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Title: experimental temperature fields in aluminium during orthogonal cutting under different rake angles

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

Date: October 12-15, 2002.

Publication: 10th JSME materials and processing conference, Honolulu, Hawaii

Abstract:
A modified split Hopkinson bar apparatus is employed to perform orthogonal mchining of 6061-T6 aluminium alloy, and an array of HgCdTe high-speed infrared detectors is used to experimentally measured the temperature field distribution at the surface of the workpiece during this process. The effect of rake angle on the temperature field is examined. Three different rake angles are employed, 5, 10 and 15 degrees, with two cutting velocities of 30m/s and 45m/s at a constant depth of cut of 0.5mm. it is seen that the rake angle can vary both 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 an increase in rake angle from 251oC for 5o rake angle to 237oC for 10o rake angle and 196oC for 15o rake angle. 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. it is also seen that as the cutting speed increases, maximum temperatures increase and a larger area of the workpiece is affected by the heat generation. for a 5o rake angle, the maximum temperatures increased from 251o at 30m/s to 290oC for 45m/s cutting speed.