ISSN:
1662-7482
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Ultrasonically assisted turning (UAT) is a novel material-processing technology, wherehigh frequency vibration (frequency f ≈ 20kHz, amplitude a ≈15μm) is superimposed on themovement of the cutting tool. Advantages of UAT have been demonstrated for a broad spectrum ofapplications. Compared to conventional turning (CT), this technique allows significantimprovements in processing intractable materials, such as high-strength aerospace alloys,composites and ceramics. Superimposed ultrasonic vibration yields a noticeable decrease in cuttingforces, as well as a superior surface finish. A vibro-impact interaction between the tool andworkpiece in UAT in the process of continuous chip formation leads to a dynamically changingstress distribution in the process zone as compared to the quasistatic one in CT. The paper presentsa three-dimensional, fully thermomechanically coupled computational model of UAT incorporatinga non-linear elasto-plastic material model with strain-rate sensitivity and contact interaction withfriction at the chip–tool interface. 3D stress distributions in the cutting region are analysed for arepresentative cycle of ultrasonic vibration. The dependence of various process parameters, such asshear stresses and cutting forces on vibration frequency and amplitude is also studied
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.5-6.351.pdf
Permalink