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Preparation method of complex large thin-walled Ni3Al alloy cast

A thin-walled casting, complex technology, applied in the direction of mold, core, mold composition, etc., can solve the problem of low pass rate, achieve the effect of quality improvement, reduction of metallurgical defects, and elimination of metallurgical defects

Active Publication Date: 2012-03-07
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For existing Ni 3 Al alloy complex large-scale thin-walled castings have the problem of low pass rate in the preparation, the invention provides a method for preparing Ni 3 The method of Al alloy complex and large thin-walled castings adopts the investment casting method. When preparing the mold shell, the ratio of the binder and the coating method are adjusted, and the corresponding pouring scheme is designed during pouring to improve the pouring Ni. 3 Product pass rate of Al alloy complex and large thin-walled castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepared Ni 3 The length of the bottom plate of Al alloy complex large thin-walled casting is 400mm, the width is 100mm, and the thickness is 0.8mm. The bottom plate is equipped with 3 longitudinal ribs perpendicular to the bottom plate and 13 transverse ribs perpendicular to the bottom plate. The longitudinal ribs and the transverse ribs Distributed in grid form, the length of longitudinal ribs is 100% of the length of the bottom plate, the length of transverse ribs is 100% of the width of the bottom plate, the height of transverse ribs and longitudinal ribs is 13~20mm, the thickness of transverse ribs and longitudinal ribs is the same as that of the bottom plate Same, at the same time, there are 8 bosses on the bottom plate, the height of the bosses is 30mm, the length is 20mm, and the thickness is 6mm;

[0027] Using the investment casting method, first prepare the wax mold of the complex large thin-walled casting with the gating system part and the part part;

[00...

Embodiment 2

[0042] Prepared Ni 3 The length of the base plate of Al alloy complex large thin-walled casting is 460mm, the width is 110mm, and the thickness is 1.0mm. The strips are distributed in a grid pattern, the length of the longitudinal ribs is 90% of the length of the bottom plate, and the width of the transverse ribs is 90% of the width of the bottom plate. The bottom plate is the same, and there are 10 bosses on the bottom plate. The height of the boss is 30mm, the length is 20mm, and the thickness is 10mm;

[0043] Using the investment casting method, first prepare the wax mold of the complex large thin-walled casting with the gating system part and the part part;

[0044] Mix the binder and powder to make a slurry, coat it on the surface of the wax model, then hang sand, and then dry it to make the shell surface layer, and then coat the slurry, hang sand, and dry the surface layer in sequence. Form the shell layers from the second layer to the ninth layer;

[0045] The binde...

Embodiment 3

[0058] Prepared Ni 3 The length of the bottom plate of Al alloy complex large thin-walled casting is 510mm, the width is 120mm, and the thickness is 1.2mm. Strips and transverse ribs are distributed in grid form, the length of longitudinal ribs is 80% of the length of the bottom plate, the length of transverse ribs is 60% of the width of the bottom plate, the height of transverse ribs and longitudinal ribs is 13~20mm, the length of transverse ribs and longitudinal The thickness of the ribs is the same as that of the bottom plate, and there are 12 bosses on the bottom plate. The height of the bosses is 30mm, the length is 30mm, and the thickness is 8mm;

[0059] Using the investment casting method, first prepare the wax mold of the complex large thin-walled casting with the gating system part and the part part;

[0060] Mix the binder and powder to make a slurry, coat it on the surface of the wax model, then hang sand, and then dry it to make the shell surface layer, and then ...

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Abstract

The invention provides a preparation method of a complex large thin-walled Ni3Al alloy cast, and belongs to the technical field of casting. The method comprises the following steps: (1) preparing a wax mould; (2) coating slurry, applying sand, drying to prepare a shell surface layer, preparing shell layers from the second layer to the ninth layer on the surface layer in sequence, and coating slurry; (3) drying to form a shell; (4) removing the wax mould, and preheating in a vacuum condition; (5) pouring Ni3Al alloy fluid in the shell, and controlling the pouring time to be between 5 and 7 seconds; and (6) cooling along with the furnace to the temperature of 650+ / -10 DEG C, naturally cooling in an insulating vessel, removing the shell on the surface, and cutting off the pouring gate part of the cast body. The cast prepared by adopting the method has remarkably reduced metallurgical defects, the problem of bar crack is successfully solved, and the quality is greatly improved.

Description

technical field [0001] The invention belongs to the field of casting technology, in particular to a method for preparing Ni 3 A method for complex large thin-walled castings of Al alloys. Background technique [0002] Ni 3 Al alloy has a series of advantages such as light specific gravity, high strength at high temperature, strong oxidation resistance and stable structure under high temperature conditions. It can better meet the special requirements of high temperature bearing and ablation resistance of the vector nozzle regulating plate, and it is widely used. However, due to the characteristics of the alloy in the pouring process, such as large mushy area and serious loosening tendency, when it is applied to the production of complex and large thin-walled castings with vector nozzles, there are difficulties in forming thin-walled castings, cracks, under-casting, looseness, etc. Defects, the casting process is very difficult; by using various existing processes to pour th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00
Inventor 高成薇韩宏王铁军倪伟贾石
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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