Pressure-regulating and mold-filling high-pressure solidification casting device and casting method

A technology of pressure regulation and high pressure, which is applied in the field of solidification of alloy liquid under the action of high pressure of the hammer head, and in the field of pressure regulation and filling high-pressure solidification casting devices, which can solve the problem of affecting the internal quality and mechanical properties of castings, and the easy formation of entrained gas and oxidized slag , easy to precipitate and form pinholes, etc., to avoid shrinkage porosity, avoid the formation of oxidized slag, and reduce the effect of contact surface

Inactive Publication Date: 2021-03-26
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the die-casting and squeeze-casting processes adopted in China have deficiencies in the transportation, filling and solidification of aluminum liquid: ladles are used to pour aluminum liquid into the barrel, and during the pouring process, the aluminum liquid is continuously in contact with the air to form a large amount of oxidized slag ;When filling the mold, the aluminum liquid flows at high speed in the cavity and has secondary contact with the air, which is easy to form entrained gas and oxide slag; the melt has a large gas content, and it is easy to precipitate and form pinholes when solidified
These deficiencies seriously reduce the quality of molten aluminum and affect the internal quality and mechanical properties of castings

Method used

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  • Pressure-regulating and mold-filling high-pressure solidification casting device and casting method

Examples

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Effect test

Embodiment 1

[0029] This embodiment is the conveying process of molten aluminum for preparing automobile wheel hubs by extrusion casting, and the casting material is ZL114A aluminum alloy.

[0030] The specific process is as follows:

[0031] 1) The highest point of the feed port on the barrel is located 20mm below the bottom of the mold cavity, the vertical height of the feed port is 40mm, the length of the hammer used is 60mm, which is 20mm longer than the feed port, and the initial position of the hammer head is set to be the lowest of the feed port point, the hammer head’s final rising height is 10mm below the bottom of the mold cavity, and the final stop height of the aluminum liquid level is set by calculation to be 20mm below the highest point of the mold cavity;

[0032] 2) After the ZL114A aluminum alloy is refined and transformed in the smelting furnace 3, the mold 1 is closed, the air in the cavity of the mold 1 is extracted, and compressed air is introduced into the smelting fu...

Embodiment 2

[0036] This embodiment is a process of conveying molten aluminum for preparing an automobile control arm by squeeze casting, and the casting material is ZL101A aluminum alloy.

[0037] The specific process is as follows:

[0038] 1) The highest point of the feeding port on the barrel is located 15mm below the bottom of the mold cavity, the vertical height of the feeding port is 20mm, the length of the hammer head used is 40mm, which is 20mm longer than the feeding port, and the initial position of the hammer head is set as the lowest point of the feeding port point, the hammer head’s final rising height is 5mm below the bottom of the mold cavity, and the final stop height of the liquid aluminum level is set by calculation to be 40mm below the highest point of the mold cavity;

[0039]2) After the ZL101A aluminum alloy is refined and transformed in the melting furnace 3, the mold 1 is closed, the air in the cavity of the mold 1 is extracted, and compressed air is introduced int...

Embodiment 3

[0043] A pressure-adjusting and filling-type high-pressure solidification casting device, said device comprising a melting furnace 3, a shot rod 2, a riser pipe 31, a hammer head 21, a barrel 4, a mold 1, a vacuum pipe 5 and a vacuum shut-off valve 13;

[0044] Wherein, the barrel 4 is located below the mold 1, the hammer head 21 is installed above the injection rod 2, and is pushed by the plunger 2 to move up and down in the barrel 4; the melting furnace 3 is placed under the side of the mold 1, and the furnace body Good sealing, one end of the liquid riser 31 goes deep into the crucible in the furnace, and the other end is connected to the barrel 4; the mold 1 is composed of a movable mold 11 and a fixed mold 12, and the upper part of the fixed mold 12 has a hole and is connected to a vacuum stop valve 13. The vacuum tube 5 is connected with vacuum equipment to vacuum the cavity of the mold 1 . The barrel 4 is provided with a lateral feed port 41, and the highest point of th...

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Abstract

The invention discloses a pressure-regulating and mold-filling high-pressure solidification casting device and casting method. The device comprises a smelting furnace, an injection rod, a riser tube,a hammer head, a charging barrel, a mold, a vacuum tube and a vacuum stop valve. By means of the device, a high-quality aluminum alloy melt can be taken from the center of molten aluminum in a smelting furnace, the molten aluminum is conveyed into a mold cavity through the closed liquid riser tube and a charging barrel by controlling a pressure difference between the interior of the smelting furnace and a mold cavity by a computer, and the molten aluminum level stably rises in the whole process, so that the contact area between molten aluminum and air in the conveying and mold filling stages is greatly reduced, oxidizing slag is reduced, and meanwhile, a certain vacuum condition is formed in the mold cavity, so that the air content of the molten aluminum is reduced, and the mold filling capacity of the molten aluminum in the mold cavity is improved. After mold filling is completed, a casting is solidified under a high pressure, the casting is compact in structure and fine in grain, theforming probability of casting defects such as shrinkage porosity, shrinkage cavities and pinholes is greatly reduced, and finally the internal quality of the casting and the mechanical property of abody are greatly improved.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a pressure-regulating and filling high-pressure solidification casting device and casting method, which specifically refers to: using the pressure difference between the cavity and the furnace to transport the alloy liquid to complete the filling of the mold cavity, and then making the alloy liquid in the Apparatus and method for solidification under hammer high pressure. Background technique [0002] Die casting and squeeze casting are widely used in industrial mass production of aluminum alloy castings. Compared with other casting processes, the aluminum alloy castings produced by these two casting processes are stable in size, high in precision, excellent in surface quality, and high in process yield. high productivity. In addition, the strength and mechanical properties of the castings produced by the squeeze casting process are higher than those of the traditional sand cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06B22D18/04B22D27/11
CPCB22D18/06B22D18/04B22D27/11
Inventor 冯志军李泽华李宇飞苏鑫阮明
Owner SHENYANG RES INST OF FOUNDRY
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