CN113453832A - Automatic wire connecting device of wire discharge machining device - Google Patents
Automatic wire connecting device of wire discharge machining device Download PDFInfo
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- CN113453832A CN113453832A CN201980092644.9A CN201980092644A CN113453832A CN 113453832 A CN113453832 A CN 113453832A CN 201980092644 A CN201980092644 A CN 201980092644A CN 113453832 A CN113453832 A CN 113453832A
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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
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Abstract
An automatic wire connecting device (1000) of a wire electric discharge machining device comprises: a wire collection unit (500) that inserts and sandwiches the wire electrode (20) that has passed through a region where the workpiece (21) is to be electric-discharge-machined between a pair of wire collection rollers (501) and discharges the wire electrode; a drive unit (400) that opens and closes the pair of thread collection rollers (501); a wire feed motor (4) for driving the wire feed roller (3); a suction unit (100) that sucks and discharges the wire electrode together with the fluid from the wire discharge side of the wire collection unit (500); and a control unit (300) that, at the start of automatic wire connection, performs control so that, after the separation movement that separates the pair of wire collection rollers (501), the wire electrode (20) is sucked by the suction operation of the suction unit (100), and the delivery of the wire electrode (20) is started, and that, when the tip of the wire electrode (20) reaches the suction unit (100), performs control so that the closing movement that closes the pair of wire collection rollers (501) is performed.
Description
Technical Field
The present invention relates to a wire electric discharge machining apparatus that cuts or removes a workpiece by repeatedly generating electric discharge between a wire electrode and the workpiece, and more particularly, to an automatic wire connecting apparatus that automatically loads a wire electrode from a wire supply roller to a wire recovery roller.
Background
Generally, a wire electric discharge machine includes: a wire feeding unit that draws out the wire electrode from a wire bobbin around which the wire electrode is wound, and feeds out the wire electrode by a wire feeding roller; a wire guide unit including a power feeding unit for supplying electric energy to the wire electrode, a guide unit for holding the wire electrode, and the like; and a wire collecting unit that sandwiches the wire electrode that has passed through the region in which the electric discharge machining is performed on the workpiece and has been completed between a pair of wire collecting rollers, winds the wire electrode around the wire collecting roller, and discharges the wire electrode to the outside of the wire electric discharge machining apparatus. In the present invention, a member or device having a function of supplying a wire electrode or a guide wire electrode from a wire supplying unit to a wire collecting unit is defined as an automatic wire connecting device. When a wire electrode is newly loaded or broken, the wire electrode is automatically loaded in the wire discharge machining apparatus using the automatic wire connection device. I.e. automatic wiring is performed.
In wire electric discharge machining apparatuses, wire electrodes having a diameter of 0.03mm to 0.3mm are often used. However, an extremely thin wire electrode having a diameter of less than 0.1mm used for fine machining in particular has low rigidity and is easily bent if no tension is applied to the wire electrode. Therefore, when the wire electrode is sandwiched between the pair of wire collecting rollers and collected, the wire electrode discharged from the wire collecting unit is wound around the wire collecting rollers, and the machining may have to be stopped. In order to solve this problem, patent document 1 discloses a technique of separating a pair of wire recovery rollers from each other to feed a wire electrode between the wire recovery rollers when the wire electrode is automatically connected, and patent document 2 discloses a technique of preventing the wire electrode from being wound around the wire recovery rollers by sucking the wire electrode from a wire discharge side of a wire recovery unit.
Patent document 1: japanese patent laid-open publication No. 2006-247755
Patent document 2: WO2014/167724
Disclosure of Invention
In patent document 1, the conveying fluid is supplied from the vicinity of the lower guide roller to the thread collecting portion, and the thread electrode is guided to the thread collecting portion, but since the supply port of the conveying fluid is separated from the thread collecting portion, there is a possibility that the thread electrode cannot be guided so as to pass through the gap between the pair of thread collecting rollers satisfactorily.
Further, patent document 2 has a problem that the wire electrode can be prevented from being wound around the wire recovery rollers during recovery of the wire electrode after completion of automatic connection, but the wire electrode is separated from the conveyance fluid inside the tube near the wire recovery unit and the guidance of the conveyance fluid disappears at the time of automatic connection, and therefore, in the case of a wire electrode having low rigidity, the wire electrode is separated from the path on which the wire electrode should originally travel, the wire electrode is not sandwiched between the pair of wire recovery rollers, and automatic connection fails.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic wire connecting device that simultaneously achieves reliable automatic wire connection of a wire electrode and prevents winding of the wire electrode around a wire recovery roller during machining.
In order to solve the above problems and achieve the object, an automatic wire connecting device for a wire electric discharge machine according to the present invention includes: a wire collecting unit that inserts and sandwiches the wire electrode, which has passed through a region where electric discharge machining is performed on the workpiece, between a pair of wire collecting rollers and discharges the wire electrode; a driving part which makes the pair of thread recovery rollers perform opening and closing movement which is separating or closing movement; a wire feed motor for driving the wire feed roller in a feeding direction of the wire electrode; a suction unit that sucks and discharges the wire electrode together with the fluid from a wire discharge side of the wire collection unit; and a control unit that controls the opening and closing movement by the drive unit, controls the suction operation by the suction unit, and controls the wire electrode feeding operation by the wire supply motor. The control unit controls the wire electrode to be attracted by an attraction operation of the attraction unit and to start feeding of the wire electrode after the separation movement of separating the pair of wire recovery rollers by the opening and closing movement is performed at the start of the automatic wire connection of the wire electrode, and controls the closing movement of closing the pair of wire recovery rollers by the opening and closing movement when the leading end of the wire electrode reaches the attraction unit.
