The machining processes Turning, Milling and Drilling

Abstract:- The aims of the investigations presented in this paper were to measure the tool load under conditions of drilling and to analyze if changes of the cutting edge shape and profile significantly influence the edge stresses. The described methods to analyze the influences of edge shape modifications will contribute to the optimization of drilling tools. Based on a specific cutting edge shape of a drill, systematic changes to the edge were made. Forces and temperatures on the cutting edge were measured as well as the heat flow into the chips and the workpiece. Using a quick-stop device, length and type of chip for the different drills under various machining parameters were observed. It could be shown that the modification of the transition from the chisel to the cutting edge influences the stress developed, heat in chip and chip formation. Machining with a rounded cutting edge shape compared to a sharp edge reduces the mechanical load but slightly increases thermal tool load. The presented experimental and FEA method show the possibility of determining influences of modified cutting edge shapes and to adapt the drill to the needs of the drilling process. The cutting force and stress developed during drilling processes has direct influence on the generation of heat, tool wear, quality of machined surface and accuracy of workpiece. Due to complex tool geometry, cutting conditions and some unknown factors theoretical cutting force and stress calculation failed to produce accurate results. To see the behavior of drill either experimental or Finite Elemental Analysis can be used. By using both the methods validation of results can be possible