JPH11179617A - Wire electric discharge machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a winding of a wire electrode, by providing a wire correction roller correcting a winding of the wire electrode and a roller control means changing a position of the wire correction roller to adjust correction force of the winding of the wire electrode. SOLUTION: This machining device 1 has a wire supply part delivering a wire electrode 14 from a wire bobbin 15 arranged in the upstream of a wire feed path A to advance this wire electrode 14 toward the downstream of the wire feed path A, the wire electrode 14 supplied by this supply part is used, and a workplace 7 is electric discharge machined. Here, a wire correction roller 18 set up in the upstream of the wire feed path A to correct a winding of the wire electrode 14 and a roller control means 19 adjusting correction force of the winding of the wire electrode 14 by changing a position of the wire correction roller 18 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine for electric discharge machining of a workpiece using a wire electrode supplied by a wire supply section.

2. Description of the Related Art Conventionally, techniques in such a field include:
Japanese Patent Application Laid-Open No. Hei 5-8123 is known. The conventional wire electric discharge machine described in this publication includes a roller type wire straightening means arranged between a wire bobbin around which a wire electrode is wound and an automatic wire connection machine for connecting the wire electrode. Roller wire straightening means
A pair of rollers is provided to sandwich a wire electrode fed from a wire bobbin. The wire electrode passes through the roller-type wire straightening means to correct the curl of the wire electrode. As another conventional technique, Japanese Patent Application Laid-Open No.
JP-A-172422, JP-A-61-293726, JP-A-2-53528, JP-A-4-1460
No. 29 publication.

[0002]

By the way, the strength of the curl in the wire electrode is not constant. That is, the wire electrode wound around the center of the wire bobbin has the strongest curl, and the wire electrode becomes weaker away from the center. For this reason, in the conventional wire electric discharge machine which corrects the curl with an equal force to all the wire electrodes, the curl of the wire electrode may not be sufficiently corrected. An object of the present invention is to solve such a problem and to provide a wire electric discharge machine capable of reliably correcting the curl of a wire electrode.

[0003]

According to a first aspect of the present invention, there is provided a wire electric discharge machine which draws out a wire electrode from a wire bobbin disposed upstream of a wire feed path, and advances the wire electrode downstream of the wire feed path. In a wire electric discharge machine which has a wire supply unit and performs electric discharge machining of a workpiece using a wire electrode supplied by the wire supply unit, the wire electric discharge machine is installed upstream of a wire feed path to correct a curl of the wire electrode. It is characterized by comprising a wire straightening roller and roller control means for changing the position of the wire straightening roller and adjusting the straightening force of the wire electrode.

According to a second aspect of the present invention, there is further provided a wire data input means for receiving an input of a winding diameter of the wire electrode on the wire bobbin, and the roller control means adjusts the straightening force based on the input data received by the wire data input means. It is characterized by doing. Preferably, the wire data input means also receives an input of the material of the wire electrode, and the roller control means adjusts the straightening force based on the data of the winding diameter and the material of the wire electrode.

According to a fourth aspect of the present invention, there is further provided a winding diameter measuring means for measuring a winding diameter of the wire electrode on the wire bobbin, and the roller control means adjusts the straightening force based on the measurement data measured by the winding diameter measuring means. It is characterized by the following. According to a fifth aspect of the present invention, the apparatus further comprises a bobbin type detecting means for detecting a type of the wire bobbin, wherein the roller control means adjusts the correcting force based on the detection data detected by the bobbin type detecting means.
A sixth aspect of the present invention is characterized in that the roller control means increases the correction force in accordance with the supply amount of the wire electrode in the wire supply section.

[0006] In claim 7, the wire straightening roller comprises:
A pair of support rollers that are arranged at intervals in the extending direction of the wire electrode and support the wire electrode, and a pressing roller that is disposed between the pair of support rollers and presses the wire electrode supported by the support roller. It is characterized by having. According to the eighth aspect, the wire correcting roller changes the arrangement after the wire electrode is mounted on the wire feed path, and releases the correcting force while processing the workpiece.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a wire electric discharge machine according to the present invention will be described below with reference to the accompanying drawings. Embodiment 1 FIG. FIG. 1 is a schematic diagram showing a wire electric discharge machine 1 according to the first embodiment. As shown in FIG. 1, the wire electric discharge machine 1 includes a base 4 having an X-axis slide rail 2 and a Y-axis slide rail 3 arranged on an upper surface. A slide table 5 is provided on the X-axis slide rail 2.
The slide table 5 slides in the X-axis direction (left-right direction) in accordance with the rotation of the X-axis ball screw 6. On the slide table 5, a fixed base 8 for fixing the workpiece 7 and a processing tank 9 surrounding the fixed base 8 are provided. The inside of the processing tank 9 is filled with the processing liquid, and the surface of the workpiece 7 is always covered with the processing liquid.

