Investment casting equipment for high-precision stop valve and machining process thereof

Abstract

The invention discloses investment casting equipment for a high-precision stop valve and a machining process thereof. The investment casting equipment comprises a base, wherein a first air cylinder isfixedly arranged on one side of the base; the end part of a piston rod of the first air cylinder is connected to a rack through a connecting plate vertically arranged; one side of the rack is in sliding connection with a sliding rail; the sliding rail is fixedly arranged at the top of the base and is parallel to the first air cylinder; a large gear is rotationally connected to the center of the top of the base; the outer diameter of the large gear is in engaged connection with the rack; the center of the interior of the large gear is of a hollow structure; and inner teeth are arranged on theinner diameter of the large gear and are in engaged connection with a pinion gear. Through the arrangement of an upper die, a lower die and a guide hole, the surface of the stop valve can be preventedfrom being uneven, and the prepared stop valve can be high in precision and relatively attractive.

Description

technical field [0001] The invention relates to the technical field of cut-off valves, in particular to investment casting equipment for high-precision cut-off valves and its processing technology. Background technique [0002] Globe valve, also known as cut-off valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the disc, the resistance that the operating force needs to overcome is the friction between the valve stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve stem The diameter of the valve must be large, otherwise the failure of the valve stem to bend will occur. According to the connection method, it can be divided into three types: flange connection, screw connection and welding connection. After the emergence of self-se...

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Problems solved by technology

[0004] In the process of processing the stop valve, it needs to be casted by investment casting equipment, but the existing casting equipment is inconvenient to operate, and it is not convenient to separate the upper and lower molds, and it is not convenient to take out the molding material. At the same time, the cut-off valve prepared by the existing casting equipment The valve is uneven and the accuracy is not high

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