WO2022181368A1 - 断線位置推定装置および断線位置推定方法 - Google Patents
断線位置推定装置および断線位置推定方法 Download PDFInfo
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- WO2022181368A1 WO2022181368A1 PCT/JP2022/005533 JP2022005533W WO2022181368A1 WO 2022181368 A1 WO2022181368 A1 WO 2022181368A1 JP 2022005533 W JP2022005533 W JP 2022005533W WO 2022181368 A1 WO2022181368 A1 WO 2022181368A1
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- wire
- wire electrode
- disconnection
- torque
- position estimation
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- 229910021641 deionized water Inorganic materials 0.000 description 1
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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
- B23H7/02—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
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/101—Supply of working media
-
- 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
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
-
- 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
- B23H7/104—Wire tension control
-
- 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
-
- 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
- B23H7/102—Automatic wire threading
Definitions
- the present invention relates to a wire electric discharge machine, and more particularly to a wire breakage position estimation device and a wire breakage position estimation method for estimating wire breakage positions of wire electrodes.
- Japanese Patent Application Laid-Open No. 2019-217559 discloses a prior art related to a wire electric discharge machine. The prior art aims to calculate the wire break position of the wire electrode.
- Japanese Unexamined Patent Application Publication No. 2019-217559 discloses a tip detection electrode according to the prior art. A tip detection electrode is installed in the transport path of the wire electrode. A tip detection electrode contacts the wire electrode. The voltage of the tip detection electrode changes depending on whether the tip detection electrode and the wire electrode are in contact.
- the tip detection electrode according to the prior art is installed upstream from the disconnection position of the wire electrode.
- the wire electrode is unwound when disconnection occurs.
- the prior art detects the position where the unwound wire electrode stops contacting the tip detection electrode based on the change in the tip detection electrode voltage. That is, the prior art detects the tip position of the wire electrode based on changes in the tip detection electrode voltage.
- the disconnection position of the wire electrode is calculated based on the tip position of the wire electrode and the unwinding amount of the wire electrode.
- JP-A-2019-217559 has at least the following problems. That is, the operator must install the tip detection electrode in the transport path of the wire electrode. In other words, the number of steps for the operator's setup work increases. Further, when the wire electrode is disconnected upstream of the tip detection electrode, the tip of the wire electrode is already upstream of the tip detection electrode at the time when unwinding is started. Therefore, it is impossible for the tip of the unwound wire electrode to reach the tip detection electrode. Therefore, the disconnection position cannot be calculated by the technique disclosed in Japanese Patent Application Laid-Open No. 2019-217559. Furthermore, in order to detect the tip of the wire electrode, the wire electrode must be unwound (reversely run) in the direction opposite to the time of delivery. If the wire electrode is run in the reverse direction, the wire electrode may become entangled in the beat.
- An object of the present invention is to provide a wire breakage position estimation device and a wire breakage position estimation method that reliably estimate the wire breakage position of a wire electrode while omitting the tip detection electrode.
- a first aspect of the present invention is a wire breakage position estimating device for estimating a wire breakage position of a wire electrode in a wire electric discharge machine, wherein the wire electric discharge machine is sent toward a workpiece to a winding roller that winds the wire electrode that has passed through; a winding motor that drives the winding roller; and a sensor that outputs a detection signal according to the driving of the shaft of the winding motor,
- the position estimating device includes a torque acquisition unit that acquires the torque of the winding motor based on the detection signal, and the wire electrode that is wound by the winding roller based on the torque when the wire electrode is disconnected.
- a determination unit for determining whether or not the trailing end has passed the winding roller; a rotation angle acquisition unit for acquiring the rotation angle of the winding motor based on the detection signal; a wire breakage position estimating unit for estimating the wire breakage position of the wire electrode based on the rotation angle of the winding motor from when it is determined that the trailing end of the wire electrode has passed the winding roller.
- a second aspect of the present invention is a wire breakage position estimating method for estimating a wire breakage position of a wire electrode in a wire electric discharge machine, wherein the wire electric discharge machine is sent toward a workpiece to a winding roller that winds the wire electrode that has passed through; a winding motor that drives the winding roller; and a sensor that outputs a detection signal according to the driving of the shaft of the winding motor,
- the position estimation method includes a rotation angle acquisition step of acquiring the rotation angle of the winding motor based on the detection signal of the sensor, and a torque acquisition step of acquiring the torque of the winding motor based on the detection signal of the sensor.
- a wire breakage position estimation device and a wire breakage position estimation method that reliably estimate the wire breakage position of a wire electrode while omitting the tip detection electrode.
- FIG. 1 is a configuration diagram of a wire electric discharge machine according to an embodiment.
- FIG. 2 is a configuration diagram of a feed mechanism according to the embodiment.
- FIG. 3 is a configuration diagram of the disconnection position estimation device according to the embodiment.
- FIG. 4A is a diagram illustrating the feeding mechanism when the wire electrode is broken.
- FIG. 4B is a diagram illustrating the feed mechanism after time has passed since FIG. 4A and the broken wire electrode has passed through the take-up roller and the pinch roller.
- FIG. 5 is a graph simply illustrating changes in the torque of the winding motor before and after the trailing end of the wire electrode passes the winding roller.
- FIG. 6 is a flowchart illustrating the flow of the disconnection position estimation method according to the embodiment.
- FIG. 6 is a flowchart illustrating the flow of the disconnection position estimation method according to the embodiment.
- FIG. 7 is a configuration diagram of a wire breakage position estimation device according to Modification 1.
- FIG. 8 is a diagram illustrating a plurality of sections defined on the delivery path of the wire electrode.
- FIG. 9 is a diagram exemplifying a table that defines correspondence relationships between a plurality of sections in FIG. 8 and the causes of wire breakages that can occur in each section and coping methods.
- FIG. 10 is a flowchart illustrating the flow of the disconnection position estimation method according to Modification 1. As shown in FIG.
- FIG. 1 is a configuration diagram of a wire electric discharge machine 10 according to an embodiment.
- FIG. 1 not only the wire electric discharge machine 10 but also the X-axis, Y-axis, and Z-axis are illustrated.
- the X-axis, Y-axis, and Z-axis are orthogonal to each other.
- the X-axis and the Y-axis are directional axes parallel to the horizontal plane.
- the horizontal direction refers to the XY direction unless otherwise specified.
- the Z-axis is a directional axis parallel to the direction of gravity.
- a wire electric discharge machine 10 is an industrial machine that performs electric discharge machining on a workpiece W by generating electric discharge in a gap g (see FIG. 2) formed between a wire electrode 12 and the workpiece W. be.
- the wire electric discharge machine 10 includes a machine main body 14 and a control device 16 .
- the machine main body 14 performs electrical discharge machining.
- the control device 16 controls the processing machine main body 14 .
- the processing machine main body 14 includes a processing tank 18 , a table (moving pedestal) 20 , a feed mechanism 22 and a collection box 24 .
- the machining tank 18 is a tank that stores the machining liquid Lq.
- the working liquid Lq is a dielectric liquid.
- the working liquid Lq is deionized water.
- the table 20 is a pedestal that supports the workpiece W.
- the table 20 is installed inside the processing tank 18 .
- the table 20 is horizontally movable. Note that the movable table 20 is realized based on known technology.
- FIG. 2 is a configuration diagram of the feed mechanism 22 according to the embodiment.
- the feeding mechanism 22 is a mechanism for feeding the wire electrode 12 along a predetermined feeding route.
- the feeding path of the wire electrode 12 follows the wire bobbin 30, the feed roller 32, the upper wire guide 38A, the workpiece W, the lower wire guide 38B, and the winding roller 48 in this order.
- a detailed description of the wire bobbin 30, the feed roller 32, the upper wire guide 38A, the workpiece W, the lower wire guide 38B, and the winding roller 48 will be given later.
- the feed mechanism 22 has a supply system 26 and a recovery system 28 .
- the supply system 26 supplies the wire electrode 12 to the object W to be processed.
- the recovery system 28 recovers the wire electrode 12 that has passed through the object W to be processed.
- illustration of the table 20 that supports the workpiece W is omitted.
- the wire electrode 12 and the workpiece W in FIG. 2 are drawn side by side. Generally, however, the wire electrode 12 is passed through a hole through the workpiece W (see FIG. 1).
- the supply system 26 includes a wire bobbin 30, a feed roller 32, two auxiliary rollers 34A, an upper pipe die 36A and an upper wire guide 38A.
- Wire bobbin 30 is a rotatable bobbin.
- the wire electrode 12 is wound around the wire bobbin 30 so that it can be pulled out.
- Each of the feed roller 32 and the two auxiliary rollers 34A is a rotatable roller.
- the wire electrode 12 pulled out from the wire bobbin 30 is stretched over the feed roller 32 .
- Two auxiliary rollers 34A are installed between the wire bobbin 30 and the feed roller 32. As shown in FIG. The two auxiliary rollers 34A restrain the wire electrode 12 from bending.
- the upper pipe die 36A is a cylindrical member installed downstream from the feed roller 32.
- Upper pipe die 36A guides wire electrode 12 toward upper wire guide 38A.
- the upper wire guide 38A is a wire guide that guides the wire electrode 12 from the feed roller 32 toward the workpiece W.
- the upper wire guide 38A is horizontally movable.
- An upper electrode pin 40A is provided in the upper wire guide 38A (inside the upper wire guide 38A).
- the upper electrode pin 40A is connected to a power source (not shown). This power supply applies a voltage pulse (voltage) to the wire electrode 12 via the upper electrode pin 40A.
- auxiliary roller 34A sandwich the wire electrode 12 (see FIG. 2). This reduces the risk that the wire electrode 12 will come off the feed roller 32 .
- the number of auxiliary rollers 34A is not limited to the example (two) in FIG.
- the supply system 26 further includes a torque motor 42 and a feed motor 44 .
- the torque motor 42 is a motor that applies rotational torque to the wire bobbin 30 . This rotational torque is torque in a direction that prevents the wire electrode 12 from being delivered. Due to this rotational torque, a force (back tension) in the direction opposite to the delivery direction is applied to the wire electrode 12 .
- the feed motor 44 is, for example, a servomotor.
- a feed motor 44 is connected to the feed roller 32 .
- a feed motor 44 controls the rotation of the feed roller 32 .
- the feed motor 44 has a shaft 44a. Further, the feed motor 44 is provided with a sensor 46A. Sensor 46A is, for example, a rotary encoder. The sensor 46A outputs a detection signal SiA according to the drive of the shaft 44a. The detection signal SiA is input to the controller 16 (see FIG. 1).
- the collection system 28 includes a lower wire guide 38B, an auxiliary roller 34B, a lower pipe die 36B, a winding roller 48, and a pinch roller 50.
- the lower wire guide 38B is a wire guide that guides the wire electrode 12 that has passed through the workpiece W toward the winding roller 48 .
- the lower wire guide 38B is horizontally movable.
- a lower electrode pin 40B is provided on the lower wire guide 38B.
- the lower electrode pin 40B is connected to a power supply (not shown). This power supply applies a voltage to the wire electrode 12 via the lower electrode pin 40B. Note that the lower electrode pin 40B and the upper electrode pin 40A may be connected to the same power supply.
- the auxiliary roller 34B is a rotatable roller.
- the auxiliary roller 34B is installed between the lower wire guide 38B and the take-up roller 48. As shown in FIG. The auxiliary roller 34B prevents the wire electrode 12 from bending.
- the number of auxiliary rollers 34B is not particularly limited.
- the lower pipe die 36B is a cylindrical member installed downstream from the lower wire guide 38B. The lower pipe die 36B guides the wire electrode 12 to the winding roller 48. As shown in FIG.
- Each of take-up roller 48 and pinch roller 50 is a rotatable roller.
- the wire electrode 12 that has passed through the lower wire guide 38B is stretched over the winding roller 48 .
- the pinch roller 50 pinches the wire electrode 12 together with the winding roller 48 . This reduces the possibility that the wire electrode 12 is bent.
- the collection system 28 further includes a winding motor 52 .
- the winding motor 52 is, for example, a servomotor.
- a winding motor 52 is connected to the winding roller 48 .
- a winding motor 52 controls the rotation of the winding roller 48 .
- the winding motor 52 has a shaft 52a. Further, the winding motor 52 is provided with a sensor 46B. Sensor 46B is, for example, a rotary encoder. The sensor 46B outputs a detection signal SiB according to the drive of the shaft 52a. The detection signal SiB is input to the controller 16 (see FIG. 1).
- the control device 16 has a motor driving device 54, a motor commanding device 56, and a disconnection position estimating device 58 (see FIG. 1).
- a motor drive device 54 drives the torque motor 42 , the feed motor 44 and the take-up motor 52 .
- the motor command device 56 outputs a command signal SiO toward the motor drive device 54 .
- the motor driving device 54, the motor commanding device 56, and the disconnection position estimating device 58 will be described below. However, for the motor driving device 54 and the motor commanding device 56, known techniques related to motor control may be used. Accordingly, the description of motor drive 54 and motor commander 56 is limited to brief descriptions in the following.
- Motor command unit 56 includes a processor and memory. Neither the processor nor the memory of the motor command device 56 are shown.
- a predetermined program is input to the memory of the motor command device 56 .
- the processor of motor command unit 56 executes a predetermined program.
- the motor command device 56 outputs the command signal SiO .
- the command signal SiO is a signal for designating the rotational speeds of the torque motor 42 , the feed motor 44 and the take-up motor 52 .
- a motor command device 56 specifies a command signal SiO for specifying the rotation speed of the torque motor 42, a command signal SiO for specifying the rotation speed of the feed motor 44, and a rotation speed of the winding motor 52. It is possible to output a command signal SiO for .
- the motor driving device 54 appropriately includes a motor amplifier (motor driver).
- the motor drive device 54 supplies drive currents to the torque motor 42, the feed motor 44, and the take-up motor 52 based on the input command signal SiO .
- the torque motor 42, the feed motor 44, and the take-up motor 52 are driven according to the supplied drive current.
- the motor driving device 54 acquires the detection signal SiA and the detection signal SiB .
- the motor driving device 54 performs feedback control based on the detection signal SiA and the detection signal SiB .
- the rotation speed of the feed motor 44 specified by the command signal SiO may differ from the actual rotation speed of the feed motor 44 .
- the motor drive device 54 adjusts the drive current supplied to the feed motor 44 based on the detection signal SiA .
- the actual rotation speed of the feed motor 44 approaches the rotation speed designated by the command signal SiO .
- the rotation speed of the winding motor 52 specified by the command signal SiO may differ from the actual rotation speed of the winding motor 52 .
- the motor drive device 54 adjusts the drive current supplied to the winding motor 52 based on the detection signal SiB .
- the actual rotational speed of the winding motor 52 approaches the rotational speed designated by the command signal SiO .
- the motor command device 56 and the motor drive device 54 described above drive the feed motor 44 and the winding motor 52 to feed the wire electrode 12 from the wire bobbin 30 to the collection box 24 . Further, the motor command device 56 and the motor drive device 54 described above apply back tension to the wire electrode 12 by controlling the torque motor 42 . Motor command device 56 and motor drive device 54 appropriately control feed motor 44 , take-up motor 52 , and torque motor 42 to move wire electrode 12 between feed roller 32 and take-up roller 48 . be stretched.
- a gap g is formed between the stretched wire electrode 12 and the workpiece W (see FIG. 2).
- the wire electric discharge machine 10 applies a voltage to the wire electrode 12 via the upper electrode pin 40A and the lower electrode pin 40B to generate electric discharge in the gap g. Further, the wire electric discharge machine 10 relatively moves the wire electrode 12 and the workpiece W while generating electric discharge in the gap g. Thereby, the workpiece W is processed into the shape of the workpiece.
- controller 16 performs movement control of table 20, upper wire guide 38A, lower wire guide 38B, and voltage applied to wire electrode 12.
- FIG. 3 is a configuration diagram of the disconnection position estimation device 58 according to the embodiment.
- the disconnection position estimation device 58 includes a display unit 60, an operation unit 62, a storage unit 64, and a calculation unit 66 (see FIG. 3).
- the display unit 60 is a display that displays information to the operator.
- the display unit 60 includes, for example, a display screen.
- the display unit 60 may display not only information about the disconnection position estimation device 58 but also information about the motor command device 56, for example.
- the display screen of the display unit 60 has, for example, a liquid crystal panel.
- the material of the display screen of the display unit 60 is not limited to liquid crystal.
- the material of the display screen of the display unit 60 may include organic EL (OEL: Organic Electro-Luminescence).
- the operation unit 62 is provided for the operator to give instructions to the disconnection position estimation device 58 .
- the operation unit 62 includes, for example, a keyboard (a plurality of operation keys), a mouse, and a touch panel.
- the touch panel is installed, for example, on the display unit 60 . Note that the operation unit 62 may receive not only the operator's instruction regarding the disconnection position estimation device 58 but also the operator's instruction regarding the motor command device 56 .
- the storage unit 64 includes memory.
- the storage unit 64 includes RAM (Random Access Memory) and ROM (Read Only Memory).
- RAM Random Access Memory
- ROM Read Only Memory
- the memory of storage unit 64 and the memory (not shown) of motor command device 56 may overlap.
- the storage unit 64 stores a disconnection position estimation program 68 .
- the wire breakage position estimation program 68 is a program for causing the wire breakage position estimation device 58 to execute a wire breakage position estimation method for reliably estimating the wire breakage position P BR (see FIG. 4A) of the wire electrode 12 .
- the computing unit 66 includes a processor.
- the calculation unit 66 includes a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit).
- the processor of arithmetic unit 66 and the processor (not shown) of motor command device 56 may overlap.
- the calculation unit 66 has a torque acquisition unit 70 , a determination unit 72 , a rotation angle acquisition unit 74 , a wire breakage position estimation unit 76 and a display control unit 78 .
- the torque acquisition unit 70 , the determination unit 72 , the rotation angle acquisition unit 74 , the wire breakage position estimation unit 76 , and the display control unit 78 are implemented by the calculation unit 66 executing the wire breakage position estimation program 68 .
- the torque acquisition unit 70 acquires the rotational torque Tq of the shaft 52a of the winding motor 52 (hereinafter simply torque Tq).
- the torque Tq is calculated by the motor drive device 54 or the motor command device 56, for example, based on the detection signal SiB of the sensor 46B.
- torque acquisition unit 70 acquires torque Tq from motor drive device 54 or motor command device 56 .
- the torque acquisition unit 70 may calculate the torque Tq based on the detection signal SiB .
- the torque acquisition section 70 acquires the detection signal SiB .
- the detection signal SiB is obtained from the motor driving device 54, for example.
- the torque acquisition unit 70 inputs the acquired torque Tq to the determination unit 72 .
- the determination unit 72 determines whether or not the rear end 12a (FIG. 4A) of the wire electrode 12 has passed the winding roller 48 based on the torque Tq. In relation to this determination, the relationship between the breakage of the wire electrode 12 and the torque Tq will be described below.
- FIG. 4A is a diagram illustrating the feeding mechanism 22 when the wire electrode 12 is broken.
- the motor driving device 54 supplies the winding motor 52 with a driving current larger than that when the frictional force F does not act on the wire electrode 12 .
- the motor driving device 54 supplies a larger drive current to the winding motor 52 than when the frictional force F does not act, in order to maintain the rotation speed and the torque Tq of the winding motor 52 within a predetermined range.
- the frictional force F is generated even after the wire electrode 12 is broken while the wire electrode 12 is being wound by the winding roller 48 (see FIG. 4A).
- FIG. 4B is a diagram illustrating the feed mechanism 22 after the time has elapsed since FIG. 4A and the broken wire electrode 12 has passed through the winding roller 48 and the pinch roller 50 .
- the frictional force F disappears when the rear end 12a of the wire electrode 12 passes through the winding roller 48 (see FIG. 4B). This reduces the load on the take-up roller 48 . After that, the driving current of the winding motor 52 required to rotate the winding roller 48 at the specified rotation speed decreases according to the amount of load reduction. Therefore, the motor drive device 54 reduces the drive current supplied to the winding motor 52 .
- the motor drive device 54 reduces the drive current supplied to the winding motor 52 .
- FIG. 5 is a graph (vertical axis: torque Tq, horizontal axis: time) simply illustrating changes in the torque Tq of the winding motor 52 before and after the trailing end 12a of the wire electrode 12 passes the winding roller 48.
- FIG. . Time t (hereafter, wire passing time) in FIG. 5 indicates the time when the trailing end 12a of the wire electrode 12 passes the winding roller 48 (between the winding roller 48 and the pinch roller 50).
- the graph in FIG. 5 simply illustrates changes in the torque Tq between FIGS. 4A and 4B.
- the torque Tq rises sharply from the wire passage time t. This is because a large drive current including the frictional force F is supplied to the winding roller 48 on which the frictional force F does not act.
- the determination unit 72 determines whether the trailing end 12a of the wire electrode 12 wound around the winding roller 48 has passed the winding roller 48 based on the rate of change per unit time of the torque Tq. Determine whether or not For example, the determination unit 72 determines that the trailing end 12a has passed the take-up roller 48 when the rate of change exceeds a predetermined threshold value after the disconnection occurs. Note that the threshold is determined in advance, for example, based on experiments.
- the winding of the wire electrode 12 by the winding roller 48 means sending the wire electrode 12 toward the collection box 24 in accordance with the rotation of the winding roller 48 . It is not necessary to run the wire electrode 12 in reverse.
- a motor drive device 54 and a motor command device 56 control the winding motor 52 during winding.
- the determination unit 72 acquires the disconnection timing of the wire electrode 12 .
