Investigation of Cutting Characteristics of Micromilling and Development of Ultrasonic Micromilling System

：在注塑模具、几个汽车零部件和移动信息设备的制造中，要求使用微型端面铣刀具有高的切割性能。在本研究中，作者研究了微细粉碎的切割特性，并开发了一套超声微细粉碎系统。在此基础上，明确了直径为30μ和10μm的微型立铣刀在微细铣削加工中的加工精度与主轴动平衡的关系，并提出了在微细铣削加工中获得有效加工精度的动态平衡条件。在后一项研究中，作者新开发了一种超声波主轴系统，主轴以20000min-1的速度旋转，以41 kHz的频率和2μm的振幅振动，进行了移动信息终端的草的单次划痕试验和CBN立铣刀对淬硬钢的微细铣削试验。阐明了该超声微细粉碎系统有利于注塑模具及多个零件的制造。

：High cutting performance using micro-end mills has been demanded in the manufacture of injection molds, several automotive parts and mobile information equipment. In this study, the author investigated cutting characteristics of micromilling and developed an ultrasonic micromilling system. As a result of the former study, it was clarified that the relationship between cutting accuracy and dynamic balance of main spindle in micro-milling operation using micro-end mills with diameters of 30μｍand 10μm. Then, the author proposed the dynamic balance condition to obtain effective cutting accuracy in the micromilling. On the latter study, the author newly developed an ultrasonic spindle system, which has the main spindle rotated with a speed of 20,000min-1 and vibrated with a frequency of 41kHz and an amplitude of 2μm. Several cutting tests were experimented, such as single scratch tests of grass for the mobile information terminal and micromilling of hardened steel by using cBN end mills. Then, the author clarified that this ultrasonic micromilling system is advantaged to the manufacture offine injection mold and several parts.