A column 10 having a substantially rectangular parallelepiped shape is provided on the Y-axis slide rail 3. The column 10 slides in the Y-axis direction (front-rear direction) in accordance with the rotation of the Y-axis ball screw 11. A Z-axis slide rail 12 extending in the Z-axis direction (vertical direction) is provided on the upper side of the front surface of the column 10 which is the surface facing the fixed base 8. Z axis slide rail 12
Is provided with a slide arm 13 that hangs down toward the fixed base 8, and the slide arm 13 slides in the Z-axis direction in accordance with the rotation of the Z-axis ball screw.

In the upper part of the rear part of the column 10, a wire electrode 1 is provided.
A wire bobbin 15 around which the wire 4 is wound is provided. Then, the wire electrode 14 extended from the wire bobbin 15 extends forward toward a pulley 16 provided at the upper end of the slide arm 13. Between the wire bobbin 15 and the pulley 16, a brake 17 for applying tension to the wire electrode 14, a wire straightening roller 18 for straightening the curl of the wire electrode 14, and a force for straightening the curl of the wire straightening roller 18 are continuously provided. Alternatively, a roller control motor (roller control means) 19 that adjusts stepwise is provided.
The roller control motor 19 is driven based on a control signal given from a wire data input unit (wire data input means) 20. Here, the roller control motor 1
As 9, a linear motor in which the motor shaft is linearly driven continuously or stepwise in the axial direction is used. Instead of the roller control motor 19, a cylinder that is driven linearly or continuously by air pressure or the like may be used, and this cylinder may be used as the roller control means.

An upper wire guide 21 is provided at a lower end of the slide arm 13, and an automatic wire supply unit 22 is fixed to the slide arm 13 between the upper wire guide 21 and the pulley 16. As a result, the upper wire guide 2
1 is disposed above the fixed base 8 and the pulley 1
The wire electrode 14 turned in the direction 6 extends downward toward the fixing base 8 via the automatic wire supply unit 22 and the upper wire guide 21. A lower arm 23 extending forward toward the fixed base 8 is provided in a lower part of the front surface of the column 10, and a lower wire guide 24 is fixed to a front end of the lower arm 23. As a result, the lower wire guide 24 is disposed below the fixed base 8, and the upper wire guide 21 and the lower wire guide 24 face each other via the fixed base 8. A through-hole is formed in the fixing base 8, and the wire electrode 1 is formed.
4 extends toward the lower wire guide 24 through the through hole. A pulley 25 is provided inside the lower wire guide 24.
And the wire electrode 1 turned by the pulley 25
4 extends rearward inside the lower arm 23.

A wire recovery pipe 26 extending rearward is provided at the lower stage on the rear surface of the column 10, and a recovery roller 27 is incorporated at the tip of the wire recovery pipe 26. further,
A wire outlet 28 is formed at the lower end of the wire collection tube 26, and a wire collection box 29 is placed below the wire outlet 28. The wire electrode 14 having the lower arm 23 extending rearward advances in the lower stage of the column 10 and the inside of the wire collection pipe 26, and after turning downward by the collection roller 27, reaches the wire collection box 29. I do.
Thus, the wire electrode 14 fed from the wire bobbin 15 is connected to the pulley 16, the pulley 25, and the collection roller 2.
The wire path after turning at 7 and reaching the wire collection box 29 constitutes the wire path A.

Next, referring to FIG.
1 will be described. The upper wire guide 21 is fixed to the lower end of the slide arm 13 via the mounting plate 30. An upper block 31 is fixed to the mounting plate 30, and an upper auxiliary guide 32 is mounted on an upper surface of the upper block 31. A cylindrical upper wire guide holder 33 is screwed and fixed to the lower surface of the upper block 31, and a wire guide 34 for precisely guiding the wire electrode 14 is provided at the tip of the upper wire guide holder 33.

A jet nozzle 35 for guiding the wire electrode 14 with a submerged jet is mounted around the upper wire guide holder 33. In addition, the jet nozzle 35
A cylindrical housing 36 having an upper end fixed to the lower surface of the upper block 31 is provided around the periphery of the housing 36, and a spring 37 is inserted between the housing 36 and the jet nozzle 35. As a result, the jet nozzle 35 is
6 can be moved up and down along the inner peripheral surface. Further, the upper end of the upper block 31 is provided around the housing 36.
A cap-shaped upper nozzle 38 fixed to the lower surface of the upper nozzle 38 is attached, and a jet port 39 is formed at the center of the lower surface of the upper nozzle 38.

