Machining method of small-caliber ball valve

Abstract

The invention provides a machining method of a small-caliber ball valve. The method can be suitable for small-caliber ball valves of DN6-DN40 and the like. The machining method of the invention comprises the following steps that: a bar obtained after heat treatment is subjected to semi-finish turning, so that a rough material piece with a ball part and a ball handle is obtained; the finish turningof the spherical surface of the small-caliber ball valve can be achieved on a universal spherical finish turning machine, or the spherical surface finish turning of a ball of which the inner hole isnot through hole can be performed, and extra finish turning equipment is not needed, cost is saved; and an inner hole, a crescent groove and a vent hole are respectively machined by means of differenttools, so that machining precision is ensured.

Description

technical field [0001] The invention relates to the field of processing ball valves, in particular to a processing method for small-diameter ball valves. Background technique [0002] Ball valve, the opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for the regulation and control of fluids, among which the hard-sealed V-shaped ball valve has a strong shear force between its V-shaped ball core and the metal valve seat of surfacing welding carbide, and is especially suitable for fibers and tiny solid particles. etc. medium. [0003] In the production process of the ball valve body, the nominal diameter of the ball valve ranges widely. Generally, processing enterprises have a certain range of processing capabilities. Machine tools to produce too large or too small spheres) put forward higher requirements. [0004] The following steps are usually used for the processing of the ball valve ball: the fi...

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Problems solved by technology

[0004] The following steps are usually used for the processing of the ball valve ball: the first step is to process the inner hole of the ball, so that the inner hole can be supported by the expansion sleeve and the spherical surface can be finished with a general ball car, but the small-caliber ball such as DN6 is too small. , a very small expansion sleeve is required, resulting in a thinner shaft used to fix the expansion sleeve, resulting in insufficient strength of the shaft. Conventional processing methods cannot meet the processing of small-diameter spheres, especially for some spheres whose inner holes are not through holes. Conventional method cannot finish turning its sphere

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