JP2568094B2 - Wire recovery device for wire electric discharge machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire recovery apparatus for recovering used wires in a wire electric discharge machine, and more particularly to a wire recovery apparatus capable of collecting wires in a recovery box with high density.

2. Description of the Related Art In a wire electric discharge machine, a wire on which a work is machined (a wire after use) passes through a winding roller and is then wound around a take-up reel or accommodated in a wire collection box.

In the wire collection box, the wire discharged from the winding roller is stored in the wire collection box in a free state, but since the wire has a certain degree of rigidity, the cross-sectional area of the wire collection box When the width is narrow, the wires stand up after contacting the wall surface of the box, as shown in FIG. In this state, it is very bulky and the storage capacity of the wire collection box is greatly reduced.
It will need to be replaced frequently. This situation is a great inconvenience in the wire electric discharge machine, which is normally operated continuously for a long time, because of monitoring and labor burden during that time.

Even if the same wire is used, if the cross-sectional area of the wire collection box is increased, the wire can be rolled in order and stored densely, as shown in Fig. 5 (b). The position of the pinch roller must be at the same height, and it may be difficult to make the cross-sectional area of the wire collection box large and the position of the winding roller at the required height in the wire electric discharge machine. .

The above-mentioned wire entanglement in the wire collection box is further promoted by the recent tendency of the wire to become hard and thick (stiffer), and the capacity of the wire collection box becomes a problem in the wire electric discharge machine. There is.

Problems to be Solved by the Invention The present invention eliminates entanglement of wires during collection and can be stored with high density, without increasing the cross-sectional area of the wire collection box or raising the position of the winding roller.
An object of the present invention is to provide a wire recovery device that exhibits a sufficient storage capacity.

Means to solve the problem The reduction of the wire storage capacity in a small wire collection box with a small cross-sectional area is related to the rigidity of the wire, and it tends to spread larger than it is packed together due to so-called waist strength. In view of the strong tendency, the wire recovery device of the wire electric discharge machine is provided with an annealing means for energizing and annealing the wire between the winding roller and the wire recovery box.

Further, when a higher storage capacity is required, the wire is energized for about 1 second and then an annealing means is provided by intermittent energization for a predetermined rest time to provide a foldable wire storage form. And

The working annealing means energizes the wire connected between the winding roller and the wire recovery box, and the Joule heat at that time anneals the wire.

Example FIG. 3 shows the outline of the wire electric discharge machine 1.
Column 3 is erected on bed 2 and table 4 is
It is arranged so that it can move in the X and Y directions. The column 3 is composed of a vertical portion 5 and a lateral portion 6 that is cantilevered, and a lower arm 7 projects from the lower portion of the vertical portion 5 in the same direction facing the lateral portion 6. An upper guide 8 is provided at the tip of the lateral portion 6, a lower guide 9 is provided at the tip of the lower arm 7, and a work 11 is placed on the work stand 10.

The wire 12 for electrical discharge machining is a brass wire of φ0.25 in this case,
The winding roller 1 passes from the wire delivery reel 13 through the inside of the brake roller 14, the guide roller 15, the upper guide 8, the lower guide 9, and the lower arm 7, and the guide rollers 16, 16 and the like.
7, it is pinched by the pinch rollers 18, and is ejected toward the wire collection box 19 from there.

The wire collection box 19 is a metal container that is electrically conductive.
As shown in the figure, it is placed on the floor via an insulator 20, and is connected to one end of the secondary side of the slid transformer 21.

The pinch roller 18 is made of metal and is connected to the 20 V tap which is the other end of the transformer 21 on the secondary side.
It is connected to the pinch roller 18 with a brush 23 via 2.
An AC (commercial power supply) of 200 V is connected to the primary side of the slider transformer 21. The switch 24 is for cutting off the power supply when the wire 12 is not run.

Therefore, when the wire electric discharge machine 1 is operated,
The winding roller 17 pulls the electric discharge machining wire 12 under a predetermined tension against the braking force of the brake roller 14, and the workpiece 10 is processed by arc discharge between the upper and lower guides 8 and 9.

Then, the wire 12 that has passed through the lower guide 9 (the wire after use) is sandwiched between the winding roller 17 and the pinch roller 18 and discharged to the wire collection box 19, but is insulated from the pinch roller 18 as described above. Since the secondary side voltage of the slid transformer 21 is applied between the metallic wire collecting boxes 19, the tip of the discharged wire 12 comes into contact with the wire collecting box and at the same time between the winding roller 17 and the wire collecting box 19. A current of about 5 A is applied to the wire 12 of the.

Therefore, the wire 12 is heated to a high temperature by Joule heat due to the internal electric resistance of the brass wire, is annealed, loses its so-called rigidity, and is in a state in which a soft cord is gently dropped. In this sense, the metal pinch roller 18 and the wire recovery box 19, and the sliderac transformer 21 and the limiting resistor 22 for applying and applying a voltage to them as a whole anneal the wire 12 in this embodiment. It is a means for annealing.

