JP5493484B2 - Thermal spray coating apparatus and wire supply method - Google Patents

Description

  The present invention relates to a thermal spray coating forming apparatus and a wire supply method for forming a thermal spray coating by spraying a molten thermal spray material toward a sprayed object, and more particularly to a wire feeding technique to a contact chip.

  For example, a wire that becomes a thermal spray material is fed to the center of a revolving spray gun in accordance with the progress of thermal spraying, and the plasma generating part sprays plasma toward the wire to melt the wire and form a thermal sprayed metal There has been proposed a thermal spray coating forming apparatus for forming a thermal spray coating by spraying a sprayed material on the object to be sprayed (for example, described in Patent Document 1).

  In the thermal spray coating forming apparatus described in Patent Document 1, a wire to be fed is fed into a wire feeding hole formed in a contact chip (wire electrode), and the wire is applied to an inner wall of the wire feeding hole by a leaf spring. A structure is adopted in which plasma is generated by supplying power to the wire by pressing and contacting.

JP 2003-33877 A

  In the structure described in Patent Document 1, as described above, the wire is pressed against the inner wall of the wire feed hole by a constant spring force of the leaf spring provided inside the contact chip, and the wire is fed with power.

  Therefore, in the structure described in Patent Document 1, since there is only one point of contact with the wire, the power supply state to the wire is likely to be unstable, and the plasma arc is not stable. Further, in this structure, since the wire pressed by the leaf spring is continuously pressed against the inner wall of the wire feed hole, wear tends to progress locally, and the life of the contact tip is shortened.

  Accordingly, the present invention has an object to provide a thermal spray coating forming apparatus and a wire feeding method capable of increasing the number of contacts between a wire and a contact tip, stabilizing the plasma arc, and extending the life of the contact tip. To do.

  The thermal spray coating forming apparatus of the present invention includes a forming means for forming the wire into a repeatedly curved shape and forming the curve so as to contact at least three points or more with the inner wall of the wire feed hole formed in the contact tip.

  In the wire feeding method of the present invention, the wire is formed into a repeated curved shape, and then the curved wire is supplied to the wire feeding hole formed in the contact chip, and the curved portion is the wire feeding hole. At least three points are brought into contact with the inner wall surface.

  According to the thermal spray coating forming apparatus of the present invention, the wire is formed by the forming means so that the wire has a repeatedly curved shape and the curve comes into contact with at least three points on the inner wall of the wire feed hole formed in the contact tip. Then, the number of contact points with the wire in the contact chip increases, a stable power supply state to the wire can be obtained, and the plasma arc can be stabilized.

  On the other hand, according to the power feeding method to the wire of the present invention, the wire is formed into a repeated curved shape, and then the curved wire is supplied to the wire feed hole formed in the contact chip to be curved. Since at least three or more points are brought into contact with the inner wall surface of the wire feed hole, the number of contacts between the wire and the contact tip increases, so that the power supply state to the wire is stabilized and a plasma arc can be stably generated.

  In addition, according to the method of the present invention, since the wire having a curved shape that repeats is fed to the wire feeding hole, local wear caused by continuously pushing the wire against the inner wall of the wire feeding hole by the leaf spring can be suppressed. The life of the contact chip can be extended.

FIG. 1 is an overall view of a thermal spray coating forming apparatus according to a first embodiment. FIG. 2 is a view showing the contact tip of the first embodiment and the tip portion of the spray gun to which the contact tip is attached. FIG. 3 is an exploded perspective view of the contact chip according to the first embodiment. FIG. 4 is a diagram illustrating the wire feeding device according to the first embodiment. FIG. 5 is a diagram illustrating the wire feeding device according to the second embodiment. FIG. 6 is a diagram illustrating the wire feeding device according to the third embodiment. FIG. 7 is a diagram illustrating a wire feeding device according to a fourth embodiment.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“Embodiment 1”
FIG. 1 is an overall view of a thermal spray coating forming apparatus according to the first embodiment, FIG. 2 is a diagram showing a contact tip according to the first embodiment and a tip portion of a thermal spray gun to which the contact tip is attached, and FIG. FIG. 4 and FIG. 4 are views showing the wire feeding device of the first embodiment.

