A Single Excitation Ultrasonic Elliptical Vibration Centerless Grinding Device

Abstract

The invention discloses a single excitation ultrasonic elliptic vibration centerless grinding device which comprises a main grinding wheel, a supporting plate used for supporting a workpiece, a housing unit, an ultrasonic vibration transducer arranged in the housing unit, an elliptic vibration mode converter, a friction plate arranged at the front end of the elliptic vibration mode converter, a lead screw sleeve connected to the housing unit, a ball screw arranged in the lead screw sleeve, a linear guide rail arranged below the lead screw sleeve, a drive motor coaxially connected with the ball screw, and a base arranged below the linear guide rail, wherein the housing unit comprises a front baffle, an inner sleeve and a rear baffle; the ultrasonic vibration transducer comprises a bolt as well as a rear cover plate, a piezoelectric ceramic piece, electrode plates and a front cover plate which sleeve the bolt in sequence; the rear cover plate, the piezoelectric ceramic piece, the electrode plates and the front cover plate are connected and compressed through the bolt; the elliptic vibration mode converter is arranged at the front end of the front cover plate and adopts a straight beam and oblique beam combined structure.

Description

technical field [0001] The invention relates to a centerless grinding device, in particular to a centerless grinding device which uses single excitation ultrasonic elliptical vibration to replace the traditional centerless grinding guide wheel. Background technique [0002] Currently, if image 3 As shown, when centerless grinding is used for cylindrical grinding, the workpiece is placed between the main grinding wheel and the guide wheel, supported by the supporting plate below it, and driven by the guide wheel to rotate. In the traditional centerless grinding technology, in order to obtain ideal shape tolerance, surface accuracy and high processing efficiency, the centerless grinding machine must have high rigidity, relatively large grinding wheel and guide wheel, and the movement of the guide wheel must be precisely controlled . The machining accuracy of the workpiece depends on the roundness and rotation accuracy of the guide wheel. High-precision dressing technology an...

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Problems solved by technology

[0003] In order to solve the problems existing in traditional centerless grinding equipment, the invention patent document with the publication number CN103231287A discloses a centerless grinding device and its application principle, which adopts four piezoelectric ceramics divided into two groups and bonded on elastic metal plates , to drive the friction plate bonded to the front end of the elastic metal plate to perform ultrasonic ellipse, and replace the guide wheel of the traditional centerless grinding equipment. This device method can effectively avoid the roundness error caused by the guide wheel and the rotation error caused by the main shaft of the guide wheel. Effectively improve the rotation accuracy of the workpiece and ensure the grinding quality, but the elliptical vibration in the device needs to use two sets of piezoelectric ceramics to excite vibration modes with a certain phase difference, and each set of piezoelectric ceramics must be equipped with an ultrasonic The driving power signal needs to control the phase difference between the ultrasonic driving power signals. The structure of the ultrasonic vibration system and the control system is complicated, the manufacturing is difficult, the control is difficult, the production cost is high, it is not easy to realize miniaturization, and the working performance is not stable enough. These problems restrict its application and promotion in industrial production

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