JP6316603B2 - Processing equipment - Google Patents

Description

  The present invention relates to a processing apparatus such as an electric arc spraying apparatus using a wire.

  Examples of a processing apparatus that performs processing by sequentially supplying wires to a processing target include an electric arc spraying apparatus or an arc welding apparatus. Patent Document 1 discloses an example of a conventional electric arc type thermal spraying apparatus. This electric arc type thermal spraying apparatus feeds two wires to a spray gun and generates an arc at the tips of these two wires. The ends of the two wires are melted by this arc, and the molten metal is sprayed onto the object to be processed by the discharge gas. Thus, thermal spraying can be performed on the processing target.

  The electric arc spraying device described above has a first drive unit and a second drive unit as means for feeding the wire. The first drive unit and the second drive unit are disposed at different positions in the wire feeding direction, and each applies a feeding force to the wire. With such a configuration, it is possible to more reliably feed the wire at a higher speed.

  However, since the feeding force is applied to the one wire from two locations of the first driving unit and the second driving unit, the feeding force application between the first driving unit and the second driving unit is appropriately controlled. There is a need to. If the feeding force between the first drive unit and the second drive unit is unbalanced, the wire may buckle or the wire may be cut. In addition, a processing apparatus typified by an electric arc type thermal spraying apparatus is required to have a suitable shape and size depending on the processing target and the place where the processing target is placed. Therefore, in taking measures to avoid the above situation, it is possible to avoid redundancy of the device configuration as much as possible, for example, the mechanism becomes excessively complicated or an unreasonably large part is required. preferable.

Japanese Patent Publication No. 3-5222

  The present invention has been conceived under the circumstances described above, and it is an object of the present invention to provide a processing apparatus capable of smoothly feeding a wire while avoiding redundancy of the apparatus configuration. And

  A processing apparatus provided by the present invention is a processing apparatus that performs processing by sequentially supplying wires to a processing target, and includes a first drive unit that sends out the wires, and the first drive unit in the longitudinal direction of the wires. A second drive unit that feeds the wire at a position different from the drive unit, and a process that is located downstream of the first drive unit and the second drive unit in the feed direction and that uses the wire. A head, and a controller that outputs a first delivery speed command to the first drive unit and a second delivery speed command of the second drive unit, wherein the second drive unit includes a drive motor, A drive roller that transmits the power output to the wire, and is interposed between the drive motor and the drive roller, and allows a difference in rotational speed between the drive motor and the drive roller. And a torque transmission coupling for transmitting torque, and the speed of the second delivery speed command is always higher than the speed of the first delivery speed command, and based on the speed of the first delivery command. It is characterized by being variable.

  In a preferred embodiment of the present invention, the torque transmission further includes a guide tube positioned between the machining head and the first drive or the second drive unit and guiding the wire to be fed out. The coupling is set such that the maximum torque that can be transmitted does not exceed the torque corresponding to the frictional resistance force applied to the wire by the guide tube.

  In a preferred embodiment of the present invention, the torque transmission coupling is set such that the maximum torque that can be transmitted is equal to the torque corresponding to the frictional resistance force applied to the wire by the guide tube. .

  In a preferred embodiment of the present invention, the speed of the second delivery speed command continuously increases in accordance with the increase of the speed of the first delivery speed command.

  In a preferred embodiment of the present invention, the speed of the second delivery speed command increases stepwise as the speed of the first delivery speed command increases.

  In a preferred embodiment of the present invention, the second drive unit is arranged upstream of the first drive unit in the wire feeding direction.

  In a preferred embodiment of the present invention, the machining head has two electrodes that contact the two wires to be fed out, and a voltage is applied through the electrodes so as to be between the tips of the two wires. A spray gun that blows molten metal obtained by generating an arc and melting the tips of the two wires onto a workpiece, and the first drive unit is housed in the machining head The two wires are collectively fed based on the first delivery speed command, and are configured as an electric arc type thermal spraying device including two second drive units provided separately on the two wires. ing.