  As shown in FIG. 1, the thermal spray coating forming apparatus 1 includes a thermal spray gun 2 that injects molten metal toward a sprayed object, a wire supply device 4 that supplies a wire 3 to the thermal spray gun 2, and a thermal spray gun 2. Gas supply means for supplying gas (plasma gas), air supply means for supplying atomized air to the spray gun 2, and plasma generation means for generating plasma are provided.

  The thermal spray gun 2 is attached to the tip of the main shaft 5 for turning (rotating) the thermal spray gun 2. The main shaft 5 transmits the rotational force from the motor 7 provided in the housing 6 via the timing belt 8 to rotate the thermal spray gun 2 attached to the tip thereof. In FIG. 1, the motor 7 rotates the thermal spray gun 2 in the direction indicated by the arrow X. A wire 3 serving as a thermal spray material is fed to the center of the thermal spray gun 2 through a work feed hole 9 formed through the main shaft 5 in the axial direction. The work feed hole 9 is formed as a through hole having a diameter enough to feed a wire 3 having a certain waveform, which will be described later, in order to guide and feed the wire 3.

  The gas supply unit and the air supply unit include a gas supply unit 10 that supplies plasma gas (gas), an air supply unit 11 that supplies atomized air, and a rotary joint 12 that is a path of gas air. The plasma gas supplied from the gas supply unit 10 and the atomized air supplied from the air supply unit 11 are supplied to the thermal spray gun 2 via respective supply paths (not shown) formed in the main shaft 5. It has become so.

  The plasma generating means has a power supply unit 13, one electrode connected to the positive electrode of the power supply unit 13, and the other electrode 14 connected to the negative electrode of the power supply unit 13. The other electrode 14 is fixed in the vicinity of a gas ejection hole (not shown) formed in the thermal spray gun 2. One electrode is formed of a contact tip 15 having conductivity for bringing the wire 3 into contact with the inside and feeding it.

  The thermal spray gun 2 is formed with a gas supply path for supplying plasma gas from the gas supply unit 10 to the gas ejection holes. Further, the spray gun 2 is formed with an air supply path for supplying atomized air from the air supply unit 11 to the air ejection holes. A plurality of air ejection holes are formed so as to surround the gas ejection hole.

  As shown in FIG. 2, the contact chip 15 has a through hole 16 communicating with the work feed hole 9 formed in the main shaft 5 and a female screw portion 17 formed in the vicinity of the outlet of the through hole 16. It is detachably attached to the supply guide 18. The contact chip 15 is made of, for example, a conductive material and functions as one electrode.

  As shown in FIG. 2, the contact chip 15 is made of, for example, copper having excellent conductivity, a male screw portion 19 that is screwed with the female screw portion 17 of the wire supply guide 18, and the female screw portion 19. And a wire feeding hole 21 for feeding the wire 3 to the shaft core. Further, as shown in FIG. 3, the contact chip 15 is divided into two chip parts 15A and 15B along the longitudinal direction with the axial center as a center. Then, the contact chip 15 has the wire feed hole 21 when the two chip parts 15A and 15B are overlapped and the screw portion 19 is screwed onto the female screw portion 17 of the wire supply guide 18. The wire 3 to be fed to is inserted and pressed.

  The contact tip 15 configured as described above is attached to the thermal spray gun 2 by screwing a male screw portion 19 into a female screw portion 17 of the wire supply guide 18 and is connected to a positive electrode of the power supply portion 13. The As a result, the contact chip 15 becomes one electrode. The contact chip 15 is not formed as the two chip parts 15A and 15B, but may be formed integrally by cutting a round bar made of copper or the like having excellent conductivity.

  The wire supply device 4 includes a wire feeding unit that feeds the wire 3 wound around the reel 22 to the contact chip 15 and a forming unit that forms the wire 3 into a waveform having a constant repetition.

  As shown in FIG. 4, the wire feeding means includes a wire feeding drive roller 23 that pulls out the wire 3 made of, for example, copper-plated steel from the reel 22 and feeds it to the contact chip 15. The wire feed driving roller 23 is a driving roller that is directly rotated by the driving force of a driving motor provided on the base member 24. Two wire feed driving rollers 23 are provided, and are arranged on both sides of the wire 3 with the wire 3 interposed therebetween in the feed direction of the wire 3. Both of these wire feed driving rollers 23 rotate in the direction of feeding the wire 3 to the contact chip 15, and pull out the wire 3 from the reel 22.

