Analysis of Flatness Measurement and Form Stability of a Granite Surface Plate

作     者：de Bruin, W. Meijer, J. van Hasselt, R. 

作者机构：Twente University of Technology Enschede Netherlands 

出 版 物：《CIRP Annals - Manufacturing Technology》 (CIRP Ann Manuf Technol)

年 卷 期：1980年第29卷第1期

页      面：385-390页

学科分类：0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0811[工学-控制科学与工程] 0801[工学-力学（可授工学、理学学位）] 

摘      要：It is rather difficult to compare quantitatively flatness measuring results of one and the same object (e.g. in case of a long-term stability investigation) or the results of a series of products (e.g. from the same machinetool in order to indicate machinetool-influences). An extension of a computerprogram applied to the evaluation of flatness measurement (as described in the CIRP-Annals, vol. 26 (1977), no.1), separates the form deviations of a surface into a geometrical part and a random part. The geometric part consists of a best-fitting non-flat, reference plane, composed of the single curvature of a sphere and the double curvature of a real twisted plane. Three parameters (the dimensionless curvature parameters of sphericity and torsion, together with the direction of the torsionvector) are able to characterize the geometrical part of the surface;a fourth one is a measure for the random part. Advantages of the method are demonstrated with the aid of a long-term investigation into the form stability of a granite surface plate. Another extension of the program makes it now possible to measure surfaces with non-rectangular contours in the same way as it is being done in case of a rectangular surface plate. © 1980 CIRP.