JPS62124823A - Automatic wire electrode setting method and device for wire cut electric spark machine - Google Patents

Abstract

PURPOSE:To draw a wire electrode and automatically pass the wire electrode through a wire guide and a machining start hole for a workpiece by taking out a rigid rod-shaped substance to an electrode passage from a holder fitted to the side of the electrode passage and connecting the substance to the connection end of the wire electrode. CONSTITUTION:When the tip of a wire electrode 7 has reached a connecting device 24, guided by a guide member 70, a motor M stops, the tip is cut by a wire cut device 60 and a pipe takeout device 23 takes a pipe 21 out of a roller 22. When the motor M has been driven and the connection end of the electrode 7 has entered in the pipe end 21a, the connecting device 24 operates for connecting the electrode 7 to the pipe 21. An actuator 29 operates and clamping by a holding part 28 is released and the motor M is driven for feeding the pipe 21. In this state, a guide member 37 retreats and wire guides 10 and 11 become a guide for the pipe 21. And when the pipe 21 has been fed through a machining start hole 9c, the guide member 37 advances and becomes a guide for the electrode 7, thereby finishing an automatic insertion process.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a wire electrode that can be automatically set in a wire-cut electric discharge machining device, and is particularly suitable for small diameter wire electrodes. The present invention relates to a wire electrode automatic setting method and device.

(Prior art) A number of devices have been proposed that can automatically set wire electrodes in wire-cut electrical discharge machining equipment, but the biggest problem with automatic setting of wire electrodes is The problem is how to prevent buckling of the wire electrode that occurs during insertion when the wire electrode has a small diameter. In order to solve this problem, for example: 1) annealing the tip of the wire electrode to make it straight, so that the wire electrode can pass smoothly through the guide; 2) preparing a guide pipe, and The wire electrode is guided to the machining start hole by the wire guide, and K is applied to ensure that the wire electrode is inserted into the machining start hole.■When the wire guide is opened, a jet stream is applied and the wire is sent into the guide by this jet stream. , etc. have been proposed.

(Problems to be Solved by the Invention) Methods (1) and (2) are effective when the wire electrode has a certain degree of rigidity, but if the wire electrode has an extremely small diameter, the wire electrode may be damaged during feeding. If the wire comes into contact with the guide even slightly, it will buckle, making it impossible to maintain its straightness and making it impossible to insert the wire into the guide.On the other hand, method (2) If the machining starting hole is small in diameter, it is not possible to expect the insertion effect from the jet flow, and especially when setting the wire electrode in water or oil, the force caused by the jet flow will be significantly weakened. Therefore, there is a problem that automatic setting of the wire becomes impossible.

Therefore, an object of the present invention is to ensure automatic setting of even wire electrodes with extremely large shaft diameters. An object of the present invention is to provide a wire electrode automatic setting method and device for a wire-cut electrical discharge machining device.

(Means for Solving the Problems) The content of the method of the present invention for achieving the above object is that when the connecting end of the wire electrode is inserted into a predetermined wire guide and a machining start hole of a workpiece, the wire guide A part of the wire electrode is connected by fixation or the like to one end of a rod-like body that has at least the necessary rigidity to pass through the wire, and the wire electrode is pulled by the rod-like body to insert the wire electrode into the wire guide and the processing start hole. It is characterized by the fact that it is made as follows.

On the other hand, the contents of the apparatus of the present invention include a wire electrode supply device that supplies a wire electrode, a first wire guide that guides the wire electrode supplied from the wire electrode supply device, and a first wire guide that guides the wire electrode supplied from the wire electrode supply device.
An automatic wire electrode set for a wire-cut electrical discharge machining device, comprising a second wire guide r disposed opposite to the wire guide with the workpiece interposed therebetween, and a take-off device for taking out the wire electrode taken out through the second wire guide. In the device,
A holder that holds at least one rod-shaped body having at least the rigidity necessary to pass through the first and second wire guides, and a wire electrode supply M device for removing the rod-shaped body from the holder before setting the wire electrodes. a take-out device for arranging the rod-like body on the wire electrode path between the wire electrode passageway and the first wire guide; and a part of the wire electrode connected to the end of the rod-like body placed by the take-out device on the wire electrode supply device side. and a coupling device that allows the first and second wire guides to pass through the rod-shaped body and to a second state that guides the wire electrode. It has the characteristics of

(Function) When setting the wire electrode, when the wire electrode is paid out from the wire electrode supply device, the take-out device is activated and the rod-shaped body is taken out from the holder, and the taken-out rod-shaped body is attached to the wire. placed on the path of the electrode.

