JPS59196126A - Machining center for electric discharge machining - Google Patents

Abstract

PURPOSE:To execute unmanned operation for a complicated work by guiding a wire electrode by a desirable electrode guiding tool and carrying-out working by utilizing the contours matching the guiding pass. CONSTITUTION:A machining center for electrical discharge machining is equipped with an electrical discharge machining apparatus 1, tool magazine 2 into which electrode guiding tools 5 are accomodated in a prescribed array, automatic tool exchanger 3, and a central controller 4. A workpiece 25 is fixed onto a cross slide table 26, and the electric-voltage pulses for working are applied between a wire electrode 15 and the workpiece 25. The electrical discharge machining for the workpiece 25 is carried-out along the contours and with dimension by which the wire electrode 15 is guided by the electrode guiding tool 5.

Description

[Detailed description of the invention] The present invention relates to a machining center for electrical discharge machining.

In order to machine a desired shape by electrical discharge machining, it is first necessary to create a machining electrode with a shape corresponding to the desired shape. Further, since the electrodes are consumed by discharge, it is necessary to make many copies of the same shaped electrodes. For this reason, there is a problem in that electrode manufacturing is laborious and expensive.

The present invention is a machining center for electric discharge machining proposed in view of this point, and its purpose is that in order to perform machining of a desired shape by electric discharge machining, it is necessary to create a machining electrode with a shape corresponding to the machining shape. There is no need to duplicate or modify electrodes of the same shape, and there is no need to manually set the electrodes before starting machining, making it possible to perform complex machining unattended for long periods of time. Our objective is to provide processing machining centers.

The gist of this article is to provide an electrical discharge machining device equipped with a wire-shaped or belt-shaped electrode supply and recovery device;
Automatic tool changer, tool magazine, dimensions,
It is provided with a plurality of electrode guides forming electrode paths of different shapes, is housed in the tool magazine, is selected by the automatic tool changer, is attached to the machining head of the electric discharge machining device, and is returned to the magazine. When attaching the electrode guide to a plurality of electrode guides and the machining head of the electric discharge machining apparatus, the electrodes are attached sequentially through the electrode guides of the attached electrode guides along a predetermined electrode path, and An object of the present invention is to provide a machining center comprising an automatic electrode mounting device that detaches the electrode from the electrode guide before removing the electrode guide, and a central control device that controls the operation of the edge structure. .

The present invention will be explained below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the machining center according to the present invention, FIG. 2 is a schematic view of the wire electrode guide shown in FIG. 1, and FIG. 3 is an enlarged sectional view of the tip thereof. FIG. 4 is a partially cutaway front view showing an example of use of the processing belt electrode, and FIG. 5 is a side view thereof.

FIG. 1 is an explanatory diagram showing a machining center for electrical discharge machining according to the present invention, in which 1 is an electrical discharge machining device, and 2 is a plurality of electrode guide tools 5.5 necessary for electrical discharge machining housed in a predetermined arrangement. A tool magazine, 3, an automatic tool changer for transferring the electrode guide 5 between the tool magazine 2 and the electrical discharge machining device 1; 4, the electrical discharge machining device 1, the tool magazine 2, and the automatic tool change device 3; It is a central control device that automatically controls the

The electric discharge machining device 1 includes an arm 6, a rotating part casing 7 attached to the arm 6, a machining head 8, a motor 9 for rotating the machining head, a machining head rotation axis 0, and a spur gear 11.
．． 12, a bearing 13, and a nut 14, and inside the processing head 8 are wire electrodes 15, (Jt, M drums 16
, a winding drum 17, a capstan 18, a brake roller 19, a hydraulic unit 20, a hydraulic cylinder 21, a piston rod 22, a guide roller 23, and a processing head 8.
A chuck 24 and an electrode guide 5 are attached to the machine, and it consists of a workpiece 25, a cross slide table 26, and a machine f327. In addition, the arm 6 is on the front or back side of the paper of the drawing,
Alternatively, the cross slide table 26 may be extended from a column (not shown) provided vertically on or on the side of the machine stand 27 on the left or right end side, or further on the table 26.
It is installed so that it can be raised and lowered in close proximity to and separated from the surface.

