JPH0472648B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a wire electrode suitable for automatically setting a wire electrode in a wire cut electric discharge machining apparatus, and particularly suitable for a small diameter wire electrode. The present invention relates to an automatic electrode setting method and device.

(Prior Art) Various devices have been proposed in the past that are capable of automatically setting wire electrodes in wire-cut electric 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. To solve this problem, for example,
The tip of the wire electrode is annealed to make it straight, and a guide pipe is prepared so that the wire electrode can pass smoothly through the guide.The wire electrode is guided to the machining start hole by the guide pipe, and the wire electrode is Methods have been proposed to ensure that the wire is inserted into the machining start hole, to apply a jet jet when the wire guide is opened, and to feed the wire into the guide by the jet jet.

(Problems to be Solved by the Invention) Methods and are effective when the wire electrode has a certain degree of rigidity, but if the diameter of the wire electrode is extremely small, the wire electrode may become attached to the wire guide during feeding. If there is even a slight contact, buckling occurs, making it impossible to maintain its straightness and making it impossible to insert it into the wire guide. On the other hand, with the method (2), if the machining start hole of the workpiece is small in diameter, it is not possible to expect the insertion effect by the jet jet, and especially when setting the wire electrode in water or oil, the jet jet will not work. The problem is that the force becomes significantly weaker, making it impossible to automatically set the wire.

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

(Means for Solving the Problems) A feature of the method of the present invention for achieving the above object is that in the method of automatically inserting a wire electrode into a predetermined wire guide and a machining start hole of a workpiece, A wire electrode is inserted into a cylindrical body that has at least the rigidity necessary for operation, a part of the cylindrical body is crushed to fix the two, the wire electrode is pulled by the cylindrical body, and the wire guide and processing begin. The point is that it can be inserted through the hole.

On the other hand, the features of the device of the present invention include a wire electrode supply device that supplies a wire electrode, a pair of wire guides that guide the wire electrode supplied from the wire electrode supply device, and a wire taken out through the wire guide. An automatic wire electrode setting device for a wire cut electrical discharge machining machine, which is equipped with a pulling device for picking up an electrode, includes a holder for holding at least one cylindrical body having at least the rigidity necessary for wire setting operation, and a holder for holding at least one cylindrical body having at least the rigidity required for wire setting operation, and a holder for holding at least one cylindrical body having at least the rigidity required for wire setting operation, a take-out device that takes out the cylindrical body in the holder and places the cylindrical body on the wire electrode passage between the wire electrode supply device and one of the wire guides; A connecting device that fixes the wire electrode by inserting the free end of the wire electrode into the body and then crushing a part of the cylindrical body,
By transporting the cylindrical body along a required path by a feeding device, the wire electrode is pulled by the cylindrical body, and the wire electrode is automatically set.

(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 cylindrical body is taken out from the holder, and the taken out cylindrical body is placed on the path of the wire electrode. Placed.
Thereafter, by crushing a part of the cylindrical body with the connecting device, the part of the cylindrical body sandwiches the wire electrode, thereby fixing the wire electrode to the cylindrical body. After this, the tubular body is fed along the required path for the wire electrodes by the feeding device, and the tubular body has the required stiffness so that each wire guide can be guided without buckling. and passes through the machining start hole. As a result, the wire electrode is pulled by the cylindrical body and set in the desired travel path.

(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 supply device 6 consisting of a wire electrode bobbin 2, a wire guide 4, and a pair of wire feed rollers 5, 5, and the wire electrode 7 is directed toward a workpiece 9 by an automatic setting device 8, which will be described later. sent out. The wire electrode 7 is guided by a first wire guide 10 disposed on the upper surface 9a side of the workpiece 9, is inserted into the machining start hole 9c of the workpiece 9, and is inserted on the lower surface 9b side of the workpiece 9. The wire is guided by the provided second wire guide 11 and enters the wire conveying device 12, is picked up by the conveying belts 13 and 14 of the wire conveying device 12, and is fed into the wire collection box 15.

A first wire guide 10 is formed by fixing a rod-like pipe to the free end (connection end) of the wire electrode 7 supplied from the wire electrode supply device 6 and guiding the wire electrode 7 with this pipe. In order to ensure that the wire electrode 7 is inserted into the processing start hole 9c and the second wire guide 11, an automatic setting device 8 is used.
is a pipe 2 for guiding the wire electrode 7;
A holder 22 that can hold a plurality of 1.
The pipes 21 are taken out one by one from the holder 22, and the wire electrode supply device 6 and the first wire guide 1 are removed.
0, and a pipe take-out device 23 disposed on the wire electrode passage between the pipe and the wire electrode. Pipe extraction device 2
The pipe 21 is located near the end 21a of the pipe 21 taken out by the wire electrode supply device 6 side.
A connecting device 24 for connecting a part of the wire electrode 7 is provided.