  In a preferred embodiment of the present invention, the torque transmission coupling includes a magnetic disk integrally attached to an outer periphery of an output shaft of the drive motor, and a magnetic disk disposed on both sides of the magnetic disk. A pair of ring-shaped permanent magnets opposed to the disk via a gap, and a case which supports these ring-shaped permanent magnets on the inner surface and is rotatably supported by the output shaft of the drive motor via a bearing; A rotating shaft fixed to the case opposite to the output shaft and connected to the driving roller, and the pair of ring-shaped permanent magnets have different magnetic poles in the circumferential direction. Magnetized.

  If the second delivery speed is a fixed value, it is necessary to set the second delivery speed to a speed that exceeds the assumed maximum speed of the first delivery speed. In this case, the difference between the first delivery speed and the second delivery speed increases as the actual first delivery speed decreases from the maximum speed. That is, the rotational speed difference in the torque transmission coupling increases. In the torque transmission coupling, heat may be generated according to this rotational speed difference. As the speed range of the first delivery speed becomes wider due to the diversification of machining objects and machining conditions, it is assumed that the second delivery speed has to be set to a higher speed, and heat generation in the torque transmission coupling increases. Is done. For this reason, when selecting the torque transmission coupling, it is necessary to select the torque transmission coupling having specifications that can withstand greater heat generation. This makes the apparatus mechanism of the processing apparatus redundant.

  On the other hand, according to the present invention, the second delivery speed is variable according to the first delivery speed. For this reason, it is not always necessary to make the second delivery speed larger than the assumed maximum speed of the first delivery speed, and is larger than the first delivery speed in accordance with the actual first delivery speed. It can be appropriately set to a desired value. As a result, even if the speed range of the first delivery speed is widened, the speed difference between the first delivery speed and the second delivery speed is prevented from becoming unnecessarily large, and the rotational speed in the torque transmission coupling is avoided. The difference can be reduced. For this reason, it is not necessary to select the torque transmission coupling having a specification capable of withstanding excessive heat generation. Therefore, the wire can be smoothly fed while avoiding the redundancy of the device mechanism of the processing device.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a whole perspective view showing an example of an electric arc type thermal spraying device concerning the present invention. It is a system block diagram which shows the electric arc type thermal spraying apparatus of FIG. It is sectional drawing which shows the torque transmission coupling of the electric arc type thermal spray apparatus of FIG. It is a perspective view which shows the internal structure of the torque transmission coupling of FIG. It is a graph which shows an example of the relationship of the 1st delivery speed command and the 2nd delivery speed command in the electric arc type thermal spraying apparatus of FIG. It is a graph which shows the other example of the relationship between the 1st delivery speed command and the 2nd delivery speed command in the electric arc type thermal spraying apparatus of FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 and 2 show an example of an electric arc type thermal spraying apparatus according to the present invention. The electric arc type thermal spraying apparatus A of this embodiment includes a wire feeding device 2, 2 ′, a thermal spray gun 4, a second drive unit 6, 6 ′, two guide tubes 7, 7 ′, a control unit 41, and a power supply unit. 42 and the gas supply part 43, it is an apparatus which performs a thermal spraying process by spraying the molten metal obtained by fuse | melting two wires 1 and 1 'toward a process target. The electric arc type thermal spraying apparatus A is an example of a processing apparatus referred to in the present invention. Moreover, in FIG. 1, the control part 41, the power supply part 42, and the gas supply part 43 are abbreviate | omitted for convenience of understanding.

  In the present embodiment, there is a case in which two elements having the same configuration are provided in response to feeding the two wires 1 and 1 ′. For the sake of convenience, these will be described as “wire feeding devices 2 and 2 ′” instead of “wire feeding device 2 and wire feeding device 2 ′”, for example.

