JPS59205229A - Wire electrode feeder for wire-cut electric discharge machining device - Google Patents

Abstract

PURPOSE:To make a nonrigid wire electrode automatically feedable to the extent of the final stage of work securely, by adding such a pipe as capable of guiding the wire electrode, to a winding mechanism, while making the guide pipe into being free of rotation. CONSTITUTION:When a wire electrode 38 is snapped off, a pipe guide 36 keeping a state of stoppage by means of a plugging mechanism 74 is made to go up, discharging the remainder of a snapped wire outside through a winding mechanism 74. Then, the pipe guide 36 is shifted onto the same axis of a cutting start hole 12a for a work 10 and made to go down so as to come into contact with an electrode guide 72, and under this condition, when the wire 38 is fed, the tip end is nipped between a belt 76d and a roller 76b whereby securely guided to a position where it should be by a rotating guide pipe 79f without receiving any frictional resistance and rolled round by the winding mechanism. Next, the pipe guide 36 is made one to go up and then back to the snapped spot without making discharge in the manner of the existing cutting process, starting the discharge again. Thus, automatic feed for the wire electrode comes possible to be done.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a wire electrode supply device for a wire-cut electrical discharge machining device, in particular, when the wire electrode of the electrical discharge machining device (wire cuff) is disconnected during cutting, a new wire electrode is connected to the pipe guide. The wire electrode can be lowered and fed at a predetermined position, or it can be fed at a position where the pipe guide is in contact with the workpiece. This invention relates to a wire electrode supply device for a wire-cut electrical discharge machining apparatus that can automatically cut a wire electrode and automatically supply the wire electrode to the next cutting location.

A wire electrode that faces the workpiece through a small gap, repeatedly generates a bus discharge between the workpiece and the wire electrode, and uses the discharge energy to cut the workpiece. BACKGROUND ART Cut electric discharge machining devices are well known and have the advantage of being able to easily perform complex cutting operations on hard metals and the like with high precision.

Therefore, when a workpiece is to be processed by electrical discharge cutting, it is necessary to feed the wire electrode so that it passes through the workpiece. Wire electrodes are usually made of thin metal, and it is difficult to manually feed them through the workpiece, and wire electrodes often break due to abnormal situations, especially during electrical discharge machining. Conventionally, the operator was forced to carry out the troublesome task of supplying the electrode to the wire P each time. Furthermore, when performing progressive cutting, for example, V in the same workpiece is
CW When there are several separate cutting parts, conventionally, after cutting one cutting part, the wire electrode is cut and removed, and then the next cutting process is started by manually applying wire g glue. Therefore, it is not possible to fully automate the Wirecap electrical discharge machining equipment.
This was a factor that significantly reduced the processing efficiency.

The present invention has been made in consideration of the above-mentioned conventional problems, and
The purpose of this is to automatically cut the wire electrode at a predetermined position that can be fully automated with the wire cut drop machining device, remove the wire electrode that remains after cutting, and place the pipe guide outside the workpiece at the position where you want the wire electrode to penetrate. A warming wire electrode with a hole larger than the diameter can be passed through the workpiece together with the pipe guide and automatically fed at a predetermined position (the same goes for the outside of the workpiece), or It is an object of the present invention to provide a wire electrode feeding device for a wire cut drop machining device that can automatically feed a pipe guide when the hole diameter is smaller than the outer diameter of the pipe guide.

In order to achieve the above object, the present invention makes a wire electrode face the workpiece through a small gap, generates a bulk electric discharge between the workpiece and the wire electrode, and generates discharge energy. The wire cut drop machining device that cuts the workpiece is pressed, and a sclerotia guide that slidably supports the wire electrode is installed inside the tip ((N) with the pipe guide and the workpiece interposed between them. An electrode guide that slidably supports a wire electrode at a position facing the pipe guide, a movable fence groove that moves the pipe guide so as to penetrate through the workpiece, and a contact between the pipe guide and the workpiece. A detector that detects the
A pair of roller mechanisms equipped with a reversal prevention mechanism capable of supplying the wire electrode into the pipe guide and preventing the wire electrode from coming out of the pipe guide when the wire M pole is disconnected, and a pair of roller mechanisms that hold the wire electrode in a predetermined position. Cut at the position,
a cutting mechanism that removes the cut remaining part of the wire electrode; a winding mechanism that winds up the tip of the wire electrode that has been supplied so as to penetrate through the workpiece, and also winds up and removes the remaining part of the broken wire electrode; It is characterized by a tensile tension mechanism that prevents the wire electrode from sagging and always provides the necessary tension for processing.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a preferred embodiment of the wire electrode supply device according to the present invention.