ADVANTAGEOUS EFFECTS OF INVENTION
The automatic wire connection device of the wire discharge machining device according to the present invention has the effect of being able to simultaneously achieve reliable automatic connection of a wire electrode and prevent winding of the wire electrode around a wire recovery roller during machining, and being able to reduce the setup change time accompanying when automatic connection fails or winding of the wire electrode around the wire recovery roller during machining occurs, thereby improving productivity.
Drawings
Fig. 1 is a diagram showing the configurations of a wire electric discharge machine and an automatic wire connecting device according to embodiment 1.
Fig. 2 is a diagram schematically showing the periphery of the thread collection unit according to embodiment 1.
Fig. 3 is a perspective view showing an external appearance of the suction unit according to embodiment 1.
Fig. 4 is a cross-sectional view showing a structure in a case where the suction unit according to embodiment 1 is configured by a plurality of members.
Fig. 5 is a perspective view showing a structure in a case where the suction unit according to embodiment 1 is configured by a plurality of members.
Fig. 6 is a flowchart showing operations of each unit when wire automatic connection is performed in the automatic wire connecting device according to embodiment 1.
Fig. 7 is a schematic view schematically showing a state in which a pair of wire collection rollers are closed and a wire electrode is wound in the wire collection unit according to embodiment 1.
Fig. 8 is a diagram showing an example in the case where the processing circuit included in the automatic wire connecting device according to embodiment 1 is configured by a processor and a memory.
Fig. 9 is a diagram showing the configurations of the wire electric discharge machine and the automatic wire connecting device according to embodiment 2.
Fig. 10 is a diagram schematically showing the periphery of the thread collection unit according to embodiment 2.
Fig. 11 is a diagram showing the configurations of the wire electric discharge machine and the automatic wire connecting device according to embodiment 3.
Fig. 12 is a diagram schematically showing the periphery of the thread collection unit according to embodiment 3.
Fig. 13 is a perspective view showing a configuration in which a side cover for restricting the direction of fluid flowing between a pair of thread recovery rollers is provided in the thread recovery unit according to embodiment 4.
Detailed Description
Hereinafter, an automatic wire connecting device according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.
Fig. 1 is a configuration diagram of a wire electric discharge machining apparatus according to embodiment 1 of the present invention. The automatic wire connecting device 1000 includes pulleys 2a and 2b, a wire supply roller 3, a wire supply motor 4, supply pinch rollers 5a and 5b, a wire guide upper portion 6a, a wire guide lower portion 6b, a lower roller 7, a tube 8, a recovery nozzle 9, a control portion 300, a drive portion 400, a wire recovery portion 500, a suction portion 100, a reach judgment portion 600, and a stopper 10. The wire collecting unit 500 includes a pair of wire collecting rollers 501 including a wire collecting roller 501a and a wire collecting roller 501b, a wire collecting motor 502, and a collecting roller housing 503, and collects the wire electrode 20 by inserting the wire electrode 20 between the pair of wire collecting rollers 501 and discharging the wire electrode. The driving section includes an air cylinder 401, a rod 403, and a hook 402, and the air cylinder 401 linearly operates in the opening/closing direction a to move the pair of thread recovery rollers 501 in the opening/closing direction a to open or close the opening/closing direction. The cylinder 401 may be an oil pressure cylinder, for example. The control unit 300 adjusts the amount of air supplied to the cylinder 401 and controls the driving unit 400. That is, the control unit 300 controls the opening and closing movement of the driving unit 400. The suction unit 100 is an aspirator that sucks and discharges the wire electrode 20 through a fluid from the wire discharge side of the wire collection unit 500. The arrival determination unit 600 determines whether or not the position of the distal end of the wire electrode 20 has reached the suction unit 100.
Next, a feeding operation of the wire electrode during machining will be described.
The wire electrode 20 pulled out from the wire bobbin 1 is sent out from the wire supply roller 3 via pulleys 2a and 2 b. The control unit 300 controls the wire supply motor 4 that drives the wire supply roller 3 in the feeding direction or the rewinding direction of the wire electrode 20, and controls acceleration and deceleration of the feeding operation, the rewinding operation, and the feeding speed of the wire electrode 20. That is, the control unit 300 controls acceleration and deceleration of the feeding operation, rewinding operation, and feeding speed of the wire electrode 20 related to the wire supply motor 4. The wire electrode 20 is pressed against the wire feed roller 3 by feed pinch rollers 5a and 5 b. The wire electrode 20 that is sent out is used for machining the workpiece 21 between the wire guide upper portion 6a and the wire guide lower portion 6b, and then passes through the lower roller 7, the tube 8, and the recovery nozzle 9 to reach the wire recovery rollers 501a and 501 b. The wire recovery roller 501b is driven by a wire recovery motor 502, winds the wire electrode 20 between the wire recovery roller 501a and the wire recovery roller 501b, and discharges the wire electrode to the outside of the automatic wire connecting device.