  The wire feeding devices 2 and 2 ′ are devices corresponding to the two wires 1 and 1 ′ and feed the stored wires 1 and 1 ′. The wire feeders 2 and 2 'are provided with containers 8 and 8', stands 9 and 9 ', and guide rollers 10 and 10'. The containers 8 and 8 'contain the wires 1 and 1' wound in a coil shape. The stands 9 and 9 'rotatably support the guide rollers 10 and 10'. The guide rollers 10 and 10 ′ guide the wires 1 and 1 ′ fed from the containers 8 and 8 ′ immediately above the containers 8 and 8 ′ to a predetermined track. The guide rollers 11 and 11 'guide the wires 1 and 1' to a predetermined track on the downstream side of the guide rollers 10 and 10 '.

  The thermal spray gun 4 is an example of a processing head referred to in the present invention, and is a part for spraying molten metal to a processing target. The thermal spray gun 4 includes a housing 12, electrodes 3, 3 ′ and a first drive unit 5. The thermal spray gun 4 includes a nozzle (not shown) that ejects the gas sent from the gas supply unit 43. The housing 12 is made of metal, for example, and may be water-cooled at an appropriate place as necessary. The housing 12 accommodates the electrodes 3, 3 ′ and the first drive unit 5. The electrodes 3 and 3 ′ are arranged on the distal end side (downstream side) of the housing 12 and are in contact with the wires 1 and 1 ′ while sliding. Power is supplied to the electrodes 3 and 3 ′ from the power supply unit 42.

  The first drive unit 5 feeds the wires 1 and 1 ′ to the electrodes 3 and 3 ′ at a constant speed, and includes drive rollers 13 and 13 ′, driven rollers 14 and 14 ′, a first drive motor 15, and torque transmission. A mechanism 16 is provided. The driving rollers 13 and 13 'and the driven rollers 14 and 14' sandwich the wires 1 and 1 'and are portions that apply a feeding force to the wires 1 and 1'. The first drive motor 15 is a drive source that generates torque serving as a feeding force applied to the wires 1 and 1 ′. The torque transmission mechanism 16 transmits the torque of the first drive motor 15 to the drive roller 13 '. The torque transmission mechanism 16 includes, for example, pulleys attached to the shaft of the driving roller 13 and the shaft of the driving roller 13 ′, and a belt wound around these pulleys.

  The guide tubes 7 and 7 ′ guide the wires 1 and 1 ′ between the thermal spray gun 4 and the second driving units 6 and 6 ′. In particular, in the present embodiment, the second drive units 6 and 6 ′ are fixed to a floor surface or a wall surface at a processing location, and a configuration in which the spray gun 4 moves freely according to the spray processing is intended. ing. The guide tubes 7 and 7 ′ are freely deformed in accordance with the spray gun 4 that moves freely with respect to the second drive units 6 and 6 ′ and guide the wires 1 and 1 ′. Such guide tubes 7 and 7 'are formed using a flexible synthetic resin such as a tetraethylene tube. In such a configuration, the wires 1 and 1 ′ are fed through the internal space of the guide tubes 7 and 7 ′ and appropriately slide on a part of the inner surfaces of the guide tubes 7 and 7 ′.

  The second drive unit 6, 6 ′ feeds the wires 1, 1 ′ by the frictional resistance mainly due to the sliding between the guide tubes 7, 7 ′ and the wires 1, 1 ′ in the path to the spray gun 4. In order to prevent the wire 1 from being disturbed, a feeding force is applied to the wires 1 and 1 ′. The second drive units 6, 6 'include drive rollers 17, 17', driven rollers 18, 18 ', a second drive motor 19, and torque transmission couplings 20, 20'. The driving rollers 17 and 17 ′ and the driven rollers 18 and 18 ′ sandwich the wires 1 and 1 ′ and are portions that apply a feeding force to the wires 1 and 1 ′. The second drive motors 19 and 19 ′ are drive sources that generate torque serving as a feeding force applied to the wires 1 and 1 ′.

  The torque transmission couplings 20 and 20 ′ are interposed between the drive rollers 17 and 17 ′ and the second drive motors 19 and 19 ′, and the drive rollers 17 and 17 ′ and the second drive motors 19 and 19 ′. Torque is transmitted from the second drive motors 19 and 19 ′ to the drive rollers 17 and 17 ′ while allowing the difference in rotational speed to occur. In the present embodiment, so-called magnetic couplings are employed as the torque transmission couplings 20 and 20 '.