Thereafter, a portion of the wire electrode is connected to one end of this rod-shaped body by a connecting device by caulking or other appropriate means. Thereafter, the rod-shaped body is fed by the wire electrode feeding device in the same manner as the wire electrode, but since the rod-shaped body has an appropriate rigidity, it is returned to the first state without buckling. It passes through each wire guide and the machining start hole. After that, the wire electrode is pulled by the rod-shaped body and passes through the required wire guide and processing start hole, and the setting of the wire electrode is completed, and the wire electrode is pulled by each wire guide in the second state. You will be guided.

(Example) FIG. 1 is a schematic diagram showing a wire electrode running system of a wire set electric discharge machining apparatus equipped with a wire electrode automatic setting device according to the present invention.

A wire electrode 7 is fed out from a wire electrode feeding device 6 consisting of a wire electrode bin 2, a wire guide 4, and a pair of wire feeding rollers 5, 5, and the wire electrode 7 is placed on a workpiece by an automatic setting device 8, which will be described later. It will be sent out towards 9th. Wire electrode 71d is guided by the first wire guide 10 disposed on the upper surface 9a side of the workpiece 9 and inserted into the machining start hole 9c of the workpiece 9, and is disposed on the lower surface 9b side of the workpiece 9. The wire is guided by the second wire guide 11 and enters the wire transport device 12, where it is picked up by the transport pel of the wire transport device fft12 and taken up by the wire collection box 15.
be sent inside.

A first wire guide 10. A pipe, which is a rod-shaped body, is fixed to the free end (connection end) of the wire electrode 7 supplied from the wire electrode supply device 6, and the wire electrode 7 is guided by this pipe. In order to reliably insert the wire electrode 7 into the processing start hole 9c and the second wire guide 11, the automatic setting device 8 includes a holder 22 capable of holding a plurality of pipes 21 for guiding the wire electrode 7;
The device includes a dive takeout device 23 that takes out the dives 21 one by one from the holder 22 and places them on the wire electrode path between the wire electrode supply device 6 and the first wire guide 10. - A connecting device 24 for connecting a part of the wire electrode 7 to the pipe 21 is disposed near the end 21 of the pipe 21 taken out by the pipe taking out device 23 on the wire electrode supply device 6 side. .

The coupling device 24 is made up of an arm 26 that moves back and forth in its axial direction by a solenoid 25, and a fixed block 27 that is disposed opposite the arm 26 via a /4' eve 21, and is controlled by a control unit C/lJ. When the solenoid 25 is energized, the arm 26 moves toward the fixed block 27 and crushes the end 21a of the pipe 21. Pie f2 taken out by the pipe taking out device 23
1, the wire electrode supply devices 6 to 70 have a guide hole 70m having a large diameter on the inlet side of the wire electrode 7 and a small diameter on the outlet side. When the shear wire electrode 7 is fed out by a pair of wire feeding rollers 5, 5 driven by a motor M,
Ensure that the free end of the wire electrode 7 is connected to the end 21m of the pipe 21.
is fed into the hollow part of. The control unit C/lJ is
At the timing when the free end of the wire electrode 7 is fed into the hollow part of the /4'ear' 21, the solenoid 25 is energized to crush the end 21m of the armpit 21, thereby 21 and the wire electrode 7 can be fixed together.

In addition, what is indicated by the reference numeral 60 is a cutter 61 and the cutter 6.
When the actuator 62 is actuated by a signal from the control unit, the wire electrode 7 protruding from the lower end of the guide member 70 is cut by the cutter 61. Ru.

A? The tube removal device 23 includes a tube gripping section 28 for grasping and holding the armature tube 21, and a pipe gripping section 2.
8 and an actuator section 29 for performing pipe gripping operations. The actuator section 29 is actuated in response to a signal from the control unit C70, moves the knob gripping section 28 forward to approach the holder 22, takes out only one pipe 21, and controls the movement of this removed pipe. pipe 2
1 and move the pipe gripping part 28 backward while holding the pipe 21.
is positioned over the wire electrode 70 path. The gripping operation of the pipe 21 by the pipe gripping section 28 is released after the connection between the mother tube 21 and the wire electrode 7 is performed by the connecting device 24, and the wire electrode 7 is fed out by a pair of wire feeding rollers 5.5. Accordingly, the mother eve 21 is sent downward and sent to the first wire guide 10 by a pair of drive rollers 30, 30 disposed below the pipe gripping part 28.

The first wire guide 10 has insertion holes 31 and 32 formed on the upper and lower sides for passing the knob 21 and the wire electrode 7, and a machining fluid supply hole 33 for supplying machining fluid on the side thereof. It has a casing 34. Inside the casing 34, a pair of fixed guide members 35, 36 are arranged at intervals in the direction in which the wire electrode 7 passes, and a pair of fixed guide members 35, 36 are disposed between these fixed guide members 35, 36, and the wire is A movement guide member 37 is provided so as to be moved forward and backward in directions perpendicular to the direction of passage of the electrode 7 (directions of arrows A and B).

