JPH0957540A - Wire cut discharge working device, and positioning method for wire electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively remove an adherent adhering to a wire electrode and accurately position the wire electrode, when the wire electrode and a work piece are brought into contact to perform the positioning or vertical aligning for the wire electrode. SOLUTION: An upper side wire guide device 1 is comprised by including upper and lower guide units 4 and 6 and an energizing part unit 5. A wire guide, comprised of movable and fixed die guides 61 and 62, are provided on the unit 6, and an attachment removing device 8, for removing an adherent adhering to a wire electrode 2, is provided between the wire guide and a jet nozzle 63. At the time of positioning the wire electrode, the adherent is removed by flowing down the adherent from a fluid supply source 84 to a fluid passage 82, provided in the inside of a removing device main body 81, according to a command signal from a removing device control device 80, and jetting the attachment in a neary vertical direction to the axis line of the extendedly erected electrode 2 from plural attachment removing nozzles 83 connected to the passage 82. After the positioning is finished, the supply of fluid is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-cut electric discharge machining apparatus and method for positioning a wire electrode by detecting a contact between the wire electrode and a workpiece. A wire-cut electric discharge machine equipped with a removal device that effectively removes metal dust and other deposits adhering to the wire electrode due to friction between the die guide and the wire electrode, and removes deposits adhering to the wire electrode. The present invention relates to a wire electrode positioning method in which a wire electrode and a workpiece are brought into contact with each other to set a relative position of the wire electrode.

[0002]

2. Description of the Related Art FIG. 11 is a schematic diagram showing an outline of a general wire cut electric discharge machine.

The wire electrode 2 is fed from the bobbin 11 by a feed roller 12 rotated by a feed motor 13. The wire electrode 2 fed out is directed by the direction changing pulley 14 toward the workpiece 3 placed on the cross table 23 via a mounting member (not shown).

The tip of the redirected wire electrode 2 passes through the upper guide device 16 by the automatic wire connection device 15. A die guide 16A having high positioning accuracy when guiding the wire electrode 2 is provided as the wire guide, and the wire electrode 2 is formed by the wire electrode 2 and the workpiece 3 while being guided by the die guide 16A. To reach the gap. Then, the wire electrode 2 that has passed through the gap
Is guided by a die guide 17A of the lower guide device 17 and is rotated by a winding motor 19 and is wound by a winding roller 18
Is taken up and discharged. At this time, the traveling wire electrode 2 is braked in the direction opposite to the traveling direction by the tension pulley 20 provided with the brake motor 21, and a predetermined tension is applied between the traveling wire electrode 2 and the winding side.

The control device 23 controls the traveling speed of the wire electrode 2 and its tension, the automatic connection operation for automatically stretching the wire electrode 2, and the relative movement between the wire electrode 2 and the workpiece 3. To do. Further, a voltage having a predetermined pulse width is applied between the electrodes at a predetermined cycle, and the power supply device 24 is controlled so as to obtain a desired machining current.

The wire electrode 2 is connected to the minus side of the machining power supply device 24 via the electric conductor 7. Further, the work piece 3 is connected to the plus side of the power supply device 24 via an unillustrated energizing jig. When a predetermined voltage is applied between the electrodes of the wire electrode 2 and the work piece 3 by the power supply device 24, a discharge is generated between the wire electrode 2 and the work piece 3,
Electric discharge machining is performed. At this time, when the wire electrode 2 and the workpiece 3 come into contact with each other to cause a short circuit, the voltage between both electrodes is 0.
Since it becomes V, the contact between the wire electrode 2 and the workpiece 3 can be electrically detected by the gap detection device 25.

Further, with reference to a preset value, feedback control is appropriately performed by a detection signal of each detection device provided for each control. For example, the feed speed of the wire electrode can be detected by counting the pulse signals sent from the pulse generators 22A and 22B, and the rotation of the feed motor 13 and the take-up motor 19 can be made to reach the predetermined feed speed. To control.
Alternatively, the movement amounts of the cross tables 23X and 23Y can be respectively detected by the rotary encoders 27X and 27Y that count the rotation amounts of the shaft drive motors 26X and 26Y, and the movement command value in the axial direction and the detection value of this encoder can be detected. Correct the error of. Needless to say, there is a taper device (not shown) for taper processing for cutting the workpiece by inclining the wire electrode 2 by a predetermined angle, and this taper device is also provided with a drive device and a device for detecting the position. There is.

Next, a conventional method for positioning the wire electrode 2 by using this apparatus will be described.

The wire electrode 2 is stretched vertically in advance so that a predetermined tension is applied. In addition, the wire electrode 2 is connected to the minus side through the current-carrying body 7, the workpiece 3 is connected to the plus side, and a voltage having a predetermined value is applied between the two electrodes. Then, while the wire electrode 2 is traveling at a predetermined feed speed, the cross table 2 is moved at a predetermined feed speed.
3 is moved, and the wire electrode 2 and the workpiece 3 are relatively moved.

