JPH05301123A - Wire electrode collection device for wire electric discharge machine - Google Patents

Abstract

PURPOSE:To make collection work easier by selecting a batter installation position for a detector which detects the collection limit of a collection box which stores used wire electrodes from a wire electric discharge machine. CONSTITUTION:A detector 36 separate from a collection box 20 is provided between a pair of rollers 15, 16 for feeding used wire electrodes 8 from a wire electric discharge machine and the collection box 20 located approximately below the rollers 15, 16. This constitution allows the collection box 20 to be replaced without removing the wiring of the detector 36 only when the collection box 20 reaches its collection limit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for collecting so-called used wire electrodes after electric discharge machining in a wire electric discharge machine.

[0002]

2. Description of the Related Art Conventionally, as a recovery device of this type, as shown in Japanese Patent Laid-Open No. 3-44523, a recovery box is arranged below a pair of rollers for feeding a processed wire electrode,
Used long wire electrodes are spirally deposited in the collection box to be collected, and the light emitting element and the light receiving element in the detector are fixed to the upper edge of the collection box so as to face each other, and the deposited wire electrode is In some cases, when the light received by the light receiving element is blocked, it is judged that the recovery limit has been exceeded.

[0003]

However, in the detector composed of the light emitting element and the light receiving element, wires for power supply and signals are usually connected to a control device or the like. In addition, since the deposited wire electrodes are discarded, it is necessary to transport the collection box to another place. At that time, the conventional collection box has a problem that it takes time and effort to disconnect the detector from the wiring. It was Since a detector must be attached to each recovery box, at least another replacement recovery box requires a detector, which increases the production cost.

Further, since the detector is located at the upper edge of the collection box, the wiring part for the detection box is likely to come into contact with the wire electrode fed to the collection box, and an electrical short circuit may occur. There was also the problem of being easy. It is an object of the present invention to solve such a problem, to facilitate the work of discarding the recovered wire electrode, and to provide a highly reliable recovery device that does not cause a failure when recovering the wire electrode. ..

[0005]

In order to achieve the above object, a wire electrode collecting apparatus of the present invention is provided with a feeding means for feeding a wire electrode after electric discharge machining, and is located substantially below the feeding means. A collection box for collecting the wire electrodes that have been fed and dropped, and a detection means that is located between the feeding means and the collection box and that detects the collection limit of the wire electrodes accumulated in the collection box. It is configured by.

[0006]

Embodiments Next, embodiments embodying the present invention will be described with reference to FIGS. A machining tank 2 is placed on a base 1 of the wire electric discharge machine, and the workpiece W fixed on the work table 3 is immersed in the machining tank 2 in the machining liquid. The insulating machining liquid 5 is supplied from the machining liquid supply device 4, the polluted machining liquid 5 is collected in the machining liquid supply device 4, filtered through a filter or the like, and then circulated again to be supplied.

A wire bobbin 9 around which a wire electrode 8 is wound is provided on the upper portion of the column 7, and an upper guide portion 11 is formed on an upper arm 10 supported on the upper portion of the column 7. A lower guide portion 13 is arranged on the lower arm 12 supported on the lower portion of the column 7. The wire electrode 8 pulled out from the wire bobbin 9 is stretched from the upper guide portion 11 to the lower guide portion 13 via the workpiece W in a substantially vertical shape, and is connected to the wire electrode 8 and the workpiece W from a power source (not shown). Electric discharge machining is performed in a minute gap (electric discharge machining section) between the workpiece W and the wire electrode 8 passing vertically downward by passing a pulse current. It should be noted that the machining liquid 5 is ejected toward the electric discharge machining portion from a nozzle portion (not shown) in both or one of the upper guide portion 11 and the lower guide portion 13 to remove metal scraps in the electric discharge machining and perform electric discharge machining. Cool down the parts. The feeding speed (moving speed) of the wire electrode 8 varies depending on the electric discharge machining conditions, the plate thickness of the workpiece W, etc., but is generally about 50 to 300 mm / sec. For example, when the plate thickness is 50 mm, 100 mm / It is about a second.

The direction changing pulley 14 is the lower guide portion 13 described above.
Used wire electrode 8 which is arranged below the wire and whose feeding direction is changed in the lateral direction by the direction changing pulley 14.
Is forcibly sandwiched and fed by a feeding means composed of a pair of rollers 15 and 16 arranged behind the direction changing pulley 14. One roller 15 in the feeding means of the present invention
Is driven to rotate by the drive motor 17 (see FIG. 3). As shown in FIG. 2, the guide body 18 includes the pair of rollers 1
5, 16 are arranged at the rear in the feeding direction, and a cutting device 19 is arranged on the rear side of the guide body 18, and the wire electrode cut by the cutting device 19 to about 1 cm to 3 cm is
It is deposited in the recovery box 20 arranged below.

2 and 3 show an embodiment of the recovery device of the present invention. The drive motor 17 and the cutting motor 21 in the cutting device 19 are fixed to the base body 22, and are respectively attached to the roller 15 and the cutting rotor 23. It is connected and transmits its rotational force. The other roller 16 is pivotally supported by a base body 22 so as to be vertically rotatable via a pinch lever 24. The spring 25 and its pressing force adjusting screw 26 press the roller 16 against the roller 15, and in between. Wire electrode 8
To pinch.

The fixed blade body 27 of the cutting device 19 is fixed to a fixed base 28 by mounting eccentric pins 29, and the fixed base 28 is fixed to the base body 22 via an electrically insulating member 30. A notch groove 31 is formed on the fixed base 28, and a clearance adjusting screw 32 for adjusting the width of the notch groove 31 is used to adjust a clearance dimension with a rotary blade body 33 described later.

