Boots – shoes – and leggings
Patent
1984-05-25
1987-08-04
Smith, Jerry
Boots, shoes, and leggings
364189, 340709, G05B 19405, B23Q 1500
Patent
active
046850643
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a machining condition setting system in a wire cut electric discharge machine having a numerical control unit.
In conventional wire cut electric discharge machines, a predetermined voltage is applied to a gap formed between a workpiece and a wire electrode extending along the longitudinal direction of the machine in order to cut the workpiece by a small amount each time. At the same time, the wire electrode is moved relative to the workpiece in accordance with instruction data so as to produce a workpiece with a predetermined shape. An electric discharge machine of this type requires specific machining conditions such as a voltage applied to the gap, a peak value and an average value of a current which flows through the gap, a capacitance of a discharge circuit, a duty cycle of a pulse applied to the gap, a tension force acting on the wire electrode, and a resistivity of a working fluid supplied to the gap, depending on the material and thickness of the workpiece and a diameter of the wire electrode. An operator who operates the wire cut electric discharge machine must preset these machining conditions at an operation panel on the numerical control unit by considering the material and thickness of the workpiece and the diameter of the wire electrode.
However, in the conventional wire cut electric discharge machine, the machining conditions are preset by a rotary switch. For this reason, rotary switches must be provided for the respective machining conditions. When the preset values of the machining conditions are updated, it is difficult to gradually update these preset values. In addition to this disadvantage, when the preset values of the machining conditions change greatly during machining, hunting occurs and the wire electrode is undesirably cut. As a result, scratches are formed on the workpiece.
SUMMARY OF THE INVENTION
It is a first object of the present invention to display various machining conditions on a CRT display unit so as to allow values of these machining conditions to be set with numerical push buttons.
It is a second object of the present invention to provide an electric discharge machining condition setting system capable of continuously updating the preset data.
It is a third object of the present invention to provide an electric discharge machining condition setting system capable of changing a data updating rate in accordance with a degree of updating when the various machining conditions are continuously updated.
In order to achieve the above objects of the present invention, various machining conditions are displayed on a screen at a CRT display unit in a wire cut electric discharge machine to allow an operator to select proper machining conditions with a cursor and preset values with machining condition push buttons. In addition to this arrangement, there are also provided increment and decrement push buttons in addition to numerical push buttons "0" to "9" to allow continuous increase/decrease of the preset values by depressing the increment/decrement push button for a given time.
According to the present invention, by changing the depression time of the increment/decrement push button, a data updating rate can be changed.
As described above, in a wire cut electric discharge machining setting system, the machining conditions can be easily preset and updated with numerical push buttons. In addition to this advantage, the preset values can be continuously changed by using the increment and decrement push buttons. As a result, hunting and wire disconnections will not occur even if the preset values are greatly changed, unlike in conventional updating using rotary switches.
When the preset values are gradually updated, the updating rate can be changed by changing the depression time of the increment/decrement push button, thereby accurately updating the preset data at a high speed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an embodiment of the present invention;
FIG. 2 is a graph illustrating the
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560 Process Controller, Barber-Colman, 8/1/1980.
Kinoshita Mitsuo
Obara Haruki
Fanuc Ltd
MacDonald Allen
Smith Jerry
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