At this time, when the wire electrode 2 and the workpiece 3 come into contact with each other, the contact detection device 25 electrically detects the contact between them and sends a contact detection signal to the control device 23. In response to this signal, the control device 23 obtains the position data from the movement amount data detected by the encoder 27 at that time, and stores the position data in a memory (not shown) as coordinate values. Then, the same operation is repeated a preset number of times, and the average value of the coordinate values detected in each is calculated. This work is performed in each of the X-axis direction and the Y-axis direction.

[0011]

At this time, the wire electrode 2 rubs against the wire guide, and fine metal dust is attached to the wire electrode 2. Further, fine dust, dust, and metal scraps are attached to the work piece 3, or fine dust and dust are similarly present between the wire electrode 2 and the work piece 3. Further, paraffin may adhere to the surface of the wire electrode 2 for the reason of manufacturing the electrode wire. When the wire electrode 2 and the workpiece 3 are brought into contact with each other and the relative position at that time is detected, such an “adhered matter” is detected.
Are intervening as “obstacles” and come into contact with each other, it can be detected that the wire electrode 2 and the work piece 3 are in contact with each other, or conversely, the contact cannot be detected, and accurate positioning cannot be performed. There is a problem.

[0012] As a countermeasure against such a problem, S.K.
There is proposed a device for removing the burrs of the wire electrode disclosed in Japanese Patent Laid-Open No. 37545/1993 and a device for supplying air to the gap between the electrodes, which is disclosed in Japanese Patent Laid-Open No. 63-120026. However, particularly fine electrode dust attached to the wire electrode is generated as the wire electrode and the wire guide rub against each other and moves as the wire electrode runs, and thus cannot be sufficiently removed by the conventionally known technique.

The present invention effectively removes obstacles such as fine metal powders existing in the machining gap during positioning, particularly deposits adhering to the wire electrode, without disturbing the traveling of the wire electrode during machining. The main object of the present invention is to provide an apparatus and method capable of more accurately positioning the wire electrode and the workpiece.

[0014]

In view of the above-mentioned problems, the present invention provides a wire guide for guiding the wire electrode at a predetermined position on each of the side from which the wire electrode is fed out and the side from which the wire electrode is collected with the workpiece being sandwiched therebetween. In the wire-cut electric discharge machining device, a machining unit is provided for the electric conductor provided on the feed side of the wire electrode of the wire guide on the feed side and the electric discharge machining liquid provided on the workpiece side of the wire guide on the feed side. And a removing means for removing deposits adhering to the wire electrode between the wire guide on the sending side and the machining liquid ejecting nozzle, and for positioning or vertically extending the wire electrode. And a control means for operating the removing means.

The removing means preferably comprises at least a plurality of deposit removing nozzles for ejecting a fluid, a fluid passage for introducing the fluid to the nozzles, and a fluid supply source for supplying the fluid.

As another configuration, the removing means is
At least a pad that comes into contact with the wire electrode, a holding means that holds the pad, and a driving means that moves the pad with respect to the wire electrode are provided. And, preferably, the pad is made of felt or urethane.

On the other hand, in order to solve the above-mentioned problems, in the method of positioning the wire electrode and the work piece according to the present invention, the wire electrode is sent out from the wire guide provided on the side for sending out the wire electrode with the work piece sandwiched therebetween. Remove the deposits attached to the wire electrode, move the wire electrode in a state where the deposits are removed and the workpiece, and detect that the wire electrode and the workpiece contact each other. The position data at that time is stored so that the wire electrode is positioned.

[0018] Preferably, the operation of bringing the wire electrode into contact with the workpiece and storing the position data at that time is performed a plurality of times, and a plurality of position data obtained by the plurality of operations are stored. When the error is larger than a predetermined value, the deposit attached to the wire electrode is removed in the vicinity of the workpiece side of the wire guide provided on the side for sending out the wire electrode.

More preferably, the wire electrode and the workpiece are brought into contact with each other while the wire electrode is traveling at a predetermined feed speed while a predetermined tension is applied to the wire electrode, and the position data at that time is stored in advance. After correcting the position data based on the stored data regarding the vibration amplitude of the wire electrode and storing the correction data, the position data at that time is stored by contacting the wire electrode again, When the step of comparing the position data with the correction data and the comparison result is out of a predetermined range, the step is performed again, and the number of times the step is repeated exceeds a preset number. After removing the deposits attached to the wire electrode, the step is performed again to position the wire electrode.

The data regarding the amplitude of the vibration includes the material of the wire electrode, the diameter of the wire electrode, and
At least one of a plurality of conditions of a tension applied to the wire electrode, a feed speed at which the wire electrode travels, and a distance between a pair of wire guides sandwiching the workpiece is included. It is desirable that the data is the correlation data between the condition and the amplitude of the vibration.

Further, preferably, when removing the deposits attached to the wire electrodes, the obstacles present in the gap between the wire electrodes and the workpiece are also removed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the configuration of a wire guide device of a wire cut electric discharge machine according to the present invention. More specifically, the wire guide devices are provided above and below with a workpiece to be sandwiched therebetween. 1 shows an upper wire guide device of a type in which a normal wire electrode is stretched almost vertically. It should be noted that the overall configuration of the apparatus will be described with reference to FIG. 10, and members common to the related art will be described using the same reference numerals.

