Abstract
A high-speed photographic study has been made of the chip-tool interface and its evolution when cutting soft metals with optically transparent sapphire tools. The interface has been observed and imaged at high spatial and temporal resolution by using an optical system composed of an optical microscope and a high-speed CCD camera. This has enabled the interface to be observed over a range of cutting speeds between 1 mm/sec and 1 m/sec. The extent of the sliding along the interface and metal transfer to the tool surface are found to have a strong dependence on cutting speed. The characteristics of the interface appear to be unchanged when these metals are machined with high-speed steel or aluminum tools. Lastly, an experimental method to estimate the temperature field over the entire chip-tool interface is described. Preliminary results pertaining to this temperature field are presented.
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