JPS6062415A - Electric power supply device for electric spark machining - Google Patents

Abstract

PURPOSE:To decrease the inductance of a discharge circuit, by causing mutually inverse currents to flow through a parallel conductor wire assembly. CONSTITUTION:Mutually inverse currents are caused to flow through adjacent unit conductor wires 36a, 37a, so that the magnetic force lines of magnetic fluxes produced by the currents flowing through the conductor wires cancel each other. The inductance due to the magnetic force lines is thus decrease. A section not shown provided with a swithcing unit comprising a charge/discharge capacitor 29, a transistor 30, etc. is placed near a machining gap, so that the speed of machining is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electric discharge machining (1-transistor system 01
When machining a workpiece by denza discharge, the lead wire used in the discharge circuit of a capacitor consists of a set of many unit parallel conductive wires adjacent to 7L-f:, and this adjacent A current in the opposite direction is applied to the parallel conductors f
%1. ``A power source for electric discharge machining that uses an assembly of parallel conducting wires to reduce the inductance of a discharge circuit.''

Capacitor 1) Processing circuits using charging and discharging have the following characteristics: simple structure, narrow pulse width, and high peak value current pulses of 1q, and ease of controlling over a wide range of transistors as switching elements. In the content 4 no-discharge circuit with 1 to 4 transistor control that takes advantage of ing. (shi)leba'Fi
As shown in Publication No. 50-11931G, great efforts have been made to reduce the inductance value of the discharge circuit by using l1il IMl+ couple, thyme or ring-shaped braided copper wire, or flexible printed wiring board. Efforts have been made.

The present invention has a new improvement, so that the electrode and the workpiece are formed so as to face each other.1. : Apply an intermittent voltage pulse between 1 and 1211 with the micro gap filled with fμ through IJ11 liquid.
In the machining power supply for electric discharge machining, which performs machining by the electric discharge generated by applying power according to the control of the circuit,
i! J voltage source, and a switching element that generates the voltage pulse by converting the output electric current of the DC voltage into the voltage pulse, and the DC voltage source is charged with J. A capacitor as a DC power source and the switching element for controlling the capacitor to avoid a controlled discharge are placed closer to the machining gap.
On the other hand, if a lead wire is made up of a set of a large number of adjacent parallel unit conductors, and each of the adjacent unit conductors is branched at both ends, the unit core wires that are not adjacent to each other are connected separately. Each bundle connection end on one end side of the lead wire is connected to the electrode and the workpiece to be energized at 1 tC.
When connecting to the connecting part) (to each t!l'1 bundle connection on the other end side + Mi note: 1 nden () and the switching element connected to the phase n, each terminal connected to the phase n is connected to the other terminal) This is a power supply device for discharging which is connected to a terminal of a capacitor and a terminal of a switching element.Furthermore, each of the transistors of the "denser 1b" serving as the pseudo DC power supply is composed of a plurality of aggregates,
15 + - The number of said connectors or 1- transistors in which the connecting ends of the set of parallel conductive wires on the terminal side of the transistors are bundled into a desired number f of unit conductors that are not adjacent to each other for every 3 conductors. A bundle connection ψM corresponding to 4J' is set up to the right of the lead wire, and a current is passed in the opposite direction to each of the adjacent parallel conductors to form a 1+ connection configuration. It is made to look like a wire.

Fig. 1 is a schematic configuration diagram of an embodiment of the device according to the present invention;
The figure is a diagram for explaining the configuration of a parallel aggregate, and Figures 3 and 4 are 3
FIG. 5 is a sectional view of an assembly of IJ row conducting wires, and FIG. 5 is a sectional view of an embodiment of an assembly of parallel conducting wires.

In Fig. 1, Column 2 placed in -C1 rows 1 to 1 contains:
The upper arm 4 and lower arm 5 supporting the electrode 3 extend toward the table 9, which will be described later.

A head 6 is supported at the tip of the upper arm 4 so that it can move upwardly, and a block 7 is provided at the bottom of the head 6 to move it on a horizontal plane using a numerical control device (not shown). It is supported so that it is driven in the X and Y directions that are perpendicular to each other. The workpiece 8117 is fixed to the bull 9 and then fixed to the table 10 by the clamp plate 1 by 11.