A guide hole 40 is formed at the center of the upper block 31 so as to penetrate the wire electrode 14 in the up-down direction, and the inside of the upper block 31 is brought into contact with the wire electrode 14 in the guide hole 40. A power supply die 41 for supplying power is incorporated. A working fluid injection hole 42 is formed in a side portion of the upper block 31, and the tip of the working fluid injection hole 42 is connected to a gap between the housing 36 and the upper nozzle 38. Then, the working fluid pressurized and supplied through the working fluid injection hole 42 passes through a gap between the housing 36 and the upper nozzle 38 and is ejected from the ejection port 39. Here, a passage 43 is formed on the side of the upper wire guide holder 33, and a part of the processing liquid supplied to the gap between the housing 36 and the upper nozzle 38 is jetted by the internal static pressure of the upper nozzle 38. It enters the inside of the nozzle 35 and is taken into the inside of the upper wire guide holder 33 via the passage 43. The working fluid taken in this way is supplied to the wire cooling and power supply die 4 inside the upper wire guide holder 33.
It is used for cooling the contact energizing section.

Further, a jet water flow injection hole 44 is formed on a side portion of the upper block 31, and the tip of the jet water flow injection hole 44 is connected to a gap between the upper wire guide holder 33 and the jet nozzle 35. Then, the jet water stream pressurized and supplied by the jet water stream injection hole 44 is jetted from the jet port 39 through a gap between the upper wire guide holder 33 and the jet nozzle 35. The jet stream jetted from the jet port 39 advances toward the lower wire guide 24, and the wire electrode 14 is sent inside the jet stream. As a result, the wire electrode 14 that has passed through the upper wire guide 21 reaches the lower wire guide 24.

Next, referring to FIG.
4 will be described. The lower wire guide 24 is fixed to the tip of the lower arm 23 with a bolt 51 via an insulating plate 50. A lower block 52 is fixed to a lower portion of the insulating plate 50, and a guide support plate 53 is provided on the lower block 52.
Is attached. A cylindrical lower wire guide holder 54 is screwed and fixed to the upper surface of the guide support plate 53, and a wire guide 55 for precisely guiding the wire electrode 14 is provided at the tip of the lower wire guide holder 54. I have.

A rectifying plate 56 for rectifying the working fluid is attached around the lower wire guide holder 54, and a cap-shaped lower nozzle whose lower end is fixed to the upper surface of the guide support plate 53 around the rectifying plate 56. 57 are provided.
A lower end of the guide support plate 5 is provided around the lower nozzle 57.
A cylindrical pressing member 58 fixed to the upper surface of the fixing member 3 is fixed, and a spring 59 is inserted between the pressing member 58 and the lower nozzle 57. As a result, the lower nozzle 57
Can move vertically along the inner peripheral surface of the holding member 58.

A guide hole 60 is formed in the center of the lower block 52 so as to penetrate the wire electrode 14 in the up-down direction, and the inside of the lower block 52 is brought into contact with the wire electrode 14 in the guide hole 60. A power supply die 61 for supplying power is incorporated. A lower auxiliary guide 62 is provided below the power supply die 61, and supports the power supply die 61 from below. A cable 63 is connected to the guide support plate 53, and the guide support plate 53 is made of a conductive material. Therefore, power from the power supply is supplied to the power supply die 61 via the cable 63 and the guide support plate 53.

A working fluid injection hole 64 is formed on the side of the lower block 53. The tip of the working fluid injection hole 64 is connected to a gap between the lower wire guide holder 54 and the lower nozzle 57. Then, the working fluid pressurized and supplied through the working fluid injection hole 64 is supplied to a gap between the lower wire guide holder 54 and the lower nozzle 57. Here, a passage 65 is formed on a side portion of the lower wire guide holder 54, and one of the working fluid supplied to the gap between the lower wire guide holder 54 and the lower nozzle 57 by the internal static pressure of the lower nozzle 57. The part is taken into the inside of the lower wire guide holder 54. The working fluid thus taken in is used for cooling the wire inside the lower wire guide holder 54 and for cooling the contact energizing portion of the power supply die 61.

The lower block 52 is formed with an L-shaped wire introduction hole 66 extending upward and rearward. The entrance 66a and the exit 66b of the wire introduction hole 66 have a tapered shape, and the inside of the wire introduction hole 66 is thin. A roller 67 is incorporated in the bending portion of the wire introduction hole 66, and the direction of the wire electrode 14 introduced into the wire introduction hole 66 changes along the roller 67. Further, a jet water injection hole 6 formed on the front surface of the lower block 52 and extending rearward is formed at the bending portion of the wire introduction hole 66.
8 merge, and the jet water flow supplied from the jet water flow supply pipe 69 advances inside the wire introduction hole 66 toward the outlet 66b. As a result, the wire electrode 14 introduced to the refraction portion of the wire introduction hole 66 advances toward the outlet 66b of the wire introduction hole 66 on the jet water flow.

Next, the automatic wire supply section 22 will be described. As shown in FIG. 4, the automatic wire supply unit 22 includes a wire feed roller (wire supply unit) 70 that sends the wire electrode 14, which has been turned by the pulley 16, downward.
And the wire electrode 1 fed by the wire feed roller 70
And a tubular wire guide cylinder 71 for guiding the wire 4 through the inside. The wire guide cylinder 71 has a small-diameter wire guide pipe 72 that has a common central axis as the wire guide cylinder 71 and slides vertically. The wire guide pipe 72 can extend to the upper surface of the upper wire guide 21, and can guide the wire electrode 14 to the upper wire guide 21 through the inside of the wire guide cylinder 71 and the wire guide pipe 72.

