Tapered embedded locating method for silicon-based ceramic core and aluminium-based ceramic shell

A technology of ceramic cores and aluminum-based ceramics, applied in the direction of cores, molds, mold components, etc., can solve the problems of blade size out-of-tolerance, inconsistency, blade deviation, etc., to solve positioning interference, additional The effect of low cost and reducing blade size out-of-tolerance

Inactive Publication Date: 2013-09-25
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its new method of specific silicon-based ceramic core and aluminum-based ceramic shell solves the problem of shrinkage of the two materials due to the long-term work of the silicon-based cerami

Method used

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  • Tapered embedded locating method for silicon-based ceramic core and aluminium-based ceramic shell
  • Tapered embedded locating method for silicon-based ceramic core and aluminium-based ceramic shell
  • Tapered embedded locating method for silicon-based ceramic core and aluminium-based ceramic shell

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] The tapered embedded positioning method of silicon-based ceramic core and aluminum-based ceramic shell is characterized by:

[0037] 1) Design a positioning groove at the positioning surface of the ceramic core. The positioning groove is specifically a tapered hole groove or a square tapered hole groove; one or two positioning grooves are selected to avoid over-positioning; when a positioning groove is selected, a square cone is selected When selecting two positioning grooves, the two positioning grooves are specifically tapered hole grooves;

[0038] 2) In the wax model design, the wax piece is provided with positioning holes corresponding to the position of the positioning groove in 1);

[0039] 3) Other auxiliary positioning select small plane positioning method; the weak area where the blade exhaust slot is located is set from the curved end; the thickness is controlled within 0.1mm ~ 0.5mm.

[0040] In the tapered embedded positioning method of the silico...

Example Embodiment

[0049] Example 2

[0050] The main content of this embodiment can be understood with reference to embodiment 1, and for details, see Appendix Figure 1-6 .

Example Embodiment

[0051] Example 3

[0052] The main content of this embodiment can be understood with reference to embodiment 1, and for details, see Appendix Figure 7-13 .

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Abstract

The invention relates to a tapered embedded locating method for a silicon-based ceramic core and an aluminium-based ceramic shell. The method comprises requirements as follows: 1) locating grooves are designed on locating surfaces of the ceramic core, wherein when one groove is used, a quadrate-tapered groove is selected, and when two locating grooves are used, the two locating grooves are tapered grooves; 2) a wax member, in a wax mould design, is provided with locating holes corresponding to the locating grooves; and 3) a small-planar locating mode is selected for other assistant locating; a weak area, where blade exhausting slots are located, is provided with a free end; and the thickness of the free end is 0.1 mm-0.5 mm. The locating method provided by the invention is advantageous in that the ceramic core is stably located in the ceramic shell; enough space is provided for expansion and contraction when the ceramic core is subjected to high temperature phase transitions; metallurgical defects, which are caused by locating problems of silicon-based ceramic cores and aluminium-based ceramic shells, such as out-of-tolerance blade sizes, slant blades, leak blades, broken cores, and the like are prevented; operation is simple and reliable; additional cost is very low; and the product qualified rate increases from 20% to 90%.

Description

technical field [0001] The invention relates to the technical field of single-crystal (orientation) hollow turbine blades without margin in the investment casting method, and in particular provides a conical embedded positioning method for a silicon-based ceramic core and an aluminum-based ceramic shell. Background technique [0002] The performance requirements of new aero-engines for their turbine blades are getting higher and higher. As a result, the design and structure of turbine blades, one of the most critical components of engine thermal breaks, are becoming more and more complex, and the requirements for manufacturing processes are getting higher and higher. Hollow cores with complex air-cooling structures , the characteristics of no margin, and the turbine blades using directional and single-crystal placement processes have become the mainstream in the design of new engines, and have been widely used in developed countries. In recent years, extensive and in-depth re...

Claims

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Application Information

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IPC IPC(8): B22C7/02B22C9/04
Inventor 王延辉林时波宁英丁山顾新
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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