JPWO2020174518A1 - Automatic wire connection device for wire electric discharge machining equipment - Google Patents

Abstract

The automatic wire connection device (1000) of the wire discharge processing device inserts and sandwiches the wire electrode (20) that has passed through the region for discharging the workpiece (21) between the pair of wire recovery rollers (501) and discharges the wire electrode (20). A wire collecting unit (500), a driving unit (400) for opening and closing a pair of wire collecting rollers (501), a wire feeding motor (4) for driving the wire feeding roller (3), and a wire collecting unit (4). The suction part (100) that sucks and discharges the wire electrode together with the fluid from the wire discharge side of 500) and the suction part (100) after opening the pair of wire recovery rollers (501) at the start of automatic connection. The wire electrode (20) is sucked by the suction operation of the wire electrode (20), and control is performed so as to start sending out the wire electrode (20). When the tip of the wire electrode (20) reaches the suction portion (100), a pair of wires A control unit (300) that controls the closing movement of closing the recovery roller (501) is provided.

Description

The present invention relates to a wire electric discharge machining apparatus that cuts or removes a work piece by repeatedly generating a discharge between the wire electrode and the work piece, and in particular, wire the wire electrode from a wire feeding roller to a wire. It relates to an automatic wire connection device that automatically loads up to a recovery roller.

Generally, a wire discharge processing device holds a wire feeding part that pulls out a wire electrode from a wire bobbin around which the wire electrode is wound and sends it out by a wire feeding roller, a power supply that supplies electric energy to the wire electrode, and a wire electrode. A wire guide unit including a guide to be wound and a used wire electrode that passes through an area for discharge processing of a work piece are sandwiched between a pair of wire collection rollers and wound up, and the wire is collected to be discharged to the outside of the wire discharge processing apparatus. Have a department. In the present application, a component / device having a function of feeding or guiding a wire electrode from a wire feeding section to a wire collecting section is defined as an automatic wire connecting device. When a new wire electrode is loaded or when the wire electrode is broken, the wire electrode is automatically loaded into the wire electric discharge machine by using this automatic wire connection device. That is, automatic wiring is performed.

A wire electrode having a diameter of 0.03 mm to 0.3 mm is often used in a wire electric discharge machine. However, the ultrafine wire wire electrode having a diameter of less than 0.1 mm, which is particularly used for microfabrication, has low rigidity and tends to bend unless tension is applied to the wire electrode. Therefore, while the wire electrode is sandwiched between the pair of wire collection rollers and collected, the wire electrode discharged from the wire collection unit may be wound around the wire collection roller, and the processing may have to be interrupted. To solve this problem, Patent Document 1 discloses a technique of feeding a wire electrode between wire recovery rollers by separating a pair of wire recovery rollers when the wire electrodes are automatically connected, and Patent Document 2 discloses a wire recovery unit. A technique for preventing the wire electrode from being wound around the wire recovery roller by sucking the wire electrode from the wire discharge side of the above is disclosed.

Japanese Unexamined Patent Publication No. 2006-247755 WO2014 / 167724

In Patent Document 1, the transport fluid is supplied from the vicinity of the lower guide roller toward the wire recovery section and the wire electrode is guided to the wire recovery section, but the transport fluid supply port is separated from the wire recovery section. Therefore, there is a possibility that the wire electrode cannot be guided so as to pass through the gap between the pair of wire recovery rollers.

Further, in Patent Document 2, it is possible to prevent the wire electrode from winding around the wire recovery roller during wire recovery after the completion of automatic connection, but the wire electrode for automatic connection is inside the pipe near the wire recovery portion. Since it is separated from the transport fluid and the induction of the transport fluid is eliminated, in the case of a wire electrode with low rigidity, the wire electrode deviates from the original traveling path, and the wire electrode cannot be sandwiched between the pair of wire recovery rollers. There is a problem that the automatic connection fails, and there is no disclosure or suggestion about the efficiency of the automatic connection work until the completion of the automatic connection in which the wire electrode passes between the wire recovery rollers.

The present invention has been made in view of the above, and an object of the present invention is to obtain an automatic wire connection device that realizes both reliable automatic connection of wire electrodes and prevention of wrapping around a wire recovery roller during processing. ..

In order to solve the above-mentioned problems and achieve the object, the automatic wire connection device of the wire discharge processing device of the present invention inserts a wire electrode that has passed through a region for discharging a workpiece between a pair of wire recovery rollers. A wire recovery unit that sandwiches and discharges, a drive unit that moves the pair of wire collection rollers to open and close, and a wire feed motor that drives the wire feed rollers in the feed direction of the wire electrodes. And the suction part that sucks and discharges the wire electrode together with the fluid from the wire discharge side of the wire collection part, the control of opening and closing movement by the drive part, the control of the suction operation by the suction part, and the sending operation of the wire electrode by the wire feeding motor. It is provided with a control unit for controlling the above. At the start of automatic wire connection of the wire electrodes, the control unit performs an open movement to open the pair of wire recovery rollers by opening and closing movements, and then sucks the wire electrodes by the suction operation of the suction unit and starts feeding the wire electrodes. It is characterized in that when the tip of the wire electrode reaches the suction portion, the pair of wire recovery rollers are closed and closed by opening and closing.