Reference numeral 1 is an upper wire guide device, and 2 is a wire electrode. The guide device 1 includes an upper guide unit 4, an energization unit 5, and a lower guide unit 6.
And

The upper guide unit 4 mainly comprises a wire introducing port 41 and a wire introducing guide 42. The wire introduction port 41 is formed in a mortar shape so that one end of the wire electrode 2 can be easily captured when the wire electrode 2 is stretched.

The current-carrying unit 5 includes a slide body 51 which can slide to bring the current-carrying body 7 into contact with and retract from the wire electrode 2, and a current-carrying unit housing 52 connected to the slide body 51. The current-carrying body 7 is sandwiched by the housing 52 and fixed by the fixing member 53.

The energizing unit 5 is electrically insulated from the electric discharge machine body by a ceramic guide block 54 for guiding the slide body 51 inside and an insulating joint 56 for insulating the slide body 51 itself. There is. The inside 55 of the current-carrying part housing 52 is filled with a machining fluid during electric discharge machining to cool the current-carrying body 7.

The lower guide unit 6 is provided with a die type wire guide consisting of a movable die guide 61 and a fixed die guide 62. A protrusion 57 fixed to the energization unit housing 52 is inserted into the through hole of the movable die guide 61. Therefore, when the slide body 51 moves in the direction of retracting the current carrying body 7 from the wire electrode 2 and the current carrying part housing 52 slides, the movable die guide 61 is separated from the fixed die guide 62 via the protrusion 57. It moves integrally in the direction of.

Between the die guide of the lower guide unit 6 and the workpiece, preferably immediately below the die guide, fine metal scraps and other deposits attached to the wire electrode 2 delivered from the die guide are removed. A deposit removing device 8 is provided.

The removing device 8 has a cylindrical main body 81 having a hollow portion. Inside the main body 81, a fluid flow path 82 composed of an annular flow path and a radial flow path connected to the flow path is formed. A plurality of deposit removal nozzles 83 are provided in the hollow portion so as to be connected to the fluid flow path 82. Each of these removal nozzles 83 is provided with its ejection port toward the center of the main body 81. Preferably, the deposit removing nozzle 83 is installed so that the fluid is sent out in a direction perpendicular to the sending direction of the wire electrode 2 in which the jet port is stretched in a substantially vertical direction, that is, in a substantially horizontal direction. In this case, the wire electrode 2 is
It is located so as to be radially surrounded by the removal nozzle 83.

A fluid supply source 84 is connected to the fluid flow path 82 via a fluid introduction pipe 85, and in accordance with a command signal from the removal device control device 80, the fluid supply source 84.
Supply air or cleaning liquid.

As means for sliding the slide body 51,
A slide body drive device 9 is provided. The drive device 9 includes an air cylinder 91 and switches the reciprocating movement of the piston 92 by inputting an electric signal to a solenoid valve (not shown). One end of the piston 92 is fixed to the slide body 51, and the slide body 51 slides as the piston 92 reciprocates.

FIG. 2 is a plan view of the upper wire guide device 1 described with reference to FIG. 1 when viewed from the lower side, that is, when viewed from the machining fluid injection nozzle side 63, and mainly includes the lower guide unit 6 and the lower guide unit 6. 3 shows the positional relationship between the fluid passage 82 and the removal nozzle 83 of the adhered matter removing device 8 installed in FIG.

In this embodiment, four removal nozzles 83
Are provided radially toward the wire electrodes. Fluid flow path 82 for supplying fluid to the removal nozzle 83 of the main body 81
Is an annular fluid flow path 8 formed substantially concentrically with the outer circumference of the lower guide unit 6 or the inner circumference of the machining fluid injection nozzle.
2, the annular fluid flow path 82 is connected to a fluid introduction pipe 85 for introducing a fluid sent from the outside,
The fluid sent from the fluid supply source 84 installed at a remote place is supplied to the removal nozzle 83.

The machining liquid supply unit 10 is connected to the side wall of the energization unit 5 and supplies the machining liquid sent from a machining liquid supply device (not shown) to the upper portion of the energization unit housing 55 of the energization unit 5. To do.

FIG. 3 is a perspective view for explaining the detailed assembly structure of the lower guide unit 6 in the upper wire guide device 1 described with reference to FIGS. 1 and 2.
The same members as those in FIG.

The lower guide unit 6 has an annular concave space portion formed by the inner body 6A and the outer wall body 6B of the lower guide unit 6. This space is the current-carrying housing of the current-carrying unit 5. It has a function of causing the working fluid introduced from the working fluid passage 64 communicating with the portion 55 to flow down to the working fluid jet nozzle 63.

