JP2000126939A - Electric discharge machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable both works of contour work using a pipe or bar-shaped electrode and form work using a form electrode by providing a guide member for guiding the pipe or bar-shaped electrode installed on a head and a guide position changing means for retreating the guide member from the work part. SOLUTION: After performing roughly removing work by a form electrode on a metal mold, when performing contour work by a pipe electrode 1 and hole work, an electrode guide 5 and a guide arm 6 are retreated from the work part by a horizontal driving mechanism 7 and a vertical moving mechanism 8, and the form electrode is set to perform the roughly removing work. Next, in a state of positioning the electrode guide 5 and the guide arm 6 in the work part by the horizontal driving mechanism 7 and the vertical moving mechanism 8, a contour shape is worked. In that case, work is performed in a state of always holding the pipe electrode 1 by the electrode guide 5 provided on the guide arm 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing electrical discharge machining of a workpiece using a simple electrode.

[0002]

2. Description of the Related Art FIG.
1 shows the principle of a conventional electric discharge machining apparatus using a simple-shaped electrode disclosed in Japanese Unexamined Patent Application Publication No. H10-163, etc. In the figure, 1 is a pipe-shaped electrode attached to the head 13, 2 is a workpiece, 3 is a processing power supply, and 4 is an electrode 1 for the head 13.
Is a rotation device for rotating the electrode 5, 5 is an electrode guide for guiding the pipe-shaped electrode 1, and 6 is a guide arm for holding the electrode guide 5.

In the above conventional example, a voltage is applied between an opposing electrode and a workpiece, and a feed of a Z-axis direction component for correcting a consumption amount in a longitudinal direction of the electrode is combined with a feed in a horizontal direction (XY direction). By performing the processing of the contour while performing, the processing can be performed in a state where the electrode shape is settled in a steady state, and a desired contour shape can be obtained. Processing is performed while the pipe electrode 1 is always held by the electrode guide 5 provided on the guide arm 6.

[0004]

A conventional electric discharge machine using a simple shape electrode is configured as described above.
Since the electrode guide holding the pipe electrode and the guide arm holding the electrode guide are fixed and cannot be evacuated from the processing portion, the processing is performed using a pipe-shaped electrode or a rod-shaped electrode to obtain a desired contour shape. The processing is limited to the so-called creation processing, and there has been a problem that the transfer processing (the conventional general engraving discharge processing) using the form electrode becomes difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. In electric discharge machining for performing contour machining while rotating a simple-shaped electrode, contour machining using a pipe or rod-shaped electrode is performed. An object of the present invention is to provide an electric discharge machine which enables both forming and forming processes using a forming electrode, and which has remarkably improved productivity.

[0006]

An electric discharge machining apparatus according to the present invention comprises a guide member for guiding a pipe or a rod-shaped electrode attached to a head, and a guide position changing means for retracting the guide member from a machining portion. It is.

[0007] The electric discharge machining apparatus according to the present invention comprises:
It is provided with a control device that controls switching between contour processing using a pipe or rod-shaped electrode and forming processing using a forming electrode.

[0008] The electric discharge machining apparatus according to the present invention comprises:
The guide position changing means includes a horizontal drive mechanism for driving the guide in the horizontal direction and a vertical drive mechanism for driving the guide in the vertical direction.

Further, the electric discharge machining apparatus according to the present invention comprises:
The apparatus is provided with guide diameter switching means that can switch a plurality of guides by a guide horizontal drive mechanism.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a first embodiment of the present invention, in which 1 is a pipe-like electrode, 2 is a workpiece, 3 is a machining power supply, 4 is a rotating device for rotating the electrode 1, and 5 is a pipe-like electrode. An electrode guide for guiding the electrode 1; a guide arm 6 for holding the electrode guide 5; a horizontal drive mechanism 7 for driving the guide arm 6 in the horizontal direction; a vertical drive mechanism 8 for driving the guide arm 6 in the vertical direction; Is a head for mounting the pipe-shaped electrode 1 via the rotating device 4. The guide arm 6, the horizontal drive mechanism 7, and the vertical drive mechanism 8 constitute a guide position changing unit.

Next, the operation of the first embodiment will be described. Now, as shown in FIG. 2, one workpiece, namely,
A description will be given of a case in which the contour machining and the hole machining by the pipe electrode 1 are performed after the rough machining by the mold electrode 12 is performed on the mold 2. First, in the case of performing the forming process, the horizontal guide mechanism 7 and the vertical moving mechanism 8 retract the electrode guide 5 and the guide arm 6 from the processing portion and set the forming electrode 12 as shown in FIG. To perform roughing. Next, when performing contour machining and hole machining, as shown in FIG.
In addition, the contour shape is processed with the electrode guide 5 and the guide arm 6 being positioned by the vertical movement mechanism 8. At this time, the pipe electrode 1 always has the guide arm 6
The processing is performed while being held by the electrode guide 5 provided in the above.

Embodiment 2 FIG. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 shows a second embodiment of the present invention.
In the figures, 1 is a pipe-shaped electrode, 2 is a workpiece, 3 is a machining power supply, 4 is a rotating device for rotating the electrode 1, 5 is an electrode guide for guiding the pipe-shaped electrode 1, Reference numeral 6 denotes a guide arm for holding the electrode guide 5, reference numeral 7 denotes a horizontal drive mechanism for driving the guide arm 6 in the horizontal direction, and reference numeral 8 denotes a vertical drive mechanism for driving the guide arm 6 in the vertical direction, similarly to the first embodiment. Arm 6, horizontal drive mechanism 7,
The vertical drive mechanism 8 constitutes a guide position changing unit. 9 is a control device, 10 is a machining servo control device that is provided inside the control device 9 and controls machining feed servo according to a machining method, and 11 is also provided inside the control device 9 and is consumed in the electrode longitudinal direction in contour machining. Is a head for mounting the pipe-shaped electrode 1 via the rotating device 4.

