JPH07328848A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To provide an electric discharge machine by which automatic connection can be reliably performed even when an iron core composite wire is used needless to say when a brass wire is used as an electrode wire. CONSTITUTION:In an electrode wire 2 sent out by a pushing-in driving ring 4, a twisting habit and a winding habit are corrected by an electrode wire correcting part 6. This electrode wire correcting part 6 is composed of plural rollers alternately arranged on the advancing directional both sides of the electrode wire 2, and when the electrode wire 2 passes between these rollers, it is alternately and repeatedly bent in the mutually inverse directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining for feeding an electrode wire to a material to be processed and generating an electric discharge between the electrode wire and the material to be processed to machine the material to be processed. The present invention relates to a machine, and more particularly, to an electric discharge machine equipped with an automatic wire connection function for electrode wires.

[0002]

2. Description of the Related Art FIG. 3 is a schematic view showing a conventional electric discharge machine. This type of electric discharge machine is used for the work material (workpiece) 17
The electrode wire supply portion 10 and the electrode wire receiving portion 2 which are arranged so as to sandwich them.
It is composed of 0 and. The reel 1 on which the electrode wire 2 is wound is mounted on the outer side of the electrode wire supply unit 10, and the electrode wire 2 unwound from the reel 1 enters the electrode wire supply unit 10 via the guide 3. . In the electrode wire supply unit 10, an electrode wire pushing-in drive ring 4 and a rolling roller 5 arranged above the drive ring 4 and rotatably rotated by the drive ring 4 are arranged. Electrode wire 2 that has entered the electrode wire supply unit 10
Is wound around the drive ring 4 once or a plurality of times. The drive ring 4 is rotated by being driven by a drive device (not shown).
When is rotated, the electrode wire 2 is driven by the drive ring 4 due to the frictional force.
And is passed downward between the rolling roller 5 and the rolling roller 5. Below the drive ring 4, an electrode 7 for supplying electric power to the electrode wire 2, a cutter portion 8 capable of cutting the electrode wire 2 and a jet water supply portion 9 for jetting a working liquid downward.
a and 9b are provided. The electrode wire 2 sent out by the drive ring 4 contacts the electrode 7, passes through the cutter portion 8 and the jet water supply portions 9a and 9b, and then passes through the electrode wire supply portion 1
It is sent out to the work material 17 side through the nozzle 11 provided at the lower end of 0.

The workpiece 17 has, for example, a prepared hole 17a in advance.
Is provided, and the electrode wire 2 passes through the prepared hole 17a, and the nozzle 21 provided at the upper end of the electrode wire receiving portion 20.
Enters the electrode wire receiving portion 20. Electrode wire receiving part 20
An electrode 22, a guide 23, and the like are provided inside, and after the electrode wire 2 contacts the electrode 22, the electrode wire 2 is guided downward by the guide 23 and exits below the electrode wire receiving portion 20 via the outlet portion 25. . A plurality of rollers 2 are provided below the electrode wire receiving portion 20.
4 are provided, the electrode wire 2 is discharged to the outside by the rotation of these rollers 24, and the electrode wire supply unit 10 is also provided.
Tension is applied to the electrode wire 2 between the drive ring 4 and the roller 24.

Next, the operation of the electric discharge machine configured as described above will be described. It is assumed that the workpiece 17 is provided with a prepared hole 17a in advance. First, drive ring 4
When is rotated, it is pulled by the drive ring 4 to unwind the electrode wire 2 from the electrode wire reel 1, and the electrode wire 2 enters the electrode wire supply unit 10 via the guide 3. Then, the electrode wire 2 is pushed downward by the drive ring 4 and the rolling roller 5. The electrode wire 2 exits from the nozzle 11 and passes through the prepared hole 17a of the work piece 17 to form the electrode wire receiving portion 2
0, and is discharged to the outside through the roller 24. In this case, electric power is supplied to the electrode wire 2 from the electrodes 7 and 22, and an electric discharge is generated between the electrode wire 2 and the workpiece 17. By moving the electric discharge machine relative to the workpiece 17, the workpiece 17 can be machined into a predetermined shape.