A groove 65 is provided in the inner body 6A,
The movable die guide 61 and the fixed die guide 62 have grooves 65.
Be fitted into. The movable die guide 61 has a through hole, and the protrusion 57 of the slide body 51 described in FIG. 1 is inserted into this through hole. Then, the movable die guide 61 slides along the groove 65 in a predetermined range as the slide body 51 moves.

The die guide fixing disc 66 is fixed with a plurality of screws 67 so as to cover the inner body 6A, and the movable die guide 61 and the fixed die guide 62 are housed in the groove 65. Further, the fixed die guide 62 is fixed to the inner body 6A by the die guide fixing pin 68. At this time, the fixed die guide 62 must be fixed so that the die portion thereof is located in the traveling path of the wire electrode 2. The circular plate 66 has a hole of a predetermined size, through which the wire electrode passes, approximately in the center thereof.

On the lower side of the disc 66, a cylindrical body 81 of the adhered matter removing device 8 is attached. This body 81 is
The inner body 6A has a cage portion that fits into the lower end portion of the inner body 6A and the disc 66, and is configured so that the inner body 6A is housed in a part of the main body 81. The main body 81 can be easily attached to the inner body 6A by using a plurality of screws.
Can be fixed to.

The main body 81 has a fluid introducing pipe 85 penetrating the outer wall 6B of the lower guide unit 6 and communicating with the fluid passage.
Is attached, and fluid from an external fluid source is supplied to the main body 8
1 is supplied.

The machining liquid jet nozzle 63 is fixed so as to cover each member in the lower guide unit 6 along the screw groove formed in the outer wall body 6B. Therefore, the injection nozzle 6
By rotating in the opposite direction to when 3 was attached,
The injection nozzle 63 can be easily removed from the main body of the lower guide unit 6.

FIG. 4 is a diagram showing the configuration of another embodiment of the present invention, showing a state in which the current-carrying body 7 is retracted so as to be separated from the wire electrode 2. The same members as those in the previous embodiment are designated by the same reference numerals.

In this embodiment, an adhering substance removing pad 86 is provided as a removing means for removing adhering substances adhering to the wire electrode. Further, an adhering matter removing nozzle 83 is additionally provided here so that the adhering matter can be removed more reliably.

The removal pad 86 has a relatively hard core, and its surface is made of elastic felt or urethane. The surface of the wire electrode 2 is brought into contact with the wire electrode 2, and the wire electrode 2 is installed so as not to hinder the wire electrode 2 when traveling at a predetermined feed speed. Two or more such pads 86 are preferably provided, and more preferably, they are symmetrically opposed to each other.

In FIG. 4, the flow of the working fluid introduced from the working fluid inlet 10A of the working fluid supply unit 10 is shown by using arrows. The inflowing working fluid fills the inside 52 of the housing of the energization unit 5, cools the energizing body 7, and passes through the plurality of working fluid flow paths 64 penetrating the inner body 6A. The machining fluid that has passed through the machining fluid flow path 64 is introduced into the space formed by the inner body 6A and the outer wall body 6B, flows down, and reaches the machining fluid injection nozzle 63. Then, the obstacles such as dust or dust that are sprayed into the gap between the wire electrode and the work piece and are present in the gap or adhered to the work piece are washed away.

FIG. 5 is a view for explaining in detail the adhered substance removing apparatus of the embodiment shown in FIG. 4, in which a part is cut away to show the inside thereof. Further, FIG. 6 is a diagram showing a mounting portion of the deposit removing pad of the deposit removing device shown in FIG.

The main body 81 of the adhered matter removing device 8 includes a adhered matter removing nozzle 83 and a fluid introducing pipe 8 for introducing a fluid into the main body 81.
5, a deposit removing pad 86, and a pad mounting member 87.

Below the removing nozzle 83, a pair of deposit removing pads 86 are attached to the main body 81 by a pad attaching member 87. The pad mounting member 87 is made of a hard plastic material, and is configured to hold the pad 86 by sandwiching the pad 86 by a restoring force when the protruding portion is opened to the outside and the pad 86 is pushed in, thereby facilitating the replacement of the pad 86. There is.

As shown in FIG. 6, the pad mounting member 8
7 is connected to a driving device 89, which is an electromagnet installed in the main body 81, via a sealing material 88, and the pad 86 can be retracted from the wire electrode 2. When the positioning is not performed, the pad 86 is retracted from the wire electrode 2 to prevent the pad 86 from being worn during processing. In this case, in order to position the pad so that it does not hinder the traveling of the wire electrode 2 even when the pad is closed, it is preferable to provide a stopper function such as making the end portion of the pad 86 and the pad attachment member concave. This drive 89
Various methods can be adopted according to installation conditions, such as a method using an electrostrictive material.

FIG. 7 is a block diagram showing the configuration of the control device in the wire cut electric discharge machine of the present invention.
An embodiment of the apparatus of the present invention and the method of the present invention will be described below with reference to FIGS. 1 to 7 and necessary portions with reference to FIG.

The control device 23, which is the main part of the control means,
The processing control device 230, the memory 231, and the reading device 232 are included. The processing control device 230 further includes an arithmetic unit (not shown) and a storage unit that stores a control program.

