著者

大岩 孝彰 太田 匠 大久保 聡

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.65, no.4, pp.537-541, 1999-04-05 (Released:2009-04-10)

参考文献数

7

被引用文献数

2 2

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The purpose of this study is to improve the stiffness of the bolted joint by means of uniforming the contact pressure distribution. Two plane surfaces of the conventional bolted joint have produced ununiformity of the contact pressure distribution and have caused decrease of the stiffness. In this paper, shape modification of bolted surfaces was performed in simulation by the finite element method and in experiments so that the pressure distribution is uniform. Moreover, grinding simulation by the finite element method estimated optimum grinding conditions for adopting a unique method to modify the surface. The measurements of the contact pressure between the modified plate and the plane base were performed and showed considerable decrease of the maximum pressure.

著者

大岩 孝彰 片岡 頼洋

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.69, no.2, pp.222-226, 2003-02-05

参考文献数

11

被引用文献数

9 7

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This study has proposed a new coordinate measuring machine (CMM) based on a three degree-of-freedom parallel mechanism. This paper describes a kinematic calibration method using a double ball bar (DBB) system with fixed ball distance. The CMM with a touch trigger probe measures the moving ball of the DBB, and calculates position errors of the ball using kinematic parameters. The least square method using Jacobian matrix corrects gradually the kinematic parameters so that the position errors are minimized. The above calculations have been repeated in both numerical simulations and experiments. The position error approaches a zero level, but has never reached it. The calibration with 19 parameters decreased the position errors of the DBB from 168 μm to 9 μm in the experiments. Furthermore, accuracies of both length measurement with block gauges and profile measurement with an optical flat have been improved after the calibration. The measurement accuracy most improves when the repetitive operation is discontinued after three or five calculations.