Vacuum die casting stopping device and control method thereof

Abstract

The invention discloses a vacuum die casting stopping device and a control method thereof and relates to a die-casting mold accessory and a control method thereof. A conventional stop valve of which the valve body is provided with an oil duct is easily to suck the oil in the oil duct from a gap between a spool and the valve body into an exhaust passage and then enter a mold cavity and an air extracting device during vacuum exhaust, and the function and product quality of the stop valve and the working reliability of the air extracting device are influenced. The vacuum die casting stopping device is characterized in that: an oil valve is arranged between an oil duct oil inlet of the stop valve and an oil outlet of an oil pump and between the oil duct oil inlet of the stop valve and an oil inlet of the oil pump respectively; and a slag removal device is connected at the tail end of an air pipe joint and comprises a gas tank for accommodating high-pressure gas and a first slag removal valve arranged between the air pipe joint and the gas tank. The oil duct of the stop valve is connected with two oil valves, oil can be pumped on the two oil ports, the oil is removed completely, and the product quality is guaranteed. The slag removal device is arranged for removing the slag in the air duct and a cavity and guaranteeing the product quality. By adopting the slag removal twice, due to two-time slag removal, the air duct is subjected to whole-process slag removal, and the slag is removed completely.

Description

【Technical field】 [0001] The invention relates to a die-casting mold accessory, in particular to a vacuum die-casting cut-off device and a control method. 【Background technique】 [0002] Die casting forming process: close the mold, pour the molten metal into the mold cavity, keep the pressure for a period of time, cool and solidify to form, and take out the finished product after opening the mold. During the mold filling process, the gas in the cavity needs to be removed in time to avoid problems such as pores and insufficient pouring. Vacuum exhaust is an effective means to solve this problem. The vacuum stop valve is the main component of the vacuum exhaust system. The vacuum stop valve usually includes a valve body, an exhaust channel set in the valve body and a movable valve core. At the beginning of die casting, the vacuum stop valve exhausts, and the gas is exhausted Once the exhaust is completed, the valve core moves to close the exhaust channel in time. At this time...

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Problems solved by technology

But it brings another problem. During the vacuum exhaust, the oil in the shut-off valve oil passage is easily sucked into the exhaust passage from the gap between the valve core and the valve body and enters the mold cavity and air extraction device, which affects the function of the shut-off valve. , product quality, and the mixture of oil and waste residue is difficult to remove, and it is easy to block the air passage, which seriously affects the reliability of the extraction device.

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