JPH0729246B2 - Wire electrode setting device for wire cut electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is capable of reliably setting a wire electrode in a wire-cut electric discharge machine, and particularly automatically sets a wire electrode having a small diameter. The present invention relates to a wire electrode setting device suitable for carrying out the method.

(Prior Art) Conventionally, various devices have been proposed in which a wire electrode can be automatically set in a wire-cut electric discharge machine, but the most problematic point in automatic wire-electrode setting is The point is how to prevent the buckling of the wire electrode during the insertion work when the diameter of the wire electrode is small. In order to solve this problem, for example, the tip of the wire electrode is annealed to straighten the wire electrode so that the wire electrode can smoothly pass through the guide, and a guide pipe is prepared. A device for guiding the wire electrode to the processing start hole so that the wire electrode can be surely inserted into the processing start hole (for example, refer to Japanese Patent Laid-Open No. 59-205229). There has been proposed a device or the like in which a wire is fed into a guide by a jet jet.

(Problems to be solved by the invention) The devices and are effective when the wire electrode has a certain degree of rigidity, but when the diameter of the wire electrode is extremely small, the wire electrode is used as a wire guide during feeding. There is a problem in that even a slight contact causes buckling, the straightness cannot be maintained, and it becomes impossible to insert the wire guide. On the other hand, the device (1) cannot expect the insertion action by the jet jet when the processing start hole of the work piece has a small diameter, and especially when the wire electrode is set in water or oil, the jet jet is used. Since the force is significantly weakened, there is a problem in that the wire cannot be set.

Therefore, an object of the present invention is to provide a wire electrode setting device for a wire cut electric discharge machine which is suitable for surely performing automatic setting of a wire electrode having an extremely small diameter.

(Means for Solving the Problems) A feature of the present invention for achieving the above object is to provide a wire electrode supply device for supplying a wire electrode, and an openable / closable guide for guiding the wire electrode supplied from the wire electrode supply device. Wire having a first wire guide configured as described above, a second wire guide arranged to face the first wire guide, and a take-out device for taking out the wire electrode taken out through the second wire guide. In a wire electrode setting device for a cut electric discharge machine, a straight cylindrical body having an inlet end and an outlet end of the wire electrode and arranged so as to be axially parallel to a planned trajectory of the wire electrode, A guide body in which the inlet end is provided in alignment with the planned passage path, and the diameter of the outlet end is sufficiently larger than the diameter of the inlet end, and the first wire guide. When in the open state, the outlet end is at least between the inlet side of the first wire guide and the outlet side of the first wire guide while maintaining a required axis parallel state between the planned passage locus and the guide body. A support guide member for supporting and guiding the guide body so as to be movable, and a drive member for moving the guide body,
Liquid is supplied at a required pressure from the vicinity of the inlet end so that the connecting end of the wire electrode inserted into the inlet end moves straight toward the drawing device, and the liquid is supplied from the inlet end to the outlet in the guide body. And a liquid supply means for passing the liquid in a rectified state toward the end.

(Operation) The wire electrode is positioned and guided by the entrance end of the guide body provided in line with the expected trajectory of the wire electrode at a position substantially corresponding to the predetermined trajectory of passage there.
The pressurized liquid supplied from the vicinity of the inlet end of the guide body by the liquid supply means flows in a rectified state from the inlet end side toward the outlet end side due to the diameter difference between the inlet end and the outlet end. As a result, the wire electrode inserted in the guide body is provided with straightness, the pressurized liquid supplied into the guide body is positioned on the trajectory of the passage plan, and the wire electrode is expected to pass through the guide body. You can go straight along the trajectory.

