Processing technique of valve parts in ball valve with hard seal structure

Abstract

The invention relates to a processing technique of valve parts in a ball valve with a hard seal structure. The processing technique is characterized by comprising the following work procedures of: firstly, turning a channel hole; secondly, boring an upper valve shaft hole and a lower valve shaft hole; thirdly, boring two lateral surfaces and a process spigot; fourthly, drilling and taping process threaded holes on two lateral surfaces; fifthly, planning a key groove; sixthly, roughly processing a spherical surface and a surfacing groove; seventhly, surfacing a hard alloy material in the surfacing groove; and eighthly, finishing the spherical surface. According to the invention, due to the adoption of the processing technique, processing work procedures of boring process threaded holes on the upper end face, the lower end face and two end faces at the valve shaft holes are omitted; the time of shifted clamping is saved and the processing period of the part is enabled to be shortened by 2-3 days; when the spherical surface is finished, the processing track of a cutter comprises a single soft surface and a hard surface; and for two processing surfaces, cutters with different hardnesses can be adopted so as to reduce the impact to the cutters and a machine tool, prolong the service lives of the cutters and ensure the processing finish of the spherical surface. Compared with the prior art, the processing technique has the characteristic that tooling equipment dispenses with a positioning disk and a positioning sleeve, thereby saving the manufacturing expense of a mould.

Description

technical field [0001] The invention relates to a manufacturing process of valve parts, in particular to a processing technology of a valve part in a hard-sealed structure ball valve. Background technique [0002] In the technical field of valves, a ball valve with a hard seal structure is a ball valve composed of a valve body, an anti-leakage ring, a valve and a valve shaft. When the valve rotates, it can be fine-tuned in the body cavity of the valve body to reduce the opening torque of the valve. At present, the processing technology of the above-mentioned valve parts is as follows: [0003] 1) Vehicle access hole; [0004] 2) Boring upper and lower valve shaft holes and upper and lower end faces; [0005] 3) Boring both sides and process seam; [0006] 4) Drill and tap the process screw holes located on the upper and lower end faces and both sides; [0007] 5) planing keyway; [0008] 6) The upper and lower valve shaft holes are used as the positioning reference, an...

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned processing process is relatively complicated, the mold conversion between processes is cumbersome, the processing cycle is long, and the processing cost is high. In addition, during the finishing of the spherical surface, the trajectory of the spherical surface is from soft to hard and then to soft. The machine tool has a great impact, which reduces the service life of the tool and makes it difficult to ensure the smoothness of the machined surface

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