Next, an operation of automatic wiring will be described.
In the present embodiment, when the wire electrode 20 is newly loaded or when the wire electrode is disconnected, the wire electrode 20 is sent out by the wire supply roller 3, passes through the wire guide upper portion 6a, the wire guide lower portion 6b, the lower roller 7, the tube 8, and the recovery nozzle 9, and is sandwiched between the wire recovery rollers 501a and 501b, and the wire connection is automatically completed. When the wire electrode 20 having passed through the recovery nozzle 9 is sandwiched between the wire recovery rollers 501a and 501b, the automatic wire connecting device sucks the wire electrode 20 having passed through the recovery nozzle 9 from the wire discharge side of the wire recovery unit 500, and guides the wire electrode to between the wire recovery rollers 501a and 501 b.
Fig. 2 is a schematic view showing the periphery of the wire collection unit in the automatic wire connecting device. A through hole 102 through which the wire electrode 20 passes together with a fluid (e.g., air) is formed in the suction portion 100. Further, the suction portion 100 is opened with compressed fluid introduction ports 101a and 101b for introducing compressed fluid (for example, air), and if the controller 300 sends the compressed fluid through the compressed fluid introduction ports 101a and 101b, the flow of the compressed fluid introduces ambient air to generate negative pressure. The negative pressure causes the suction force to be generated on the wire insertion side of the through hole 102 of the suction portion 100. That is, the control unit 300 controls the suction operation performed by the suction unit 100. The suction operation is an operation of sucking and discharging the wire electrode 20 together with the fluid from the wire discharge side of the wire collection unit 500.
The control unit 300 controls the driving unit 400 to move the thread collecting roller 501a in the opening/closing direction a in the figure, and the thread collecting rollers 501a and 501b are separated from each other from a state where the pair of thread collecting rollers 501 are in contact with each other. The operation of each part when performing automatic wire connection of the wire electrode will be described later. In the present embodiment, the thread collecting roller 501a is moved to generate a gap between the thread collecting rollers 501a and 501b, but the thread collecting roller 501b may be moved to generate a gap between the thread collecting rollers 501a and 501b, or both of the thread collecting rollers 501a and 501b may be moved to generate a gap between the thread collecting rollers 501a and 501 b. That is, the control unit 300 controls the driving unit 400 to perform the separation movement in which the pair of thread collecting rollers 501 are separated from each other in the opening/closing direction a. That is, the separation movement is an operation of moving the pair of thread collecting rollers 501 to a position where a gap is generated, and the gap generates an appropriate suction force on the thread inserting side of the thread collecting unit 500. When the state where the gap exists between the thread collecting rollers 501a and 501b is changed to the state where the gap does not exist, the control unit 300 controls the driving unit 400 to perform the closing movement for moving the pair of thread collecting rollers 501 so as to close in the opening/closing direction a. That is, the closing movement is an operation of moving to a position where the pair of thread collecting rollers 501 contact.
In the automatic wire connecting device configured as described above, when performing automatic wire connection of a wire electrode, the control unit 300 moves the pair of wire collecting rollers 501 apart to generate a gap between the wire collecting rollers 501a and 501b, and feeds the compressed fluid to the suction unit 100, and the suction unit 100 sucks the fluid from the wire discharge side of the wire collecting unit 500, whereby the fluid directed from the wire insertion side to the wire discharge side of the wire collecting unit 500 is also generated in the gap between the wire collecting rollers 501a and 501b, and the suction force is generated on the wire insertion side of the wire collecting unit 500. When the wire electrode 20 sucked by the suction force reaches the suction unit 100, the control unit 300 performs a closing movement in which the pair of wire collection rollers 501 are moved to the position where they are in contact with each other. Thus, the wire electrode 20 having passed through the wire collection nozzle 9 is sucked from the wire discharge side of the wire collection unit 500, and after being guided to the vicinity of the center of the gap between the wire collection rollers 501a and 501b, the pair of wire collection rollers 501 are moved to the closing movement of the contact position, so that the wire electrode 20 can be reliably sandwiched by the pair of wire collection rollers 501, and the wire electrode 20 can be reliably sucked and discharged by the suction unit 100.
