JPH0335941A - Wire electrode vertical positioning device for wire electric discharge machining device - Google Patents

Abstract

PURPOSE:To reduce the degree of contact of a wire electrode with a contact detecting ring to a low value and to improve vertical positioning precision by a method wherein a wire vertical positioning jig is moved one step at a time, and moved in a way to gradually reduce a step amount as the position of a wire electrode is corrected in a vertical direction. CONSTITUTION:When upper or lower contact detecting ring 4 or 5 of a wire electrode vertical positioning jig 9 makes contact with a wire electrode 1, the jig is moved backward by one step by a separating moving means, and a corresponding wire guide 2 or 3 is moved by one step toward the jig side by means of the moving means. The jig is moved by one step at a time toward the wide electrode side by means of a repeat means to repeat the operation. When the detecting rings make simultaneously contact with the wire electrode, a moving distance per one step is reduced by a set circuit 31 and same operation is repeated by a second repeat means. Thereafter, a moving distance per one step is increased, same operation is repeated, and when the detecting rings are brought into contact with the wire electrode, a completion signal H is outputted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a method in which an insulating machining liquid is supplied between a wire electrode whose upper and lower sides are supported by a wire guy 1 and a workpiece 7. This invention relates to a two-contact wire electrode vertical device for machining a workpiece by supplying pulsed power to generate intermittent arc discharge.

[Conventional technology]

Conventionally, there was a device of this type as shown in Fig. 3 (see Japanese Patent Laid-Open No. 139617/1983). In Fig. 3, 1 is a wire electrode, 2 is an upper wire guide, and 3 is a wire electrode. This is the lower wire guide. 9 is a jig for directing the wire tli pole weir, which includes an upper contact detection ring 4, a contact detection ring 5 on the do side, an insulating ring 6 on the to side, an insulating ring 7 on the to side, and a cylinder 8.
Be prepared. IO is a bed on which the wire electrode vertical extension 19 is placed, +1 is a DC power source for contact detection, and 12 is a power supply.

13 is a −L side contact detection terminal, and 14 is a lower contact detection terminal.

In such a conventional device, the wire electrode vertical ejecting jig 9 is now moved through the bed 10 in the direction of X + right (right direction in the figure).
If the lower contact detection 11S ring 5 contacts the wire electrode (see FIG. 4(a)), the voltage from the DC power supply 11 is transmitted from the lower contact detection terminal 14 through the feeder 12. Side contact detection is detected as No. N Eo. Thereafter, the wire electrode vertical alignment jig 9 is further moved in the X direction until the upper contact detection ring 4 also contacts the wire electrode 1 (see FIG. 4(b)). 9 in the opposite X'' direction, and move 1'
The wire electrode is separated from the F-side contact detection ring 4.5. Subsequently, the -h side wire guide 2 is moved in the U'''' direction (see FIG. 4(e)), and then again.

I = Attempt contact detection on wire electrode as described.

The wire electrode 1 is automatically brought out vertically by repeating the same operation until the signals from the G and G side contact detection terminals 13 and 14 (upper and lower contact detection numbers) Eu+E:o are detected at the same time. It is something.

[Problem to be solved by the invention]

However, in such a conventional device, -h, the wire @ pole vertical removal jig 9 is fed to the wire electrode l side until both the lower contact detection links 4 and 5 come into contact with the wire electrode L, The tension of the wire electrode 1 is strongly applied to the contact detection ring 4°5 on the side of the wire. On the other hand, the wire electrode 1 is being operated vertically,
While the vehicle is running, the upper and lower contact detection rings 4,
5 is made of a material harder than the wire ttH4111. Therefore, when the wire electrode vertically extending jig 9 is fed to the wire electrode L side as described above, the contact surfaces of the upper and lower contact detection rings 4 and 5 (in the example of FIG. 4, the lower contact detection ring Since the tension of the wire fttil is strong on the ring 5, the wire fttil is especially applied to the contact surface on the F side contact detection ring 5 side.
i1 is rubbed too hard and scum forms. For this reason, the residue of the wire electrode 1 adheres to the wire electrode 1 and the upper and lower contact detection rings 4 and 5, and the wire electrode 1 and the upper and lower contact detection rings J4.5 are connected via it. It becomes conductive,
There was a problem that the detection of the device on the wire electrode was not performed accurately, and the vertical alignment of the wire electrode was not performed with high accuracy.

An object of the present invention is to provide a wire electrode vertical alignment device for a wire electrical discharge machine that can vertically align a wire electrode with high precision.

