Gear cutting – milling – or planing – Milling – With regulation of operation by templet – card – or other...
Patent
1982-12-01
1985-08-13
Briggs, William R.
Gear cutting, milling, or planing
Milling
With regulation of operation by templet, card, or other...
318578, 364474, 409 80, 409 98, B23Q 3514, H02P 706, G06F 1546
Patent
active
045346852
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tracer control system which improves the cutting accuracy and the cutting speed of tracing in an arbitrary direction using a combination tracer control-numerical control unit capable of cutting a workpiece by either tracer control or numerical control.
In the case where arbitrary-direction tracing, which permits feed at an arbitrary angle to the X- or Y-axis, is carried out through the use of a combination tracer control-numerical control unit, it is conventional in the prior art to cut a workpiece with a cutter while controlling the X-axis and the Y-axis by numerical control and the Z-axis by tracer control. That is to say, the prior art employs one-axis tracing, and hence possesses defects such that sufficient cutting accuracy cannot be obtained, and the cutting speed cannot be increased.
SUMMARY OF THE INVENTION
The present invention overcomes the above-described defects and has an object of providing increased cutting accuracy and cutting speed in arbitrary-direction tracing using a combination tracer control-numerical control unit.
A system according to the present invention includes a tracer control-numerical control unit which combines tracer control and numerical control. A signal generating device, such as a controller, provides a numerical control function by generating a signal representing the angle of a feed shaft according to numerical information, indicating a path of cutting. Signals for tracer control are generated by first and second coordinate transformation circuits. The first coordinate transformation circuit generates a displacement component signal in the direction of the feed shaft. The second transformation circuit, in accordance with the signal generating device, distributes signals controlling the direction and feed rates of the feed shaft.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an apparatus embodying the system of the present invention;
FIG. 2 is a vector diagram of the relationships of respective signals; and
FIGS. 3 and 4 are diagrams of paths of movement controlled by the system of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the present invention will hereinafter be described in detail.
FIG. 1 is a block diagram of a tracer control-numerical control unit embodying the system of the present invention. Reference numeral 1 is a tracer head, 2 a stylus, 3 a displacement calculation circuit, 4 a subtracter, 11 and 12 adders, 5 and 6 velocity calculation circuits, 7 a distribution circuit, 8 and 10 coordinate transformation circuits and 9 a displacement-direction indexing circuit. Reference numeral 13X, 13Y and 13Z are servo amplifiers, 14X, 14Y and 14Z motors, 15X and 15Y position detectors, 16 and 17 registers, 18 a controller, 19 a memory, 20 a tape reader, 21 a command tape, 22 an AD converter, 23 and 24 DA converters, and 25 and 26 simulators.
Three differential transformers (not shown) corresponding to the X-, Y- and Z-axes, provided in the tracer head 1, are excited by an alternating current of a frequency f and, when the displacement vector .epsilon. of the stylus 2 contacting a model (not shown) is such as shown in FIG. 2 (letting 2.pi.ft=.omega.) signals .epsilon..sub.x, .epsilon..sub.y and .epsilon..sub.z supplied by the tracer head 1 are output as follows:
Now, consider the case of performing tracing from the origin O to a point B (X.sub.B, Y.sub.B) along an axis A illustrated in FIG. 2. It will be assumed that the coordinates (X.sub.B, Y.sub.B) of the point B are recorded as numerical information on the command tape 21 (FIG. 1).
Based on the numerical information of the command tape 21, that is, the coordinates of the point B, read by the tape reader 20, the controller 18 conducts the computations in the following equations (4) and (5) to obtain the sine and the cosine of the angle formed between the X-axis and the A-axis. ##EQU1## The controller 18 supplies a digital signal indicating the sin .alpha. to the DA converter 23 and a digital
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English translation of the claims of Japanese Pat. Nos. 55-58954 and 55-106753.
Komiya Hidetsugu
Yamazaki Etsuo
Briggs William R.
Fanuc Ltd.
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