  The base member 24 is provided with a plurality of cam rollers 25 which are forming means for forming the wire 3 into a curved shape. A plurality of cam rollers 25 are provided in the vicinity of the wire feeding drive roller 23 (on the contact chip 15 side to which the wire 3 is fed when the reel 22 is upstream). These cam rollers 25 are formed so that the wire 3 has a waveform that is a curved shape that repeats a certain amount, and the waveform that is the curve is in contact with the inner wall of the wire feed hole 21 formed in the contact tip 15 at least three points. In other words, it is a corrugated roller.

  The cam roller 25 is a roller having a triangular shape with a circular arc at the tip because the wire 3 is pressed into a waveform. The cam rollers 25 are alternately arranged on both sides of the wire 3 along the feeding direction of the wire 3. In this embodiment, two cam rollers 25, 25 are arranged at a predetermined interval on one side across the wire 3, and the other side is left between the two cam rollers 25, 25. Cam roller 25 is disposed.

  The cam rollers 25 are rotated by utilizing the wire feeding force of the wire feeding drive roller 23. Specifically, of the three cam rollers 25, two cam rollers 25 are for driving a cam hung on a pulley 26 provided on each wire feed driving roller 23 and a pulley 27 provided on the cam roller 25. The belt 28 is rotated by the rotational driving force transmitted from the wire feed driving roller 23 by the belt 28. The remaining cam rollers 25 are rotated by the cam drive belts 28 that are hung on the respective pulleys 27 provided on one of the two cam rollers 25.

  When the wire feed driving roller 23 is rotated by a drive motor, the wire 3 is pulled out from the reel 22 and fed to the contact chip 15. Further, when the wire feeding drive roller 23 rotates, the cam roller 25 is caused to generate the wire feeding force of the wire feeding driving roller 23 by the cam driving belt 28 which is hung between the wire feeding driving roller 23 and the wire feeding driving roller 23. Use to rotate. Then, the remaining cam roller 25 is rotated by the cam driving belt 28 hung between the one cam roller 25.

  The three cam rollers 25 rotate by receiving the rotational driving force of the wire feed driving roller 23, and press the wire 3 at a triangular portion with the tip of the wire feeding roller 23 to form a waveform. Since the three cam rollers 25 are disposed on both sides of the wire 3 along the feeding direction of the wire 3, the wire 3 may be formed into a waveform having a continuous curved shape that is a constant repetition. it can.

  The corrugation to be formed on the wire 3 is such that the bending width W of the corrugated portion is at least larger than the hole diameter R dimension of the wire feed hole 21 so as to contact the inner wall surface of the wire feed hole 21. Make it big. The upper limit of the bending width W of the corrugated portion of the wire 3 is set to such a dimension that the wire 3 can be fed into the wire feeding hole 21. In addition, it is desirable that the waveform formed on the wire 3 is in contact with at least three points or more in the wire feeding hole 21 and the period of the wave is two or more.

  Next, a method for forming a thermal spray coating on a sprayed object using the thermal spray coating forming apparatus configured as described above and a wire feeding method will be described.

  First, plasma gas is supplied from the gas supply unit 10 to the gas supply path of the thermal spray gun 2 through the main shaft 5. Similarly, atomized air is supplied from the air supply unit 11 to the air supply path of the thermal spray gun 2 via the main shaft 5. Then, plasma gas is injected outside from a gas ejection hole. On the other hand, atomized air is jetted from the air jet holes to the outside so as to surround the plasma gas jetted from the gas jet holes.

  Next, the wire 3 is fed by the wire feeder 4. When the wire feed driving roller 23 rotates, the wire 3 starts to be fed. The wire 3 fed by the wire feed driving roller 23 is rotated by three cam rollers that utilize the wire feed force of the wire feed drive roller 23 before being sent to the work feed hole 9 of the main shaft 5. Therefore, the waveform is a curved shape that is a constant repetition.

  The corrugated wire 3 is fed to the wire feed hole 21 of the contact tip 15 from the through hole 16 of the wire supply guide 18 provided in the spray gun 2 through the workpiece feed hole 9 of the main shaft 5. The Since the wire 3 fed to the wire feed hole 21 has a corrugated shape, the arcuate tip of the wave-shaped portion is in contact with the inner wall surface of the wire feed hole 21 and goes deep into the hole. Go in.

