LOW PRESSURE MULTI-DESCENT CASTING PROCESS AND ALUMINUM ALLOY WHEEL DEVICE

Abstract

Disclosed are a low-pressure casting multi-sprue process and device for an aluminum alloy wheel. A multi-sprue casting method is adopted, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum, and is pressurized and cooled after the mold cavity is full of the molten aluminum. During cooling, starting from the outer rim of the wheel filled with the molten aluminum last, side mold ring water coolers are started. The outer rim begins to solidify in the cooling process, and the spokes and the rim are simultaneously solidified in sequence, so that the crystallization and solidification time of the casting at the rim and the spokes is greatly shortened, the compactness of the internal structure of the casting is improved while the production efficiency is improved, the mechanical properties of the materials are good, and particularly, the elongation of the spokes is greatly improved.

Description

Field of the Invention

[0001] The present invention provides a low-pressure casting multi-sprue process and device for an aluminum alloy wheel.Background of the Invention

[0002] At present, the conventional low-pressure casting of aluminum alloy wheels mostly adopts a center bottom injection process. Molten aluminum enters a mold cavity through a center sprue, flows across the spokes of a wheel, and then turns to fill the rim vertically, until the filling is completed. In the process of crystallization and solidification, the rim is at a distal end far away from the center sprue and is solidified first. Therefore, it is necessary to preferentially feed the rim by the spokes to delay the crystallization and solidification time of the spokes, which affects the mechanical properties of the aluminum alloy wheel materials. Particularly, the elongation of the spokes is generally low, which directly affects the overall quality of the wheel.Summary of the Invention

[0003] The object of the present invention is to overcome the defects of the prior art, improve the quality of an aluminum alloy wheel and provide a low-pressure casting process and device for an aluminum alloy wheel, which focus on improving the elongation of spokes of the wheel and improving the casting production efficiency at the same time.

[0004] The technical solution adopted by the invention is: a low-pressure casting multi-sprue process for an aluminum alloy wheel adopts a multi-sprue casting method, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum, and is pressurized and cooled after the mold cavity is full of the molten aluminum.

[0005] During cooling, starting from the outer rim of the wheel filled with the molten aluminum last, side mold ring water coolers are started, and the water coolers are close to the thick portions of the junctions of the spokes of the outer rim and the rim. Top mold coolers are also ring water coolers, the water coolers are located on a top mold above the spokes, and a center water cooler is adopted in the center of the top mold to cool the center sprue.

[0006] By controlling the cooling time and the flow rate, the molten aluminum in the cavity crystallizes in sequence with the cooling of the mold. The crystallization progresses from the outer rim to the rim and the spokes at the same time until the inner rim and the center of the wheel are finally solidified, completing the entire casting process.

[0007] In the low-pressure casting process, the front sides of the spokes and the outer rim of the wheel casting are upward, and the rim and the inner rim are at the lower part.

[0008] The plurality of sprues at the inner rim are arranged directly below the inner rim, the sprues are circular, and the number of the sprues varies according to the size of the wheel and is at least 8.

[0009] The center sprue is arranged directly below the center of the wheel, and is circular.

[0010] The side mold ring water cooler and the top mold ring water cooler are 15-40 mm away from the surface of the casting, and the flow rate of the cooling water is 150-400 L / hr.

[0011] A low-pressure casting device for an aluminum alloy wheel includes a cooling forming mold system and a pressure casting system, the casting device includes a multi-sprue mold, the lower part of the mold communicates with a sprue basin and is fixedly mounted on a machine bed plate, a low-pressure holding furnace is below the machine bed plate, and the molten aluminum in the furnace is connected to the central inlet of the sprue basin via a riser tube.

[0012] Atop mold and a side mold of the low-pressure casting mold are connected with a hydraulic control system of a machine, and the top mold is provided with an ejection mechanism for de-molding the casting.

[0013] A plurality of sprues are arranged at the junction of the sprue basin and the mold, a sprue bushing made of ceramic is arranged at each sprue, and the molten aluminum is finally crystallized and solidified at the sprue in the pressure feeding phase after filling of the molten aluminum.

[0014] Since a plurality of small sprues are arranged below the inner rim of the wheel and a center sprue is arranged in the center of the wheel at the same time, the filling time of the molten aluminum is shortened by half and the filling production efficiency is improved; the outer rim begins to solidify in the cooling process, and the spokes and the rim are simultaneously solidified in sequence, so that the crystallization and solidification time of the casting at the rim and the spokes is greatly shortened, the compactness of the internal structure of the casting is improved, the mechanical properties of the materials are good, and particularly, the elongation of the spokes is greatly improved; at the same time, the entire casting device is simple; and a sprue basin is added on the basis of ordinary low-pressure center casting, so that the whole process is simple and easy to operate.Brief Description of the Drawing

[0015] The present invention will be further illustrated below in conjunction with the drawing and embodiments.

[0016] Fig. 1 is a casting schematic diagram of a low-pressure multi-sprue process according to the present invention.Detailed Description of the Embodiments

[0017] In Fig. 1, a low-pressure casting multi-sprue process device for an aluminum alloy wheel according to the present invention mainly includes a mold cooling system and a pressure casting system. The casting mold includes a bottom mold (2), atop mold (4), a side mold (3) and a casting ejection rod (8). The entire mold is placed on a sprue basin (1). The mold cavity communicates with the sprue basin through a plurality of sprue bushings (11). The sprue basin is assembled on a machine bed plate (12) of a low-pressure casting main machine, a riser tube (13) is mounted therebetween to communicate with molten aluminum in a holding furnace (14), and the molten aluminum enters the sprue basin under the action of pressure through the riser tube, and then enters the mold cavity through the sprue bushings.

[0018] The mold cooling system includes side mold ring water coolers (9) and (10), top mold ring water coolers (6) and (7) and a center sprue spreader water cooler (5). The side mold ring water coolers are quickly started after the mold is full of the molten aluminum, a casting begins to crystallize and solidify at the outer rim, and the top mold ring water coolers and the center water cooler are sequentially started until the casting is solidified in sequence.

Claims

1. A low-pressure casting multi-sprue process for an aluminum alloy wheel, characterized in that the casting process adopts a multi-sprue casting method, and a plurality of sprues are arranged at the end of the inner rim of a wheel, so that molten aluminum enters the inner rim first, and then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum; during cooling, starting from the outer rim of the wheel filled with the molten aluminum last, side mold ring water coolers are started, and the water coolers are close to the thick portions of the junctions of the spokes of the outer rim and the rim; top mold coolers are also ring water coolers, the water coolers are located on a top mold above the spokes, and a center water cooler is adopted in the center of the top mold to cool the center sprue.

2. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, characterized in that in the low-pressure casting process, the front sides of the spokes and the outer rim of the wheel casting are upward, and the rim and the inner rim are at the lower part.

3. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, characterized in that a plurality of sprues are arranged directly below the inner rim, a center sprue is arranged in the center, and the sprues are circular.

4. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, characterized in that side mold ring water coolers and the top mold ring water coolers are 15-40 mm away from the surface of the casting, the flow rate of cooling water is 150-400 L / hr, and the side mold ring water coolers need to be started immediately after the mold cavity is full of the molten aluminum.