JPH0417304Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is based on a wire electrode that is continuously fed toward a workpiece supported in a machining liquid filled in a machining tank, and the workpiece. This invention relates to a wire-cut electric discharge machine that generates electrical discharge between an object and processes the workpiece using the discharge energy, and particularly relates to a wire electrode guide device for leading the wire electrode out of the processing tank. .

[Prior Art] Conventionally, this type of wire-cut electric discharge machine is generally known. The wire was led out of the tank through a wire guide pipe in a cylindrical arm inserted into one side of the tank.

[Problem to be solved by the invention] However, in this case, the wire guide pipe was fixed inside the cylindrical arm and could not be pulled out, so the wire electrode was cut before or during the wire cut discharge operation. In some cases, when attempting to insert the wire electrode into the wire guide pipe, it is difficult to insert the wire electrode into the wire guide pipe, and the preparation work is time-consuming.

The present invention has been devised to solve the above-mentioned problems, and its purpose is to provide a wire electrode guide device for a wire cut electric discharge machine that allows easy insertion and setting of the wire electrode into the wire guide pipe.

[Means for Solving the Problems] In order to achieve this object, the present invention has a method in which a workpiece is supported in a machining liquid filled in a machining tank, and the workpiece is continuously supplied toward the workpiece. In a wire-cut electric discharge machine that generates an electrical discharge between a wire electrode and a workpiece, and processes the workpiece using the discharge energy, a cylindrical lower arm that is inserted into one side of the machining tank is used. A wire guide pipe for guiding the wire electrode supplied toward the workpiece to the outside of the tank is inserted and supported, and a flexible tube body is inserted into the wire guide pipe at the open end inside the tank of the lower arm. The wire electrode was arranged so as to be able to be taken in and out, and the wire electrode was led out of the tank through the flexible tube body.

[Function] In the present invention having the above configuration, the wire electrode is easily guided to the wire guide pipe by pulling out the flexible tube body from the open end inside the tank of the lower arm and inserting the wire electrode into the tube body. It is extracted outside of processing.

[Example] Hereinafter, an example of this invention will be described in detail with reference to the drawings.

Now, in the wire-cut electrical discharge machine of this embodiment, as shown in FIG. The workpiece W can be supported in a state where L is filled. An upper arm 3 is provided on the frame 1 above the processing tank 2, and an upper electrode guide 4 made of a conductive roller is supported at the lower part of the upper arm 3 so as to be movable in the vertical direction. so as to penetrate the side wall of the processing tank 2 and extend horizontally to a position below the workpiece W.
A lower arm 5 made of a conductive cylindrical body is insulated from the frame 1 and protrudes from the side of the frame 1, and a lower electrode guide 6 made of a conductive roller is attached to the lower arm 5 at its tip. It is supported in an insulated state.

A feeding device 8 for feeding wire electrodes 7 made of metal wire is provided at the upper part of the frame 1, and a winding device 9 for winding up the wire electrodes 7 is provided at the lower part of the frame 1. ing. Then, the wire electrode 7 fed out from the supply device 8 is guided to the winding device 9 through the guide roller 10, the upper electrode guide 4, the lower electrode guide 6, and the guide roller 11, and is wrapped between the electrode guides 4 and 6. It is adapted to be continuously supplied onto the workpiece W.

A power supply circuit is connected between the wire electrode 7 and the workpiece W, and a pulse discharge is repeatedly generated between the wire electrode 7 and the workpiece W, and the workpiece W is machined by the discharge energy. It's summery.
That is, in the power supply circuit, the source terminal of a field effect transistor 13 is connected to one terminal of the DC power supply 12, and the switching control circuit 14 for controlling the switching operation of the transistor 13 is connected to the gate terminal thereof. . A diode 15 and a resistor 16 are connected between the drain terminal of the transistor 13 and the other terminal of the power supply 12 to eliminate reactance caused by the switching operation of the transistor 13. The workpiece W is connected to the ground side terminal of the power supply circuit via the conductive lower arm 5, and the wire electrode 7 is connected to the other terminal of the power supply circuit via the lower electrode guide 6.

A pump 17 is connected to the lower arm 5, and the operation of this pump 17 fills the machining fluid L from the machining fluid tank through the inside of the lower arm 5 into the machining tank 2 at the start of work, and fills the machining fluid L into the machining tank 2 during machining work. The machining liquid L can be supplied between the wire electrode 7 and the workpiece W during machining.

Next, the wire electrode guide device, which is the main part of this invention, will be explained in detail based on FIGS. 2 to 4.

In this embodiment, as shown in FIG. 2, an end plate 21 made of an insulating material is fitted and fixed to the outer end of the tank of the lower arm 5 made of a cylindrical body with a plurality of screws 22. A plurality of support plates 23 made of an insulating material are arranged at predetermined intervals in the arm 5, and a plurality of support plates 23 are arranged between the support plate 23 located inside the tank (on the right side in FIG. 2) and the end plate 21. A retaining rod 24 is installed.

A wire guide pipe 25 is supported through the end plate 21 and the support plate 23 so as to extend in the longitudinal direction at the lower part of the lower arm 5, and the wire electrode 7 can be guided along the guide passage 25a inside the pipe. ing. A flexible tube body 26 is disposed within the guide passage 25a of the wire guide pipe 25 so as to be movable in the direction of the guide passage 25a.
As shown in FIG. 4, one end side can be taken out from the guide passage 25a. As shown in FIG. 3, an engaging body 27 having a pair of engaging protrusions is fixed to one end of the tube body 26, and the innermost support plate 23 is fixed to one end of the tube body 26.
A pair of latching bodies 2 having latching recesses provided thereon
8 to guide the tube body 26 into the guide passage 25a.
It is designed to be kept stored inside.

