著者

山口 哲郎 仙波 卓弥

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.73, no.732, pp.2394-2400, 2007-08-25 (Released:2011-03-04)

参考文献数

10

被引用文献数

2 2

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A high-speed microfabrication technique using a focused laser beam was developed. A conventional CAD/CAM system was used, and the beam was scanned mechanically by attaching both optical mirror arrays and a focal lens to the column of an ultraprecision machining center. The measured groove width and pocket depth obtained by grooving and pocket machining were used as the tool diameter and the axial depth of cut, respectively. Glasslike carbon with a laser beam absorptivity of over 80% and a hardness of 650 MHv was employed as a workpiece. It was verified through a machining test that pseudo-3-dimensional concave prisms can be fabricated by digging square pockets with different square sizes but the same pocket depth in the negative Z direction. Shifting the laser's focal point away from the work surface can decrease the depth of the square pocket, so that high-speed roughing by adjusting the focal point on to the work surface and highspeed finishing by shifting the focal point away from the work surface can be conducted.

著者

仙波 卓弥 天本 祥文 角谷 均

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.16-00573-16-00573, 2017 (Released:2017-07-25)

参考文献数

9

被引用文献数

2

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A linear machining technique using a nanosecond pulsed laser, adaptable for forming a single-point cutting tool made of nano-polycrystalline diamond, was developed. A basic study to find the principal rules of linear machining was conducted by forming an inclined face against the beam axis that is coincided with the Z axis. The face was formed by conducting repeatedly a set of machining processes, comprising linear machining to remove chips and zero-cut machining to remove the residual stock. It was verified through a machining test that the removal depth in the Z direction was independent of the inclined angle of the face. In addition, the stock removal in the Z direction coincided with the sum of the applied depths of cut in the Z direction when the residual stock removal in each machining step was eliminated by the zero-cut machining. These basic rules made it possible to accurately fabricate a convex dimple with a diameter of 0.2 mm, during which the inclined angle of the machined face against the beam axis varied at every position, by repeatedly conducting the set of machining processes. Also, it was verified through the forming test of a single-point cutting tool with a nose radius of 0.4 mm that the linear machining technique enabled the fabrication of the tool with a shape accuracy better than 1 μm and a cutting edge radius of less than 250 nm.

著者

仙波 卓弥

出版者

東京大学生産技術研究所

雑誌

生産研究 (ISSN:0037105X)

巻号頁・発行日

vol.37, no.11, pp.461-468, 1985-11-01

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特集 生産・加エシステムの最適化