The control device 23 includes the machining power supply device 24, the machining gap detection device 25, the input device 28, the display device 29, the removal device control device 80, the guide control device 90, and the machining liquid control device 1.
00, wire feed control device 120, automatic wire connection control device 1
50 and the motor control driver 260, respectively.

First, the automatic wire connection device 15 is operated by the drive signal from the automatic wire connection control device 150 to stretch the wire electrode. At this time, the processing control device 230 also sends a command signal to the guide control device 90, operates the slide body drive device 9 to slide the slide body 51, and moves the current carrying body 7 and the movable die guide 61 to the wire electrode 2. Evacuate from the travel route.

When the wire electrode 2 is stretched, the machining control device 230 causes the feed motor 13, the winding motor 19, and the brake motor 21 via the wire feed control device 120.
To drive the wire electrode 2 to run. At this time, the processing control device 230 operates the slide driving device 9 via the guide control device 90 to bring the current-carrying body 7 into contact with the wire electrode 2 so that the wire electrode 2 can be energized, and the movable die guide 61 to the wire electrode 2. Will be in a state of being guided.

The wire electrode 2 includes a wire introduction guide 42,
The electric conductor 7 and the die guides 61 and 62 rub against each other, and the fine particles such as fine metal or plastic of the wire electrode 2 or each member adhere to the surface of the wire electrode 2.
When the wire electrode 2 is positioned, in order to perform the positioning with accuracy, fine dust attached to the surface of the wire electrode 2 is removed. When a die guide with high positioning guide accuracy is used, a hard member such as diamond or sapphire is used for the guide portion of the die guide, and therefore, the wire electrode dust is particularly likely to adhere to the surface of the wire electrode. Therefore, the work of removing the fine dust attached to the wire electrode must be performed at a position closer to the workpiece than the die guide.

A command signal is input from the input device 28, or the NC program for positioning recorded on the floppy disk is read via the reading device 232. Then, the processing control device 230 sends a command signal to the removing device control device 80 to operate the deposit removing device 8 to remove the deposit on the wire electrode 2. The removal device 8
However, in an apparatus configured to remove the adhering matter by a fluid, the liquid is easier to remove the adhering matter than the air, but in the apparatus of the embodiment, the fluid is a machining fluid jet nozzle 6
Since it flows down to 3, it is preferably a clean liquid of the same kind as the working liquid.

The processing control device 230 includes the deposit removing device 8
At the same time as activating, the machining fluid control device 130 is also supplied with a command signal to drive a machining fluid supply pump of a machining fluid supply device (not shown) to supply a clean machining fluid to the upper and lower nozzles and the wire electrode 2 and the target electrode. The gap of the work piece 3 and one surface of the work piece 3 are cleaned. When the wire electrode 2 and the workpiece 3 are brought into contact with each other, the working fluid control device 130 may be stopped so that the working fluid is not supplied.

The positioning operation command is recorded in the NC program on the floppy disk, read by the reading device 232, and temporarily stored in the memory 231. The machining control device 230 sends a movement command to the motor control driver 260 according to the program to drive the axis drive motor 26X or 26Y, and the wire electrode 2
And the workpiece 3 are moved relative to each other. At the same time, a command is sent to the machining power supply device 24, and a voltage pulse having a value suitable for positioning in which the wire electrode 2 and the workpiece 3 are less likely to be damaged is applied between the electrodes.

When the contact between the wire electrode 2 and the workpiece 3 is electrically detected by the gap detection device 25, the machining control device 230 receives the detection signal and immediately receives the signal via the motor control driver 260. Axis drive motor 26X or 26Y
To stop. Then, relative position data can be obtained from the detection value obtained from the rotary encoder 27X or 27Y, and this position data is stored in the memory 231.

When the positioning of the wire electrode by the contact detection is completed, the processing control device 230 causes the removal control device 80 to stop the operation of the extraneous matter removal device 8. At this time, when the removing device 8 is a device having a structure using the deposit removing pad, the pad 86 is retracted from the wire electrode 2.

As described above, by removing the dust adhering to the surface of the wire electrode before or during the positioning of the wire electrode, the positioning accuracy of the wire electrode can be improved. Can be improved.

The wire-cut electric discharge machine of the present invention is not limited to the embodiment described above, and various combinations are possible without departing from the spirit of the present invention. For example, the pad 86 is installed on the upper side, and the attached matter removing nozzle 83
It is possible to prevent the removed adhered matter from flowing into the gap between the wire electrode 2 and the workpiece 3 by installing the on the lower side and operating it so as to suck.

FIG. 8 is a flow chart for explaining an embodiment of the wire electrode positioning method of the present invention.
Next, another embodiment of the wire electrode positioning method of the present invention will be described with reference to FIG.

In this embodiment, a "positioning step" for performing relative positioning between a wire electrode and a workpiece, which will be described later, and a "cleaning step" for removing dust and dust adhering to the wire electrode and the workpiece are separated. ing.

