JPS60259319A - 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 for servo feeding for work into a working-liquid tank, thus permitting the electrode and the workpiece to be installed outside the apparatus. CONSTITUTION:On a working board 31, a workpiece 7 is installed onto the lower plate 20 of a working unit 5, and a synthetic type electrode 6 is installed onto a movable plate 22. The working unit 5 is suspended by the hoist 14 of a crane 3 and lowered into a working tank 4 through the turning of an arm 13, and a conductor 46 installed around the peripheral edge of an upper plate 21 and a conductor 45 contact in slidable ways, and an electric circuit is formed between a terminal 44, electrode 6, and the workpiece 7. Then, electric discharge machining is carried-out by feeding the workpiece by a servomotor 24. With such constitution, the workpiece and the electrode can be mounted and demounted outside the apparatus, and a plurality of workpieces can be easily handled.

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. The workpiece is machined by performing relative machining feed between the electrode and the workpiece, and this type of electrical discharge machining apparatus generally includes a head and a bed installed inside the head. A processing tank equipped with a mounting table on which the workpiece is placed, a processing tank for storing processing fluid, a column erected on the head or on the bed side, and a column supported by the column and extending toward the mounting table side on the bed. a machining nod or arm provided on the mounting table; a processing head feed and servo control device equipped with an electrode for relative machining feed in the opposite direction to the workpiece on the mounting table; A cross slide table with a controlled feed device for positioning or processing feed in a horizontal plane perpendicular to the opposing direction, and a processing power supply device were provided.

However, when processing a workpiece using a large total machining electrode, it is necessary to increase the size of the processing head, arm, column, etc. that support the electrode, and furthermore, it is necessary to increase the size of the processing head, arm, column, etc. The drive mechanism for machining feed must also have a high output, which increases the weight and increases the size of the entire device, making it impossible to control the machining feed with high precision and reducing machining speed response. There are also problems in that the desired machining accuracy cannot be obtained, and only one workpiece can be machined at the same time, and the installation of large electrodes and workpieces requires time for positioning, resulting in poor equipment operation efficiency. There was also a problem.

[Problem that the invention seeks to solve]

The present invention has been made based on the above-mentioned viewpoints, and an object of the present invention is to enable workpieces and electrodes to be attached outside the apparatus main body, to simultaneously process and set up multiple workpieces, It is an object of the present invention to provide a new electric discharge machining device that can obtain highly accurate machining feed and therefore has good operating efficiency.

[Means for solving problems]

The gist of the present invention is to generate a pulsed electric discharge in a machining gap formed by opposing a machining electrode and a workpiece in a machining liquid in a machining tank, and to In an electrical discharge machining device that processes a workpiece by performing relative machining feed in opposing directions between the electrode and the workpiece while maintaining an appropriate gap, the apparatus comprises: a machining tank for storing machining fluid; at least one machining unit equipped with a servo machining feed mechanism to which an electrode is detachably attached and which performs relative machining feed in opposing directions between the workpiece and the electrode; and carrying the machining unit into the machining tank. The electric discharge machining apparatus is operated by a conveyance device for carrying out the work, 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 device that has a power supply circuit for machining. It consists in composing.

[Effect]

By configuring as described above, it is possible to perform high-precision machining feed and set up other workpieces in parallel with one-nok electric discharge machining. Accordingly, 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 are respectively the machining and feeding mechanisms of the machining unit in the electrical discharge machining apparatus shown in FIG. 1. FIG.

In Figure 1, 1 is a bed 2, a crane 3 which is a transport device
, processing tank 4, processing unit 5, total electrode 6, workpiece 7
, a feed control device 8 including NC control, a machining fluid 9, a machining fluid supply tank 10, and valves 11 and 11. Note that the machining power supply that supplies machining voltage pulses is omitted, and the connection terminal 44 to the power supply and the machining tank 4
A current-carrying body is provided at an appropriate position such as the peripheral wall of the main body, and is energized by fitting or sliding contact with a power-carrying element 46 described later.

Thus, the crane 3 consists of a ball 12, an arm 13, and a hoist 14. It consists of a voice 14, rollers 15, 15, a motor 16, a wire 17, a hook 18, and an operating section 19.

In FIGS. 1 and 2, the processing unit 5 includes a lower plate 20, an upper plate 21, a movable plate 22, a support feed screw 23, 23, a rotary encoder for detecting the rotation angle, feed position, and rotation speed, and a finger speed generator. Servo motor with machine etc. 24.24, bellows 25.25, bearing 26.26, holding plate 27.2
7, bracket 28.28, camp ring 29.29,
It consists of an eye bolt 30, 30, and a support arm 47 of a current-carrying current 46 for the current-carrying body 45, which has a machining power supply connection line (not shown) to the electrode 6 and the workpiece 7.

