Research On Cutting Temperature In High Speed Milling Of Titanium Alloys

Titanium alloys are widely used in aerospace industry due to their excellent mechanical properties. Because of their little thermal conductivity, high chemical activity, large friction coefficient and so on, the problems occur during the milling operation such as high cutting temperature, large unit force and serious tool wear, leading to low machining efficiency. Taking the titanium alloy TA15 as the research object, the cutting temperature in high speed milling was researched systematically in this paper. At first, the electromotive force of the thermocouple comprised of the titanium alloy TA15 and constantan was obtained by the comparison method, and verified by experiments. Then cutting temperature in high speed milling of titanium alloy TA15 was measured by an embedded semi-artificial thermocouple. The effects of cutting speed, radial depth of cut, feed rate, cooling methods, tool wear and workpiece materials on cutting temperature were studied, as well as temperature changes of cutting edge. The conclusions drawn from the above experiment researches could provide production practice with important indication. Heat source produced in milling was supposed as a movable linear one in this paper. According to cutting conditions, the workpiece surface was regarded as adiabatic boundary, thus the model of heat source was established. With the iterative method of heat source, the temperature distributions of machined workpiece surface during milling were deduced. The theoretical model of heat source was verified by comparing the calculated value with the measured value.