which leads to size problems and broken core problems due to a large amount of shrinkage and extrusion, etc.

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