著者

城 道介 鳥原 冬輝

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.54, no.7, pp.1272-1278, 1988-07-05 (Released:2009-10-08)

参考文献数

6

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A new definition of degrees of freedom of mechanisms is presented in terms of pair-loop matrices derived from pair-axis-motors and circuit matrices. A motor or a set of screw coordinates is an extended form of a vector by which instantaneous motion of a rigid body can be represented completely and uniquely. Superpositions of velocities correspond to summations of motors. The definition is valid for mechanisms with multiple closed loops and with critical forms such as pantograph. Pair-loop matrices have enough information of constraints of mechanisms to set up loop equations which determine magnitude ratios of relative velocities on all pairs. An algorithm based on pair loop equations is presented in order to simulate motion of mechanisms. Output examples of simulation program coded in APL show the effectiveness and conciseness of this algorithm.

著者

城 道介 鳥居塚 卓 大島 俊哉

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.55, no.5, pp.883-889, 1989-05-05

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Eleven operations on a set of two-dimensional domains are defined to grasp and handle clearly the varied types of collision problems in process planning of NC-lathe operations. One of the most essential concepts for the solution of dynamic collision problems is "Interference Domain" determined by a wonk-contour and a tool-contour. When the tip of the tool is located in the interference domain, the tool must collide against the workpiece. Using inversion and envelope operations, an algorithm named "Inversed Template Method" is presented to compute an interference contour easily from complicated contours of work and tool. A computer program is coded as a set of subroutines executing the operations by which several typical collision problems in lathe operations are solved to show the effectiveness of the domain operations.

著者

城 道介 前田 純一郎 武田 健二 吉川 弘之 佐田 登志夫

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.444, pp.38-46, 1972-01-05 (Released:2009-06-30)

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A method of processing geometrical patterns is proposed, which facilitates the develop-ment of automatic manufacturing system. The patterns described in a conventional form such as drawings of machine parts, are transformed into some process-oriented form, where the pattern is segmented into elements, codes of which carry all necessary information together with the connecting relationship among these elements. This method is applied to construct a fully automatic programming system for NC-lathe, where the necessary input data is only the shape of part and blank, and every necessary information is available as output of the system. This is called STORK 2 SYSTEM. Some practical applications of this system to turning processes proved its remarkable advantages such as the simplest input form, small core size and short computing time.