The current flowing through the wire 12 needs to be adjusted according to the material and thickness of the wire used in order to obtain sufficient heat generation for annealing, but in this embodiment, the secondary side tap of the slider transformer 21 and The limiting resistor 22 is a current adjusting means for the wire 12.

After that, the wires 12 continuously discharged are sequentially annealed in the same manner and lose rigidity, so that the wires are neatly wound and stored in the wire recovery box 19.

FIG. 2 shows an embodiment of the second invention, which has the same technical concept as the above, but can collect the wires 12 in the wire collecting box 19 in a higher density state. The winding roller 17 and the pinch roller 18 are arranged near the upper end of one side wall of the wire collecting box 19 as shown in FIG. 4, and the wire 12 discharged from this is directed toward the inner surface of the other side wall of the collecting box 19. Then, between the brush 23 in contact with the pinch roller 18 from the other end of the secondary side of the slider transformer 21 in the annealing means, an on / off timer 25 is interposed, and a wire between the winding roller 17 and the wire recovery box 19 12 is energized intermittently.

The power is intermittently applied for about 1 second, and then the wire 12 is returned to the recovery box 19
From the winding roller 17 located on one side wall to the front of the other side wall of the collection box 19, that is, the movement amount of the discharged wire 12 is the distance between the one side wall and the other side wall of the wire collection box 19. This is a cycle in which there is a rest time equal to the amount of time that is a little smaller.

According to this configuration, as shown in FIGS. 4A to 4D, the wire 12 is laterally discharged by the winding roller 17 and the pinch roller 18, and first, the inner peripheral surface of the other side wall of the wire recovery box 19 is first provided. The timer 25 is turned on in the state where the current has reached, and the same energization as described above is received for about 1 second. Then the wire collection box
The wire 12 that existed across the inside of 19 was annealed by the heat generated and drooped toward the side wall as shown in Fig. (B), and the timer was reached after a lapse of time to reach this state.
25 is turned off and power is turned off.

When the wire 12 is continuously sent, the timer 25 is turned off, so that the wire 12 crosses the inside of the wire recovery box 19 by the rigidity as in the first case, and faces the other side wall as shown in FIG. The timer 25 is turned on and energized in the procedure in which the tip reaches the other side wall. Then, due to the rigidity, the wire 12 that has traversed the inside of the wire recovery box 19 is annealed and drips toward the side wall (d).
By repeating this, the used wire 12 is folded and stored in the wire collection box 19.

In the second invention, since the wire 12 is discharged laterally, the wire recovery box 19 can have a large cross-sectional area, but a winding roller.
Even if the position of 17 cannot be set high, there is an advantage that the wires can be stored with high density.

In the present invention, the pinch roller may be made of a conductive material only in the portion in contact with the wire, and the wire collection box may be made of a conductive material only on the inner surface.

EFFECTS OF THE INVENTION It is possible to store the used wires at a high density and improve the storage capacity of the wire collection box having a narrow cross-sectional area.

According to the second aspect of the present invention, by folding and storing the wire, a higher storage capacity can be exerted and
It is possible to store the wires densely in the wire collection box having a relatively large cross-sectional area from the winding roller at the lower position.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an essential part of the first invention, FIG. 2 is a diagram for explaining an essential part of the second invention, FIG. 3 is a schematic front view, and FIG. FIG. 5 is a diagram for explaining the situation, and FIG. 5 is a diagram for explaining a conventional example. 1 ... Wire electric discharge machine, 2 ... Bed, 3 ... Column, 4 ... Table, 5 ... Vertical part, 6 ... Horizontal part, 7
...... Lower arm, 8 ... Upper guide, 9 ... Lower guide, 10 ...
… Work table, 11 …… Work, 12 …… Electric wire, 13 …… Wire feeding reel, 14 …… Brake roller, 15 …… Guide roller, 16 …… Guide roller, 17
...... Winding roller, 18 …… Pinch roller, 19 …… Wire collection box, 20 …… Insulator, 21 …… Slidac transformer, 22 …… Limiting resistance, 23 …… Brush, 24 …… Switch,
25 …… Timer.

Claims (3)

(57) [Claims] 1. An annealing means for energizing and annealing a wire between a winding roller and a wire recovery box is provided.
Wire recovery device for wire electric discharge machine. 2. The annealing means has an energizing circuit provided with an output current adjusting means.
The wire recovery device of the wire electric discharge machine described in the item. 3. A winding roller is arranged near the upper end of one side wall of the collection box so that its discharge wire is directed toward the inner surface of the other side wall, and the wire between the winding roller and the wire collection box is energized for about one second. The wire electric discharge machining is characterized in that an annealing means for annealing by intermittent energization with a rest time equal to the time the discharge wire moves for a distance slightly smaller than the distance between one side wall and the other side wall of the wire collection box is provided. Equipment wire recovery device.