  The drive rollers 17 and 17 ′ and the driven rollers 18 and 18 ′ are intended to rotate without sliding with respect to the wires 1 and 1 ′, and the drive rollers 17 and 17 ′ and the driven rollers 18 and 18 ′ It rotates so that it may become the feeding speed equal to the feeding speed in the one drive part 5. FIG. On the other hand, the second drive motors 19 and 19 ′ connected to the drive rollers 17 and 17 ′ via the torque transmission couplings 20 and 20 ′ rotate at a speed equal to the feeding speed in the first drive unit 5. It does not always rotate by a number, but rotates at a rotational speed equal to or exceeding this rotational speed.

  3 and 4 show a torque transmission coupling 20 configured as a magnetic coupling. In the present embodiment, the torque transmission coupling 20 and the torque transmission coupling 20 ′ have the same configuration, and the configuration of the torque transmission coupling 20 will be described below as an example. The torque transmission coupling 20 includes a magnetic disk 22, ring-shaped permanent magnets 25 and 26, and a case 28.

  The magnetic disk 22 is fixed to the output shaft 21 of the second drive motor 19. The magnetic disk 22 is a disk made of a magnetic material such as iron. The ring-shaped permanent magnets 25 and 26 are arranged in parallel to the magnetic disk 22 with gaps 23 and 24 having the same dimensions. As shown in FIG. 4, the ring-shaped permanent magnets 25 and 26 are magnetized so that different magnetic poles exist in the circumferential direction. In this figure, the ring-shaped permanent magnet 25 and the ring-shaped permanent magnet 26 are arranged so that the polarities of the portions having the same circumferential position are the same. The ring-shaped permanent magnets 25 and 26 are configured such that one of them can be adjusted to rotate in the circumferential direction in order to change the mutual magnetic coupling force that determines the maximum torque that can be transmitted by the torque transmission coupling 20. ing.

  The case 28 contains the magnetic disk 22 and the ring-shaped permanent magnets 25 and 26. The ring-shaped permanent magnets 25 and 26 are fixed to the case 28. On the other hand, the magnetic disk 22 is not fixed to the case 28 and is disposed with a gap between the magnetic disk 22 and the inner surface of the case 28 in the present embodiment. The case 28 is fixed to the rotary shaft 30 of the drive roller 17 via a flange 29. The case 28 is rotatable with respect to the output shaft 21 of the second drive motors 19 and 19 ′ by two bearings 27. With such a configuration, in the torque transmission coupling 20, the magnetic disk 22 rotates together with the output shaft 21 of the second drive motors 19 and 19 ′, and the ring-shaped permanent magnets 25 and 26 rotate on the rotation shaft 30 of the drive roller 17. Rotate with.

  In the torque transmission coupling 20 having such a configuration, the magnetic lines of force of the ring-shaped permanent magnets 25 and 26 cross the magnetic disk 22. When the magnetic disk 22 is rotated by the second drive motor 19, an eddy current is generated in the magnetic disk 22 that generates a Lorentz force in a direction that prevents this rotation. The force that prevents the magnetic disk 22 from rotating is converted into torque transmitted by the torque transmission coupling 20. The magnitude of this torque is determined by the circumferential positions of the magnetic poles of the ring-shaped permanent magnet 25 and the ring-shaped permanent magnet 26. In the case where the magnetic disk 22 is made of a magnetic material having a hysteresis characteristic, the magnetic field is changed by rotating one of the ring-shaped permanent magnets 25 and 26 in the circumferential direction with an adjustment knob (not shown). The magnitude of the torque can be adjusted. Therefore, the torque transmission coupling 20 of this embodiment is always constant regardless of the rotational speed difference between the second drive motor 19 and the drive roller 17 when the circumferential positional relationship between the ring-shaped permanent magnets 25 and 26 is determined. Torque is obtained. That is, the torque transmitted by the torque transmission coupling 20 is kept constant even if the rotational speed of the driving roller 17 changes, although it depends somewhat on the temperature.