And this table 9 is supported by Vera 1-1,
A numerical control device (not shown) moves on a horizontal plane in the
4, the electrode 3 (2) is sandwiched between a pinch roller 15 and a brake roller 16, which apply braking to give a predetermined tension.Then, it passes through an idle roller 11, changes direction, and comes into contact with a current-carrying pin 18. Trefify X7
A boat-shaped guide or die blade 19 such as the above is opposed to the workpiece 8 in red. Between the energizing bottle 18 and the applied two bodies 8, two electric currents 1i 20 J and 2 electric currents J are applied,
Under the injection of machining fluid 21, the first force cannot be applied. 1-year-old Wi-X771'1 with unevenness reduced through processing
4413 is the other boat-shaped guide or die guide 22, a plurality of guide rollers 23, 24, and a kite roller 23.
.

Installation of the capacitor and the switch element installed close to the table 9 On the f1 section 28, a charging/discharging capacitor 2 as a pseudo DC power source is placed at the position closest to the machining gap.
9 and a switching element 4j11; a control circuit 31 consisting of an oscillation circuit that controls the transistor 3o, a digital control circuit, and a processing condition setting circuit that sets the pulse width, pause period 114, peak current, etc. Set up. However, this charging/discharging condereza 29
0 Both ends 'F32.33, the terminal 32 and the terminal 34 connected to the current carrying pin 18 are connected with a lead wire 36, and the terminal 35 connected to the workpiece 8 and the terminals 1 to 30 are connected with a lead wire 37. Connection zuru. These lead wires 313 and 37 are made by combining insulated unit conductors together or appropriately bundling them into a single lead wire 38.
As shown in Fig. 5, a unit conductor C consisting of a core wire A and an insulating coating B is connected to a phase U at a flat 11.
It has a configuration in which 11 pieces are sequentially joined together in a planar shape,
Therefore, the IJ -1' line 38. ! = l, T
O) Example Fli surface view fJ, 'Q', Ni 3Ga shown in Figures 3 and 4, 37a 136b, 371
+, 36c.

37c......and 2 navy blue lead wires 36.3
Among the bundles of many unit conductors composing 7, the unit conductors of -E are arranged adjacent to each other to form a set of 11th parallel conductors, and even when the unit parallel conductors 3Ga and 37a are bundled, they do not adjoin each other. The conductor wire is never the same as the lead wire of the same navy blue as the unit conductor consisting of '+t4, for example, the lead wire 3G is lli f<L.
The conductor wires 3Ga and 36b are placed on a cylindrical pile or (
J, 7.1j Formed into a shape, bundled, or laminated to form the wire 38 of -E.

One end of the single-wood lead wire 38 constructed in this way is connected to each unit conducting wire 3Ga, 37i1, :Hil).
, 37b.

If 3C+c, 37c...... are branched respectively, one unit '6fm36a that is not adjacent to '), '6fm36a
, 36b, 3Gc....... are connected to the terminal 34 as the connecting end, and each
ll, l of non-adjacent other forces (ink anus 137a
, 371+, 37c, etc. are bundled together to the connecting end and connected to the terminal 35 (8I/"2n.The other end of the lead wire 38 connected as in A) Part 1 > l
Each unit conducting wire 36a, 37a, adjacent to 1F1
3Gl+ 137b, 36c, 37c −・
---------When branched, one of the unit conducting wires 36a, 3Gb, 3Gc, which is not adjacent to it, is...
Connect the bundled end of ... to the connection end, and connect the current limiting resistor i! :+39 to the terminal 32 of the charging/discharging capacitor 29, and the other unit conducting wires 37a, 37b, 37c not adjacent to the CLL.
・is a unit'! 'J Ijil 37 a- The capacity of the current that can flow through a tree and the direct current that flows through one transistor 30 are J:. (Bundle the power cables and connect them to the power transmitter 44i of each nearby I transistor 30.

In this way, the required number of C transistors 30 are arranged in parallel.
Charging and discharging the collector electrode of through the conducting wire 40]
Connect to terminal 33 of 9. Then, 1 to 3
The base electrode of 0 and the control circuit 31 are connected with a conductor 41.
Ru. The coaxial cable 42 connected to the terminals 32 and 33 of the charge/discharge capacitor 29 is connected to the DC power supply 20 in the bellows 1 to 1 or in a power supply box or the like provided separately from the pet 1 and the column 2.