(Embodiment) FIG. 1 is a schematic diagram showing a wire electrode traveling system of a wire cut electric discharge machine equipped with a wire electrode setting apparatus 1 according to the present invention. A wire electrode 7 is fed from a wire electrode supply device 6 composed of a wire electrode bobbin 2, a wire guide 4 and a pair of wire delivery rollers 5, 5 driven by a motor M ₁ , and the wire electrode 7 is an automatic setting device described later. 8, the first wire guide 10 disposed on the upper surface 9a side of the workpiece 9 and the processing start hole 9 of the workpiece 9
c and the wire transfer device 12 guided to be inserted into the second wire guide 11 arranged on the lower surface 9b side of the workpiece 9.
Then, the wire is caught between the transfer belts 13 and 14 of the wire transfer device 12 and taken into the wire recovery box 15.

By leading the free end (connection end) of the wire electrode 7 supplied from the wire electrode supply device 6, the wire electrode is surely inserted into the first wire guide 10, the processing start hole 9c and the second wire guide 11. In order to make the automatic setting device 8
A guide body 21 for leading the wire electrode 7 is provided. The guide body 21 is an inlet end for inserting the wire electrode 7.
It is a tubular body having 22 and an outlet end 23 for taking it out, and is arranged so that its axis is coaxial with the planned trajectory of the wire electrode 7. In order to support and guide the guide body 21 so that the guide body 21 can move in the axial direction while maintaining this coaxial state, a support guide member 24 is arranged above the first wire guide 10. The guide body 21 is guided by the guide hole 25 of the support guide member 24 and can move up and down along the path of passage of the wire electrode 7. In order to move the guide body 21 up and down, a pair of drive rollers 26, 26 driven by the motor M ₂ are provided near the support guide member 24, whereby the guide body 21 is defined by the lower stopper 27. It is possible to move from the lowermost position shown in the figure to the uppermost position (see FIG. 2) defined by the upper stopper 28.

A chamber 29 is formed at the upper end of the guide body 21.
29 is connected to a fluid pressure supply source 31 by a flexible pipe 30, the pressurized processing liquid supplied from the fluid pressure supply source 31 is supplied into the chamber 29, and the supplied pressure processing is performed. The liquid is configured to move downward in the hollow portion 21a of the guide body 21 as a jet jet. In addition, as already explained,
When the wire electrode 7 supplied from the wire electrode supply device 6 is provided with straightness by being supplied with a pressurized liquid, the connecting end of the wire electrode 7 is prevented from coming into contact with the inner wall of the guide body 21. You can go straight through 21. This effect becomes more remarkable as the diameter of the wire electrode becomes smaller.

Even after the wire electrode 7 is sent out from the guide body 21 and goes out of the guide body 21, the wire electrode 7 is positioned on the required passing trajectory and draws the electrode because of the pressurized liquid discharged from the guide body 21. Go straight towards the device for. Therefore, the guide body 21 does not necessarily have to move so that its outlet end reaches the vicinity of the inlet of the wire transfer device 12. Therefore, the end of the wire electrode 7 inserted from the inlet end 22 does not buckle due to this jet jet and is guided by the guide body 21.
Will be guided downwards along. In the illustrated embodiment, the chamber
The lower surface of 29 contacts the lower stopper 27 to define the lower limit position of the guide body 21, and the upper surface of the chamber 29 contacts the upper stopper 28 to define the upper limit position of the guide body 21. The exit end 23 of the guide body 21 when the body 21 is moved downwards
Is slightly protruded from the lower end surface of the second wire guide 11 as shown in FIG. 1, while the outlet end 23 of the guide body 21 moves when the guide body 21 moves to the uppermost position.
It is configured so as to come out from the upper end surface of the (see FIG. 2).

Reference numeral 40 denotes a wire cutting device including a cutter 41 and an actuator 42 that drives the cutter 41. The actuator 42 is operated by a signal from the control unit C / U.
Is operated, the wire electrode 7 protruding from the lower end of the support guide member 24 is cut by the cutter 41. Wire electrode 7
It can be detected by the wire sensor 45 provided in the vicinity of the lower end of the support guide member 24 whether or not the protrusion is coming out from the lower end of the support guide member 24.

