JPH0441128A - Grip device of wire electrode - Google Patents

Abstract

PURPOSE:To grip a wire electrode without damaging it by exciting an exciting coil for closing as well as bringing a claw in contact with the wire electrode with elasticity of a spring by way of releasing excitation of an exciting coil for opening and by instructing the claw to grip the wire electrode by way of closing itself with the magnetic force of the coil and elasticity of the spring. CONSTITUTION:When excitation of an exciting coil 33 for opening is released so as to grip a wire electrode 1, a rod 31 is moved by elasticity of a spring 38, and subsequently, a claw 30 is closed so as to be brought in contact with the wire electrode 1. As an interval between a pole piece 32 and an exciting coil 34 for closing is at a specific value in this position, it is possible to grip the wire electrode 1 with a proper force by way of exciting the exciting coil 34, for closing afterward.

Description

[Detailed Description of the Invention] [Industrial Application Field] In a wire-cut electrical discharge machining device that performs electrical discharge machining on a workpiece using a wire electrode, a wire electrode is fed into a pipe electrode for machining a start hole, etc. A pair of grips is used to clamp and grasp the wire electrode and pull it out or send it out during automatic mounting, such as automatic insertion of the wire electrode, at the start or end of machining due to wire electrode breakage accidents, changes in the machining area, etc. Relating to a claw device.

[Conventional technology]

Conventional wire-cut electrical discharge machining equipment consists of a wire electrode for machining the workpiece, a reel that applies tension to this wire electrode, and a tension that applies tension to the wire electrode while drawing out the wire electrode from this reel. a roller, a feed roller that sends the wire electrode in the bowed direction,
A guide roller that guides and feeds the wire electrode, or
Furthermore, there is a pipe electrode for machining a start hole in the workpiece, and a pair of grasping claw devices that feed the wire electrode intermittently into this pipe electrode each have a pair of claws that open and close around a hinge pin, and A rod that engages with the pawl with a pin and is supported so as to be movable in the axial direction in order to open and close the pawl, a magnetic pole piece fixed to the rod, and a closing mechanism that excites the magnetic pole piece to open the pawl. A closing excitation coil that also excites the magnetic pole pieces to close the claws, and a closing excitation coil that can be fixed by changing its position in order to adjust the closing force. and a case for accommodating magnetic pole pieces and the like.

[Problem to be solved by the invention]

When grasping a wire electrode with a conventional grasping device, the closing excitation coil is energized to move the rod, the claw is opened and the wire electrode is passed through, and then the closing excitation coil is energized and the rod is reversed. Move in the direction of and close the claw to grasp the wire electrode. At that time, the gripping force was adjusted by minutely moving the closing excitation coil to adjust the distance between it and the magnetic pole piece, and the attraction force generated by the distance was used to maintain a predetermined gripping force. Therefore, when the magnetic pole piece is attracted to the closing excitation coil and begins to close the open claw, the excitation force is equal to the excitation force required to grasp the wire electrode when the claw is closed, and the excitation force of the closing excitation coil. It was not possible to set it arbitrarily due to the location.

Moreover, there was a drawback that the wire electrodes were damaged by the impact of the claws that closed at the moment of excitation. Therefore, the present invention has been made to provide a wire electrode grasping device that eliminates this drawback.

[Means to solve the problem]

The wire electrode grasping device of the present invention that achieves the above object includes a pair of pawls that open and close around a hinge pin, and a pin that engages with the pawls to open and close the pawls, and is movable in the axial direction. A rod supported as such, a magnetic pole piece fixed to the rod, a closing excitation coil that excites the magnetic pole piece to open the pawl, and also excites the magnetic pole piece to close the pawl and adjust the closing force. a closing excitation coil that can be fixed at a different distance from the magnetic pole piece in order to accommodate the closing excitation coil, a case that accommodates the closing excitation coil, the closing excitation coil, the magnetic pole piece, etc., and a spring rod provided on the rod; The fixing member fixed to the end of the spring rod, the spring provided between the fixing member and the case, and the closing excitation coil are de-energized and the claw is brought into contact with the wire electrode by the elasticity of the spring. The present invention includes a control device that energizes the closing excitation coil and instructs the claw to close and grip the wire electrode using the magnetic force of the closing excitation coil and the elasticity of the spring.

