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Manufacturing method of composite shell of large diffuser precision casting

A manufacturing method and composite technology, applied in the field of precision casting, can solve the problems of long pouring time of molten metal, not easy to shell out, heavy casting weight, etc. Effect

Active Publication Date: 2015-09-23
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shell made by this shell making method has two disadvantages: first, because the shell is thicker, the shell collapse is not good, and the casting is not easy to shell after pouring; second, because the casting is heavy Heavy, the structure of the casting is relatively complex, the pouring time of the molten metal is long, and the flow time in the shell is relatively long. At the part where the molten metal flows last, the casting cannot be effectively filled due to the temperature drop of the molten metal, which is prone to undercasting and Loose defects, resulting in out-of-tolerance or even scrapping, low pass rate of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]1. Coating the surface coating: the surface coating adhesive is silica sol, the refractory material is 325 mesh zircon powder, the surface refiner is cobalt aluminate, the defoamer is n-octanol, and the wetting agent is penetrating agent "T"; the ratio of the surface layer slurry is: for every 1 liter of silica sol, add 5 ml of wetting agent, add 10 ml of defoamer, add 3.68Kg of zircon powder, and add 0.32Kg of cobalt aluminate; after preparation The specific gravity of the surface layer slurry is 2.65g / cm 3 ; The particle size of the surface layer is 70 mesh corundum sand. Naturally dry the wax mold assembly coated with the surface coating for 12 hours;

[0021] 2. Coating the transition layer coating: the number of layers of the transition layer coating is 2 layers; the binder of the transition layer coating is ethyl silicate hydrolyzate, the silicon dioxide content of ethyl silicate hydrolyzate is 20%, and the refractory material is the above Store powder, the parti...

Embodiment 2

[0026] 1. Coating the surface coating: the surface coating adhesive is silica sol, the refractory material is 325 mesh zircon powder, the surface refiner is cobalt aluminate, the defoamer is n-octanol, and the wetting agent is penetrating agent "T"; the ratio of the surface layer slurry is: for every 1 liter of silica sol, add 5 ml of wetting agent, add 10 ml of defoamer, add 3.68Kg of zircon powder, and add 0.32Kg of cobalt aluminate; after preparation Slurry specific gravity is 2.80g / cm 3 ; The particle size of the surface layer is 70 mesh corundum sand. Naturally dry the wax mold assembly coated with the top coat for at least 16 hours;

[0027] 2. Coating the transition layer coating: the number of layers of the transition layer coating is 3 layers; the binder of the transition layer coating is ethyl silicate hydrolyzate, the silicon dioxide content of ethyl silicate hydrolyzate is 20%, and the refractory material is the above Store powder, the particle size of Shangdian ...

Embodiment 3

[0032] 1. Coating the surface coating: the surface coating adhesive is silica sol, the refractory material is 325 mesh zircon powder, the surface refiner is cobalt aluminate, the defoamer is n-octanol, and the wetting agent is penetrating agent "T"; the ratio of the surface layer slurry is: for every 1 liter of silica sol, add 5 ml of wetting agent, add 10 ml of defoamer, add 3.68Kg of zircon powder, and add 0.32Kg of cobalt aluminate; after preparation The specific gravity of the surface layer slurry is 2.95g / cm 3 ; The particle size of the surface layer is 70 mesh corundum sand. Naturally dry the wax mold assembly coated with the top coat for 24 hours;

[0033] 2. Coating the transition layer coating: the number of layers of the transition layer coating is 5 layers; the binder of the transition layer coating is ethyl silicate hydrolyzate, the silicon dioxide content of ethyl silicate hydrolyzate is 20%, and the refractory material is Store powder, the particle size of Shan...

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Abstract

The invention belongs to a precision casting technology, and relates to a manufacturing method of a composite shell of a large diffuser precision casting. The manufacturing method of the composite shell of the large diffuser precision casting is characterized by comprising the following steps of smearing investment precoat; smearing a transition layer coating; smearing a heat-insulation layer coating; smearing a reinforcement layer coating; and smearing a seal layer coating. By the manufacturing method of the composite shell of the large diffuser precision casting, collapsibility of the shell is improved, and the difficulty of unshelling is reduced; and the heat-insulation performance of the shell is improved, shortcomings of undercasting and loosening of the casting are avoided, and the yield of the casting is improved.

Description

technical field [0001] The invention belongs to the precision casting technology, and relates to a method for manufacturing a large-scale diffuser precision casting composite shell. Background technique [0002] The precision casting of a large-scale non-residual diffuser is one of the key hot-end parts of an aero-engine. It is generally composed of different numbers of blades connected by inner and outer rings. It is generally formed by one-time integral casting. The maximum diameter is usually above φ500mm. Due to the great disparity in wall thickness and many hot joints, castings are prone to undercasting and loose metallurgical defects. The shell making technology is one of the key technologies for precision castings of this type of large diffuser. The surface layer of the existing shell-making method adopts silica sol adhesive coating, and the back layer adopts ethyl silicate hydrolyzate adhesive coating. The weight of such castings is generally heavy. In order to ensur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C3/00
Inventor 朱珍珠刘晓飞海潮常涛岐张云鹏王琳陈波武晓刚
Owner AECC AVIATION POWER CO LTD
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