JPS5856732A - Automatic wire connector for wire cut discharge working machine - Google Patents

Abstract

PURPOSE:To connect a wire electrode reliably by employing a double guide pipe for guiding a electrode wire while providing a slotting in each of said pipes and constructing such that they are rotated relatively to open/close said slotting. CONSTITUTION:A guide pipe 125 is reliably subieeted to insertion of the wire electrode under the condition where slotting 125a, of an inner pipe 125a is shifted from the slotting 125b1 of an outer pipe 125b and closed. After completion of connection of the wire electrode, a slide lever 114 is slided to rotate the first disc 125 to the left by means of a pin 125c3 to be engaged with an engaging section 114b, thus to function such that the slotting 125a1 of the inner pipe 125a and the slotting 125 of the outer pipe 125b are matched and to move a wire insertion head thus to remove the wire electrode from the guide pipe 125. Consequently the guide pipe 125 can be formed quite thin and the wire electrode can be connected reliably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a wire-cut electric discharge machine for cutting the wire in order to continue cutting at other workpiece parts after finishing cutting at the - workpiece part. The present invention relates to an automatic wire connecting device for reinserting an electrode into a workpiece and a lower die.

In cutting a workpiece using a wire-cut electric discharge machine, when moving from a - workpiece part to another workpiece part, the wire electrode is cut and the cutting process provided at the new workpiece part is started. The wire electrode must be inserted into the hole (hereinafter referred to as the initial hole) or the set position and the lower die, and the wire electrode must be resupplied and reconnected.

Conventionally, in order to automatically supply and connect the wire electrode as described above, the outer diameter of the upper die is formed to be thin, and this is inserted into the initial hole, and the wire electrode is guided and connected. However, since the upper die part cannot be formed very thin, the diameter of the initial hole that is first formed in the workpiece must be increased, and it is difficult to process the initial hole. There are disadvantages in that a lot of time and money are spent, and there are also limitations in the shape or size of the process.

In view of the above-mentioned drawbacks, the present invention comprises a guide pipe for guiding the wire electrode to the initial hole of the workpiece, consisting of double pipes each having a slit, and when guiding the wire electrode, the pipes are moved relative to each other. The guide pipe was rotated 2 to shift the position of each slit to guide the wire electrode, and when the connection of the wire electrodes was completed, the slicks were brought into alignment and the guide pipe was retracted from the conducting path of the wire electrode. Therefore, it is an object of the present invention to provide an automatic wire connecting device that can reduce the diameter of the guide pipe and reliably insert and connect the wire.

Hereinafter, one embodiment using the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram illustrating the main parts of a wire cassette electric discharge machine using the present invention in a state in which a workpiece is being cut. 1 is an arm fixed to a column upright on a base (not shown) of the electric discharge machine main body; 2 is a slide shaft supported at the tip of the arm 1 so as to be able to slide vertically; 3
is a processing head fixed to the lower end of the slide shaft 2. 4 is an initial hole 4a for starting the cutting process
A workpiece 5 is placed on which the workpiece 4 is formed,
The table is movable both vertically and laterally and is automatically driven by a control system (not shown) to cut into predetermined shapes. 6 is a wire electrode made of a brass wire; 7 is rotatably supported on the arm 1 to guide the wire electrode 6; 8 and 9 are first guide rollers that guide the wire; A supply roller and a pinch roller that pinch and feed the electrode 6; 10 is the wire electrode 6;
is guided to the processing head 3 (second guide roller).

11 is fixed to the processing head 3, and the wire electrode 6
12 is a lower current-carrying electrode disposed below the table 5; 13 and 14 are respective holes into which the wire electrode 6 is inserted; positioning of the wire electrode 6 is performed during cutting; The upper die and the lower die.

Reference numerals 15 and 16 designate a pair of guide belts for running the wire electrode 6 while applying tension therebetween. 17 is a wire insertion head that cuts the wire electrode 6, guides it, and inserts it into the initial hole 4a and the lower die 14, and 18 and 19 are the wire insertion heads 1, respectively.
A guide shaft 7 is fixed to the guide shaft 7, and 20 is a supporting member that supports the guide shaft 18, 19 so as to be slidable in the vertical direction, and is supported so as to be slidable in the horizontal direction with respect to the arm 1, and a control device (not shown) is supported. The wire insertion head 1
7 can be driven vertically and horizontally with respect to the arm 1.

