Investment mold centrifugal casting method with plugging device for mold shell dewaxing port and its device

Abstract

The invention discloses an investment centrifugal casting method and an investment centrifugal casting device used for a formwork dewaxing port and having a plugging device. The device comprises a ceramic end cap and an outer thread wax pattern with the shape and size identical to those of the end cap. The method comprises the following steps: making a wax pattern and making the ceramic end cap and the outer thread wax pattern matched with the wax pattern according to conventional technical conditions; bonding the outer thread wax pattern to the bottom of a die frame of the wax pattern and then coating to make a formwork, and cutting off the coating layer on the surface of one end, far away from the frame, of the outer thread wax pattern; then carrying out steam dewaxing and high temperature roasting, and plugging the ceramic end cap and a dewaxing port part of the roasted formwork; and carrying out centrifugal casting after plugging. According to the invention, by adopting the ceramic end cap in thread match, casting defects caused by loosening or falling-off of the end cap are avoided during operation and casting; gas forming amount of the formwork is reduced, and pores in the surface of a cast titanium alloy casting are obviously reduced; and since the operation process is simple and effective, influences of foreign elements are reduced, and the internal metallurgical quality of castings is remarkably improved.

Description

technical field [0001] The invention relates to the field of centrifugal casting, in particular to an investment centrifugal casting method with a plugging device at a dewaxing port of a mold shell and a device thereof. Background technique [0002] Because titanium alloy investment centrifugal casting is to use wax material to reproduce the wax mold with the same shape as the casting, and then assemble the upper gating system to form a wax mold module, and place several dewaxing ports at the bottom of the wax mold module. Then coat the sand and powder of multi-layer refractory material on the wax model group (this process is called coating). After the coating is dried, dewaxing treatment is required, that is, the wax mold is subjected to dewaxing treatment in a high-temperature and high-pressure dewaxing kettle, but this process needs to remove the wax through the dewaxing port; after the mold shell is roasted at high temperature, it needs to be dewaxed The mouth is sealed...

AI Technical Summary

Problems solved by technology

In the early stage of sealing and plugging, the ceramic plug with a slope and the water glass adhesive have been used together. However, in the actual operation process, due to the error of manual operation and the inability to judge whether it is good or bad after sealing, it is often used during transportation. During the pouring process, the casting is scrapped due to the loosening of the part and the defect of the gunfire

Therefore, if the problem of plugging the dewaxing port of the mold shell is not completely solved, it will directly affect the internal metallurgical quality of the casting and the pouring and forming of the casting.

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