Spark-erosion machininging clamping apparatus square edged orifice of valve housing in electrohydraulic servo valve

Abstract

The invention discloses a processing clamp for electric spark of a square hole of a valve sleeve in an electrohydraulic servo valve, which comprises a basic body of the valve sleeve, a first location shaft, a second location shaft and a splicing nut; the basic body of the valve sleeve is a hollow podetium, the inner cavity of which can lead the valve sleeve to penetrate freely; the middle part of the outer wall of the basic body of the valve sleeve is provided with a long and narrow perforation which is vertical to the axes of the inner cavity and is communicated with the inner cavity; the length of the long and narrow penetration is larger than the space distances of a plurality of square holes on the valve sleeve; the valve sleeve is arranged in the inner cavity of the basic body of the valve sleeve and is sheathed on the front section shaft of a shaft rod of the first location shaft until one end of the valve sleeve is supported on the step surface of the shaft rod; the second location shaft is inserted into the inner cavity of the basic body of the valve sleeve from the other side of the basic body of the valve sleeve; besides, the front section shaft is inserted into a through hole of the valve sleeve until the step surface is supported to the other end of the valve sleeve; the splicing nut and a screw hole of the basic body of the valve sleeve are spirally connected and supported at the back end of the second location shaft.

Description

technical field [0001] The invention relates to a machining fixture for precision small parts, in particular to an electric spark machining fixture for a square hole of a valve sleeve in an electro-hydraulic servo valve. Background technique [0002] The development of electro-hydraulic servo valves in the international professional field has gone through more than 50 years, and the application occasions are becoming more and more extensive. However, the research on domestic servo valves is still in a relatively backward state, especially the machining and manufacturing of important parts is more prominent. Among the many parts, the processing difficulty of the square hole of the valve sleeve is more obvious. Processing has the following defects: [0003] First cut out the outline by wire cutting, leave a small amount of margin, and finally grind to ensure the design requirements (such as four-sided or two-sided coplanarity, smoothness), which is mainly completed by manpowe...

AI Technical Summary

Problems solved by technology

The coplanarity of rough machining (wire cutting) is unstable, the finish is relatively poor, and the roundness of the four corners is relatively large (approximately equivalent to the radius of wire cutting), which requires grinding and trimming, which brings great trouble to finishing (grinding).

Features: Increased workload will inevitably lead to low efficiency, increased processing costs, and reduced output, which cannot meet the current market demand

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