A kind of dewaxing method of ceramic shell

Abstract

The invention discloses a method for dewaxing a ceramic mold, which includes: -before the ceramic mold with a wax pattern enters the dewaxing process, setting a thickness ranging from thin to Thick, differentiated thermal barrier;‑Place the ceramic mold with the wax pattern and thermal barrier in the dewaxing equipment, with the dewaxing port on the ceramic mold facing down, and the thermal barrier on the outside of the ceramic mold The thinnest area is at the bottom of the vertical, and the thickest area is at the top of the vertical; - After the ceramic shell with wax pattern and heat-resistant layer enters the dewaxing process, the heat-resistant layer outside the ceramic shell Control the gradual change of the wax pattern inside the ceramic shell to absorb the heat of dewaxing in the order from bottom to top, so that the wax pattern inside the ceramic shell takes the dewaxing port as the starting point of melting, and realizes the sequence from bottom to top in the order from outside to inside. Dewaxing. It can reduce or directly cancel the auxiliary dewaxing port on the ceramic shell, effectively and reliably guarantee the qualified rate and quality of the dewaxing molding of the ceramic shell.

Description

technical field [0001] The invention relates to a ceramic shell forming technology for investment precision casting, in particular to a ceramic shell dewaxing method. Background technique [0002] Investment casting, also known as lost wax casting, uses wax to make a wax mold of the part to be cast, and then dips the wax mold with slurry and sand to make a ceramic shell, and then melts and removes the wax mold inside the ceramic shell. Get the cavity that matches the part to be cast, and finally pour the molten metal into the cavity of the ceramic shell under certain process conditions to cast the casting. Castings formed by investment precision casting have technical advantages such as high precision, good surface quality, and less post-processing, so they have been widely used, especially in the molding of alloy castings that are difficult to process such as superalloys. [0003] As mentioned above, the cavity of the ceramic shell is obtained by melting and removing the w...

AI Technical Summary

Problems solved by technology

There is little research on how to control the dewaxing sequence of the wax pattern in the ceramic shell. In the disclosed prior art, there is no such thing as reducing the auxiliary dewaxing port on the ceramic shell or canceling the auxiliary dewaxing by controlling the dewaxing sequence. At the same time, the technical research results of effectively ensuring the low crack rate of the ceramic shell during dewaxing were disclosed

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