Between the wire guide cylinder 71 and the upper wire guide 21, there is provided an electric wire 7 for energizing the wire electrode 14.
3, a direction changing roller 74 for changing the direction of the wire electrode 14, and a cutting roller 75 for cutting the wire electrode 14.
And a winding roller 76 for winding the wire electrode 14 in the upper wire guide 21. And
The electricity passage 73 and the cutting roller 75 are arranged on the front side of the wire electrode 14, and the direction changing roller 74 and the winding roller 76 are arranged on the rear side of the wire electrode 14. The electricity transmission 73, the direction changing roller 74, and the cutting roller 75
It is fixed to the cylinders 73a, 74a, 75a and moves in the front-rear direction in accordance with the expansion and contraction of the cylinders 73a, 74a, 75a.

Next, the operation of the wire electric discharge machine 1 will be described. The wire electric discharge machine 1 performs three operations of a wire feeding operation, a wire cutting operation, and a wire discharging operation. First, the wire feeding operation will be described. FIG.
As shown in FIG. 4, when the wire electrode 14 fed from the wire bobbin 15 is inserted into the automatic wire feeder 22 through the brake 17, the wire straightening roller 18, and the pulley 16, the speed of the wire feed roller 70 shown in FIG. By driving, the wire electrode 14 moves down in the wire automatic supply unit 22. At this time, the wire guide pipe 72 extends to the upper surface of the upper wire guide 21. As a result, the wire electrode 14 is inserted into the guide hole 40 of the upper wire guide 21.

Then, the wire electrode 14 descends in the guide hole 40 by the driving of the wire feed roller 70, and is discharged from the ejection port 39 of the upper nozzle 38. Upper nozzle 3
A jet water stream is jetted from the jet port 8 of FIG. 8, and the wire electrode 14 discharged from the jet port 39 moves downward substantially at the center of the jet water stream. As a result, the wire electrode 14 is inserted into the guide hole 60 of the lower wire guide 24, and the wire electrode 14 is transported inside the guide hole 60 and the wire introduction hole 66. Further, the wire introduction hole 6
The jet stream is flowing backward inside 6.
The wire electrode 14 turned around along the roller 67 is carried inside the wire collection pipe 26 on this jet water flow. As described above, the wire electrode 14 inserted into the automatic wire supply unit 22 is sequentially sent to the guide hole 40 of the upper wire guide 21, the guide hole 60 of the lower wire guide 24, the wire introduction hole 66, and the wire collection pipe 26. .

Next, the wire cutting operation will be described.
The wire cutting operation is performed by the electron transmission 73, the direction changing roller 74, the cutting roller 75, and the winding roller 76 provided between the wire guide cylinder 71 and the upper wire guide 21. As shown in FIG. 5, when the wire guide pipe 72 is slid upward, the wire electrode 14 extending between the wire guide cylinder 71 and the upper wire guide 21 is exposed. Then, the cylinders 73a, 74a, 7
By extending the wire 5a and extending the electricity passage 73, the direction changing roller 74 and the cutting roller 75 toward the wire electrode 14, the electricity passage 73 comes into contact with the wire electrode 14, and the cutting roller 75 engages with the winding roller 76. Together
The wire electrode 14 is gripped. In this state, a cutting current is supplied to the current-carrying electrode 73, and the winding electrode 76 is rotated to pull the wire electrode 14 downward.

Next, the wire discharging operation will be described. The wire discharging operation includes an operation of discharging the wire electrode 14 into the wire collection box 29 and an operation of discharging the wire electrode 14 cut by the cutting roller 75 from between the wire guide cylinder 71 and the upper wire guide 21. . The former operation is an operation of discharging the wire electrode 14 conveyed inside the wire collection tube 26 to the wire collection box 29 by driving the collection roller 27. The latter operation is performed when the wire electrode 14 breaks during the processing of the workpiece 7 and the discharge by the collection roller 27 becomes impossible. That is, when the wire electrode 14 is disconnected at the position of the workpiece 7,
As shown in FIG. 6, the winding roller 76 rotates in the opposite direction. By this rotation, the wire electrode 14 in the upper wire guide 21 is wound up, and the wire electrode 14 passes between the cutting roller 75 and the winding roller 76 and is discharged from behind.

Next, the wire straightening roller 18 will be described. As shown in FIG. 7, the wire straightening rollers 18 are arranged at intervals in the direction in which the wire electrodes 14 extend, and a pair of support rollers 1 supporting the wire electrodes 14 at the lower end of the rollers.
8a and a pressing roller 18b disposed between the pair of supporting rollers 18a and pressing the wire electrode 14 supported by the supporting roller 18a upward. The curl of the wire electrode 14 is corrected by bending the wire electrode 14 along the peripheral surfaces of these rollers 18a, 18b, 18a. That is, the wire electrode 14 wound around the wire bobbin 15 has a curl in the direction in which the wire bobbin 15 is wound. For this reason, the wire electrode 14 in this state is often used during the transport of the wire feed path A, and it is difficult to reach the wire collection box 29.

Generally, a large pulley is arranged in the wire feed path A, but the winding habit of the wire electrode 14 cannot be corrected only by passing through the pulley. Since the wire electrode 14 is wound around the wire bobbin 15 for a long time, a slight permanent distortion remains, and the wire electrode 14 has a curl (warpage). For this reason, it is necessary to correct the curl by giving a certain distortion to the wire electrode 14. Therefore, the small-diameter wire straightening roller 18
Is arranged upstream of the wire feed path A, and the distortion in the opposite direction is generated in a short time, whereby the curl of the wire electrode 14 can be effectively corrected. Rollers with a small diameter are most suitable for correcting the curl, and if one time is insufficient,
Arranging a plurality of roller groups is also effective.

The pressing roller 18b is fixed to the motor shaft of the roller control motor 19, and moves up and down in accordance with the linear movement of the motor shaft. This pressing roller 18
Due to the vertical movement of b, the force of correcting the curl of the wire electrode 14 changes. That is, when the pressing roller 18b is moved downward, the distortion applied to the wire electrode 14 is reduced, and the force of correcting the curl of the wire electrode 14 is reduced. On the other hand, as shown in FIG. 8, when the pressing roller 18b is moved upward, the distortion applied to the wire electrode 14 increases, and the force of correcting the curl of the wire electrode 14 increases. The control of the roller control motor 19 is performed by a wire data input unit 20 shown in FIG. 1, and a control signal from the wire data input unit 20 is transmitted based on input data input by an operator. Given to.

The wire electrode 14 wound around the wire bobbin 15 has a large winding diameter at a portion far from the core and a small winding diameter at a portion near the core. For this reason, the curl of the wire electrode 14 near the core is stronger than the curl of the wire electrode 14 farther from the core. Then, an operator who monitors the winding diameter of the wire electrode 14 on the wire bobbin 15 inputs the winding diameter data to the wire data input unit 20, and a control signal corresponding to the winding diameter data is generated in the wire data input unit 20. Is done.

This control signal is a signal for giving the wire electrode 14 an optimum correction force for eliminating the curl of the wire electrode 14, and is provided corresponding to the winding diameter data. This control signal is input to the roller control motor 19, and the roller control motor 19 starts driving. The pressing roller 1 is driven by the driving of the roller controlling motor 19.
The position of 8b is changed continuously or stepwise, and the curl of the wire electrode 14 is reliably corrected.

Further, the strength of the curl varies depending on the thickness of the wire electrode 14. That is, between the thick wire electrode and the thin wire electrode, the thick wire electrode has a weaker curl, and the thin wire electrode has a stronger curl. This relationship is shown in the following table.

[Table 1] Further, the strength of the winding habit also differs depending on the material of the wire electrode 14. Therefore, an operator who monitors the thickness or the material of the wire electrode 14 inputs the thickness data or the material data of the wire electrode 14 to the wire data input unit 20, so that a control signal corresponding to the data is transmitted to the wire data. Generated by the input unit 20. This control signal is input to the roller control motor 19, and the roller control motor 19 starts driving. The position of the pressing roller 18b is changed continuously or stepwise by driving the roller control motor 19, and the curl of the wire electrode 14 is reliably corrected.

Here, a wire straightening roller 18 may be arranged between the wire bobbin 15 and the brake 17 as shown in FIG. That is, the wire electrode 14 is connected to the wire bobbin 1
It may be twisted when unreeled from 5. In such a case, the direction of the curl of the wire electrode 14 shifts, and the curl of the wire electrode 14 cannot be sufficiently removed even between the wire correcting rollers 18. Further, when the twist of the wire straightening roller 18 is close to 180 °, the winding of the wire straightening roller 18 is increased due to the stress of the wire straightening roller 18. Such a twist of the wire electrode 14 increases as the distance from the wire bobbin 15 increases. Therefore, by arranging the wire straightening roller 18 immediately after the wire bobbin 15, the influence of the twist of the wire electrode 14 can be minimized.

As shown in FIG. 10, the wire straightening roller 18 may be a single pressing roller 18b. That is, the wire electrode 14 passed between the wire bobbin 15 and the brake 17 is pressed from above with a small-diameter pressing roller 18b, whereby the wire electrode 14 is bent into a V-shape. Therefore, stress can be applied to the wire electrode 14 in the direction opposite to the direction of the curl, and the curl of the wire electrode 14 is corrected. The position of the pressing roller 18b can be changed by the roller control motor 19, and the correction force of the curl of the wire electrode 14 can be adjusted according to the strength of the curl of the wire electrode 14.

