Boots – shoes – and leggings
Patent
1992-05-12
1994-05-31
Ruggiero, Joseph
Boots, shoes, and leggings
36447412, 36447417, 36447422, G06F 1546, G05B 19405
Patent
active
053175182
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of plotting a loaded condition under a machining operation, and more particularly, is directed to a loaded condition plotting method capable of simultaneously displaying a motor load current value and a point being machined during the machining operation.
BACKGROUND ART
In the known prior art, during the cutting operation using a motor controllable by a numerical control system as the drive source, a load current flowing through the motor is displayed in the form of a bar graph, or alternatively the fluctuation waveform of the motor load current with a lapse of time is displayed in a graph so that the operator can grasp the cutting state. When the motor load current is displayed in a bar graph, the operator reads a point being machined from the abscissa of the graph while reading a motor load current value shown in the ordinate of the graph, to verify the motor load current values at various machined points, thereby grasping the cutting state. Also, in the case where the fluctuation waveform of the motor load current is displayed in a graph, the cutting state can be grasped based on the elapsed time (corresponding to the machined point) and the motor load current value, respectively shown along the axis of abscissas and axis of ordinates of the graph.
According to the conventional loaded condition plotting method, it is, however, difficult in that the operator must simultaneously and promptly grasp the motor load current value and the point being machined with accuracy. Due to this, even though a disorder is found in the motor load current value, the operator cannot promptly judge the machined point where such disorder has occurred.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a loaded condition plotting method in which the operator can simultaneously and promptly grasp a motor load current value and a point being machined with accuracy during a machining operation using a motor as the drive source.
In order to achieve the above object, the present invention provides a method of plotting a loaded condition in machining operation using as a drive source a motor controllable by a numerical control system executing a machining program, the method comprising the steps of:
(a) presetting a plurality of tool locus plotting techniques;
(b) determining a tool locus in accordance with the machining program during the machining operation;
(c) selecting correspondingly one of the plurality of tool locus plotting techniques with respect to each of motor load current values which have been periodically detected during the machining operation; and
(d) plotting a portion of the tool locus determined in the step (b) which corresponds to each of the detected motor load current value, onto a display screen in the tool locus plotting technique selected in the step (c).
In the step (a), preferably, the plurality of tool locus plotting techniques in the step (a) are each set correspondingly to a plurality of motor load current regions obtained by segmenting a range where the motor load current varies. The plurality of tool locus plotting techniques are different from each other in at least any one of plotting color, kind of line, and luminance. More preferably, the plurality of motor load current regions are obtained on the basis of the rated motor current. In the step (c), the motor load current to be detected is a current flowing through either of a spindle motor driving a tool or a workpiece and a servomotor driving a tool rest or a workpiece rest.
According to the present invention as described above, one of the plurality of tool locus plotting techniques which have been previously set, is correspondingly selected with respect to each of the motor load current values periodically detected during the machining operation, and then each portion of the tool locus, which has been determined in accordance with a machining program, is plotted on a display screen in the selected tool locus plotting technique. Therefore, the operato
REFERENCES:
patent: 4521860 (1985-06-01), Kanematsu et al.
patent: 4646228 (1987-02-01), Ikeda
patent: 4831542 (1989-05-01), Shima et al.
patent: 4887221 (1989-12-01), Davis et al.
patent: 5126646 (1992-06-01), Fujita et al.
Fujita Naoki
Miyamoto Kota
Fanuc Limited
Ruggiero Joseph
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