Method for automatically correcting the systematic errors in measurement and manufacturing machines and apparatus for implementing the method

摘要

A method for automatically correcting the systematic errors in measurement machines and in manufacturing machines, in particular in machine tools, characterized by comprising the following operative steps in succession: identifying the parametric mathematical model of the machine, initially assigning, to the parameters of said parametric mathematical model, numerical values considered to be close to the effective values, to obtain a provisional mathematical model of the machine, effecting a plurality of mutually independent distance measurements within the working field of the machine, determining the differences between the experimentally measured distance values and the corresponding distance values deduced from said provisional mathematical model, to define the corresponding provisional inaccuracy index of the machine, varying said parameters in the sense of improving the predefined provisional inaccuracy index, to hence obtain a new provisional mathematical model of the machine which is closer to its definitive mathematical model, proceeding iteratively with new determinations of the difference between these and the corresponding values deduced from the mathematical model until said parameter variations do not produce any further significant improvement in said inaccuracy index, to hence obtain the definitive mathematical model of the machine, obtaining from said mathematical model the position and possibly orientation errors of the final machine member, and utilizing the error data to execute the correction.