Vacuum pumping system for die cavities of die-casting dies

Abstract

The invention relates to a vacuum pumping system for die cavities of die-casting dies. The vacuum pumping system solves the technical problem that the vacuum pumping cost of an existing die cavity is high. The vacuum pumping system comprises a plurality of die-casting dies, wherein a feeding passage, a Y-shaped vacuum pumping passage, a branch pipe, a vacuum cylinder barrel, a main pipe, a vacuum tank and a vacuum pumping device are arranged on each die-casting die, a piston body is arranged in each vacuum pumping cylinder barrel in a sliding mode, each piston rod is connected with a driving mechanism, a vacuum stop valve is arranged between each vacuum pumping passage and the corresponding feeding passage, a main pipe electronic control valve is connected onto each main pipe, a branch pipe electronic control valve and a first one-way valve are respectively connected onto each branch pipe, and a second one-way valve is arranged between each die cavity and the corresponding vacuum pumping cylinder barrel. The vacuum pumping system for the die cavities of the die-casting dies has the advantages that the cost is low, one vacuum pump can realize vacuum pumping of a plurality of die cavities, the vacuum is pumped in a double-choice mode, the vacuum pumping difficulty is low, and molten metal is unlikely to enter vacuum pipelines.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment, and in particular relates to a die-casting mold cavity vacuuming system. Background technique [0002] Die casting is a forming process in which liquid metal fills the mold cavity at a very high speed under the action of high pressure, and cools and solidifies under the action of pressure to obtain castings. Since the molten metal fills the cavity in a high-speed spray state, most of the gas in the cavity cannot be discharged in time, and is inevitably involved in the molten metal and remains in the die-casting part in the form of pores, resulting in the formation of a relatively large amount of gas in the die-casting part. Serious porosity defects, there are certain problems in the internal quality of the product, in order to improve the internal quality of the product in the die-casting forming technology, avoid most of the gas in the cavity being involved in the molten metal durin...

AI Technical Summary

Problems solved by technology

[0004] The above solution has improved some problems in the existing technology to a certain extent, such as the problem of incomplete vacuuming, but there are still some problems: complex structure, high cost, each cavity needs to be equipped with a separate vacuum pump, and the molten metal is easy to enter Technical problems such as vacuum pipes

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