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Method for preventing cracking of ceramic shell

A ceramic mold and crack technology, applied in the direction of casting mold, core, casting mold composition, etc., can solve the problem that the dewaxing port cannot use the non-processing position, etc., and achieve the effect of saving financial resources, significant economic benefits, and easy implementation.

Active Publication Date: 2017-06-16
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively reduce the probability of shell cracking, but the dewaxing port cannot be used in non-processing positions of castings with high precision requirements such as turbine blades

Method used

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  • Method for preventing cracking of ceramic shell

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Embodiment Construction

[0024] Such as figure 1 As shown, taking investment casting precision casting of gas turbine turbine blades as an example, the method for preventing cracking of the ceramic shell includes the following steps:

[0025] 1) A ceramic shell 2 with a certain thickness is manufactured by adopting the manufacturing process of the ceramic shell 2 .

[0026] The specific operation of this step is as follows:

[0027] a. After heating the medium-temperature wax material to 62°C with a wax press machine, inject the wax material into the metal mold of the turbine moving blade of the gas turbine under an injection pressure of 6 bar, and take out the wax material after cooling to obtain the wax mold 1 of the turbine moving blade;

[0028] b. Using the same process as step a to suppress the wax mold of the gating system;

[0029] c. Assemble the turbine moving blade wax mold 1 and the gating system wax mold with electric welding knife and other tools to make a wax tree;

[0030] d. Bond t...

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Abstract

The invention discloses a method for preventing cracking of a ceramic shell. The method for preventing the cracking of the ceramic shell is characterized by comprising the following steps: 1) adopting a fabrication process of the ceramic shell to obtain the ceramic shell with a certain thickness; 2) covering a certain thickness of materials which can melt or thermal insulation materials which cannot melt in the dewaxing process on the outer surface of the ceramic shell which has a crack easily occurring part in the common crack direction; 3) putting the ceramic shell into a dewaxing device, using high-temperature and high-pressure steam to perform dewaxing. The method is suitable for any parts of the shell, so that the ceramic shell no longer cracks, thereby not having any impact on the shell and the subsequent process, and the method requires low cost, has high efficiency and greatly reduces the labor intensity of an operator.

Description

technical field [0001] The invention relates to the field of investment precision casting, in particular to a method for preventing ceramic shells from cracking. Background technique [0002] Due to its high precision and good surface quality, investment casting has been widely used since the 1980s, especially for alloys that are difficult to process, such as superalloys, investment casting has become a commonly used forming method. [0003] The investment casting process includes wax pressing, tree formation, shell making (including slurry dipping, sand showering, dewaxing and burning residual wax, etc.), pouring and post-processing, etc. The process is extremely complicated. Among them, the shell-making process is a key link, and many casting defects come from this process. In the shell-making process, cracks are a common type of shell defect, which may lead to steel breakout during pouring, deformation of castings, and seams. [0004] At present, the common methods to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
CPCB22C9/04
Inventor 曾洪伍林张松泉何建赵代银杨照宏杨功显
Owner DONGFANG TURBINE CO LTD
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