Manufacturing method of ceramic mold of monocrystal turbine blade

A technology of turbine blades and ceramic casting molds, which is applied to ceramic molding machines, casting molds, and casting mold components. It can solve the problems of difficult control of grain shape and low assembly precision of spiral crystal selectors, and achieve the goal of improving heat transfer capacity. Effect

Active Publication Date: 2013-12-25
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a method for manufacturing single crystal turbine blade ceramic molds, which solves the problems of low assembly precision of the spiral crystal...

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  • Manufacturing method of ceramic mold of monocrystal turbine blade
  • Manufacturing method of ceramic mold of monocrystal turbine blade
  • Manufacturing method of ceramic mold of monocrystal turbine blade

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Embodiment Construction

[0057] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0058] A method for manufacturing a single crystal turbine blade ceramic mold, comprising the following steps:

[0059] 1) According to the requirements of the grain orientation of the single crystal turbine blade, combined with the calculation and experiment of casting finite element software, design the spiral crystal selector, including the number of turns of the spiral crystal selection section, the distance between adjacent spiral sections and the size of the crystal lifter ;

[0060] 2) Design the initial casting mold based on the single crystal hollow turbine blade with a spiral crystal selector, and import it into the casting finite element software for heat transfer and stress analysis; The shape of the outer wall of the mold shell is used to reduce the stress; according to the dist...

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Abstract

The invention discloses a manufacturing method of a ceramic mold of a monocrystal turbine blade. The integral ceramic mold with a special spiral crystal selector is designed and manufactured according to grain orientation requirements of the monocrystal turbine blade. When orientated solidification is used for manufacturing the monocrystal blade, the thickness of a shell at an abrupt change in a section (such as a connecting part between a blade body and a marginal plate) is increased, and the heat transfer capacity is reduced, so that crystal defects such as stray crystals are caused easily. On the premise that the casting strength requirements are met, with the adoption of topological optimization and design of a heat transfer passage, the heat transfer capacity of the mold is improved, and a temperature gradient on the leading edge of a solid-liquid interface during the orientated solidification is increased, so that the whole blade can obtain a good monocrystal organization.

Description

technical field [0001] The invention belongs to the field of rapid casting, and relates to a method for manufacturing a single-crystal turbine blade ceramic mold. Background technique [0002] The single crystal blade is a blade developed based on directional solidification technology that completely eliminates the grain boundary texture along the direction of the blade body. It has excellent high temperature creep resistance, thermal mechanical fatigue resistance, oxidation corrosion resistance and high temperature bearing capacity. In order to obtain high-quality metal single crystals, a single crystal nucleus must first be formed in the metal melt. At present, in the manufacture of single crystal turbine blades, spiral crystal selectors are mainly used to obtain single crystal nuclei. The spiral crystal selector is a cavity set at the lower part of the casting body, which is composed of a crystal raising segment and a spiral crystal selecting segment. In the past, when...

Claims

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Application Information

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IPC IPC(8): B22C9/22C30B11/00B28B1/08B28B1/14C04B35/622
Inventor 李涤尘鲁中良苗恺
Owner XI AN JIAOTONG UNIV
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