著者

臼井 英治 白樫 高洋 北川 武揚

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.41, no.491, pp.1141-1146, 1975-12-05 (Released:2009-06-30)

参考文献数

8

被引用文献数

1 1

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The paper proposes an analytical method which enables to predict the temperature distribution in three dimensional metal cutting with single point tool, based only upon orthogonal cutting data. By using the three dimensional cutting model and the energy method presented in the previous paper, it is possible to obtain cutting force and chip formation such as chip flow direction, shear angle and chip shape for the tool of arbitrary shape. An assumption made on the frictional stress distribution on rake face together with the results through the energy method determines the strength of heat sources in the cutting model. The temperature distribution in workpiece, chip and tool is thus obtained through a numerical analysis of the equation involving heat conduction, transfer and generation. The predicted distribution of the temperature on rake face is found to be in good agreement with the distribution measured with a fine, insulated platinum wire embedded in the tool, of which end is exposed on the rake face and makes a thermo-couple with the chip produced.

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

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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 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

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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

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

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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.

著者

臼井 英治 松本 英樹 松村 隆

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.66, no.12, pp.1968-1973, 2000-12-05 (Released:2009-04-10)

参考文献数

12

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The paper presents a structure model with single degree of freedom which may represent the non-linear characteristics of actual machine tool structure. By using an experimental set-up for orthogonal turning which utilizes the proposed structure model, it is shown that the non-linear variations of vibration parameters m, k, c with applied load can be measured with a special impulsive excitation technigic during the actual turning. Th obtained variations are proved to be quite similar to those obtained for usual turning lathe. Computer simulations of chatter on-set process are then carried out with taking both the variable m, k, c obtained and the non-linearity of cutting process reported in the previous papers into account. The predicted stability thresholds of chatter vibration through the simulation are in good quantitative agreement with the experimental results which include the well-known non-linear phenomena such as high feed and high speed stabilities of chatter and the finite amplitude chatter vibration.

著者

白樫 高洋 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.39, no.464, pp.966-972, 1973-09-05

被引用文献数

32