LOW-PRESSURE CASTING MULTI-SPRUE PROCESS AND DEVICE FOR ALUMINUM ALLOY WHEEL

Abstract

The present application relates to 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 flange of a wheel, so that molten aluminum enters at the inner flange first, then enters from a center sprue after a mold cavity at the rim is full of the molten aluminum. The mold assembly is pressurized and cooled after the mold cavity is full of the molten aluminum. During cooling, starting from the outer flange of the wheel filled with the molten aluminum last, side mold ring water coolers are started.

Claims

1. A low-pressure casting multi-sprue process for an aluminum alloy wheel, wherein that the casting process adopts a multi-sprue casting method, and a plurality of sprues are provided at the end of the inner flange of a wheel, so that molten aluminum enters at the inner flange 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 flange of the wheel filled with the molten aluminum last, side mold ring water coolers are started, and the side mold water coolers are close to the thick portions of the junctions of the spokes of the outer flange and the rim; top mold coolers are also ring water coolers, the top mold 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, wherein that in the low-pressure casting process, the front sides of the spokes and the outer flange of the wheel casting are upward, and the rim and the inner flange are at the lower part.

3. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, wherein that a plurality of sprues are provided under the inner flange, the center sprue is arranged under the center of the wheel, and the plurality of sprues and the center sprues are also circular.

4. The low-pressure casting multi-sprue process for an aluminum alloy wheel according to claim 1, wherein 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.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a casting schematic diagram of a low-pressure multi-sprue process according to the present application.

[0017] In figures: 1sprue basin, 2bottom mold, 3side molds, 4top mold, 5center sprue spreader water cooler, 6,7top mold ring water coolers, 8casting ejection rod, 9,10side mold ring water coolers, 11sprue bushing, 12bedplate of the low-pressure casting main machine, 13riser tube, 14holding furnace.

DETAILED DESCRIPTION OF THE INVENTION

[0018] In FIG. 1, a low-pressure casting multi-sprue process and device for an aluminum alloy wheel according to the present application comprise a mold cooling system and a pressure casting system. The low-pressure casting device applies a multi-sprue mold assembly. The multi-sprue mold assembly comprises a bottom mold 2, a top mold 4, side molds 3, and a casting ejection rod 8. The casting ejection rod is provided on the top mold 4. The multi-sprue mold assembly is placed on a sprue basin 1. The mold cavity connects with the sprue basin through a plurality of sprue bushing 11. The sprue basin is assembled on a bedplate of a low-pressure casting main machine 12, and the sprue basin connects with a holding furnace 14 through a riser tube 13. Under the pressure, the molten aluminum in the holding furnace 14 enters into the sprue basin through the riser tube 13, and then enters into the mold cavity through the sprue bushings.

[0019] The mold cooling system comprises side mold ring water coolers 9, 10, top mold ring water coolers 6, 7, and a center sprue spreader water cooler 5. The side mold ring water coolers are quickly started after the mold cavity is full of the molten aluminum, a casting begins to crystallize and solidify at the outer flange, and the top mold ring water coolers and the center sprue spreader water cooler are sequentially started until the casting is solidified in sequence.

[0020] The foregoing descriptions of specific exemplary embodiments of the present application have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.