JP6383673B2 - Thermal spray gun and thermal spray apparatus provided with the same - Google Patents

Description

  The present invention relates to a thermal spray gun for forming a thermal spray coating on an object to be sprayed, and a thermal spray apparatus including the same.

  In arc spraying performed using a thermal spraying device, the thermal spray wire is melted by arc discharge while the thermal spray wire is fed to the thermal spray gun. The molten spray wire is sprayed onto the sprayed object by a gas flow, and a sprayed coating is formed on the surface of the sprayed object. For thermal spraying in a narrow part or on the inner surface of a long tubular material, a long thermal spray gun is required, but a thermal spraying device equipped with such a long thermal spray gun is known (for example, a patent Reference 1).

  In the thermal spraying apparatus described in Patent Document 1, the molten material W (thermal spray wire) is passed through a pair of molten material conduits 2 (wire conduits) and fed to a pair of molten material nozzles 16 (power feeding tips). The pair of melt conduits 2 extend in the longitudinal direction so that they are substantially parallel to each other. The pair of melt nozzles 16 are disposed on the distal end side of the melt conduit 2. As shown in FIG. 5 of Patent Document 1, these melt nozzles 16 are set to bend inward with respect to the melt conduit 2. The central axes of the pair of melt nozzles 16 intersect at the outer end side of the melt nozzle 16 (arc point). The melt W that has passed through the melt conduit 2 and the melt nozzle 16 moves toward the arc point on the central axis, and arc discharge is performed there to form droplets. As shown in FIG. 4 of the same document, an air conduit 3 (gas flow path) is provided substantially parallel to the melt conduit 2, and the gas flowing through the air conduit 3 is converted into droplets of the melt. It spouts toward. As shown in FIG. 5 of the same document, a Teflon (registered trademark) pipe 11 (guide liner) is inserted into the melt conduit 2, and the melt W is passed through the inside of the Teflon pipe 11. The sliding resistance of the molten material is reduced.

  On the other hand, Patent Document 2 describes a thermal spraying apparatus for performing an arc thermal spraying process on a bore surface (cylindrical inner surface) of a cylinder block. The thermal spraying device described in the document includes a relatively long thermal spray gun. The thermal spray gun has a configuration in which a wire conduit and a gas flow path are provided inside a cylindrical member (extension portion). With the spray gun inserted into the cylinder bore, a spray coating is formed on the bore surface. The sprayed coating is formed on the bore surface while relatively moving the spray gun and the cylinder block (bore surface). Since the wire conduit and the gas flow path are disposed in the cylindrical member, welding fume or the like does not directly adhere to the wire conduit and the gas flow path, and the wire conduit and the gas flow path are protected.

  In the configuration in which the wire conduit is disposed in the long cylindrical member as disclosed in Patent Document 2, the path of the wire conduit becomes long, so that the sliding resistance of the wire in the wire conduit increases. A guide liner is preferably inserted into the wire conduit to reduce the sliding resistance of the wire. Further, from the viewpoint of reducing the sliding resistance of the wire, the guide liner is preferably made of resin such as Teflon resin.

  On the other hand, about the wire conduit | pipe arrange | positioned in a cylindrical member, heat dissipation is bad, and it becomes easy to become high temperature with the heat | fever from a feed chip. When the guide liner is inserted into the wire conduit, if the guide liner is brought close to the power feed tip, the guide liner may be softened or deteriorated due to exposure to a high temperature environment, and the function of guiding the wire may be impaired. . In order to avoid such problems, measures such as reducing the spraying current supplied to the power supply chip to suppress the temperature rise or arranging the guide liner away from the power supply chip can be considered. Productivity decreases due to the decrease in speed and instability of wire feeding.

Japanese Patent No. 3030442 Japanese Patent No. 4496783

  The present invention has been conceived under such circumstances, and in a configuration including an extension nozzle, a spray gun suitable for improving the efficiency of spraying processing, and a spraying apparatus including the same The issue is to provide

  In order to solve the above problems, the present invention employs the following technical means.

