Counter-pressure casting control system for aluminum alloy hubs

Abstract

The invention discloses a counter-pressure casting control system for aluminum alloy hubs. The system comprises a lower furnace chamber, an upper furnace chamber, an electrical control module and an air intake and exhaust control module. Stable air intake is performed on the upper furnace chamber and the lower furnace chamber simultaneously by the aid of an air pump and a flow regulating valve inthe system, an electrical valve positioner is controlled by the aid of a programmable logic controller (PLC), then a pneumatic proportional regulating valve is controlled, air exhaust of the upper furnace chamber is realized, the high-pressure field and the differential pressure are formed in the upper furnace chamber and the lower furnace chamber, the dendrite feeding effect is improved by the aid of the pressure field, the mechanical properties of castings are effectively improved, the castings have the good adherence to a cavity under the effect of the pressure field, the cooling speed is higher, and the crystal structure is denser; under the effect of the pressure field, the solubility of hydrogen in molten aluminum is effectively increased, separation of the hydrogen as gas pinholes during solidification of the castings is restrained, and the pinholes are reduced obviously; and the counter pressure is formed by the pressure field in the cavity, spraying spattering during filling of molten metal is restrained, and the stable filing effect is better.

Description

technical field [0001] The invention relates to the field of aluminum alloy casting, in particular to an aluminum alloy wheel hub reverse pressure casting control system. Background technique [0002] The practice of aluminum alloy production proves that hydrogen is the only gas that can be dissolved in a large amount in aluminum or aluminum alloys. It is the main cause of pores in aluminum alloys, the most harmful gas in aluminum alloys, and the most soluble gas in aluminum alloys. Pinhole shrinkage defects are generated due to the precipitation of hydrogen during the solidification of castings. Moreover, the solidification and feeding process of the alloy is mainly realized by the flow of molten metal. When the alloy is solidified in a sequential solidification manner, the solid-liquid interface is flat, the feeding resistance of the liquid phase to the interface is small, and the driving force to promote the liquid phase flow is also small, but when the alloy is solidifi...

AI Technical Summary

Problems solved by technology

[0003] In the current aluminum alloy casting technology, the defects of pinholes formed by hydrogen precipitation during the solidification process of the casting cannot be effectively suppressed, and the feeding capacity of the casting can be further improved

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