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Wax mould manufacture method of aluminium alloy investment precision casting with embedded structure

A technology of mosaic structure and production method, which is applied in the field of wax mold production of aluminum alloy investment precision castings, can solve the problems of high mold cost, reduced yield of castings, and long production cycle, so as to improve the comprehensive yield and improve the dimensional accuracy , the effect of shortening the production cycle

Active Publication Date: 2020-06-23
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex inlay structure, the mold needs to be divided into many loose pieces. Not only the cost of the mold is extremely high, but the production cycle is long, and the positioning accuracy of the inlay structure is difficult to guarantee. It cannot be taken out at all, resulting in the failure to make the wax model successfully
[0004] On the other hand, for the mosaic structure made of stainless steel, during the production process of the investment casting mold shell, due to coating, dewaxing and shell roasting, the surface of the stainless steel material is easy to form oxidation slag, which leads to the casting process. Slag inclusion defects reduce the yield and even lead to the scrapping of castings, seriously affecting the delivery cycle of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Taking the aluminum alloy casting of the first-stage rectifier of a small aero-engine as an example, the mosaic structure is 35 stainless steel blades with a curved surface structure, and the casting matrix material is ZL105A. The specific steps for its implementation are as follows:

[0025] Step 1: Design a mold with 35 stainless steel blades wrapped in gypsum. The core of the blades is fixed in the mold block, and all the inlaid blades are exposed and leaked in the mold cavity;

[0026] Step 2: Pour gypsum into the mold designed in step 1, and take the mold after the gypsum hardens naturally; 35 stainless steel blades are wrapped in the gypsum;

[0027] Step 3: Use scrapers and other manual cleaning tools to smooth out defects such as parting batch seams and surface depressions on the gypsum-wrapped blade mosaic structure in step 2;

[0028] Step 4: Put the gypsum-wrapped leaf mosaic structure in step 3 in a tray filled with quartz sand, put it into a heating furnace...

Embodiment 2

[0032] Taking the aluminum alloy casting of the first-stage rectifier of a small aero-engine as an example, the mosaic structure is 21 stainless steel blades with a curved surface structure, and the casting matrix material is ZL101A. The specific steps for its implementation are as follows:

[0033] Step 1: Design a mold with 21 stainless steel blades wrapped in plaster. The core of the blades is fixed in the mold block, and all the inlaid blades are exposed and leaked in the mold cavity;

[0034] Step 2: Pour gypsum into the mold designed in step 1, and take the mold after the gypsum hardens naturally; 21 stainless steel blades are wrapped in the gypsum;

[0035] Step 3: Use scrapers and other manual cleaning tools to smooth out defects such as parting batch seams and surface depressions on the gypsum-wrapped blade mosaic structure in step 2;

[0036] Step 4: Put the gypsum-wrapped leaf mosaic structure in step 3 into a tray filled with quartz sand, put it into a heating furn...

Embodiment 3

[0040] Taking an aluminum alloy casting of an aviation fuel supply tank as an example, the mosaic structure is 6 special-shaped stainless steel tubes, and the casting matrix material is ZL104. The specific steps for its implementation are as follows:

[0041] Step 1: Design a mold for gypsum-wrapped 6 stainless steel pipes, the core of the steel pipes is fixed in the mold block, and the rest of the inlaid steel pipes are all exposed and leaked in the mold cavity;

[0042] Step 2: Pour gypsum into the mold designed in step 1, and take the mold after the gypsum hardens naturally; 6 special-shaped stainless steel tubes are wrapped in the gypsum;

[0043] Step 3: Use manual cleaning tools such as scrapers to smooth out defects such as parting batch seams and surface depressions on the steel pipe mosaic structure wrapped in plaster in step 2;

[0044] Step 4: Put the gypsum-wrapped steel pipe mosaic structure in step 3 into a tray filled with quartz sand, put it into a heating furn...

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PUM

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Abstract

The invention belongs to the technical field of investment precision casting manufacture, and relates to a wax mould manufacture method of an aluminium alloy investment precision casting with an embedded structure. The method includes the steps of: (1) manufacturing a mould wrapping the embedded structure; (2) filling the mould with gypsum until the embedded structure is wrapped completely by thegypsum; (3) taking out the mould after the gypsum is naturally hardened; (4) clearing a core mark position of the embedded structure to guarantee the core mark naked completely; (5) hardening the embedded structure wrapped with the gypsum at a low temperature; (6) putting the hardened embedded structure into a product wax mould; and (7) manufacturing the wax mould on a wax pressing machine. The embedded structure is wrapped with the gypsum, so the amount of oxidizing slag formed by a stainless steel embedded structure in the process of making a shell is lowered; the synthetical rate of finished products is improved; the problem of being incapable of producing the wax mould because of the complex embedded structure is solved; a plurality of embedded structures can be connected into an integral whole simultaneously so that the complex degree of the product wax mould structure is lowered greatly and the dimensional accuracy of the product wax mould is improved.

Description

technical field [0001] The invention belongs to the technical field of investment casting precision castings, and relates to a method for making a wax mold of an aluminum alloy investment casting precision casting with a mosaic structure. Background technique [0002] With the rapid development of my country's aerospace and other military industries, the requirements for weight reduction of castings are becoming more and more stringent, so aluminum alloy castings have been widely used. In order to better achieve the purpose of reducing the weight of the casting structure, the structural design of the casting is becoming more and more integrated and complicated, and the difficulty of the manufacturing process and the production cost of the casting are greatly increased. Therefore, on the premise of ensuring the performance of castings, in order to balance the relationship between production cost, qualified rate and production cycle, designers have designed many investment pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02
CPCB22C7/02
Inventor 周中波林琳黄旗何益可薛祥义
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD