WO2017072976A1 - ワイヤ放電加工機、ワイヤ放電加工機の制御装置の制御方法及び位置決め方法 - Google Patents
ワイヤ放電加工機、ワイヤ放電加工機の制御装置の制御方法及び位置決め方法 Download PDFInfo
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- WO2017072976A1 WO2017072976A1 PCT/JP2015/080852 JP2015080852W WO2017072976A1 WO 2017072976 A1 WO2017072976 A1 WO 2017072976A1 JP 2015080852 W JP2015080852 W JP 2015080852W WO 2017072976 A1 WO2017072976 A1 WO 2017072976A1
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- wire electrode
- workpiece
- wire
- capacitance
- electric discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
- B23H7/32—Maintaining desired spacing between electrode and workpiece, e.g. by means of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
- G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2500/00—Holding and positioning of tool electrodes
- B23H2500/20—Methods or devices for detecting wire or workpiece position
Definitions
- the present invention relates to a wire electric discharge machine that applies a machining voltage between a wire electrode and a workpiece to perform electric discharge machining on the workpiece, a control method of a control device of the wire electric discharge machine, and a positioning method.
- a conventional positioning method between electrodes in wire electric discharge machining is generally a method of detecting electrical contact between a wire electrode and a workpiece.
- the position of the wire electrode varies in the clearance range, which is the clearance between the wire penetration portions of the die holding the wire electrode. It is difficult to grasp accurately.
- the present invention has been made in view of the above, and an object thereof is to obtain a wire electric discharge machine capable of accurately positioning a wire electrode and a workpiece.
- the present invention includes a wire electrode that generates a discharge between a workpiece and a work voltage, and the wire electrode and the workpiece intersect with the longitudinal direction of the wire electrode.
- a driving unit that moves the wire electrode in the longitudinal direction, and a capacitance measuring unit that measures a capacitance between the wire electrode and the workpiece.
- the capacitance measuring unit measures the capacitance while moving the wire electrode and the workpiece relative to the driving unit, In a state where the wire electrode is moved in the longitudinal direction by the wire moving unit, the capacitance measuring unit is caused to measure the capacitance, and based on the measurement result of the capacitance measuring unit, the driving unit is provided with the wire electrode and the workpiece.
- a control device for adjusting the relative positions of the two is provided with the wire electrode and the workpiece.
- the wire electric discharge machine according to the present invention has an effect that the wire electrode and the workpiece can be accurately positioned.
- the figure which shows the structure of the wire electric discharge machine which concerns on Embodiment 1 of this invention The figure which shows an example of a structure of the electrostatic capacitance measurement part of the wire electric discharge machine concerning Embodiment 1 of this invention.
- required by step ST9 of FIG. The figure which shows the state which stopped the wire electrode of the wire electric discharge machine which concerns on Embodiment 1 of this invention.
- the figure which shows the state which is moving the wire electrode shown by FIG. The figure which shows the state which makes a wire electrode approach the workpiece
- FIG. 10 A perspective view which shows the wire electrode and workpiece
- a flowchart which shows an example of processing operation of a wire electric discharge machine concerning Embodiment 3 of the present invention.
- FIG. 1 is a diagram showing a configuration of a wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram illustrating an example of the configuration of the capacitance measuring unit of the wire electric discharge machine according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an example of the configuration of the control device of the wire electric discharge machine according to the first embodiment of the present invention.
- the wire electric discharge machine 1 is an apparatus for performing wire electric discharge machining on a workpiece W. As shown in FIG. 1, the wire electrode 10 serving as a discharge electrode and the wire electrode 10 are moved along the longitudinal direction of the wire electrode 10. A wire moving unit 20, a workpiece holding unit 30 that holds the workpiece W, and a drive unit 40 that relatively moves the wire electrode 10 and the workpiece W. Further, the wire electric discharge machine 1 includes a tension applying unit 50 that applies tension to the wire electrode 10, a linear scale 60 that is a measuring unit that measures the amount of movement of the work W by the driving unit 40, and the wire electrode 10 and the work W. A capacitance measuring unit 70 that measures the capacitance between the wire electrode 10 and the workpiece W is provided with a controller 100 that adjusts the relative position between the wire electrode 10 and the workpiece W.
- the wire electrode 10 generates electric discharge between the workpiece W when a machining voltage is applied.
- the wire electrode 10 is made of a conductive metal and is formed in a long shape.
- the cross-sectional shape of the wire electrode 10 is formed in a circular shape.
- the outer diameter of the wire electrode 10 is 20 ⁇ m or more and 300 ⁇ m or less.
- the wire moving unit 20 includes a wire bobbin 21 that winds and supplies the wire electrode 10, a plurality of wire feed rollers 22, a machining head 24 that includes an upper nozzle 23 that feeds the wire electrode 10 toward the workpiece W, and a wire electrode 10 and a collection roller 26 for collecting the wire electrode 10.
- the wire feed roller 22 is supported so as to be rotatable around an axis. At least one wire feed roller 22 is provided between the wire bobbin 21 and the machining head 24, and the wire electrode 10 is wound to guide the wire electrode 10 from the wire bobbin 21 to the machining head 24. At least one wire feed roller 22 is provided between the lower nozzle 25 and the collection roller 26, and the wire electrode 10 is wound to guide the wire electrode 10 from the lower nozzle 25 to the collection roller 26.
- the wire feed roller 22 rotates as the wire electrode 10 moves.
