A kind of dewaxing method of ceramic shell

A ceramic type and dewaxing technology, which is applied in the direction of core, casting mold, casting mold composition, etc., can solve the problems of low crack rate, improve the pass rate and quality, ensure low crack rate, and delay the conduction of dewaxing heat Effect

Active Publication Date: 2020-06-16
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A kind of dewaxing method of ceramic shell

Examples

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Effect test

Embodiment 1

[0024] see figure 1 Shown, the present invention is the ceramic shell dewaxing method that gas turbine blade investment casting is used, and it comprises following process measure:

[0025] - making a ceramic shell 3 with a wax pattern 1 that meets the technical requirements of the dewaxing process, and there is no auxiliary dewaxing port structure design on the ceramic shell 3;

[0026] Before the ceramic shell 3 with the wax pattern 1 enters the dewaxing process, the sprue cup 2 on the ceramic shell 3 is used as the dewaxing port, and the dewaxing port (i.e. the sprue cup 2) is used on the outside of the ceramic shell 3 ) as the starting point to set a heat-resistant layer 4 with a thickness ranging from thin to thick. Specifically: starting from the outside of the dewaxing port of the ceramic shell 3, the melting point is lower than that of the wax mold 1 inside the ceramic shell 3. And after burning off, an amorphous meltable substance with minimal ash remaining outside t...

Embodiment 2

[0032] The present invention is the dewaxing method of the ceramic shell that gas turbine blade investment casting is used, and it comprises following process measure:

[0033] - Manufacture a ceramic shell with a wax pattern that meets the technical requirements of the dewaxing process, and there is no auxiliary dewaxing port structure design on the ceramic shell;

[0034]Before the ceramic shell with wax pattern enters the dewaxing process, the sprue cup on the ceramic shell is used as the dewaxing port, and the thickness is set at the outside of the ceramic shell starting from the dewaxing port (that is, the sprue cup) It is a differentiated heat resistance layer from thin to thick, specifically: starting from the external root at the dewaxing port of the ceramic shell, the melting point is lower than the wax pattern inside the ceramic shell, and after burning out, it is on the outside of the ceramic shell Amorphous meltable substance with minimal residual ash-preferably mi...

Embodiment 3

[0040] The present invention is a method for dewaxing ceramic mold shells for the investment casting of turbine blades of aero-engines, which comprises the following technological measures:

[0041] - Manufacture a ceramic shell with a wax pattern that meets the technical requirements of the dewaxing process, and there is no auxiliary dewaxing port structure design on the ceramic shell;

[0042] Before the ceramic shell with wax pattern enters the dewaxing process, the sprue cup on the ceramic shell is used as the dewaxing port, and the thickness is set at the outside of the ceramic shell starting from the dewaxing port (that is, the sprue cup) It is a differentiated heat-resistant layer from thin to thick, specifically: starting from the outside of the ceramic shell dewaxing port, the melting point is lower than the wax pattern inside the ceramic shell, and it remains outside the ceramic shell after burning out Amorphous meltable substance with minimal ash content-preferably ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/12B22C9/04
CPCB22C9/04B22C9/12
Inventor 曾洪伍林张松泉杨功显杨照宏巩秀芳赵代银何建
Owner DONGFANG TURBINE CO LTD
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