In this invention, the charge/discharge condenser 1/29 is charged by the DC power supply 20 through the coaxial couple 42, and the processing section 3
! It acts as a pseudo DC power supply with 7p lJ connected to the i side. This charging voltage is applied to the control circuit 31 as intermittent voltage pulses by the action of a switching element consisting of transistors 30 and 1, which are in the A/A state.
-C is applied to the terminal 34 connected to the current-carrying pin 18 connected to the wire (~3) and the terminal 35 connected to the body 8 through the voltage G and 37. 1. At this time, the current is flowing through the 12 lead wires 3G and 37. The lead wire 38, which has been stopped and made into one, is a collection of parallel unit conductors, forming 4M, which is a large number of parallel single conductors adjacent to each other. It consists of 9 doors and 9 wires.

Since the directions of the currents flowing through the unit conductor 3 (ia, 37i1) are opposite to each other, the current flowing through the conductor is J, . As the lines of magnetic force cancel each other out, the inductance caused by the lines of magnetic force can be reduced.Moreover, the installation part 28 provided with switching elements such as the charging/discharging capacitor 29 and the transistors 1 to 30 (r-) can be installed with a machining gap. By installing it in close proximity, it is possible to supply a machining pulse current with a short discharge time and a large discharge peak current between the electrode and the workpiece for each discharge. ：Tsuteki】Two speeds can be improved, and in this case, by using YX7 electric (t) on the electrode.
It has the effect of preventing disconnection of the 7th electric wire.

Note that the present invention can be implemented with various modifications.

For example, the installation position of the switching element consisting of the switch 29 and 1 to the transistor 30, etc. is outside the side 9110 or rear part of the arm 9 on the bellow 1 to 1, on the table 9, or on the upper arm 4 of the arm 1b in the bellow l-1. It is sufficient that the position is always close to 113r to the machining gap such as inside the capacitor 2.
The 91"l transistor 30 should have a plurality of 6 transistors arranged in parallel.
J3, one or all of them are used by the control circuit 31 from inside A.Also, the current-carrying pins 18 connected to the X7 electrodes 3 are usually connected to both sides of the workpiece 80. (as necessary) 11 The wire electrode is provided as a passing line on the side that is energized, so in such a case, the connecting end of the lead wire 36 connected to the terminal 34 is divided into two. It's Shino.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the present invention, Fig. 2 is an enlarged view of the main parts of the invention shown in detail, and Fig. 3 is a cross-sectional view of Fig. τlj /1 diagram is A of N12 diagram
Another embodiment of the present invention is shown in FIG. 5, which is a sectional view of an embodiment of an assembly of parallel conductive wires. 3...Wire electrode 8...Wave power 1 [body 20]...Direct fAj power source 21...・Machining fluid 28... Capacitor, soothing prefecture installation part 29... Charge/discharge capacitor 30...
...Transistor 31...Control circuit 36.37...Lead wire 38...
・・・Lead wire 40.41・・・・・・Lead wire spit C) At the meeting, the lock Nsai pair. 6

Claims (4)

[Claims] (1) With machining fluid interposed in the micro-machined gap formed by the electrode and the workpiece facing each other, a voltage pulse similar to that of a wind is applied between the pauses 114. do l1
iS [h as a machining power supply for electrical discharge machining that uses electricity
3. Turn on the output voltage of the DC power source and the DC type 1 [source].
A) a switching element that generates the voltage pulse; J in the gap
A lead wire consisting of a set of a large number of unit parallel conductive wires with a step () near the processing gap that is close to the machining gap, and on the other hand, each adjacent unit conductor wire is branched at both DN81+, and the unit conductor wires are not adjacent to each other. Each bundle connection end on one end side of the lead wire is connected to each current-carrying connection part of the electrode and the workpiece, and each bundle connection end on the other end side is connected to each current-carrying connection part of the electrode and the workpiece. A power supply device for electrical discharge machining, wherein each terminal of the capacitor and the switching element connected to each other is connected to the other terminal of the capacitor and the switching element. (2) The discharge 11 [1 industrial power supply device] according to claim 1, wherein the aggregate of unit parallel conducting wires is a plurality of flat aggregates stacked and arranged in parallel planes. (3) The capacitor is made up of multiple conductor wires, and the connecting end of the aggregate of the type F-7tn wires on the capacitor terminal side connects unit wires that are not adjacent to the H wires for each nearby conductor. The Futagawa Electric Power Coupler according to claim 1, which is a bundle of desired numbers of electric cables. (4) The switching element consists of a set of IB 1-heran sisters, and the connecting end of the set of flat B G wires on the L to transistor side connects the unit conductors that are not adjacent to each other in a desired number for each neighboring conductor. A power supply device for electrical discharge machining according to claim m 1 M, which is a bundled device.