Since the suction force generated on the wire insertion side of the wire recovery unit 500 by the fluid generated in the gap between the wire recovery rollers 501a and 501b greatly varies depending on the size of the gap between the wire recovery rollers 501a and 501b, the control unit 300 controls the drive unit 400 to move the wire recovery roller 501a to a position where the size of the gap is appropriate for generating the suction force. In this case, the recovery roller case 503 is moved in the opening/closing direction a by the driving of the driving unit 400, and the thread recovery roller 501a held by the recovery roller case 503 is also moved in the opening/closing direction a. A stopper 10 is provided on a movement path of the recovery roller housing 503, and when the separation movement is performed to separate the pair of thread recovery rollers 501, the recovery roller housing 503 and the stopper 10 interfere with each other on the movement path of the recovery roller housing 503, and therefore the stopper 10 limits the movement range of the recovery roller housing 503. That is, the stopper 10 mechanically limits the opening and closing movement range of the pair of line collecting rollers 501. The opening/closing movement range of the pair of thread recovery rollers 501 can be adjusted by adjusting the position of the stopper 10, and the size of the gap generated between the pair of thread recovery rollers 501 is equal to the opening/closing movement range, so that the size of the gap generated between the pair of thread recovery rollers 501 can be changed. As a result, the suction force generated on the wire insertion side of the wire collection unit 500 can be adjusted. The position of the stopper 10 is adjusted so that the separation movement of the thread collecting roller 501a is stopped at a position that becomes the size of the gap where an appropriate attractive force is generated. The position of the stopper 10 is adjusted by setting the position of the stopper 10 in advance at the time of shipment of the automatic wire connecting device, with the size of the optimum gap applicable to all wire electrode diameters as a standard value, but the position of the optimum stopper 10 may be individually set by the user in accordance with the wire electrode diameters to be used one by one. The control unit 300 controls the driving unit 400 to move the pair of wire collection rollers 501 apart until the stopper 10 restricts the separation movement when automatically connecting the wire electrode 20. The size of the gap between the pair of thread collecting rollers 501, that is, the method of adjusting the opening/closing movement range of the pair of thread collecting rollers 501 is merely an example, and is not limited to the method of adjusting the position of the stopper 10.
At this time, in the flow path from the recovery nozzle 9 side toward the suction portion 100 side, the gap between the thread recovery rollers 501a and 501b is made narrower than the diameter of the through hole 102 of the suction portion 100, and the flow of the fluid is throttled, whereby the flow velocity of the fluid passing through the gap between the thread recovery rollers 501a and 501b is increased, and the suction force can be increased. That is, the suction force can be increased by controlling the opening/closing movement of the pair of thread collecting rollers 501 so that the opening/closing movement range is narrower than the diameter of the through hole 102. The size of the gap is about 2 to 10 times the wire diameter, but the size of the gap, that is, the opening/closing movement range is adjusted so that an appropriate suction force is obtained according to the structure of the wire electric discharge machining apparatus to be used, because the size of the gap varies depending on not only the wire electrode 20 to be used but also the pressure and flow rate of the compressed fluid to be fed to the suction unit 100, the surface roughness of the inner wall of the component (the pipe 8, the recovery nozzle 9, and the like) on the wire travel path, the surface roughness of the wire recovery rollers 501a, 501b, and the like.
Fig. 3 is a perspective view showing the appearance of the suction unit 100. Since the suction force is weakened if the gap between the suction unit 100 and the thread recovery rollers 501a and 501b is large, the thread insertion side of the suction unit 100 has curved surfaces 103a and 103b in the shape of the thread recovery rollers 501a and 501b and is disposed close to the thread recovery rollers 501a and 501b in a range where the thread insertion side does not interfere with the thread recovery rollers 501a and 501 b. The yarn discharge side of the recovery nozzle 9 also has the same shape, and is provided so that the gap with the yarn recovery roller is as small as possible. Thus, when the wire electrode 20 is automatically connected, if a gap is formed between the wire recovery rollers 501a and 501b and the suction unit 100 sucks the fluid, the external air flows between the suction unit 100 and the wire recovery rollers 501a and 501b and between the recovery nozzle 9 and the wire recovery rollers 501a and 501b, and air flows along the peripheral walls of the wire recovery rollers 501a and 501b in a direction of separating the wire electrode 20 from the wire recovery rollers 501a and 501 b. Therefore, even if the leading end of the wire electrode 20 is wound around the wire collecting rollers 501a and 501b, the winding around the wire collecting rollers 501a and 501b is suppressed by the flow of the air, and the wire electrode 20 is reliably discharged from the suction unit 100 by being guided to the through hole 102 of the suction unit 100 and sucked. The structure and shape of the suction unit 100 are merely examples, and the structure and shape are not limited to these if the wire electrode 20 can be sucked and discharged through a fluid. The suction unit 100 described above is an example of an integral structure as shown in fig. 3, but may be a structure in which a plurality of members shown in fig. 4 and 5 are combined, for example. The suction unit 200 shown in fig. 4 and 5 is divided into a wire insertion side suction unit 201 and a wire discharge side suction unit 202, and assembled with the central axes aligned. If a compressed fluid is supplied from the compressed fluid inlet port 203, the compressed fluid is discharged to the wire discharge side of the suction portion 200 through the gap between the wire insertion side suction portion 201 and the wire discharge side suction portion 202, whereby the same function as that of the integrally structured suction portion shown in fig. 3 can be achieved.
