JPS60259320A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To permit the handling of a number of workpieces by installing a workpiece and a working electrode in demountable ways and carrying-in and -out a working unit equipped with a two-axes direction servo work feeding mechanism into a working-liquid tank, thus permitting the electrode and the workpiece to be mounted and demounted outside the apparatus. CONSTITUTION:On a working board 36, a workpiece 7 is installed onto the lower plate 20 of a working unit 5, and a synthetic type electrode 6 is installed oppositely to the workpiece 7 onto a table 33 which shifts in the Y-axis direction. Then, the working unit 5 is suspended by a crane 3 and lowered into a working tank 4 by a hoist 14 through the turning of an arm 13, and conductors 52 and 51 are allowed to contact in slidable ways, and an electric circuit is formed between a terminal 50, electrode 6, and the workpiece 7. Then, electric discharge machining is carried-out by feeding the workpiece in the X and Y-axis directions by servomotors 24, 34, and 35, and controlled by a controller 8. With such constitution, the workpiece and the electrode can be mounted and demounted outside the apparatus, and a plurality of workpieces can be handled, thus permitting the working operation with high accuracy and high operation rate.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to electrical discharge machining equipment.

[Conventional technology]

Conventionally known electric discharge machining equipment generates a pulsed discharge within a machining gap formed by opposing a machining electrode and a workpiece in a machining fluid in a machining tank, and also maintains the machining gap appropriately. This type of electrical discharge machining apparatus generally includes a bed and a machine installed on the bed and inside the machine. a processing tank for storing machining liquid and equipped with a mounting table on which the workpiece is placed; a column erected on the bed or on the side of the bed; and a column supported by the column on the mounting table side of the mounting table on the bed. A processing head or arm provided in an extended manner, a processing head feed and servo control device equipped with an electrode for performing relative processing feed in opposite directions to the workpiece on the mounting table, and a processing head and a servo control device on which the mounting table is connected to the electrode. It is composed of a cross slide table with a control feeding device for positioning or processing feed in a horizontal plane perpendicular to the opposing direction, and a processing power supply device.

However, when machining a workpiece using a large total machining electrode, a machining head that supports the electrode,
The arm, column, etc. must be made larger, and the drive mechanism for processing and feeding the electrodes must also have a higher output, which increases the weight and makes the entire device larger. Because of this, it is not possible to control the machining feed with high accuracy, and the machining speed response and machining accuracy cannot be achieved as desired.In addition, only one workpiece can be machined at the same time, and large electrodes and workpieces are There is also the problem that the installation of the body requires time for positioning, which reduces the efficiency of the operation of the device.

[Problem that the invention seeks to solve]

The present invention has been made based on the above-mentioned viewpoints, and the objects of the present invention are to enable workpieces and electrodes to be attached outside the main body of the apparatus, to be able to simultaneously process and set up multiple workpieces, and to achieve high performance. It is an object of the present invention to provide a new electric discharge machining apparatus that can obtain accurate machining feed and therefore has good operating efficiency. [Means for Solving the Problems] The gist of the present invention is to provide a processing method in which a machining electrode and a workpiece are opposed to each other in a machining liquid in a machining tank. In an electric discharge machining device that generates a pulsed electric discharge and processes the workpiece by performing relative machining feed in opposite directions between the electrode and the workpiece while maintaining the machining gap appropriately, the machining liquid is At least a processing tank for storing a processing tank, a workpiece and a processing electrode detachably attached thereto, and a servo processing feed mechanism for performing relative processing feed in the X, Y, and Z axis directions between the workpiece and the electrode. 1 processing unit, a conveyance device that carries the processing unit into and out of the processing tank, and a servo control device that is connected to a processing feed mechanism of the processing unit carried into the processing tank and controls processing feed. , and a machining power supply circuit to configure an electrical discharge machining device.

[Effect]

By configuring as described above, it is possible to perform high-precision machining feed, and to set up other workpieces in parallel with electrical discharge machining of one workpiece, and if necessary, multiple workpieces can be placed in the machining bath. It is possible to provide a novel electric discharge machining apparatus in which machining units are arranged to perform efficient machining and machining fluid can be easily managed.

〔Example〕

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the electrical discharge machining apparatus according to the present invention, and FIGS. 2 and 3 respectively show the machining feed mechanism of the machining unit in the electrical discharge machining apparatus shown in FIG. FIG. 3 is a partial cross-sectional view showing one embodiment.

