Eccentric jacking block and machining method of ball body with two-way eccentric spherical surface

Abstract

The invention discloses an eccentric jacking block and a machining method of a ball body with a two-way eccentric spherical surface. The eccentric jacking block comprises a jacking block body, wherein a center positioning member and at least one pair of peripheral positioning members are arranged on a first surface of the jacking block body, and each pair of peripheral positioning members are symmetrical to the center of the center positioning member; and a jacking needle hole is formed on a second surface, opposite to the first surface, of the jacking block body, and the vertical distance from the center of the jacking needle hole to that of the center positioning member is equal to the eccentricity of the two-way eccentric spherical surface. The machining method can be used for machining the two-way eccentric spherical surface by virtue of the feature that the positions of the peripheral positioning members are unchanged while the jacking needle hole is eccentric reversely after theeccentric jacking block rotates 180 degrees, in combination with the operation of forming process holes matched with left and right eccentric jacking blocks on a spherical base body. The machining method based on center hole positioning, disclosed by the invention, has the advantages of being easy in operation, improving the machining accuracy, further improving the sealing property, prolonging the service life of ball valves, shortening the manufacturing time of the ball valves and reducing the production cost of the ball valves.

Description

technical field [0001] The invention relates to a processing technology for a ball of a bidirectional eccentric metal-sealed ball valve, in particular to a processing step for forming a bidirectional eccentric ball and a fixture used in the processing step. Background technique [0002] The authorized announcement number is CN 201836435U, and the authorized announcement date is May 18, 2011. The Chinese utility model patent discloses a top-mounted bidirectional eccentric metal hard-sealed ball valve; the authorized announcement number is CN201810804U, and the authorized announcement date is April 27, 2011. The Chinese utility model patent of 1999 discloses an all-metal two-way eccentric ball valve; the authorized announcement number is 201696647U, and the authorized announcement date is January 5, 2011. The Chinese utility model patent discloses a double-sided double eccentric ball valve; and, the authorized announcement The expired Chinese utility model patent No. CN 240396...

AI Technical Summary

Problems solved by technology

[0004] The two-way eccentric spherical surface processed by the current processing method has the problems of low position and eccentricity accuracy and low parallelism accuracy of the sealing surfaces on both sides, which cannot truly meet the above requirements

Therefore, the processed ball is either a waste product or has poor sealing performance. If it is manually repaired, it requires high fitter operation skills, and the working hours are long, labor-intensive, and costly. However, the sealing performance of the ball valve still cannot reach the ideal value. , even through high-end processing equipment and complex tooling, this problem cannot be really solved. It can only relatively improve the eccentricity accuracy, and also greatly increase the production cost, which is not conducive to the popularization and application of ball valves.

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