Fig. 6 is a flowchart showing operations of each unit when the wire electrode 20 is automatically connected. In machining, the wire electrode 20 is sandwiched and collected by the wire collecting rollers 501a and 501b, and therefore the wire collecting rollers 501a and 501b are in a closed and contact state, but if automatic connection of the wire electrode 20 is started, the pair of wire collecting rollers 501 are moved apart to ensure a path of fluid that sucks the wire electrode 20 between the wire collecting rollers 501a and 501b, and a gap is generated between the wire collecting rollers 501a and 501 b. Therefore, the control unit 300 supplies air for linearly operating the air cylinder 401 to the air cylinder 401, and controls the driving unit 400 so that the gap between the thread collecting rollers 501a and 501b is a gap in which an appropriate suction force for sucking the thread electrode 20 is obtained (step S1). If a gap is generated between the wire recovery rollers 501a and 501b in step S1, which results in an appropriate suction force for sucking the wire electrode 20, the control unit 300 supplies the compressed fluid to the suction unit 100 to start the suction (step S2). Next, the control unit 300 controls the wire supply motor 4 to feed the wire electrode 20 to the wire collecting unit 500 by the wire supply roller 3 (step S3). At this time, the arrival determination unit 600 estimates the tip position of the wire electrode 20 by calculating the feeding amount of the wire electrode 20 based on the diameter of the wire supply roller 3 and the rotation speed of the wire supply motor 4, and determines whether or not the wire electrode has arrived at the suction unit 100. Specifically, the arrival determination section 600 determines whether or not the feeding amount of the wire electrode 20 exceeds the distance from the wire supply roller 3 to the suction section 100 (step S4). When the feed amount of the wire electrode 20 does not exceed the distance from the wire supply roller 3 to the suction unit 100 in step S4 (No in step S4), the arrival determination unit 600 determines that the leading end of the wire electrode 20 has not yet reached the suction unit 100, and repeats step S4 until the leading end of the wire electrode 20 reaches the suction unit 100. When the feeding amount of the wire electrode 20 exceeds the distance from the wire supply roller 3 to the suction unit 100 in step S4 (step S4: Yes), the arrival determination unit 600 determines that the leading end of the wire electrode 20 has arrived at the suction unit 100, and the control unit 300 having received the determination result controls the drive unit 400 so that the wire recovery rollers 501a and 501b are closed (step S5). Then, the control unit 300 controls the wire collecting motor 502 to rotate the wire collecting rollers 501a and 501b, and as a result, when the torque is applied to the wire supplying roller 3 via the wire electrode 20 (step S6: Yes), the control unit 300 determines that the automatic wire connection is successful and completes the automatic wire connection. When the control unit 300 controls the wire collecting motor 502 to rotate the wire collecting rollers 501a and 501b but torque is not applied to the wire supplying roller 3 by the wire electrode 20 (No in step S6), the control unit 300 determines that automatic wire connection has failed, cuts the wire electrode 20 that has been sent out and discards it (step S7), and performs automatic wire connection again from the beginning (step S1).
As described above, in the case of the method of estimating the tip position of the wire electrode 20 based on the diameter of the wire supply roller 3 and the rotation speed of the wire supply motor 4, there is no need to provide sensors on the traveling path of the wire electrode 20, and therefore, there is an advantage that the device can be configured with a simple structure and the manufacturing cost can be reduced.
Fig. 7 is a schematic view showing a state in which the wire collecting rollers 501a and 501b are closed and the wire electrode 20 is wound around after the automatic connection is completed in embodiment 1. When the wire recovery rollers 501a and 501b are closed and the electric discharge machining is performed after the automatic wire connection is completed, the control unit 300 also feeds the compressed fluid to the suction unit 100, whereby the wire electrode 20 fed out from the wire recovery rollers 501a and 501b is sucked by the suction unit 100 and discharged from the wire discharge side of the suction unit 100, and therefore, the wire electrode 20 can be prevented from being wound around the wire recovery rollers 501a and 501 b.
Next, a hardware configuration of the automatic wire connecting device 1000 will be explained. In the automatic wire connecting apparatus 1000, the control unit 300 and the arrival determination unit 600 are realized by a processing circuit. The processing circuit may be a processor and a memory that execute a program stored in the memory, or may be dedicated hardware.
Fig. 8 is a diagram showing an example in which the processing circuit of the automatic wire connecting device 1000 according to embodiment 1 is configured by a processor and a memory. In the case where the processing circuit is composed of the processor 91 and the memory 92, each function of the processing circuit of the automatic wire connecting device 1000 is realized by software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 92. In the processing circuit, each function is realized by reading out and executing a program stored in the memory 92 by the processor 91. That is, the processing circuit includes a memory 92, and the memory 92 stores a program for sequentially executing processing of each component of the automatic wire connecting device 1000. The program may be configured to cause a computer to execute the procedure and method of each component of the automatic wire connecting device 1000.
Here, the processor 91 may be a cpu (central Processing unit), a Processing device, an arithmetic device, a microprocessor, a microcomputer, a dsp (digital Signal processor), or the like. The memory 92 corresponds to, for example, a nonvolatile or volatile semiconductor memory such as a ram (random Access memory), a rom (read Only memory), a flash memory, an EPROM (erasable Programmable rom), and an EEPROM (Electrically EPROM), a magnetic disk, an optical disk, a compact disk, or a dvd (digital Versatile disc).
In the case where the processing circuit is formed of dedicated hardware, the processing circuit corresponds to, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an asic (application Specific Integrated circuit), an fpga (field Programmable Gate array), or a combination thereof. The functions of the components of the automatic wire connecting device 1000 may be realized by the processing circuit for each function, or may be realized by the processing circuit in a lump.
Further, the functions of the components of the automatic wire connecting device 1000 may be partly implemented by dedicated hardware and partly implemented by software or firmware. As described above, the processing circuit can implement the functions described above by dedicated hardware, software, firmware, or a combination thereof.
As described above, according to the present embodiment, when the automatic wire connection is started, the automatic wire connection device 1000 generates a gap between the pair of wire collection rollers 501, and sucks the wire electrode 20 fed by the wire supply roller 3 together with the fluid from the wire discharge side of the wire collection unit 500. After the wire electrode 20 is sucked to the suction unit 100, the pair of wire recovery rollers 501 are closed to sandwich the wire electrode 20, and automatic connection is completed. In the electric discharge machining, while the pair of wire collection rollers 501 are closed and the wire electrode 20 is collected by the wire collection unit 500, the wire electrode 20 fed by the wire supply roller 3 is also sucked together with the fluid from the wire discharge side of the wire collection unit 500. This can prevent the wire electrode 20 from being wound around the wire recovery rollers 501a and 501b during automatic wire connection, and can reliably perform automatic wire connection. In addition, winding of the wire electrode 20 around the wire recovery rollers 501a and 501b can be prevented even in machining after automatic wire connection.
In embodiment 1, the feed amount of the wire electrode 20 is calculated from the diameter of the wire supply roller 3 and the rotation speed of the wire supply motor 4, the leading end position of the wire electrode 20 is estimated, and whether or not the leading end position reaches the suction unit 100 is determined, so that when there is an estimation error, the leading end position of the wire electrode 20 may be moved to a position where the pair of wire recovery rollers 501 come into contact with each other in a closed state, and automatic wire connection may fail. In embodiment 2, a method will be described in which the position of the distal end of the wire electrode 20 is not estimated, but is detected by a sensor, and whether or not the wire electrode 20 has reached the suction unit 100 is reliably determined. The same portions as those in embodiment 1 will not be described, and portions different from those in embodiment 1 will be described.
Fig. 9 is a configuration diagram of a wire electric discharge machine according to embodiment 2. In the automatic wire connecting device 1001, a photoelectric sensor as the detection unit 40 for detecting the tip of the wire electrode 20 is provided on the wire discharge side of the suction unit 100. The detection unit 40 outputs the detection result to the arrival determination unit 601 which determines whether or not the position of the tip of the wire electrode 20 has reached the suction unit 100.
Fig. 10 is a diagram schematically showing the periphery of the wire collection unit of the automatic wire connecting device 1001 according to embodiment 2. The detection section 40 is provided such that the exit of the wire discharge side of the through-hole 102 is included in the detection range 41 of the detection section 40, and the leading end of the wire electrode 20 is detected if the leading end of the wire electrode 20 discharged from the wire discharge side of the through-hole 102 passes through the detection range 41. When the detection unit 40 detects the leading end of the wire electrode 20, the arrival determination unit 601 determines that the leading end position of the wire electrode 20 has reached the suction unit 100. While the detection unit 40 does not detect the leading end of the wire electrode 20, it is determined that the leading end position of the wire electrode 20 has not reached the suction unit 100. When the arrival determination unit 601 determines that the leading end position of the wire electrode 20 has reached the suction unit 100, the control unit 300 controls the drive unit 400 so that the pair of line collecting rollers 501 close and move to the position where they are in contact with each other. Then, the same processing as in embodiment 1 is performed. In embodiment 2, a case where a photoelectric sensor is used as the detection unit 40 has been described as an example, but a touch sensor, a vision sensor, and the like may be considered in addition to the photoelectric sensor, and the present invention is not limited to the above case.
As described above, according to the present embodiment, the sensor detects the tip of the wire electrode 20, so that whether or not the wire electrode 20 has reached the suction unit 100 can be reliably determined, and the success rate of automatic wire connection can be improved.
In embodiment 1, a method of moving the thread collecting roller by using the air cylinder 401 in the driving portion 400 is described. In embodiment 3, a method of moving the thread collecting roller by using the servo motor 412 in the driving section 410 will be described. The same portions as those in embodiment 1 will not be described, and portions different from those in embodiment 1 will be described.
Fig. 11 is a configuration diagram of a wire electric discharge machining apparatus according to embodiment 3 of the present invention. The automatic wire connecting device 1002 includes: a driving unit 410 that opens and closes the pair of thread collection rollers 501; and a setting unit 700 that sets the size of the gap between the pair of thread collection rollers 501, that is, the opening/closing movement range of the pair of thread collection rollers 501. The setting unit 700 outputs the set opening/closing movement range to the control unit 301. When there is an input of the opening/closing movement range in the setting unit 700, the setting unit 700 sets the input value as the opening/closing movement range and outputs the input value to the control unit 301. When the setting unit 700 does not input the opening/closing movement range, the setting unit 700 calculates the optimal opening/closing movement range based on the wire diameter input from the operator before automatic wire connection and machining, sets the calculated value as the opening/closing movement range, and outputs the calculated value to the control unit 301.