The cutting rotor 23 is made of an electrically insulating material and supports a chip holder 34 that holds a rotary blade 33. Wire electrode piece 8a to the collection box 20
In order to increase the recovery density of the above, the control device 35 described later controls so that the rotation speed of the cutting motor 21 and the rotation speed of the drive motor 17 of the roller 15 are synchronized. Thereby, even if the feeding speed (moving speed) of the wire electrode 8 changes, the used wire electrode 8 can be cut into the wire electrode pieces 8a having substantially the same length. The wire electrode piece 8a in this embodiment is about 15 mm.

A detector 3 arranged below the cutting device 19.
As 6, a non-contact type, for example, a light reflection type detector is used. As shown in FIG. 2, the detector 36 is detachably attached to an attachment base 37 attached to the lower portion of the base body 22 below the cutting rotor 23 via screws (not shown). Also, as shown in FIG.
The detector 36 is attached to the mounting base 37 so that the light projecting direction of the detector 36 is directed obliquely downward toward the inside of the recovery box 20 at the lower position.

By detecting the light reflected on the upper surface of the wire electrode piece 8a deposited in the collection box 20, the amount of the wire electrode piece 8a deposited, and thus the collection limit, can be detected. Usually, the volume of the recovery box 20 is 70 to
The position and the sensitivity of the detector 36 are adjusted so that the collection limit is reached with an accumulated amount of about 80%. The cutting device 1
On the front surface of 9 or the like, a cover body 38 that is guided to the recovery box 20 is detachably arranged so that the cut wire electrode pieces 8a do not scatter.

Further, the controller 3 of this wire electric discharge machine
5 will be described with reference to FIG. The control device 35 is
It is mainly composed of a central processing unit (CPU) 40, a read-only memory (ROM) 42 storing a control program, a readable / writable memory (RAM) 44 storing various data, and a computer having a bus connecting them. Yes, it is provided inside the base 1.

The central processing unit (CPU) 40 includes the drive motor 17, the cutting motor 21, the detector 36 and the recovery box 2.
An alarm device 39 such as a buzzer for notifying that the accumulated amount of the wire electrode pieces 8a in 0 has reached the limit is connected to the CPU 4
Controlled by 0. Next, the cutting and collecting operation of the used wire electrode 8 in the wire electric discharge machine configured as described above will be described.

First, the used wire electrode 8 after electric discharge machining
However, the drive motor 17 drives the pair of rollers 15, 1
When it is fed from 6, it passes through the guide body 18 and is guided to the position of the trailing edge blade portion while contacting the fixed blade body 27.
Then, the cutting motor 21 is driven by the CPU 40,
It is cut by the rotary blade 33 that rotates upward in the direction of arrow A in FIG. Then, the wire electrode piece 8a cut into a predetermined length is deposited in the lower recovery box 20 by its own weight. When the accumulated amount reaches a predetermined limit, that is, when the reflectance detected by the detector 36 becomes equal to or larger than the value stored in the ROM 42, the CPU 40 notifies the operator of the fact by the alarm device 39.

Then, the operator replaces the empty collection box 20 with the collection box 20 that has reached the collection limit. In this case, unlike the conventional case, since the collection box 20 and the detector are not integrated, only the collection box 20 needs to be replaced, and the replacement work can be extremely simple. Further, when the detector 36 is mounted on the lower surface side of the mounting base 37 which is arranged obliquely above the side of the collection box 20, the mounting base 37 also serves as a cover body for protecting the upper side of the detector 36. Therefore, it is possible to prevent the detector 36 and its wiring portion from coming into contact with the wire electrode 8 falling from above during recovery, which is safe.

The feeding device for feeding the used wire electrode may be a cylindrical guide body instead of the roller pair. The cutting device is not limited to the fixed blade and the rotary blade, and may be a guillotine cutter. further,
Needless to say, the used wire electrode may be collected in the collection box as it is without being cut.

[0019]

As described above in detail, the wire electrode recovery device in the wire electric discharge machine of the present invention detects, by the detection means, that the wire electrode accumulated in the recovery box has reached the recovery limit. Yes, you can replace the collection box before it overflows. Further, since the detection means is installed in an upper part different from the collection box, only the collection box needs to be replaced when exchanging the collection box, and the wiring with the detection means is disconnected and reconnected as in the conventional case. This has the effect of saving the trouble of performing the wiring work. In addition, since it is not necessary to attach the detection means to each recovery box, the effect that the installation cost can be reduced is achieved.

Further, since the detecting means is arranged above the collecting box, the wiring portion for the detecting means is less likely to come into contact with the wire electrode fed to the collecting box, and is electrically short-circuited. There are no accidents that occur, and there is the effect of being safe.

[Brief description of drawings]

FIG. 1 is a schematic side view of a wire electric discharge machine.

FIG. 2 is a front view of a wire electrode recovery device.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a block diagram of a control device.

[Explanation of symbols]

 8 wire electrode 8a wire electrode piece 15,16 roller 18 guide body 19 cutting device 20 collection box 27 fixed blade body 33 rotary blade body 24 collection box 36 detector 37 mounting base 38 cover body 39 alarm device

Claims (1)

[Claims] 1. A feeding means for feeding a wire electrode after electrical discharge machining, a collection box located substantially below the feeding means for collecting the fed and falling wire electrode, and a feeding box. A wire electrode recovery device in a wire electric discharge machine, comprising: a detection unit located between the recovery unit and the recovery box for detecting a recovery limit of the wire electrode accumulated in the recovery box.