As shown in FIG. 2, the fixed guide members 35, 36 have cutouts 35& for guiding the wire electrode 7.

361 are formed respectively, and when the movable guide member 37 is advanced by the actuator 38 and positioned at the position shown by the dashed line, the notches 35m and 36b of the fixed guide members 35 and 36 and the movable guide member 37 The wire electrode 7 can be guided by the cutout 37b formed in the cutout 37b. On the other hand, when the movement guide member 37 is moved back in the direction of arrow B by the actuator 38 and reaches the position shown by the solid line, the area of the guide path formed by the notches 35m, 36m, and 37a becomes thicker. The condition is sufficient to pass 21. That is, the first wire guide 10 is moved by the movement guide member 37 by the actuator 38.
By adjusting the position, at least a first state in which the wire electrode 7 can be passed through and a second state in which the wire electrode 7 can be guided can be realized.

The second wire guide 11 is also the first wire guide 10 described above.
The structure is exactly the same as that of the first embodiment, and accordingly, corresponding parts are given the same reference numerals and explanations thereof will be omitted.

First and second wire guides 10.11 in the first state
and the pipe 21F sent out through the processing start hole 9C.
The i-wire enters the wire conveying device 12, is held between conveyor bells 13 and 14, and is fed into the wire recovery equipment 5.

Next, referring to FIG. 3, the holder 22 and the pipe take-out device 23 are
The configuration of this will be explained in detail. The holder 22 has an abbreviated shape.
It has a nine-eave presser 41, and the mother eave presser 41 is hinged to the main body block 43 by a hinge pin 42. The main body block 43 and the hinge bin 42 are firmly fixed to a frame (not shown). Eve presser foot 4
1 is biased toward the main body block 43 by a pressing spring 44. , the 4-ib presser 41 is attached to the main block 4
A plurality of blades 21 are held between the blade presser 41 and the main body block 43 by the force applied by the spring to the blade 3. In order to prevent these clamped mother ide 21 from escaping from the free end of the pipe holder 41, the free end of the pipe holder 41 is formed with a curved portion 45 that is slightly curved toward the opposite side. .

The arm presser 41 is also provided with a stop plate 46 for pressing pipes other than the outermost pipe held by the curved portion 45 toward the main body block 43. is housed in a notch 47 formed in the pipe holder 41, and is stopped by a stop spring 47 (see Fig. 4) disposed between the stop plate 46 and the main pipe holder 41. The plate 46 is biased by a spring so as to separate from the pipe holder 41. The spring force of the stop spring 47 is set so that when the pipe holder t41 is holding down the pipe 21 as shown in FIG. 3, the stop plate 46 is in close contact with the knob holder 41. has been done.

On the other hand, the knob extractor 23 is hinged to a slider 51 and a hinge bin 52 fixed to the slider 51, and has a pair of jaws at its mouth end for storing the arm f21. 54 and a movable intake holder 53 formed with a tube gripping portion 28. The actuator section 29 moves the slider 51 in the direction of arrow C,
a first actuator 29m for moving in the D direction;
and a second actuator 29b for opening and closing the movable intake holder 53. First actuator 29a
is fixed to a frame (not shown), and the slide end 51 connected to the first actuator 29a and the arm 55 is moved (by the first actuator 29a) in the directions of arrows C and D along a guide rail (not shown). This allows the pipe f22 to be taken out from the holder 22 and held, and the taken out pipe can be positioned at a predetermined position.

Figure 4 (al to Figure 4 (dl) shows the pipe removal device 2.
3 illustrates the operation of taking out only one mother eve 21 from the holder 22. To explain the operation of taking out the pipe with reference to FIGS. 3 and 4, first, the movable take-in holder 53 is opened by the second actuator 29b (
FIG. 4(a)) Then, the syslider 51 is moved in the direction of arrow C by the first actuator 29a, and the slider 51 is moved in the direction of arrow C.
A notch 5 formed in a portion facing the holder 22 side of the
1a into a predetermined fit with the main body block 43 (FIG. 4(el)), the second actuator 29b is actuated to close the movable intake holder 53, and the pair of jaws 5
4.54 and slider 51 to set the outermost no. Ig 21 is taken in. Next, when the first actuator 29a operates to move the slider 51 backward, the pipe holder 41 is opened against the spring force of the pressing spring 44, and the pipe 21 is taken out. At this time, due to the action of the stop plate 46 and the stop spring 47, even though the flat rib presser 4 was opened,
The remaining three pipes are pressed against the main body block 43 by a stop plate 46, so that these pipes are firmly held (see tel in FIG. 4).