[Effect]

Therefore, when the excitation coil for closing is de-energized in order to grasp the wire electrode, the rod moves by the elasticity of the spring, and the claws close accordingly and come into contact with the wire electrode. At this position, the distance between the magnetic pole piece and the closing excitation coil is at a predetermined value, so the wire electrode is then grasped by exciting the closing excitation coil.

〔Example〕

The present invention will be explained based on the drawings that illustrate the invention.

The wire-cut electric discharge machining apparatus equipped with the present invention is shown in FIG.
Then, pack tension is applied to the wire electrode 1 and it is fed out. Then, the wire electrode 1 was pulled out from the reel 6, and a tension roller 9 driven by the motor 8 so that tension was generated in the wire electrode 1 by the take-up roller 7 was pulled out. There is a feed roller 10 consisting of a capstan and a pinch roller for feeding in the direction. A pair of feed rollers 10 that sandwich and feed the wire electrode 1 are driven by a motor (not shown), which is connected to the motor by a one-way clutch (not shown), and the wire electrode 1 is connected to the winding roller 7. During wire-cut electrical discharge machining, which is being pulled and moved, it idles.

Below the feed roller 10 there are a pair of gripping devices 2 and 3 for feeding the wire electrode 1 toward a pipe electrode 12 for machining a start hole and for guiding the wire electrode. When cutting with the cutting device 13, the feed roller 10 can be braked with a brake 14 operated by a solenoid or the like. A head 16 equipped with a chuck 15 and the like provided to support the pipe electrode 12 is supported by a column 5, and is adjusted and positioned in the vertical direction by rotating a pinion 18 that engages with a rack 17 with a motor 19. Ru. Inside the upper nozzle 21 attached to the vertically movable shaft 20 of the head 16, there is housed a current-carrying member for supplying electricity to the wire electrode 1 and an upper guide for the wire electrode I that opens and closes using hydraulic pressure. A sensor 23 is provided that detects when the tip of the pipe electrode 12 comes into contact with the center of the lower nozzle 22 provided opposite to the upper nozzle 21, and a lower part that supports this sensor 23 and the lower nozzle 22 is provided. The arm 24 is provided with the aforementioned winding roller 7. A workpiece 25 facing the wire electrode 1 is attached to a processing table 26,
The processing table 26 is attached to a table 27 that moves in X-axis and Y-axis directions perpendicular to each other, and the workpiece 25 and table 27 are surrounded by a table cover 28.

Pipe electrode 1 for drilling a start hole in this workpiece 25
As shown in FIG. 1(a), the grasping device 2 and the grasping device 3 for inserting the wire electrode 1 into the wire electrode 2 have a pair of claws 30 that open and close around a hinge pin 29, and a pair of claws 30 that open and close the winter melon to open and close the claws 30. A rod 31 is engaged with the mold 3o by a pin 49 and supported so as to be movable in the axial direction, a magnetic pole piece 32 is fixed to the rod 31, and a magnetic pole piece 32 is energized to open and close the mold 30. Excitation coil 33 and magnetic pole piece 32
so that the spacing between the magnetic pole pieces 32 can be changed in order to excite the claws 3o and adjust the closing force.
Although not shown, the closing excitation coil 34 has a threaded portion on the outside, and a nut screwed into the threaded portion can be rotated and fixed. A case 35 that accommodates the excitation coil 33, the magnetic pole piece 32, etc.
and a spring rod 36 provided on the rod 31,
A fixing member 3 fixed to the end of this spring rod 36
7, a spring 38 provided between the fixing member 37 and the case 35, and a cover 39 covering these. Furthermore, as shown in FIG. 1(b), this spring rod 36 is provided with a threaded portion 40, and a pair of nuts 41 are screwed into the spring rod 36 to fix the fixing member 37 by changing its position. The elasticity of the spring 38 may be adjustable. Although not shown, when the closing excitation coil 33 is de-energized, the claw 30 moves to the spring 38.
The elasticity of the claws contacts and clamps the wire electrode 1, and the closing excitation coil 34 is excited, and the magnetic force of the closing excitation coil 34 and the elasticity of the spring 38 close the claws 30 to grasp the wire electrode 1. The system is equipped with a control device that instructs the user to perform the following steps. In the embodiment shown in FIGS. 2 and 3, the wire electrode can be sent out by moving in the axial direction of the wire electrode with only one of the grasping devices 2.3 grasping the wire electrode 1. The grasping device 2 is fixed to the upper plate 42, and the grasping device 3 is supported so as to be movable along an axis 44 of a sub-plate 43 fixed to the upper plate 42, and is supported by a spring 45. The grasping device 3 is moved up and down by a predetermined distance by a vertical cylinder 46. The cylinder 46 sends the grasping device 3 holding the wire electrode 1 toward the grasping device 2 with the claw 30 open, and then the claw 3o of the grasping device 2 is closed to grasp the wire electrode 1. Next, the claw 30 of the grasping device 3 is opened and raised by the elasticity of the cylinder 46 and spring 45. In this way, the wire electrode 1 is fed into the pipe electrode 12 by combining the grasping device 2 that opens and closes the claw 30 in a stationary position and the opening and closing of the claw 3o of the grasping device 3 that moves up and down a predetermined distance.