  A thermal spray gun provided by the first aspect of the present invention includes a cylindrical extension portion extending along a predetermined axial direction, and a pair of wire conduits that are inserted into the extension portion and allow the thermal spray wire to pass therethrough. And a pair of power feed tips that are detachably provided on the distal end side of the extension portion and are arranged so that their center axes intersect each other outside the distal end side of the extension portion, and the pair of wire conduits, respectively. And a pair of guide liners for guiding the spray wire, and a gas flow path provided inside the extension portion for flowing a spray gas, wherein the tip of the guide liner has the power supply The pair of wire conduits are inserted into the base end portion of the chip and extend along the central axis of the power supply chip. It is characterized in that it is location.

  In a preferred embodiment, the wire conduit extends outward from the base end side of the extension portion.

  In a preferred embodiment, the guide liner is inserted over the entire length of the wire conduit and extends outward from the proximal end of the wire conduit.

  In a preferred embodiment, the guide liner is made of a flexible resin.

  In a preferred embodiment, the distal end side of the extension portion is provided with a plurality of discharge ports facing in different directions, and the gas flow path is a plurality of branch flow paths each connected to the discharge port. And a common channel in which each of the plurality of branch channels communicates, and the pair of wire conduits are disposed in the common channel.

  The thermal spray apparatus provided by the second aspect of the present invention includes a thermal spray gun according to the first aspect of the present invention, wire feeding means for feeding a thermal spray wire to the thermal spray gun, and a gas for feeding gas to the thermal spray gun. It is characterized by comprising supply means and power supply means for supplying power to the spray gun.

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

1 is an overall schematic diagram illustrating an example of a thermal spraying apparatus including a thermal spray gun according to the present invention. It is a front view showing an example of a thermal spray gun concerning the present invention. It is sectional drawing which follows III-III of FIG. It is sectional drawing which follows IV-IV of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is the elements on larger scale of FIG. It is sectional drawing similar to FIG. 6 for demonstrating the effect | action of a thermal spray gun.

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

  FIG. 1 is an overall schematic view showing an example of a thermal spraying apparatus provided with a thermal spray gun according to the present invention. The thermal spraying apparatus 100 includes a base 110, a support plate 120 standing on the base 110, a pair of wire feeding mechanisms 130 provided on the support plate 120, a spray gun 200, a power supply unit 300, a gas Supply means 400.

  A mounting table 111 is provided on the base 110, and a workpiece 500 (a sprayed object) is placed on the mounting table 111. The placement table 111 is supported by the workpiece moving mechanism 112. Although detailed illustration explanation is omitted, the workpiece moving mechanism 112 can perform slide movement, raising and lowering, and rotation in a horizontal plane, and the workpiece moving mechanism 112 can perform a desired movement on the workpiece 500. Can be given.

  In the present embodiment, the wire feeding mechanism 130 includes a wire reel 131, a guide roller 132, a feeding roller 133, and a motor 134, and the spray wire W wound around the wire reel 131 is directed toward the spray gun 200. To send out.

  The wire reel 131 has, for example, a form in which the sprayed wire W is wound around a reel that is rotatable about an axis extending in the horizontal direction, and the sprayed wire W can be fed out while rotating. The spray wire W fed out from the wire reel 131 changes its direction downward through the guide roller 132 and reaches the spray gun 200.

  The feed roller 133 is driven by a motor 134 at least one of a pair of rollers. The feed roller 133 is provided at two locations, a position close to the wire reel 131 and a position close to the spray gun 200. In the present embodiment, the spray wire W is supplied to the spray gun 200 in a pair by driving the pair of wire feeding mechanisms 130.

  The power supply unit 300 supplies power to the thermal spray gun 200. The electric power from the power supply unit 300 is controlled at a constant voltage and supplied to the thermal spray gun 200 through the power supply cable 310, and is supplied to the power supply chip 230 through the wire conduit 220 and the power supply member 215 described later.

  The gas supply means 400 feeds gas into the spray gun 200. For example, compressed air ejected by a compressor is fed into the spray gun 200 in a state where the flow rate and pressure are controlled.

  The thermal spray gun 200 performs arc thermal spraying on an object to be sprayed, and is supported by the support plate 120 via a bracket 140 provided at an appropriate position. As shown in FIGS. 2 to 6, the thermal spray gun 200 includes a case body 210, a pair of wire conduits 220, a pair of power supply tips 230, a pair of guide liners 240, and a gas flow path 250.

  The case body 210 includes a cylindrical main body 211, an upper cover 212, and a lower cover 213. The cylindrical main body 211 has a cylindrical shape extending in a long shape in a predetermined axial direction. The upper cover 212 closes the upper end (base end) of the cylindrical main body 211, and the lower cover 213 is provided at the lower end (front end) of the cylindrical main body 211. The cylindrical main body 211 corresponds to an extension portion in the present invention.

  The wire conduit 220 is for passing the spray wire W, and is constituted by a metal pipe such as a copper pipe. The wire conduit 220 is inserted into the cylindrical main body 211, and the lower portion of the wire conduit 220 is supported by the case body 210 via an insulating member 214 provided near the lower end of the case body 210. The upper part of the wire conduit 220 passes through the upper cover 212 and extends to the outside from the upper end side (base end side) of the case body 210. The wire conduit 220 extends substantially parallel to the axial direction of the cylindrical main body 211. The lower end of each wire conduit 220 is connected to a metal power supply member 215. As will be described in detail later, the pair of wire conduits 220 is disposed in the gas flow path 250.

  The power feed chip 230 is attached to the power feed member 215. The power supply member 215 is positioned between the wire conduit 220 and the power supply chip 230, and is provided in a pair so as to correspond to the pair of power supply chips 230. More specifically, as clearly shown in FIG. 6, a female screw 215 a is formed at the distal end portion of the power supply member 215, and a male screw 231 a is formed at the base end portion 231 of the power supply chip 230. The power supply chip 230 is attached to the power supply member 215 by screwing the male screw 231a with the power supply member 215a. In this way, the power supply chip 230 is detachably provided on the lower end side (front end side) of the case body 210.

  The pair of female screws 215 a formed on the pair of power supply members 215 extends while being inclined with respect to the axial direction of the cylindrical main body 211. As clearly shown in FIG. 6, the pair of power supply chips 230 attached to the pair of power supply members 215 are closer to each other with the central axis O1 toward the tip of the case body 210. These central axes O1 intersect on the outer side of the front end side of the case body 210, and the intersection is set as the arc point Ox.

  As shown in FIGS. 5 and 6, a discharge port 216 for ejecting the spray gas to the outside is provided at the tip of the case body 210. In the present embodiment, the discharge port 216 includes a first discharge port 216a, a second discharge port 216b, and a third discharge port 216c. These first to third discharge ports 216a, 216b, 216c are directed in different directions.

  The first discharge port 216 a is formed in the insulating member 217 located near the lower end of the case body 210, and faces the direction x that is the axial direction of the case body 210 and the front end side of the case body 210. The second discharge port 216 b is formed at the tip of the hanging part of the lower cover 213. The second discharge port 216b faces a direction y that intersects the direction x. As shown in FIG. 6, the second discharge port 216b includes a plurality of long holes. As shown in FIG. 5, the third discharge port 216 c is formed in the hanging part of the lower cover 213. The third discharge port 216c faces a direction (third direction) inclined toward the direction x with respect to the direction y when viewed in a direction perpendicular to both the direction x and the direction y. The third discharge port 216c is located closer to the base end side of the case body 210 than the second discharge port 216b.

  The gas flow path 250 is provided inside the case body 210 and is a flow path for flowing the spray gas to the discharge port 216 (216a, 216b, 216c). In the present embodiment, the gas flow path 250 is configured by the internal space of the case body 210 and includes a common flow path 251, a first branch flow path 252, and a second branch flow path 253. The common flow path 251 occupies most of the inner space of the cylindrical main body 211 and has a relatively large volume. The cross-sectional area occupied by the common channel 251 is relatively large with respect to the outer diameter of the cylindrical main body 211.

  The wire conduit 220 is exposed in the common flow path 251. In this way, the wire conduit 220 is disposed in the common flow path 251 (gas flow path 250). The first branch flow path 252 is connected to the first discharge port 216a. The second branch flow path 253 is connected to the second and third discharge ports 216b and 216c. The first and second branch channels 252 and 253 are separated from each other. In the present embodiment, the first branch flow path 252 is provided at two locations separated in the direction y. The first and second branch channels 252 and 253 are each in communication with a common channel 251.