The automatic wire connection device of the wire electric discharge machining device according to the present invention can realize both reliable automatic connection of wire electrodes and prevention of wrapping around a wire recovery roller during processing, and when automatic connection fails or processing This has the effect of reducing the setup time that accompanies the occurrence of winding around the wire recovery roller inside, and improving productivity.

The figure which shows the structure of the wire electric discharge machining apparatus which concerns on Embodiment 1, and the wire automatic wiring apparatus. The figure which represented the periphery of the wire recovery part which concerns on Embodiment 1. A perspective view showing the appearance of the suction portion according to the first embodiment. FIG. 5 is a cross-sectional view showing a structure when the suction portion according to the first embodiment is composed of a plurality of parts. A perspective view showing a structure when the suction portion according to the first embodiment is composed of a plurality of parts. A flowchart showing the operation of each part when performing automatic wire connection in the automatic wire connection device according to the first embodiment. Schematic diagram schematically showing a state in which a pair of wire recovery rollers are closed and a wire electrode is wound up in the wire recovery unit according to the first embodiment. The figure which shows the example of the case where the processing circuit included in the wire automatic wire connection apparatus which concerns on Embodiment 1 is configured by a processor and a memory. The figure which shows the structure of the wire electric discharge machining apparatus and the wire automatic wiring apparatus which concerns on Embodiment 2. The figure which represented the periphery of the wire recovery part which concerns on Embodiment 2 schematically. The figure which shows the structure of the wire electric discharge machining apparatus and the wire automatic wiring apparatus which concerns on Embodiment 3. The figure which represented the periphery of the wire recovery part which concerns on Embodiment 3 schematically. The perspective view which showed the structure which installed the side cover which limits the direction of the fluid flowing between a pair of wire collection rollers in the wire collection part which concerns on Embodiment 4.

Hereinafter, the automatic wire connection device according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a configuration diagram of a wire electric discharge machine according to the first embodiment of the present invention. Of these, the automatic wire connecting device 1000 includes pulleys 2a and 2b, a wire feeding roller 3, a wire feeding motor 4, a feeding pinch rollers 5a and 5b, a wire guide upper part 6a, and a wire guide lower part 6b. The lower roller 7, the pipe 8, the recovery nozzle 9, the control unit 300, the drive unit 400, the wire collection unit 500, the suction unit 100, the arrival determination unit 600, and the stopper 10 are provided. The wire recovery unit 500 includes a pair of wire recovery rollers 501 composed of a wire recovery roller 501a and a wire recovery roller 501b, a wire recovery motor 502, and a recovery roller housing 503, and has a wire electrode 20 as a pair of wire recovery rollers. It is collected by inserting it between 501, sandwiching it, and discharging it. The drive unit includes an air cylinder 401, a rod 403, and a hook 402, and the air cylinder 401 moves linearly along the opening / closing direction A so that a pair of wire recovery rollers 501 move along the opening / closing direction A. The movement to open and close, that is, the opening and closing movement is performed. The air cylinder 401 is an example and may be a hydraulic cylinder. The control unit 300 adjusts the amount of air supplied to the air cylinder 401 and controls the drive unit 400. That is, the control unit 300 controls the opening / closing movement by the drive unit 400. The suction unit 100 is an ejector that sucks and discharges the wire electrode 20 from the wire discharge side of the wire recovery unit 500 with a fluid. The arrival determination unit 600 determines whether the position of the tip of the wire electrode 20 has reached the suction unit 100.

Next, the feeding operation of the wire electrode during processing will be described.
The wire electrode 20 drawn out from the wire bobbin 1 is sent out from the wire feeding roller 3 via the pulleys 2a and 2b. The control unit 300 controls the wire feeding motor 4 that drives the wire feeding roller 3 in the feeding direction or the rewinding direction of the wire electrode 20, and accelerates / decelerates the feeding operation, the rewinding operation, and the feeding speed of the wire electrode 20. To control. That is, the control unit 300 controls the feeding operation, rewinding operation, and acceleration / deceleration of the feeding speed of the wire electrode 20 by the wire feeding motor 4. Further, the wire electrode 20 is pressed against the wire feeding roller 3 by the feeding pinch rollers 5a and 5b. The delivered wire electrode 20 is used for processing the workpiece 21 between the upper wire guide 6a and the lower wire guide 6b, and then passes through the lower roller 7, the pipe 8, and the recovery nozzle 9, and the wire recovery roller 501a, It reaches 501b. The wire recovery roller 501b is driven by the wire recovery motor 502, winds up the wire electrode 20 between the wire recovery roller 501a and the wire recovery roller 501b, and discharges the wire electrode 20 to the outside of the automatic wire connection device.