Thus, the electrode guide 5 that guides the wire 15 into a desired shape is detachably attached to the chuck 24 of the processing head 8. The wire electrode 15 is inserted into the processing head 8. The wire electrode 15 is supplied from the supply drum 16, moves through the electrode guide 5 in a U-shape, and is wound onto another winding drum 17 in the 'r processing head 8. 18 and the brake roller 19, the wire electrode 15 is moved with the electrode guide 5 with the required tension.

The workpiece 25 is fixed on a cross slide table 26 and is movable in the X and Y planes on a machine stand 27, both of which are driven and controlled by signals from a numerical control device (not shown). be done. Further, a machining voltage pulse is applied between the wire electrode 15 and the workpiece 25, and electrical discharge machining is performed by supplying machining fluid. In this case, if you want to process the workpiece 25 by immersing it in the processing liquid, the machine
A processing tank is placed on top of the processing tank 7, and a table 26 is provided inside the processing tank.

In electric discharge machining, the workpiece 25 is machined with the wire electrode 15 guided by the electrode guide 5 in the contour shape and size.

That is, the electric discharge is generated in the entire area where the wire electrode 15 faces the workpiece 25, and machining is performed to form a guided contour shape. After the arm 6 is moved downward by driving a lift motor (not shown) to perform the required cutting process, the cross slide table 2G is numerically controlled.
5 is processed by moving relative to the wire electrode 15 on the X and Y planes in a desired shape.

The processing head 8 is rotatably attached to the lower surface of the rotating part casing 7 by a rotating shaft 10 and a bearing 13, and is rotated about the rotating shaft 10 by a motor 9 via spur gears 11, 12.

Furthermore, by operating and rotating the motor 9 during machining, the wire electrode 15 can always be directed in the machining direction, making it possible to perform not only simple straight line machining but also complex curve machining. It is only necessary to program the central control device 4 according to the shape, and arbitrary two-dimensional or three-dimensional processing can be performed by automatic control. Furthermore, if rotation is applied by the motor 9 during processing, engraving processing similar to that of the electrode with the total shape of the contour guided by the wire can be easily performed.

The automatic tool changer W3 has a rotating part 3b that is rotatably provided with respect to the body part 3a, an arm 3c that is rotatably and telescopically provided with respect to the rotating part, and an arm 3c that is rotatably provided at the tip of the arm 3c. The electrode guide 5 can be removed from the chuck 24 of the electrical discharge machining device 1 according to a predetermined program, and can be transferred to and from the tool magazine 2. There is.

When electrical discharge machining has finished machining a predetermined machining area, the electrode guide 5 is removed and attached to the machining head 8.
When automatically attaching and detaching from the chuck 24 of The guide roller 23 at the tip of the wire electrode 22 is moved from the position shown by the solid line to the position 23' shown by the dotted line, and the wire electrode 15 is removed from the electrode guide 5 and left in the released state. The electrode guide 5 is removed and automatically replaced with another electrode guide 5 in the tool magazine 2, and a new electrode guide 5 is attached to the chuck 24 of the machining held 8, and then transferred to the hydraulic cylinder via the hydraulic unit 2o. 21 causes the guide roller 23 at the tip of the piston rod 22 to move.
By returning the wire electrode 15 from the position 23' shown by the dotted line to the position shown by the solid line, the wire electrode 15 is brought into sliding contact with the predetermined position of the newly installed electrode guide 5, and electric discharge machining is started again.

As explained above, the above-mentioned series of operations are performed in accordance with a program input into the computer of the central control unit 4 that centrally controls the entire machining center. still,
In the above case, if the rotation of the processing head 8 around the rotating shaft 10 is a reciprocating rotation within about 2 to 4π radians, one or both of the supply drum 16 of the wire electrode 15 and the winding drum 7 For example, it can be provided in a fixed part such as the column (not shown).

As shown in FIGS. 2 and 3, the electrode guide tool 5 of the electric discharge machining device 1 is plate-shaped, and the width of the tip machining portion is slightly wider than the wire diameter of the wire electrode 15 so that it does not interfere with machining. It is configured as follows.

