座標測定による平面輪郭の形状偏差評価法に関する研究
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概要
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In this paper the authors propose a practical approach to the form deviation evaluation of general planar contours based on coordinate measurement data. Using this approach, a complex planar contour is divided into some straight linear and curve parts, and every curve part is expressed in terms of its optimal interpolation circular arc segments whore interpolation accuracy can be specified arbitrarily. Therefore, a complex planar contour can be approximately represented by the combination of a group of straight linear segments and a group of circular arc segments. The form deviation of a measurement point is defined as the distance from the point to its corresponding linear or circular arc segment. The geometrical form deviation of the contour profile is evaluated using the least squares or the minimum zone method. The difference between the both deviations on measurement point, relative to the original contour or relative to the approximate contour, is not larger than the pre-specified value for circular interpolation accuracy, i.e. the evaluation precision of the form deviation can be sufficiently guaranteed. An actual evaluation example for a planar cam contour are shown. Its result confirms the effectiveness of the proposed approach. In addition, a technical point to obtain a rational result is presented for the case of using the least squares method to evaluate the contour form deviation based on the coordinate data of measurement points with non-uniform interval.
- 一般社団法人日本機械学会の論文
- 1999-01-25
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