Title: The use of an indirect impact quick-stop mechanism during the turning of α-titanium BT5 alloy
Authors: Olurotimi Akintunde Dahunsi, O.O. Awopetu
Addresses: Department of Mechanical Engineering, Federal University of Technology, P.M.B. 704, Akure, Ondo State, Nigeria. ' Department of Mechanical Engineering, Federal University of Technology, P.M.B. 704, Akure, Ondo State, Nigeria
Abstract: This paper studies the use of an indirect impact quick stop mechanism whose design, construction and mode of operation is relatively simpler in the chip root analysis of α-titanium alloy BT5 in a semi-finish turning operation. The quick-stop was used over a cutting speed range 2–120 m/min, but only micrographs for cutting at 60 m/min were presented, however, the mechanism attained a minimum withdrawal speed of about 3.2 mm/s and an average speed (estimated from the plotted graph) of about 11 m/s. Metallographic analysis of the chip roots presented pronounced Built-Up-Edge (BUE) and segmented chip formation features but the grains varied largely in appearance and shapes. The various chip segments also varied in sizes in contrast to the segments of stainless steel whose chips are usually segmented too.
Keywords: titanium alloys; semi-finish turning; chip root analysis; withdrawal speed; metallographic analysis; built-up edge; BUE; segmented chip; quick stop mechanism; segmented chip formation; stainless steel.
International Journal of Machining and Machinability of Materials, 2008 Vol.3 No.1/2, pp.80 - 90
Published online: 23 Mar 2008 *Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article