Fig. 12 is a diagram schematically showing the periphery of the wire collection unit of the automatic wire connecting device 1002 according to embodiment 3. The driving unit 410 includes: a servo motor 412; and a rack gear 411 which is composed of a rack 411a with teeth on a flat plate-like bar and a pinion 411b of a circular gear. The control unit 301 adjusts the current supplied to the servomotor 412 and performs feedback control so that the size of the gap between the thread collecting rollers 501a and 501b becomes equal to the set opening/closing movement range, based on the position information read from the encoder included in the servomotor 412 and the opening/closing movement range set by the setting unit 700. In embodiment 1, the size of the gap generated between the pair of thread recovery rollers 501 is adjusted by the stopper 10 that mechanically restricts the opening/closing movement range of the pair of thread recovery rollers 501, but in embodiment 3, the size of the gap generated between the pair of thread recovery rollers 501 is set by the setting unit 700, and therefore the stopper 10 is not necessary.
As described above, according to the present embodiment, the size of the gap can be adjusted with high accuracy and the suction force can be adjusted with high accuracy by controlling the driving unit 410 so as to move the pair of thread collecting rollers 501 to open and close based on the position information of the encoder included in the servo motor 412 and the opening and closing movement range set by the setting unit 700. In addition, the size of the gap can be easily changed, and the suction force can be easily adjusted.
In embodiment 1, the wire electrode 20 is sucked from the wire discharge side of the wire collecting unit 500, thereby preventing the wire electrode 20 from being wound around the wire collecting rollers 501a and 501 b. In embodiment 4, a method of further increasing the suction force and improving the effect of preventing the wire electrode 20 from being wound around the wire recovery rollers 501a and 501b will be described. The same portions as those in embodiment 1 will not be described, and portions different from those in embodiment 1 will be described.
Fig. 13 is a perspective view showing an example of the configuration around the suction unit and the thread collection unit of the automatic thread connecting device 1003 according to embodiment 4. As shown in fig. 10, the side covers 30a and 30b are provided so as to cover the gaps generated when the thread recovery rollers 501a and 501b are separated from the both side surfaces of the thread recovery rollers 501a and 501b on which the rotation axes are present. The size of the side covers 30a and 30b may be set to a size that can cover at least the gap generated when the thread recovery rollers 501a and 501b are separated. With the above-described configuration, the direction of the fluid flowing between the wire recovery rollers 501a and 501b is restricted, and the fluid is concentrated in the portion of the gap generated when the wire recovery rollers 501a and 501b are separated, thereby increasing the suction force.
As described above, according to the present embodiment, the suction force can be increased by providing the side covers so as to cover the gap generated between the pair of thread recovery rollers 501 from both side surfaces of the pair of thread recovery rollers 501 on which the rotation axis exists, and restricting the direction of the fluid flowing between the pair of thread recovery rollers 501.
The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.
Description of the reference numerals
1 bobbin, 2a, 2b pulley, 3 line supply roller, 4 line supply motor, 5a, 5b supply pinch roller, 6a line guide upper portion, 6b line guide lower portion, 7 lower roller, 8 tube, 9 recovery nozzle, 10 stopper, 11a, 11b power supply, 20 line electrode, 21 workpiece, 22 workpiece mounting platform, 23 processing tank, 24 processing liquid, 30a, 30b side cover, 40 detection portion, 41 detection range of detection portion, 91 processor, 92 memory, 100, 200 suction portion, 101a, 101b, 203 compressed fluid inlet port, 102, 204 through hole, 103a, 103b, 205a, 205b curved surface, 201 line insertion side suction portion, 202 line discharge side suction portion, 300, 301 control portion, 400, 410 drive portion, 401 cylinder, 402 hook, 401 rod, 411 rack, 403 a rack, 411b, 412 servomotor, 500 line recovery portion, 501a pair of thread take-up rollers, 501a and 501b thread take-up rollers, 502 a thread take-up motor, 503 take-up roller housing, 600 and 601 reach the determination unit, 700 setting unit, 1000, 1001, 1002 and 1003 thread automatic wiring device.
Claims (9)
1. An automatic wire connecting device for a wire electric discharge machine, comprising:
a wire collecting unit that inserts and sandwiches the wire electrode, which has passed through a region where electric discharge machining is performed on the workpiece, between a pair of wire collecting rollers and discharges the wire electrode;
a driving unit that opens and closes the pair of thread recovery rollers;
a wire feed motor that drives a wire feed roller in a feeding direction of the wire electrode;
a suction unit that sucks and discharges the wire electrode together with a fluid from a wire discharge side of the wire collection unit; and
a control unit that controls the opening and closing movement by the drive unit, controls the suction operation by the suction unit, and controls the wire electrode feeding operation by the wire supply motor,
the control unit controls the wire electrode to be sucked by a suction operation of the suction unit and to start feeding of the wire electrode after the separation movement of separating the pair of wire collection rollers by the opening and closing movement is started at the start of automatic connection of the wire electrode,
when the leading end of the wire electrode reaches the suction unit, the closing movement for closing the pair of wire collection rollers is controlled by the opening/closing movement.
2. The automatic wire connecting device of a wire electric discharge machine according to claim 1,
the suction unit has a through hole through which the wire electrode passes together with the fluid,
the control unit controls the opening/closing movement such that the opening/closing movement range of the pair of thread collection rollers is narrower than the diameter of the through hole.