Next, the 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 broken, the wire electrode 20 is fed by the wire feeding roller 3, and the wire guide upper portion 6a, the wire guide lower portion 6b, and the lower roller are fed. 7. Passing through the pipe 8 and the recovery nozzle 9 until the wire is sandwiched between the wire recovery rollers 501a and 501b, the automatic connection is completed. In this automatic wire connection device, when the wire electrode 20 that has passed through the recovery nozzle 9 is sandwiched between the wire recovery rollers 501a and 501b, the wire electrode 20 that has passed through the recovery nozzle 9 is sucked from the wire discharge side of the wire recovery unit 500. By doing so, it is guided between the wire recovery rollers 501a and 501b.

FIG. 2 is a diagram schematically showing the periphery of the wire collecting portion in the automatic wire connecting device. Inside the suction unit 100, there is a through hole 102 through which the wire electrode 20 passes together with the fluid (for example, air). Further, the suction unit 100 is opened with compressed fluid introduction ports 101a and 101b for taking in the compressed fluid (for example, air), and when the control unit 300 sends the compressed fluid from the compressed fluid introduction ports 101a and 101b, the compressed fluid is introduced. The flow draws in the surrounding air and creates a negative pressure. This negative pressure generates a suction force 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 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 collecting unit 500.

By controlling the drive unit 400, the control unit 300 moves the wire recovery roller 501a along the opening / closing direction A in the drawing so that the pair of wire recovery rollers 501 are separated from the contacted state. A gap can be created between the wire recovery rollers 501a and 501b. The operation of each part when the wire electrodes are automatically connected will be described later. In this embodiment, the wire recovery roller 501a is moved to create a gap between the wire recovery rollers 501a and 501b, but the wire recovery roller 501b is moved to create a gap between the wire recovery rollers 501a and 501b. Alternatively, both the wire recovery rollers 501a and 501b may be moved to create a gap between the wire recovery rollers 501a and 501b. That is, the control unit 300 controls the drive unit 400 to perform an open movement in which the pair of wire recovery rollers 501 move so as to open along the opening / closing direction A. That is, the open movement is an operation of moving the pair of wire recovery rollers 501 to a position where a gap for generating an appropriate suction force is generated on the wire insertion side of the wire recovery unit 500. Further, when changing from a state where there is a gap between the wire recovery rollers 501a and 501b to a state where there is no gap, the control unit 300 controls the drive unit 400 so that the pair of wire recovery rollers 501 are moved in the opening / closing direction A. Make a closing move that moves to close along. That is, the closing movement is an operation of moving the pair of wire collecting rollers 501 to a position where they are in contact with each other.

In the automatic wire connection device configured as described above, when the wire electrodes are automatically connected, the control unit 300 opens and moves the pair of wire recovery rollers 501 to create a gap between the wire recovery rollers 501a and 501b, and further. The compressed fluid is sent to the suction unit 100, and the suction unit 100 sucks the fluid from the wire discharge side of the wire collection unit 500, so that the gap between the wire collection rollers 501a and 501b is also formed from the wire insertion side of the wire collection unit 500. A fluid is generated toward the wire discharge side, and a suction force is generated on the wire insertion side of the wire recovery unit 500. When the wire electrode 20 sucked by this suction force reaches the suction unit 100, the control unit 300 closes and moves to a position where the pair of wire recovery rollers 501 come into contact with each other. As a result, the wire electrode 20 that has passed through the recovery nozzle 9 is sucked from the wire discharge side of the wire recovery unit 500 to guide the wire recovery rollers 501a and 501b to the vicinity of the center of the gap, and then the pair of wire recovery rollers 501. Since the wire is closed and moved to the position where the wires are in contact with each other, the wire electrode 20 can be reliably sandwiched between the pair of wire recovery rollers 501, and the suction unit 100 can reliably suck and discharge the wire electrode 20.

