WIRE-CUT ELECTRIC DISCHARGE MACHINE HAVING WIRE TENSION CONTROL FUNCTION
First Claim
1. A wire-cut electric discharge machine having a wire tension control function, comprising:
- a first motor for feeding a wire electrode to a workpiece to be machined;
a second motor for delivering the wire electrode from the workpiece;
tension detecting means which is located between the workpiece and the first motor and detects a tension on the wire electrode;
speed detecting means for detecting respective rotational speeds of the first and second motors;
first control means for controlling the rotational speed of the first motor to be equal to a preset rotational speed;
second control means for controlling a rotational torque of the second motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value;
third control means for controlling the rotational speed of the second motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value; and
switching control means which causes the first control means to drivingly control the first motor, causes the second control means to perform torque control for the second motor, thereby running the wire electrode, and switches the second control means over to the third control means to perform speed control for the second motor when machining is started.
1 Assignment
0 Petitions
Accused Products
Abstract
When a wire electrode is arranged along a traveling path by manual operation, a motor M1 for feeding the wire electrode to a workpiece is driven in response to a predetermined torque command from a control section with a switch SW1 on a side a. The wire electrode is connected, and a motor M2 for delivering the electrode from the wire is driven at a predetermined speed, whereby the electrode is run. Then, the switch SW1 is shifted to a side b and a switch SW2 to the side a, and the motor M1 is subjected to torque control such that a tension on the wire electrode detected by a tension detector is equal to a command tension. When a variation of the tension on the wire electrode is converged, the switches SW1 and SW2 are shifted to the side b, speed control of the motor M1 is performed so that detected tension is equal to the command tension, and electric discharge machining is started.
18 Citations
8 Claims
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1. A wire-cut electric discharge machine having a wire tension control function, comprising:
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a first motor for feeding a wire electrode to a workpiece to be machined; a second motor for delivering the wire electrode from the workpiece; tension detecting means which is located between the workpiece and the first motor and detects a tension on the wire electrode; speed detecting means for detecting respective rotational speeds of the first and second motors; first control means for controlling the rotational speed of the first motor to be equal to a preset rotational speed; second control means for controlling a rotational torque of the second motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value; third control means for controlling the rotational speed of the second motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value; and switching control means which causes the first control means to drivingly control the first motor, causes the second control means to perform torque control for the second motor, thereby running the wire electrode, and switches the second control means over to the third control means to perform speed control for the second motor when machining is started. - View Dependent Claims (2, 3, 4)
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5. A wire-cut electric discharge machine having a wire tension control function, comprising:
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a first motor for feeding a wire electrode to a workpiece to be machined; a second motor for delivering the wire electrode from the workpiece; tension detecting means which is located between the workpiece and the first motor and detects a tension on the wire electrode; speed detecting means for detecting respective rotational speeds of the first and second motors; first control means for controlling the rotational speed of the second motor to be equal to a preset rotational speed; second control means for controlling a rotational torque of the first motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value; third control means for controlling the rotational speed of the first motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value; and switching control means which causes the first control means to drivingly control the second motor, causes the second control means to perform torque control for the first motor, thereby running the wire electrode, and switches the second control means over to the third control means to perform speed control for the first motor when machining is started. - View Dependent Claims (6, 7, 8)
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Specification