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Aluminum alloy investment casting method and investment casting device adopting near liquidus pouring

An investment casting, near-liquidus technology, applied in casting molding equipment, molds, mold components, etc., can solve problems such as poor melt flow properties, and achieve elimination of casting stress, uniform structure, and fine grains. Effect

Inactive Publication Date: 2016-05-25
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the pouring temperature decreases, the flow properties of the melt deteriorate, and it is necessary to increase the mold shell preheating temperature to increase the filling performance of the process

Method used

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  • Aluminum alloy investment casting method and investment casting device adopting near liquidus pouring
  • Aluminum alloy investment casting method and investment casting device adopting near liquidus pouring
  • Aluminum alloy investment casting method and investment casting device adopting near liquidus pouring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An aluminum alloy investment casting method for pouring near the liquidus line, the specific steps are as follows:

[0029] 1. Inject the water-soluble polymer PAG into the tank from the coolant inlet, and the temperature is room temperature;

[0030] 2. Place the formwork on the lifting platform, turn on the electromagnetic induction heating device, and heat up to 550°C;

[0031] 3. After smelting the ZL201A alloy, transfer it to the ladle and let it stand at 680°C (the melting temperature range is 548-650°C), then pour;

[0032] 4. According to the difference in wall thickness and size of the casting, lower the lifting platform at a speed of 0.5mm / s and immerse it in the water-soluble polymer PAG until the liquid level of the cooling liquid is flush with the bottom of the riser;

[0033] 5. Quickly raise the lifting platform, take out the casting, and clean the mold shell.

[0034] refer to figure 2 , an aluminum alloy investment casting device poure...

Embodiment 2

[0036] An aluminum alloy investment casting method for pouring near the liquidus line, the specific steps are as follows:

[0037] 1. Pour water into the tank from the coolant inlet, and the temperature is room temperature;

[0038] 2. Place the formwork on the lifting platform, turn on the electromagnetic induction heating device, and heat up to 600°C;

[0039] 3. After melting the ZL116 alloy, transfer it to the ladle and let it stand at 630°C (the melting temperature range is 557-596°C), then pour;

[0040] 4. According to the difference in wall thickness and size of the casting, lower the lifting platform at a speed of 1mm / s and immerse it in water until the liquid level of the cooling liquid is flush with the bottom of the riser;

[0041] 5. Quickly raise the lifting platform, take out the casting, and clean the mold shell.

[0042] The aluminum alloy investment casting device is the same as in Example 1.

Embodiment 3

[0044] An aluminum alloy investment casting method for pouring near the liquidus line, the specific steps are as follows:

[0045] 1. Fill the quenching oil into the tank from the coolant inlet, and the temperature is room temperature;

[0046] 2. Place the formwork on the lifting platform, turn on the electromagnetic induction heating device, and heat up to 600°C;

[0047] 3. After smelting the ZL303 alloy, transfer it to the ladle and let it stand at 680°C (the melting temperature range is 550-650°C), then pour;

[0048] 4. According to the difference in wall thickness and size of the casting, lower the lifting platform at a speed of 5mm / s and immerse it in the quenching oil until the liquid level of the cooling liquid is flush with the bottom of the riser;

[0049] 5. Quickly raise the lifting platform, take out the casting, and clean the mold shell.

[0050] The aluminum alloy investment casting device is the same as in Example 1.

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Abstract

The invention discloses an aluminum alloy investment casting method adopting near liquidus pouring. The method comprises the following steps: preheating a mould shell to be close to the liquidus, performing near liquidus temperature pouring, and meanwhile, reducing the pouring temperature, and pouring after the melt temperature is higher than the temperature of the liquidus; after finishing pouring, immersing the mould shell into the cooling liquid at a certain speed, thereby effectively and accurately controlling a solidification process of the casting; quickening the cooling of the casting, thereby acquiring the high-quality aluminum alloy casting with uniform structure and small grain. In the casting solidification process, the temperature gradient can be accurately controlled, the lower part of the casting is firstly soaked into the cooling liquid and the upper part is still in the heating atmosphere and under the molten state, so that the casting can be solidified from bottom to top, the solidified part is subjected to full liquid feeding, the casting is compact in structure, and meanwhile, the casting stress in the solidification process of each part of the casting is eliminated. The method provided by the invention is fit for common aluminum alloy casting and large-size, thin-wall and complex aluminum alloy investment casting.

Description

technical field [0001] The invention relates to the field of metal solidification manufacturing, in particular to an aluminum alloy investment casting method and an investment casting device for pouring near the liquidus line. Background technique [0002] Investment casting can produce castings with complex shapes, high dimensional accuracy and surface finish, and has been widely used in the casting field. Among them, aluminum alloy investment casting is most commonly used in aviation, aerospace and civil fields. In investment casting, the preheating of the mold shell helps to improve the fluidity, but the cooling rate of the casting is limited due to the low heat transfer coefficient of the mold shell. Therefore, compared with common casting methods, such as metal casting, sand casting, etc., the lower cooling rate of investment casting is not conducive to obtaining fine grains. Therefore, although the dimensional accuracy of ordinary investment castings is high, the gra...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22D27/04
CPCB22C9/04B22D27/04
Inventor 张守银徐志锋余欢
Owner NANCHANG HANGKONG UNIVERSITY
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