著者

横内 弘宇 星 光一

出版者

北海道大学

雑誌

北海道大學工學部研究報告 (ISSN:0385602X)

巻号頁・発行日

vol.52, pp.19-30, 1969-03-20

著者

菊地 千之 臼井 英治 星 光一

出版者

公益社団法人 精密工学会

雑誌

精密機械 (ISSN:03743543)

巻号頁・発行日

vol.30, no.351, pp.316-324, 1964

---

Based upon the slip line theory applied to machining with cut-away tools proposed in the previous papers, the cutting force equilibrium through the plastic field is analyzed.<BR>Cutting forces and chip formation in machining with various types of cut-away tool are compared with the conventional tool. Tools having restricted double rake face are discussed in view of cutting forces, chip formation and slip line construction of the plastic field produced.

著者

星 光一 小林 雅晴

出版者

旭川工業高等専門学校

雑誌

旭川工業高等専門学校研究報文 (ISSN:03899306)

巻号頁・発行日

no.10, pp.29-39, 1973-03

著者

小林 雅晴 星 光一

出版者

旭川工業高等専門学校

雑誌

旭川工業高等専門学校研究報文 (ISSN:03899306)

巻号頁・発行日

no.16, pp.p53-62, 1979-03

著者

五十嵐 悟 斎藤 勝政 星 光一

出版者

北海道大学

雑誌

北海道大学工学部研究報告 (ISSN:0385602X)

巻号頁・発行日

no.52, pp.1-18, 1969-03

著者

星 光一 臼井 英治

出版者

公益社団法人 精密工学会

雑誌

精密機械 (ISSN:03743543)

巻号頁・発行日

vol.34, no.397, pp.113-120, 1968

被引用文献数

1

---

Wear characteristics and tool-life curves in machining of low and medium carbon steels with various types of cut-away tools made of carbide and high speed steel are described and compared with those for conventional tools.<BR>Although an artificial reduction of natural tool-chip contact length usually reduces both crater and flank wear, there always exists optimum value of contact length below which tool-life is shortened. The optimum length depends on side rake angle of the tool and is found that the smaller the rake angle, the shorter the length becomes.<BR>In comparison of tool wear at the optimum contact length, it is found that flank wear is somewhat increased, but crater is substantially reduced as the rake angle is decreased.<BR>Tools with sufficiently reduced contact length show a special type of crater which is not formed on the first rake face, but mainly develops along the second rake face. This characteristic is well explained by the theory of cutting mechanism presented in the previous papers.<BR>Not only cutting temperature but also shape of cutting edge has a great importance on tool wear even in high speed machining. The wear mechanism appears to be explained as a stressdependent rate process.

著者

五十嵐 悟 斎藤 勝政 星 光一

出版者

北海道大学

雑誌

北海道大學工學部研究報告 (ISSN:0385602X)

巻号頁・発行日

vol.52, pp.1-18, 1969-03-20

著者

横内 弘宇 星 光一

出版者

北海道大学

雑誌

北海道大学工学部研究報告 (ISSN:0385602X)

巻号頁・発行日

no.52, pp.19-30, 1969-03

著者

三宮 泰治 星 光一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集 (ISSN:00290270)

巻号頁・発行日

vol.5, no.18, pp.216-221, 1939

---

従耒の調帯掛け普通平削盤とワードレオナルド方式高速平削盤との比較切削試験を試み、理論的立場といふよりは寧ろ現場的立場に重点を置き、工場に於て実際に使用し得るに便利な簡易なる切削力測定器を作り、それに依て両者の特異性を明らかにせんとしたものである。この目的のために普通平削盤にはシンシナチ製 20ft ベルト掛け平削盤、高速平削盤にはニイガタ 5D型標準高速平削盤を使用し、同一なる材質、形状及び大きさを有する被切削材を、各機に適應した実用的の切削条件の下に於て比較切削試験を行つたものである。

著者

岸浪 建史 秋山 俊彦 星 光一

出版者

公益社団法人 精密工学会

雑誌

精密機械 (ISSN:03743543)

巻号頁・発行日

vol.37, no.441, pp.701-707, 1971

被引用文献数

1

---

This paper describes the effects of the artificially controlled shear angle on the metal cutting process. From the experiments in which commercially pure lead is cut with various controlled shear angles, constant cutting speed, and depth, and various rake angles, the following results were obtained.<BR>(1) Taking rake angle (&alpha;) as parameter and increasing the controlled shear angle (&phi;), the points (&phi;, &beta;-&alpha;) move along a right convex curve on the &phi; vs &beta;-&alpha; plane on which critical points giving a minimum value of cutting force (<I>F<SUB>c</SUB></I>, min), lie in the vicinity of Merchant's Line.<BR>(2) The variation of &phi; does not influence the friction force on the rake face (CF), and the angle which gives a minimum cutting force (<I>F<SUB>c</SUB></I> min) gives a maximum value of coefficient of friction on the rake face.<BR>(3) Hydrostatic pressure on the shear plane increases with the increase of &phi;, and does not influence the shear stress on it.<BR>(4) It has been confirmed either the shear plane model does not agree with the cutting mechanics for low cutting speed or the angle &phi; is such that the total cutting power is not minimum.

著者

嘉数 侑昇 沖野 教郎 星 光一

出版者

公益社団法人 精密工学会

雑誌

精密機械 (ISSN:03743543)

巻号頁・発行日

vol.38, no.448, pp.436-442, 1972

---

Due to the increasing popularity of Numerical Controlled Machine Tool Systems, the development of the higher level soft wares in this field becomes necessary. Further more, direct connection between Computer-Aided Design (CAD) and Computer-Aided Manufacturing brings about a problem.<BR>In order to cope with these situations, this paper proposes a new method on the automatic programming for NC considering the connection of both systems.<BR>After description of the workpiece profile by &ldquo;Formulated Pattern&rdquo; in the process of CAD, this method makes it possible to generate automatically NC commands for the tool path.<BR>The basic idea of this method is to establish the penalty surface arround the workpiece profile as a guide for determining the tool path.<BR>Since, using &ldquo;Formulated Pattern&rdquo;, the penalty can be given such as having minimum value on the cutting point, the problem for finding tool path is reduced to that for seeking minimum on the penalty surface.<BR>In this paper a theoretical development of this principle and practical algorithm for the determination of tool path are described with two examples, NC milling of NASA Airfoil pat-tern and plate cam designed by CAD procedure. Then, a method for collision check using same principle is described too.

著者

星 光一 秋山 俊彦

出版者

旭川工業高等専門学校

雑誌

旭川工業高等専門学校研究報文 (ISSN:03899306)

巻号頁・発行日

no.16, pp.p1-15, 1979-03

著者

臼井 英治 星 光一

出版者

公益社団法人 精密工学会

雑誌

精密機械 (ISSN:03743543)

巻号頁・発行日

vol.30, no.350, pp.273-284, 1964

被引用文献数

4

---

In the previous papers, it was reported that the plastic flow ahead of the restricted tool-chip contact length of cut-away tools is produced through a slip-line field which involves a centered fan.<BR>The plastic flow peculiar to the tools bears a great resemblance to the curved layer structure of built-up edge and the plastic flow within the chip ahead of the built-up edge nose, which are usually observed on etched specimen under microscope. In addition, the plastic flow itself turns to the stable built-up edge under some conditions.<BR>This paper stresses the importance of the plastic flow due to the centered fan of slip lines for more rational understandings of the nature of built-up edge. In this connection, the formation and the growth of the natural built-up edge as well as the built-up edge produced by cut-away tools are critically re-examined.