Single electric signal excitation ultrasonic elliptic vibration centerless grinding device

Abstract

The invention discloses a single electric signal excitation ultrasonic elliptic vibration centerless grinding device which comprises a main grinding wheel, a support plate for supporting workpieces, a shell unit, an ultrasonic vibration transducer disposed in the shell unit, an elliptic vibration mode converter, a friction plate disposed at the front end of the elliptic vibration mode converter, a screw sleeve connected to the shell unit, a ball screw disposed in the screw sleeve, a linear guide rail disposed below the screw sleeve, a drive motor coaxially connected with the ball screw and a base disposed below the linear guide rail. The shell unit comprises a front retaining plate, a sleeve and a rear retaining plate. The ultrasonic vibration transducer comprises a bolt, and a rear cover plate, a piezoelectric ceramic plate, an electrode plate and a front cover plate which sequentially sleeve the bolt. The elliptic vibration mode converter is disposed at the front end of the front cover plate and the whole elliptic vibration mode converter is cylindrical. Three staggered rectangular notches are formed in the upper and lower sides of the elliptic vibration mode converter.

Description

technical field [0001] The invention relates to a centerless grinding device, in particular to a centerless grinding device which utilizes a single electric signal excitation to generate ultrasonic elliptical vibration structure to replace the traditional centerless grinding guide wheel. Background technique [0002] Currently, if figure 1 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...

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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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