Cross hinge type electric spark micro inverted cone hole machining mechanism

Abstract

The invention provides a cross hinge type electric spark micro inverted cone hole machining mechanism. The mechanism comprises one guider chuck, wherein a guider is arranged in the guider chuck, an electrode wire penetrates through the guider, and the guider chuck is arranged on one swing frame; the swing frame (11) is arranged on one U-shaped middle plate through one first hinge structure, the U-shaped middle plate is arranged on a rack through one second hinge structure, the axes of the two hinge structures intersect at one point to form a cross hinge structure, and the intersection point isa working intersection point where the electrode wire penetrates through the guider; one bearing hole is formed in the rack, the axis of the bearing hole is perpendicular to and intersects with the axis of the second hinge structure of the U-shaped middle plate at one point, one rotating shaft is arranged in the bearing hole, one rotating shaft eccentric hole is formed in the rotating shaft, oneeccentric shaft is arranged in the rotating shaft eccentric hole, and a positioning structure is arranged between the eccentric shaft and the rotating shaft; and one eccentric shaft hole is formed inthe eccentric shaft, and the other end of the guider chuck is matched with the eccentric shaft hole through one universal ball bearing. The mechanism ensures that a cone vertex does not deviate, workis stable, and the machining precision of an inverted cone hole and the precision retentivity of the mechanism can be improved.

Description

Technical field [0001] The invention belongs to the technical field of special processing, and in particular relates to a cross hinge type electric spark micro inverted taper hole processing mechanism. Background technique [0002] As the core component of the fuel injection system, the fuel injection nozzle has a very important influence on the exhaust emission of the engine by the shape and dimensional accuracy of its nozzle. In order to improve the atomization effect of the nozzle and the discharge coefficient of the nozzle hole, the diameter of the nozzle hole has been reduced to 0.1-0.2mm, and the shape of the nozzle hole is "inverted cone" form. Because micro EDM has the advantages of no macro cutting force, no burrs, high precision of the nozzle hole size, and the ability to machine inverted taper holes, EDM has played an increasingly important role in the processing of fine nozzle holes. [0003] At present, the micro-inverted taper hole EDM mechanism mainly adopts two str...

AI Technical Summary

Problems solved by technology

The rotating shaft structure is the lower end of the rotating shaft plus a tilting mechanism to install the guide. The intersection point between the center of the electrode wire in the guide and the axis of the rotating shaft is the pivot point. Because the rotating shaft has vibration, the vibration is not stable, so the axis line changes. It is not fixed, and the guide will also wear, and the position of the cone top cannot be stable. This kind of vibration and wear will affect the hole size, so the machining accuracy of the reverse taper hole of this structure is not high, and the accuracy retention is also poor. poor

The spherical hinge structure is a combination of a hemispherical hinge and an eccentric swing rod. The spherical center of the spherical hinge becomes the apex of the cone. The most commonly used is the cooperation of the hemispherical surface and a circumferential line of the edge of the inner hole. Because the contact surface is very small, the spherical degree is very reflected. Obviously, this kind of cooperation is realized under forceful locking, and it is sliding friction, which is very prone to wear. After wear, the position of the taper point will shift, resulting in poor machining accuracy of the reverse taper hole.

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