- the machining head 24 is attached to the head main body 24a through which the wire electrode 10 is passed, the contact 24b provided on the head main body 24a and in contact with the wire electrode 10, and the lower surface of the head main body 24a facing the workpiece W.
- a nozzle 23 As shown in FIG. 8, the upper nozzle 23 includes a guide hole 23 a through which the wire electrode 10 is passed. The difference between the inner diameter of the guide hole 23a and the outer diameter of the wire electrode 10 is several ⁇ m.
- the lower nozzle 25 is disposed below the upper nozzle 23 of the processing head 24. As shown in FIG. 8, the lower nozzle 25 includes a guide hole 25 a through which the wire electrode 10 is passed. The difference between the inner diameter of the guide hole 25a and the outer diameter of the wire electrode 10 is several ⁇ m.
- the upper nozzle 23 and the lower nozzle 25 support the wire electrode 10 linearly between the upper nozzle 23 and the lower nozzle 25 by passing the wire electrode 10 through the guide holes 23a and 25a.
- the upper nozzle 23 and the lower nozzle 25 are opposed to each other with an interval in the vertical direction, and support the wire electrode 10 between the upper nozzle 23 and the lower nozzle 25 in parallel with the vertical direction.
- the direction in which the upper nozzle 23 and the lower nozzle 25 face each other and the longitudinal direction of the wire electrode 10 between the upper nozzle 23 and the lower nozzle 25 may intersect the vertical direction.
- the collection roller 26 sandwiches the wire electrode 10 between the wire feed roller 22 and is rotated by a motor (not shown).
- the recovery roller 26 recovers the wire electrode 10 passed through the guide hole 23 a of the upper nozzle 23 and the guide hole 25 a of the lower nozzle 25 by being rotated by a motor when performing electrical discharge machining on the workpiece W. Further, the collection roller 26 can change the moving speed of the wire electrode 10 by changing the rotational speed of the motor.
- the work holding unit 30 is made of a conductive metal, and the outer edge has a planar shape in a square frame shape.
- the work holding unit 30 has a flat surface and is arranged in parallel with the horizontal direction.
- the work holding unit 30 passes the wire electrode 10 between the upper nozzle 23 and the lower nozzle 25 inside.
- the driving unit 40 relatively moves the wire electrode 10 and the workpiece W in a direction intersecting the longitudinal direction of the wire electrode 10 between the nozzles 23 and 25.
- the drive unit 40 includes a motor 41 incorporating an encoder, a ball screw (not shown) that is rotated around the axis by the motor 41, and a nut (not shown) that is screwed into the ball holding screw 30 and attached to the work holding unit 30.
- the motor 41 is connected to the control device 100 via the amplifier 42.
- the motor 41 rotates the ball screw around its axis.
- the encoder built in the motor 41 measures the rotation angle of the ball screw and outputs the measurement result to the control device 100.
- the drive unit 40 moves the workpiece W held by the workpiece holding unit 30 relative to the wire electrode 10 by the motor 41 rotating the ball screw around the axis.
- the drive unit 40 moves the workpiece W so that the workpiece W approaches the wire electrode 10 between the nozzles 23 and 25 or moves away from the wire electrode 10 between the nozzles 23 and 25. .
- the drive unit 40 moves the workpiece W in a direction orthogonal to the longitudinal direction of the wire electrode 10 between the nozzles 23 and 25, but the workpiece W is moved in the longitudinal direction of the wire electrode 10 between the nozzles 23 and 25. It may be moved in a direction that is not orthogonal to the direction. Further, the drive unit 40 may move both the wire electrode 10 between the nozzles 23 and 25 and the workpiece W, and the wire electrode 10 between the nozzles 23 and 25 is moved to the workpiece W without moving the workpiece W. You may move it.
- a machining voltage is applied between the wire electrode 10 and the workpiece W from the power source 80.
- the power source 80 is electrically connected to the wire electrode 10 through the contact 24 b and is connected to the work W through the work holding unit 30.
- the power supply 80 applies a machining voltage between the wire 24 and the workpiece W by applying a machining voltage between the contact 24 b and the workpiece holding unit 30.
- the machining voltage applied by the power supply 80 is a voltage that breaks the insulation between the wire electrode 10 between the nozzles 23 and 25 and the workpiece W, generates a discharge, and removes a part of the workpiece W by the discharge.
- the machining voltage is between the wire electrode 10 and the workpiece W.
- the distance between the electrodes of the wire electrode 10 and the workpiece W is not limited to 10 ⁇ m or more and 20 ⁇ m or less.
- the tension applying unit 50 applies tension to the wire electrode 10 when a machining voltage is applied to the wire electrode 10 and the workpiece W is subjected to electric discharge machining.
- the tension applying unit 50 includes a tension applying roller 51 and a motor (not shown) that can rotate the tension applying roller 51.
- the tension applying roller 51 is provided between the wire bobbin 21 and the processing head 24, and sandwiches the wire electrode 10 between the wire feed roller 22.
- the motor of the tension applying unit 50 rotates the tension applying roller 51 in a direction in which the wire electrode 10 is wound around the wire bobbin 21.
- the driving torque of the motor of the tension applying unit 50 is weaker than the driving torque of the motor that rotates the collection roller 26.
- the tension applying unit 50 causes the motor to rotate the tension applying roller 51 with a driving torque that is weaker than the driving torque of the motor that rotates the collection roller 26 when the workpiece W is subjected to electric discharge machining.
- a tension is applied along the longitudinal direction of the wire electrode 10 between the nozzles 23 and 25.
- the linear scale 60 includes a scale and a detector that is movably provided on the scale and fixed to the work holding unit 30.
- the linear scale 60 measures the amount of movement of the workpiece by measuring the amount of movement of the detector with respect to the scale, and outputs the measurement result to the control device 100.
- the measuring unit may be a unit that measures the movement amount of the workpiece W based on the drive signal of the motor 41 or the measurement result of the encoder of the motor 41.
- the capacitance measuring unit 70 includes a measurement AC power supply 71 that supplies a sine AC voltage, a DC component blocking capacitor 72 connected to one end of the AC power supply 71, and an AC power supply 71.
- a current detection resistor 73 connected to the other grounded end of the current detection resistor 73, and a rectifier circuit 74 that converts an alternating voltage at a terminal of the current detection resistor 73 not grounded into a voltage amplitude value and outputs the voltage amplitude value to the control device 100.
- the DC component blocking capacitor 72 is connected to the wire electrode 10 through the contact 24 b, and the current detection resistor 73 is connected to the work W through the work holding unit 30.
- the capacitance measuring unit 70 measures a voltage value corresponding to the capacitance between the wire electrode 10 and the workpiece W.
- the capacitance measuring unit 70 outputs the measurement result to the control device 100.
- the control device 100 is a numerical control device, and as shown in FIG. 3, an arithmetic device 101 such as a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a hard disk drive, It is comprised by the storage device or the non-volatile storage device which combined these, and comprised by the computer provided with the memory
- the arithmetic device 101 executes a numerical control program held in the storage device 102 to generate machining conditions, and outputs the machining conditions to each part of the wire electric discharge machine 1, whereby the wire electric discharge machine 1. Control the operation of each part.
- the control device 100 positions the workpiece W with respect to the wire electrode 10 when the arithmetic device 101 executes a numerical control program held in the storage device 102. Thereafter, the control device 100 generates electric discharge between the wire electrode 10 and the workpiece W to perform electric discharge machining on the workpiece W.
- information necessary for generating the machining conditions is input to the control device 100 from the input device 104 connected to the input / output unit 103.
- the input device 104 is configured by a touch panel, a keyboard, a mouse, a trackball, or a combination thereof.
- FIG. 4 is a flowchart showing an example of the machining operation of the wire electric discharge machine according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram illustrating an example of the measurement result acquired in step ST5 of FIG.
- FIG. 6 is a diagram illustrating an example of calibration data acquired from the measurement results illustrated in FIG.
- FIG. 7 is a diagram illustrating an example of the capacitance corresponding to the distance between the wire electrode and the workpiece obtained in step ST9 of FIG.
- FIG. 5 is a diagram illustrating an example of the measurement result acquired in step ST5 of FIG.
- FIG. 6 is a diagram illustrating an example of calibration data acquired from the measurement results illustrated in FIG.
- FIG. 7 is a diagram illustrating an example of the capacitance corresponding to the distance between the wire electrode and the workpiece obtained in step ST9 of FIG.
- FIG. 8 is a diagram showing a state in which the wire electrode of the wire electric discharge machine according to Embodiment 1 of the present invention is stopped.
- FIG. 9 is a diagram showing a state in which the wire electrode shown in FIG. 8 is moved.
- FIG. 10 is a diagram illustrating a state in which the wire electrode is brought close to the workpiece of the comparative example of the wire electric discharge machine according to the first embodiment.
- FIG. 11 is a diagram illustrating a state in which the wire electrode is brought into contact with the workpiece of the comparative example illustrated in FIG. 10.
- FIG. 12 is a diagram illustrating a state in which the comparative example illustrated in FIG. 10 can detect that the workpiece has contacted the ultrafine wire electrode.
- the wire electric discharge machine 1 starts a machining operation when information necessary for generating machining conditions is input from the input device 104 to the control device 100 and a machining start command is inputted.
- the control device 100 of the wire electric discharge machine 1 positions the wire electrode 10 and the workpiece W based on the input information. After positioning the wire electrode 10 and the workpiece W, the control device 100 generates a machining condition based on the input information, and the generated machining condition is used as the driving unit 40, the wire moving unit 20, the driving unit 40, and the power source 80. Output to.
- the power source 80 applies a machining voltage between the wire electrode 10 and the workpiece W, generates electric discharge between the wire electrode 10 and the workpiece W, and performs electric discharge machining on the workpiece W. Apply.
- the wire electric discharge machine 1 performs positioning of the wire electrode 10 and the workpiece W when the control device 100 receives a machining start command input from the input device 104 after the workpiece W is held by the workpiece holding unit 30. (Step ST1).
- the control device 100 first causes the wire moving unit 20 to stop moving the wire electrode 10 (step ST2).
- the control device 100 causes the drive unit 40 to move the workpiece W in a direction approaching the wire electrode 10 (step ST3).
- the control device 100 determines whether or not the workpiece W has contacted the wire electrode 10 based on the measurement result of the capacitance measuring unit 70 (step ST4).
- the control device 100 determines that the workpiece W has contacted the wire electrode 10 and the capacitance measuring unit. If the electrostatic capacitance between the wire electrode 10 and the workpiece W detected by 70 is not zero, it is determined that the workpiece W is not in contact with the wire electrode 10.
- Control device 100 will return to Step ST3, if it judges with work W not contacting wire electrode 10 (Step ST4: No).
- the control device 100 causes the drive unit 40 to stop moving the workpiece W, and then causes the drive unit 40 to move the workpiece W from the wire electrode 10 to the drive unit 40. While moving away, the relationship between the position of the workpiece W and the capacitance between the wire electrode 10 and the workpiece W is acquired (step ST5).
- the control device 100 associates the detection result of the linear scale 60 with the capacitance between the wire electrode 10 and the workpiece W, which is the measurement result of the capacitance measuring unit 70, on a one-to-one basis.
- the control device 100 uses the least square method based on the relationship acquired in FIG. 5, and the distance between the electrodes of the wire electrode 10 and the workpiece W and the distance between the wire electrode 10 and the workpiece W as shown in FIG. 6.
- Calibration data K that defines the relationship with the electrostatic capacity is acquired and stored.
- the wire electric discharge machine 1 causes the drive unit 40 to move the wire electrode 10 and the workpiece W in a state where the movement of the wire electrode 10 in the longitudinal direction is stopped by the control device 100 executing the processing from step ST1 to step ST5.
- the capacitance measuring unit 70 is caused to measure the capacitance while relatively moving the.
- the control device 100 acquires the calibration data K from the measurement result measured by the capacitance measuring unit 70 when the capacitance measuring unit 70 measures the capacitance by executing the process of step ST5. To do.
- the control apparatus 100 makes the workpiece
- step ST5 the capacitance measuring unit 70 is moved while the wire electrode 10 and the workpiece W are relatively moved by the driving unit 40 in a state where the movement of the wire electrode 10 in the longitudinal direction is stopped.
- the calibration data acquisition step S1 for measuring the capacitance is configured.
- the control device 100 determines whether or not the workpiece W has moved backward from the wire electrode 10 by a specified distance (step ST6).
- the wire electrode 10 comes into contact with the inner surfaces of the guide holes 23a and 25a of the nozzles 23 and 25, and as shown by the solid line in FIG. , 25 vibrate in a range of 10 ⁇ m at maximum in a direction orthogonal to the moving direction of the wire electrode 10.
- the designated distance is set based on the vibration range of the wire electrode 10 moved by the wire moving unit 20.
- the specified distance is 10 ⁇ m, which is the maximum range in which the wire electrode 10 vibrates, but the specified distance is not limited to 10 ⁇ m.
- step ST6 When the control device 100 determines that the workpiece W has retracted from the wire electrode 10 by a specified distance (step ST6: Yes), the control device 100 causes the driving unit 40 to stop moving the workpiece W, and causes the tension applying unit 50 to discharge the wire electrode 10. A tension having the same strength as that at the time of machining is applied, and the wire electrode 10 is moved to the wire moving unit 20 at the same speed as at the time of electric discharge machining (step ST7).
- the wire electrode 10 whose movement by the wire moving unit 20 is stopped is applied with the same tension as that during the electric discharge machining by the tension applying unit 50 from the position indicated by the solid line in FIG.
- the control device 100 Based on the measurement result of the capacitance measuring unit 70, the control device 100 does not contact the workpiece W with the wire electrode 10, and the capacitance changes within the range H shown in FIG.
- the workpiece W is moved closer to the wire electrode 10 so that the workpiece W is positioned at the position H and is positioned within the range H shown in FIG. 6, the movement of the workpiece W is stopped (step ST8).
- the control device 100 causes the capacitance measuring unit 70 to measure the capacitance between the wire electrode 10 and the workpiece W. At this time, the wire electrode 10 vibrates in the direction orthogonal to the longitudinal direction of the wire electrode 10 because the center of the guide holes 23a, 25a of the nozzles 23, 25 vibrates as shown by the solid line in FIG. As shown in FIG. 7, the capacitance with W increases and decreases with the passage of time.
- the control device 100 obtains an average value of the measured capacitance, and sets this average value as a value Cx of the capacitance between the wire electrode 10 and the workpiece W shown in FIG. In Embodiment 1, in Embodiment 1, the average value of capacitance is an arithmetic average value.
- the control device 100 moves the wire electrode 10 moving in the longitudinal direction.
- the distance between the electrodes and the workpiece W is obtained (step ST9).
- the control device 100 obtains the inter-electrode distance Dx between the wire electrode 10 and the workpiece W, which has the capacitance value Cx, in the calibration data K shown in FIG.
- the distance between the electrode 10 and the workpiece W is defined as the distance between the electrodes.
- the control device 100 determines the pole from the wire electrode 10 corresponding to the machining conditions set during the electric discharge machining.
- the workpiece W is moved to the drive unit 40 to a position that is a distance (step ST10).
- the control device 100 obtains a difference between the distance between the electrode between the wire electrode 10 and the workpiece W obtained at step ST9 and the distance between the electrode between the wire electrode 10 and the workpiece W corresponding to the processing conditions.
- the workpiece W is moved to the drive unit 40 in a direction in which the value of zero becomes zero, and the amount of movement of the workpiece W is set to a value corresponding to the above-described difference from the detection result of the linear scale 60.
- the control device 100 completes the positioning of the wire electrode 10 and the workpiece W. Thereafter, the control device 100 causes the capacitance measuring unit 70 to stop measuring the capacitance, causes the power supply 80 to apply a machining voltage between the wire electrode 10 and the workpiece W according to the machining conditions, and applies the workpiece W to the workpiece W. Apply electrical discharge machining.
- a machining liquid composed of pure water or machining oil is supplied between the wire electrode 10 and the workpiece W.
- the control device 100 executes the processing from step ST ⁇ b> 6 to step ST ⁇ b> 10, so that the capacitance is applied to the capacitance measuring unit 70 while moving the wire electrode 10 in the longitudinal direction to the wire moving unit 20. Based on the measurement result of the capacitance measuring unit 70, the driving unit 40 adjusts the relative position between the wire electrode 10 and the workpiece W. Further, the control device 100 performs electric discharge machining on the wire electrode 10 in the tension applying unit 50 when the drive unit 40 adjusts the relative position between the wire electrode 10 and the workpiece W by executing the process of step ST7. Apply the same strength of tension.
- control device 100 executes the process of step ST9 so that when the drive unit 40 adjusts the relative position between the wire electrode 10 and the workpiece W, the electrostatic capacitance that is a measurement result of the capacitance measuring unit 70 is obtained. Based on the capacitance value Cx and the calibration data K, a distance between the electrodes of the wire electrode 10 moving in the longitudinal direction and the workpiece W is obtained. Further, in the processing from step ST6 to step ST10, in the state where the wire electrode 10 is moved in the longitudinal direction by the wire moving unit 20, the capacitance measuring unit 70 measures the capacitance and the driving unit 40 causes the wire electrode 10 to move. And adjusting step S2 for adjusting the relative position between the workpiece W and the workpiece W.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are configured such that the distance between the electrode between the wire electrode 10 and the workpiece W is set between the wire electrode 10 and the workpiece W. Obtained based on the capacitance of For this reason, in the control method and the positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment, the capacitance changes due to the change in the interelectrode distance between the wire electrode 10 and the workpiece W, and the wire electrode 10 10 and 11 that detect the position where the wire electrode 10 and the workpiece W are in contact with each other due to electrical conduction between the wire electrode 10 and the workpiece W.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to Embodiment 1 can accurately position the wire electrode 10 and the workpiece W.
- the comparative example shown in FIGS. 10, 11 and 12 is a case where the wire electrode 10 is an extra fine wire 10S having an outer diameter of 70 ⁇ m or less.
- the work W is further moved closer to the fine wire 10S, and as shown in FIG. 12, the work W is moved closer to the fine wire 10S than the contacted position shown in FIG. It detects that line 10S and work W contacted.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are such that even if the wire electrode 10 is the extra fine wire 10S, the extra fine wire 10S and the work W Since the electrostatic capacitance between the extra fine wire 10S and the workpiece W immediately becomes zero, the position where the extra fine wire 10S and the workpiece W contact each other can be accurately detected. The distance between the electrodes can be accurately measured.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are based on the distance between the electrode between the wire electrode 10 and the workpiece W and the electrostatic capacitance between the wire electrode 10 and the workpiece W. Find based on capacity.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 accurately grasp the distance between the electrode between the wire electrode 10 and the workpiece W even when processing oil is used as the processing fluid.
- the wire electrode 10 and the workpiece W can be accurately positioned.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to Embodiment 1 are performed in a direction crossing the longitudinal direction of the wire electrode 10 in a state where the movement of the wire electrode 10 in the longitudinal direction is stopped.
- the capacitance measuring unit 70 is caused to measure the capacitance between the wire electrode 10 and the workpiece W while relatively moving the wire electrode 10 and the workpiece W.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are such that when the wire electrode 10 is moved in the longitudinal direction, the wire electrode 10 Since measurement is performed in a stopped state, an accurate relationship between the distance between the electrode between the wire electrode 10 and the workpiece W and the capacitance between the wire electrode 10 and the workpiece W can be acquired.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are the same as the wire electrode 10 and the capacitance measuring unit 70 in the state where the movement of the wire electrode 10 in the longitudinal direction is stopped. After the capacitance between the workpiece W and the workpiece W is measured, the capacitance measuring unit 70 is caused to measure the capacitance while moving the wire electrode 10 in the longitudinal direction by the wire moving unit 20, and the wire electrode 10 and the workpiece are measured. The relative position with W is adjusted. Therefore, even if the relative position between the wire electrode 10 and the workpiece W is shifted between the state in which the wire electrode 10 is stopped and the state in which the wire electrode 10 is moved, the wire electrode 10 is positioned before the wire electrode 10 is positioned.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to Embodiment 1 can accurately position the wire electrode 10 and the workpiece W.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are the same as the wire electrode 10 and the capacitance measuring unit 70 in the state where the movement of the wire electrode 10 in the longitudinal direction is stopped.
- Calibration data K that defines the relationship between the distance between the electrode 10 and the workpiece W and the capacitance between the wire electrode 10 and the workpiece W by measuring the capacitance between the workpiece W and the workpiece W. get.
- the wire electrode 10 stops. Since the relative position between the wire electrode 10 and the workpiece W is adjusted based on the calibration data K acquired in this state, the wire electrode 10 and the workpiece W can be accurately positioned.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are based on the calibration data K acquired in a state where the movement of the wire electrode 10 in the longitudinal direction is stopped. And the workpiece W are positioned. For this reason, the control method and the positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment use the calibration data K acquired using the wire electrode 10 and the workpiece W used in actual machining. Even if at least one of the shape of the wire electrode 10 and the workpiece W changes variously, the wire electrode 10 and the workpiece W can be accurately positioned.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 are the distance between the electrode between the wire electrode 10 and the workpiece W and the electrostatic capacitance between the wire electrode 10 and the workpiece W.
- the wire electrode 10 After acquiring the relationship with the capacity, the wire electrode 10 is moved in the longitudinal direction, and the distance between the electrodes of the wire electrode 10 and the workpiece W is obtained. Therefore, even if the relative position between the wire electrode 10 and the workpiece W is shifted between the state in which the wire electrode 10 is stopped and the state in which the wire electrode 10 is moved, the longitudinal direction before positioning the wire electrode 10 is increased. A distance between the electrodes of the wire electrode 10 moving in the direction and the workpiece W can be obtained.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment move the wire electrode 10 in the same manner as during electric discharge machining before positioning the wire electrode 10 and the workpiece W. Therefore, the distance between the electrodes of the wire electrode 10 and the workpiece W during electric discharge machining can be measured, and the wire electrode 10 and the workpiece W can be accurately positioned.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are such that the distance between the electrodes of the moving wire electrode 10 and the workpiece W is measured by the capacitance measuring unit 70.
- the value Cx which is the average value of the electrostatic capacitance as a result is obtained.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment accurately determine the distance between the wire electrode 10 and the workpiece W even when the moving wire electrode 10 vibrates. Therefore, the wire electrode 10 and the workpiece W can be accurately positioned.
- control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are configured such that the distance between the electrodes of the moving wire electrode 10 and the workpiece W is determined by the tension applying unit 50. Measured in a state where the same tension is applied to that of EDM. For this reason, even if the relative positions of the wire electrode 10 and the workpiece W are shifted between the state in which the tension is applied to the wire electrode 10 and the state in which the tension is not applied to the wire electrode 10, before the wire electrode 10 is positioned. Moreover, the distance between the electrodes of the wire electrode 10 moving in the longitudinal direction and the workpiece W can be accurately obtained.
- the wire electric discharge machine 1 and the control method and positioning method of the control device 100 according to the first embodiment are configured so that the wire electrode 10 and the workpiece W are subjected to the same tension as during electric discharge machining before the wire electrode 10 and the workpiece W are positioned. Therefore, the distance between the electrodes of the wire electrode 10 and the workpiece W at the time of electric discharge machining can be measured, and the wire electrode 10 and the workpiece W can be accurately positioned.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to the first embodiment are the distance between the electrode between the wire electrode 10 and the workpiece W and the capacitance between the wire electrode 10 and the workpiece W.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 measure the distance between the electrodes of the wire electrode 10 and the workpiece W with reference to the position where the wire electrode 10 and the workpiece W are in contact. be able to.
- the control method and positioning method of the wire electric discharge machine 1 and the control device 100 according to Embodiment 1 can accurately position the wire electrode 10 and the workpiece W.
- FIG. 13 is a perspective view showing the wire electrode and the workpiece before the first cut of the wire electric discharge machine according to Embodiment 2 of the present invention.
- FIG. 14 is a perspective view showing the wire electrode and the workpiece before the second cut of the wire electric discharge machine according to Embodiment 2 of the present invention.
- the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the wire electric discharge machine 1 according to the second embodiment has the same configuration as that of the first embodiment.
- the wire electric discharge machine 1 shown in FIGS. 13 and 14 according to the second embodiment performs a first cut that cuts the workpiece W by electric discharge machining, and then applies a machining voltage lower than that of the first cut to the wire electrode 10 and the workpiece.
- the second cut is performed between the wire electrode 10 and the workpiece W relative to each other along the same path as the first cut.
- the wire electric discharge machine 1 finishes the surface processed by the first cut in the second cut.
- the wire electric discharge machine 1 has a machining accuracy due to at least one of a temperature rise of the machining liquid supplied between the wire electrode 10 and the workpiece W and an internal strain generated in the workpiece W. May decrease.
- the control device 100 of the wire electric discharge machine 1 according to the second embodiment sets the relative position of the wire electrode 10 with respect to an arbitrary position of the workpiece W before the first cut and before the second cut. Measured according to the measurement results.
- the control device 100 of the wire electric discharge machine 1 according to the second embodiment compares the measurement result before the first cut with the measurement result before the second cut, and compares the measurement result between the wire electrode 10 and the workpiece W at the first cut. Measure the misalignment.
- the control device 100 of the wire electric discharge machine 1 according to the second embodiment corrects a path for relatively moving the wire electrode 10 and the workpiece W in consideration of the positional deviation during the second cut.
- the wire electric discharge machine 1 according to the second embodiment performs the same operation as that of the first embodiment except that the path for relatively moving the wire electrode 10 and the workpiece W is corrected during the second cut.
- the calibration data in a state in which the movement of the wire electrode 10 in the longitudinal direction is stopped as in the first embodiment. Get K. Thereafter, the wire electrode 10 is moved in the longitudinal direction, and the distance between the electrodes of the wire electrode 10 and the workpiece W is obtained based on the calibration data K. As a result, the wire electric discharge machine 1 according to the second embodiment can accurately position the wire electrode 10 and the workpiece W as in the first embodiment.
- the wire electric discharge machine 1 according to Embodiment 2 corrects the path for relatively moving the wire electrode 10 and the workpiece W at the time of the second cut, it is possible to suppress a decrease in machining accuracy.
- FIG. 15 is a flowchart showing an example of the machining operation of the wire electric discharge machine according to Embodiment 3 of the present invention.
- the same parts as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the wire electric discharge machine 1 according to the third embodiment has the same configuration as that of the first embodiment.
- the control device 100 of the wire electric discharge machine 1 according to Embodiment 3 moves the workpiece W in the direction approaching the wire electrode 10 after moving the workpiece W in the direction approaching the wire electrode 10 (step ST3).
- the calibration data K is acquired and stored (step ST5).
- the control device 100 determines whether or not the workpiece W is in contact with the wire electrode 10 based on the measurement result of the capacitance measuring unit 70 while acquiring the calibration data K (step ST4). If it determines with the workpiece
- the calibration data is stopped in a state in which the movement of the wire electrode 10 in the longitudinal direction is stopped as in the first embodiment. Get K. Thereafter, the wire electrode 10 is moved in the longitudinal direction, and the distance between the electrodes of the wire electrode 10 and the workpiece W is obtained based on the calibration data K. As a result, the wire electric discharge machine 1 according to the third embodiment can accurately position the wire electrode 10 and the workpiece W as in the first embodiment.
- the wire electric discharge machine 1 according to Embodiment 3 acquires the calibration data K until the workpiece W comes into contact with the wire electrode 10 while bringing the workpiece W close to the wire electrode 10.
- the wire electric discharge machine 1 according to the third embodiment can reduce the time required for positioning the wire electrode 10 and the workpiece W.
- FIG. 16 is a diagram illustrating an example of a distance between the electrodes of the wire electrode and the workpiece obtained by the control device for the wire electric discharge machine according to the fourth embodiment of the present invention.
- the wire electric discharge machine 1 according to the fourth embodiment has the same configuration as that of the first embodiment.
- the control device 100 of the wire electric discharge machine 1 according to Embodiment 4 uses the wire electrode 10 measured by the capacitance measuring unit 70 when determining the interelectrode distance between the wire electrode 10 and the workpiece W in step ST9. Based on the calibration data K, the capacitance between the workpiece W and the workpiece W is converted into a distance between the electrodes of the wire electrode 10 and the workpiece W. As shown in FIG. 16, the control device 100 acquires the distance between the electrodes of the wire electrode 10 and the workpiece W that changes with the passage of time.
- the control device 100 obtains an average value of the acquired inter-electrode distances, and sets this average value as the inter-electrode distance Dx between the wire electrode 10 and the workpiece W.
- the acquired average value of the distances between the poles is an arithmetic average value.
- the control device 100 controls each part of the wire electric discharge machine 1 as in the first embodiment except for step ST9.
- the calibration data is stopped in a state in which the movement of the wire electrode 10 in the longitudinal direction is stopped as in the first embodiment. Get K. Thereafter, the wire electrode 10 is moved in the longitudinal direction, and the distance between the electrodes of the wire electrode 10 and the workpiece W is obtained based on the calibration data K. As a result, the wire electric discharge machine 1 according to the fourth embodiment can accurately position the wire electrode 10 and the workpiece W as in the first embodiment.
- the wire electric discharge machine 1 according to the fourth embodiment uses the capacitance measured by the capacitance measuring unit 70 when the distance between the electrodes of the wire electrode 10 and the workpiece W is determined in step ST9.
- the distance between the electrodes 10 and the workpiece W is converted into the distance between the electrodes, and the average value of the distance between the electrodes is defined as the distance Dx between the wires 10 and the workpiece W.
- the wire electric discharge machine 1 according to the fourth embodiment can accurately determine the inter-electrode distance between the wire electrode 10 and the workpiece W, and can accurately position the wire electrode 10 and the workpiece W. .
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
- 1 wire electric discharge machine 10 wire electrode, 20 wire moving unit, 40 driving unit, 50 tension applying unit, 70 capacitance measuring unit, 100 control device, W work.
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Abstract
Description
図1は、本発明の実施の形態1に係るワイヤ放電加工機の構成を示す図である。図2は、本発明の実施の形態1にかかるワイヤ放電加工機の静電容量測定部の構成の一例を示す図である。図3は、本発明の実施の形態1にかかるワイヤ放電加工機の制御装置の構成の一例を示す図である。
次に、本発明の実施の形態2に係るワイヤ放電加工機1を図面に基づいて説明する。図13は、本発明の実施の形態2に係るワイヤ放電加工機のファーストカット前のワイヤ電極とワークとを示す斜視図である。図14は、本発明の実施の形態2に係るワイヤ放電加工機のセカンドカット前のワイヤ電極とワークとを示す斜視図である。図13及び図14において、実施の形態1と同一部分には、同一符号を付して説明を省略する。
次に、本発明の実施の形態3に係るワイヤ放電加工機1を図面に基づいて説明する。図15は、本発明の実施の形態3に係るワイヤ放電加工機の加工動作の一例を示すフローチャートである。図15において、実施の形態1と同一部分には、同一符号を付して説明を省略する。
次に、本発明の実施の形態4に係るワイヤ放電加工機1を図面に基づいて説明する。図16は、本発明の実施の形態4に係るワイヤ放電加工機の制御装置が求めたワイヤ電極とワークとの極間距離の一例を示す図である。
Claims (7)
- 前記ワイヤ電極と前記ワークとを前記ワイヤ電極の長手方向と交差する方向に相対的に移動させる駆動部と、
前記ワイヤ電極を前記長手方向に移動させるワイヤ移動部と、
前記ワイヤ電極と前記ワークとの間の静電容量を測定する静電容量測定部と、
前記ワイヤ電極の前記長手方向の移動を停止させた状態で、前記駆動部に前記ワイヤ電極と前記ワークとを相対的に移動させながら前記静電容量測定部に前記静電容量を測定させた後、前記ワイヤ移動部に前記ワイヤ電極を前記長手方向に移動させた状態で、前記静電容量測定部に前記静電容量を測定させて、静電容量測定部の測定結果に基づいて、前記駆動部に前記ワイヤ電極と前記ワークとの相対位置を調整させる制御装置と、
を備えることを特徴とするワイヤ放電加工機。 - 前記ワイヤ電極に前記長手方向に沿って張力を付与する張力付与部を備え、
前記制御装置は、前記ワイヤ移動部に前記ワイヤ電極を前記長手方向に移動させた状態で、前記静電容量測定部に前記静電容量を測定させて、前記駆動部に前記ワイヤ電極と前記ワークとの相対位置を調整させる際に、前記張力付与部に前記ワイヤ電極に放電加工を施す際と同じ張力を付与させることを特徴とする請求項1に記載のワイヤ放電加工機。 - 前記制御装置は、
前記ワイヤ電極の前記長手方向の移動を停止させた状態で、前記駆動部に前記ワイヤ電極と前記ワークとを相対的に移動させながら前記静電容量測定部に前記静電容量を測定させる際に、前記静電容量測定部が測定した測定結果から前記ワイヤ電極と前記ワークとの距離と、前記静電容量との関係を規定する校正データを取得することを特徴とする請求項2に記載のワイヤ放電加工機。 - 前記制御装置は、
前記ワイヤ電極の前記長手方向の移動を停止させた状態で、前記駆動部が前記ワイヤ電極と前記ワークとを相対的に移動させながら前記静電容量測定部に前記静電容量を測定させる際に、前記ワイヤ電極に前記ワークを接触させることを特徴とする請求項3に記載のワイヤ放電加工機。 - 前記制御装置は、
前記ワイヤ移動部に前記ワイヤ電極を前記長手方向に移動させた状態で、前記静電容量測定部に前記静電容量を測定させて、前記駆動部に前記ワイヤ電極と前記ワークとの相対位置を調整させる際に、前記静電容量測定部の測定結果と、前記校正データとに基づいて、前記長手方向に移動中の前記ワイヤ電極と前記ワークとの距離を求めることを特徴とする請求項4に記載のワイヤ放電加工機。 - 加工電圧が印加されてワークとの間に放電を発生させるワイヤ電極と、前記ワイヤ電極と前記ワークとを前記ワイヤ電極の長手方向と交差する方向に相対的に移動させる駆動部と、前記ワイヤ電極を前記長手方向に移動させるワイヤ移動部と、前記ワイヤ電極と前記ワークとの間の静電容量を測定する静電容量測定部と、を備えるワイヤ放電加工機の制御装置の制御方法であって、
前記ワイヤ電極の前記長手方向の移動を停止させた状態で、前記駆動部に前記ワイヤ電極と前記ワークとを相対的に移動させながら前記静電容量測定部に前記静電容量を測定させる校正データ取得ステップと、
前記ワイヤ移動部に前記ワイヤ電極を前記長手方向に移動させた状態で、前記静電容量測定部に前記静電容量を測定させて、前記駆動部に前記ワイヤ電極と前記ワークとの相対位置を調整させる調整ステップと、
を備えることを特徴とするワイヤ放電加工機の制御装置の制御方法。 - 加工電圧が印加されてワークとの間に放電を発生するワイヤ電極の長手方向の移動を停止させた状態で、前記ワイヤ電極と前記ワークとを前記長手方向と交差する方向に相対的に移動させながら前記ワイヤ電極と前記ワークとの間の静電容量を測定させる校正データ取得ステップと、
前記ワイヤ電極を前記長手方向に沿って移動させた状態で、前記ワイヤ電極と前記ワークとの間の静電容量を測定して、前記長手方向と交差する方向の前記ワイヤ電極と前記ワークとの相対位置を調整する調整ステップと、
を備えることを特徴とする位置決め方法。
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| US15/300,920 US20170266744A1 (en) | 2015-10-30 | 2015-10-30 | Wire electric discharge machine, control method of control device of wire electric discharge machine, and positioning method |
| PCT/JP2015/080852 WO2017072976A1 (ja) | 2015-10-30 | 2015-10-30 | ワイヤ放電加工機、ワイヤ放電加工機の制御装置の制御方法及び位置決め方法 |
| JP2016528256A JP6017096B1 (ja) | 2015-10-30 | 2015-10-30 | ワイヤ放電加工機、ワイヤ放電加工機の制御装置の制御方法及び位置決め方法 |
| DE112015001760.7T DE112015001760B4 (de) | 2015-10-30 | 2015-10-30 | Drahterodiermaschine, Steuerungsverfahren einer Steuerung einer Drahterodiermaschine und Positionierungsverfahren |
| CN201580017892.9A CN107073614B (zh) | 2015-10-30 | 2015-10-30 | 线放电加工机、线放电加工机的控制装置的控制方法及定位方法 |
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- 2015-10-30 US US15/300,920 patent/US20170266744A1/en not_active Abandoned
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Also Published As
| Publication number | Publication date |
|---|---|
| DE112015001760B4 (de) | 2023-08-10 |
| JP6017096B1 (ja) | 2016-10-26 |
| JPWO2017072976A1 (ja) | 2017-10-26 |
| US20170266744A1 (en) | 2017-09-21 |
| DE112015001760T5 (de) | 2017-07-06 |
| CN107073614A (zh) | 2017-08-18 |
| CN107073614B (zh) | 2019-01-04 |
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