In the first wire guide 10, insertion holes 51, 52 for passing the guide body 21 and the wire electrode 7 are formed vertically, and a machining liquid supply hole 53 for supplying a machining liquid is formed on a side surface thereof. It has a casing 54. Inside the casing 54, a first movable portion 56 is moved forward and backward by a first actuator 55 in a direction perpendicular to the traveling direction of the wire electrode 7, and a second actuator 57 is moved forward and backward in a direction perpendicular to the traveling direction of the wire electrode 7. And a second movable part 58 capable of forming a wire guide in cooperation with the first movable part 56. The first and second actuators 55 and 57 are control units C / U
When the guide body 21 is inserted into the first wire guide 10 by being driven by, the first and second movable parts 56, 58 are retracted so as to be separated from each other, and the guide body 21 can pass therethrough. On the other hand, when the wire electrode 7 is guided, the first and second movable parts 56, 58 are advanced by the respective actuators to form a guide for guiding the wire electrode 7. It is said that.

FIG. 3 shows the configuration of the first and second movable bodies 56 and 58 in detail. In the first movable body 56, the upper side in which the V groove 71 is formed is the id portion 72, and the V-shaped groove is formed so that the width of the lower groove is approximately equal to the size of the wire electrode 7. It has a lower guide portion 74 in which a guide groove 73 is formed, while
The second movable body 58 has a guide portion 75 corresponding to the lower guide portion 74.
And an energization block 76. In the guide part 75,
A guide groove 77 corresponding to the guide groove 73 formed in the lower guide portion 74 is formed, and the first and second actuators 5
When the first movable portion 56 and the second movable portion 58 are brought into contact with each other by 5,57, the lower guide portion 74 comes into contact with the id portion 75 as shown in FIG. A guide hole 78 for guiding the is formed. Therefore, in this state, the wire electrode 7 is guided by the V groove 72 of the upper guide portion 72 and is guided through the guide hole 78 while being in contact with the current-carrying block 76 and supplied from the machining liquid supply hole 53. The machining fluid to be discharged flows downward from the insertion hole 52 formed in the casing 54,
It is supplied to the processed portion of the work piece 9.

FIG. 5 shows the first and second actuators 55, 57 for the first
The second movable portions 56 and 58 are separated from each other, and the second movable portions 56 and 58 are in the first state in which the guide body 21 can be passed therethrough.

The second wire guide 11 has exactly the same configuration as the first wire guide 10 described above, and therefore, in the respective drawings, corresponding parts are designated by the same reference numerals and the description thereof is omitted.

Next, the operation of the wire electrode automatic setting device 1 will be described with reference to FIGS. 1 and 2. When the processing is completed and the wire electrode 7 fed from the wire electrode supply device 6 is continued to the next point, the guide body 21 is at the position shown in FIG. 2, and in this state, the actuator 42 causes the control unit C /
Driven by U, the wire electrode 7 is cut at the lower end of the support guide 24.

The cut end of the wire electrode 7 is attached to the first and second wire guides 1
The first and second actuators 55, 57 of the first and second wire guides 10, 11 are driven by the control unit C / U to be inserted into the machining start holes 9c of the workpiece 0, 11 and 0, respectively. The first and second wire guides 10 and 11 are in the first state, respectively.
After this, the motor M ₂ is driven by the control unit C / U,
The guide body 21 is moved downward by the feed rollers 26, 26, and the state shown in FIG. 2 is changed to the state shown in FIG. Thereafter, the motor M ₁ is driven by the control unit C / U to rotate the wire feed rollers 5 and 5, and the wire electrode 7 is fed downward, and at the same time, the pressurized working fluid is supplied from the fluid pressure supply source 31. Get started. As a result, the machining liquid jet jet vigorously flows in the hollow portion 21a of the guide body 21, and the wire electrode 7 is not buckled by the force of this jet flow and its outlet end 23
Reach up to. Since the wire conveying device 12 is arranged immediately below the outlet end 23, the connecting end portion of the wire electrode 7 fed from the outlet end 23 is reliably taken out by the wire conveying device 12 and the wire electrode 7 Setting is completed.

