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Vacuum low-pressure casting device and method for large aluminum and magnesium alloy castings

A vacuum low-pressure, magnesium alloy technology, applied in the field of low-pressure casting, can solve the problems of complex equipment, low cost, uncontrollable casting cost, etc., and achieve the effect of high product quality, high production efficiency and simple operation

Inactive Publication Date: 2021-08-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to solve the problem that in the vacuum low-pressure casting process of large castings, the installation of a sealing cover outside the mold leads to complex equipment and the inability to guarantee the quality of large castings and control the casting cost. Vacuum low-pressure casting device for large-scale aluminum and magnesium alloy castings. The device is simple to set up and easy to implement, and can meet the requirements of vacuum low-pressure casting for large-scale castings, and the cost is low

Method used

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  • Vacuum low-pressure casting device and method for large aluminum and magnesium alloy castings
  • Vacuum low-pressure casting device and method for large aluminum and magnesium alloy castings
  • Vacuum low-pressure casting device and method for large aluminum and magnesium alloy castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Vacuum low-pressure casting of a large A356 aluminum alloy casting product. There are 2 exhaust blocks and 2 vacuum channels respectively.

[0048] Specific steps are as follows:

[0049] S1. Control the clamping of the upper mold and the lower mold through the control system, and control the opening of the vacuum pump, flow control valve and vacuum valve to vacuumize the cavity so that the vacuum degree in the cavity is 0.02MPa. (The degree of vacuum in this example is expressed in absolute pressure, the same below.)

[0050] S2. Maintain the vacuum degree in S1, and control the operation of the air pump to pressurize the inside of the crucible so that the air pressure in the crucible reaches 0.06 MPa. The mold is preheated to 170-180°C, and the metal liquid melted to 680°C is filled into the cavity until the cavity is filled;

[0051] S3. After filling the cavity, close the vacuum pump, flow control valve and vacuum valve through the control system, continue to con...

Embodiment 2

[0058] Vacuum low-pressure casting of a large A356 aluminum alloy casting product, with 4 exhaust blocks and 4 vacuum channels respectively.

[0059] Specific steps are as follows:

[0060] S1. Control the clamping of the upper mold and the lower mold through the control system, and control the opening of the vacuum pump, flow control valve and vacuum valve to vacuumize the cavity so that the vacuum degree in the cavity is 0.02MPa;

[0061] S2. Maintain the vacuum degree in S1, and control the operation of the air pump to pressurize the inside of the crucible so that the air pressure in the crucible reaches 0.06 MPa. The mold is preheated to 170-180°C, and the metal liquid melted to 680°C is filled into the cavity until the cavity is filled;

[0062] S3. After filling the cavity, close the vacuum pump, flow control valve and vacuum valve through the control system, continue to control the air pump to pressurize the crucible, increase the air pressure in the crucible to 0.12MP...

Embodiment 3

[0066] Vacuum low-pressure casting of a large A356 aluminum alloy casting product, with 2 exhaust channels.

[0067] Specific steps are as follows:

[0068] S1. Control the clamping of the upper mold and the lower mold through the control system, and control the opening of the vacuum pump, flow control valve and vacuum valve to vacuumize the cavity so that the vacuum degree in the cavity is 0.01MPa;

[0069] S2. Maintain the vacuum degree in S1, and control the operation of the air pump to pressurize the inside of the crucible so that the air pressure in the crucible reaches 0.06 MPa. The mold is preheated to 170-180°C, and the metal liquid melted to 680°C is filled into the cavity until the cavity is filled;

[0070] S3. After filling the cavity, close the vacuum pump, flow control valve and vacuum valve through the control system, continue to control the air pump to pressurize the crucible, increase the air pressure in the crucible to 0.12MPa, and maintain this pressure for...

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Abstract

The invention discloses a vacuum low-pressure casting device and method for large aluminum and magnesium alloy castings. The device comprises a mold system and a casting system. The mold system comprises an upper mold and a lower mold, and at least one exhaust block is arranged on a parting surface of the upper mold and the lower mold. The device further comprises a vacuum system, the vacuum system comprises a vacuum pump, a negative pressure tank and a vacuum pipeline, the vacuum pump is connected with the negative pressure tank, one end of the vacuum pipeline is connected with the negative pressure tank, the other end of the vacuum pipeline extends to the exhaust block and is in sealed connection with the exhaust block, and a cavity can be vacuumized through the vacuum pump; and a control system is further included, is respectively connected with the mold system, the casting system and the vacuum system and is used for controlling the work of the mold system, the vacuum system and the casting system. The device is simple in arrangement, easy to implement, capable of meeting the vacuum low-pressure casting requirements of the large aluminum and magnesium alloy castings and low in cost.

Description

technical field [0001] The invention relates to the field of low-pressure casting, in particular to a vacuum low-pressure casting device and a casting method for large aluminum and magnesium alloy castings. Background technique [0002] Commonly used methods for producing large-scale aluminum alloy, magnesium alloy and other castings mainly include sand casting, pressure casting, and low-pressure casting. Low-pressure casting is a method in which liquid metal is hydraulically injected into the mold to fill the cavity under low pressure to form a casting. Because the metal liquid rises steadily from bottom to top, there will be no splash when filling the mold, and the atmosphere and pressure can be adjusted, so it is especially suitable for alloys such as aluminum and magnesium. [0003] In the production process of the existing low-pressure casting process, because the gas in the mold cavity cannot be completely removed when the metal liquid is filled, part of the gas remai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04B22D18/06B22D18/08
CPCB22D18/04B22D18/06B22D18/08
Inventor 曹韩学谯攀龙思远
Owner CHONGQING UNIV
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