  In the present embodiment, the magnitude of the torque transmitted by the torque transmission couplings 20 and 20 ′ corresponds to the frictional resistance force applied to the wires 1 and 1 ′ by sliding with the guide tubes 7 and 7 ′. It is set to a value that does not exceed the torque. More preferably, the magnitude of the torque transmitted by the torque transmission couplings 20 and 20 ′ is equal to the torque corresponding to the frictional resistance force applied to the wires 1 and 1 ′ by sliding with the guide tubes 7 and 7 ′. Set to size. The resistance force applied to the wires 1 and 1 ′ is, for example, the containers 8 and 8 ′, the guide rollers 10 and 10 ′, the guide rollers 11 and 11 ′, and the like in addition to the frictional resistance force by the guide tubes 7 and 7 ′. Can occur in the entire feeding path of the wires 1, 1 ′. The setting example described above is particularly effective when most of the resistance force applied to the wires 1 and 1 ′ is regarded as the friction resistance force by the guide tubes 7 and 7 ′. On the other hand, when the resistance force other than the frictional resistance force by the guide tubes 7 and 7 ′ is a magnitude that cannot be ignored, torque transmission is performed based on the resistance force that can be generated in the entire feeding path of the wires 1 and 1 ′. It is preferable to set the magnitude of the torque transmitted by the coupling 20, 20 ′.

  As shown in FIG. 2, the control unit 41 controls the first drive motor 15, the second drive motors 19, 19 ′, and the gas supply unit 43, and may also serve as control of the power supply unit 42. The control unit 41 sends a first delivery speed command Sfw1 to the first drive motor 15, and sends a second delivery speed command Sfw2 to the second drive motors 19 and 19 '. The first delivery speed command Sfw1 is a command for rotating the first drive motor 15 at a rotational speed equivalent to feeding the wires 1 and 1 'at the first delivery speed Fw1. In the present embodiment, the speed of the first drive motor 15 is controlled by, for example, servo control. The second delivery speed command Sfw2 is generated when the second drive motors 19 and 19 ′ and the drive rollers 17 and 17 ′ are directly connected without passing through the torque transmission couplings 20 and 20 ′. Is a command to rotate the second drive motors 19 and 19 ′ at a rotational speed corresponding to feeding at a second delivery speed Fw2. As described above, the torque transmission couplings 20 and 20 ′ are allowed to generate a rotational speed difference, so that the drive rollers 17 and 17 ′ do not always feed the wires 1 and 1 ′ at the second delivery speed Fw2. . In the present embodiment, the second drive motors 19 and 19 'are speed-controlled by, for example, servo control, but other control methods may be used. In the following description, an example in which the same second delivery speed command Sfw2 is sent to the second drive motors 19 and 19 ′ will be described. However, the second delivery speed command Sfw2 to the second drive motor 19 The second delivery speed command Sfw2 to the two-drive motor 19 ′ may be set differently.

  FIG. 5 shows a setting example of the first delivery speed Fw1 and the second delivery speed Fw2 by the first delivery speed command Sfw1 and the second delivery speed command Sfw2. In this example, the second delivery speed Fw2 is always higher than the first delivery speed Fw1, and continuously increases as the second delivery speed Fw2 increases. Specifically, the second delivery speed Fw2 is set to a speed obtained by adding a speed α corresponding to a certain margin to the first delivery speed Fw1. The magnitude of the speed α is appropriately set. For example, when the rotation speed corresponding to the first delivery speed Fw1 is about 300 rpm to 500 rpm at the maximum, more typically about 400 rpm, the speed corresponding to 10 rpm is set to the speed α. Set as. Instead of adding the constant speed α, for example, the second delivery speed Fw2 may be set to a speed obtained by multiplying the first delivery speed Fw1 by a constant ratio exceeding 1, for example.