In FIG. 1, l is a bed 2, a transport device 11, a lane 3, a machining tank 4, a machining unit 5, a total amount electrode 6, a workpiece 7, a feed control device 8 including No. control, and a machining liquid 9. , an electric discharge machining apparatus consisting of a machining fluid supply tank 10 and a valve 11.11. Note that the machining power supply that supplies voltage pulses for electrical discharge machining is omitted, and the connection terminal 50 to the power supply,
And a communication electronics 5, which will be described later, is provided at an appropriate position such as the peripheral wall of the processing tank 4.
A current-carrying body 51 is provided by fitting or sliding contact.

Thus, the crane 3 consists of a ball I2, an arm 13 and a hoist 14. Thus, the hoist 14 consists of rollers 15.15, a motor I6, a wire 17, a hook 18 and an operating part 19.

In Figures 1 and 2, the processing unit 5, the lower plate 20, the upper plate 21, the movable plate 22, the bearing feed screw 23, 23, the rotary encoder for detecting the rotation angle, feed position, and rotation speed, and the finger speed generator Servo motor 24 with machine etc. 24, cross slide table δ, bellows part, legs, bearing 27.
27, by holding plate, edict, bracket 29. 29, Katzbringen, father, eye bolt 31. 31, and energization 52 for the current carrying body 51 having a machining power supply connection line (not shown) to the electrode 6 and workpiece 7 It consists of a support arm 53.

The mechanism and configuration of the processing unit 5 is such that the lower plate 20 and the upper plate 21 are connected to the holding plate 2 by the two supporting feed screws 23 and 23.
8.28 are fixed at intervals in the axial direction, and the support feed screws 23.23 are rotatably attached via bearings 27.27 attached to the lower plate 20 and upper @21. , a movable plate 22 is provided between the lower plate 20 and the upper plate 21 by screwing into a bearing feed screw 23.23, and a servo motor 24.24 is attached to the upper plate 21 via a bracket 29.29. The output shafts 24a, 24a of the servo motors 24.24 are connected to the bearing feed screws 23.23 by means of compression rings 30.30, and eye bolts 31.31 for slinging are attached to the upper plate 21. A bellows 26.2 is provided between the lower plate 20 and the movable plate 22, which is extendable and retractable around the support feed screw 23 as a central axis.
6 is attached, a workpiece 7 is placed on the lower plate 2o, a cross slide table 25 is provided on the movable plate 22, and a clamping electrode 6 is attached to it.

The cross-slide l table 25 is attached to the X-axis direction moving table 32 via two guide rails (not shown) on the movable plate 22.
is provided, and a Y-axis direction moving table 33 is provided to the table 32 via two guide rails (not shown),
X-axis direction feed servo motor 34 provided on the movable plate 22
, the X-axis moving table 32 is moved via an X-axis feed screw (not shown), and the Y-axis moving servo motor 3 provided on the
5, the Y-axis direction moving table 33 is moved via a Y-axis direction feed screw (not shown). Incidentally, the servo motors 34 and 35 also include the servo motor 24,
Similar to the above, it is equipped with a rotary encoder, finger speed generator, etc. for detecting the rotation angle, feed position, and rotation speed.

Next, the functions and work operations of the electric discharge machining apparatus 1 will be explained.

First, the worker first places the first
The workpiece 7 is placed on the lower plate 20 of the processing unit 5 shown by the dashed line in the figure, and the clamping electrode 6 is attached to the Y-axis direction moving table 33 facing the workpiece 7.

Next, the eye bolt 30J30 is attached to the hook 18 of the hoist 14 of the crane 3 to the upper plate 21 of the processing unit 5 with a wire (not shown) of an appropriate thickness and length, and the sling is operated. The pushing processing unit 5 is lifted up, the arm 13 is rotated around the ball 13 of the crane 3 as the central axis, the hoist 14 is moved along the arm 13, and it is lowered into the processing tank 4 in which processing fluid 9 is stored in advance as required. Place it. In this case, the conductor 52 at the tip of the arm 53 provided at an appropriate position on the circumferential edge of the upper plate 21 fits or slides into contact with the conductor 51 provided in the processing tank 4, so that the terminal 50, the electrode 6, and the workpiece are A predetermined energization is performed during the period of 7.