(1G is a workpiece, which is placed on an XY cross table (not shown) that is movable in a horizontal plane.

(12a) and (121)) fl are cutting process start holes drilled in advance on the surface of the workpiece αO. 10 (a) is a guide supporting the wire electrode supply device, and 50 (a) is a guide that is fixed to the main body (not shown) of the wire-cut electrical discharge machining device on a shaft that can move in the Z-axis direction, that is, in the vertical direction. This is a slider that constitutes a part of the mechanism 071, and is provided so that it can freely slide up and down along the guide α4. A drive screw (A) is screwed into the slider OQ, and the upper end of the drive screw 6 is fixed to the upper part of the guide 04 and connected to a drive motor (A).
slider cd automatically slides along the guide (+4) by the screw and drive motor (a).

A roller mechanism @ is provided on the slider θQ. The roller mechanism (A) consists of a pair of wire electrode feeding pulley Q4 and a clamp pulley (A), and the rotation axis of the wire feeding pulley (A) is connected to the wire electrode feeding motor (A) fixed to the slider OQ. connected, and
A reversal prevention mechanism is attached to the wire electrode feeding pulley (c). Furthermore, the clamp pulley (to) is connected to the pin (
The link (to) is rotatably fixed to the slider 0Q via the link (to), and is rotatably supported at the tip of the link (to), and the rear end of the link (to) is connected to the slider 0Q via the coil spring (b). Due to the elastic force of the spring (B) in the coil, the wires 7 are always pressed against the clamp pulley (To) at the tip of the link &J and the peripheral edge of the feeding pulley (C). (To) is a pipe guide (in the example, it was a pipe with an outer diameter of 2 to 3 mm) into which the wire electrode (To) can be inserted and supported, and its upper end is attached to the fitting (A). It is fixed to the slider 0tS, which constitutes the moving mechanism α force, through it.

An N-pole guide (shown in FIG. 2) that slidably supports the wire electrode (to) is fitted into the lower end of the pipe guide (g). In addition, the pipe guide (to) and workpiece 01
A predetermined voltage ω is applied between them, and when the pipe guide (to) and the workpiece OQ come into contact, a signal is output from the detector 01), and the Eri drive mode (A) is applied to this signal.
At the same time, the wire electrode feeding motor (c) is driven, and the wire electrode (to) is cut out from the pipe guide (to). A clamp mechanism 02 is provided at the lower end of the guide Q41 to support and fix the pipe guide (to) at a predetermined position. The clamp mechanism 02 has a guide 0
4) A clamp plate (44
Solenoid (g) fixed to a) and guide 04)
It consists of a clamp plate (441) connected to the
) is separated from the other clamp plate (44a) and the clamped state is released (1), and when the solenoid (G) is returned to its original position, the coil spring (1) held between the solenoid (G) and the clamp plate (441)) is released. Due to the elastic force of c), one clamp plate (44b) approaches the other clamp plate (44al) and maintains the clamped state.

(to) is a cutting mechanism that cuts the wire electrode (to) at a predetermined position and eliminates the cut remaining portion of the wire electrode (to), and 62
is an arm of the main body, which is fixed to the rotating shaft of the drive motor (2) by the arm 621d and a drive motor (Incorporated) fixed to the side wall surface of the guide α4 so that daytime work can be carried out in a horizontal plane. Inside the arm 502, there is a rod (to) that can freely slide along the arm, and is rotatably fixed via a solenoid and a pin that are also fixed to the arm 6. When the solenoid (to) is operated by link IB, the rod (to) is connected to arm 1 via link 62.
Move toward the tip of 5. A coil spring is installed between the rear end of the loft and the Team F) 29111 wall, and when the solenoid is released, the restoring force of the coil spring causes the rod to move to the rear of the arm. Slide back to . A cutter and a clamp pin are fixed on the tip of the loft.