  The gas supply unit 43 shown in FIG. 2 includes a pressurizing source such as a compressor or a cylinder and a control means such as a valve, and directs a gas such as air toward the object to be processed through the nozzle (not shown) of the spray gun 4. Discharge. The control unit 41 may control gas discharge ON / OFF by the gas supply unit 43 and may further control the discharge amount and the like.

  The power supply 42 is for supplying power to the electrodes 3 and 3 ′. In the present embodiment, the power supply unit 42 controls at least one of power supply ON / OFF to the electrodes 3 and 3 ′ and its voltage and current based on a command from the control unit 41.

  Based on the first delivery speed command Sfw1 and the second delivery speed command Sfw2 of the control unit 41, the wires 1, 1 'are fed from the power source 42 by the first drive unit 5 and the second drive units 6, 6'. By supplying power to the electrodes 3 and 3 ', an arc is generated between the tips of the wires 1 and 1'. The tips of the wires 1 and 1 ′ are melted by the heat of the arc and become molten metal. At the same time, the gas is discharged from the gas supply unit 43 through the nozzle of the thermal spray gun 4 according to a command from the control unit 41. The molten metal is sprayed onto the object to be processed by discharging the gas. While performing this operation continuously, the thermal spraying process can be performed on the processing target by appropriately moving the spray gun 4 toward the processing target.

  Next, the operation of the processing apparatus A will be described.

  In order to transmit the torque by the torque transmission couplings 20 and 20 ′ of the above-described operation principle, the second delivery speed Fw2 with respect to the first delivery speed Fw1 that is the speed at which the wires 1 and 1 ′ are actually fed. Must be set to a faster speed. If the second delivery speed Fw2 is a fixed value, it is necessary to set the second delivery speed Fw2 to a speed that exceeds the assumed maximum speed of the first delivery speed Fw1. In this case, the difference between the first delivery speed Fw1 and the second delivery speed Fw2 increases as the actual first delivery speed Fw1 decreases from the maximum speed. That is, the rotational speed difference between the drive roller 17 and the second drive motor 19 in the torque transmission couplings 20 and 20 ′ increases. In the torque transmission couplings 20 and 20 ', although this rotational speed difference is allowed, heat generation occurs according to the rotational speed difference in accordance with the principle described above. As the speed range of the first delivery speed Fw1 becomes wider due to the diversification of machining objects and machining conditions, the second delivery speed Fw2 must be set to a higher speed, and the heat generation in the torque transmission couplings 20 and 20 ′ increases. It is assumed that For this reason, when selecting the torque transmission couplings 20 and 20 ′, it is necessary to select the torque transmission couplings 20 and 20 ′ having specifications that can withstand greater heat generation. This makes the apparatus mechanism of the electric arc type thermal spraying apparatus A redundant.

  On the other hand, according to the present embodiment, the second delivery speed Fw2 is variable according to the first delivery speed Fw1. For this reason, the second delivery speed Fw2 does not always have to be larger than the assumed maximum speed of the first delivery speed Fw1, and is larger than the first delivery speed Fw1 according to the actual first delivery speed Fw1. It can be appropriately set to a desired value. As a result, even if the speed range of the first delivery speed Fw1 is widened, it is avoided that the speed difference between the first delivery speed Fw1 and the second delivery speed Fw2 becomes unnecessarily large, and the torque transmission couplings 20, 20 ′. The rotational speed difference at can be reduced. For this reason, it is not necessary to select the torque transmission couplings 20 and 20 'having specifications that can withstand excessive heat generation. Therefore, it is possible to smoothly feed the wires 1 and 1 ′ while avoiding the redundancy of the apparatus mechanism of the electric arc type thermal spraying apparatus A.

  Further, in the present embodiment, as shown in FIG. 5, the second delivery speed Fw2 is set to a value obtained by adding a constant speed α to the first delivery speed Fw1. Therefore, the speed difference between the first delivery speed Fw1 and the second delivery speed Fw2 is always constant, and the rotational speed difference generated in the torque transmission couplings 20 and 20 ′ is also constant. The calorific value is almost constant. Thereby, the calorific value which should be considered in selection of torque transmission coupling 20 and 20 'can be estimated smaller. Therefore, it is possible to more reliably prevent the apparatus mechanism of the electric arc type thermal spraying apparatus A from becoming redundant.

