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Method of correcting machine position change
| Details |
Inventors: Sasaki, Takao; Fujibayashi, Kentaro; Haga, Makoto;
Assignee: Fanuc Ltd. (Minamitsuru, JP)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Martin; David
Attorney, Agent or Firm: Staas & Halsey
A method of correcting a change of position of a machine tool having at least two control axes avoids abrupt machining errors. A position correction means (12) outputs correction pulses (Xcp, Ycp) so that the ratio of actual amounts of movement of the respective axes, obtained from the output values of position detectors (8X, 8Y) detecting a position of the machine tool, becomes equal to the ratio (R1) of distribution pulses (Xp1, Yp1) for the respective axes. The correction pulses (Xcp, Ycp) are added to the distribution pulses (Xp1, Yp1). Accordingly, an abrupt machining error caused at the beginning or just before the end of machining, or when machining a corner of a workpiece, is alleviated. |
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DETAILED DESCRIPTION The present invention has been made in view of the aforesaid drawbacks, and an object thereof is to provide a method of correcting a machine position change in which an abrupt machining error caused by a difference of the mechanical rigidities of machine parts in the direction of control axes can be suppressed.
To achieve the above object, the present invention provides a method of correcting a change of position of a machine tool having at least two control axes, characterized in that a correction pulse is added to a distribution pulse for individual axes, such that the ratio of actual amounts of movement of the respective axes of the machine tool, obtained from output values of a position detector for detecting a position of the machine tool, becomes equal to the ratio of the distribution pulses for the respective axes.
The actual amounts of movement along the respective axes are obtained from the output values of the position detector for detecting the position of the machine tool, and based on these movement amounts, values by which the movement has not been achieved by the distribution pulses are derived.
Therefore, when the mechanical rigidities of all of the axes are the same, the ratio of the distribution pulses for the respective axes is usually equal to the ratio of the amounts of movement of the machine tool.
Nevertheless, if an error occurs due to a difference in mechanical rigidities, the ratio of the movement amounts does not coincide with the ratio of the distribution pulses for the respective axes.
Therefore, a correction pulse is added to the distribution pulses for the respective axes so that the ratio of actual movement amounts of the respective axes of the machine tool becomes equal to the ratio of the distribution pulses for the respective axes, and the axes are controlled in accordance with the resulting output pulses.
Accordingly, an abrupt machining error which may otherwise occur at the beginning or just before the end of machining, or when machining a corner of a workpiece, can be suppressed
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I/O Systems 