(to the rod) toward the tip of the arm 62, and fix the wire electrode (to) inserted between the tip of the rod (a) and the inner wall surface of the arm 6 with a clamp pin,
Can be cut with a knife. On the other hand, a coil spring I70 is clamped between the clamp pin (7) and the end surface of the loft (A), and provides a predetermined elastic force to the clamp bottle.

172 is the above-mentioned pipe guide (
The electrode guide (C) is provided at a position opposite to the electrode guide in (C), into which the wire N pole (C) is slidably inserted to support the wire electrode (C) in a fixed position. Below the electrode guide (C), the tip of the wire electrode (Y) supplied so as to pass through the workpiece αO is wound up, and the remaining part of the broken wire electrode (A) is also wound up and the workpiece A winding mechanism Q4 is provided to remove the winding mechanism from inside αO. Winding mechanism (3 pieces for some of 7→) tel --=7-
(76a) (761)) Consists of a belt (761) and a belt (76d) between (76a3 and (76C)).
) is attached, and the three rollers are provided so that their peripheral edges are in pressure contact with each other via a belt (76d), and the rotating shaft of one roller (76b) is attached to the winding motor). (79aX7gb)
and a bell) (790), and is connected to another winding roller (79d), and a roller (79θ) is provided in pressure contact with (79d), between each winding part. A guide pipe (79f) is provided. The guide pipe (79f) has bearings (200) (201
), and a gear (202) is attached to one end thereof. Furthermore, a gear (208) is attached to the motor (2043) in a pair with the gear (202).A voltage (208) is also applied between the roller (79θ) and the wire electrode (to) on the pipe guide (to). A) is applied, and if conduction is established, a signal is output from the detector (A).In addition, a wire electrode (C) is placed above the guide a to prevent the wire electrode (C) from sagging, and the predetermined tension necessary for machining is always applied to the wire electrode. (7) A tension mechanism (A) is provided for applying the voltage to the wire.
Wire N to prevent the wire electrode (c) from slipping off the bobbin.
It consists of a torque motor that rotates in the opposite direction to the pole feeding direction.
C Constant K A constant repulsive force is applied to the feeding direction of the wire N pole (■).

FIG. 2 is an enlarged cross-sectional view when the above-mentioned wire N-pole supply device is used to feed the wire electrode together with the pipe guide so as to penetrate the workpiece, and FIG. FIG. 3 is an enlarged cross-sectional view when supplying a wire electrode in contact with an object.

Components that are the same as those in FIG. 1 are given the same reference numerals and their explanations will be omitted. (G) is an electrode guide fitted to the tip inside the pipe guide C, which is a die-shaped guide made of diamond.
The structure is fitted into the pipe guide C through a sintered metal body. Also, in the electrode guide, which is also located below the workpiece 01, a diamond die-shaped guide (G) is fixedly supported by a sintered metal body (T), and a tapered wire is introduced to the die-shaped guide (G). The entrance of the section (e) has a structure in which the outer diameter of the pipe guide (to) is larger than that of the pipe guide.

When attempting to automatically supply wires to the N pole of the cutting start holes (12a) and (1-2b) on the surface of the workpiece α1 in the above configuration, one of the cutting start holes For example, move the pipe guide (to) coaxially with (12a) relative to the workpiece 01, operate solenoid ■, open the ramp mechanism (A3), and move the pipe guide (to). After setting it to the released state and operating the drive motor to move the slider αQ above the guide 04 and moving the pipe guide (to) to the top of the guide α,
Activate the roller mechanism ω of slider 00 and wire?
Feed the wire electrode into the pipe guide until the tip of ffl'@ extends an appropriate amount from the lower end of the pipe guide. Next, the drive motor of the cutting mechanism ω is activated to rotate the arm 6 by 80° toward the wire electrode (toward), and the solenoid is activated to rotate the blade at the tip of the rod (A). Wire 'FflJa (support)
Fold the pipe guide (towards it) from the lower end, leaving a length of 3 to 10 ffjf in the first embodiment.