After that, a connector (not shown) is attached and wired from the control device 8 to the servo motor 24, 24, 34, 35 of the processing unit 5, and a connection terminal 50 is connected from the power supply device (not shown).
, a saw clamp type electrode 6 is attached to the table 33 of the movable plate 22 via the current carrying body 51 and the current carrying element 52, and a power supply connection line (not shown), and the workpiece 7 attached to the lower plate 20.
Wire the wires so that a voltage pulse is supplied between them.

After the above-mentioned operator setup is completed, when the operation button of the electric discharge machining device 1 is pressed, the machining unit 5 receives a synchronized drive signal from the control device 8 to the left and right servo motors 24 and 24, and the machining unit 5 The servo motors 24.24 are rotated synchronously, and the output shafts 24a, 24a of the servo motors 24.
．． 29, the left and right support feed screws 23.23 are rotated, the movable plate 22 is raised and lowered, and drive signals are sent from the control device 8 to the servo motors 34.35 in the X-axis and Y-axis directions, respectively. The slide table 5 is moved, the clamping die electrode 6 is made to face the workpiece 7 with a predetermined gap maintained, and a voltage pulse is supplied between the two from the power supply device, and the machining progresses due to the discharge erosion caused by this. It is supposed to be done.

During the above electrical discharge machining, the valve 11 from the machining fluid supply tank 10
．． A machining fluid 9 is supplied through the machining tank 11 into the machining tank 4 so that a desired constant level of the fluid is maintained.

In FIG. 3, numeral 36 is a processing unit showing another embodiment of the processing unit 5. Therefore, the processing unit 36
For example, the lower plate 37, the upper plate 38, the movable plate 39, the support guide shaft 40
．． 40, bushing 41.41, feed screw 42.42, servo motor 24.24, cross slide 25 similar to the above
, bellows 43.43, bearing 44.44, nut 45.45, bracket 46.46, bevel gear 47,
'47, 48, 48, an eye port 31, 31, and an arm 53 having a conductor on the tip side.

The mechanism and configuration of the processing unit 5 is that the lower slope wing and the upper plate 38 are connected to the support guide shafts 40 and 40 by two support guide shafts 40 and 40.
．． 40 to the threaded portions 4Qa and 40a of the nut 45.
．． 45 are screwed together and fixed, and the bearings 44.4 are attached to the lower plate 37 and the upper plate 38.
A feed screw 42.42 is rotatably attached via the support guide shaft 4, and a movable plate 39 is provided between the lower plate 37 and the upper plate 38 and is screwed onto the feed screw 42.42.
0.40 through bushings 41.41, and a servo motor 24.24 is attached to the upper plate 38 through a bracket 46.46.
．． Bevel gears 47.47 provided on the output shafts 24a, 24a of 24 are meshed with bevel gears 48.48 provided on the feed screws 42.42, and the upper plate 38 has eye bolts 31.31 for slinging. It is installed,
Bellows 43, 43 are attached between the lower plate 37 and the movable plate 39, and are extendable and retractable around the support guide shaft 40 and the feed screw 42. The workpiece 7 is placed on the lower plate 37, and the movable A cross slide table 5 similar to that described above is provided on the plate 39, and a total electrode 6 is attached to the cross slide table.

Next, the operation of the processing unit 36 will be explained.

When the operation button of the electric discharge machining apparatus 1 is pressed after the same setup as in the above embodiment is performed, the machining unit 36 receives a synchronized drive signal from the control device 8 to the left and right servo motors 24, 24, and The left and right servo motors 24.24 are rotated synchronously, and the bevel gears 47.47 provided on their output shafts 24a, 24a and the bevel gear 48 meshing with the bevel gears 47.47.
．． The left and right feed screws 42 and 42 are rotated via 48,
The movable plate 39 is raised and lowered, drive signals are sent from the control device 8 to the servo motors 34 and 35 in the X-axis and Y-axis directions, the cross slide table 25 is moved, and the total electrode 6 is moved relative to the workpiece 7. They are opposed to each other with a predetermined gap maintained between them, and voltage pulses are supplied between the two from a known power supply device (not shown), and machining progresses due to discharge erosion caused by this.