FIG. 2 is a perspective view showing the main structure of the wire insertion head 17 described above, FIG. 3 is an explanatory diagram of its operation, FIG. 4 is an enlarged perspective view, and FIG. 5 is a partially cutaway view of FIG. 4. FIG. In these drawings, there are feed rollers 101 and 102 that can rotate while sandwiching the wire electrode 6, and the feed roller 101 is connected to a roller drive unit 103.
The feed roller 102 is pivotally fixed to one end of a roller swinging lever 104, and wire positioning plates 104a are arranged above and below the feed roller 102 at one end of the roller swinging lever 104. and the roller swing lever 1
04 is connected to a jid 106 via a compression spring 105, and the jid 106 is coupled to an electromagnetic plunger 107. 108 has one end connected to the roller swinging lever 1.
The first link connected to the point between 04, Φ → mock--109 is the first link p t o g *
A second link 110 is swingably attached to the other end of the blade and extends around the fulcrum 109a, and - the wire electrode 6 is attached to the blade end in cooperation with the wire positioning plate 104a. A substantially triangular notch 110 that holds the
111 is a roller swing motor, 112 is a gear train, 113 is a swing drive cam fixed to the gear 112a of the gear train 112, and 114 is a wire positioning piece formed at one end of the swing drive cam 113. A contact end 114a is provided, and the second link 109 and the wire positioning piece 110
A retaining portion 114b is formed at the other end, and a slide lever is slidably attached and is biased in the direction of the swing drive cam 113 by a spring (not shown). . The feed roller 101
, 102 are in pressure contact with the slide lever 11 that follows the swing drive cam 113, or can be released.

115 is made of an insulating material and has vertical grooves 115a formed therein, and 116 is the cutter portion holding member 115;
The cutter electrode 116 includes a first electrode 116a, a second electrode 116b, and an insulating material 116C sandwiched between them. A vertical groove 116d is formed continuously in each of these, and the cutter holding member 1
15 and cutter electrode 116#t, each is attached so as to be slidable in the longitudinal direction. 117 is one end 11
7a is a connecting lever that engages with the longitudinal groove 115a of the cutter holding member 115 and is swingably attached; 118, one end 118a is connected to the other end 117b of the connecting lever 117;
The cutter clamping unit engages with and is swingably mounted.
1119 is a cutter electrode lever whose one end 119a engages with the vertical groove 116d of the cutter electrode 116 and is swingably attached; 120 is the cutter holding lever 118;
The other end 118b of the cutter electrode lever 119 is engaged with the other end 119b of the cutter electrode lever 119, and the cutter actuating lever is attached to be slidable in the left and right direction, forming a cam actuating part tσψ.

121 is a locking lever whose one end 121a is rotatably attached to the slide lever 114 and swingably supported by a pin 121b at the other end; 122 is the locking lever 1;
A tension spring is applied between the pin 121b at the other end to which the cutter 21 is locked and the other end 118b of the cutter holding lever 118, biasing the cutter actuating lever 120 to the left. 123 is the four-ra drive unit 1
A first helical gear fixed to the output shaft 103a of 03,
Reference numeral 124 designates a WE2 helical gear to which a cam portion 124a that cooperates with the cam actuating portion 120a of the cutter actuating lever 120 is integrally fixed to one end, and includes the first helical gear 123 and the second helical gear 124. This constitutes a screw gear mechanism. 125, as shown in FIG. 5, inner pipes 125a each forming a slit IJ125al;
The guide pipe is composed of an outer pipe 125b having a slot 125b1 formed therein, and has a notch 1 at its upper end that communicates with the slot 125al+125b, respectively.
25cl.

A first disc 125c and a second disc 125d, each having a shape of 125d, are fixed to each other and are attached so as to be rotatable relative to each other. The first disc 125c has an arcuate groove 125cg and a pin 125e that protrudes downward and engages with the engagement portion 114b of the slide lever 114.
fi is formed, and the second circular plate 125d has a pin 125 d that fits into a circular arc groove 125 el formed in the first circular plate 125C; a hard pin 125 of the first circular plate 125C; A circular arc groove (not shown) is formed into which the slide lever 114 is fitted, and the pin 125 cH can rotate the first disc 125c and the inner pipe 125a fixed thereto by operating the slide lever 114. ing.

Reference numeral 126 denotes a reinforcing arm of the guide pipe 125, which is attached to a plate that can slide along the guide pipe 125.

Next, the operation will be explained. When performing normal cutting, the wire insertion head 17 is
is in a retracted position where it has been moved upward and to the left/direction, and the processing head 3 is lowered to a position close to the workpiece 4, and while running the wire electrode 6, the processing head 3 moves between the wire electrode 6 and the workpiece 4. The workpiece 4 is cut by electrical discharge.

