Fixing method of isometric crystal and columnar crystal ceramic mold core in mold shell

A ceramic core and fixing method technology, applied in the direction of core, casting mold, casting mold composition, etc., can solve the problems of ceramic core offset, affecting the pass rate, and casting scrap, so as to improve the pass rate and reduce casting leakage. Core or wall thickness out of tolerance, effect of reducing offset

Active Publication Date: 2013-01-16
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For investment casting with complex ceramic cores, the fixing of ceramic cores in the shell is usually positioned by inserting the core head of the ceramic core into the shell, but for complex structures and large distance between core heads During the pouring process, due to the high temperature creep of the ceramic core, the ceramic core is deformed, and there is insufficient positioning only by inserting the core head into the shell, which will easily lead to the deviation of the ceramic core , resulting in core leakage or wall thickness out of tolerance of the casting, which eventually makes the casting scrapped, seriously affecting its qualification rate

Method used

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  • Fixing method of isometric crystal and columnar crystal ceramic mold core in mold shell
  • Fixing method of isometric crystal and columnar crystal ceramic mold core in mold shell
  • Fixing method of isometric crystal and columnar crystal ceramic mold core in mold shell

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The blade is a ceramic core with a ceramic core rib length greater than 50mm and a width less than 10mm. figure 1 The "X" in the middle indicates the insertion point, and the serial numbers Ⅰ-Ⅶ indicate the number of insertion points. The high-temperature deformation of the ceramic core in the area of ​​the insertion point "I" toward the leaf basin exceeds 0.3 mm, and the high-temperature deformation of the ceramic core exceeds 0.3 mm. If it is less than 10mm, insert a platinum wire; the high-temperature deformation of the ceramic core in the insertion point "II" and "III" area toward the leaf basin exceeds 0.3mm, and the length of the ceramic core with a high-temperature deformation exceeding 0.3mm is about 25mm, Insert two platinum wires; the size and high-temperature deformation of the ceramic core corresponding to the insertion point "Ⅴ" are the same as those at the insertion point "I", and the high-temperature deformation of the ceramic core in the areas "VI" and "V...

Embodiment 2

[0028] The blade is a cantilevered ceramic core, and the position of the insertion point of the platinum wire is limited, figure 2 The "X" in the middle indicates the insertion point, the serial number A-D indicates the number of insertion points, the insertion points "A" and "B" in the direction of the leaf pot and the insertion points "C" and "D" in the direction of the back of the blade, and the section of the cantilever position of the ceramic core is taken as X-Y plane, see the cross-sectional view of the cantilever position of the ceramic core. At this time, the position and quantity of the insertion point of the platinum wire should be based on the best position and minimum quantity of the cantilever position of the ceramic core when the position of the cantilever is fully constrained in the X-Y plane, that is, from the ceramic core The cantilever position section view can determine the A-D insertion point position, a total of four insertion points.

Embodiment 3

[0030] The blade is a ceramic core with a length greater than 50mm and a width greater than 10mm. image 3 The "X" in the middle indicates the insertion point, and the serial number 1-16 indicates the number of insertion points. The high-temperature deformation of the entire ceramic core exceeds 0.3mm. Insert a platinum wire every 10-15mm on the edge, such as image 3 As shown, 4 platinum wires are respectively inserted along the leaf pot and the leaf back on the side of the core head, and a total of 16 platinum wires are inserted.

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Abstract

The invention relates to a precision casting production technology of a fired mold having a complex hollow blades, and particularly relates to a fixing method of an isometric crystal and columnar crystal ceramic mold core in a mold shell. The fixing method solves the fixing problem of the ceramic mold core in the mold shell when the complex inner cavity of the blades is formed by employing a preformed ceramic mold core technology, guarantees that the position of the ceramic mold core in the mold shell is relatively fixed during a metal liquid casting process, reduces or prevents the shift of the ceramic mold core, and for the ceramic mold core with relatively complex structure and relatively large core head space, effectively decreases the shift of the ceramic mold core caused by high-temperature creep of the ceramic mold core in a pouring process, thereby preventing the problems of core leakage or extremely poor wall thickness of the casting from generating. The method effectively improves the qualified rate of the investment casting of the complex hollow blades.

Description

technical field [0001] The invention relates to investment casting production technology with complex hollow blades, in particular to a method for fixing equiaxed crystal and columnar crystal ceramic cores in mold shells. Background technique [0002] With the development of modern aero-engines, the working performance of gas turbine engines is continuously improved. In order to achieve this goal, designers continue to improve the air-cooling structure of the blades to improve cooling efficiency, and form cooling channels inside the turbine blades. Turbine blades and cavity structures are also extremely complex. As we all know, extremely complex inner cavity structures all use ceramic cores to form channels, and these ceramic cores are extremely fragile and have limited thickness, and are easy to break. Due to the limitation of the size and position of the internal flow channel of the blade, the manufacturing and production of the blade are greatly affected. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10B22C9/04B22C9/24
Inventor 赵虹张凌峰常涛岐海潮刘晓飞刘文娜
Owner AECC AVIATION POWER CO LTD
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