Further, the wire straightening roller 18 changes the arrangement after the wire electrode 14 is mounted on the wire feed path A, and reduces the curl of the wire electrode 14 during processing of the workpiece 7. It is preferable to release. That is, the correction of the winding habit of the wire electrode 14 is important when the wire electrode 14 is mounted on the wire feed path A, but once the wire electrode 14 is mounted, it has little meaning. Here, the tension applied to the wire electrode 14 during the processing of the workpiece 7 is mainly adjusted by the brake 17, but the tension adjustment becomes complicated if the wire straightening roller 18 acts at this time. Therefore, after the wire electrode 14 is mounted on the wire feed path A, the pressing roller 18b is shifted to a position away from the wire electrode 14 to release the curl correcting power of the wire electrode 14. As a result, when the workpiece 7 is processed, the resistance acting on the wire electrode 14 is only the brake 17,
Accurate tension adjustment of the wire electrode 14 becomes possible.

Embodiment 2 Next, a wire electric discharge machine according to a second embodiment will be described. FIG. 11 is a schematic view showing a wire electric discharge machine 2 according to the second embodiment. The second embodiment differs from the first embodiment shown in FIG. 1 in that, instead of the wire data input section 20, a winding diameter measuring section (winding diameter measuring means) for measuring the winding diameter of the wire electrode 14 on the wire bobbin 15. 80 and a data processing unit 81 that supplies a control signal to the roller control motor 19 based on the measurement data measured by the winding diameter measurement unit 80. Other configurations are the same as or equivalent to the first embodiment. The same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 12, the winding diameter measuring unit 8
Numeral 0 has a U-shaped frame shape surrounding the wire bobbin 15, and detects a linear pulsed light emitted from one frame by a line sensor incorporated in the other frame. On both side surfaces of the wire bobbin 15, slits 15a extending in the bobbin radial direction are provided to face each other, and only light passing through these slits 15a enters the line sensor. Therefore, as the wire electrode 14 is extended from the wire bobbin 15 and the area covering the slit 15a decreases, the amount of light received by the line sensor increases. As a result, the winding diameter of the wire electrode 14 on the wire bobbin 15 can be measured in real time based on the amount of light received by the line sensor.

The winding diameter data obtained by the winding diameter measuring section 80 is supplied to a data processing section 81. The data processing unit 81 is provided with a correspondence table between the winding diameter of the wire electrode 14 and the position of the pressing roller 18b, and the data processing unit 81 controls the pressing roller 18b based on the correspondence table. Convert to a signal.
Then, this control signal is output from the data processing section 81 and given to the roller control motor 19. The roller control motor 19 moves the pressing roller 18b continuously or stepwise based on the control signal. As described above, even when the strength of the winding habit of the wire electrode 14 changes due to the change in the winding diameter of the wire electrode 14, the optimum correction force can always be applied to the wire electrode 14. Habits can be reliably corrected.

Next, another example of the winding diameter measuring section 80 will be described with reference to FIG. As shown in FIG. 13, the winding diameter measuring unit 8 which is another example of the winding diameter measuring unit 80
Numeral 2 is arranged to face the peripheral surface of the wire bobbin 15 and has a light emitting portion 82a and a light incident position detection sensor 82b. Then, the winding diameter measuring unit 82 reflects the pulse light emitted from the light emitting unit 82a on the surface of the wire electrode 14 wound around the wire bobbin 15, and makes the reflected light incident on the light incident position detection sensor 82b. I have.

When the wire electrode 14 is paid out from the wire bobbin 15, the winding diameter measuring unit 82 and the wire electrode 14
And the distance changes. Therefore, a change in the winding diameter of the wire electrode 14 can be detected as a change in the incident position of the reflected light on the light incident position detection sensor 82b. The detection data detected by the light incident position detection sensor 82b is provided to a data processing unit 81, and the data processing unit 81 converts the input detection data into a control signal for the pressing roller 18b.

The control signal is supplied to a roller control motor 19, and the roller control motor 19 moves the pressing roller 18b continuously or stepwise based on the control signal. As described above, even when the strength of the winding habit of the wire electrode 14 changes due to the change in the winding diameter of the wire electrode 14, the optimum correction force can always be applied to the wire electrode 14. Habits can be reliably corrected.

Embodiment 3 Next, a wire electric discharge machine according to a third embodiment will be described. FIG. 14 is a schematic diagram showing a wire electric discharge machine 3 according to the third embodiment. The third embodiment differs from the first embodiment shown in FIG. 1 in that, instead of the wire data input unit 20, a bobbin type detecting unit (bobbin type detecting means) 90 for detecting the type of the wire bobbin 15; It is characterized in that it has a data processing unit 91 that supplies a control signal to the roller control motor 19 based on the detection data detected by the detection unit 90. Other configurations are the same as or equivalent to the first embodiment.
The same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 15, the bobbin type detecting section 9
Numeral 0 is disposed on the side of the wire bobbin 15, and reads a bar code 15a provided on the side surface of the wire bobbin 15 to detect the type of the wire bobbin 15. Then, the detection data output from the bobbin type detection unit 90 is given to the data processing unit 91, and the data processing unit 9
In step 1, a control signal for driving the roller control motor 19 is generated based on the detection data. The data processing section 91 is provided with a correspondence table between the type of the wire bobbin 15 and the position of the pressing roller 18b. The data processing section 91 controls the type data of the wire bobbin 15 based on the correspondence table to control the pressing roller 18b. Convert to a signal.