A power supply line 29 is supported through the end plate 21 and the support plate 23 so as to extend in the longitudinal direction near one side of the center of the lower arm 5, and power is supplied to the wire electrode 7 via this power supply line 29. It's summery. A water supply pipe 30 is supported through the end plate 21 and the support plate 23 so as to extend in the longitudinal direction near the other side of the center in the lower arm 5, and is connected to the wire electrode 7 and the workpiece through this water supply pipe 30 during processing operations. A machining liquid L is supplied between the workpiece W and the workpiece W. A supply pipe 31 is supported through the end plate 21 at the upper part of the outer end of the tank of the lower arm 5. At the start of work, etc., the machining liquid L is supplied into the lower arm 5 through the supply pipe 31, and the machining fluid L is supplied through the lower arm 5. The machining tank 2 is filled with machining fluid L.

As shown in FIG. 4, a conductive bracket 33 is attached to the inner end of the lower arm 5 via an insulating plate 23, and the lower electrode guide 6 is rotatably supported at the tip of this bracket 33. , which guides the wire electrode 7 around and supplies power to the wire electrode 7. A pair of cylindrical bodies 34 and 35 through which the wire electrode 7 is inserted is attached to the bracket 33, and a guide body 36 for guiding the wire electrode 7 is disposed inside the bracket 33. A fitting hole 37 is formed in a part of the bracket 33, and the inner end of the power supply line 29 is fitted into this fitting hole 37, and a wire is passed from the power supply line 29 through the bracket 33 and the lower electrode guide 6. Electricity is supplied to the electrode 7. Further, a connection port 38 is formed on the bracket 33, and the inner end of the water supply pipe 30 is connected to this connection port 38 via a coupling ring 39.
The machining fluid L is supplied to the machining chamber via the cylindrical body 34 which acts as a nozzle.

When starting work with this wire-cut electric discharge machine, or when the wire electrode 7 is cut during work, etc., it is necessary to insert the wire electrode 7 into the guide passage 25a in the lower arm 5. As shown in FIG. 4, one end of the flexible tube body 26 is taken out from inside the guide passage 25a of the wire guide pipe 25, and the lower electrode guide 6 is made to go around and placed below the lower cylindrical body 35. In this state, when the end of the wire electrode 7 is inserted into the upper cylindrical body 34 from above through the workpiece W and sequentially fed downward, the wire electrode 7
The end portion of the wire guide pipe 25 is inserted and guided through the tube body 26 into the guide passage 25a of the wire guide pipe 25.
Therefore, at that time, if the tube body 26 is housed in the wire guide pipe 25, the wire electrode 7 can be easily inserted and disposed along the guide passage 25a with a simple operation. If the workpiece W is large, the end of the wire electrode 7 is inserted through the workpiece W into the upper cylindrical body 34 from above and fed downward, and is fed downward into the lower cylindrical body 35. At the same time as pulling out the wire electrode 7, as shown by the two-dot chain line in FIG. When the electrode 7 is sent in, it is inserted and guided into the guide passage 25a of the wire guide pipe 25, and the wire electrode 7 can be easily inserted and arranged along the guide passage 25a.

It should be noted that this invention is not limited to the configuration of the above-mentioned embodiments, and the configuration of each part can be arbitrarily changed and embodied without departing from the spirit of the invention.

[Effects of the invention] As detailed above, this invention makes it extremely easy to insert the wire electrode into the wire guide pipe of the processing tank when starting work or when the wire electrode breaks during work. This has the effect of greatly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing an outline of a wire-cut electric discharge machine embodying this idea, and Fig. 2 is a partial enlarged cross-sectional view showing the lower arm cut along the axis of the internal pipe, etc. 3 is an enlarged sectional view taken along the line A--A in FIG. 2, and FIG. 4 is a partial sectional view showing an enlarged structure of the inner end of the lower arm. In the figure, 2 is a processing tank, 5 is a lower arm, 6 is a lower electrode guide, 7 is a wire electrode, 25 is a wire guide pipe, 25a is a guide passage, 26 is a flexible tube body, and W is a workpiece. .

Claims (1)

[Claims for Utility Model Registration] A workpiece W is supported in a machining liquid L filled in a machining tank 2, and a wire electrode 7 and the workpiece are continuously supplied toward the workpiece W. In a wire-cut electrical discharge machine that generates an electrical discharge between the workpiece W and processes the workpiece W using the discharge energy, a cylindrical lower arm 5 inserted into one side of the processing tank 2 is provided with the workpiece W. A wire guide pipe 25 for guiding the wire electrode 7 supplied toward the workpiece W out of the tank is inserted and supported, and a flexible tube body 26 is inserted into the wire guide pipe 25 and is connected to the tank of the lower arm 5. The wire electrode 7 is disposed so that it can be taken in and out from the inner open end, and the wire electrode 7 is inserted into the flexible tube body 2.
6. A wire electrode guide device for a wire cut electrical discharge machine, characterized in that the wire electrode guide device is configured to be guided out of the tank via a wire electrode guide device.