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A Method for Preventing Cracking of Ceramic Model Shell

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

Active Publication Date: 2020-09-22
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Method for Preventing Cracking of Ceramic Model 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 mold, which is characterized in that it comprises the steps of: 1) using a ceramic mold manufacturing process to prepare a ceramic mold with a certain thickness; The outer surface of the ceramic shell is covered with a certain thickness of materials that can melt during the dewaxing process or non-melting heat insulation materials along the direction of common cracks; 3) Put the ceramic shell into the dewaxing equipment and use high temperature and high pressure water vapor for dewaxing wax. The method is applicable to any part of the mold shell, so that the ceramic mold shell is no longer cracked and does not cause any impact on the mold shell and subsequent processes. The method is low in cost and high in efficiency, and greatly reduces the labor intensity of the 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 Patents(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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