A wheel hub squeeze casting device and method integrating precise temperature control and pulsed magnetic field

Abstract

The invention discloses a hub squeeze casting device and method integrating precise temperature control and a pulsed magnetic field. The device comprises an upper die, a cooling water pipe, the pulsed magnetic field, side dies, a high heat-sink cooling water pipe, a lower die, a workbench, a squeezing plunger chip, an upper die fixing plate, an ejector rod, guide rails, a heating pipe, a casting, a pouring cup, a liquid increasing pipe, a temperature sensor and a sealing device. The hub squeeze casting method comprises the steps that before molten metal is introduced into a cavity, the heating pipe is used for preheating the middle part of a spoke of a die; after filling of the cavity through the molten metal is completed, the hot joint position of the die is cooled in a manner of combining the high heat-sink cooling water pipe and the cooling water pipeline; and meanwhile, dendritic crystal formed in the middle portion of the spoke at the early time is broken through the action of the pulse magnetic field so that smoothness of channel feeding through the molten metal can be guaranteed and grains can be refined, and under the action of the pulse magnetic field, dendritic crystal formed on a rim and a wheel center portion at the early time are also broken, and grains are refined. The purpose of sequential solidification of the hub casting under the squeezing pressure is achieved, the defects of casting shrinkage cavities and shrinkage porosities are reduced, the casting grain sizes are reduced, and the comprehensive mechanical performance of the casting is improved.

Description

technical field [0001] The invention belongs to the field of metal casting forming technology and moulds, in particular to a wheel hub squeeze casting device and method integrating precise temperature control and pulse magnetic field. Background technique [0002] Typically, factories produce wheel castings using a low-pressure casting process. However, parts produced by traditional low-pressure casting often have problems such as low yield strength and elongation. The wheel hub produced by traditional low-pressure casting tends to have a large tendency to shrinkage and porosity in the center of the wheel, the rim, and the intersection of the spoke and the rim. [0003] At present, low-pressure casting molds for hubs generally only contain pure water cooling or air cooling, and cooling pipes are usually arranged in the mold around the casting based on experience. The position of the pipeline arranged by experience is often not the most reasonable position, and the improvem...

AI Technical Summary

Problems solved by technology

The mechanical properties of the spokes, hubs and junctions of spokes and rims of low-pressure cast wheels are relatively low

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