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Integrated casting design method for controlling miscellaneous crystals of single crystal blade edge plate

A single crystal blade and design method technology, applied in the direction of casting molding equipment, mold, mold composition, etc., can solve the problem of limited control of miscellaneous crystal defects in single crystal blades

Inactive Publication Date: 2019-08-02
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the method of controlling the miscellaneous crystal defects in the edge plate during the directional solidification of single crystal blades is mainly by controlling the process parameters during the directional solidification process, including casting temperature and pulling rate. This method has limited control over the miscellaneous crystal defects of single crystal blades, and Mainly rely on experience, with a certain degree of blindness

Method used

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  • Integrated casting design method for controlling miscellaneous crystals of single crystal blade edge plate
  • Integrated casting design method for controlling miscellaneous crystals of single crystal blade edge plate
  • Integrated casting design method for controlling miscellaneous crystals of single crystal blade edge plate

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Embodiment 1

[0051] A method for controlling miscellaneous crystals on the edge plate of a single crystal blade through integrated casting mold design, comprising the following steps:

[0052] 1) Design the three-dimensional model of the casting system according to the blade structure, including castings, molds and simplified furnace wall and water cooling plate models

[0053] Firstly, use NX modeling software to design the spiral crystal selector. After the spiral crystal selector transitions smoothly with the top of the blade, the number and position of the modules are arranged according to the size of the water cooling plate. Good heat dissipation between the blades is required. Conditions, after completing the arrangement of the blades on the water cooling plate, design the pouring riser and flow channel, and then complete the design of the entire casting model. Design the casting mold model based on the casting model, and it is required to control the uniform wall thickness of 6-7mm;...

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Abstract

The invention discloses an integrated casting design and preparation method for controlling miscellaneous crystals of single crystal blade edge plate, and belongs to the technical field of material processing. The technical scheme includes: establishing a computer-experimental analysis model for numerical simulation, analyzing the temperature field distribution of the blade margin plate positionin the orientation process to obtain a local supercooling area of the margin plate position in the solidification process; additionally arranging a baffle plate structure at the blade body to delay the external heat radiation of the protruding position of the edge plate, so as to prevent local supercooling nucleation generated by faster heat radiation at the edge of the edge plate from generatingmiscellaneous crystals; and finally, adopting the mold core / mold shell integrated technology based on the 3D printing technology to perform rapid preparation of the mold, and obtaining the single crystal blade mold with the baffle plate structure for directional solidification pouring. The method is suitable for preparation of single crystal blades of different sizes of gas turbines, can effectively avoid miscellaneous crystal defects at the positions of the blade edge plates, and improves the casting qualification rate of the single crystal blades.

Description

technical field [0001] The invention belongs to the field of gas turbine single-crystal blade processing and manufacturing, and relates to an integrated casting mold design method for controlling single-crystal blade edge plate miscellaneous crystals. Background technique [0002] Nickel-based superalloys are widely used in the production of turbine blades in aero-engines and industrial gas turbines due to their excellent creep resistance and high-temperature oxidation resistance. Castings with columnar grains and single crystal structures can be produced by applying the directional solidification process. Since the single crystal superalloy blade completely eliminates the grain boundary and improves the high-temperature creep performance and fatigue performance of the blade, it becomes the first choice for manufacturing high-performance aeroengines. [0003] One of the major problems currently encountered in the directional solidification of single crystal turbine blades i...

Claims

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Application Information

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IPC IPC(8): G06F17/50B22C9/22
CPCB22C9/22G06F30/17G06F30/20
Inventor 鲁中良李涤尘连伟波苗恺刘哲峰
Owner XI AN JIAOTONG UNIV
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