After the predetermined processing on the material to be processed is completed, the electrode wire 2 is cut by the cutter portion 8. Then, for example, when the next workpiece 17 is sent, the machining liquid is jetted downward from the jet water supply units 9a and 9b at a high speed. The tip of the electrode wire 2 is conveyed downward from the nozzle 11 by this jet of the working liquid, passes through the prepared hole 17a of the workpiece 17, and passes through the nozzle 21 of the electrode wire receiving portion 20 to the electrode wire receiving portion 20. Get in Then, it is guided by the guide 23, moves further downward, and is conveyed to the outside via the roller 24. In this way, the electrode wire 2 is automatically connected between the electrode wire supply portion 10 and the electrode wire receiving portion 20 after one electric discharge machining is completed.

[0006]

However, in the above-mentioned conventional electric discharge machine, when the brass (brass) wire, which is a general-purpose electrode wire, is used, the straightness of the electrode wire is relatively good. Although the probability of successful connection is high, when a composite electrode wire with an iron core with excellent high temperature strength (hereinafter referred to as iron core composite wire) is used as the electrode wire, the twisting habit when wound on a reel Alternatively, since the curl remains on the electrode wire, the electrode wire is easily caught in the nozzles 11 and 21 or the prepared hole 17a of the workpiece 17 during automatic connection, which makes automatic connection difficult. Therefore, conventionally, when the iron core composite wire is used as the electrode wire, there is a problem that the automatic wire connecting function cannot be used. Further, even if the electrode wire is a brass wire, the frequency is low, but the electrode wire may be caught due to a twisting tendency or a winding tendency of the electrode wire, and there is a problem that reliability of automatic connection is low. Although there is an electric discharge machine equipped with a guide pipe for guiding the tip end of the electrode wire to the nozzle 11, even this kind of electric discharge machine cannot sufficiently prevent the electrode wire from being caught.

The present invention has been made in view of the above problems, and it is possible to surely perform automatic electrical discharge machining not only when a brass wire is used as an electrode wire but also when an iron core composite wire is used. The purpose is to provide a machine.

[0008]

DISCLOSURE OF THE INVENTION An electric discharge machine according to the present invention is an electric discharge machine having a function of automatically connecting electrode wires, and electrode wire feeding means for feeding the electrode wires toward a workpiece, and this electrode. An electrode wire straightening unit for straightening the curvature of the electrode wire sent out by the wire sending-out means.

[0009]

In the electric discharge machine according to the present invention, the curvature of the electrode wire sent by the electrode wire sending means is corrected by the electrode wire correction section. The electrode wire straightening unit is composed of, for example, a plurality of rollers arranged along the traveling direction of the electrode wires, and the electrode wires are laid in a wave shape between these rollers. When the electrode wire passes between these rollers, the electrode wire is alternately and repeatedly curved in the opposite directions, whereby the twisting habit and winding habit of the electrode wire are corrected.

In the present invention, since the curvature of the electrode wire is corrected by the electrode wire correction portion as described above, the straightness of the tip end portion of the electrode wire at the time of automatic connection is good, and an iron core composite wire or the like is used as the electrode wire. Even when used, it is possible to reliably prevent the electrode wires from being caught and improve the reliability of automatic connection.

