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In this paper, the impact of selected cutting parameters (both cutting and feed speed) on the temperature generated in the workpiece being machined during milling is assessed. The investigations were carried out by milling of 41Cr4 alloy steel using disc cutter mill with F40M sintered carbide inserts with the anti-wear coating. The investigations were conducted with the dry cutting manner. During the investigations three cutting speeds and three feed speeds were applied, with a constant depth of cut. In the course of the investigations, the temperature in the machining, the zone was recorded using the Flir SC6000HS infrared camera. As a result of the measurements, the mean temperature in the defined measurement zone was determined, and, based on that, a procedure for the determination of the t W-max maximum temperature in the workpiece being machined has been proposed. Finally, on the basis of the obtained results, it has been found that the increase in cutting speed leads to the increase in the t W-max maximum temperature, whereas the increase in feed speed leads to the reduction of that temperature in the workpiece being machined. Highlights• Application of thermography measurements for the determination of the temperature produced in the workpiece being machined. • Description of the methodology of the determination of the tW-max maximum temperature in the workpiece being machined. • Determination of the impact of both cutting and feed speeds on the tW-max maximum temperature, in the workpiece being machined.

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Abstract. In the paper, chatter vibrations in the cylindrical plunge grinding process are investigated. An improved model of the grinding process was developed which is able to simulate self-excited vibrations due to a regenerative effect on the workpiece and the grinding wheel surface. The model includes a finiteelement model of the workpiece, two degrees of freedom model of the grinding wheel headstock and a model of wheel-workpiece geometrical interferences. The model allows to studying the influence of different factors, i.e. workpiece and machine parameters as well as grinding conditions on the stability limit and a chatter vibration growth rate. At the end, simulation results are shown and compared with exemplified real grinding results.