Low-pressure casting die of aluminium alloy wheel and casting method thereof

Abstract

The invention discloses a low-pressure casting die of an aluminium alloy wheel and a casting method thereof. The low-pressure casting die comprises a top die (1), a bottom die (2) and a side die (3), wherein a plurality of gates (4) are arranged on the bottom die (2); the center of the top die is provided with a central riser (6) which is used for feeding; the center of the bottom die is provided with a shunt cone (7) which is used for forming the center of a wheel disc, and the gates are arranged at the outer side of the lower wheel lip of the bottom die or at the window of the bottom die. The casting method comprises the following steps of mold filling, exhausting, pressurization, cooling, feeding, aluminium liquid reflux and the like. By using the invention, the quality of casting parts is increased, the mechanical property index of produced vehicle wheel spokes and wheel centers is good, and pinholes do not easily appear on products. The invention can be suitable for occasions with high requirements for product quality, is beneficial to achieving the light weight of the products, improves production efficiency, and reduces die erosion.

Description

Technical field: [0001] The invention relates to the field of aluminum alloy casting, in particular to a low-pressure casting mold for an aluminum alloy wheel and a casting method thereof. Background technique: [0002] At present, the manufacturing methods of aluminum alloy wheel blanks at home and abroad include forging, spinning after casting, squeeze casting (liquid die forging), differential pressure casting, low pressure casting and gravity casting. Due to reasons such as investment cost and process maturity, low-pressure casting and gravity casting are mostly used in China. The low-pressure casting process is: in a sealed holding furnace, a certain amount of dry compressed air is introduced to make the aluminum liquid rise along the riser pipe under the action of the gas pressure, enter the mold cavity smoothly through the gate, and keep the heat preservation The gas pressure on the liquid surface in the furnace until the casting is completely solidified; then the ga...

AI Technical Summary

Problems solved by technology

However, high mold temperature casting, low-strength cooling or delayed cooling often affect the quality of castings, such as: the produced wheel ribs and wheel centers have poor mechanical properties, and the products are prone to pinholes; the produced products are difficult to apply In occasions that require high product quality, it is not conducive to the realization of product lightweight, but also reduces production efficiency and accelerates mold corrosion

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