  The pair of guide liners 240 are inserted into the pair of wire conduits 220, respectively. The guide liner 240 has a flexible cylindrical shape, and fulfills the function of guiding the thermal spray wire W by inserting the thermal spray wire W. As a material constituting the guide liner 240, a material having a low sliding resistance of the spray wire W is preferable. Examples of such materials include synthetic resins such as Teflon resin.

  Each guide liner 240 is inserted over the entire length of the wire conduit 220. As clearly shown in FIG. 6, the lower end portion 241 (distal end portion) of the guide liner 240 is inserted into the base end portion 231 of the power supply chip 230 and extends along the central axis O <b> 1 of the power supply chip 230. Yes. As shown in FIGS. 3 and 4, the upper end (base end) of the guide liner 240 protrudes from the upper end (base end) of the wire conduit 220 and extends to the outside.

  Next, operations of the thermal spray gun 200 and the thermal spray apparatus 100 according to the above-described embodiment will be described.

  During the thermal spraying operation performed using the thermal spraying apparatus 100, the thermal spray wire W is fed to the thermal spray gun 200 by the wire feeding mechanism 130. The supplied spray wire W passes through the guide liner 240 and advances through the wire conduit 220 while being guided by the guide liner 240. Then, the spray wire W is sent to the power supply tip 230 through the lower end portion 241 of the guide liner 240 and travels toward the arc point Ox along the central axis O1 while being in contact with the power supply tip 230.

  Power is supplied to the thermal spray gun 200 by the power supply unit 300. When the spray wire W comes into contact with the power supply chip 230, power is supplied from the power supply member 215 to the spray wire W through the power supply chip 230. Then, an arc is generated between the tips of the pair of spray wires W by short-circuiting the pair of spray wires W sent from the pair of power supply tips 230 at the arc point Ox.

  The spray gas 200 is also fed with compressed gas from the gas supply means 400. The gas passes through the gas flow path 250 (common flow path 251, first and second branch flow paths 252 and 253), and is ejected from the discharge port 216 (first to third discharge ports 216 a to 216 c). The jetted gas is blown to the arc at the tip of the spray wire W, and the molten metal becomes droplets or fine particles to form a sprayed coating on the surface of the sprayed object.

  In the thermal spray gun 200 of the present embodiment, a wire conduit 220 inserted into a long cylindrical main body 211 is disposed in a gas flow path 250 (common flow path 251). According to such a configuration, the wire conduit 220 is cooled by the gas flowing through the gas flow path 250 (common flow path 251). When a thermal spray arc is generated, the power feed tip 230 or the wire conduit 220 is likely to become hot due to the radiant heat of the arc near the power feed tip 230 or the resistance heat generation in the wire conduit 220. Since the wire conduit 220 inserted into the long cylindrical body 211 is relatively long, by exposing the wire conduit 220 to the gas flow path 250 (common flow path 251), the wire conduit 220 or the power supply is supplied. The chip 230 can be efficiently cooled. As a result, exposure of the wire conduit 220 or the power feed tip 230 to a high temperature environment can be avoided.

  By efficiently cooling the wire conduit 220 or the power feed tip 230 as described above, the wire conduit 220 or the power feed tip 230 can be prevented from being exposed to a high temperature environment. For this reason, even if the guide liner 240 inserted into the wire conduit 220 is made of a resin, for example, the guide liner 240 can be inserted up to the power feed chip 230 side. In the present embodiment, as described above with reference to FIG. 6, the distal end portion 241 of the guide liner 240 is inserted into the proximal end portion 231 of the power feed chip 230 and extends along the central axis O <b> 1 of the power feed chip 230. It extends. According to such a configuration, since the spray wire W can be stably fed toward the arc point Ox, the quality of the spray coating can be improved. In addition, a guide liner 240 having a low sliding resistance such as Teflon resin can be adopted, and the feeding stability of the spray wire W is improved.

  According to the configuration in which the distal end portion 241 of the guide liner 240 is inserted into the proximal end portion 231 of the power supply chip 230, when the male screw 231a of the power supply chip 230 is loosened and the power supply chip 230 is removed, as shown in FIG. The front end portion 241 of the liner 240 faces the outside of the lower end of the cylindrical main body 211. Thereby, when exchanging the guide liner 240, the used guide liner 240 can be extracted from the lower part of the cylindrical main body 211, and a new guide liner 240 can be inserted from the lower part of the cylindrical main body 211. Therefore, exchanging workability of the guide liner 240 is excellent.