  Further, when the first delivery speed Fw1 is 0, the second delivery speed Fw2 is set to a value exceeding 0. This means that the second drive motors 19 and 19 'start rotating prior to the start of feeding the wires 1 and 1' when the wires 1 and 1 'are not yet fed. For this reason, it is possible to immediately apply the feeding force to the wires 1 and 1 ′ by the second driving units 6 and 6 ′ from the time when the feeding of the wires 1 and 1 ′ is actually started.

  By setting the torque transmitted by the torque transmission couplings 20 and 20 ′ to a magnitude that does not exceed the torque corresponding to the frictional resistance that can be generated in the guide tubes 7 and 7 ′, the second drive units 6 and 6 ′ It is possible to avoid a situation in which the wires 1 and 1 'are buckled by application of the feeding force. Furthermore, if the torque transmitted by the torque transmission couplings 20 and 20 ′ is equal to the torque corresponding to the frictional resistance force that can be generated in the guide tubes 7 and 7 ′, the expected friction in the guide tubes 7 and 7 ′. It is possible to cancel the resistance. Thereby, it can avoid that the 1st drive part 5 will be in the state which pulled the wires 1 and 1 'too much. As described above, when the resistance force other than the frictional resistance force by the guide tubes 7 and 7 ′ is not negligible, the torque is determined based on the resistance force that can be generated in the entire feeding path of the wires 1 and 1 ′. It is preferable to set the magnitude of the torque transmitted by the transmission coupling 20, 20 ′.

  It is assumed that the guide tubes 7 and 7 ′ provided as two paths corresponding to the wires 1 and 1 ′ have different lengths and bending states depending on a specific path design, a processing posture, and the like. Thus, when the wires 1 and 1 'are fed through the guide tubes 7 and 7' that are different from each other, the frictional resistance generated on the wire 1 in the guide tube 7 and the frictional resistance generated on the wire 1 'in the guide tube 7'. Power can be different from each other. In the present embodiment, the second drive unit 6 feeds only the wire 1 and the second drive unit 6 'feeds only the wire 1'. Therefore, the torque that can be transmitted by the torque transmission coupling 20 and the torque that can be transmitted by the torque transmission coupling 20 ′ can be set separately according to the difference in the state of the guide tubes 7 and 7 ′. . Therefore, the wires 1, 1 'can be fed more smoothly.

  The first drive unit 5 that feeds the wires 1 and 1 ′ in a batch is accommodated in the spray gun 4, and the second drive units 6 and 6 ′ are sandwiched between the guide tubes 7 and 7 ′ on the upstream side of the spray gun 4. By setting it as the structure to arrange | position, it can prevent that the thermal spray gun 4 will enlarge too much. In addition, by adopting a configuration in which the second driving units 6 and 6 ′, which are heavier than the first driving unit 5, are fixed, the apparatus can be simplified and the operation can be further stabilized.

  FIG. 6 shows another setting example of the first delivery speed Fw1 and the second delivery speed Fw2 based on the first delivery speed command Sfw1 and the second delivery speed command Sfw2. In this example, the second delivery speed Fw2 is always higher than the first delivery speed Fw1, and increases stepwise as the second delivery speed Fw2 increases. Specifically, when the second delivery speed Fw2 is set to the same speed as the first delivery speed Fw1, the rotation speed of the second drive motors 19 and 19 ′ becomes 0 to 100 rpm. The second drive motors 19 and 19 ′ are set so that the actual rotational speed of the second drive motors 19 and 19 ′ is 110 rpm, and the second delivery speed Fw2 is set to the same speed as the first delivery speed Fw1. Is set so that the actual rotational speed of the second drive motors 19 and 19 ′ is 210 rpm. Even with such a setting example, it is possible to smoothly feed the wire while avoiding redundancy of the device mechanism of the electric arc type thermal spraying device A.