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 collection rollers 501a and 501b changes greatly depending on the size of the gap between the wire collection rollers 501a and 501b, so that the control unit 300 Controls the drive unit 400 and moves the wire recovery roller 501a to a position where the size of the gap for generating an appropriate suction force is large. In this case, the recovery roller housing 503 moves along the opening / closing direction A by driving the drive unit 400, so that the wire recovery roller 501a held by the recovery roller housing 503 also moves along the opening / closing direction A. A stopper 10 is installed on the movement path of the recovery roller housing 503, and when the recovery roller housing 503 and the stopper 10 are moved so as to open between the pair of wire recovery rollers 501, the recovery roller housing 503 and the stopper 10 move to the recovery roller housing 503. The stopper 10 limits the range of movement of the recovery roller housing 503 because it interferes with the movement path of the recovery roller housing 503. That is, the stopper 10 mechanically limits the opening / closing movement range of the pair of wire recovery rollers 501. The open / close movement range of the pair of wire 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 wire recovery rollers 501 is equal to the open / close movement range. The size of the gap generated between the recovery rollers 501 can be changed. As a result, the suction force generated on the wire insertion side of the wire collecting unit 500 can be adjusted. The position of the stopper 10 is adjusted so that the opening movement of the wire collecting roller 501a stops at a position where the size of the gap for generating an appropriate suction force is large. The position of the stopper 10 is adjusted by setting the position of the stopper 10 in advance at the time of shipment of this wire automatic connection device with the optimum gap size applicable to all wire electrode diameters as a standard value, but the user uses it sequentially. The optimum position of the stopper 10 may be individually set according to the wire electrode diameter. When the wire electrode 20 is automatically connected, the control unit 300 controls the drive unit 400 so as to open and move the pair of wire recovery rollers 501 until the opening movement is restricted by the stopper 10. The size of the gap between the pair of wire recovery rollers 501, that is, the method of adjusting the opening / closing movement range of the pair of wire recovery rollers 501 is not limited to the method of adjusting the position of the stopper 10 only by showing an example.

At this time, in the flow path from the recovery nozzle 9 side to the suction portion 100 side, the gap between the wire recovery rollers 501a and 501b is made narrower than the diameter of the through hole 102 of the suction portion 100 to narrow the flow of the fluid. , The flow velocity of the fluid passing through the gap between the wire recovery rollers 501a and 501b can be increased to improve the suction force. That is, the suction force can be improved by controlling the opening / closing movement so that the opening / closing movement range of the pair of wire recovery rollers 501 is narrower than the diameter of the through hole 102. The size of this gap is about 2 to 10 times the wire electrode diameter as a guide, but not only the wire electrode 20 to be used, but also the pressure and flow rate of the compressed fluid sent to the suction unit 100 and the wire traveling path. Since it changes depending on the surface roughness of the inner wall of the component parts (pipe 8, recovery nozzle 9, etc.), the surface roughness of the wire recovery rollers 501a and 501b, etc., an appropriate suction force can be obtained depending on the structure of the wire electric discharge machining device to be applied. Adjust the size of the gap, that is, the opening / closing movement range so that it can be opened and closed.

FIG. 3 is a perspective view showing the appearance of the suction unit 100. If the gap between the suction unit 100 and the wire recovery rollers 501a and 501b is large, the suction force is weakened. Therefore, the wire insertion side of the suction unit 100 has curved surfaces 103a and 103b that follow the shapes of the wire recovery rollers 501a and 501b. Place them close to each other within a range that does not interfere with the wire recovery rollers 501a and 501b. Further, the wire discharge side of the recovery nozzle 9 has the same shape, and is installed so that the gap with the wire recovery roller is as small as possible. As a result, when the wire electrode 20 is automatically connected, a gap is created between the wire recovery rollers 501a and 501b, and when the suction unit 100 sucks the fluid, between the suction unit 100 and the wire recovery rollers 501a and 501b, and the recovery nozzle. Outside air flows in between the wire recovery rollers 501a and 501b, and an air flow is generated along the peripheral wall of the wire recovery rollers 501a and 501b in a direction in which the wire electrode 20 is peeled off from the wire recovery rollers 501a and 501b. .. Therefore, even if the tip of the wire electrode 20 tries to wind around the wire recovery rollers 501a and 501b, it is suppressed from being wound around the wire recovery rollers 501a and 501b due to the air flow, and the tip of the wire electrode 20 is guided to the through hole 102 of the suction portion 100. By being sucked, the wire electrode 20 is surely discharged from the suction portion 100. The structure and shape of the suction unit 100 is an example, and the present invention is not limited to this as long as the wire electrode 20 can be sucked and discharged by a fluid. Although the suction unit 100 shows an example of an integrated structure as shown in FIG. 3, for example, a structure in which a plurality of parts as shown in FIGS. 4 and 5 are combined may be used. The suction unit 200 shown in FIGS. 4 and 5 is divided into a wire insertion side suction unit 201 and a wire discharge side suction unit 202, and has a structure in which the central axes are aligned and assembled. When the compressed fluid is supplied from the compressed fluid introduction port 203, the compressed fluid is ejected to the wire discharge side of the suction unit 200 through the gap between the wire insertion side suction unit 201 and the wire discharge side suction unit 202. It is possible to realize the same function as the suction portion having an integrated structure as shown in FIG.