The positioning work is started by an operation such as turning on the start switch. At this time, the number of cleaning steps is reset (S1), and the number of positioning steps is also reset (S2). Note that even if the memory 231 is used to count this number of times,
A separate counter may be provided.

First, the wire electrode 2 and the workpiece 3 are relatively moved in the X-axis direction so as to approach each other, and a predetermined voltage is applied between them. This relative movement is performed until the wire electrode 2 and the workpiece 3 come into contact with each other (S3). At this time, the coordinate value in the Y-axis direction should not change.

When the detection device 25 detects contact and outputs a signal (S4), the control device 23 stops the relative movement (S5). Then, the coordinate value X1 is detected and stored in the memory. When the position is detected by the encoder, the coordinate value X1 may be calculated and stored from the detected X-axis cumulative movement amount (S6).

Then, the wire electrode and the work piece are moved relative to each other to separate the wire electrode and the work piece from each other (S7), and the wire electrode and the work piece are separated from each other as in step 3. Relative movement is performed until both contact (S8). Then, when they contact each other (S9), the coordinate value X at that time
2 is detected and stored (S10).

Next, from the stored coordinate value X2 to the coordinate value X
1 is subtracted (S11), and the calculation result D is compared with a preset allowable value K (S13). This allowable value K
Is, for example, ± 2 μm, though it depends on the minimum feed unit and accuracy of the motor and the accuracy of the machine itself. Therefore, D is 0
If, it means that there is no error between the two detections.

If D is within the range of the predetermined allowable value K, there is no error or it can be ignored, the coordinate value X2 is set, and the positioning is completed (S14). Needless to say, in this case, the average value of the coordinate value X1 and the coordinate value X2 may be set as the relative position.

If D is not within the range of the predetermined allowable value and the number n1 of the series of positioning steps has not reached the preset number N, steps S7 to S13 are performed. In this case, the coordinate values X1 and X2 may be detected again by returning to step S3. On the other hand, if D is not within the predetermined range and the number of repetitions n1 is equal to or greater than the set number of times N1 (S15),
It is determined that there is a high possibility that the wire electrode 2 or the work piece 3 has an adhered matter or that an obstacle such as dust is interposed between the two. When the set number of times N is 0 and an error occurs, the following cleaning process can be performed without fail. At this time, if the cleaning process has already been performed many times, there may be some other obstacle, and therefore the work may be interrupted by issuing a warning or the like (S16).

When it is determined that the error does not disappear even if the positioning step is repeated (S15), for example, a high-pressure machining liquid jet of 10 kg / cm or more suitable for “cleaning” is supplied from the machining liquid jet nozzle. To do. The jet flow first cleans the wire electrode to remove deposits attached to the wire electrode, and then flows down into the gap to wash away the workpiece and the gap (S17). This "cleaning" is continued for a predetermined time.
When the cleaning is completed, the number of times the cleaning process is repeated n2
Is counted up, the process returns to step S2, the number of times n1 of the positioning process is reset, and then the positioning process is performed from the beginning.

In the position embodiment method described above, various applications and combinations can be changed without departing from the spirit of the present invention. For example, the work of detecting the coordinate value X by the relative positioning of the wire electrode and the workpiece can be performed m times, and the error can be obtained from the average value.

FIG. 9 is a flowchart showing still another embodiment. It should be noted that the description common to the embodiment described in FIG. 8 is incorporated by reference.

The positioning work is started by an operation such as turning on the start switch, and the number of "positioning steps" described below is reset (S2).
1).

Next, the wire electrode 2 and the workpiece 3 are relatively moved in the X-axis direction so as to approach each other, and a predetermined voltage is applied between them (S22). At this time, the coordinate value in the Y-axis direction should not change. In this case, the frequency of the vibration of the wire electrode 2 is 2 to 5 kHz so that the contact can be detected when the amplitude of the vibration of the wire electrode is constantly increased.
Considering z, the relative feed rate is set to be relatively slower than the feed rate when not normally machined. For example, when the motor feed command unit is 1 μm and the frequency of the vibration is 2 kHz, it is 1 in 500 microseconds.
Send μm.

When the detecting device 25 detects the contact and outputs a signal (S23), the relative movement is stopped (S24). The coordinate value X1 is calculated from the cumulative movement amount of the X axis detected by the encoder and stored in the memory (S25).

Here, the predetermined amplitude data L is read out from a plurality of prestored amplitude data which will be described later (S2).
6). Then, the corrected coordinate value X2 is obtained by subtracting the amplitude data L from the calculated coordinate value X1 and stored (S2).
7). The coordinate value X2 is the position of the center of vibration when the wire electrode 2 is vibrating, in other words, the position of the axis when the wire electrode 2 is not vibrating.

Then, once, the wire electrode 2 and the work piece 3 are processed.
Are moved relative to each other (S28). Again, the wire electrode 2 and the workpiece 3 are relatively moved in the approaching direction (S29), and the contact between them is detected (S30).