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 presser plate 2 by means of two bearing feeders 23 and 23.
7.27, the bearing feed screws 23.23 are fixed at intervals in the axial direction and are rotatably attached via bearings 26.26 attached to the lower plate 20 and the upper plate 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 connected to the upper plate 21 via a bracket 28.28. The output shafts 24a, 24a of the servo motors 24.24 are connected to the bearing feed screws 23.23 by couplings 29.29, and the upper plate 21 has eye bolts 30.3 for slings.
0 is attached, and between the lower plate 20 and the movable plate 22 there is a hero's 25 which is extendable and retractable with the bearing feeder 23 as the central axis.
．． 25 is attached, and the workpiece 7 is attached to the lower plate 20.
is mounted, and a total electrode 6 is attached to the movable plate 22.

Next, the function and work operation 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 total electrode 6 is attached to the movable plate 22 facing the workpiece 7.

Next, a sling is attached to the eye bolt 30.30 attached to the upper plate 21 of the processing unit 5 by a wire (not shown) of an appropriate width and length to the hook 18 of the hoist 14 of the crane 3. Press the switch to lift the machining unit 5, rotate the arm 13 around the ball 13 of the crane 3, move the hoist 14 along the arm 13, and move the machining fluid 9 into the machining tank 4, where the machining fluid 9 is stored in advance, if necessary. Lower it and place it. In this case, the conductor 46 at the tip of the arm 47 provided at an appropriate position on the circumferential edge of the upper plate 21 fits or slides into contact with the conductor 45 provided in the processing tank 4, and the terminal 4
4, the electrode 6, and the workpiece 7 so that a predetermined current is applied.

After that, a connector (not shown) is attached and wired from the control device 8 to the servo motor 24, 24 of the processing unit 5, and a connection terminal 44 and a current carrying body 45 are connected from the power supply device (not shown).
, and a total electrode 6 attached to the movable plate 22 via a conductor 46 and a power supply connection line (not shown), and a lower plate 2.
The wires are connected so that a voltage pulse is supplied between the workpieces 7 attached to the wires.

When the operation button of the electric discharge machining device 1 is pressed after the above-mentioned operator setup is completed, 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 operates. The servo motors 24.24 are rotated synchronously, and the output shafts 24a, 24a of the servo motors 24.
．． The left and right bearing feeders 23, 23 are rotated via the shaft 29, the movable plate 22 is raised and lowered, and the total electrode 6 is opposed to the workpiece 7 with a predetermined gap, and there is a gap between them. A voltage pulse is supplied from the power supply, and machining progresses due to discharge erosion caused by this.

During the above electric discharge machining, the valve 11 is removed from the machining fluid supply tank 1o.
．． 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, reference numeral 3 indicates a processing unit showing another embodiment of the processing unit 5. In FIG. Therefore, the processing unit 31
For example, lower plate 32, upper plate 33, movable plate 34, support guide shaft 35
．． 35, Bush 3B, 36, Feed screw 37.37, Servo motor 24.24, Bellows 38.38, Hair ring 39.39, Nut 40.40, Bracket 41.4
1. Bevel gear 42.42.43.43, eye bolt 3
0.30, and an arm 47 having a conductor on the tip side.

The mechanism and configuration of the processing unit 5 is that the lower plate 32 and the upper plate 33 are connected to the support guide shaft 3 by two support guide shafts 35 and 35.
5.35, and are fixed by screwing nuts 39.39 onto the G parts 35a, 35a.
Bearing 38 attached to lower plate 32 and upper plate 33
．． A feed screw 37.37 is rotatably attached to the feed screw 37.37 through a support guide shaft 35. 35 through bushings 36.36, and is guided to the top plate 33 through brackets 1-41.41.
The servo motors 24.24 are attached, and the bevel gears 41.41 provided on the output shafts 24a, 24a of the servo motors 24.24 are meshed with the hel gears 42.42 provided on the feed screws 37.37. Cage, upper plate 3
An eye bolt 30.30 for the sling is attached to 3, and a bellows 38.3 that can be expanded and contracted between the lower plate 32 and the movable plate 34 around the support guide shaft 35 and the feed screw 37.
8 is attached, the workpiece 7 is placed on the lower plate 32, and the total electrode 6 is attached to the movable plate 34.

Next, the operation of the machining unit 31 will be explained.