Note that the configuration of the present invention is not limited to the above-mentioned embodiments, and for example, the structure of the processing unit 5.
The number of feed screws 42 and support guide shafts 40 may be three or four.On the other hand, a conveyance device is provided in the center, an annular processing tank is provided around it, and a plurality of processing units are arranged inside the tank to carry out processing. Alternatively, a large processing tank may be constructed in which multiple processing units/7
A feed controller 8 including NC control and each servo motor 24, 24 having a rotary encoder, speed detector, etc. may be arranged in the processing tank to perform processing.
．． The electrical connection between 34 and 35 can be made by increasing the number of contact energizing channels between the energizing body 51 and the energizing element 52 connected to the processing power source so that the connection can be made at the same time as the processing unit is installed, or by The same body and electrical current may be provided separately from the power source for processing, or may be provided outside the processing tank 4 or on the bed, or may be provided at the bottom of the processing tank 4 or on the lower plate. Further, the shape, dimensions, etc. of each component can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them.

〔Effect of the invention〕

Since the present invention is configured as described above, according to the present invention, machining speed response and highly accurate machining feed can be achieved.
Moreover, the cost of the machining feed mechanism is reduced, and machining fluid can be easily managed, so that it is possible to provide a novel electrical discharge machining apparatus that can prevent abnormal ignition due to a drop in the fluid level.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the electrical discharge machining apparatus according to the present invention, and FIGS. 2 and 3 respectively show the machining feed mechanism of the machining unit in the electrical discharge machining apparatus shown in FIG. - It is a partial sectional view showing an example. 1------------------11----Electro discharge machining device 2------------11-Bed 3
−−−−・−−−−−m−・−−−−−−Crane 4−
−−−〜−−−−−−−−・−−−m=processing tank 5.36
−1−−−−−−−−−−−E unit 6−−−−−
−−−−−−−−−−−−−−General electrode 7−−−1・
−−−−−1−−−・−−−・Workpiece 8−−−−・−
・---111---------Control device 9------
−−−−− =−−−−・−−−−m− Processing liquid 10−
・−1−−−−−−−−−−−−−−−−1−−− Machining liquid supply tank 11−−−− '−−−−−−1・−−11−−−−− Valve 12-------1・------
--11---Paul 13---------・----
---------Arm 14----------
−−−−−−−−11 Hoist 15−−−−−−−−
−−−−−−−−One roller 16−' −−−−−−−−
・---------Motor 17------------1~-----Wire, 1B-----
--“-1~-゛-77')11--------- ---
---1 operation part 20.37-------1.-
...-Lower plate 21.3B -----------
-----・-Top plate 22.39・----1-・-1--
−−−−−−−・−Movable plate 23−−−−−−−−−−−
−−−・−−1−−−−−−−Bearing feed screw 24−−
----・--
---・----Cross slide table 26.43--
−・・・−−−−−−−−1111−−Bellows 27.
44-・-----1---------・---1--Bearing 28--
-----Press plate 29.46-・------1・-
・−−1−−−Bracket 30～−−−−−−・・−−
11−−=−−−−−−−−・・Kampling 31−
・−・−−−11−−−−−−−−−−−−−−Eye Bolt 32−−−−−−−−−−−−−−・−−−−
-----x-axis direction moving table 33-----1---
----------Y-axis direction moving table 34--m
−・−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−1−−−
------・----Y-axis direction feed servo motor 40・
−11−−−−−−−−−−−−−−・−11−−
−Support guide shaft 41−−−−−−−−−−−−−−−−
−−−−−−Butshu 42−−−−−−−−−−−−
−−・−−−1−−Feeding 45・−・−−−−−−
−−m−−−・−−−−−−・−Natsu 47.48−−
−−−−−−・−−−1−−Bevel gear patent applicant Inoue Japanx Research Institute Agent (7524) Shotabe Mogami

Claims (1)

[Claims] A pulsed discharge is generated in a machining gap formed by opposing a machining electrode and a workpiece in a machining fluid in a machining tank, and the above-described process is performed while maintaining the machining gap appropriately. In electrical discharge machining equipment that performs relative machining feed between an electrode and a workpiece to machine the workpiece, a machining tank for storing machining fluid, a workpiece and a machining electrode are removably attached, and the above-mentioned at least one machining unit equipped with a servo machining feed mechanism that performs relative machining feed in the x, y, and z axis directions between the workpiece and the electrode, and a conveyance device that carries the machining unit into and out of the machining tank. The electrical discharge machining apparatus described above, comprising: a servo control device that is connected to the machining feed mechanism of the machining unit carried into the machining tank and controls the machining feed; and a power supply circuit for machining. .