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Differential pressure anti-gravity mold-filling solidification device under action of external field and process method thereof

A gravity and process technology, applied in the field of low pressure casting, can solve the problems of inability to completely stir and remove impurities and gases, and achieve the effects of low porosity of castings, enhanced nucleation and dissociation, and uniform distribution of solutes.

Pending Publication Date: 2021-04-02
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the above, the existing low-pressure casting technology has the technical problems that impurities and gases cannot be completely removed and cannot be completely stirred, and a differential pressure anti-gravity mold filling and solidification device and process method under the action of an external field are provided

Method used

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  • Differential pressure anti-gravity mold-filling solidification device under action of external field and process method thereof
  • Differential pressure anti-gravity mold-filling solidification device under action of external field and process method thereof
  • Differential pressure anti-gravity mold-filling solidification device under action of external field and process method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Put ZL114A aluminum alloy raw materials or pure aluminum and intermediate alloys such as Al-Si and Al-Mg into the melting crucible 7 after drying and removing surface impurities, and start the induction melting device 9 to melt the raw materials at 700-710°C liquid, and then use the hydraulic lifting platform 10 to lift the crucible to such as figure 2 In the position shown, the modification agent is used for modification, and the high-purity argon with a purity greater than 99.99% is used for degassing and then slag removal;

[0049] 2. After removing slag, use the hydraulic lifting platform 10 to lower the melting crucible 7 to the induction heating device, such as image 3 As shown, the middle plate 4 is closed, and after the infusion tube 5, the casting mold 2 and the upper cavity 1 are installed, the upper cavity 1 and the lower cavity 12 are separated by the vacuum tank 16 Simultaneously vacuumize 10-20Pa;

[0050] 3. Start the induction heating device to ra...

Embodiment 2

[0056] 1. Put ZL205A aluminum alloy raw materials or intermediate alloys such as pure aluminum and Al-Cu into the melting crucible 7 after drying and removing surface impurities, start the induction melting device 9 to melt the raw materials into a liquid at 700-715°C, and then use The hydraulic lifting platform 10 lifts the melting crucible 7 to such as figure 2 In the position shown, the modification agent is used for modification, and the high-purity argon with a purity greater than 99.99% is used for degassing and then slag removal;

[0057] 2. After removing slag, use the hydraulic lifting platform 10 to lower the melting crucible 7 to the induction melting device 9, close the middle plate 4, install the infusion tube 5, the casting mold 2 and the After the upper cavity 1, use the vacuum tank 16 to simultaneously evacuate the upper cavity 1 and the lower cavity 12 by 10-30Pa;

[0058] 3. Start the induction smelting device 9 to raise the molten metal to a predetermined ...

Embodiment 3

[0063] 1. Put ZL104A or A357 aluminum alloy raw materials or pure aluminum and intermediate alloys such as Al-Si and Al-Mg into the melting crucible 7 after drying and removing surface impurities, and start the induction melting device 9 to melt the raw materials into 710~ 720°C liquid, and then use the hydraulic lifting platform 10 to lift the melting crucible 7 to such as figure 2 In the position shown, the modification agent is used for modification, and the high-purity argon with a purity greater than 99.99% is used for degassing and then slag removal;

[0064]2. After removing slag, use the hydraulic lifting platform 10 to lower the melting crucible 7 to the induction heating device, such as image 3 As shown, the middle plate 4 is closed, and after the infusion tube 5, the casting mold 2 and the upper cavity 1 are installed, the upper cavity 1 and the lower cavity 12 are separated by the vacuum tank 16 Simultaneously vacuum 20-40Pa;

[0065] 3. Start the induction sme...

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Abstract

The invention provides a differential pressure anti-gravity mold-filling solidification device under the action of an external field and a process method thereof. The differential pressure anti-gravity mold-filling solidification device under the action of the external field comprises a solidification cavity, a high pressure part, a low pressure part and a vacuum part, wherein the solidification cavity comprises an upper cavity and a lower cavity; a casting mold is arranged in the upper cavity; the upper cavity and the lower cavity are connected through a middle plate; a liquid conveying pipeis arranged between the upper cavity and the lower cavity; the liquid conveying pipe penetrates through the center of the middle plate; a hydraulic lifting platform is arranged at the lower end of thelower cavity; a smelting crucible is arranged at the upper end of the hydraulic lifting platform; an induction smelting device is arranged at the bottom of the lower cavity; an electromagnetic foot stirring device is arranged at the upper end of the induction smelting device; and the lower cavity is provided with an induction electric inlet at the corresponding position of the electromagnetic foot stirring device and the induction smelting device. According to the differential pressure anti-gravity mold-filling solidification device under the action of the external field and the process method thereof provided by the invention, a vacuum and electromagnetic coupling external field treatment device and a differential pressure anti-gravity mold filling and solidification method thereof are mainly utilized, and an electromagnetic field and a vacuum field are applied to the melt, so that gas in the melt is effectively removed, inclusions are promoted to float upwards, and a uniform and fine casting structure effect is achieved.

Description

technical field [0001] The invention relates to the technical field of low-pressure casting, in particular to a differential pressure anti-gravity mold filling and solidification device and a process method under the action of an external field. Background technique [0002] Low-pressure casting technology is a casting technology between pressure casting and gravity casting, and is mainly used in low-pressure casting of non-ferrous metals. This technology has the advantages of high raw material utilization rate, less casting defects, less oxidized inclusions, high dimensional accuracy, and easy adjustment of casting speed. However, the castings obtained by the low-pressure casting method have poor solidification structure uniformity and coarse grains, which seriously reduce the performance of the castings. [0003] Grain refinement is an important method to improve the performance of castings. For the most widely used aluminum alloy castings, Al-Ti alloy or Al-Ti-B alloy g...

Claims

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Application Information

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IPC IPC(8): B22D18/04B22D18/06B22D27/15B22D27/02
CPCB22D18/04B22D18/06B22D27/02B22D27/15
Inventor 管仁国付莹姜巨福陈强
Owner DALIAN JIAOTONG UNIVERSITY
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