Vacuum centrifugal casting method and device

Abstract

The invention discloses a vacuum centrifugal casting method with low sucking rate, which comprises the steps of closing a mold, vacuumizing and centrifuging, casting and demoulding, and is characterized in that: in the step of vacuumizing, a molding mechanism which hermetically rotates is vacuumized; and the molding mechanism comprises a lower die installation seat (7) which is arranged on a transmission shaft (10), wherein a connecting seat (5), a lower die (4), an upper die (17) and an upper die installation seat (3) are connected with and arranged on the lower die installation seat (7) through a guide rod (6); the upper die (17) and the lower die (4) are closed to form a hermetic molding mechanism; and the transmission shaft (10) is a hollow shaft of which one end is communicated with the molding mechanism and the other end is communicated with an exhaust joint (13). The method is feasible; a device has a simple structure; and the inside of a cavity of a casting instead of a seal cover originally is vacuumized, so that vacuum degree is improved, a pouring channel is shortened, the surface finish and compactness of the casting are improved, and particularly good compactness effect during the casting of special-shaped parts is achieved.

Description

technical field [0001] The invention relates to a casting method and device, in particular to a vacuum centrifugal casting method and device. Background technique [0002] Vacuum centrifugal casting is a new type of casting method combining vacuum casting and centrifugal casting. It puts the forming mechanism in a sealing cover, seals the surrounding of the sealing cover with glue or sealing strips as much as possible, and uses foam or plastic at the pouring port. Flowers sealed. Before pouring, the upper and lower molds synthesize the casting cavity and rotate according to the set speed. The vacuum system directly pumps out the gas in the sealing cover and the casting cavity through the air extraction hole of the sealing device to make it reach the predetermined vacuum degree and establish a partial vacuum ( Negative pressure), so that the casting cavity is in a vacuum (negative pressure) state. When pouring, the melt is quickly filled into the vacuum and rotating casting...

AI Technical Summary

Problems solved by technology

However, because the inner space of the sealing cover is too large, the pumping volume is large, and the sealing of the joint of the sealing cover is difficult, and it is difficult to completely seal, which makes it difficult to increase the vacuum degree.

At the same time, due to the existence of the sealing cover, the pouring channel is long, the temperature drops too fast during the pouring process, and the pouring temperature is not easy to control, which is more obvious for pouring small castings

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