Experimental Research On Ultrasonic Vibration Turning Of Slender Shaft

The turning of slender bar has always been a key problem in turning field. Vibration and flexural deformation faces the turning of slender bar. With the development of the military and technology, people are in pursuit of slender bar in high precision. Even though the machining of slender bar has been widely researched at home and abroad, no breakthrough achievement is reached. The domestic machining of slender bar relies on the personal experience of the workers, results in high reject rate. The low production efficiency limits the capacity. Finding an effective way to solve the problem is imminent.Ultrasonic vibration cutting is a relatively new processing way, by adding vibration with high frequency and small amplitude to the tool, the goal of reducing cutting forces and heat, suppressing vibration is reached.The workpiece studied in this thesis is 18Ni(300), with 350 mm in length and 6mm in diameter, the aspect ratio of which is 59.In order to resolve the problem of CNC slant bed lathe is not configured with the follow rest, a self-made follow rest and a clip core clamper is made, making it possible for the machining of slender bar in the CNC slant bed lathe. Combined with ultrasonic vibration turning technology, good effect in slender shaft turning is obtained.The ultrasonic vibration turning technology is introduced. The mechanical models of slender bar mounted in different ways are built and the error in dimension is analyzed. Some experiment was conducted to verify the effectiveness of the self-made follow rest and the clip core clamper. The effects of cutting speed, feed rate and cutting depth on ultrasonic vibration turning of slender bar are studied through experiment.