FIG. 6 is a flowchart showing the operation of each part when the wire electrode 20 is automatically connected. During processing, the wire electrode 20 is sandwiched between the wire recovery rollers 501a and 501b for recovery. Therefore, the wire recovery rollers 501a and 501b are in a closed and contacted state, but when the automatic connection of the wire electrode 20 starts, the wire recovery roller A pair of wire recovery rollers 501 are opened and moved to create a gap between the wire recovery rollers 501a and 501b in order to secure a path for the fluid that sucks the wire electrode 20 between 501a and 501b. Therefore, the control unit 300 supplies the air cylinder 401 with air for linear operation of the air cylinder 401, and an appropriate suction force for sucking the wire electrode 20 between the wire recovery rollers 501a and 501b is obtained. The drive unit 400 is controlled so as to form a gap (step S1). When a gap is created between the wire recovery rollers 501a and 501b in step S1 to obtain an appropriate suction force for sucking the wire electrode 20, the control unit 300 supplies the compressed fluid to the suction unit 100 and starts suction. (Step S2). Next, the control unit 300 controls the wire feeding motor 4, and the wire feeding roller 3 feeds the wire electrode 20 toward the wire collecting unit 500 (step S3). At this time, the arrival determination unit 600 estimates the tip position of the wire electrode 20 by calculating the feed amount of the wire electrode 20 from the diameter of the wire feed roller 3 and the rotation speed of the wire feed motor 4, and the suction unit 100. Determine if you have reached. Specifically, the arrival determination unit 600 determines whether or not the delivery amount of the wire electrode 20 exceeds the distance from the wire feeding roller 3 to the suction unit 100 (step S4). In step S4, when the feeding amount of the wire electrode 20 does not exceed the distance from the wire feeding roller 3 to the suction unit 100 (step S4: No), the tip of the wire electrode 20 reaches the suction unit 100 in the arrival determination unit 600. It is determined that the wire electrode 20 has not yet reached, and step S4 is repeated until the tip of the wire electrode 20 reaches the suction portion 100. In step S4, when the feeding amount of the wire electrode 20 exceeds the distance from the wire feeding roller 3 to the suction unit 100 (step S4: Yes), the tip of the wire electrode 20 reaches the suction unit 100 in the arrival determination unit 600. The control unit 300, which determines that the wire has arrived and receives the determination result, controls the drive unit 400 so that the wire recovery rollers 501a and 501b are closed (step S5). Then, when the control unit 300 controls the wire recovery motor 502 to rotate the wire recovery rollers 501a and 501b, and as a result, a rotational moment is applied to the wire feeding roller 3 through the wire electrode 20 (step S6: Yes), the control unit 300 300 determines that the automatic connection is successful and completes the automatic connection. When the control unit 300 controls the wire recovery motor 502 to rotate the wire recovery rollers 501a and 501b, but no rotational moment is applied to the wire feeding roller 3 through the wire electrode 20 (step S6: No), the control unit 300 Determines that the automatic connection has failed, cuts and discards the sent out wire electrode 20 (step S7), and restarts the automatic connection from the beginning (step S1).

As described above, when the method of estimating the tip position of the wire electrode 20 from the diameter of the wire feeding roller 3 and the rotation speed of the wire feeding motor 4 is adopted, the sensors are installed on the traveling path of the wire electrode 20. Since there is no need, the device can be made into a simple structure, and there is an advantage that the manufacturing cost can be suppressed.

FIG. 7 is a schematic view showing a state in which the wire recovery rollers 501a and 501b are closed and the wire electrode 20 is wound up after the automatic connection is completed in the first embodiment. Even when the automatic connection is completed and the wire recovery rollers 501a and 501b are closed to perform discharge processing, the control unit 300 sends the compressed fluid to the suction unit 100 to feed the wire electrodes from the wire recovery rollers 501a and 501b. Since the suction unit 100 sucks the wire 20 and discharges the wire electrode from the wire discharge side of the suction unit 100, it is possible to prevent the wire electrode 20 from being wound around the wire recovery rollers 501a and 501b.

Next, the hardware configuration of the automatic wire connection device 1000 will be described. In the automatic wire connection device 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 memory for executing a program stored in the memory, or may be dedicated hardware.

FIG. 8 is a diagram showing an example in which the processing circuit included in the automatic wire connection device 1000 according to the first embodiment is configured by a processor and a memory. When the processing circuit is composed of the processor 91 and the memory 92, each function of the processing circuit of the automatic wire connection device 1000 is realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 92. In the processing circuit, each function is realized by the processor 91 reading and executing the program stored in the memory 92. That is, the processing circuit includes a memory 92 for storing a program that sequentially executes processing of each component of the automatic wire connection device 1000. Further, it can be said that these programs cause the 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 unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like. Further, the memory 92 includes, for example, non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM). Semiconductor memory, magnetic disk, optical disk, compact disk, DVD (Digital Versatile Disc), etc.

