Gear cutting – milling – or planing – Milling – With regulation of operation by templet – card – or other...
Patent
1992-12-17
1994-08-02
Briggs, William
Gear cutting, milling, or planing
Milling
With regulation of operation by templet, card, or other...
318578, 36447403, B23Q 3514, G05B 100
Patent
active
053339746
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a tracer control unit, more particularly a tracer control unit that controls a tracer head to trace a model preceding a cutter.
BACKGROUND ART
A conventional tracer control unit has carried out a tracer control subject so that the axes of a cutter of a copy machine tool are mechanically coupled to a tracer head. More specifically, the tracer control unit detects the amount of deflection of all axes of a stylus by the tracer head and the command values for the axes are calculated using these amounts of deflections in a trace computing circuit. Then with these command values, the cutter is relatively moved to a workpiece by driving the motors for the axes while the tracer head is moved at the same speed along a surface of a model. The tracer control for machining a workpiece in the same shape as the profile of the model is carried out by repeating the above operations.
In the case that a tool such as, for example, a cutter and a workpiece are to be moved in accordance with the tracer command values generated by the conventional tracer control unit, the tracer head and the tool are simultaneously driven with the feed axis drive commands thus generated and the tracer control unit has not been provided with a function for moving the tracer preceding movement of the cutter axis.
However, when the stylus provided on the tip of the tracer head collides with a corner or a similar part of the model during the tracing of the model, the tracer head bites the model for a moment, because the tracer head travels excessively because of effects such as the delay of the servo system that forms the driver of the tracer head and the inertia of the machine.
Consequently, the cutter also bites the workpiece as much as that of the tracer head and the machining accuracy at the corner of the model deteriorates. Accordingly, the conventional tracer control unit has a problem in that a part of the model where the profile is abruptly changed cannot be accurately traced.
DISCLOSURE OF THE INVENTION
An object of the present invention, which is made in consideration of the points described above, is to provide a highly accurate tracer control unit capable of delaying a tool for a certain specified time from the tracer head and tracing the model with the tracer head along the same path so that the cutter does not bite a workpiece.
The present invention provides a tracer control unit that allows a workpiece to be machined in the same shape as a model by driving a tool so that the tool moves along a trace of the stylus that is driven while maintaining contact with the model, comprising a plurality of first axis control means for driving the stylus, a plurality of second axis control means for driving the tool, control signal generating means for generating a plurality of control signals to be respectively supplied to the first axis control means so that the stylus is driven while maintaining contact with the model, and delay means for delaying the control signals generated by the control signal generating means for the specified time and supplying the delayed control signals to the second axis control means.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the general configuration of the tracer control unit and the copying machine tool in accordance with the present invention;
FIG. 2 is a block diagram showing the main control elements of the tracer control unit in accordance with the present invention; and
FIG. 3 is a block diagram showing a corner part of a model for copy machining.
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing the general configuration of the tracer control unit and the copy machine tool in accordance with the present invention. In FIG. 1, the tracer control unit 20 has a CPU 11 for executing various operations such as trace computing, ROM 12 and RAM 13 for storing control programs and a non-volatile memory 14. The non-volatile memory 14 is backed up by a battery not shown and stores the parameters related to t
REFERENCES:
patent: 4658127 (1987-04-01), Ferrari
patent: 4702652 (1987-10-01), Rokksku et al.
patent: 4746251 (1988-05-01), Yoshikawa et al.
patent: 5121041 (1992-06-01), Matsuura et al.
patent: 5180957 (1993-01-01), Matsuura et al.
Patent Abstracts of Japan, vol. 9, No. 162 (M-394)(1885), Jul. 1985, & JP-A-60 34 253, Feb. 21, 1985.
Patent Abstracts of Japan, vol. 8, No. 249 (M-338)(1686), Nov. 15, 1984 & JP-A-59 124 552, Jul. 18, 1984.
Briggs William
Fanuc Ltd.
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