- the disconnection timing of the wire electrode 12 is obtained by using a known technique for disconnection detection.
- disconnection detection means tension sensor
- Japanese Patent Application Laid-Open No. 2019-217559 is used.
- the rotation angle acquisition unit 74 acquires the rotation angle A RO of the winding motor 52 .
- the rotation angle A RO can be calculated based on the detection signal SiB .
- the motor drive device 54 or the motor command device 56 may calculate the rotation angle ARO based on the detection signal SiB .
- the rotation angle acquisition unit 74 in FIG. 3 acquires the rotation angle A RO from the motor drive device 54 or the motor command device 56 .
- the rotation angle acquisition unit 74 particularly acquires the rotation angle (rotation amount) A RO from when the wire electrode 12 is disconnected until it is determined that the trailing end 12 a has passed the take-up roller 48 .
- the rotation angle A RO from when the wire electrode 12 is broken until it is determined that the trailing end 12 a has passed the winding roller 48 is input to the wire breakage position estimator 76 .
- the disconnection position estimator 76 calculates the wire length LW of the wire electrode 12 that has passed through the winding roller 48 from when the wire electrode 12 was disconnected until the trailing end 12a passes the winding roller 48 .
- the wire length LW can be calculated based on the rotation angle A RO input from the rotation angle acquisition unit 74 and the diameter of the take-up roller 48 .
- the take-up roller 48 is known information.
- the diameter of the take-up roller 48 may be the radius of the take-up roller 48 .
- the wire breakage position estimator 76 estimates the wire breakage position PBR of the wire electrode 12 in the transmission path based on the wire length LW .
- the wire breakage position estimator 76 estimates a wire breakage position PBR at a position that is upstream of the take-up roller 48 by the length of the wire length LW in the delivery path of the wire electrode 12 (FIG. 4A). reference).
- the disconnection position estimation unit 76 outputs the estimation result (disconnection position P BR ) to the display control unit 78 .
- the display control section 78 controls the display section 60 .
- the display control unit 78 causes the display unit 60 to display the estimation result input from the wire breakage position estimation unit 76 . Thereby, the operator grasps the estimated disconnection position P BR through the display unit 60 .
- the display control unit 78 displays a message indicating, for example, the disconnection position PBR .
- the display control unit 78 may use a drawing showing the configuration of the feeding mechanism 22, for example, and display a predetermined icon at a location corresponding to the disconnection position PBR in the drawing.
- the disconnection position estimating device 58 of the present embodiment estimates the disconnection position PBR of the wire electrode 12 based on the driving information of the winding motor 52 obtained from the sensor 46B. Therefore, the wire breakage position estimating device 58 can estimate the wire breakage position P BR for the entire range upstream of the take-up roller 48 in the delivery path. Further, the disconnection position estimation device 58 detects the position of the rear end 12a of the wire electrode 12 based on the detection signal SiB . Accordingly, it is unnecessary in the present embodiment to separately provide a tip detection electrode and to run the wire electrode 12 in the reverse direction after disconnection. Since there is no need to run the wire electrode 12 in the reverse direction, there is no possibility that the wire electrode 12 will get tangled by the wire electrode 12 running in the reverse direction.
- FIG. 6 is a flowchart illustrating the flow of the disconnection position estimation method according to the embodiment.
- the disconnection position estimation method is explained below.
- the wire breakage position estimation method is executed by the wire breakage position estimation device 58 .
- the wire breakage position estimation method includes a rotation angle acquisition step S1, a torque acquisition step S2, a determination step S3, a wire breakage position estimation step S4, and a display step S5 (see FIG. 6).
- the disconnection position estimation method is automatically started (START) when, for example, disconnection of the wire electrode 12 occurs.
- the rotation angle acquisition unit 74 acquires the rotation angle A RO of the winding motor 52 based on the detection signal SiB of the sensor 46B. At this point, the winding motor 52 continues to rotate to deliver the wire electrode 12 toward the collection box 24 . Note that the feed motor 44 may be stopped.
- the torque acquisition section 70 acquires the torque Tq of the winding motor 52 based on the detection signal SiB of the sensor 46B.
- the determination unit 72 determines whether or not the rear end 12a of the wire electrode 12 wound by the winding roller 48 has passed the winding roller 48 based on the torque Tq.
- the wire breakage position estimation unit 76 estimates the wire breakage position PBR of the wire electrode 12 .
- the display control unit 78 causes the display unit 60 to display the wire breakage position PBR based on the result of the wire breakage position PBR estimation performed in the wire breakage position estimation step S4.
- the above is the description of the disconnection position estimation method of the present embodiment.
- FIG. 7 is a configuration diagram of a wire breakage position estimation device 58A (58) according to Modification 1. As shown in FIG.
- the disconnection position estimating device 58A further has a table 80 and a cause measure identifying unit 82.
- the table 80 is a correspondence table in which the disconnection position PBR of the wire electrode 12, the cause of the disconnection, and the coping method are associated with each other.
- the table 80 is pre-stored in the storage unit 64 .
- FIG. 8 is a diagram illustrating a plurality of sections defined on the delivery path of the wire electrode 12.
- FIG. 8 illustrates six sections [1] to [6] dividing the delivery route.
- Section [1] is a section from the feed roller 32 to the upper wire guide 38A.
- Section [2] is a section including the upper wire guide 38A.
- Section [3] is a section including the upper surface or the lower surface of the workpiece W.
- FIG. Section [4] is a section including a portion (central portion) of the workpiece W excluding the upper and lower surfaces.
- Section [5] is a section including the lower wire guide 38B.
- Section [6] is a section including the downstream side of the lower wire guide 38B. Note that the above divisions are examples for explanation. Therefore, the method of dividing the delivery route and the number of sections are not limited to those illustrated in FIG.
- FIG. 9 is a diagram exemplifying a table 80 that defines correspondence relationships between a plurality of sections in FIG. 8, causes of disconnection that can occur in each section, and coping methods.
- Candidates for the cause of disconnection of the wire electrode 12 are narrowed down based on the disconnection position PBR .
- candidates for the cause of wire breakage occurring in section [1] include wear of the upper wire guide 38A (upper electrode pin 40A), poor cleaning of the upper pipe die 36A, and an abnormality near the feed roller 32.
- the upper wire guide 38A (upper electrode pin 40A) is inspected, the upper wire guide 38A is replaced, the upper pipe die 36A is cleaned, and the feed roller 32, and replacement of the feed roller 32.
- table 80 of FIG. 9 a plurality of sections [1] to [6] are defined in the leftmost column.
- the cause of disconnection corresponding to each section is defined in the middle column.
- the coping method corresponding to each section is specified in the rightmost column.
- the table 80 in FIG. 9 is an example. Therefore, the specific contents of table 80 are not limited to the illustration in FIG.
- the cause and remedy identification unit 82 can be virtually realized by the calculation unit 66 executing a predetermined program, for example, similar to the torque acquisition unit 70 .
- the cause remedy identifying unit 82 determines to which of the sections [1] to [6] the disconnection position PBR estimated by the disconnection position estimation unit 76 belongs. Further, the cause/measure identifying unit 82 identifies the disconnection cause and the remedy corresponding to the disconnection position PBR based on the determination result. Here, the cause/measure identifying unit 82 refers to the table 80 as necessary.
- the display control unit 78 of this modification causes the display unit 60 to display not only the disconnection position P BR but also the cause and the remedy identified by the cause and remedy identifying unit 82 . As a result, the operator can efficiently cope with disconnection of the wire electrode 12 .
- FIG. 10 is a flowchart illustrating the flow of the disconnection position estimation method according to Modification 1.
- the wire breakage position estimation device 58A can implement the wire breakage position estimation method of FIG.
- the disconnection position estimation method of FIG. 10 includes a rotation angle acquisition step S1, a torque acquisition step S2, a determination step S3, a disconnection position estimation step S4, a cause measure identification step S6, and a display step S7.
- the cause and measure identification step S6 is executed after the disconnection position estimation step S4.
- the cause and remedy identifying unit 82 identifies, based on the table 80, the cause of wire breakage and the remedy corresponding to the wire breakage position PBR estimated in the wire breakage position estimation step S4.
- the cause/measure identifying unit 82 may identify only one of the disconnection cause and the remedy.
- the display step S7 is executed after the causal measure identification step S6.
- the display control unit 78 causes the display unit 60 to display the disconnection position PBR , the cause of the disconnection, and the coping method. As described above, the disconnection position estimation method of the present modification is completed (RETURN).
- the table 80 may include only one of the disconnection cause and the coping method corresponding to the disconnection position PBR .
- the cause/measure identifying unit 82 identifies the cause of disconnection or the remedy.
- the determination unit 72 determines whether or not the trailing end 12a of the wire electrode 12 has passed the winding roller 48 based on whether or not the acquired torque Tq has deviated from a predetermined range for the torque Tq. You may
- the torque acquisition unit 70 may substantially acquire the torque Tq by acquiring a physical quantity that changes according to the torque Tq.
- the physical quantity that changes according to the torque Tq is not particularly limited as long as it changes according to the torque Tq.
- the disconnection position estimation device 58 may be an electronic device separate from the control device 16 (motor command device 56, motor drive device 54). In this case, the disconnection position estimation device 58 acquires the torque Tq or the rotation angle A RO from the control device 16, for example, via a network (whether wired or wireless).
- a first invention is a wire breakage position estimating device (58) for estimating a wire breakage position (P BR ) of a wire electrode (12) in a wire electric discharge machine (10), wherein the wire electric discharge machine is an object to be machined.
- W a winding roller (48) for winding the wire electrode that has passed through the workpiece; a winding motor (52) for driving the winding roller; a sensor (46B) that outputs a detection signal (Si B ) according to the driving of the shaft (52a), and the disconnection position estimating device estimates the torque (Tq) of the winding motor based on the detection signal.
- a torque acquisition part (70) for acquiring, and whether or not the rear end (12a) of the wire electrode wound by the winding roller based on the torque has passed the winding roller when the wire electrode is broken; a determination unit (72) for determining whether or not; a rotation angle acquisition unit (74) for acquiring the rotation angle (A RO ) of the winding motor based on the detection signal; a disconnection position estimating section (76) for estimating the disconnection position of the wire electrode based on the rotation angle of the winding motor until it is determined that the trailing end of the wire electrode has passed the winding roller.
- a disconnection position estimating device that reliably estimates the disconnection position of the wire electrode while omitting the tip detection electrode.
- the determination unit may determine whether or not the trailing end of the wire electrode has passed the winding roller based on the rate of change of the torque per unit time. As a result, the rear end can be detected without depending on the front end detection electrode and without the need for reverse running of the wire electrode.
- the determination unit determines whether or not the trailing end of the wire electrode has passed the winding roller based on whether or not the acquired torque deviates from a predetermined range for the torque. may As a result, the rear end can be detected without depending on the front end detection electrode and without the need for reverse running of the wire electrode.
