High-performance valve body of proportional servo valve and manufacturing method thereof

Abstract

The invention discloses a high-performance valve body of a proportional servo valve and a manufacturing method of the high-performance valve body of a proportional servo valve. The manufacturing method provided by the invention comprises the following steps of: dividing a cuboid into three sections and milling to three cuboids, respectively processing channels such as a groove, a through hole or a working oil port on each cuboid, combining the three cuboids according to a certain order to carry out combined treatment, and carrying out vacuum brazing to form an integrated valve body. The manufactured valve body comprises a valve body dark cavity, valve body through holes and a working oil port, wherein the valve body through holes are respectively communicated with the valve body dark cavity and the working oil port. The manufacturing method provided by the invention is simple and feasible, the rationality of the shape of each channel in the valve body is ensured, the intensity and the cleanliness of the valve body are improved, and the noise generated in the using process of the valve is reduced, so that the valve body and the valve core are reliably matched. The invention further provides a valve body produced by the manufacturing method.

Description

technical field [0001] The invention relates to a valve body of a proportional servo valve in the field of hydraulic transmission and a manufacturing method thereof. Background technique [0002] Proportional servo valves are widely used in the field of hydraulic transmission. Due to the structural characteristics of many flow channels in the valve body, there are great difficulties in the process of processing and manufacturing the valve body. At present, the following two methods are usually used to manufacture the proportional servo valve body: [0003] 1) Method of casting. The flow channel and the entire valve body can be directly cast by casting, but this manufacturing method has the following disadvantages that are difficult to solve: First, the castings remaining in the numerous oil passages, dark cavities or grooves of the valve body during the casting process The sand is difficult to remove, and the remaining casting sand will cause the valve to be stuck when the...

AI Technical Summary

Problems solved by technology

The flow channel and the entire valve body can be directly cast by casting, but this manufacturing method has the following disadvantages that are difficult to solve: First, the castings remaining in the numerous oil passages, dark cavities or grooves of the valve body during the casting process The sand is difficult to remove, and the remaining casting sand will cause the valve to be stuck when the valve body and the valve core work together, which will lead to system failure; secondly, the burrs generated during the casting process are difficult to remove, and under the action of high pressure, the burrs will be Turning up, this phenomenon will also lead to poor movement or the valve core being stuck during the cooperation between the valve body and the valve core, which will also affect the working reliability of the system; finally, the valve body manufactured by casting method Usually have defects such as pores, sand holes, cracks, etc., so the valve body is easy to leak water or air during use, and the service life is short

This method is to process oil passages, dark cavities and grooves on steel parts. However, due to the complex shape and large number of oil passages, dark cavities and grooves of the high-performance proportional servo valve body, it is difficult to process steel parts. It is very large, usually the processed oil passage and other structures cannot meet the dynamic requirements of fluid flow, and it is easy to produce cavitation and cavitation, which leads to a lot of noise when the proportional servo valve is working, and the manufactured by this method Valve body pressure resistance is not high

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