While the cut remaining wire electrode remains clamped by the clamp ring at the tip of the rod, the drive motor is operated to return the γ-muro to its original position, and then the clamp ring is The remaining part of the wire N pole (to) is removed by releasing the clamp state of the wire. Next, operate the drive motor (e) above the guide 04, move the slider Q down along the guide 04), and start cutting the workpiece 00 with the pipe guide (to) fixed to the slider Qln. If the hole (12a) is larger than the outer diameter of the pipe guide (to), it is passed through and lowered to the front of the electrode guide (a) below the workpiece 0I. Also, the cutting process start hole (1, 2a
) is small in outer diameter of the pipe guide (G), it comes into contact with the workpiece surface and is lowered to the point where the detector 0■ is activated.

The state after performing the above operations is shown in FIGS. 2 and 3. After achieving this state, operate the roller mechanism (c) on the slider OQ to feed the wire electrode (to) into the pipe guide (to) again, penetrating the inside of the electrode guide (g) and ni). Then, the tip of the wire electrode can is wound up by the winding mechanism f→. At this time, the guide pipe (79f) is rotated by the motor (204) to reduce the frictional force between the wire electrode (c) inside the guide pipe (79f) and the inner surface of the pipe, ensuring the guide of the tip of the wire electrode can. I'm going to make it.

Furthermore, the wire electrode cormorant o −”y −(79dl (7
9e) When Ic is reached, the detector (A) operates, stops the operation of the roller mechanism (A), stops the winding mechanism Q4, and operates the drive motor to guide the slider Oe04) Raise along the pipe guide (
7) If it is penetrating through the workpiece oO, remove it.
If the workpiece QnK is in contact, the contact is released.

After the mechanical adjustment, return the solenoid (to) at the specified position,
The lower end of the pipe guide (end) is fixed to the Eri Guide 04 using the clamp mechanism <42 of the guide 0 planting section. Like this 0(
1, the wire electrode (to) can be automatically supplied to the cutting start hole (12a) in the workpiece by penetrating the inside of the workpiece 01.

Next, a case will be described in which the wire electrode is automatically supplied again when an abnormal situation occurs during electrical discharge machining and the wire electrode is disconnected. If the wire electrode (A) breaks, the roller mechanism (A) on the slider OQ is equipped with a reverse prevention mechanism (1), so the tension mechanism above the guide (+4) will cause the wire electrode (A) to become disconnected from the pipe guide (A). ) Pull out the middle edge, and maintain the state of the hole clamped by the roller mechanism (c). Therefore, wire electrode 08 habobin 6
The area between the pipe guide and the pipe guide is stopped, the rotation of the rotation detector is stopped, and it is determined that the wire electrode is broken during processing.

At this time, the clamp mechanism [Co., Ltd.] 2 at the lower end of the guide 04 is opened to open the pipe guide (to), and the drive motor is rotated to raise the pipe guide (to) to the top of the guide α. , operate the winding mechanism (7→) to take up and remove the remaining part of the broken wire electrode (to) from the workpiece 00. Next, move the pipe guide (to) to the workpiece α1. It is moved relatively so that it is coaxial with the cutting start hole (12a) of the workpiece 00, and thereafter the above-mentioned cutting start hole (12a NC wire electrode (to)
The wire electrode supply device is operated according to the method for supplying the wire electrode (g) to automatically supply the wire electrode (g) so as to penetrate through the workpiece αO. After that, the wire electrode (c) is connected to the workpiece 00 at the position where the wire electrode (to) is disconnected.
The wire is moved without electric discharge following the cutting process, and after reaching the disconnection point, electric discharge cutting is started again. In addition,
It is preferable that the above-mentioned relative movement of the wire N pole (toward) into the workpiece aO be automatically performed using a CNC control device (not shown) provided in the wire-cut electric discharge machining apparatus.

Next, a method for supplying wire electrodes when the same workpiece 00 has a plurality of separate cutting locations will be described.