When the operation button of the electric discharge machining device 1 is pressed after the same setup as in the above embodiment is performed, the machining unit 31 receives a synchronized drive signal from the control device 8 to the left and right servo motors 24, 24. The left and right servo motors 24, 24 are rotated in synchronization, and the Hebel gear right 41 provided on the output shafts 24a, 24a and the Hebel gear 41 engaged therewith are rotated synchronously.
2.42, the left and right feed screws 37.37 are rotated, the movable plate 34 is raised and lowered, and the total electrode 6 or the workpiece 7 are opposed to each other with a predetermined gap maintained between them. Voltage pulses are supplied from a known power supply device (not shown), and machining progresses due to discharge erosion caused by the voltage pulses.The configuration of the present invention is not limited to the above embodiments. For example, the support feed screw 23 of the processing unit 5.31
, the feed screw 37, and the support guide shaft 35 may be three or four.On the other hand, a conveying 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. Structure for carrying out processing - It may be closed, or it may be arranged as a large processing tank using a transport device such as an overhead crane, and a plurality of processing units may be arranged in the processing tank to carry out processing. A control device 8 and each servo motor 24, 24 having a rotation encoder, speed detector, etc.
The electrode connection between the two is configured such that the number of energizing channels 46 connected to the current-carrying body 45 connected to the processing power supply is increased so that the connection is made at the same time as the processing unit is installed.
The current-carrying body and the current-carrying element 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 the lower plate 20. Also, the workpiece 7 may be positioned on the lower plate 20 in the horizontal X-Y axis direction and can be controlled by servo feed, or may be installed on a loss slide table, and the shape and dimensions of each component may be etc. can be freely set δ1 within the scope of the purpose of the present invention.
Any modifications may be made, and the present invention encompasses all of them.

〔Effect of the invention〕

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

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the electrical discharge machining apparatus according to the present invention, and FIGS. FIG. 2 is a partial cross-sectional view showing one embodiment of the invention. i −−−−−−−−−−−−−−−−−−−−− Electric discharge machining device 2 −−−−−−− ':' −−−−−−−=
−Head 3−−−−−−−−−−−−−−−
−−=−Crane 4−−−−−−−−−−−−−−−
---------Processing tank 5.31-------
−・−−1−−Adding unit 6・−1−−・−・−・−
・--11--------General electrode 7・----1-
・・−−−−1−−−−−−−−−−−−−−Workpiece 8・・−−−−−−−・・−−−−1−−−・−11−
---Control device 9-----
---1 Processing liquid 10-・---------11--------
-------- Machining fluid supply tank 11---1---
−−−−−−−−−−−−−−−m−Valve 12・−
−−−−−−−−−−−−−−−−−−−−−−−−−−
Paul 13------------------
--------Arm 14------------
−−−−'−−−Hoist 15・−−−−−−−−−
111---・----11---Roller 16・----
----------1----------------
−・−Wire 18−・−−−−1−・−・−−−−1−
−−−−−・−−−−Hook 19−−−−−−−−−
−−−・−−−−−−−−・−Operation section 20.32・−
m----・-----------11111 lower plate 21.3
3-1------------------------------- Upper plate 2
2.34---1・---------1------
Movable plate 23----------------
・---Single bearing feed screw 24------
---------------- Serpomo, -ta 25.38
−−−−−−−−−Bellows 26.39−−−−− =
---------Hair ring 27-----E・-1--Press plate 28.41--------
---Bracket 29-----
-----Coupling 30----1------
-----Eye bolt 35------------
---One bearing guide shaft 36---------'----
−−−Butshu 37−−−−−−−−−−−−−−
−−−−1−−Feeding 40−−−−−−−−
--Nuts 42.43---------
Bevel gear patent applicant Inoue Japanx Research Institute Agent (7524) Mogami Shotabe 5...... Processing unit 20...
- Lower plate 21... Upper plate 22... Movable plate 23... - Support feed screw 24... Servo motor 31... Processing unit 32... ...Lower plate 33...Top plate 34...Movable plate 24...Servo motor 35...Bearing guide shaft 37... Feed screw figure 3

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 machining gap is maintained appropriately. In an electrical discharge machining device that processes the workpiece by performing relative machining feed in opposite directions between the electrode and the workpiece, the workpiece and the machining electrode are detachably attached to a machining tank that stores machining fluid. at least one machining unit attached to the workpiece and equipped with a servo machining feed mechanism that performs relative machining feed between the workpiece and the electrode; a conveyance device that carries the machining unit into and out of the machining tank; The electric discharge machining described above, characterized in that it comprises a servo control device connected to the machining feed mechanism of the machining unit carried into the machining yard and controlling the machining feed, and a power supply device having a power supply circuit for machining. Device.