[0011]

Embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing an electric discharge machine according to an embodiment of the present invention. The present embodiment is different from the conventional one in that the electrode wire straightening portion 6 is provided between the drive ring 4 and the electrode 7, and other configurations are basically the same as the conventional one. In FIG. 1, the same parts as those in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the electrode wire 2 sent out by the drive ring 4 is supplied from the nozzle 11 to the electrode wire receiving portion 20 side through the electrode wire straightening portion 6. As shown in FIG. 2, the electrode wire straightening unit 6 is composed of a plurality of (five in the figure) rollers 13a to 13e and a guide pipe 14, and the rollers 13a to 13e are the rollers 13a to 13e. The electrode wires 2 passing between 13e are alternately arranged on both sides in the traveling direction of the electrode wires 2 so as to have a wavy shape. When the electrode wire 2 passes between the rollers 13a to 13e, the electrode wires 2 are alternately curved in directions opposite to each other by the rollers 13a to 13e. In this case, the roller 1
3a to 13e are arranged so that the curvature applied to the electrode wire 2 becomes smaller toward the downstream side in the electrode wire traveling direction, for example. In this way, by curving the electrode wires 2 alternately in mutually opposite directions, the twisting and winding habits of the electrode wires 2 can be corrected.

Below the electrode wire straightening portion 6, as in the conventional case, the electrode 7, the cutter portion 8, the jet water supply portion 9a,
9b and a nozzle 11 are provided.

In this embodiment, since the electrode wire straightening portion 6 is provided between the driving ring 4 and the electrode 7, the twisting habit and the winding habit are constantly corrected at the tip of the electrode wire at the time of automatic connection. The straightness is good. For this reason, it is possible to reliably prevent the electrode wires from being caught at the time of automatic connection, and it is possible to improve the reliability of the automatic connection function of the electric discharge machine. In particular, even in the case of an iron core composite wire, which has been conventionally considered difficult to perform automatic connection, the reliability of the automatic connection function can be improved.

Hereinafter, the result of actually manufacturing the electric discharge machine according to the present embodiment and examining the automatic connection property will be described in comparison with the conventional example.

First, as an example, an electric discharge machine having an electrode wire straightening portion shown in FIG. 2 was manufactured, and a brass wire, an iron core composite wire and a piano wire were used as the electrode wire, and the automatic wire connecting property was examined. It was Also, in the conventional electric discharge machine having no electrode wire straightening part, the same electrode wire was used to examine the automatic wire connection property. The results are shown in Table 1 below.

[0017]

[Table 1]

As is clear from Table 1, in the conventional electric discharge machine, when the brass wire was used as the electrode wire, the iron wire composite wire and the piano wire were used although the automatic wire connecting property was relatively good. In that case, the automatic connection property was significantly reduced. On the other hand, in the electric discharge machine of the embodiment, when the brass wire, the iron core composite wire and the piano wire are used as the electrode wire, there is no failure in the automatic wire connection, and the reliability of the automatic wire connection function is extremely high. It was

[0019]

As described above, according to the present invention, since the electrode wire straightening portion for correcting the curvature of the electrode wire fed by the electrode wire feeding means is provided, the electrode wire straightening portion can be used The twisting tendency and the winding tendency are corrected, the straightness of the tip end portion of the electrode wire at the time of automatic connection becomes extremely good, and the reliability of the automatic connection can be remarkably improved. In particular, the electric discharge machine according to the present invention can automatically connect the iron core composite wire, which has been considered difficult in the past.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an electric discharge machine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing the electrode wire correcting portion.

FIG. 3 is a schematic view showing a conventional electric discharge machine.

[Explanation of symbols]

 1; Reel 2; Electrode wire 3, 23; Guide 4; Push-in drive ring 5; Rolling roller 6; Electrode wire straightening section 7, 22; Electrode 8; Cutter section 9a, 9b; Jet water supply section 10; Electrode wire supply Part 17; Workpiece material 17a; Prepared holes 11, 21; Nozzle 20; Electrode wire receiving part 24; Roller

Claims (2)

[Claims] 1. An electric discharge machine having a function of automatically connecting electrode wires, the electrode wire sending-out means sending out the electrode wires toward a workpiece, and correcting the curvature of the electrode wires sent out by the electrode wire sending-out means. An electric discharge machine comprising: an electrode wire straightening part. 2. The electrode wire straightening unit is composed of a plurality of rollers arranged along a traveling direction of the electrode wire, and the electrode wire is stretched in a wave shape between the rollers. The electric discharge machine according to claim 1.