- the disconnection position estimation device may be provided in a control device (16) that controls the wire electric discharge machine.
- a wire breakage position estimation method for estimating a wire breakage position (P BR ) of a wire electrode (12) in a wire electric discharge machine (10), wherein the wire electric discharge machine is sent toward a workpiece (W).
- a sensor (46B) that outputs a detection signal (Si B ), and the disconnection position estimation method acquires the rotation angle (A RO ) of the winding motor based on the detection signal (Si B ) of the sensor.
- a torque acquisition step (S1) for acquiring the torque (Tq) of the winding motor based on the detection signal of the sensor; and a step (S2) for acquiring the torque (Tq) of the winding motor based on the detection signal of the sensor; a determination step (S3) for determining whether or not the rear end (12a) of the wire electrode wound by the winding roller has passed the winding roller based on the above; and a disconnection position estimation step (S4) of estimating the disconnection position of the wire electrode based on the rotation angle of the winding motor until it is determined that the trailing end of the electrode has passed the winding roller.
- This provides a disconnection position estimation method that reliably estimates the disconnection position of the wire electrode while omitting the tip detection electrode.
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Abstract
Description
図1は、実施の形態に係るワイヤ放電加工機10の構成図である。
以上、本発明の一例として実施の形態が説明された。上記実施の形態には、多様な変更または改良を加えることが可能である。また、その様な変更または改良を加えた形態が本発明の技術的範囲に含まれ得ることは、請求の範囲の記載から明らかである。
図7は、変形例1に係る断線位置推定装置58A(58)の構成図である。
判定部72は、取得されたトルクTqが、トルクTqに関して予め決められた範囲を逸脱したか否かに基づいて、ワイヤ電極12の後端12aが巻取りローラ48を通過したか否かを判定してもよい。
トルク取得部70は、トルクTqに応じて変化する物理量を取得することで、実質的にトルクTqを取得してもよい。トルクTqに応じて変化する物理量とは、トルクTqに応じて変化する限りにおいて特に限定されないが、例えば巻取りモータ52の駆動電流、または巻取りモータ52の回転速度である。
断線位置推定装置58は、制御装置16(モータ指令装置56、モータ駆動装置54)とは別個の電子装置でもよい。この場合、断線位置推定装置58は、例えばネットワーク(有線/無線を問わない)を介して、制御装置16からトルクTqまたは回転角度AROを取得する。
前述の各変形例は、矛盾しない範囲内であれば、適宜組み合わされてよい。
上記実施の形態および変形例から把握しうる発明について、以下に記載する。
第1の発明は、ワイヤ放電加工機(10)におけるワイヤ電極(12)の断線位置(PBR)を推定する断線位置推定装置(58)であって、前記ワイヤ放電加工機は、加工対象物(W)に向けて送出されて前記加工対象物を通過した前記ワイヤ電極を巻き取る巻取りローラ(48)と、前記巻取りローラを駆動する巻取りモータ(52)と、前記巻取りモータのシャフト(52a)の駆動に応じた検出信号(SiB)を出力するセンサ(46B)と、を備え、前記断線位置推定装置は、前記検出信号に基づいて前記巻取りモータのトルク(Tq)を取得するトルク取得部(70)と、前記ワイヤ電極が断線した場合に、前記トルクに基づいて前記巻取りローラによって巻き取られる前記ワイヤ電極の後端(12a)が前記巻取りローラを通過したか否かを判定する判定部(72)と、前記検出信号に基づいて前記巻取りモータの回転角度(ARO)を取得する回転角度取得部(74)と、前記ワイヤ電極が断線してから前記ワイヤ電極の後端が前記巻取りローラを通過したと判定されるまでの前記巻取りモータの回転角度に基づいて、前記ワイヤ電極の断線位置を推定する断線位置推定部(76)と、を備える。
ワイヤ放電加工機(10)におけるワイヤ電極(12)の断線位置(PBR)を推定する断線位置推定方法であって、前記ワイヤ放電加工機は、加工対象物(W)に向けて送出されて前記加工対象物を通過した前記ワイヤ電極を巻き取る巻取りローラ(48)と、前記巻取りローラを駆動する巻取りモータ(52)と、前記巻取りモータのシャフト(52a)の駆動に応じた検出信号(SiB)を出力するセンサ(46B)と、を備え、前記断線位置推定方法は、前記センサの検出信号(SiB)に基づいて前記巻取りモータの回転角度(ARO)を取得する回転角度取得ステップ(S1)と、前記センサの検出信号に基づいて前記巻取りモータのトルク(Tq)を取得するトルク取得ステップ(S2)と、前記ワイヤ電極が断線した場合に、前記トルクに基づいて前記巻取りローラによって巻き取られる前記ワイヤ電極の後端(12a)が前記巻取りローラを通過したか否かを判定する判定ステップ(S3)と、前記ワイヤ電極が断線してから前記ワイヤ電極の後端が前記巻取りローラを通過したと判定されるまでの前記巻取りモータの回転角度に基づいて、前記ワイヤ電極の断線位置を推定する断線位置推定ステップ(S4)と、を含む。