The coupling device 24 includes an arm 26 that moves forward and backward along its axial direction by a solenoid 25, and a pipe 2.
It consists of an arm 26 and a fixed block 27 disposed opposite to each other via the control unit C/U, and when the solenoid 25 is energized by the control unit C/U, the arm 26
moves towards the fixed block 27, and the pipe 21
It is configured to crush the end portion 21a of. A guide member 70 for guiding the wire electrode 7 supplied from the wire electrode supply device 6 into the hollow portion of the pipe 21 is disposed above the end portion 21a of the pipe 21 taken out by the pipe takeout device 23. ing. This guide member 70 has a guide hole 70a in which the entrance side of the wire electrode 7 has a large diameter and the exit side has a small diameter. The free end of the wire electrode 7 is reliably connected to the end 21 of the pipe 21 when it is paid out by the rollers 5, 5.
It is sent into the hollow part of a. Control unit C/
U indicates that the solenoid 25 is activated at the timing when the free end of the wire electrode 7 is sent into the hollow part of the pipe 21.
energizes to crush the end 21a of the pipe 21,
Thereby, the pipe 21 and the wire electrode 7 can be fixed together. The wire cutting device 60 is composed of a cutter 61 and an actuator 62 that drives the cutter 61. The actuator 62 is actuated by a signal from the control unit C/U.
When activated, the wire electrode 7 protruding from the lower end of the guide member 70 is cut by the cutter 61.

The pipe take-out device 23 includes a pipe gripping section 28 for gripping and holding the pipe 21, and an actuator section 29 for moving the pipe gripping section 28 and performing pipe gripping operations. The actuator section 29 operates in response to a signal from the control unit C/U, advances the pipe gripping section 28 to approach the holder 22, takes out only one pipe 21, and grips the taken out pipe 21. At the same time, the pipe gripping section 28 is moved back to position the pipe 21 on the path of the wire electrode 7. The gripping operation of the pipe 21 by the pipe gripping section 28 is performed by the connecting device 2.
4, the connection between the pipe 21 and the wire electrode 7 is released, and as the wire electrode 7 is sent out by a pair of wire delivery rollers 5, 5, the pipe 21 is sent downward, and the pipe gripping part 28 is moved downward. A pair of drive rollers 30, 3 arranged below
0 to the first wire guide 10.

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

As shown in FIG. 2, the fixed guide member 35,
36 has a notch 3 for guiding the wire electrode 7.
5a and 36a 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 respective notches 35a and 36b of the fixed guide members 35 and 36,
The wire electrode 7 can be guided by the notch 37b formed in the movement guide member 37. On the other hand, when the movement guide member 37 is moved backward in the direction of arrow B by the actuator 38 and reaches the position shown by the solid line, the notches 35a, 36a and 37a
The area of the guide path formed by this increases, and the area becomes sufficient for the pipe 21 to pass through. That is, by adjusting the position of the movement guide member 37 using the actuator 38, the first wire guide 10 can be placed in at least a first state in which the pipe 21 can pass through, and a second state in which the wire electrode 7 is guided. It is possible to realize the following state.

The second wire guide 11 also has exactly the same configuration as the first wire guide 10 described above, and accordingly, corresponding parts are given the same reference numerals and explanation thereof will be omitted.

First and second wire guides 1 in the first state
0, 11 and the pipe 21 sent out through the processing start hole 9c enters the wire conveyance device 12, is sandwiched between conveyor belts 13 and 14, and is conveyed into a wire collection box 15.

Next, the structure of the holder 22 and the pipe take-out device 23 will be explained in detail with reference to FIG. Holder 22
has a substantially L-shaped pipe holder 41, and the pipe holder 41 is attached to the main body block 43 by a hinge pin 42.
is hinged. The main body block 43 and the hinge pin 42 are firmly fixed to a frame (not shown), and the pipe presser 41 is attached to the presser spring 4.
4 toward the main body block 43. The structure is such that a plurality of pipes 21 are held between the pipe holder 41 and the main body block 43 by the spring biasing force of the pipe holder 41 against the main body block 43. In order to prevent these clamped pipes 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 pipe retainer 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 a stop plate 46 is held in place by a stop spring 47 (see FIG. 4) disposed between the stop plate 46 and the pipe holder 41. 41 and is biased by a spring. The spring force of the retaining spring 47 is such that the pipe holder 41 holds the pipe 2 as shown in FIG.
1, the stop plate 46
is set so that it is in close contact with the pipe holder 41.

On the other hand, the pipe take-out device 23 has a slider 51
and the hinge pin 5 fixed to the slider 51.
2 and a pair of jaws 54, 5 for housing the pipe 21 at its free end.
A movable intake holder 53 having a pipe gripping portion 28 formed therein. The actuator section 29 includes a first actuator 29a for moving the slider 51 in the directions of arrows C and D, and a second actuator 29b for opening and closing the movable intake holder 53. The first actuator 29a is fixed to a frame (not shown), and the slider 51, which is connected to the first actuator 29a by an arm 55, is moved in the directions of arrows C and D along a guide rail (not shown) by the first actuator 29a. This allows the pipe 22 to be taken out from the holder 22 and held, and the taken out pipe to be positioned at a predetermined position.

