Wear Characteristics And Process Planning Method Of Cutter Tool In High Speed Milling Hardened Steel

In high speed milling hardened steel mold with large size and complex structure, drastic wear of tool has direct influence on quality of machined surface and tool life, and sometimes cause the security problems of the tool which restricts the processing efficiency. The existing evaluation of tool wear and the calculation methods of tool life are obtained the characteristics of tool wear changing with the cutting stroke through the cutting experiment, rather than the quantitative analysis and calculation of tool wear. The existing of design methods of high speed machining hardened steel did not take into consideration the influence of the varied characteristics of the workpiece on tool wear and tool life. It is also necessary to research that, under impulsive load, the tool life and design scheme of machining process can not meet machining requirements of large structure size and complex surface in high speed milling and high precision cutting.This thesis which obtained the support of the National Natural Science Foundation of China "high energy efficiency milling cutter wave mechanics mechanism of injury multiscale collaborative design method(51375124)", researched friction and wear model of high speed cutter in milling hardened steel, and revealed characteristics of wear, and puts forward methods of performance test and process planning in high speed milling hardened steel.Basis the model of sliding friction of high speed ball-end mill cutter, researched distribution characteristic of contact stress on hardened steel surface between front and rear flank and cutting edge. Wear model of cutter based on principle of frictional work is established, and gave algorithm of wear loss of cutter rear flank.The effect of tool-workpiece contact stress and relative sliding ratio on wear of cutter is analyzed. Combined with the wear experiment of high speed milling hardened steel, acquired influencing characteristic of milling mode, machining inclination angle and vibration on the wear of high speed ball-end milling cutter. Using the impact wear experiment of front and rear face, researched wear characteristic of cutter in different conditions.To replace the large surface hardened steel mold, concave and convex surface of hardened steel mold test-piece with multi- hardness are designed, and performance of the high speed milling cutter wass tested. The vibration performance of wear of milling cutter on cutting hardened steel was analyzed, and put forward the optimization method of high speed milling hardened steel process to solve fuzziness and uncertainty problems of performance evaluation.In order to solve the problem of cutter wear in high speed milling hardened steel, established evaluation model about tool life multiply cutting efficiency, revealed the influence of interaction of machining efficiency and cutter life effect on high speed milling process, and put forward the process design method to control cutter consumption when high speed milling hardened steel and improve tool life multiply cutting efficiency based on security of milling cutter. This method realized high efficiency and long cutters life during high speed milling hardened steel process in the framework of cutter security and stable cutting.