Thereafter, the guide body 21 is pulled upward by the feed rollers 26, 26, and when it reaches the position shown in FIG. 2, the control unit C / U causes the first and second wire guides 10, 11 to move.
Is in the second state (see FIG. 4), the wire electrode 7 is firmly guided above and below the workpiece 9 by the first and second wire guides 10 and 11, and the wire electrode 7 is energized. Is also done.

In the above embodiment, when the wire electrode 7 is inserted by the guide body 21, the guide body 21 is lowered until the outlet end 23 of the guide body 21 projects from the lower end surface of the second wire guide 11. However, the outlet end 23 of the guide body 21 has the first wire guide 10
The effect can be sufficiently obtained by simply lowering to the level of the lower end surface of. That is, due to the momentum when the wire electrode 7 smoothly passes through the first wire guide 10 due to the use of the guide body 21 and the jet flow flowing through the guide body 21, the wire electrode 7 becomes the machining start hole 9c and the second wire guide. This is because they can pass 11 smoothly without buckling.

Further, the pressurized liquid to be supplied to the guide body 21 is not limited to the pressurized processing liquid, and other suitable liquid may be used.

(Effects) According to the present invention, the wire electrode inserted into the inlet end of the guide body is substantially positioned on the expected trajectory of the passage at the inlet end, and is supplied from the liquid supply means to be rectified in the guide body. The pressurized liquid imparts straightness to the wire electrode in the guide body. As a result, due to the pressurized liquid supplied into the guide body, the wire electrode is guided along the predetermined trajectory of the guide body so that the tip portion of the wire electrode does not come into contact with the inner wall of the guide body and moves straight. Of course,
The wire electrode can move on a required passage trajectory by the rectified pressurized liquid even after leaving the guide body. Therefore, the wire electrode can be set on the predetermined trajectory, and the wire electrode can be reliably fed into the predetermined wire guide portion of the wire guide. This action becomes more remarkable as the diameter of the wire electrode becomes smaller, and therefore, there is an excellent effect that a wire electrode having a particularly small diameter can be set smoothly and surely.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing a state where a guide body of the apparatus shown in FIG. 1 is moved upward, and FIG. 3 is FIG. 4 is an enlarged perspective view of the wire guide shown in FIG. 4, FIG. 4 is a sectional view of the wire guide shown in FIG. 3 in the second state, and FIG. 5 is a wire guide shown in FIG. 3 in the first state. FIG. 1 ... Wire electrode setting device, 6 ... Wire electrode supplying device, 8 ... Automatic setting device, 9 ... Workpiece, 10 ... First wire guide, 11 ... Second wire guide, 12 ... Wire Conveyor device, 21 ... Guide body, 22 ... Entrance end, 23 ... Exit end, 24 ... Support guide member, 26 ... Drive roller, 29 ...
Chamber, 31 ... Fluid pressure source.

Claims (1)

[Claims] 1. A wire electrode supply device for supplying a wire electrode, a first wire guide configured to open and close for guiding a wire electrode supplied from the wire electrode supply device, and a first wire guide facing the first wire guide. A wire electrode setting device for a wire-cut electric discharge machine, comprising: a second wire guide that is arranged in a line; and a take-out device that takes out the wire electrode taken out through the second wire guide, the inlet end of the wire electrode And a straight tubular body having an exit end and arranged to be axially parallel to the expected trajectory of the wire electrode, the inlet end being provided in alignment with the expected trajectory, and A guide body whose diameter at the outlet end is sufficiently larger than the diameter at the inlet end, and a required passage between the guide path and the guide body when the first wire guide is in an open state. A support guide member for supporting and guiding the guide body so that the outlet end can move at least between the inlet side of the first wire guide and the outlet side of the first wire guide while maintaining the parallel state; And a drive member for moving the connection end portion of the wire electrode inserted in the inlet end to supply liquid at a required pressure from the vicinity of the inlet end so as to move straight toward the drawing device, And a liquid supply unit for passing the liquid in a rectified state from the inlet end to the outlet end in a guide body.