When the processing circuit is composed of dedicated hardware, the processing circuit may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field Programmable Gate). Array), or a combination of these. Each function of each component of the automatic wire connecting device 1000 may be realized by a processing circuit for each function, or each function may be collectively realized by a processing circuit.

It should be noted that, for each function of each component of the automatic wire connection device 1000, a part may be realized by dedicated hardware and a part may be realized by software or firmware. As described above, the processing circuit can realize each of the above-mentioned functions by the dedicated hardware, software, firmware, or a combination thereof.

As described above, according to the present embodiment, when the automatic wire connection device 1000 starts automatic connection, a gap is formed between the pair of wire recovery rollers 501 and the wire is fed by the wire feeding roller 3. The coming wire electrode 20 is sucked together with the fluid from the wire discharge side of the wire recovery unit 500. After sucking the wire electrode 20 to the suction unit 100, the pair of wire recovery rollers 501 are closed to sandwich the wire electrode 20, and the automatic connection is completed. Further, during the electric discharge machining, while the pair of wire collecting rollers 501 are closed and the wire collecting unit 500 collects the wire electrode 20, the wire electrode 20 sent by the wire feeding roller 3 is collected by the wire collecting unit. It is sucked together with the fluid from the wire discharge side of 500. As a result, during automatic wiring, automatic wiring can be reliably performed while preventing the wire electrode 20 from being wound around the wire recovery rollers 501a and 501b. Further, it is possible to prevent the wire electrode 20 from being wound around the wire recovery rollers 501a and 501b even during processing after the automatic connection.

Embodiment 2.
In the first embodiment, the tip position of the wire electrode 20 is estimated by calculating the feed amount of the wire electrode 20 from the diameter of the wire feed roller 3 and the rotation speed of the wire feed motor 4, and reaches the suction unit 100. If there is an estimation error, the wire electrode 20 is closed and moved to a position where the pair of wire recovery rollers 501 are in contact with each other even though the tip position of the wire electrode 20 has not reached the suction portion 100. There is a risk that the automatic connection will fail. In the second embodiment, a method of detecting the tip position of the wire electrode 20 by a sensor instead of estimating it and surely determining whether or not the wire electrode 20 has reached the suction portion 100 will be described. The same parts as those of the first embodiment will be omitted, and the parts different from the first embodiment will be described.

FIG. 9 is a configuration diagram of the wire electric discharge machine according to the second embodiment. Of these, in the automatic wire connection device 1001, a photoelectric sensor, which is a detection unit 40 that detects the tip of the wire electrode 20, is installed on the wire discharge side of the suction unit 100. The detection unit 40 outputs the detection result to the arrival determination unit 601 that determines whether the position of the tip of the wire electrode 20 has reached the suction unit 100.

FIG. 10 schematically shows the periphery of the wire collecting portion of the automatic wire connecting device 1001 according to the second embodiment. The detection unit 40 is installed so that the outlet on the wire discharge side of the through hole 102 is included in the detection range 41 of the detection unit 40, and the tip of the wire electrode 20 discharged from the wire discharge side of the through hole 102 is the detection range 41. When passing through, the tip of the wire electrode 20 is detected. When the detection unit 40 detects the tip of the wire electrode 20, the arrival determination unit 601 determines that the tip position of the wire electrode 20 has reached the suction unit 100. While the detection unit 40 does not detect the tip of the wire electrode 20, it is determined that the tip position of the wire electrode 20 has not reached the suction unit 100. When the arrival determination unit 601 determines that the tip position of the wire electrode 20 has reached the suction unit 100, the control unit 300 controls the drive unit 400 so as to close and move to a position where the pair of wire recovery rollers 501 are in contact with each other. To do. After that, the same processing as in the first embodiment is carried out. In the second embodiment, the case where a photoelectric sensor is used as the detection unit 40 is described as an example, but a contact sensor, a vision sensor, and the like can be considered in addition to the photoelectric sensor, and the above is not limited to the above.

As described above, according to the present embodiment, by detecting the tip of the wire electrode 20 with a sensor, it becomes possible to reliably determine whether the wire electrode 20 has reached the suction portion 100. The success rate of automatic wiring can be increased.

Embodiment 3.
In the first embodiment, a method of moving the wire recovery roller to the drive unit 400 by using the air cylinder 401 has been described. In the third embodiment, a method of moving the wire recovery roller to the drive unit 410 by using the servomotor 412 will be described. The same parts as those of the first embodiment will be omitted, and the parts different from the first embodiment will be described.