[Means to solve the problem]

The purpose of item 1 is to provide a wire electrical discharge machine with E and D side contact detection rings having the same outer diameter and electrically insulated from the phase 71, which are vertically disposed vertically facing each other at the top and bottom. A wire electrode vertical extension jig, upper and lower contact detection circuits for separately detecting that the upper and lower contact detection rings are in contact with the wire electrode, and the above.

Wire electrode vertical ejecting jig approach moving means for gradually moving the wire electrode vertical ejecting jig closer to the wire electrode by step movement when no wire electrode contact detection signal is output from any of the lower contact detection circuits; When the wire electrode contact detection signal is obtained in any of the seventh and lower contact detection circuits, the wire electrode vertical ejecting jig is opened to cause the wire electrode vertical ejecting jig to emit a u-shot from the wire electrode by one step. A moving means moves the upper or lower wire guide by l steps toward the wire electrode vertical ejecting jig in response to a wire electrode contact detection signal from the upper or lower contact detection circuit, and removes the wire electrode. is vertical +1
Wire guide transfer to JJ! After the wire guide is moved by the wire guide moving means, the first wire electrode vertically moving means moves the wire electrode vertically moving jig 1 closer, the wire electrode vertically moving jig separates and moves, and the wire guide is moved repeatedly. an operation repeating means; a step feed amount setting circuit for reducing the movement amount per step when the wire electrode contact detection signals are simultaneously obtained from the upper and lower contact detection circuits; and the step feed amount setting. a second wire electrode vertical extension operation repeating means for repeatedly performing the first wire electrode vertical extension operation and step feed m setting with a movement amount reduced by the circuit; and a movement per step by the step feed amount setting circuit. a wire electrode vertical extension completion signal that outputs a wire electrode vertical extension completion signal when the wire electrode contact detection signal is obtained from the upper and lower contact detection circuits after the amount is set to a predetermined minimum value; This is achieved by providing an output circuit.

[For production]

The wire electrode vertical placement jig approach moving means moves the wire electrode vertical placement jig stepwise toward the wire electrode side, and the wire electrode vertical placement jig separation movement means moves the wire electrode vertical placement jig to the wire electrode vertical placement jig. When the upper or lower contact detection ring comes into contact with the wire electrode, the wire electrode vertical setting jig is moved back one step. And by the wire guide moving means, the top? 72. If the contact was with the upper contact detection ring, the lower wire guide is moved one step toward the wire electrode vertical extraction jig, and if the contact was with the lower contact detection ring, the upper wire guide is moved by one step.

Next, the first wire electrode vertically extending operation repeating unit moves the wire electrode vertically extending jig one step at a time toward the wire electrode side again, and tries the above-described operation again.

L. When the lower contact detection ring contacts the wire electrode at the same time, the step feed amount setting circuit lowers the moving distance per step from 0.1 m to 0.01 m, and repeats the vertical movement of the second wire electrode. A similar operation is retried by means of the following means.

Finally, the same process is repeated for each step, for example, at 1 μm increments, and when the upper and lower contact detection rings simultaneously touch the wire electrode, the wire electrode vertical ejection completion signal output circuit outputs the wire electrode vertical ejection completion signal. Output a completion signal.

As a result, the wire electrode makes light contact with the contact detection ring, and scum of the wire electrode is prevented from adhering to the wire electrode or the contact detection ring.

The position of the wire electrode can be detected accurately, and the wire electrode can be placed vertically with high precision.

〔Example〕

The present invention will be described in detail below with reference to one drawing. FIG. 1 is a circuit diagram showing an embodiment of a wire electrode vertical alignment device for a wire electrical discharge machine according to the present invention.Although not shown here, the present invention also has all the configurations shown in FIG. There is. In addition, in FIG. 3, the DC power supply 11 and the feeder 1
2 constitutes the main structure of an upper and lower contact detection circuit that specifically detects when the upper and lower contact detection rings 4 and 5 come into contact with the wire electrode 1.

In FIG. 1, the input terminal hole receives the upper contact detection signal HI from the upper contact detection terminal 13, and the input terminal B receives the lower contact detection signal ED from the lower contact detection terminal 14. is given. These contact detection signals ED and ED
are input separately to the inputs of the AND gate 20, and this AN
The output of the D gate 20 is given to the second input of the ANI gate 23, which is a wire electrode vertical extension completion signal output circuit. Further, the contact detection signals El and ED are ORed, respectively.
Inverter 22 and AND gate 25 through gate 21
is applied to the first human power, and the output of the inverter 22 is AND
Given to the first manpower at gate 24. Further, the contact detection signal ELI+ED is applied to the AND gate 26. The first man power of AND gate 27 is given separately.