4 and 5 are a partially cutaway front view and a side view of the belt electrode for processing without showing an example of its use, 28 is a belt electrode, 29 is an electrode guide tool for guiding the belt electrode into a desired shape, It can be detachably attached to and removed from the opening and opening 31 of the processing heel 30. The belt electrode 28 is supplied from a supply drum 32 in the processing head 30 , moves through the electrode guide 29 in a U-shape, and is wound onto another winding drum 33 in the processing head 30 . The reference numeral 34 indicates a gap roller for winding and moving the belt electrode 28, and the reference numeral 35 indicates a brake roller, between which the belt electrode 28 is held under the required tension (electrode guide 29).
is moved along the surface shape. As shown in the figure, the electrode guide 29 is plate-shaped, and the width of the processed portion at the tip is slightly wider than the width of the belt electrode 28, so as not to interfere with the processing.

Electric discharge machining using each of the electrodes described above is performed in the same manner as electric discharge machining using conventional clamp electrodes or simple rod-shaped electrodes.

Since the present invention is configured as described above, in accordance with the present invention, the wire electrode is guided by a desired electrode guide,
By processing using the guided contour, electrodes of any shape or multiple shapes can be easily obtained automatically.
Since this is processed by controlling movement in 2-, 3-, or multi-axis directions, it is possible to perform 3-dimensional processing that is equivalent to or better than when using conventional clamping electrodes, and is extremely effective. Furthermore, the wire electrode is configured such that the electrode guide is supplied from the supply drum and then wound onto another winding drum and moved, so even if the wire electrode is worn out due to electrical discharge, new wire is always supplied to the machining area. Therefore, the contour shape of the processing electrode does not deform due to wear and tear, and processing can be maintained semi-permanently with high precision. Since various types of electrode guide tools can be selected and replaced at will, it can be said that it is a highly useful machining center that can perform complex machining corresponding to the machining shape unattended for long periods of time.

Note that the configuration of the present invention is not limited to the above-mentioned embodiments, and wire electrodes and belt electrodes can be used together.
The design of the rotating device, the automatic electrode mounting device, etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a machining center according to the present invention, FIG. 2 is a side view of the wire electrode guide shown in FIG. 1, FIG. 3 is an enlarged sectional view of the tip thereof, Fig. 4 is a partially broken pressure surface view showing an example of use of the processing belt electrode, and Fig. 5 is a side view thereof. i −−−−−1・・−・−1−−−−−−−−−−−
Electrical discharge machining equipment 2 ------- To ------- 1 ---- Old - Tool magazine 3 -------
−1 Automatic tool changer 4−−−−−−1−−−−・−−
11------Central control unit 5.29...------
−−〜−−−・−Electrode guide 6−−−−−−−−−−
---, -------- Arm 7 ---
−−−−−−−−−−−−Processing head 9−−−−−−,
, -----------11----Motor 10----
−−−−−−−−−−−−−− All moving shafts 11.12−−
−−−−−−−−−−Spur gear 13−−−−−−,−−
−−−−−−−−− Bearing 14− ・−1−−−
−−−−−−−・−Natsu 15−−−−1・−−−−
-1--Wire electrode 16.32--1--Supply drum 17.33-
-------------- Winding drum 18.34
・－－－－－－１－－－－－－－－－－Capsun 1
9. To 35 -------・---------11---Brake roller 20・---------・---11------
−−・−Hydraulic unit 21−−−1−−−−−・−1−
−−・−1−−−−・−Hydraulic cylinder 22−−−−−
−−−−−−−−−−−・Piston mouth・Groove 23−−
------
−−−−−−−−−−・−・−Workpiece 26−−−・−
------ 1--Belt electrode patent applicant
Inoue Japanx Research Institute Agent (7524)
Mogami Shota part Fig. 5 Fig. 2

Claims (1)

[Scope of Claims] A machining center for electrical discharge machining comprising the components described in the following items fa1 to ff1. (a) An electrical discharge machining device equipped with a wire-shaped or belt-shaped electrode supply and recovery device. (b) Automatic tool changing device. (C), tool magazine. (d) A plurality of electrode guides forming electrode paths each having a different size and shape are provided, and the electrode guides are housed in the tool magazine, and are selected by the automatic tool changer and used for machining in the electrical discharge machining apparatus. multiple electrode guides that are attached to and returned to the magazine. (e) When attaching the electrode guide to the machining head of the electric discharge machining apparatus, the electrode is attached sequentially through the electrode guides of the attached electrode guide and along a predetermined electrode path, and An automatic electrode mounting device that detaches the electrode from the electrode guide before removing the electrode. (f) a central control unit for controlling the operation of all the above components;