  In this way, when the wire 3 comes into contact with at least three or more contacts in the wire feed hole 21 of the contact chip 15, power is supplied to the wire 3 from the plurality of contacts, and the wire 3 itself is one side. Electrode (plus electrode).

  Then, the wire 3 jumps straight out at the wire outlet 29. That is, the wire 3 is supplied to the front of the gas ejection hole. Then, in a state in which the contact state between the contact tip 15 and the wire 3 is maintained, a voltage is applied between the contact tip 15 serving as one electrode and the other electrode 14 provided in the vicinity of the gas ejection hole to conduct electricity. Then, plasma is generated between these electrodes. The plasma gas ejected from the gas ejection holes is burned by the plasma and becomes a combustion flame.

  The wire 3 is melted by the combustion flame to become a molten metal. The molten metal becomes a sprayed frame by atomized air sprayed from the air ejection holes and is sprayed toward the sprayed material, and is formed as a sprayed coating on the surface of the sprayed material. At the time of spraying on the sprayed object, the motor 7 is driven to rotate the main shaft 5 and the spray gun 2 attached to the tip of the main shaft 5 is turned.

  The wire 3 is fed in accordance with the progress of thermal spraying on the object to be sprayed. For example, when the spraying amount increases, the wire 3 is supplied to the spraying gun 2 more, and when the spraying amount decreases, the feeding amount of the wire 3 is reduced. Thus, even if the feed amount of the wire 3 fluctuates, the wire 3 and the contact tip 15 come into contact with each other at a plurality of locations, so that the wire is locally pressed against the wire feed hole 21 with a leaf spring. Therefore, the inner wall of the wire feed hole 21 is evenly worn and the life of the contact tip 15 is extended.

  According to the thermal spray coating forming apparatus of the first embodiment, the wire 3 is shaped so as to have a constant repetition, and the waveform is shaped so as to be in contact with at least three points on the inner wall of the wire feed hole 21 formed in the contact tip 15. If the wire 3 is formed by the means, the number of contact points with the wire 3 in the contact chip 15 increases, a stable power supply state to the wire 3 can be obtained, and the plasma arc can be stabilized. . Further, according to the present embodiment, the contact tip 15 and the wire 3 come into contact with each other at a constant pressure because of the contact with the wire 3 having a waveform that is repeatedly repeated, and the power supply state to the wire 3 is further improved. It can be further stabilized. Further, according to the present embodiment, by adjusting the arrangement interval of the cam rollers 25 provided on both sides of the wire 3, the bending width W of the wire 3 can be easily adjusted. The pressing force against the contact chip 15 can be easily changed. As a result, the power supply state to the wire 3 can be stabilized without increasing the pressing force due to the bending of the wire 3, and the life of the contact chip 15 can be improved.

  In addition, according to the thermal spray coating forming apparatus of the first embodiment, the forming means for forming the wire 3 into a waveform that repeats a certain amount is used to make the wire 3 into a waveform using the wire feeding force of the wire feeding means. The structure of the apparatus can be simplified and the cost can be reduced without preparing a dedicated molding drive source for making the wire 3 corrugated.

  In addition, according to the thermal spray coating forming apparatus of the first embodiment, the wire feeding means is constituted by the wire feeding drive rollers 25 arranged on both sides of the wire 3 along the feeding direction of the wire 3, and molded. Since the means is constituted by a cam roller 25 that rotates by transmitting the rotational driving force of the wire feed driving roller and presses the wire 3 to form a waveform, the cam roller 25 continuously forms a waveform that is repeatedly repeated. can do.

  In addition, according to the thermal spray coating forming apparatus of the first embodiment, the bending width W of the corrugated portion having the waveform of the wire 3 is set to be larger than at least the hole diameter R dimension of the wire feeding hole 21, so that the wire 3 is the wire It is possible to make contact with the inner wall surface of the feeding hole 21 with a constant pressing force, and to stabilize the contact state between the wire 3 and the contact tip 15.

