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Title: Experimental study of the temperature fields during orthogonal machining of 1018 steel at low rake angles

By: K.M.Vernaza Pena. J.J.Mason and Ming Li.

Date: July 7-11,2003

Publication: plasticity 2003: Tenth international symposium, Quebec City, Canada.

Abstract:
A modified split-Hopkinson bar apparatus is employed to perform orhogonal machining of 1018 steel, and an array of HgCdTe high-speed infrared detectors is used to experimentally measure the temperature field distribution at the surface of the workpiece during the cutting process. When cutting steel, a high melting-point metal, the heat generated due to plastic deformation and friction imposes constraints on the rate of metal removal and on the tool performance. In this study, the effect of low and negative rake angles on the temperature field generated during machining of 1018 steel is examined. Three different rake angles are employed: -5, 0 and +5 degrees at a constant speed of 30m/s and a constant depth of cut of 0.25 mm. It is seen that the rake angle affects the maximum temperature as well as the distribution of the temperature field in the chip. For a cutting speed of 30m/s, the maximum temperature decreased with increasing rake angle from 519oC for -5o rake angle to 337oC for 0o rake angle and 300oC for +5o rake angle. It is observed that as the rake angle increases, the primary shear zone in the workpiece contributes less to the temperature distribution and the friction at the tool/chip interface dominates.