Positioning layout optimization method for ceramic core in precision casting hollow turbine blade shell

A technology for optimizing the layout of turbine blades, which is applied in the field of optimizing the positioning and layout of ceramic cores inside the shell of precision-cast hollow turbine blades. Effect

Pending Publication Date: 2022-03-22
SHANXI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of out-of-tolerance wall thickness and size of precision-cast hollow turbine blades, the present invention provides a method for optimizing the positioning and layout of ceramic cores inside the shell of precision-cast hollow turbine blades

Method used

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  • Positioning layout optimization method for ceramic core in precision casting hollow turbine blade shell
  • Positioning layout optimization method for ceramic core in precision casting hollow turbine blade shell
  • Positioning layout optimization method for ceramic core in precision casting hollow turbine blade shell

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Experimental program
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Effect test

Embodiment 1

[0042] Step 1. Based on the fluid simulation computing platform, calculate the node pressure value formed by the metal casting liquid on the surface of the ceramic core during the blade casting process. The specific method is:

[0043] The blade and ceramic core are modeled in the three-dimensional drawing software UG, and the geometric model assembly relationship between the blade and the ceramic core is as follows: image 3 As shown; then the finite element meshing is carried out in HyperMesh, in which, the number of blade (cavity) grid nodes is 54811, and the number of elements is 289238; after that, the finite element model of the blade and ceramic core is imported The fluid simulation calculation platform ANSYS, selects the multiphase flow and turbulence calculation model, sets the casting speed to 0.45m / s, uses the top injection casting method to simulate the blade casting process, and obtains the pressure of the central node of each grid on the surface of the ceramic cor...

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Abstract

The invention discloses a precision casting hollow turbine blade shell internal ceramic core positioning layout optimization method, and belongs to the technical field of aero-engine hollow turbine blade precision casting. In order to solve the problem that the wall thickness of the hollow turbine blade of the aero-engine is out of tolerance due to the position drift of a ceramic core in the casting process at present, the stamping load of a metal casting liquid flow field on the molded surface of the ceramic core and the drift condition of the ceramic core in the precision casting process are analyzed from the process of clamping the ceramic core in a blade shell; and on the basis, a shell internal ceramic core auxiliary positioning platinum wire positioning layout optimization method is constructed, and finally the aim of accurately controlling the wall thickness precision of the hollow turbine blade is achieved by limiting drifting of the ceramic core in the casting process. The method specifically comprises the following steps: calculating a pressure intensity value applied to ceramic core surface nodes by metal casting liquid, and stamping a load on a ceramic core molded surface; and a ceramic core surface positioning scheme set is constructed, and a platinum wire positioning scheme with the minimum ceramic core drift amount in the precision casting process is searched in the ceramic core surface positioning scheme set through a heuristic algorithm.

Description

technical field [0001] The invention belongs to the technical field of precision casting of hollow turbine blades of aero-engines, and in particular relates to a method for optimizing the positioning and layout of ceramic cores inside the housing of precision-cast hollow turbine blades. Background technique [0002] Hollow turbine blade wall thickness accuracy is a key technical index to ensure blade strength and service life. According to the precision casting process of the blade, the wall thickness accuracy of the hollow turbine blade is mainly determined by the position of the ceramic core in the inner space of the shell. Therefore, in order to prevent the position of the ceramic core from drifting during the casting process, a positioning mechanism for the ceramic core is generally designed inside the mold shell. [0003] The ceramic core is usually limited and fixed by the fixed end positioning mechanism and the platinum wire auxiliary positioning element inside the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06N3/12G06F111/06G06F113/08G06F119/14
CPCG06F30/17G06F30/23G06N3/126G06F2111/06G06F2113/08G06F2119/14
Inventor 崔康荆琳于龙女高萧
Owner SHANXI UNIV
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