Tool compensation system
First Claim
1. In a tool compensation system of the type which includes a command value register for storing a movement command value, a compensation value register for storing a tool compensation value, and means for shifting a tool from a position represented by the movement command value to a position spaced apart therefrom a distance corresponding to the tool compensation value, the improvement comprising:
- first means for counting the amount of use of the tool; and
second means responsive to said first means for correcting the content of the tool compensation value register by a preset value each time the count value of the first means has reached a predetermined value.
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Abstract
When machining with a numerical-controlled machine tool, both a command value providing the configuration of a finished product and a compensation value depending on the tool are needed, and tool compensation data must be corrected in response to tool wear. The present invention, taking notice of the fact that correction data corresponding to tool wear can be predetermined from the frequency or time of tool use and the fact that the amount of tool wear can be unequivocally determined by the quality of materials of the tool and work, provides circuitry for counting the frequency or time of use of the tool and circuitry for correcting by a predetermined value the content of a compensation value register having tool compensation date when the number of times a tool has been used or when the duration of tool use has reached a predetermined value.
23 Citations
11 Claims
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1. In a tool compensation system of the type which includes a command value register for storing a movement command value, a compensation value register for storing a tool compensation value, and means for shifting a tool from a position represented by the movement command value to a position spaced apart therefrom a distance corresponding to the tool compensation value, the improvement comprising:
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first means for counting the amount of use of the tool; and second means responsive to said first means for correcting the content of the tool compensation value register by a preset value each time the count value of the first means has reached a predetermined value. - View Dependent Claims (2, 3, 4, 5)
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6. A tool compensation system for use with a numerical-controlled machine which machines a workpiece using a plurality of tools having predetermined wear rates, comprising:
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first means for selectively moving the tools into cutting position against the workpiece; second means for storing a tool movement command corresponding to a predetermined cutting movement of the selected tool; third means for storing tool compensation values of each of the plurality of tools; fourth means for storing tool wear rate data for each of the plurality of tools; fifth means for storing tool usage data for each of the plurality of tools; sixth means for using the tool wear rate data stored in the fourth means and the tool usage data stored in the fifth means to correct the corresponding tool compensation value stored in the third means every time the corresponding tool has had a predetermined amount of usage; and seventh means responsive to the second and sixth means for combining the tool movement command and the tool compensation value of the selected tool to obtain a compensated tool movement command value for moving the selected tool. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification