Application of power amplifier ultrasonic elliptical centerless grinding technology research

Experiment name: Application of power amplifier in ultrasonic elliptical vibration centerless grinding test

Purpose:

By comparing the grinding quality of ultrasonic elliptical centerless grinding and ordinary centerless grinding and combining the YAG single crystal grinding removal mechanism, the role of ultrasonic elliptical vibration in the material removal process is analyzed.

Experimental equipment: elliptical vibration transducer, signal generator, ATA-2042 power amplifier.

Experimental process:

Based on the existing conditions in the laboratory, an experimental platform was built on a precision surface grinder. In order to adapt to the grinding of workpieces of various diameters, a grooved inclined slide was placed under the support plate. The slide can be raised and lowered within a range of 10 mm. The support plate was fixed to the plane of the inclined slide groove by bolts. The overall device is shown in the figure. The slide can move freely on the working surface of the grinder. The inclined slide and the ultrasonic elliptical vibration device are fixed by an electromagnetic chuck. The ultrasonic elliptical vibration device is driven by a signal generator after the voltage is amplified by a power amplifier. When the ultrasonic drive device is working, the workpiece can rotate along the axis at the vibration joint.

Ultrasonic elliptical centerless grinding device

Ultrasonic elliptical centerless grinding experimental platform

Experimental results:

The workpiece shown in the figure is obtained by ordinary centerless grinding. The diameter after processing is 1mm. The grinding wheel used in the processing is a cast iron diamond grinding wheel with a grinding wheel grain size of w20. When conducting orthogonal tests, a group of grinding tests without ultrasonic elliptical vibration is set as a comparison. Compare the roughness of a) ordinary centerless grinding, b) non-ultrasonic elliptical grinding and c) ultrasonic elliptical centerless grinding.

Experimental conclusion:

The grinding quality of ordinary centerless grinding and grinding with and without ultrasonic elliptical vibration was compared to verify the role of ultrasonic elliptical vibration in the grinding process, and finally a YAG single crystal micro-cylinder with a surface roughness of Ra0.56um and a diameter of 0.7mm was obtained. By combining the material removal mechanism with the ultrasonic elliptical vibration theory, the normal force of a single abrasive grain on the workpiece during the grinding process was established, and the effect of ultrasonic elliptical centerless grinding on reducing the normal force was theoretically analyzed.