  In the wire supply method according to the first embodiment, the wire 3 is formed into a waveform having a constant repetition, and then the wire 3 having the waveform is supplied to the wire feeding hole 21 formed in the contact chip 15 to form a waveform. By contacting at least three or more points with the inner wall surface of the wire feed hole 21, the number of contacts between the contact tip 15 and the wire 3 can be increased, and the power supply state to the wire 3 can be stabilized, resulting in plasma. Arc generation can be stabilized.

  In the first embodiment, the curved shape (waveform shape) is set to be a constant repetition. However, the waveform shape may be intermittently formed on the wire 3, and the size of the curved shape is changed regularly or partially. Then, the wire 3 may be formed.

“Embodiment 2”
FIG. 5 is a diagram illustrating the wire feeding device according to the second embodiment.

  In the second embodiment, the forming means is constituted by two wire feed driving rollers 30 disposed on both sides of the wire 3 with the wire 3 interposed therebetween, and is formed on the wire feed drive roller 30. By pressing the wire 3 with the unevenness thus formed, a waveform having a curved shape that is a constant repetition is formed.

  The wire feed driving roller 30 has a so-called gear shape in which convex portions 31 and concave portions 32 for forming a waveform that is repeatedly repeated on the wire 3 are alternately formed on the outer peripheral portion thereof. The two wire feed drive rollers 30 are arranged on both sides of the wire 3 and have a waveform that is repeatedly repeated on the wire 3 so that the protrusions 31 and the recesses 32 are engaged with each other via the wire 3. Are continuously formed.

  According to the thermal spray coating forming apparatus of the second embodiment, the wire feeding drive roller 30 itself, which is a wire feeding means for feeding the wire 3 to the contact chip 15, has a function of a shaping means for corrugating the wire 3. Since it was added, the waveform can be formed on the wire 3 without using the cam roller 25 as in the first embodiment. Therefore, according to the second embodiment, the device configuration can be further simplified.

“Embodiment 3”
FIG. 6 is a diagram illustrating the wire feeding device according to the third embodiment.

  In the third embodiment, the forming means is the wire feed driving rollers 33 arranged alternately on both sides of the wire 3 along the feed direction of the wire 3, and the three wire feed drive rollers 33 The wire 3 is formed into a waveform having a curved shape that is repeatedly repeated by the pressing force applied to the wire 3.

  The wire feed driving roller 33 according to the third embodiment is a roller having a cylindrical shape with no irregularities on the surface as in the first embodiment, and itself is a wire feeding means for feeding the wire 3 to the contact chip 15. At the same time, it also functions as a forming means that corrugates the wire 3. In the third embodiment, two wire feed driving rollers 33, 33 are arranged at a predetermined interval on one side of the wire 3 along the feed direction of the wire 3, and the two wire feeds are arranged on the other side. The remaining wire feeding drive rollers 33 are disposed so as to overlap partly into the gap between the drive rollers 33 and 33.

  In the third embodiment, when the three wire feed drive rollers 33 are directly rotated by the drive motor, the wire 3 is pressed by each wire feed drive roller 33 having a part of the rollers overlapped to be constant. It becomes a repetitive waveform.

  According to the thermal spray coating forming apparatus of the third embodiment, the wire feeding driving roller 33 itself, which is a wire feeding means for feeding the wire 3 to the contact chip 15, has a function of a shaping means for corrugating the wire 3. Since it was added, the waveform can be formed on the wire 3 without using the cam roller 25 as in the first embodiment. In particular, in the third embodiment, since it is not necessary to form irregularities on the roller surface as in the second embodiment, the apparatus structure can be simplified.

“Embodiment 4”
FIG. 7 is a diagram illustrating a wire feeding device according to a fourth embodiment.

  In the fourth embodiment, the forming means is a slidable corrugated member 34 arranged alternately on both sides of the wire 3 along the feeding direction of the wire 3, and the three corrugated members 34 By sliding, the wire 3 is pushed in and formed into a corrugated shape that is a curved shape that repeats a certain amount.

  The waveform forming member 34 is made of a steel material having a circular tip, and is shaped to be slidable in a direction toward and away from the wire 3 by a slide drive source (not shown) so as to shape the wire 3 into a waveform. . Two corrugated members 34 are arranged one above the other at a predetermined interval on one side with the wire 3 in between, and a part of the tip is projected between the two corrugated members 34, 34 on the other side. The remaining corrugated members 34 are arranged so as to overlap with each other.

