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Method for preparing shell for investment casting and shell

A technology for investment casting and preparation steps, which is applied in the field of shell preparation for investment casting, and can solve problems such as inability to brush to areas of concern, inability to accurately control the quality of brushed slurry, uneven shell thickness, etc., to achieve shrinkage porosity The effect of reduced tendency, low cost, and uniform grain

Pending Publication Date: 2022-01-21
CHINA UNITED GAS TURBINE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method of using brushes can easily lead to uneven shell thickness.
The reason is that the quality of the brushing slurry cannot be accurately controlled, and some areas of concern may not be brushed

Method used

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  • Method for preparing shell for investment casting and shell
  • Method for preparing shell for investment casting and shell
  • Method for preparing shell for investment casting and shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing a mold shell for investment casting, comprising more than two shell preparation steps, at least part of the shell preparation steps include a slurry coating step, a sand shower step and a drying step, that is, repeated on the surface of a wax piece A plurality of shell layer preparation steps including a slurry coating step, a sand shower step and a drying step form a gradual accumulation of multiple shell layers on the surface of the wax piece. The final number of layers of the shell can be determined according to the size, shape and structure of the part.

[0043]According to the different raw materials and processes used, the shell layer preparation steps can be sequential surface layer preparation steps, transition layer preparation steps and reinforcement layer preparation steps, wherein the surface layer preparation steps, transition layer preparation steps and reinforcement layer The preparation steps can be repeated multiple times; corresp...

Embodiment 2

[0052] A method for preparing a mold shell for investment casting, comprising more than two shell preparation steps, at least part of the shell preparation steps include a slurry coating step, a sand shower step and a drying step, that is, repeated on the surface of a wax piece A plurality of shell layer preparation steps including a slurry coating step, a sand shower step and a drying step form a gradual accumulation of multiple shell layers on the surface of the wax piece. The final number of layers of the shell can be determined according to the size, shape and structure of the part.

[0053] According to the different raw materials and processes used, the shell layer preparation steps can be sequential surface layer preparation steps, transition layer preparation steps and reinforcement layer preparation steps, wherein the surface layer preparation steps, transition layer preparation steps and reinforcement layer The preparation steps can be repeated multiple times; corres...

Embodiment 3

[0063] This embodiment provides the gas turbine turbine blade shell prepared according to the method for preparing the shell for investment casting in Example 1, and the thickness of the part on the shell corresponding to the hot spot of the casting is different from the thickness of other parts of the shell The deviation is less than 30%. Preferably, the deviation of the thickness of the part on the mold shell corresponding to the hot spot of the casting is less than 20% from the thickness of other parts of the mold shell.

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Abstract

The invention provides a method for preparing a shell for investment casting. The method comprises more than two shell layer preparation steps, at least part of the shell layer preparation steps comprises the steps of slurry coating, sand spraying and drying which are carried out in sequence, at least one shell layer preparation step further comprises a local isolation step, and in the local isolation step, an isolating membrane is arranged at the position, needing thickness control, of the shell. The invention also provides the shell prepared by using the method. The ceramic shell prepared through the method is high in thickness uniformity, and shrinkage porosity and grain control of the local area of a precision casting are facilitated. The invention further relates to a gas turbine blade shell prepared by using the preparation method.

Description

technical field [0001] The invention relates to a method for preparing a mold shell for investment casting, in particular to a method for preparing a mold shell for investment casting of a turbine blade of a gas turbine. The invention also relates to the turbine blade shell of the gas turbine prepared by the preparation method. Background technique [0002] High-temperature alloy blade parts such as gas turbine blades are often prepared by investment casting. Preparation of ceramic shell is an indispensable and important link in the process of investment casting without allowance. The quality control of the mold shell, such as a series of factors such as the quality of the surface layer, the strength of the mold shell, the uniformity of the thickness of the mold shell, and the yield, can directly affect the casting pouring and solidification process. Therefore, the quality of the shell must be strictly controlled to meet the casting requirements of turbine blades with incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C13/08
CPCB22C13/085
Inventor 束国刚陆民刚刘西河宋丽文赵宇辰王尧刘心刚董加胜楼琅洪
Owner CHINA UNITED GAS TURBINE TECH CO LTD
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