A kind of processing technology of Verseat

Abstract

The invention provides a processing technology of a valve seat, comprising the following steps: die forging blank, pre-heat treatment, semi-finishing, final heat treatment, surface sandblasting, finishing, the processing method and device design of the valve seat are reasonable, through Forging the blank to improve the material structure can effectively improve the mechanical properties of the material, reduce material costs and processing time. When processing the Ver seat, after the carburizing and quenching of the Ver seat, the traditional grinding process is abandoned to avoid grinding Grinding cracks appear, using turning instead of grinding, the surface roughness of the product can reach Ra0.4.

Description

technical field [0001] The invention belongs to the technical field of plunger pump processing, in particular to a processing technology of a valve seat. Background technique [0002] The valve seat is used in conjunction with the valve body assembly in the hydraulic end valve box of the plunger pump. The inner taper hole on the valve box cooperates with the outer cone surface of the valve box to act as a hard seal. The outer cone surface of the valve box has a The sealing groove at the top is equipped with a sealing ring, which acts as a soft seal. The inner tapered surface of the valve seat is sealed with the rubber of the valve body assembly. Through the upper and lower opening and closing of the valve body assembly, the fluid flow of the plunger pump during operation is realized Suction and discharge function. The processing accuracy of the outer cone surface, sealing groove and inner cone hole of the valve seat directly affects the sealing performance of the valve box ...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used processing method is round steel blanking→drilling→semi-finishing shape→carburizing and quenching→surface sandblasting→grinding the outer cone surface→grinding the inner cone surface. There are some disadvantages in this processing technology: 1. Round steel, large machining allowance, resulting in high processing stress and production cost

2. Without pre-heat treatment, the material structure is loose, the grains are coarse, the mechanical properties of the material are low, and the deformation of the workpiece is relatively large during the final heat treatment

3. The sealing groove of the valve seat is processed before the carburizing and quenching process. After carburizing and quenching, there will be a certain amount of deformation, and the machining accuracy with the outer tapered surface cannot be guaranteed.

4. The inner cone surface and the outer cone surface are finished in two steps of grinding process, the positioning reference is not uniform, each sequence of clamping needs to be corrected, the machining accuracy is not easy to guarantee, and the operation is inconvenient for workers

5. The inner and outer cone surfaces are processed by grinding. During the grinding process, the high-speed rotating grinding wheel will generate high grinding heat on the surface of the workpiece. When the cutting fluid is cooled and lubricated, grinding cracks are easily generated, and, in the clamping For the valve seat, the centering effect is poor and the clamping efficiency is low. Therefore, the invention proposes a processing technology for the valve seat

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