JPS6311233A - Method of treating cut wire piece for wire cut electrical discharge machine - Google Patents

Abstract

PURPOSE:To make it possible to prevent accidents of short circuit or a wire being caught inside a switching valve, etc. When the electrode wire breaks by cutting the wire to an appropriate length, moving the cut wire piece to the vicinity of a suction inlet of a suction device and sucking the cut wire piece. CONSTITUTION:If a wire 17 breaks in the vicinity of an electrical discharge machining part of a workpiece W, a sensor, detecting the breakage, sends a detection signal to a control device which generates a command signal so that pinch rolls 37 of a wire holding device 33 hold the wire 17 in between and that an upper wire guide device 19 goes up. At the same time, an arm 31 of the holding device rotates and comes down. The wire 17, after being held with a wire clamp at the front end of the arm 31, is heated by energization and is cut at the heated part due to an additional effect of tension application due to the ascent of the guide device 19. As a suction device 37 is actuated automatically when the arm 31 rotates, air in the vicinity of the wire clamp is drawn from a suction port 41 of a suction duct 39 to release the cut wire piece 45. As the cut wire piece 45 is sucked from the suction port 41 into the duct 39, transferred and released into a container 35, no hindrance is caused.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for processing wire cut pieces in wire-cut electric discharge machining, and more specifically, the present invention relates to a method for processing wire cut pieces produced during wire-cutting of electrode wires. The present invention relates to a method for disposing of cut wire pieces in which wire pieces are received at a predetermined location via a predetermined route.

[Prior Art] A wire-cut electrical discharge machine that performs electrical discharge machining by passing a pulsed current between a continuously supplied electrode wire and a workpiece is known. In such a wire cutter electric discharge machine, when cutting a closed curve shape such as drilling a hole in a workpiece one after another, the continuously supplied wire is temporarily cut in front of the workpiece every time one hole drilling is completed. disconnect. Then, the wire end is passed through the pilot hole for wire penetration of the next hole to be machined, and the wire A7 is stretched through the wire A7 guide below the workpiece, multiple guide rolls, etc., to the take-up reel, and the wire is connected. I do.

Furthermore, during MB processing, the wire A7 may be disconnected for some reason, and in this case as well, it is necessary to reconnect the disconnected wire A7 as described above. Automatic wiring devices that automatically perform the above wiring operations are also known. However, in the case of an unexpected wire A/[17i like the latter mentioned above, the shape of the broken end is not constant, and the automatic wire connecting device often cannot perform the wire connecting operation smoothly. In order to avoid this situation and ensure a reliable wire connection operation, the wire cutting and holding device, which is provided in advance as a part of the automatic wire connection station, is operated as follows.

However, when a wire breakage occurs unexpectedly, the wire cutting and holding device detects this state with a sensor, pulls out the broken wire portion by a predetermined length, and then cuts the wire by, for example, heating the wire. With this operation, the wire end takes on a substantially constant conical shape, allowing the automatic wire connecting device to smoothly and reliably perform the wire connecting operation.

[Problems to be Solved by the Invention] However, when the wire is cut as described above, the wire cut pieces are discharged into a processing tank that is provided surrounding the workpiece. There is no particular problem as long as this wire cut piece settles to the bottom of the processing tank and remains stationary. However, it may move as the machining fluid ejects and circulates, and sometimes it may get caught between the discharge electrodes, causing a short circuit. In other words, if the wire cut piece straddles between the electrode wire, the current-carrying member in contact therewith, or the guide holder side member, and the workpiece or workpiece clamp side member, a short circuit will occur. If such a situation were to occur, it would be impossible to continue stable electrical discharge machining.

Moreover, if the cut wire pieces move from the machining tank into the machining fluid circulation supply system and get caught in a switching valve or the like, a situation will occur in which the smooth operation of the switching valve or the like is disturbed. Furthermore, in order to prevent such a situation, if a work is performed to remove the wire cut pieces from the processing tank or the like, the operating rate of the machine will naturally be reduced.