Next, the operation of the second embodiment will be described. As in the case of the first embodiment, when performing the forming process, the horizontal drive mechanism 7 and the vertical moving mechanism 8 retract the electrode guide 5 and the guide arm 6 from the processing portion and set the forming electrode. To perform roughing. At this time, the machining servo control device 10 performs machining servo (software servo) using an algorithm for forming the entire mold.
And processing is performed. In general, in the die forming, it is necessary to instantaneously perform electrode back in response to the occurrence of a short circuit between an electrode and a workpiece. Therefore, it is necessary to perform a servo with high feedback loop gain and high response. In addition, the electrode wear correction control device 11 locks the wear correction function so that the electrode wear correction is not performed for the total die machining.

Next, when performing contour processing and hole processing, the contour shape is processed while the electrode guide 5 and the guide arm 6 are positioned by the horizontal drive mechanism 7 and the vertical movement mechanism 8. At that time, the processing is performed while the pipe electrode 1 is always held by the electrode guide 5 provided on the guide arm 6. In contour machining, if the electrode back is performed excessively against the occurrence of a short circuit between the electrode and the workpiece, the machining speed becomes slow. Therefore, the feedback loop gain is reduced and servo with appropriate feedforward is performed. Further, the electrode wear correction control device 11 performs the processing while performing the wear correction so that the correction feed component of the wear in the longitudinal direction (Z direction) of the electrode is automatically added to the movement in the XY directions.

Further, as shown in FIG. 6, a plurality of electrode guides 5a, 5b, 5
c, 5d, and the electrode guide 5
By performing the switching drive of a, 5b, 5c, and 5d, processing with high productivity using electrodes having a plurality of diameters is possible.

[0016]

As described above, according to the present invention, there is provided a guide member for guiding a pipe or a rod-shaped electrode, and a guide position changing means for retracting the guide member from the processed portion, and retracting or returning the guide member from the processed portion. By doing so, both contour processing using pipe or rod-shaped electrodes and total forming processing using full-form electrodes are performed, so combined processing combining contour processing, fine hole processing, and multi-purpose processing Can be easily performed, and there is an effect that an electric discharge machining apparatus in which productivity of mold processing is remarkably improved can be obtained.

Further, according to the present invention, a guide member for guiding a pipe or a rod-shaped electrode, a guide position changing means for retracting the guide member from a processing portion, a contour processing using the pipe or a rod-shaped electrode, and a complete electrode A control device for controlling the switching between the two processes of the die forming using the guide member, and the guide member is evacuated or returned from the processing portion, and by switching the processing control, the pipe or rod-shaped electrode is formed. Since both the contour processing used and the forming processing using the forming electrode are performed, the composite processing combining the forming processing, the contour processing and the fine hole processing, the multi-purpose processing can be easily performed, and each processing method can be performed. The efficiency of the electric discharge machining apparatus can be further improved, and the productivity of the die machining can be remarkably improved.

According to the present invention, the guide position changing means includes a horizontal drive mechanism for driving the guide in the horizontal direction, and a vertical drive mechanism for driving the guide in the vertical direction.
By moving the guide in the horizontal and vertical directions, processing is performed while switching between contour processing using pipes or rod-shaped electrodes and forming processing using forming electrodes. In addition, there is an effect that an inexpensive and compact electric discharge machine capable of performing complex machining combining thin hole machining and multipurpose machining can be obtained.

Further, according to the present invention, there is provided a guide diameter switching means capable of switching a plurality of guides by a guide horizontal drive mechanism, and by moving the guides in the horizontal direction, machining is performed while switching the plurality of guides. Since it is performed, there is an effect that an electric discharge machining apparatus with significantly improved productivity in contour machining and fine hole machining can be obtained.

[0020]

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a first embodiment of the present invention.

FIG. 3 is a diagram illustrating a first embodiment of the present invention.

FIG. 4 is a diagram illustrating a first embodiment of the present invention.

FIG. 5 is a diagram illustrating a second embodiment of the present invention.

FIG. 6 is a diagram for explaining a third embodiment of the present invention.

FIG. 7 is a view showing a configuration of a conventional electric discharge machining apparatus.

[Explanation of symbols]

Pipe-shaped electrode, 2 workpiece, 3 processing power supply, 4 rotating device, 5 electrode guide, 6 guide arm, 7 guide arm horizontal drive mechanism, 8 guide arm vertical drive mechanism, 9
Control device, 10 Machining servo control device, 11 Electrode wear correction control device, 12 Form electrode, 13 Head.

Claims (4)

[Claims] 1. An electric discharge machine for machining a workpiece by applying a voltage between an opposing electrode and the workpiece, comprising: a guide member for guiding a pipe or rod-shaped electrode attached to a head; and the guide member. Electrical discharge machining device comprising: a guide position changing means for retracting a workpiece from a machining portion. 2. An electric discharge machining apparatus according to claim 1, further comprising control means for controlling switching between contour machining using a pipe or rod-shaped electrode and forming machining using a forming electrode. . 3. The apparatus according to claim 1, wherein the guide position changing means includes a horizontal drive mechanism for driving the guide in the horizontal direction and a vertical drive mechanism for driving the guide in the vertical direction.
An electric discharge machining device according to claim 2. 4. The electric discharge machining apparatus according to claim 3, further comprising guide diameter switching means for switching a plurality of guides by a guide horizontal drive mechanism.