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A precision casting method for the skeleton of a superalloy hollow complex thin-walled structural part

A technology of thin-walled structural parts and high-temperature alloys, which is applied in the directions of casting molds, casting mold components, casting molding equipment, etc., can solve the problems of complexity, easy generation of looseness, and difficult casting process, so as to improve the qualification rate and improve production efficiency. Effect

Active Publication Date: 2016-09-07
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This piece is a complex, hollow, thin-walled special-shaped structural part, which is prone to defects such as looseness during the casting process, and the casting process is extremely difficult

Method used

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  • A precision casting method for the skeleton of a superalloy hollow complex thin-walled structural part
  • A precision casting method for the skeleton of a superalloy hollow complex thin-walled structural part
  • A precision casting method for the skeleton of a superalloy hollow complex thin-walled structural part

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Castings such as figure 1 It is shown that there are many heat joints, and the casting process is more difficult, such as figure 2 As shown, metallurgical defects such as loose skeleton castings are prone to occur in the square frame area. Since castings are not allowed to be repaired and welded, they will be scrapped if the defect diameter exceeds the standard after pouring; the inner cavity of the casting is a complex hollow structure, and there are 6 cores when pressing the wax mold. Combined to form together, such as image 3 As shown, carry out the research on the investment casting process of skeleton castings, and determine the appropriate gating system combination scheme, such as Figure 4 Shown and pouring process as Figure 5 As shown, high-quality skeleton precision castings have been developed.

[0027] The present invention relates to a precision casting method for the skeleton of a complex thin-walled structure of a superalloy cavity, which is carried ...

Embodiment 2

[0041] Embodiment 2 is basically the same as the method of embodiment 1, parts such as Figure 6 As shown, adjust the size of the gating system according to the size of the part, the difference is:

[0042] (1) Wax mold manufacturing: Wax mold manufacturing is carried out according to the shape of the casting; when the wax mold is pressed, it is formed by combining three cores, and each wax piece needs to prepare a polyethylene glycol (urea core) soluble type Core and 2 ceramic cores; the process parameters of the high-pressure wax press machine mold are: holding time 150s, injection pressure 1.4MPa, wax temperature 68°C;

[0043] (3) Vacuum melting of castings

[0044] Packing process: the preheating temperature of the shell in the high-temperature furnace is 980°C±10°C, and the holding time is 3h;

[0045] Pouring process: The master alloy material used for the skeleton casting is K424 alloy, and the pouring equipment adopts a 50kg vacuum furnace; in order to control defec...

Embodiment 3

[0047] Embodiment 3 is basically the same as the method of embodiment 1, parts such as Figure 7 As shown, adjust the size of the gating system according to the size of the part, the difference is:

[0048] (1) Wax mold manufacturing: Wax mold manufacturing is carried out according to the shape of the casting; when the wax mold is pressed, it is formed by combining three cores, and each wax piece needs to prepare a polyethylene glycol (urea core) soluble type core and 2 ceramic cores;

[0049] The process parameters of the high-pressure wax machine mold: the holding time is 120s, the injection pressure is 1.5MPa, and the wax temperature is 66°C;

[0050] (3) Vacuum melting of castings

[0051] Packing process: the preheating temperature of the shell in the high temperature furnace is 1100℃±10℃, and the holding time is 4h;

[0052] Pouring process: The master alloy material used for the skeleton casting is K424 alloy, and the pouring equipment adopts a 50kg vacuum furnace; i...

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Abstract

The invention provides a precision casting method for a complex thin-wall structural member framework of a high-temperature alloy cavity, and belongs to the technical field of precision casting of a structural member of a complex cavity of an aeronautic engine. The method is performed according to the following steps: (1) manufacturing a wax mould; (2) executing a combined scheme of a wax mould casting system, wherein the combined scheme of the casting system adopts a side casting type, and two members of each group are in symmetric distribution; (3) vacuum melting and casting casts, wherein vacuum melting and casting the casts comprise a container packing technology and a casting technology, a container packing manner of preheating a heat preservation felt is adopted, and reasonable refining temperature, refining time, casting temperature and casting speed are determined. According to the invention, the container packing manner of preheating the heat preservation felt is adopted for a shell, and the preheating temperature scope of the shell is determined. According to the cavity filling and solidifying regularity of an alloy, appropriate melting and casting equipment is selected, the vacuum melting and casting technology is formulated, the reasonable refining temperature, the reasonable refining time, the casting temperature and the reasonable casting speed are determined, the shaping rate of the casts achieves 100%, the problems that the casts are loose and the like are effectively solved, and the qualified rate of the casts is obviously increased.

Description

technical field [0001] The invention belongs to the technical field of precision casting of complex cavity structural parts of aero-engines, and in particular relates to a precision casting method for skeletons of complex cavity thin-walled structural parts of high-temperature alloys. Background technique [0002] The skeleton is an important part of an aero-engine. The outer dimension of the skeleton casting is about 300mm long, the minimum wall thickness is 3mm, the thickness of the casting varies greatly, there are many hot spots, and the inner cavity structure is complex, which needs to be formed by multiple soluble cores and ceramic cores. This piece is a complex, hollow, thin-walled special-shaped structural piece, which is prone to defects such as looseness during the casting process, and the casting process is extremely difficult. The combination scheme design of the gating system and the optimization of the parameters of the casting process play a positive role in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
CPCB22C9/046
Inventor 高成薇韩宏顾欣倪伟刘乃坚
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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