The present invention was devised in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method for processing wire cut pieces of a wire cut electric discharge machining fluid in which cut pieces of an electrode wire do not cause the above-mentioned troubles. .

[Means for Solving the Problems] In order to achieve the above object, the present invention has a method of cutting the wire to a suitable length when the electrode wire of a wire-cut electrical discharge machine breaks, and removing the wire cut piece. The holding means transports the cut wire piece to the vicinity of the suction port of the suction device provided in advance and releases the holding, and the cut wire piece is sucked by the suction device, thereby cutting the wire in the wire-cut electrical discharge machine. The method of processing the pieces was carried out.

[Operation] Accordingly, the wire cut pieces generated when cutting the electrode wire are sucked into the suction device, and are stored in the container through the suction duct attached to the suction device. As a result, the YA1F fragments are not released into the processing tank as in the conventional case, which naturally causes the short circuit and the situation where they get caught inside the switching valve, etc., preventing smooth operation. Never.

[Example] Hereinafter, an example of the present invention will be described in detail using the drawings.

As shown in FIG. 1, the wire-cut electric discharge machine 1 has a column 5 erected on a base 3, and an upper arm 7 and a lower arm 9 provided horizontally at the top and bottom of the column 5. be. The tips of the upper arm 7 and the lower arm 9 are provided facing a processing tank 11 set on the base 3. At the tips of the upper arm 7 and the lower arm 9,
Wire guide devices 19 and 21 are provided to vertically guide the thin electrode wire 17 that is continuously supplied from the supply reel 13 to the take-up reel 15. The upper wire guide device 19 has a structure that allows its position to be adjusted vertically.

In this type of wire cut electrical discharge machining state 1, the vertical part of the electrode 17 between the upper and lower wire guide devices 19 and 21 and the workpiece W supported on the workpiece support stand 23 provided in the machining tank 11. Electric discharge machining is performed in between. The gap between the wire 17 and the workpiece W (discharge
The machining fluid is supplied to the machining section) by a nozzle device (not shown) provided inside one or both of the upper and lower wire guide devices 19, 21.

The basic part of the automatic wire connection device of this wire-cut electrical discharge machine 1 consists of a wire loading device (not shown) that is divided and arranged along the tensioning route of the wire 17, as in the conventional device. That is, the supply reel 1 of the wire 17
3 to the upper guide device 1 via a plurality of guide rolls 25.
9, an upper wire loading device (not shown) is provided along the route of the wire 17. From the upper wire guide device 19 to the lower wire guide device 21 via the electrical discharge machining section of the workpiece W, there is provided a central soi 1 loading device (not shown) that allows the tip of the wire 17 to pass through the inlet using a jet water stream. .

Then, from the lower wire guide device 21 to the winding wheel 15 via each guide roll 27 on the lower side
It consists of a three-part wire loading device including a lower wire loading device (not shown) disposed along the path of the wire 17 to feed the wire 17.

In addition to the above basic parts, the following devices are further provided. That is, as shown in FIGS. 2 and 3, a vertical spindle 29 is provided on the side of the upper guide fitting 19 and is configured to move up and down and rotate by driving a drive device (not shown). An arm 31 is provided.

A holding device 33 is disposed at the tip of the arm 31 as a holding means for cutting the wire and holding the cut wire piece. A wire clamp (not shown), which is part of the wire holding means, is built into the tip of the arm 31. Furthermore, a container 35 is provided at the rear of the processing tank 11 (on the left side in FIG. 2) to receive cut wire pieces, which form part of a suction device to be described later. The suction device 37 is passed from the tip side of the arm 31 of the wire A7 holding device 33 to the receiving container 35 via the side surface (upper side in FIG. 2) of the processing tank 11.
A suction duct 39 constituting a part of is arranged and connected.

The suction port 41' of the suction gutter 39 faces the vicinity of a wire clamp (not shown) inside the arm 31.

This suction duct 39 is made of a metal tube so that the cut wire pieces that pass through it at high speed will not get stuck or caught, but a plastic tube may also be used depending on the length of the cut wire pieces and the diameter of the material. can. Further, in this embodiment, the suction device 37 uses an ejector using compressed air as a driving source.

