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Smelting and pouring method of titanium alloy casting with thin-wall and complex structure

A technology with complex structure and pouring method, applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems that affect the development and application of titanium alloy castings, no molding, etc.

Active Publication Date: 2020-05-22
西安超晶科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The investment casting + shell furnace pouring production method of titanium alloy castings has basically taken shape. Most of the mold shell slurry for castings is made of yttria and zirconium acetate. Casting process, no molding process parameters can be used as a reference
Due to the emergence of this problem, the development and application of titanium alloy castings have been seriously affected, so it is necessary to design a suitable solution to these problems at this stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Taking a bracket casting as an example, the casting size is 450×300×100mm, the material is ZTA15, and the wall thickness varies greatly. The thin and thick wall sizes are 7mm and 26mm respectively, and the ratio is close to 1:4. The specific steps of the melting and pouring method as follows:

[0031] Step 1: Press the casting wax pattern, the surface roughness of the wax pattern must be higher than Ra3.2;

[0032] Step 2: According to the pouring system design, complete the wax mold assembly;

[0033] Step 3: preparing casting formwork;

[0034] Step 4: mold shell dewaxing;

[0035] Step 5: Prepare a diameter of The material ingot, the height is 420mm, and the electrode welding is completed;

[0036] Step 6: Fix the mold shell to the centrifugal plate of the shell solidification furnace, and the mold shell enters the furnace at a mold temperature of 400°C;

[0037] Step 7: Melting and pouring. After the crucible is preheated to dark red, put in the metal ingot. T...

Embodiment 2

[0046] Taking a diversion basin casting as an example, the material is ZTC4, and the outline size The overall wall thickness is 6mm, the casting is basin-shaped, with a large arc, and the inner cavity is hollow. The specific steps of the melting and pouring method are as follows:

[0047] Step 1: Press the casting wax pattern, the surface roughness of the wax pattern must be higher than Ra3.2;

[0048] Step 2: According to the pouring system design, complete the wax mold assembly;

[0049] Step 3: preparing casting formwork;

[0050] Step 4: mold shell dewaxing;

[0051] Step 5: Prepare a diameter of The material ingot, the height is 380mm, and the electrode welding is completed;

[0052] Step 6: Fix the mold shell to the centrifugal plate of the shell solidification furnace, and the mold shell enters the furnace at a mold temperature of 400°C;

[0053]Step 7: Smelting and pouring. After the crucible is preheated to dark red, load the metal ingot. The vacuum degree in t...

Embodiment 3

[0061] Taking a shell as an example, the casting material is ZTC4, the outline size is 295×180×240mm, the casting is hemispherical and closed, the wall thickness of the whole body is 4mm, and it is hollow. The specific steps of the melting and pouring method are as follows:

[0062] Step 1: Press the casting wax pattern, the surface roughness of the wax pattern must be higher than Ra3.2;

[0063] Step 2: According to the pouring system design, complete the wax mold assembly;

[0064] Step 3: preparing casting formwork;

[0065] Step 4: mold shell dewaxing;

[0066] Step 5: Prepare a diameter of The material ingot, the height is 490mm, and the electrode welding is completed;

[0067] Step 6: Fix the mold shell to the centrifugal plate of the shell solidification furnace, and the mold shell enters the furnace at a mold temperature of 500°C;

[0068] Step 7: Melting and pouring. After the crucible is preheated to dark red, put in the metal ingot. The vacuum degree in the mel...

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PUM

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Abstract

The invention belongs to the technical field of titanium alloy casting production, and relates to a smelting and pouring method of a titanium alloy casting with a thin-wall and complex structure. Themethod comprises the following steps of pressing a casting wax mold; manufacturing a pouring system and finishing wax mold assembling; preparing a casting mold shell; dewaxing the mold shell; preparing a material ingot with the diameter of phi 220-phi 260 mm, and finishing electrode welding; roasting the mold shell, specifically, fixing the mold shell to a centrifugal disc of a skull furnace, wherein the in-furnace type temperature of the mold shell is 400-600 DEG C; performing stage division according to arc starting, complete melting, smelting and pouring, and formulating a smelting and pouring process; taking out a casting after pouring is completed; shell clearing and polishing of the casting; performing nondestructive testing on the casting metallurgical quality; and evaluating the casting surface quality. Through the improvement of the smelting and pouring process, a low current is adopted for arc starting and arc stabilizing, and smelting is completed with a high current, and molten metal is poured with a large superheat degree, the finally produced casting can meet the requirements of GJB 2896 A II kind parts, and the surface quality of the casting is between Ra 3.2 and Ra6.3.

Description

technical field [0001] The invention belongs to the technical field of production of titanium alloy castings, and relates to a melting and pouring method for thin-walled complex structure titanium alloy castings. Background technique [0002] Due to its high specific strength, good corrosion resistance and good high and low temperature performance, titanium alloys have been widely used in my country's aerospace, chemical, naval and other fields. Since the 1950s, titanium alloys have developed rapidly especially in the field of aerospace. As one of the main structural materials of contemporary aircraft and engines, titanium alloys can not only reduce the weight of aircraft, but also play a significant role in the optimization of aircraft structure. substantive meaning. However, the domestic application of titanium alloys is mainly concentrated in the field of forgings, and titanium alloy forgings generally need to be machined to achieve the final near-net shape, and its prod...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/22B22C13/00C22B9/20
CPCB22C9/04B22C9/22B22C13/00C22B9/20
Inventor 周中波何益可陈西孟林琳王笑
Owner 西安超晶科技股份有限公司