After cutting one cutting point on the separated workpiece 00, stop the winding motor Q frame below the workpiece (10) that was rotating during the cutting process, and stop the movement of the wire electrode (to). Stop. Next, tighten the solenoid (
The pipe guide 04) is operated to release the clamped state, and the drive motor at the top of the guide 04) is operated to raise the pipe guide to the top of the guide 04. Then the cutting mechanism (
Rotate the arm (to) toward the wire electrode (to), operate the solenoid (to), cut the wire N pole (to) with a knife, and rotate the winding motor Q→. A winding mechanism H removes the cut portion of the wire city vi from the workpiece 01. Then, rotate the cutting mechanism φ again to the original position so as to separate it from the wire electrode polish, and then rotate the cutting mechanism φ back to the original position to separate it from the wire electrode polish.
)) and the pipe guy)' (to) are coaxial, move the workpiece Qll, and insert the cutting process start hole (12a) described above.
), operate the wire electrode supply device according to the method of supplying the wire electrode (A) to automatically supply the wire electrode (A) so as to penetrate the inside of the workpiece 01, and continue the electrical discharge cutting process. Do it like this. Note that the torque motor (c) of the tension mechanism (a) above the guide 04) applies torque in the opposite direction to the feeding direction of the wire electrode (to) to the bobbin (
b) always given to the wire electrode (to) with respect to the feeding direction,
It functions to apply a certain tension to the wire electrode (to), and when the pipe guide (to) is lifted from guide α to the top with the wire N pole (c) clamped by the roller mechanism (a), This prevents the wire electrode (c) from sagging between the bobbin (a) and the troller mechanism @.

As described above, according to the wire electrode supply device of the wire-cut electrical discharge machining apparatus according to the present invention, when an abnormal situation occurs during cutting and the wire electrode is disconnected, the wire remaining at both poles of the wire is automatically removed from the workpiece. By removing the wire electrode from the workpiece and passing the wire electrode through the workpiece regardless of the machining starting hole diameter of the workpiece, it becomes possible to reliably and automatically supply a wire electrode without rigidity to the final stage. In addition, if there are multiple separate cutting locations in the same workpiece,
After finishing cutting at one cutting point, the wire electrode is automatically cut once and removed from the workpiece, and then the wire electrode is automatically supplied again to the next cutting point.
It becomes possible to continue cutting without human intervention. the result.

The wire electrode supply device is connected to the C
Automatic control using an NC control device enables full automation and unmanned wire-cut electrical discharge machining equipment, making it possible to significantly increase machining efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view showing a preferred embodiment of the wire electrode feeding device according to the present invention, and Fig. 2 shows the wire N when feeding the wire electrode by passing it through the workpiece.
A partially enlarged cross-sectional view of the pole supply device, Fig. 3 shows the mechanism in which the pipe guide contacts the workpiece and moves it, C2 is the clamp mechanism, the handle is the reversal prevention mechanism, (a) is the roller mechanism, ω is the cutting mechanism, f → is the winding mechanism, the ring is the tension mechanism, (200)
(201) is a bearing, (202) (29R1 is a gear,
(204) is a motor. Daiuto Masuo Ohatsu (1) Figure 2 Figure 3

Claims (1)

[Claims] A wire electrode is opposed to a workpiece through a small gap, a pulsed electric discharge is generated between the workpiece and the wire electrode, and the workpiece is energized by the energy of the discharge. A pipe guide which is a wire-cut electric discharge machining device for cutting, and which has an electrode guide inside the tip that slidably supports a wire electrode. an electrode guide that slidably supports a wire electrode at a position facing the pipe guide with a workpiece interposed therebetween; and a moving mechanism that moves the pipe guide in a certain direction of the pole guide facing the pipe guide. , a clamp mechanism that fixes the pipe guide in a predetermined position, and a clamp mechanism that moves together with the pipe guide to supply the wire electrode into the pipe guide and prevent the wire electrode from coming out from inside the pipe guide when the wire electrode breaks. A pair of roller mechanisms equipped with a reversal prevention mechanism that can prevent the wire from rotating, a cutting mechanism that cuts the wire electrode at a predetermined position and removes the cut remaining portion of the wire electrode, and a cutting mechanism that cuts the wire electrode at a predetermined position and removes the uncut portion of the wire electrode. A winding squaring mechanism that guides and winds up the tip of the broken wire electrode, and also winds up and removes the remaining part of the broken wire electrode, prevents the wire electrode from sagging, and always provides the predetermined tension necessary for processing. A wire electrode supply device for a wire cut electric discharge machining apparatus comprising a tension mechanism, characterized in that a pipe for guiding the wire electrode is added to the winding cornering mechanism, and the pipe is configured to be rotatable. Equipment wire electrode feeding device.