3. The automatic wire connecting device of a wire electric discharge machine according to claim 1 or 2,
further comprising an arrival determination unit for determining whether or not the position of the leading end of the wire electrode has reached the suction unit,
the control unit controls the drive unit so as to perform the closing movement when it is determined that the leading end of the wire electrode has reached the suction unit based on a determination result of the arrival determination unit.
4. The automatic wire connecting device of a wire electric discharge machine according to claim 3,
the arrival determination unit calculates a feeding amount of the wire electrode based on a diameter of the wire supply roller and a rotation speed of the wire supply motor, and determines whether or not a position of a leading end of the wire electrode has arrived at the suction unit.
5. The automatic wire connecting device of a wire electric discharge machine according to claim 3,
further comprising a detection unit for detecting the leading end of the wire electrode on the wire discharge side of the suction unit,
the arrival determination unit determines that the position of the leading end of the wire electrode has reached the suction unit when the detection unit detects the leading end of the wire electrode.
6. The automatic wire connecting device of a wire electric discharge machine according to any one of claims 1 to 5,
and a stopper for mechanically limiting the opening/closing movement range of the pair of thread take-up rollers,
the driving section performs the opening and closing movement by driving of an air cylinder,
the control portion controls the drive portion so that the separation movement is performed until the separation movement is restricted by the stopper.
7. The automatic wire connecting device of a wire electric discharge machine according to any one of claims 1 to 5,
further comprising a setting unit for setting an opening/closing movement range of the pair of thread take-up rollers,
the driving section performs the opening and closing movement by driving of a servo motor,
the control unit controls the drive unit so as to perform the opening/closing movement based on position information of an encoder included in the servo motor and the opening/closing movement range.
8. The automatic wire connecting device of a wire electric discharge machine according to claim 7,
the setting unit sets the opening/closing movement range based on the wire electrode diameter.
9. The automatic wire connecting device of a wire electric discharge machine according to any one of claims 1 to 8,
the yarn feeding device further comprises a side cover which is provided so as to cover a gap generated between the pair of yarn collecting rollers by the separation movement from both side surfaces of the pair of yarn collecting rollers on which the rotation shaft is provided, and which restricts a direction of the fluid flowing between the pair of yarn collecting rollers.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2019/006988 WO2020174518A1 (en) | 2019-02-25 | 2019-02-25 | Automatic wire threader for wire electrical discharge machining apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113453832A true CN113453832A (en) | 2021-09-28 |
| CN113453832B CN113453832B (en) | 2022-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980092644.9A Active CN113453832B (en) | 2019-02-25 | 2019-02-25 | Automatic wire connecting device of wire electric discharge machining device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6680407B1 (en) |
| CN (1) | CN113453832B (en) |
| WO (1) | WO2020174518A1 (en) |
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| JPH071246A (en) * | 1993-06-15 | 1995-01-06 | Yazaki Corp | Guide device for wire for electric discharge machine and wire cutter having the guide device |
| JP2005125413A (en) * | 2003-10-21 | 2005-05-19 | Sodick Co Ltd | Device for collecting cut piece of wire electrode |
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| CN104245202A (en) * | 2013-04-12 | 2014-12-24 | 三菱电机株式会社 | Wire-suctioning device and wire-collecting device |
| CN106029275A (en) * | 2014-02-20 | 2016-10-12 | 三菱电机株式会社 | Wire electric discharge machining apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0259221A (en) * | 1988-08-24 | 1990-02-28 | Mitsubishi Electric Corp | Wire electro-discharge machining unit |
| JPH052830U (en) * | 1991-01-16 | 1993-01-19 | 三菱電機株式会社 | Wire guide device for wire cut electric discharge machine |
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2019
- 2019-02-25 WO PCT/JP2019/006988 patent/WO2020174518A1/en active Application Filing
- 2019-02-25 CN CN201980092644.9A patent/CN113453832B/en active Active
- 2019-02-25 JP JP2019542240A patent/JP6680407B1/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH071246A (en) * | 1993-06-15 | 1995-01-06 | Yazaki Corp | Guide device for wire for electric discharge machine and wire cutter having the guide device |
| JP2005125413A (en) * | 2003-10-21 | 2005-05-19 | Sodick Co Ltd | Device for collecting cut piece of wire electrode |
| JP2006224215A (en) * | 2005-02-16 | 2006-08-31 | Seibu Electric & Mach Co Ltd | Wire electric discharge machine |
| CN101372060A (en) * | 2007-08-24 | 2009-02-25 | 西部电机株式会社 | Wire feed in wire-cut electrical discharge machine |
| CN103874555A (en) * | 2011-10-13 | 2014-06-18 | 三菱电机株式会社 | Wire electric discharge machine, and wire electrode feeding method employed therein |
| CN104245202A (en) * | 2013-04-12 | 2014-12-24 | 三菱电机株式会社 | Wire-suctioning device and wire-collecting device |
| CN106029275A (en) * | 2014-02-20 | 2016-10-12 | 三菱电机株式会社 | Wire electric discharge machining apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113453832B (en) | 2022-11-08 |
| JP6680407B1 (en) | 2020-04-15 |
| JPWO2020174518A1 (en) | 2021-03-11 |
| WO2020174518A1 (en) | 2020-09-03 |
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