When the cutting process at the workpiece part - is finished and the cutting process is to be continued at the other workpiece part, the following operations are performed according to a predetermined sequence by a control device (not shown). As shown in FIG. 6, the processing head 3 rises, and as the wire insertion head 17 descends, it moves to the right and stops when the wire electrode 6 reaches the center of the cutter portion shown in FIG. At this time, as shown in FIGS. 2 and 3, the cutter portion of the wire insertion rod 17 is rotated by the roller drive motor 103 to rotate the second helical gear 124, and the cutter portion drive lever 120 is moved by the tension spring by the cam portion 124a. It is located at a position where it has slid to the right against 122. The cutter part holding member 115 is at the position where it has been slid to the right by the connecting lever 117 and the cutter part holding member ζ-118, and the cutter part electrode 116 is at the position where it has been slid to the left by the cutter part electrode lever 119. section is open. In addition, the feed roller 102 and the wire positioning piece 1
10, as shown in FIGS. 7 and 8, the slide lever 114 is in a downwardly slid position by the swing drive cam 113, and the roller swings through the second link 109 and the first link 108. The lever 104 is swung in the clockwise rotation direction, and the feed jill 2102 is separated from the feed 4-2101, and the wire positioning piece 110 is also in a position rotated in the counterclockwise rotation direction.

When the control device (not shown) starts the clamping operation of the cutter portion, the p-ra drive motor 103 rotates, rotates the cam portion 124a of the second helical gear 124 via the screw gear mechanism, and operates the cutter portion. 7 (-120 is tension spring 12
2, the cutter part holding lever 118 slides to the left following the cam part 124a and engages the cutter part operating lever 120 at the other end 118b, and the other fil 19b.
The cutter part electrode levers 119 that are engaged with each other are rotated to the left, and the cutter part holding member 115 is slid to the left via the connecting lever 117 that is engaged with the vertical groove 115a, and at the same time, the cutter part electrode 116 is moved in the vertical groove 116d. It is slid to the right by the engaged cutter electrode lever 119, and is held in a state where tension is applied to the wire electrode 6. The upper current-carrying electrode 1 is attached to the wire electrode 6 held in the cutter part.
1 and the first electrode 116a of the cutter part electrode 116 to heat it, annealing the wire electrode 6 between them to shape the wire electrode into a straight line, and then Electricity is applied between the electrode 116a and the second electrode 116b to heat it, and the wire electrode 6 is broken by the tension applied in advance.

When the wire electrode 6 is cut, the roller drive motor 103 rotates, and the cutter part operating lever 1
20 to the right, and press the cutter operation lever 1.
Slide the cutter part holding member 115 to the right via the cutter part holding lever 118 and connection lever 117 interlocked with the wire electrode 20, slide the cutter part electrode 116 to the left via the cutter part electrode lever 119, and remove the wire electrode. 6
Release the clamping in the cutter section.

The wire insertion head 17, which has released the clamping of the wire electrode 6, moves further to the right from the position shown in FIG. 6, as shown in FIG.
It stops at a position between 02 and 02. The roller swing motor 111 is rotated by a control device (not shown),
The swing drive cam 113 interlocked with this rotates, and the slide lever 114 that cooperates with the swing drive cam 113 is slid upward following the swing drive cam 113 by a spring (not shown), as shown in FIG. Or, as shown in FIG. 4, the cutter operation lever 120 is
The second link 10 locks the leftward slide of the
9 and the roller swing lever 1 via the first link 108
04 in the counterclockwise rotation direction, and the wire positioning piece 110 is also rotated in the clockwise rotation direction to connect the wire electrode 6 to the wire conduction path between the wire positioning plate 104a and the notch 110a of the wire positioning piece 110. At the same time, the rod 106 is loosely sandwiched between the feed rollers 101 and 102, and the electromagnetic plunger 107 operates to attract the rod 106 upward, and the roller swing lever 104 is strongly rotated to the left via the compression spring 105. , and the feed roller 10'+102 strongly clamps the wire electrode 6.

When the roller drive motor 103 is rotated, the wire electrode 6 is fed out by the feed rollers 101 and 102, and the wire electrode is connected to the guide pipe 12.
5 is inserted. At this time, the guide pipe 12
5 is a slide lever 1 as shown in FIGS. 4 and 5.
14 is moving upward to the right, the first disk 125c that engages with the engaging portion 114b and the pin 125c is rotated clockwise, and as shown in FIG. Suriori 125 at and outer pipe 125b Suriuri 1
25 b.

The position of the wire electrode 6 is different and the wire electrode 6 is in a closed state.
can be inserted into the guide pipe 125 reliably.