  The guide liner 240 is inserted over the entire length of the wire conduit 220 and extends from the proximal end of the wire conduit 220 to the outside. According to such a configuration, it is possible to improve the feeding stability of the sprayed wire W by the guide liner 240 while improving the workability of replacing the guide liner 240.

  The gas channel 250 includes a plurality of branch channels 252 and 253 each connected to the discharge port 216a (216b and 216c), and a common channel 251 in which each of the plurality of branch channels 252 and 253 communicates. . The pair of wire conduits 220 are disposed in the common flow path 251. In the present embodiment, the discharge ports (216a, 216b, 216c) have three systems, whereas the gas flow channel 250 passes through the common flow channel 251 and the branch flow channels (252, 253) corresponding to the discharge ports. ). According to such a configuration, the flow rate of the gas flowing through the common flow channel 251 is larger than the flow rate of the gas flowing through each branch flow channel 252 (253). Therefore, the configuration in which the pair of wire conduits 220 is disposed in the common flow path 251 is suitable for efficiently cooling the wire conduits 220.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in the claims are all within the scope of the present invention. Is included.

  In the above embodiment, the case where the power feeding chip is configured by one member has been described, but the power feeding chip may be configured by two or more members. For example, the power feed tip may be constituted by two members including a first tip member located on the wire conduit side and a second tip member that is detachably attached to the first tip member. The distal end portion of the guide liner is inserted from the entire first tip member to the proximal end of the second tip member. According to such a configuration, the guide liner can be replaced simply by removing the second tip member on the distal end side of the extension portion.

DESCRIPTION OF SYMBOLS 100 Thermal spray apparatus 110 Base 111 Mounting table 112 Work moving mechanism 120 Support plate 130 Wire feed mechanism 131 Wire reel 132 Guide roller 133 Feed roller 134 Motor 140 Bracket 200 Thermal spray gun 210 Case body 211 Cylindrical main body 212 Upper cover 213 Lower cover 214 Insulating member 215 Power supply member 215a Female screw 216 Discharge port 216a First discharge port 216b Second discharge port 216c Third discharge port 217 Insulating member 220 Wire conduit 230 Power supply tip 231 (of the power supply tip) 231a Male screw 240 Guide Liner 241 (guide liner) lower end (tip)
250 Gas flow path 251 Common flow path 252 First branch flow path 253 Second branch flow path 300 Power supply section 310 Power supply cable 400 Gas supply means 500 Workpiece (sprayed object)
O1 Center axis Ox Arc point W Spray wire x direction y direction

Claims (6)

A cylindrical extension portion extending along a predetermined axial direction;
A pair of wire conduits that are inserted into the extension part, for passing the spray wire;
A pair of power supply chips that are detachably provided on the distal end side of the extension part, and are arranged so that the central axes intersect each other outside the distal end side of the extension part;
A pair of guide liners, each inserted in the pair of wire conduits, for guiding the spray wire;
A gas flow path provided inside the extension portion for flowing a spray gas,
A distal end portion of the guide liner is inserted into a proximal end portion of the power supply chip and extends along the central axis of the power supply chip.
The spray gun, wherein the pair of wire conduits are disposed in the gas flow path.   The thermal spray gun according to claim 1, wherein the wire conduit extends outward from a base end side of the extension portion.   The thermal spray gun according to claim 2, wherein the guide liner is inserted over the entire length of the wire conduit and extends outward from a proximal end of the wire conduit.   The thermal spray gun according to claim 1, wherein the guide liner is made of a flexible resin. On the distal end side of the extension part, there are provided a plurality of discharge ports facing different directions,
The gas flow path includes a plurality of branch flow paths each connected to the discharge port, and a common flow path where each of the plurality of branch flow paths communicates,
The thermal spray gun according to any one of claims 1 to 4, wherein the pair of wire conduits are disposed in the common flow path.   6. The thermal spray gun according to any one of claims 1 to 5, wire feeding means for feeding a thermal spray wire to the thermal spray gun, gas supply means for feeding gas to the thermal spray gun, and power for supplying electric power to the thermal spray gun A thermal spraying device comprising a supply means.

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