Wire electric discharge machine having wire electrode tension control function
A wire electrical discharge machine and tension control technology, applied in electrode manufacturing, electric machining equipment, program control, etc., can solve the problems of machining accuracy, inability to solve the problem of wire vibration, and no disclosure of wire vibration, so as to suppress the vibration. Effect
Inactive Publication Date: 2014-10-15
FANUC LTD
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Problems solved by technology
[0008] However, in the above-mentioned method, the direction of the wire electrode against the wire guide rail changes, and the vibration of the wire electrode caused by the change of the force of the wire electrode against the wire guide rail cannot be solved. As a result, there is a problem that affects the machining accuracy. question
In addition, in the case of different taper angles due to different plate thicknesses, the tension control method and the determination / adjustment method of the filter of the tension control circuit may also be the same if the travel path length of the electrode wire is the same. does not disclose the treatment method for the vibration of the electrode wire caused by the change of the direction of the electrode wire against the electrode wire guide rail and the change of the resisting force that may occur in this case
Method used
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[0020] The configuration of an embodiment of the wire electrical discharge machine according to the present invention will be described with reference to the drawings.
[0021] The wire electrical discharge machine includes a control device 13 that performs drive control of motors and the like of each part. The wire electrode 1 is wound around the wire electrode bobbin 12 . The wire electrode spool 12 is pulled and rotated as the wire electrode 1 is fed out. Appropriate resistance is provided by a torque motor (not shown) or a friction brake so that the wire electrode 1 does not loosen due to excessive rotation of the wire electrode bobbin 12 . The "moderate resistance" given to the wire electrode 1 includes resistance electrically controlled by a torque motor or mechanical resistance such as friction brakes.
[0022] The wire electrode 1 reaches the supply roller 8 via the guide roller 11 driven by the supply motor (first motor) 6 . The electrode wire 1 sent out via the su...
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In a taper machining using a wire electric discharge machine, a difference between a target tension value and an actual tension value of a wire electrode is fed back to a controller to determine input current values to a wire electrode feed motor and a wire electrode deliver motor, thereby adjusting the tension value of the wire electrode. When the taper angle of the wire electrode exceeds a given value, the control gain of the tension of the wire electrode for determining the input current value to the motor is lowered to prevent the wire electrode from oscillating.
Description
technical field [0001] The present invention relates to a wire electric discharge machine, and more particularly to a wire electric discharge machine having a wire tension control function for suppressing vibration of the wire during tapered machining. Background technique [0002] The wire electric discharge machine winds the electrode wire on the electrode wire bobbin, and the electrode wire is wound from the electrode wire bobbin through a predetermined electrode wire path while maintaining a predetermined speed and tension. Wire electrical discharge machining makes the wire electrode between the upper wire guide rail and the lower wire guide rail run relatively relative to the workpiece by making the wire electrode run between the upper wire electrode guide rail and the lower electrode wire guide rail in a state where a predetermined tension is given. The workpiece is opposed to the workpiece with a small gap, and in the state where the machining fluid is interposed in t...
Claims
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IPC IPC(8): B23H7/10
CPCB23H1/00B23H7/06B23H7/104G05B2219/45221B23H7/065B23H7/10
Inventor 葛西广嗣
Owner FANUC LTD