After the wire electrode 6 has been inserted into the guide pipe 125, the wire insertion head 17 moves the wire electrode 6 downward as shown in FIG. 4a to reach the lower die 14, and the wire electrode 6 inserted through the lower die 14 is guided to the used wire disposal position by a guide bell) 15, 16, and the connection of the wire electrode 6 is completed. do.

When the connection of the wire electrode 6 is completed, the operation of the IFfm plunger 107 is released, the roller swing motor 111 is operated, the swing drive cam 113 interlocked with this rotates, and the slide lever 114 is slid downward. 2 link 109. Then, the roller swinging lever 104 is swung clockwise via the first link 108 to separate the feed rollers 101 and 102, and at the same time the wire positioning piece 110 is rotated clockwise to rotate the wire electrode. By releasing the positioning and further sliding the slide lever 114 downward, the bottle l engaged with the retaining portion 114b is released.
25 cl rotates the first disc 125 in the counterclockwise direction, and as shown in FIGS. The wire insertion head 17' moves to the left and returns to the above-mentioned retracted position shown in FIG. It descends and a new cutting process is started at another workpiece part that has been lowered to the above-mentioned temperature.

As described above, in the present invention, the wire electrode 6 is connected to the workpiece 4.
A guide pipe 125 is used to insert the guide pipe 125 into the initial hole 4a and the lower die 14.
is the inner pipe 125a formed with the suriwari 125 al.
and an outer pipe 125b forming a suriwari 125b.
The guide pipe 125 is configured to allow the electrode 6 to escape from the slots 125a1 and 125J when the connection of the wire electrode 6 is completed.
Since it is possible to form an extremely thin hole, the initial hole 4a of the workpiece 4 can also be an extremely thin hole, which reduces machining costs and reduces the restrictions on the shape of the cutting process.
Another advantage is that the wires can be connected reliably.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of the main parts of a wire-cut electrical discharge machine using the present invention, FIG. 2 is a perspective view showing the main parts of a wire insertion head using the present invention, and FIGS. 3 and 7 are the same as described above. FIGS. 4 and 8 are operation explanatory diagrams showing the configuration of the main parts of the wire insertion head in different operating states, and FIGS. 5 and 8 are enlarged perspective views showing the main parts of the wire insertion head in different operating states, respectively. FIG. 9 is an enlarged perspective cross-sectional view showing the guide pipe portion of FIG. 4 and FIG. 8, FIG. 6, and FIG.
FIG. 0 and FIG. 11 are operation explanatory diagrams showing different operating positions of the wire insertion head, respectively. 1...Arm, 2...Slide axis, 3
...Processing head, 4...Workpiece, 4
a... Initial hole, 5... Table, 6... Wire electrode, 7... First
Guide roller, 8... Supply roller, 9...
... Pinch roller, 10 ... Second guide roller, 11 ... Upper current-carrying electrode, 12 ... Lower current-carrying electrode, 13 ... Upper die, 14...
...Lower die, 15.16...Guide belt, 1
7...Wire insertion head, 18.19...
...Guide shaft, 20...Support member, 111...
..., roller swing motor, 112... gear train, 113... swing drive cam, 114...
・Slide lever, 114a...Cam operating end,
114b...Engaging portion, 125...Guide pipe, 125a...Inner pipe, 12! 5
at...Suriwari, 125b...Outer pipe, 125 bl...S11 Wari, 125
c...First disc, 125 C+...
Notch, 1250%...Circular groove, 125cs.
...Pin, 125d...Second disc, 1
25d,...notch, 125d9...
Pin Patent Applicant Co., Ltd. Copal Seibu Electric Industry Co., Ltd. Figure 1

Claims (1)

[Scope of Claims] After the cutting process at one workpiece part is completed, the S ear electrode is cut, and the wire electrode is inserted and supplied to the other workpiece part, and a new cutting process is continued. A wire-cut electric discharge machine comprising: a cutter portion that enters a conductive path of a wire electrode to clamp and cut the wire electrode; and a cutter portion that moves to a position along the conductive path of the wire electrode to insert the wire electrode. In the automatic wire connecting device, the guide pipe includes an inner pipe and an outer pipe, each of which has a slot formed therein, a guide pipe that can be pulled or pulled out, a roller that sends out the wire electrode, and a tensioning means for the wire electrode. When the wire electrode is inserted, the inner pipe and the outer pipe are rotated relative to each other to close the slot. When the wire electrode is pulled by a tensioning means and the connection of the wire electrode is completed, the slits of the inner pipe and the outer pipe are aligned so that the wire electrode escapes from the guide pipe. Automatic wire connection device for wire-cut electrical discharge machines.