FIG. 11 is a block diagram of the wire electric discharge machine according to the third embodiment of the present invention. Of these, in the automatic wire connection device 1002, the size of the gap between the drive unit 410 that opens and closes and moves the pair of wire recovery rollers 501 and the pair of wire recovery rollers 501, that is, the opening and closing movement range of the pair of wire recovery rollers 501 is determined. It is provided with a setting unit 700 for setting. The setting unit 700 outputs the set open / close movement range to the control unit 301. When the setting unit 700 receives an input of the opening / closing movement range, the setting unit 700 sets the input value as the opening / closing movement range and outputs the input value to the control unit 301. If the setting unit 700 does not input the opening / closing movement range, the setting unit 700 calculates the optimum opening / closing movement range based on the wire electrode diameter input from the operator before performing automatic wiring or machining, and opens / closes the calculated value. It is set as a movement range and output to the control unit 301.

FIG. 12 is a diagram schematically showing the periphery of the wire collecting portion of the automatic wire connecting device 1002 according to the third embodiment. The drive unit 410 includes a servomotor 412, a rack and pinion 411 composed of a rack 411a having teeth attached to a flat plate-shaped rod, and a pinion 411b of a circular gear. The control unit 301 sets the size of the gap between the wire recovery rollers 501a and 501b based on the position information read from the encoder provided in the servomotor 412 and the open / close movement range set by the setting unit 700. The current supplied to the servomotor 412 is adjusted and feedback controlled so as to be equal to the open / close movement range. In the first embodiment, the size of the gap generated between the pair of wire recovery rollers 501 is adjusted by the stopper 10 that mechanically limits the opening / closing movement range of the pair of wire recovery rollers 501. Then, since the size of the gap generated between the pair of wire recovery rollers 501 is set by the setting unit 700, the stopper 10 becomes unnecessary.

As described above, according to the present embodiment, the pair of wire recovery rollers 501 are opened and closed based on the position information of the encoder provided in the servomotor 412 and the open / close movement range set by the setting unit 700. By controlling the drive unit 410 so as to cause the gap, the size of the gap can be adjusted with high accuracy, and the suction force can be adjusted with high accuracy. In addition, the size of the gap can be easily changed, and the suction force can be easily adjusted.

Embodiment 4.
In the first embodiment, the wire electrode 20 is sucked from the wire discharge side of the wire recovery unit 500 to prevent the wire electrode 20 from being wound around the wire recovery rollers 501a and 501b. In the fourth embodiment, a method of further increasing the suction force to enhance the effect of preventing the wire electrode 20 from winding around the wire recovery rollers 501a and 501b will be described. The same parts as those of the first embodiment will be omitted, and the parts different from the first embodiment will be described.

FIG. 13 is a perspective view showing a configuration example around the suction portion and the wire recovery portion of the automatic wire connection device 1003 according to the fourth embodiment. As shown in FIG. 10, side covers 30a and 30b are installed from both side surfaces of the wire recovery rollers 501a and 501b having rotation shafts so as to cover the gap generated when the wire recovery rollers 501a and 501b are opened. The size of the side covers 30a and 30b may be at least large enough to cover the gap generated when the wire recovery rollers 501a and 501b are opened. With such a configuration, by limiting the direction of the fluid flowing between the wire recovery rollers 501a and 501b, the fluid can be concentrated in the gap portion generated when the wire recovery rollers 501a and 501b are opened, and the suction force can be enhanced. it can.

As described above, according to the present embodiment, the side covers are installed so as to cover the gap generated between the pair of wire recovery rollers 501 from both side surfaces having the rotation shafts of the pair of wire recovery rollers 501, and the pair. By limiting the direction of the fluid flowing between the wire recovery rollers 501, it is possible to increase the suction force.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and has a configuration within a range that does not deviate from the gist of the present invention. It is also possible to omit or change a part.

1 wire bobbin, 2a, 2b pulley, 3 wire feeding roller, 4 wire feeding motor, 5a, 5b feeding pinch roller, 6a wire guide upper part, 6b wire guide lower part, 7 lower roller, 8 pipes, 9 recovery nozzle, 10 Stopper, 11a, 11b power supply, 20 wire electrode, 21 workpiece, 22 workpiece mounting platen, 23 machining tank, 24 machining fluid, 30a, 30b side cover, 40 detector, 41 detection range of detector, 91 processor, 92 memory, 100,200 suction part, 101a, 101b, 203 compression fluid inlet, 102,204 through hole, 103a, 103b, 205a, 205b curved surface, 201 wire insertion side suction part, 202 wire discharge side suction part , 300,301 Control, 400, 410 Drive, 401 Air Cylinder, 402 Hook, 403 Rod, 411 Rack and Pinion, 411a Rack, 411b Pinion, 412 Servo Motor, 500 Wire Recovery, 501 Pair of Wire Recovery Rollers, 501a, 501b Wire recovery roller, 502 wire recovery motor, 503 recovery roller housing, 600,601 arrival judgment unit, 700 setting unit, 1000,1001,1002,1003 wire automatic connection device.