Furthermore, the output of the ANI) gate 20 is a step feed signal,
The human power W of the fixing circuit 31 is also applied, and G of the step feed amount setting outputs E, )', and G is applied to the first input of the AND gate 23. A vertical output completion signal I() is obtained from the output of the AND gate 23.

Further, the start signal C is applied to the center input power S of the flip-flop 28 and the reset input power R of the step feed area setting circuit 31, and a clock signal having a predetermined period is outputted as A N1. ) is given to the second manpower at gate 29. The first input of this A N l) gate 29 is given the output Q of the front flood flip-flop O sop 28 .

A N I) The output of the gate 29 is the AND gate 2
4°25 and 26.27 are given to the respective second manpower. Then, the output of the AND gate 24 is the X+axis movement ll] command human power X◆ of the NC device:)O, the output of the AND gate 25 is the X-axis movement command human power X-, and the small force beam of the AND gate 26 is The output of the AND gate 27 is given to the axis movement command human power (J+) and the one axis movement command human power (J-1).

l)! IK self-step feed amount setting circuit 31 output 1',
, F, G are, for example, 0, 1 van/step, 0
．． 01mw/step.

Outputs one of the command values of 0.001m/step,
A fire is placed in the NC'IA position 30 at 0°.Next, the automatic vertical wire feeding operation of the continuous tree invention device will be described in detail with reference to FIG.

First, a start signal C is applied by a pushbutton switch (not shown) to set the flip-flop 28 and, at the same time, reset the step feed slope setting circuit 31. This will send the steno knob! Set between i#fi
The output of 31 is one output E=O, I/Stesub, and this signal E is given to the NC device 30. Flip-flop 28 is in the set state.

Since the output Q is at the "L" level, the clock signal is passed through the AND gate 29 to the AND gates 24 and 25.
．． 26.27 are given to the second manpower respectively.

When the wire electrode 1 and the above-mentioned -1, non-contact detection ring 4°5 are both separated, the upper and lower contact detection signals Eu, Ehiha 1
10 I+ level. Therefore, Ol<gate2
The output of the inverter 22 is at the "O'" level, and the output of the inverter 22 is at the II+ level. This inverter 22's
The l'' level output opens the A N L) gate 24 and passes the clock signal from the AND gate 29. This clock No. 8 is input to the NC equipment!?30 X Jusuke movement command human power X+, As a result, the wire electrode vertical ejecting jig 9
approaches the middle direction of X, that is, the wire electrode l side by 0.1 . At this time, when the - upper and lower contact detection signals Eυ and E[1 are not detected, the fifth-order clock signal is used to similarly
Move further one step (0,1■) in the middle direction. As a result, if the wire electrode 1 is attached to the lower contact detection ring 5,
When the lower side contact detection signal ED is inputted to the input terminal 8, the output of the OR gate 21 becomes "1" level. This “l II level output is A
The ND gate 25 is opened, so that the clock signal 10 becomes N
The X-axis movement command manual force xl of the C device 30 is input. As a result, the wire W1. The pole support direct removal jig 9 is moved (separated) by 0.1 mm in the X direction, that is, on the opposite side to the wire electrode 1 (see FIG. 2(b)).

In addition, the contact detection signal ED on the 1jiJ side also opens the gate 27 (ANL), and the clock signal ED opens the U of the NC device 30.
This causes the axis movement command to be input to the human power U-.

The L side wire guide 2 approaches the U direction, that is, the wire electrode vertical extension jig 9 side by 0.1 m (Fig. 2(c)
)reference).

In this state, both the upper and lower contact detection rings 4°5 and the wire electrode are 0.1 degrees apart, so the contact detection signal on the contact detection side is not detected, and therefore the wire voltage is The ti-ib direct removal jig 9 moves to the X+ right side.

As a result, if the upper and lower contact detection signals Eu.

When t<D is obtained at the same time, an output is obtained in the OR gate 21, and the AND gate 25 is opened, thereby 1)
(] Tsuk signal D h< N CV & 130 (IF)
X-axis rod! lI command is input to human power X-, the wire electrode vertical extension jig A9 moves in one direction
A "1" level signal is obtained at the output of the D gate 20, and this signal sets the step amount of the step feed amount setting circuit 31 to 0.0 Im/step. O1+n/
Step output F is given to NCVl[30.

Then, move the wire electrode vertical ejecting jig 9 again.
Repeat the same operation as twice, finally 0.001+s
The operation is performed in /steps, and the upper and lower contact detection rings 4.5 and 4.5 simultaneously operate the upper and lower contact detection rings 4.
ED can be obtained.

