METHOD FOR GRINDING WORKPIECES, IN PARTICULAR FOR CENTERING GRINDING OF WORKPIECES SUCH AS OPTICAL LENSES

摘要

The invention relates to a method for centering grinding of workpieces, for example optical lenses by a grinding tool using an actuator for generating an advancing movement between the grinding tool and the workpiece, wherein the actuator and a current regulator for an actuator current which determines an advancing force of the actuator are integrated in a position control loop using a predetermined control cycle. For each control cycle: (i) a desired direction of movement (Rsoll(n)) of the advancing movement and an actual direction of movement (Rist(n)) of the advancing movement are ascertained; then (ii) the ascertained actual and desired directions of movement are compared to one another; and (iii) when the comparison results in a deviation between the actual and desired directions of movement, a predetermined current limit (Isollmax) for the actuator current emitted via the current regulator is decreased in a defined manner.

主权项

1. A method of grinding a workpiece, by a grinding tool with use of an actuator for producing a relative advancing movement between said grinding tool and said workpiece, wherein the actuator together with a controller for an actuator current, which determines an advance force of the actuator, is integrated in a position control circuit which is run through with a predetermined control cycle, wherein for each control cycle:
(i) a target movement direction (Rsoll(n)=−1, 0 or 1) of the advancing movement as well as an actual movement direction (Rist(n)=−1, 0 or 1) of the advancing movement are determined; (ii) the determined actual movement direction (Rist(n)) of the advancing movement is then compared with the determined target movement direction (Rsoll(n)) of the advancing movement; and (iii) if the comparison gives a difference between the actual movement direction (Rist(n)) of the advancing movement and the target movement direction (Rsoll(n)) of the advancing movement a predetermined current limit (Isollmax) for the actuator current (I(n)) delivered by way of the current controller is subject to defined reduction in order to reduce the advance force of the actuator.