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Preparation method for hollow mold core having high temperature deformability and removability

A hollow type, concessional technology, applied in the direction of core, casting molding equipment, casting mold, etc., can solve the problems of high scrap rate and cracks of castings, and achieve the effect of improving the qualification rate of castings and reducing production costs.

Active Publication Date: 2013-01-30
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The casting of the turbine guide blade of an engine is a hollow equiaxed crystal casting blade, and crack failures often occur during production, resulting in a high scrap rate of the casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Pressing of the hollow core blank: Press the hollow core blank with a mold, so that the ratio of the wall thickness of the hollow core blank to the short axis dimension of the cross section is 1:10, and the wall thickness of the hollow core blank is 1.5mm , pressed into a hollow core blank with a larger outlet at one end and a smaller outlet at the other end;

[0018] (2) Sintering of the hollow core blank: Put a pressed hollow core blank with the big mouth facing upwards, insert it vertically into the sintering tank filled with two-fifths of the filler, then slowly fill in the remaining filler, and sinter After the tank is full, shake the filler and put it into the sintering furnace for firing. The temperature rise of the hollow core billet in the sintering furnace is divided into five stages: 200°C, 400°C, 600°C, 900°C and final firing. The final firing temperature is 1000°C, the holding time at each stage is 1 hour;

[0019] (3) Filling of the hollow core cavity...

Embodiment 2

[0022] (1) Pressing of the hollow core blank: use a mold to press the hollow core blank, so that the ratio of the wall thickness of the hollow core blank to the short axis dimension of the cross section is 1.5:10, and the wall thickness of the hollow core blank is 6mm. Pressed into a hollow core blank with a larger outlet at one end and a smaller outlet at the other end;

[0023] (2) Sintering of hollow core blanks: Put the three pressed hollow core blanks with their big mouths facing up, and insert them vertically into the sintering tank filled with two-fifths of the filler. The distance between the hollow cores is 16mm, then slowly fill in the remaining filler, fill the sintering pot and shake the filler, put it into the sintering furnace for firing, the temperature rise of the hollow core blank in the sintering furnace is divided into 200°C, 400°C, 600°C, 900°C There are five stages of final firing, the final firing temperature is 1160°C, and the holding time in each stage ...

Embodiment 3

[0027] (1) Pressing of the hollow core blank: use a mold to press the hollow core blank, so that the ratio of the wall thickness of the hollow core blank to the short axis dimension of the cross section is 1.3:10, and the wall thickness of the hollow core blank is 10mm. Pressed into a hollow core blank with a larger outlet at one end and a smaller outlet at the other end;

[0028] (2) Sintering of hollow core blanks: Put five pressed hollow core blanks with their big mouths facing up, and insert them vertically into a sintering tank filled with two-fifths of the filler. The distance between the hollow cores is 17mm, then slowly fill in the remaining filler, fill the sintering pot and shake the filler, put it into the sintering furnace for firing, the temperature rise of the hollow core blank in the sintering furnace is divided into 200°C, 400°C, 600°C, 900°C There are five stages of final firing, the final firing temperature is 1100°C, and the holding time in each stage is 3 h...

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Abstract

The present invention relates to the technical field of mold core preparation, specifically to a preparation method for a hollow mold core having high temperature deformability and removability. According to the preparation method, a hollow mold core blank is pressed, wherein a mold is adopted to press a hollow mold core blank with a large outlet on one end and a small outlet on the other end; the hollow mold core blank is sintered, wherein the large outlet end surface of the pressed-molded hollow mold core blank is upwardly, a final firing temperature is 1000-1160 DEG C, and a thermal insulation time is 1-6 hours at every stage; a cavity of the hollow mold core is filled; and finally the hollow mold core is strengthened to obtain the final product. With the method, the problem of hollow casting cracks or difficult core removing is effectively solved, shrinkage depression easily generated during thick large mold core pressing and other defects are avoided, mold core production qualification rate is improved, production materials are saved, the method can be widely used in aerospace or civilian product production, casting qualification rate is significant improved, and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of core preparation, in particular to a method for preparing a hollow core with high temperature yield and detachability. Background technique [0002] The casting of a turbine guide blade of an engine is a hollow equiaxed crystal casting blade, and crack failures often occur during production, resulting in a high rejection rate of the casting. After research, it was found that the crack fault was directly related to the yield of the ceramic core used in casting blades. After more than a year of research, a mold with excellent yield and meeting the strength requirements for pressing wax molds and castings was found. The core preparation process is produced, and at the same time, the removal of this type of core in the casting is also very easy, which can also reduce the material used for the core, prevent the core from shrinkage and other defects during production, and improve the qualified rate of core prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10
Inventor 李波陈仲强王少刚刘艳祝世哲
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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