Improvements in and relating to machine tools

Details Improvements in and relating to machine tools Improvements in and relating to machine tools

G - Physics

05

B

G05B 19/18 (2006.01)

Patent

CA 2221156

In a machine tool, a component such as a grinding wheel acts on a workpiece to form the latter into a circularly asymmetric shape, for example, a crankpin. Movement of the grinding wheel is controlled by a control signal which is derived from theoretical relative positions and positional velocities of the grinding wheel relative to the workpiece. In the course of at least one revolution of the workpiece, the respective positions of the grinding wheel relative to the workpiece are measured for each of a succession of angular positions of the workpiece. The measured positions are compared with corresponding theoretical positions and data indicative of any differences are stored, and then used to modify the control signal during a subsequent revolution of the workpiece so as to compensate for any of said differences and thereby reduce the magnitude of any error which would have resulted from the measured positional differences.

Dans une machine-outil, un élément tel qu'une meule agit sur une pièce à usiner pour lui conférer une forme circulaire asymétrique, par exemple, un tourillon de manivelle. Le mouvement de la meule est commandé par un signal de commande qui est dérivé des positions relatives théoriques et des vitesses de position de la meule par rapport à la pièce à usiner. Pendant au moins une révolution de la pièce à usiner, les positions correspondantes de la meule par rapport à la pièce à usiner sont mesurées pour chacune des positions angulaires successives de la pièce. Les positions mesurées sont comparées à des positions théoriques correspondantes et des données indiquant toute différence éventuelle sont mémorisées et ensuite utilisées pour modifier le signal de commande pendant une autre révolution de la pièce. Cela permet de compenser la différence éventuelle et de réduire en conséquence l'ampleur de l'erreur due aux différences des positions mesurées.

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