  In the fourth embodiment, the wire feeding means for feeding the wire 3 to the contact chip 15 is fed by the wire feeding drive roller 23 as in the first embodiment, but the waveform is a constant repetition on the wire 3. The forming means for forming the three waveform forming members 34 is slidable. The three corrugation forming members 34 simultaneously slide from the left and right directions with respect to the wire 3 to be fed to press the wire 3 to form a corrugation. By repeating this continuously, the wire 3 is formed into a waveform having a constant repetition.

  According to the thermal spray coating forming apparatus of the fourth embodiment, the wire 3 is fixedly repeated by the slidable wave forming members 34 that are alternately arranged on both sides of the wire 3 along the feeding direction of the wire 3. Therefore, the wire 3 having a constant waveform can be continuously formed.

  INDUSTRIAL APPLICABILITY The present invention can be used for a thermal spray coating forming apparatus that forms a thermal spray coating by spraying a molten thermal spray material toward a sprayed object.

DESCRIPTION OF SYMBOLS 1 ... Spray coating formation apparatus 2 ... Spray gun 3 ... Wire 4 ... Wire feeding apparatus 5 ... Main axis | shaft 10 ... Gas supply part 11 ... Air supply part 14 ... Electrode (other electrode)
15 ... Contact chip (one electrode)
21 ... Wire feed hole 23, 30, 33 ... Wire feed drive roller (wire feed means)
25. Cam roller (forming means)
28 ... Cam drive belt 31 ... Convex part 32 ... Concave part 34 ... Waveform forming member

Claims (7)

A wire serving as a thermal spray material is fed into a contact tip serving as one electrode attached to the thermal spray gun by a wire feeder, and plasma is generated between the contact tip and the other electrode provided in the vicinity of the gas ejection hole. In a thermal spray coating forming apparatus that forms a thermal spray coating on the surface of a sprayed material by burning a gas injected from a gas ejection hole by plasma to melt the wire and injecting the molten metal toward the sprayed material ,
The wire supply device
Wire feeding means for feeding the wire to the contact tip;
Forming means for forming the wire into a repeatedly curved shape and forming the curved portion so as to come into contact with at least three points on the inner wall of the wire feed hole formed in the contact chip. A thermal spray coating apparatus characterized by The thermal spray coating forming apparatus according to claim 1,
The said forming means shape | molds this wire in a curved shape using the wire feeding force of the said wire feeding means. The thermal spray coating formation apparatus characterized by the above-mentioned. The thermal spray coating forming apparatus according to claim 2,
The wire feeding means comprises wire feeding drive rollers arranged on both sides of the wire along the feeding direction of the wire,
The thermal spray coating apparatus according to claim 1, wherein the forming means includes a cam roller that rotates by receiving a rotational driving force of the wire feeding drive roller and presses the wire to form a curved shape. The thermal spray coating forming apparatus according to claim 2,
The forming means presses the wire with the unevenness formed on the wire feed driving rollers disposed on both sides of the wire along the wire feeding direction, thereby forming a repeated curved shape. A thermal spray coating apparatus characterized by The thermal spray coating forming apparatus according to claim 2,
The forming means is composed of wire feed drive rollers arranged alternately on both sides of the wire along the wire feed direction, and the wire feed drive roller presses the wire with the pressing force. An apparatus for forming a thermal spray coating, wherein a wire is formed into a repeated curved shape. The thermal spray coating forming apparatus according to claim 2,
The thermal spray coating forming apparatus characterized in that a bending width of a bending portion in which the wire is bent is set to be at least larger than a hole diameter of the wire feeding hole. A wire serving as a thermal spray material is fed into a contact tip serving as one electrode attached to the spray gun, and plasma is generated between the contact tip and the other electrode provided in the vicinity of the gas ejection hole. In a wire supply method in a thermal spray coating forming apparatus, in which a gas sprayed from a hole is burned to melt the wire, and the molten metal is sprayed toward the thermal spray to form a thermal spray coating on the surface of the thermal spray ,
After forming the wire into a repeated curved shape, the wire having the curved shape is supplied to the wire feeding hole formed in the contact chip, and the curved portion is at least provided on the inner wall surface of the wire feeding hole. A wire feeding method characterized by contacting three or more points.

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