This control signal is sent to the data processing unit 91.
And is supplied to the roller control motor 19. The roller control motor 19 moves the pressing roller 18b continuously or stepwise based on the control signal. In this manner, even when the type of the wire bobbin 15 changes, an optimal correcting force can be applied to the wire electrode 14 wound around the wire bobbin 15,
The winding habit of the wire electrode 14 can be reliably corrected.

Embodiment 4 Next, a wire electric discharge machine according to a fourth embodiment will be described. FIG. 16 is a schematic diagram showing a wire electric discharge machine 4 according to the fourth embodiment. The fourth embodiment differs from the first embodiment shown in FIG. 1 in that, instead of the wire data input unit 20, a bobbin replacement detection unit 100 for detecting replacement of the wire bobbin 15 and a rotation amount of the wire bobbin 15 are detected. Encoder 101
And a data processing unit 102 that supplies a control signal to the roller control motor 19 based on the detection data detected by the bobbin replacement detection unit 100 and the rotation amount data detected by the encoder 101. Other configurations are the same as or equivalent to the first embodiment. In addition,
Components that are the same as or equivalent to those in Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 17, the bobbin replacement detecting section 100 is disposed opposite to the peripheral surface of the wire bobbin 15, and has a light emitting section 100a and an incident light detecting sensor 100.
b. The light emitted from the light emitting portion 100a is applied to the wire electrode 14 wound around the wire bobbin 15.
The reflected light is reflected by the surface of the
0b. Here, if the wire bobbin 15 is removed in order to replace it with a new wire bobbin, the light emitted from the light emitting unit 100a goes straight without interruption, and the reflected light does not enter the incident light detection sensor 100b.
Further, when a new wire bobbin 15 is mounted, reflected light is again incident on the incident light detection sensor 100b, and a detection signal at this time is given to the data processing unit 102.

The data processing unit 102 determines that the winding diameter of the wire electrode 14 when the detection signal is input is the largest, and instructs the roller control motor 19 to apply a weak straightening force to the wire electrode 14. Give control signal.
Thereafter, the data processing unit 102 inputs the rotation amount data detected by the encoder 101, and monitors the amount of the wire electrode 14 fed from the wire bobbin 15. And
The wire electrode 1 is adjusted according to the extension amount of the wire electrode 14.
A control signal is supplied to the roller control motor 19 so that the correction force applied to the roller 4 gradually increases. As described above, even when the strength of the winding habit of the wire electrode 14 changes due to the change in the winding diameter of the wire electrode 14, it is possible to always apply the optimum correcting force to the wire electrode 14, and
Can be reliably corrected.

It should be noted that the present invention is not limited to the above-described embodiment, but can be modified as follows, for example, without departing from the spirit of the present invention. (1) Winding diameter measuring units 80 and 8 described in the second embodiment
2 and the bobbin type detection unit 90 described in the third embodiment, and based on the data measured by the winding diameter measurement units 80 and 82 and the data detected by the bobbin type detection unit 90, a roller control motor 19 may be driven. (2) Bobbin replacement detection unit 10 described in the fourth embodiment
0, and the bobbin type detection unit 90 shown in the third embodiment, and based on the data measured by the bobbin replacement detection unit 100 and the data detected by the bobbin type detection unit 90, the roller control motor 19 It may be driven.

(3) In the first to fourth embodiments, the wire electrodes 14 are supported by the lower ends of the pair of support rollers 18a, and the wire electrodes 14 are pressed upward by the pressing rollers 18b. The wire electrode 14 may be supported by the upper end of the support roller 18a, and the wire electrode 14 may be pressed downward by the pressing roller 18b. (4) In the third embodiment, the bar code 15a provided on the side surface of the wire bobbin 15 is
, The type of the wire bobbin 15 is detected, but the type detection hole (a detection hole having a different pattern for each bobbin type) formed on the side surface of the wire bobbin 15 is read by the bobbin type detection unit 90, and the wire bobbin 15 is read. May be detected.

[0050]

The wire electric discharge machine according to the present invention is configured as described above, so that the following effects can be obtained. That is, when the wire electrode is extended from the wire bobbin, the winding diameter of the wire electrode is reduced and the winding habit of the wire electrode is increased, but by changing the position of the wire straightening roller by the roller control means, the strength of the winding habit is reduced. The combined optimal correction force can be applied to the wire electrode. As a result, the curl of the wire electrode can be reliably corrected. In the case where the wire data input means is provided, the position of the wire straightening roller is changed by the roller control means based on the data of the wire electrode input to the wire data input means, so as to match the strength of the winding habit. Optimum corrective force can be applied to the wire electrode. As a result, the curl of the wire electrode can be reliably corrected.

