Method for forming inner cavity of high-temperature alloy hollow guide vane

A high-temperature alloy, hollow-guided technology, applied to casting molding equipment, cores, molds, etc., can solve problems such as uneven wall thickness, recrystallization restrictions, etc., to reduce production costs, reduce recrystallization tendency, and easy to control Effect

Pending Publication Date: 2022-06-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of gas turbine power and operating temperature, the demand for larger-sized superalloy hollow guide vanes (the size range of guide vanes is: length ≥ 100mm, width ≥ 60mm, height ≥ 35mm) is also increasing, but large-size hollow In the actual production process of guide vanes, defects such as stress cracks, eccentric cores, leaky cores, uneven wall thickness, recrystallization and inclusions have always been the main problems that limit the qualified rate of blade production.

Method used

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  • Method for forming inner cavity of high-temperature alloy hollow guide vane
  • Method for forming inner cavity of high-temperature alloy hollow guide vane
  • Method for forming inner cavity of high-temperature alloy hollow guide vane

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Embodiment 1

[0027] This embodiment is a case of preparing an equiaxed superalloy hollow guide vane by combining a water-soluble core and a ceramic core. The size of this blade is large: 305mm long, 260mm wide, and 185mm high. Using a single ceramic core to prepare castings is prone to cracks, eccentric cores, leaky cores, out of tolerance wall thickness and core-shell shrinkage differences resulting in inclusions and other defects. Measure the core channel of the inner cavity of the blade, the width is 43mm, the inner cavity structure of the intake side can be formed by the shell, and the inner cavity of the exhaust side is smaller in size and formed by the core. When designing the mold, the overall core is divided into two parts: the exhaust side and the intake side. The mold is designed. The core mold, the ceramic core and the water-soluble core are provided with a combined structure, and the ceramic core is provided with a fixed end positioning structure. When preparing the inner cav...

Embodiment 2

[0030] This embodiment is a case of preparing a single crystal superalloy hollow guide vane by combining a water-soluble core and a ceramic core. The size of this blade is large: the length is 180mm, the width is 115mm, and the height is 95mm. Using a single ceramic core to prepare a casting is prone to cracks, eccentric cores, leaky cores, out of tolerance wall thickness and core-shell shrinkage differences. and other defects. Measure the core channel of the inner cavity of the blade, the width is 32mm, the inner cavity structure of the intake side can be formed by the shell, and the inner cavity of the exhaust side is smaller in size and formed by the core. When designing the mold, the overall core is divided into two parts: the exhaust side and the intake side. The mold is designed. The core mold, the ceramic core and the water-soluble core are provided with a combined structure, and the ceramic core is provided with a fixed end positioning structure. When preparing the i...

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Abstract

The invention relates to the technical field of high-temperature alloy investment precision casting, in particular to a method for forming an inner cavity of a high-temperature alloy hollow guide vane. When the mold core mold is designed, the whole inner cavity mold core is divided into an exhaust edge and an air inlet edge, an inner cavity mold block on one side of the exhaust edge is made into a ceramic mold core mold, and a mold block on one side of the air inlet edge is made into a water-soluble mold core mold. When the inner cavity mold core is prepared, the ceramic mold core and the water-soluble mold core are pressed respectively, and after the two pressed mold cores are combined into a complete mold core, a blade wax mold is pressed; according to the principle that a water-soluble mold core is dissolved in water, the water-soluble mold core is removed, the remaining ceramic mold core is pressed into a wax mold, the side close to an air inlet edge serves as a fixed end, an exhaust edge serves as a free end, shell preparation is conducted, and the high-temperature alloy guide blade is prepared through the method that the ceramic mold core is fixed through an inner cavity shell. The casting stress generated by the shrinkage difference of the ceramic core and the molten metal can be reduced, and the crack and recrystallization tendency of the blade can be reduced.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy investment casting precision casting, in particular to a method for forming the inner cavity of a high-temperature alloy hollow guide vane. Background technique [0002] With the continuous improvement of gas turbine power and operating temperature, the demand for larger-sized superalloy hollow guide vanes (the size range of guide vanes is: length ≥ 100mm, width ≥ 60mm, height ≥ 35mm) is also increasing. In the actual production process of guide vanes, defects such as stress cracks, eccentric cores, leaky cores, uneven wall thickness, recrystallization and inclusions have always been the main problems that limit the qualified rate of vane production. SUMMARY OF THE INVENTION [0003] In order to solve the problems encountered in the production of the above-mentioned hollow guide vanes, the purpose of the present invention is to provide a method for forming the inner cavity of a su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02B22C9/10B22C9/24
CPCB22C9/103B22C9/24B22C9/106B22C7/02
Inventor 徐福涛孟杰周亦胄孙晓峰王亮王猛邹明科朱嘉韩阳么丽娜
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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