When the contact between the wire electrode 2 and the workpiece 3 is detected, the relative movement is stopped (S31), and the coordinate value X3 is calculated and stored from the cumulative movement amount from the encoder at that time (S32). Then, the coordinate value X previously stored
The absolute value α of the value obtained by subtracting the coordinate value X3 from 2 is calculated (S33).

Next, a value β is obtained by subtracting the amplitude data L from this α (S34). Then, at this time, the series of steps from step S22 to step S34 is set as a "positioning step", the number of times is counted up, and the cumulative number n is stored (S35).

After that, it is compared whether or not the calculated β is within a predetermined allowable range (S16). This allowable value K
Is, for example, −2 μm or more and 2 μm or less here, though it depends on the minimum feed unit and accuracy of the motor and the accuracy of the machine itself. If the calculated β is 0, that is, α and L
Are equal to each other, which means that there is no error between the two detections. Therefore, the coordinate value X2 calculated previously is set as the relative position of the wire electrode 2 (S37).

On the other hand, if β is not within the range of ± 2 μm, the series of positioning steps from step 22 to step 34 is performed again. At this time, when the cumulative number n becomes equal to or greater than the preset number N (S38), the wire electrode, the work piece, and the gap are cleaned in the same manner as in the previously described embodiment of FIG. Therefore, the positioning process is performed again (S39).

Since the above steps relate to the positioning of the wire electrode in the X-axis direction, the same steps are performed as Y.
It is also done in the axial direction. Incidentally, even for vertical extension for vertically stretching the wire electrode, when performing by detecting the contact between the two, particularly when performing electrical contact detection, by applying the method of the present invention, It is possible to perform vertical alignment efficiently and accurately.

Further, in this embodiment, as a preferred embodiment, the error judgment is performed based on the amplitude data L, but the amplitude calculated by the detected position data is directly used without using the amplitude data. The same positioning work can be performed by comparing with the allowable range R. That is, the amplitude can be measured by detecting the contact between the wire electrode and the workpiece, and the position in consideration of the amplitude can be determined depending on whether the amplitude is within a predetermined error range.

Here, the amplitude data in the above method will be described. FIG. 10 is a graph showing the relationship between the distance between the upper die guide and the lower die guide, the diameter of the wire electrode and the applied tension, and the amplitude of vibration of the wire electrode. At this time, L is a wire electrode 2 which is vertically stretched.
Is the horizontal distance from the position of the center of the axis when no vibration occurs to the position of the part farthest from the center of the wire electrode 2 due to vibration.

The vibration amplitude of the wire electrode is the same from the opposite direction after the wire electrode running from any one direction is brought into contact with a horizontally-arranged cylindrical contact jig having a predetermined diameter and the position is detected. The position can be detected by contact detection, and it can be calculated from the position data at the time of each contact, the diameter of the cylindrical contact jig, and the diameter of the wire electrode. For the measurement of this amplitude, a known method can be used regardless of this method. Then, such a correlation between the amplitude and each condition is achieved by measuring the amplitude under the setting of each condition.

Such correlation data is divided into a number of pieces of data corresponding to an assumed setting and recorded in advance in a memory. The conditions are not limited to those described above, and for example, the material of the wire electrode and the feed speed of the wire electrode may be considered.

The operator is required to use an electrode having a diameter of φmm to be used in advance,
The applied tension WTg and the guide-to-guide distance 1 mm are input and set from an operation panel (not shown). Then, data suitable for this combination is extracted from a plurality of data groups stored in advance according to this combination. At this time, since the relationship between each condition and the amplitude is shown as in FIG. 10, it is possible to calculate the relationship even if it does not match each set value of each condition. It is not necessary to strictly determine the number of such correlation data, and a conventionally known method can be applied to the extraction or calculation method.

[0090]

EFFECTS OF THE INVENTION Since the present invention has been made as described above, it is provided in the gap formed by the wire electrode and the work piece after being sent out from the wire guide provided on the sending side of the wire electrode. Before reaching, the deposits on the wire electrode can be removed directly or directly. That is, particularly for the fine metal powder generated by rubbing the wire electrode and the die guide, a force for directly removing it immediately after it is attached can be applied, so that the attached matter is more effectively To be removed.

Moreover, since the adhering matter removing means is provided near the die guide, the adhering matter removing means is made to operate at the fulcrum of the wire electrode to be stretched,
It hardly affects the vibration state of the wire electrode.

As a result, according to the present invention, it is possible to perform the positioning of the wire electrode with higher accuracy without hindering the traveling of the wire electrode during processing and affecting the processing. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of an embodiment of an upper wire guide device in a wire cut electric discharge machine of the present invention.

FIG. 2 is a plan view showing the configuration of the embodiment apparatus shown in FIG. 1 as seen from below.

FIG. 3 is a perspective view showing details of the apparatus of the embodiment shown in FIG.

FIG. 4 is a cross-sectional view showing the configuration of another embodiment of the wire guide device in the wire cutting device of the present invention.

5 is a perspective view showing a detailed configuration of the embodiment apparatus shown in FIG.

FIG. 6 is a perspective view showing details of an adhered substance removing device of the embodiment device shown in FIG.