Further, when a winding diameter measuring means is provided, the position of the wire straightening roller is changed by the roller controlling means based on the measurement data measured by the winding diameter measuring means, so that the strength of the winding habit is reduced. The combined optimal correction force can be applied to the wire electrode. As a result, the curl of the wire electrode can be reliably corrected.
Furthermore, when the bobbin type detecting means is provided, based on the detection data detected by the bobbin type detecting means,
By changing the position of the wire straightening roller by the roller control means, it is possible to apply an optimum straightening force to the wire electrode according to the type of the wire bobbin. As a result, the curl of the wire electrode can be reliably corrected.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a wire electric discharge machine according to a first embodiment.

FIG. 2 is a sectional view showing an upper wire guide.

FIG. 3 is a sectional view showing a lower wire guide.

FIG. 4 is a cross-sectional view illustrating an automatic wire supply unit.

FIG. 5 is a cross-sectional view showing an automatic wire supply unit.

FIG. 6 is a cross-sectional view illustrating an automatic wire supply unit.

FIG. 7 is a perspective view showing a wire straightening roller according to a main part of the first embodiment.

FIG. 8 is a perspective view showing a wire straightening roller according to a main part of the first embodiment.

FIG. 9 is a perspective view showing a wire straightening roller according to a main part of the first embodiment.

FIG. 10 is a perspective view showing a wire straightening roller according to a main part of the first embodiment.

FIG. 11 is a schematic view showing a wire electric discharge machine according to a second embodiment.

FIG. 12 is a perspective view showing a wire straightening roller and a winding diameter measuring unit according to a main part of the second embodiment.

FIG. 13 is a perspective view showing a wire straightening roller and a winding diameter measuring unit according to a main part of the second embodiment.

FIG. 14 is a schematic diagram showing a wire electric discharge machine according to a third embodiment.

FIG. 15 is a perspective view showing a wire straightening roller and a bobbin type detecting unit according to a main part of the third embodiment.

FIG. 16 is a schematic view showing a wire electric discharge machine according to a fourth embodiment.

FIG. 17 is a perspective view illustrating a wire straightening roller and a bobbin replacement detecting unit according to a main part of the fourth embodiment.

[Explanation of symbols]

1, 2, 3, 4 ... wire electric discharge machine, 7 ... workpiece,
14: Wire electrode, 15: Wire bobbin, 18: Wire straightening roller, 18a: Support roller, 18b: Press roller, 19: Motor for roller control (roller control means), 2
0: wire data input unit (wire data input means), 7
0: wire feed roller (wire supply unit), 80: winding diameter measuring unit (winding diameter measuring unit), 90: bobbin type detecting unit (bobbin type detecting unit), A: wire feeding path.

Claims (8)

[Claims] 1. A wire feeder for feeding a wire electrode from a wire bobbin disposed upstream of a wire feed path and advancing the wire electrode downstream of the wire feed path. In a wire electric discharge machine for performing electric discharge machining of a workpiece using the wire electrode, a wire straightening roller installed upstream of the wire feed path and correcting a curl of the wire electrode; And a roller control means for changing a position of the wire electrode to adjust a correction force of a curl of the wire electrode. 2. The apparatus according to claim 1, further comprising wire data input means for receiving an input of a winding diameter of the wire electrode on the wire bobbin, wherein the roller control means controls the correction force based on the input data received by the wire data input means. The wire electric discharge machine according to claim 1, wherein adjustment is performed. 3. The wire data input means also receives an input of a material of a wire electrode, and the roller control means
The wire electric discharge machine according to claim 2, wherein the straightening force is adjusted based on data of a winding diameter and a material of the wire electrode. 4. A winding diameter measuring means for measuring a winding diameter of the wire electrode on the wire bobbin, wherein the roller control means adjusts the correcting force based on measurement data measured by the winding diameter measuring means. The wire electric discharge machining apparatus according to claim 1, wherein 5. The apparatus according to claim 1, further comprising a bobbin type detecting unit configured to detect a type of the wire bobbin, wherein the roller control unit adjusts the correcting force based on detection data detected by the bobbin type detecting unit. The wire electric discharge machine according to claim 1, wherein 6. The wire electric discharge machine according to claim 1, wherein the roller control means increases the straightening force in accordance with a supply amount of the wire electrode in the wire supply unit. 7. The wire straightening roller is disposed at intervals in a direction in which the wire electrode extends, and is disposed between a pair of support rollers that support the wire electrode and the pair of support rollers. The wire electric discharge machine according to any one of claims 1 to 6, further comprising a pressing roller configured to press the wire electrode supported by a supporting roller. 8. The wire straightening roller changes its position after the wire electrode is attached to the wire path,
The wire electric discharge machine according to any one of claims 1 to 7, wherein the straightening force is released while the workpiece is being machined.