In order to solve the above-mentioned problems and achieve the object, the automatic wire connection device of the wire discharge processing device of the present invention inserts a wire electrode that has passed through a region for discharging a workpiece between a pair of wire recovery rollers. A wire recovery unit that sandwiches and discharges, a drive unit that moves the pair of wire collection rollers to open and close, and a wire feed motor that drives the wire feed rollers in the feed direction of the wire electrodes. And the suction part that sucks and discharges the wire electrode together with the fluid from the wire discharge side of the wire collection part, the control of opening and closing movement by the drive part, the control of the suction operation by the suction part, and the sending operation of the wire electrode by the wire feeding motor. It is provided with a control unit for controlling the above. At the start of automatic wire connection of the wire electrode, the control unit opens and closes the pair of wire collection rollers by opening and closing, and then the wire electrode is operated by the suction operation of the suction unit before the tip of the wire electrode reaches the wire collection unit. both aspirate, performs control so as to start the feeding of the wire electrode, at the time of reaching the suction of the tip of the wire electrode, performs control so as to perform closing movement for closing the pair of wire collecting roller by the opening and closing movement It is characterized by that.

Claims (9)

A wire recovery unit that inserts and sandwiches a wire electrode that has passed through an area for electric discharge machining between a pair of wire recovery rollers and discharges the work piece.
A drive unit that causes the pair of wire recovery rollers to open and close, which is a movement that opens and closes.
A wire feeding motor that drives the wire feeding roller in the feeding direction of the wire electrode, and
A suction unit that sucks and discharges the wire electrode together with the fluid from the wire discharge side of the wire recovery unit,
A control unit that controls the opening / closing movement by the drive unit, control of the suction operation by the suction unit, and control of the wire electrode feeding operation by the wire feeding motor.
With
The control unit
When the automatic connection of the wire electrodes is started, the pair of wire recovery rollers are opened by the opening / closing movement, and then the wire electrodes are sucked by the suction operation of the suction unit and the wire electrodes are started to be sent out. Control to do
An automatic wire connection device for a wire electric discharge machine, characterized in that when the tip of the wire electrode reaches the suction portion, control is performed so as to perform a closing movement of closing the pair of wire collecting rollers by the opening / closing movement. The suction part is
A through hole for passing the wire electrode together with the fluid is provided.
The control unit
The automatic wire connection device for a wire electric discharge machine according to claim 1, wherein the opening / closing movement is controlled so that the opening / closing movement range of the pair of wire recovery rollers is narrower than the diameter of the through hole. .. A arrival determination unit that determines whether the position of the tip of the wire electrode has reached the suction unit, and
Further prepare
The control unit controls the drive unit to perform the closed movement when it is determined that the tip of the wire electrode has reached the suction unit based on the determination result of the arrival determination unit. The automatic wire connection device for the wire electric discharge machine according to claim 1 to 2, wherein the wire is automatically connected. The arrival determination unit
It is characterized in that the feeding amount of the wire electrode is calculated from the diameter of the wire feeding roller and the rotation speed of the wire feeding motor, and it is determined whether or not the position of the tip of the wire electrode reaches the suction portion. The automatic wire connection device for the wire electric discharge machining device according to claim 3. A detection unit that detects the tip of the wire electrode on the wire discharge side of the suction unit,
Further prepare
The arrival determination unit
The wire of the wire electric discharge machine according to claim 3, wherein when the detection unit detects the tip of the wire electrode, it is determined that the position of the tip of the wire electrode has reached the suction unit. Automatic wire connection device. A stopper that mechanically limits the opening / closing movement range of the pair of wire recovery rollers,
Further prepare
The drive unit
By driving the air cylinder, the opening and closing movement is performed.
The control unit
The automatic wire connection device for a wire electric discharge machine according to claim 1 to 5, wherein the drive unit is controlled so that the open movement is performed until the open movement is restricted by the stopper. A setting unit that sets the opening / closing movement range of the pair of wire recovery rollers, and
Further prepare
The drive unit
By driving the servo motor, the opening and closing movement is performed.
The control unit
The wire electric discharge according to claim 1 to 5, wherein the drive unit is controlled so as to perform the open / close movement based on the position information of the encoder provided in the servomotor and the open / close movement range. Automatic wire connection device for machining equipment. The setting unit
The automatic wire connection device for a wire electric discharge machine according to claim 7, wherein the opening / closing movement range is set based on the wire electrode diameter. It is installed so as to cover the gap generated between the pair of wire recovery rollers by the opening movement from both side surfaces of the pair of wire recovery rollers having the rotation axes, and the direction of the fluid flowing between the pair of wire recovery rollers can be determined. With the side cover to limit,
The automatic wire connection device for the wire electric discharge machine according to claim 1 to 8, further comprising.

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