Fixture and method for electric discharge machining of special-shaped hole

Abstract

The invention relates to a jig and method for electric discharge machining of special-shaped holes. The fixture includes: a locking sealing sleeve, a special-shaped electrode fixing sleeve, a special-shaped electrode and a cylindrical electrode; one end of the locking sealing sleeve is provided with a fixing sleeve, one end of the cylindrical electrode is set in the fixing sleeve, and the other end of the locking sealing sleeve is used for connecting EDM processing equipment; both the special-shaped electrode fixing sleeve and the special-shaped electrode are hollow, one end of the special-shaped electrode is sleeved in the special-shaped electrode fixing sleeve, and the other end protrudes from the special-shaped electrode fixing sleeve to form the processing end of the special-shaped electrode; the special-shaped electrode is fixed The end of the sleeve away from the special-shaped electrode is set with a cylindrical electrode and is movably connected with the locking sealing sleeve. The special-shaped electrode fixing sleeve moves back and forth along the extension direction of the cylindrical electrode. The cylindrical electrode passes through the special-shaped electrode fixing sleeve and the special-shaped electrode, and the cylindrical electrode protrudes out of the special-shaped The electrode processing end forms a cylindrical electrode processing end.

Description

technical field [0001] The invention relates to the field of electric discharge machining of special-shaped holes, in particular to a jig and method for electric discharge machining of special-shaped holes. Background technique [0002] EDM technology is one of the special processing technologies. It mainly uses the high-temperature ablation phenomenon generated by the non-contact pulse EDM between the tool and the workpiece to remove the metal of the workpiece to achieve the purpose of processing a specific structure. It is widely used in various Machining of difficult-to-cut materials and complex feature structures. At present, military and civilian parts such as aero-engine turbine blades have been designed with special-shaped holes. The special-shaped holes are composed of two parts: a special-shaped end and a round hole end, which are densely distributed on the complex space surface. Dimensional accuracy is required to be high, and conventional methods cannot be proces...

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Problems solved by technology

[0006] The embodiment of the present invention provides a special-shaped hole EDM fixture and method. By improving the original single-structure electrode into a combined electrode with a special-shaped electrode and a cylindrical electrode, it solves the need for frequent replacement and adjustment of traditional electrodes, which affects processing efficiency and consistency. , Step-by-step processing and repeated positioning are difficult, the accuracy and consistency of hole positions are difficult to guarantee, and the technical problems of long production preparation time and low processing efficiency

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