Processing of wire cut pieces of the wire-cut electric discharge machine 1 of this embodiment configured as described above is performed as follows. That is, if the wire 17 breaks during machining near the electrical discharge machining portion of the workpiece W, a sensor not shown in the drawings detects this state. Then, the wire holding device 33 starts operating in response to a command signal from a control device (not shown). At this time, as shown in FIG. 3, the pinch rolls 43 disposed on the upper side of the upper wire guide device 19 pinch the wire 17, and one of the upper wire guide devices rises.

At the same time as the upper wire guide device is removed, the arm 31 of the wire holding device 33 rotates and descends.
A wire clamp (not shown) built into the tip part 1 holds the wire A717. The clamping position is immediately below the upper wire guide device 19, and after clamping Vi, the wire A717 is heated with electricity. Electricity is supplied to a wire clamp (not shown) inside the tip of the arm 31 and a wire 17 inside the upper wire guide device 19.
This is done using a current-carrying electrode (not shown) that is in contact with the In addition to the above-described electrical heating, a tension imparting action is added to the wire 17 due to the upper limit of one of the upper wire guide devices, and the wire A7 is
17 is cut at the heating section.

After cutting the wire 17, when the arm 31 rotates, the ejector of the suction device 37 is automatically operated, so the air from the suction port 41 of the suction duct 39, especially at the tip of the arm 31 near the wire clamp, is released under tension. is attracted to. Therefore, as soon as the wire cut piece 45 after the cutting operation is released from the wire clamp serving as the holding means, it is reliably sucked into the suction duct 39 from the suction port 41. The container is then transported via an ejector to a container 35, where it is ejected.

Note that the ejector is set and controlled to automatically stop after a predetermined period of time has elapsed after starting.

The above operations are performed in the same way both when the automatic wire connection device is operated automatically and when it is operated manually. Moreover, the machining is performed regardless of the relative machining position between the upper and lower wire guide devices 19, 21 and the workpiece W.

If the wire breaks during electrical discharge machining as described above, the wire cut piece 45 that inevitably occurs will be securely placed in the receiving container 3.
It is sucked and transported up to 5° and is dared here. Therefore,
Unlike the conventional method, it is no longer discharged into the machining tank 11 and moved, causing a short circuit or malfunction of the valve in the machining fluid supply circulation system. Moreover, since the method of this embodiment has the above-described configuration, the apparatus for this purpose can be extremely small and lightweight, and can be installed at low cost.

Furthermore, it can be easily retrofitted to existing conventional automatic wiring devices, and has an extremely wide range of applications.

J3, the method of the present invention is not limited to the embodiments described above, and can be implemented in other embodiments by making appropriate changes. For example, the suction device may be replaced by an ejector, and a suction blower may be provided downstream of the receiving container.

[Effects] As is clear from the above explanation, the method for treating wire cut pieces of a wire cutter electric discharge machine of the present invention can eliminate the various types of wire cut pieces that occur when the wire breaks during electric discharge machining. Obstacles can be definitely eliminated.

[Brief explanation of the drawing]

Figure 1 is a front view of wire cut electric discharge machining in this example.
Figure 2 is a view from ■ to ■ in Figure 1, and Figure 3 is a view from ■ to ■ in Figure 2.
■Please use the arrow view. (Explanation of symbols representing main parts of the drawing) 1...Wire cut electric discharge machining 17...7H pole wire 33...Holding device 35
... Receptacle is a container 37 ... Suction device 39 ... Suction duct 45 ... Wire cut piece agent Patent attorney
Yasuo MiyoshiFigure 1Figure 2Figure 3

Claims (1)

[Claims] When a wire for an electrode of a wire-cut electric discharge machine breaks, the wire is cut to an appropriate length, and the cut wire piece is transported by a holding means to the vicinity of a suction port of a suction device for the cut wire piece provided in advance. A method for processing wire cut pieces of a wire-cut electrical discharge machine, characterized by releasing the holding and causing the suction device to suck the wire cut pieces.