  The processing apparatus according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the processing apparatus according to the present invention can be changed in various ways.

  The torque transmission coupling referred to in the present invention is not limited to the magnetic coupling described above. For example, a hysteresis clutch, a powder clutch, a fluid coupling, or the like can be used as long as the above-described effects can be achieved. The processing apparatus according to the present invention is not limited to an electric arc type spraying apparatus, and may be any processing apparatus that performs processing by feeding a wire, such as an arc welding apparatus.

A Electric arc type spraying device 1, 1 'wire 2, 2' wire feeding device 3, 3 'electrode 4 spray gun 5 first drive unit 6, 6' second drive unit 7, 7 'guide tube 8, 8' Container 9, 9 'Stand 10, 10' Guide roller 11, 11 'Guide roller 12 Housing 13, 13' Drive roller 14, 14 'Driven roller 15 Drive motor 16 Torque transmission mechanism 17, 17' Drive roller 18, 18 'Driven Roller 19, 19 'Drive motor 20, 20' Torque transmission coupling 21 Output shaft 22 Magnetic disk 23, 24 Gap 25, 26 Ring-shaped permanent magnet 27 Bearing 28 Case 29 Flange 30 Rotating shaft 41 Control unit 42 Power supply unit 43 Gas Supply section

Claims (6)

A processing apparatus that performs processing by sequentially supplying wires to a processing target,
A first drive unit for feeding out the wire;
A second drive unit for feeding out the wire at a position different from the first drive unit in the longitudinal direction of the wire;
A machining head that is located downstream of the first drive unit and the second drive unit in the feeding direction and performs machining using the wire;
A control unit that outputs a first delivery speed command to the first drive unit and a second delivery speed command of the second drive unit, and
The second drive unit is provided between the drive motor, the drive roller that transmits the output power to the wire, and the drive motor and the drive roller, and generates a rotational speed difference between the drive motor and the drive roller. It has a torque transmission coupling that allows and transmits torque,
Speed of the speed of the second feed speed command, the first feeding always speed is faster than the speed of the speed command, and the first feeding variable der Rutotomoni based on the speed command, the first feeding velocity command The processing apparatus is a speed that continuously increases in accordance with the increase in speed and is a speed obtained by adding a constant speed to the speed of the first delivery speed command . A guide tube that is positioned between the processing head and the first drive or the second drive unit and guides the wire to be delivered;
2. The torque transmission coupling according to claim 1, wherein a maximum torque that can be transmitted is set to a magnitude that does not exceed a torque corresponding to a frictional resistance force applied to the wire by the guide tube. Processing equipment.   The processing device according to claim 2, wherein the torque transmission coupling is set such that a maximum torque that can be transmitted is equal to a torque corresponding to a frictional resistance force applied to the wire by the guide tube. Said second driving unit, wherein in the feeding direction of the wire than the first driving unit is disposed on the upstream side, the processing apparatus according to any one of claims 1 to 3. The machining head has electrodes that are in contact with the two wires to be fed out, and an arc is generated between the tips of the two wires by applying a voltage through the electrodes, and the two wires It is a spray gun that sprays molten metal obtained by melting the tip of the wire on the object to be processed,
The first drive unit is housed in the processing head, and sends the two wires together based on the first delivery speed command.
The processing apparatus of Claim 4 comprised as an electric arc type thermal spraying apparatus provided with two said 2nd drive parts each provided in the said two wires separately. The torque transmission coupling is disposed on both sides of the magnetic disk integrally attached to the outer periphery of the output shaft of the drive motor, and is arranged on both sides of the magnetic disk so as to face the magnetic disk via a gap. A pair of ring-shaped permanent magnets, a case that supports these ring-shaped permanent magnets on the inner surface and is rotatably supported by the output shaft of the drive motor via a bearing, and the output shaft with respect to the case And a pair of ring-shaped permanent magnets that are magnetized so that different magnetic poles exist in the circumferential direction. The rotating shaft is fixed to the opposite side and connected to the drive roller. The processing apparatus according to any one of 5 .

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