The importance of micromachining using small diameter end mills and the dies used for them has been increasing in the machining of small parts. However, the reality is that there are various requirements to improve the machining surface, machining accuracy, machining efficiency, and tool life. Therefore, this paper discusses the possibility of satisfying these requirements by high-speed up cut milling in side cutting. The goal of this study was to solve the aforementioned problems, by conducting a detailed analysis of the machining phenomena in order to understand their mechanisms. In particular, the effects of high-speed cutting using a high-speed air-turbine spindle with highly stiff rolling bearings were analyzed. Moreover, cutting experiments were conducted by measuring the cutting force and flank wear of the tool, to reveal the differences in the cutting phenomena relative to the cutting direction in high-speed micro end milling. Description of the machined surface and the measurement of its profile were also included in the discussions. On the basis of the results, high-speed up cut milling is a better choice than down cut milling; furthermore, a high-feed rate further increases machining efficiency and improves tool life.
The mioro − scale grooves are machined on the glass plates iwth the inclmed bal1 end mills . Thls study discusses the effect of the tool shape on br 虻tie fracture to improve the matenal removal rate A 至 arge edge roundness , which can be controlled by honlng, supPresses the Gra じk propagation . Horvever , the effbot Qfthe ¢ dge roundness reduces with the cutting Iength , and dlsappears 洫 the long cutnllg length due to thc tool wear Ihe ef 艶 ct of the tool stlf 正 hess on bnttle fracture ls also studled ln the vibrat 正 on tests and the cuttlng tests w 孟 th cha 皿 gmg the un − der− neck length The maXimum t ' eed rate tbr tim ' shing a erack − 〔 ree surf 』ce increases 冊 th thc tool stlffness
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