At this time, the three remaining pipes f are pushed outward by the feed spring 48, so when the pipe holder 41 is closed again, the pipe 21Vi is moved to the right in FIG. The pipe is now ready for the next pipe removal operation.

Next, the operation of the automatic wire electrode setting device 1 will be explained with reference to FIG. When the tip of the wire electrode 7 fed out from the wire electrode device 6 is guided by the guide member 70 and reaches the vicinity of the coupling device 24, the drive of the motor M is stopped and the wire cutting device 60 is activated to cut the wire. Electrode 7
cutting is performed. Next, the pipe take-out device 23 is operated to take out the pipe 21 from the holder 22, and the taken-out pipe 21 is positioned at the position shown in FIG.

As a result, the end 21m of the pipe f21 and the connecting end of the wire electrode 7 face each other, and when the motor M is driven again, the connecting end of the wire electrode 7 fully enters the hollow part of the end 21m of the pipe 21. By the way, motor M is stopped. Next, the connecting device 24 is operated to crush the end portion 21a of the pipe f21, thereby fixing the pipe 21 and the wire electrode 7.

When the connection work between the guide 21 and the wire electrode 7 is completed in this way, the second actuator 29b is activated.
The clamping state of the pipe 21 by the tube gripping part 28 is released, the motor M is driven again, and the pipe 21 is fed toward the workpiece 9.

At this time, the first and second wire guides 10.11 are in the first state, and therefore the pipe 21 is in the first state.
The wire is sent to the wire conveying device 12 through the wire guide 10, the processing start hole 9c, and the second wire guide 11. In this way, the wire electrode 7 has the required rigidity and is guided by the arm rib 21 and inserted into the wire guide and processing start hole, so problems such as buckling do not occur at all, and the wire can be inserted extremely reliably. Automatic electrode setting is possible.

In the above embodiment, a pipe is used as the rod-shaped body for guiding the wire electrode 7, but the pipe is not limited to this, and any appropriate member suitable for the purpose can be used. The connection with the wire electrode is not limited to the crushing method shown in the embodiments, and it goes without saying that any known means, such as welding, bonding with an adhesive, etc., may be used.

(Effects) According to the present invention, as described above, the shear wire electrode can be automatically set by connecting a rod-like body having the necessary rigidity to the end of the wire and guiding the shear-wire electrode through the rod-like body. Therefore, even in the case of extremely thin wire electrodes,
Wire electrodes can be automatically set reliably.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a perspective view for explaining the structure of the wire guide shown in Fig. 1, and Fig. 3 is a holder and pipe extraction device shown in Fig. 1. 4 (aJ to 4 (dl) are operation explanatory diagrams for explaining the operation of taking out the mother tube from the shield holder by the pipe take-out device. 1...Wire electrode automatic setting device , 6... Wire electrode supply device, 7... Wire electrode, 8... Automatic setting device, 9... Workpiece, 9C... Machining start hole, 10
... first wire guide, 11 ... second wire guide, 12 ... wire conveyance device, 21 ... pipe, 22
...Holder, 23...9 Eve extraction device, 24...
・Connection device. Patent applicant Sodick Co., Ltd. Agent Patent attorney Masatoshi Takano Figure 4

Claims (1)

[Claims] 1. A device for automatically inserting the connecting end of a wire electrode supplied from a supply reel into a machining start hole of a workpiece and a pair of wire guides provided in the vicinity of the workpiece. In an automatic wire electrode setting method for a wire-cut electrical discharge machining device, a part of the wire electrode is connected to one end of a rod-shaped body having at least the rigidity necessary for passing through the wire guide, and the rod-shaped body is connected to the pair of wires. pulling the wire electrode by the rod-shaped body by passing it through a guide;
An automatic wire electrode setting method for a wire-cut electrical discharge machining apparatus, characterized in that the wire electrode is inserted through the pair of wire guides. 2. A wire electrode supply device that supplies a wire electrode, a first wire guide that guides the wire electrode supplied from the wire electrode supply device, and a first wire guide that is disposed opposite to the first wire guide with the workpiece interposed therebetween. In a wire electrode automatic setting device for a wire cut electrical discharge machining apparatus, the wire electrode automatic setting device includes a second wire guide and a take-off device for taking out the wire electrode taken out through the second wire guide. a holder for holding at least one rod-shaped body having at least the rigidity necessary for passing through the wire; a rod-shaped body in the holder is taken out from the holder prior to setting the wire electrode; and the wire electrode supply device and the first wire guide. and a connecting device that connects a part of the wire electrode to an end of the rod-like body placed by the take-out device on the wire electrode supplying device side. wherein the first and second wire guides are selectively switched to either a first state in which the rod-shaped body passes through the wire guide or a second state in which the wire electrode is guided through the first and second wire guides. An automatic wire electrode setting device for wire cut electric discharge machining equipment.