High-pressure spraying cooling casting forming process

Abstract

The invention relates to the technical field of automobile part casting, and discloses a high-pressure spraying cooling casting forming process. The high-pressure spraying cooling casting forming process includes the steps that a mold is closed, a holding furnace is subjected to five-section pressurizing and pressure maintaining, and molten aluminum in the holding furnace is subjected to mold filling; and pressure is released 230+ / -20 s after pressure maintaining, natural cooling is carried out for 50+ / -10 s, the mold is opened, and a product is taken out. In the low-pressure casting process,by means of heat insulating passageways of an upper mold body and a lower mold body, the molten aluminum between an upper mold plate and a lower mold plate and the molten aluminum between an upper mold core and a lower mold core are kept at a temperature difference; and the molten aluminum between the upper mold plate and the lower mold plate is solidified, the molten aluminum between the upper mold core and the lower mold core is kept in a liquid state, the molten aluminum conveniently flows back to the holding furnace during pressure release, thus, a wheel cavity is formed between the uppermold core and the lower mold core, and the utilization rate of the molten aluminum is effectively increased.

Description

technical field [0001] The invention relates to the technical field of auto parts casting, in particular to a high-pressure spray cooling casting molding process. Background technique [0002] The wheel hub is the part of the vehicle used to connect the tire to the axle, usually by low-pressure casting. A mold for casting a hub mainly includes an upper mold, a lower mold, a side mold and a base, the upper mold, the lower mold and the side molds enclose a hub cavity, and the lower mold and the side molds are fixed on the base. The sprue on the lower mold communicates with the holding furnace filled with molten aluminum. During low-pressure casting, the holding furnace is pressurized so that the aluminum liquid enters the hub cavity under pressure, and the pressure is maintained for a period of time until the entire hub is completed and completely solidified. [0003] There are still some defects in the existing low-pressure casting method of wheel hubs: (1) After the existi...

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Problems solved by technology

[0003] There are still some defects in the existing low-pressure casting method of wheel hubs: (1) After the existing low-pressure casting of wheel hubs is pressurized to fill the mold cavity with liquid aluminum, the pressure is maintained for a certain period of time, and the mold is opened after the molten aluminum in the entire hub cavity is completely solidified. After the mold is opened, it is necessary to process the position of the center hole of the product, and remove the aluminum material at the position of the center hole to form the center hole

This kind of low-pressure casting consumes a lot of molten aluminum, and the casting cost needs to be reduced

(2) When the aluminum liquid fills the wheel hub cavity, the gas in the wheel hub cavity cannot be completely removed, and it is easy to cause defects such as air bubbles and pits on the surface of the hub produced, which seriously affects the appearance of the product, and even affects the strength of the product, resulting in waste products or defective

However, the diameter of the air inlet and outlet of the traditional exhaust plug is the same, and the exhaust range is small, so it is necessary to install multiple exhaust plugs, resulting in more parts in the mold exhaust system and a higher probability of failure; the inside of the exhaust plug is The long and narrow columnar structure is easy to cause blockage and difficult to clean

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