As a result, the contact on the wire electrodes to the contact detection rings 4 and 5 is a light contact, the wire electrode 1 is vertically extended with high accuracy, and a vertically extended γ signal H is obtained from the AND gate 23. By using this vertical extension completion signal H as a drive signal for a lamp, a buzzer, etc., it is possible to notify that the vertical extension of the wire electrode has been completed. Also,
If the flip-flop 28 is set to the reset state with the vertical exit completion gamma No. 46H, the Q of the flip-flop 28 will be
The output is “OIJ level” and the clock signal is AND
Gate 29. Therefore, it no longer passes through all AND gates 24 to 27, making it an NG device! ! 30 is in a stopped state.

In the above-described embodiment, the vertical extension of the wire electrode 1 in the X-axis direction has been described, but it goes without saying that the same operation can be performed in the Y-axis direction as well.

〔Effect of the invention〕

According to the present invention, the wire electrode vertical positioning jig moves one step at a time, corrects the wire electrode to a vertical force of 1 ft, and moves while gradually decreasing the amount of steps, so that the contact detection ring The contact of the wire electrode to will be a light contact. Therefore, the wire electrode scum does not form and adhere to the wire electrode or the upper and lower contact detection rings as in conventional devices, and the position of the wire electrode is detected accurately, allowing the wire to be brought out extremely vertically. This has the effect of being performed with high precision.

According to experiments by the inventors, the length between the upper and lower contact detection rings of the wire electrode vertical extraction jig: 90+m, top.

Length between lower wire guides: 110cm, operating clock cycle:
0.5 seconds/step, wire electrode diameter: φ0.2.

As a result of tilting the wire electrode by lsm and performing the above-mentioned vertical movement of the wire electrode, the accuracy was tested.
A wire electrode vertical alignment accuracy of ±3μ- was obtained. In addition,
In the conventional device, the wire electrode vertical placement accuracy was about ±7μ.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the device of the present invention. Figure 2 is an explanatory diagram of the operation of the same device, Figure 3 is the wire 11t.
! FIG. 4 is a partially cutaway side view of a conventional device for a very vertical extraction jig, and FIG. 4 is an explanatory diagram of the operation of the conventional device. l... Wire electrode, 2, 3... Upper and lower wire guides, 4, 5... Upper and lower contact detection rings, 6.7...
Upper and lower insulating rings, 8... Cylinder, 9... Wire electrode vertical extension jig, 10... Bed, 11... DC fig for contact detection, +2... Power feeder, 13.14・
・Upper and lower contact detection terminals - EU+ F: o"' Upper and lower contact detection signals, 20, 24° 25, 26.27.29.
...AND gate, 21..OR gate, 22..inverter, 23..AND gate (wire electrode vertical extension completion signal output circuit), 28..flip-flop, 30..NC device, 31..step feed. Amount setting circuit. Patent applicant Hitachi Seiko Co., Ltd.

Claims (1)

[Claims] 1. While supplying an insulating machining liquid between the wire electrode, whose upper and lower sides are supported by wire guides, and the workpiece, pulsed power is supplied to generate intermittent arc discharge, and the workpiece is machined. For wire electric discharge machines that perform A wire electrode contact detection signal is output from each of the upper and lower contact detection circuits that separately detect that the upper and lower contact detection rings have contacted the wire electrode, and the upper and lower contact detection circuits. a wire electrode vertical positioning jig approach moving means that gradually brings the wire electrode vertical positioning jig closer to the wire electrode by step movement when the wire electrode vertically positioning jig is not output; a wire electrode vertical ejecting jig separation moving means for separating the wire electrode vertical ejecting jig from the wire electrode by one step when the wire electrode is obtained in any of the circuits; wire guide moving means for moving the upper or lower wire guide by one step toward the wire electrode vertical alignment jig in response to a wire electrode contact detection signal of the wire electrode in a direction to make the wire electrode vertical; After the wire guide movement by the wire guide moving means, a first wire electrode vertical positioning operation repeating means for repeatedly performing the wire electrode vertical positioning jig approach movement, the wire electrode vertical positioning jig separation movement, and the wire guide movement; a step feed amount setting circuit for reducing the movement amount per step when wire electrode contact detection signals are simultaneously obtained from the upper and lower contact detection circuits;
With the travel amount reduced by this step feed amount setting circuit,
A movement amount per step is set to a predetermined minimum value by a second wire electrode vertical feeding operation repeating means for repeating the first wire electrode vertical feeding operation and step feed amount setting, and the step feeding amount setting circuit. After that,
and a wire electrode vertical extension completion signal output circuit that outputs a wire electrode vertical extension completion signal when the wire electrode contact detection signals are simultaneously obtained from the upper and lower contact detection circuits. Wire electrode vertical feed device for processing machine.