4a to 4d, the pipe removal device 2
3 illustrates the operation of taking out only one pipe 21 from the holder 22. To explain the operation of taking out the pipe with reference to FIGS. 3 and 4, first, the movable intake holder 53 is opened by the second actuator 29b (FIG. 4a), and then the first
The actuator 29a moves the slider 51 in the direction of arrow C.
When the notch 51a formed in the portion of the slider 51 facing the holder 22 comes into a predetermined fit with the main body block 43 (FIG. 4e), the second actuator 29b is activated. The movable intake holder 53 is closed, and the pair of jaws 5
4, 54 and the slider 51, the outermost pipe 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, although the pipe retainer 41 is opened due to the action of the stop plate 46 and the stop spring 47, the remaining three pipes are held against the main body block 43 by the stop plate 46. These pipes are therefore held tightly (see Figure 4c).
At this time, the remaining three pipes are pushed outward by the feed spring 48, so when the pipe holder 41 is closed again, the pipe 21 is in the fourth position.
In the figure, it is moved towards the right hand side, and is 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 driving of the motor M is stopped and the wire cutting device 60 is activated to cut the wire electrode 7. will be carried out. Next, the pipe take-out device 23 is activated,
The pipe 21 is taken out from the holder 22, and the taken out pipe 21 is positioned at the position shown in FIG. As a result, the end 21a of the pipe 21 and the connection end of the wire electrode 7 face each other, and when the motor M is driven again, the connection end of the wire electrode 7 is brought into contact with the pipe 2.
The motor M is stopped when the motor M has fully entered the hollow portion of the end portion 21a of the motor M. Next, the coupling device 24
is activated, the end portion 21a of the pipe 21 is crushed, and the pipe 21 and the wire electrode 7 are fixed together.

When the connection work between the pipe 21 and the wire electrode 7 is completed in this way, the second actuator 29b
is operated to release the clamping state of the pipe 21 by the pipe gripping section 28, and the motor M is driven again to feed the pipe 21 toward the workpiece 9.
At this time, the first and second wire guides 10, 11
are in the first state, therefore, the pipe 21 is connected to the first wire guide 10 and the processing start hole 9.
c. The wire is sent to the wire conveying device 12 through the second wire guide 11. In this way, the wire electrode 7 is guided through the pipe 21 having the required rigidity and inserted into the wire guide and the processing start hole, so problems such as buckling do not occur at all, and the wire electrode 7 can be moved with high reliability. Automatic setting can be performed.

(Effects) According to the present invention, as described above, a cylindrical body having a required rigidity is connected to a wire electrode, and a part of this cylindrical body is crushed, thereby fixing the cylindrical body and the wire electrode. However, since the wire electrode is automatically set by pulling the wire electrode with a cylindrical body fixed to the wire electrode, automatic setting of the wire electrode is reliably performed even in the case of an extremely small diameter wire electrode. be able to.

In addition, the cylindrical body and the wire electrode can be fixed together by simply inserting the wire electrode into the cylindrical body and crushing a part of the cylindrical body, so the connection can be easily accomplished in an extremely short time. This has a special effect in that the time required for automatic setting is extremely short.

[Brief explanation of the drawing]

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. The enlarged perspective views of FIGS. 4a to 4d are operational explanatory diagrams for explaining the operation of taking out the pipe from the holder by the pipe taking out device. DESCRIPTION OF SYMBOLS 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...Pipe take-out device, 24...Connection device.

Claims (1)

[Claims] 1. A wire-cut electric discharge machining device for automatically inserting 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 the automatic wire electrode setting method, the free end of the wire electrode is inserted into a cylindrical body having at least the rigidity necessary for the wire setting operation, and then a part of the cylindrical body is crushed. A wire cut characterized in that a wire electrode is fixed to the cylindrical body, and then the wire electrode is pulled by the cylindrical body to insert the wire electrode into the processing starting hole and the pair of wire guides. Automatic wire electrode setting method for electrical discharge machining equipment. 2. A pair of wires configured such that the wire electrode supplied from the supply reel can be inserted into the processing start hole of the workpiece and a necessary member provided near the workpiece for guiding the wire electrode. A holder for holding at least one cylindrical body having at least the rigidity necessary for a wire setting operation, in an automatic wire electrode setting device for a wire cut electrical discharge machining apparatus for automatically inserting a wire into a guide;
a take-out device that takes out a cylindrical body from the holder prior to setting the wire electrode and places the cylindrical body on a wire electrode path between the wire electrode supply device and one of the pair of wire guides; After the free end of the wire electrode is inserted into the cylindrical body placed by the extraction device, the wire electrode is fixed to the cylindrical body by crushing a part of the cylindrical body. a connecting device; a feeding device for feeding the cylindrical body connected to the wire electrode along a predetermined wire electrode insertion path passing through the wire guide and the machining start hole of the workpiece; a control device for setting the wire guide in a state in which the cylindrical body can penetrate when a required feeding operation of the cylindrical body is performed;
An automatic wire electrode setting device for a wire cut electrical discharge machining apparatus, characterized in that the wire electrode is automatically set by pulling the wire electrode by the cylindrical body.