7 is a perspective view showing another form of the deposit removing device shown in FIG. 6. FIG.

FIG. 8 is a flowchart showing a procedure of an embodiment of a method for positioning a wire electrode according to the present invention.

FIG. 9 is a flowchart showing the procedure of a wire electrode positioning method according to another embodiment of the present invention.

FIG. 10 is a graph showing an example of the relationship between the amplitude of the wire electrode, the diameter of the wire electrode, the material, the tension, and the distance between the upper and lower wire guides.

FIG. 11 is a diagram showing an example of the overall schematic configuration of a conventional wire electric discharge machine.

[Explanation of symbols]

 1, upper wire guide device 2, wire electrode 3, workpiece 4, upper guide unit 5, energizing unit 51, slide body 52, energizing unit housing 53, fixing member 57, protrusion 6, lower guide unit 61, movable Die guide 62, fixed die guide 63, machining fluid injection nozzle 7, electric conductor 8, deposit remover 80, remover controller 81, deposit remover main body 82, fluid passage 83, deposit remover 84, fluid Supply source 85, fluid introduction pipe 86, deposit removing pad 87, pad mounting member 89, pad driving device 9, cylinder device 10, machining liquid supply unit 100, machining liquid control device 13, delivery roller 16, upper guide device 16A, Die guide 17, lower guide device 17A, die guide 18, winding roller 20, tension pulley 2 3, control device 230, processing control device 231, memory 24, processing power supply device 25, gap detection device

Claims (10)

[Claims] 1. A wire-cut electric discharge machine comprising wire guides for guiding a wire electrode at a predetermined position on each of a side for sending out a wire electrode and a side for collecting the wire electrode with a workpiece sandwiched therebetween. Of the wire electrode, a current-carrying body provided on the delivery side of the wire electrode, a machining-fluid injection nozzle for supplying an electric discharge machining fluid provided on the workpiece side of the wire guide on the delivery side to a machining section, and a wire on the delivery side. Between the guide and the machining liquid jet nozzle, there are provided a removing means for removing deposits adhering to the wire electrode, and a control means for activating the removing means when positioning or vertically aligning the wire electrode. Wire-cut electric discharge machine characterized by. 2. The removing means comprises at least a plurality of deposit removing nozzles for ejecting a fluid, a fluid flow path for introducing the fluid to the nozzles, and a fluid supply source for supplying the fluid. The wire cut electric discharge machine according to claim 1. 3. The removing means comprises at least a pad that comes into contact with the wire electrode, a holding means that holds the pad, and a driving means that moves the pad so as to move back and forth with respect to the wire electrode. The wire cut electric discharge machine according to claim 1. 4. The wire cut electric discharge machine according to claim 6, wherein the pad is made of felt or urethane. 5. The wire-cut electric discharge machine according to claim 1, wherein the wire guide is a die guide. 6. A wire electrode sent from a wire guide provided on a side for sending out a wire electrode with a workpiece sandwiched between the wire electrode and the wire electrode in a state where the attached material is removed and the wire electrode It is characterized in that the workpiece is moved relative to the workpiece, the contact between the wire electrode and the workpiece is detected, and the position data at that time is stored to position the wire electrode. Positioning method of wire electrode in wire cut electrical discharge machining. 7. The operation of bringing the wire electrode into contact with the workpiece and storing the position data at that time is performed a plurality of times, and an error of a plurality of position data obtained by the plurality of operations is predetermined. Is larger than the value of, the wire cut discharge is characterized in that the adhered matter adhered to the wire electrode is removed in the vicinity of the work piece side of the wire guide provided on the side for delivering the wire electrode. Positioning method of wire electrode in processing. 8. A wire electrode and a workpiece are brought into contact with each other while the wire electrode is traveling at a predetermined feed speed while applying a predetermined tension to the wire electrode, and the position data at that time is stored and stored in advance. After correcting the position data based on the data regarding the amplitude of vibration of the wire electrode stored and storing the correction data, the wire electrode is contacted again to store the position data at that time, and the position is stored. If the result of the comparison is out of a predetermined range, the process is performed again, and if the number of times of repeating the process exceeds a preset number, the process of comparing the data with the correction data is performed. The position of the wire electrode in the wire-cut electric discharge machining is characterized in that after removing the deposits attached to the wire electrode, the step is performed again to position the wire electrode. Arrangement method. 9. The data regarding the amplitude of vibration of the wire electrode includes a material of the wire electrode, a diameter of the wire electrode, a tension applied to the wire electrode, and a feeding speed at which the wire electrode travels. 9. The correlation data between a condition including at least one of a plurality of conditions of a distance between a pair of wire guides provided to sandwich the workpiece and the amplitude of the vibration. A method for positioning a wire electrode in wire cut electric discharge machining according to. 10. The method according to claim 6, wherein when removing the adhering matter adhering to the wire electrode, an obstruction present in a gap between the wire electrode and the workpiece is also removed.
The wire-cut electric discharge machining method according to claim 9.