Claims (6)
- ワイヤ放電加工機(10)におけるワイヤ電極(12)の断線位置(PBR)を推定する断線位置推定装置(58)であって、
前記ワイヤ放電加工機は、
加工対象物(W)に向けて送出されて前記加工対象物を通過した前記ワイヤ電極を巻き取る巻取りローラ(48)と、
前記巻取りローラを駆動する巻取りモータ(52)と、
前記巻取りモータのシャフト(52a)の駆動に応じた検出信号(SiB)を出力するセンサ(46B)と、
を備え、
前記断線位置推定装置は、
前記検出信号に基づいて前記巻取りモータのトルク(Tq)を取得するトルク取得部(70)と、
前記ワイヤ電極が断線した場合に、前記トルクに基づいて前記巻取りローラによって巻き取られる前記ワイヤ電極の後端(12a)が前記巻取りローラを通過したか否かを判定する判定部(72)と、
前記検出信号に基づいて前記巻取りモータの回転角度(ARO)を取得する回転角度取得部(74)と、
前記ワイヤ電極が断線してから前記ワイヤ電極の後端が前記巻取りローラを通過したと判定されるまでの前記巻取りモータの回転角度に基づいて、前記ワイヤ電極の断線位置を推定する断線位置推定部(76)と、
を備える、断線位置推定装置。 - 請求項1に記載の断線位置推定装置であって、
前記判定部は、前記トルクの単位時間あたりの変化率に基づいて、前記ワイヤ電極の後端が前記巻取りローラを通過したか否かを判定する、断線位置推定装置。 - 請求項1に記載の断線位置推定装置であって、
前記判定部は、取得された前記トルクが、前記トルクに関して予め決められた範囲を逸脱したか否かに基づいて、前記ワイヤ電極の後端が前記巻取りローラを通過したか否かを判定する、断線位置推定装置。 - 請求項1~3のいずれか1項に記載の断線位置推定装置であって、
前記ワイヤ電極の断線位置と、断線原因および対処方法のうち少なくとも一方とを対応付けたテーブル(80)と、
前記断線位置推定部が推定した断線位置に対応する断線原因および対処方法のうち少なくとも一方を前記テーブルに基づいて特定する原因対処特定部(82)と、
特定された前記断線原因および前記対処方法のうち少なくとも一方を表示部(60)に表示させる表示制御部(78)と、
をさらに備える、断線位置推定装置。 - 請求項1~4のいずれか1項に記載の断線位置推定装置であって、
前記ワイヤ放電加工機を制御する制御装置(16)に設けられている、断線位置推定装置。 - ワイヤ放電加工機(10)におけるワイヤ電極(12)の断線位置(PBR)を推定する断線位置推定方法であって、
前記ワイヤ放電加工機は、
加工対象物(W)に向けて送出されて前記加工対象物を通過した前記ワイヤ電極を巻き取る巻取りローラ(48)と、
前記巻取りローラを駆動する巻取りモータ(52)と、
前記巻取りモータのシャフト(52a)の駆動に応じた検出信号(SiB)を出力するセンサ(46B)と、
を備え、
前記断線位置推定方法は、
前記センサの検出信号に基づいて前記巻取りモータの回転角度(ARO)を取得する回転角度取得ステップ(S1)と、
前記センサの検出信号に基づいて前記巻取りモータのトルク(Tq)を取得するトルク取得ステップ(S2)と、
前記ワイヤ電極が断線した場合に、前記トルクに基づいて前記巻取りローラによって巻き取られる前記ワイヤ電極の後端(12a)が前記巻取りローラを通過したか否かを判定する判定ステップ(S3)と、
前記ワイヤ電極が断線してから前記ワイヤ電極の後端が前記巻取りローラを通過したと判定されるまでの前記巻取りモータの回転角度に基づいて、前記ワイヤ電極の断線位置を推定する断線位置推定ステップ(S4)と、
を含む、断線位置推定方法。
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JP2023502287A JP7492077B2 (ja) | 2021-02-26 | 2022-02-14 | 断線位置推定装置および断線位置推定方法 |
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JPH0645296Y2 (ja) * | 1987-11-06 | 1994-11-24 | 日立精工株式会社 | ワイヤ放電加工機 |
JP2573514B2 (ja) * | 1988-05-11 | 1997-01-22 | ファナック株式会社 | ワイヤ断線位置検出装置 |
JP2705460B2 (ja) * | 1992-06-04 | 1998-01-28 | 三菱電機株式会社 | ワイヤ放電加工装置 |
JP2987305B2 (ja) * | 1995-02-17 | 1999-12-06 | ファナック株式会社 | ワイヤ放電加工機における断線ワイヤの処理方法 |
JP2000172340A (ja) * | 1998-12-03 | 2000-06-23 | Honda Motor Co Ltd | モータ制御の位置補償装置 |
WO2012157068A1 (ja) * | 2011-05-16 | 2012-11-22 | 三菱電機株式会社 | ワイヤ放電加工装置 |
JP6824916B2 (ja) * | 2018-01-31 | 2021-02-03 | 株式会社ソディック | ワイヤ放電加工装置 |
JP2019217559A (ja) | 2018-06-15 | 2019-12-26 | ファナック株式会社 | ワイヤ放電加工機および加工条件調整方法 |
JP6760997B2 (ja) * | 2018-06-15 | 2020-09-23 | ファナック株式会社 | ワイヤ放電加工機および加工条件調整方法 |
WO2021153430A1 (ja) * | 2020-01-28 | 2021-08-05 | ファナック株式会社 | ワイヤ放電加工機の制御装置および推定方法 |
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JPWO2022181368A1 (ja) | 2022-09-01 |
US20240051050A1 (en) | 2024-02-15 |
KR20230152666A (ko) | 2023-11-03 |
CN116867594A (zh) | 2023-10-10 |
EP4299226A1 (en) | 2024-01-03 |
TW202233333A (zh) | 2022-09-01 |
JP7492077B2 (ja) | 2024-05-28 |
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