〔Effect of the invention〕

According to the present invention, when the excitation coil for closing is de-energized in order to grasp the wire electrode, the rod moves with the elasticity of the preset spring, and the claws close accordingly and come into contact with the wire electrode. The piece is attracted to the closing excitation coil,
Even when there is a gap between the magnetic pole piece and the closing excitation coil and the excitation force of the closing excitation coil does not sufficiently act on the magnetic pole piece, the claw is completely closed by the elasticity of the spring. Furthermore, since the claws come into contact with the wire electrodes due to the elasticity of the springs, they will not damage soft wire electrodes like copper. At this position, the distance between the magnetic pole piece and the closing excitation is at a predetermined value, and the wire electrode can be gripped by a claw on which a predetermined excitation force and the elasticity of the spring act.

[Brief explanation of drawings]

FIG. 1(a) is a partially cross-sectional top view of a wire electrode grasping device according to an embodiment of the present invention, FIG. 1(b) is a partially changed view, and FIG. 2 is an electrode grasping device of FIG. 1. FIG. 3 is a bottom view of the part where a pair of devices are attached, FIG. 3 is a view taken in the direction of arrow A in FIG. . 1・・・・・・・・・・・・Wire electrode 2.3・
...... Grasping device 30 ...... Claw 31 ...... Rod 32 ......・Magnetic pole piece 33......Closing excitation coil 34...
・・・・・・・・・Closing excitation coil 35・・・・・・
······Case

Claims (2)

[Claims] (1) A wire electrode for processing a workpiece, a reel for storing this wire electrode, the wire electrode is pulled out from the reel, and the wire electrode is run between a pair of positioning guides with tension applied to the wire electrode, and During processing, the workpiece and the wire electrode are placed opposite each other, and when the wire electrode is disconnected or the processing area is changed, automatic insertion of the wire electrode is performed at the start and end of processing, etc. , in the wire electrode grasping claw device for pinching and grasping the wire electrode and pulling it out or sending it out, the wire electrode grasping claw device includes a pair of claws that open and close around a hinge pin; and a pair of claws that open and close around a hinge pin; a rod engaged with the pawl by a pin and supported so as to be movable in the axial direction, a magnetic pole piece provided on the rod, and an opening excitation coil that excites the magnetic pole piece to open the pawl;
A closing excitation coil that similarly excites the magnetic pole piece to close the claw and can be fixed at a different distance from the magnetic pole piece in order to adjust the closing force, and this closing excitation coil and opening excitation coil. a case housing a magnetic pole piece, etc., a spring rod provided on the rod, a fixing member fixed to the end of the spring rod, a spring provided between the fixing member and the case, and the opening excitation. The coil is de-energized and the claw is brought into contact with the wire electrode by the elasticity of the spring, and the closing excitation coil is energized, and the claw is closed by the magnetic force of the closing excitation coil and the elasticity of the spring to grasp the wire electrode. A device for grasping a wire electrode, comprising: a control device for instructing the wire electrode. (2) The wire electrode grasping device according to claim 1, wherein the fixing member is supported by a nut that can be moved and fixed in the axial direction of the rod.