JP6434320B2 - 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 melted spray wire is sprayed onto the sprayed object by the gas flow ejected from the nozzle, and a sprayed coating is formed on the surface of the sprayed object (see, for example, Patent Document 1).

  Patent Document 1 describes a thermal spraying apparatus for performing an arc thermal spraying process on the bore 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. In a state where the spray gun is inserted into the cylinder bore, a gas flow is ejected from the nozzle to form a spray coating 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 arranged in the cylindrical member, there is no direct adhesion of reflective particles or oxides of fine particles (sprayed fume) to the wire conduit and the gas flow path, These wire conduits and gas flow paths are protected.

  However, the gas ejected from the nozzle during the thermal spraying process gradually diffuses. For this reason, in the thermal spraying process performed by inserting the thermal spray gun into the bore, the reflective particles and thermal spray fumes that bounce off the bore surface are likely to adhere to the thermal spray gun. If thermal spray fumes or the like adhere to the periphery of the nozzle, the gas flow ejected from the nozzle may be disturbed or an arc may not be generated appropriately. In such a case, the intended sprayed coating is not formed, and the quality of the sprayed coating is degraded. Further, when spraying fumes or the like adhere to the spray gun, these deposits may be peeled off later and sprayed onto the surface of the sprayed object by the gas flow from the nozzle. When such a situation is caused, the quality of the sprayed coating is also deteriorated.

Japanese Patent No. 4496783

  The present invention has been conceived under such circumstances, and it is an object of the present invention to provide a thermal spray gun suitable for preventing adhesion of welding fume and the like, and a thermal spraying apparatus including the same. And

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

  The thermal spray gun provided by the first aspect of the present invention includes a cylindrical case body, a pair of wire conduits that are inserted in the case body, and through which the thermal spray wire is passed, and the distal end side of the case body A pair of power supply tips for supplying power to the spray wire, a gas flow path for flowing gas, a gas flow path for flowing a gas, a tip end side of the case body, and the gas flow A nozzle for ejecting gas that has passed through a passage to the outside, wherein the nozzle includes a plurality of discharge ports facing in a direction intersecting with an axial direction of the case body, These discharge ports are characterized in that they are oriented so as to converge with each other in the forward direction.

  In a preferred embodiment, the directing direction of the plurality of discharge ports as a whole is oriented so as to be displaced in a first direction that is the axial direction of the case body and toward the front end side of the case body as it goes forward. It has been.

  In a preferred embodiment, the directivity direction of each of the plurality of discharge ports is directed to a predetermined convergence position.

  In a preferred embodiment, the convergence position is at a position overlapping the case body when viewed in the axial direction of the case body.

  In a preferred embodiment, the plurality of discharge ports are arranged in a substantially U shape when viewed from the front.

  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 thermal 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 a VII-VII arrow line view of FIG. FIG. 3 is an enlarged side view (partially represented in cross section) of the vicinity of the tip of the thermal spray gun, showing a situation in which thermal spraying is performed using the thermal spray gun shown in FIG. It is a figure for demonstrating the directivity direction of a some discharge outlet.

  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 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 at the outer side of the front end side of the case body 210, and the intersection is set as the arc point P1.

  As shown in FIG. 5 and FIG. 6, a nozzle 216 for injecting a thermal spray gas to the outside is provided at the tip of the case body 210. In the present embodiment, the nozzle 216 includes a first discharge port 216a and a second discharge port 216. The first and second discharge ports 216a and 216b are directed in different directions.

  The first discharge port 216a is formed in the insulating member 217 located near the lower end of the case body 210, and is a direction x (first direction) that is the axial direction of the case body 210 and the front end side of the case body 210. Facing.

  The second discharge port 216 b is formed at the tip of the hanging part of the lower cover 213. A plurality of second discharge ports 216b are provided, and each second discharge port 216b faces a direction intersecting the direction x. The plurality of second discharge ports 216b are for spraying the molten metal directly onto the object to be sprayed after the spray wire W is melted at the arc point P1, and directed toward the arc point P1. In the present embodiment, as shown in FIGS. 7 and 8, the plurality of second discharge ports 216 b are oriented so as to converge with each other in the direction of the front. These second discharge ports 216b correspond to the discharge ports in the present invention. In FIGS. 7 and 8, line segments along the directing direction of the second discharge ports 216b are indicated by alternate long and short dash lines.

  In the present embodiment, the plurality of second discharge ports 216b have a circular cross section perpendicular to the respective directivity directions, and are arranged in a substantially U shape when viewed from the front (see FIG. 6). . In the present embodiment, as shown in FIG. 8, the direction x as a whole of these second discharge ports 216 b (indicated by arrow D <b> 1 in FIG. 8) is the direction x that is the front end side of the case body 210 as it goes forward. Is directed to displace. Further, as shown in FIGS. 7 and 8, the plurality of second discharge ports 216b are directed to the convergence point P2 (convergence position) in which the respective directivity directions are substantially common. As clearly shown in FIG. 8, the convergence point P <b> 2 is at a position overlapping the case body 210 when viewed in the axial direction of the case body 210. In addition, in FIG. 8, the cross section cut | disconnected along the direction in which the 2nd discharge outlet 216b is arranged about the part in which the 2nd discharge outlet 216b was provided is represented. In addition, the plurality of second discharge ports 216b are formed with the intention that the respective directing directions face the common convergence point P2, but in reality, some errors may occur. Therefore, the line segment along the directing direction of each second discharge port 216b does not necessarily pass through the convergence point P2, but may pass through the vicinity of the convergence point P2.

  The gas flow path 250 is provided inside the case body 210 and is a flow path for flowing the spray gas to the nozzle 216 (first and second discharge ports 216a and 216b). 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 and second branch channels 252 and 253 are separated from each other, and each communicates with the common channel 251. The first and second branch channels 252 and 253 are connected to the first and second discharge ports 216a and 216b, respectively. In the present embodiment, the first branch flow path 252 is provided at two locations separated in the direction y.

  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 a function of guiding the spray wire W by inserting the 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 a material include synthetic resins such as Teflon (registered trademark) 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 feed tip 230 through the lower end portion 241 of the guide liner 240 and travels toward the arc point P1 along the central axis O1 while being in contact with the power feed 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. An arc is generated between the ends of the pair of spray wires W by short-circuiting the pair of spray wires W fed from the pair of power supply tips 230 at the arc point P1.

  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 nozzle 216 (first and second discharge ports 216 a and 216 b). 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 object to be sprayed (work 500). For example, a cylinder block is used as the workpiece 500, and a thermal spraying process is performed on the bore surface of the cylinder block. As shown in FIG. 8, the thermal spraying process on the bore surface S is performed with the thermal spray gun 200 (case body 210) inserted inside the bore surface S. During the thermal spraying process, the bore surface S (surface of the object to be sprayed) is rotated and moved up and down by the workpiece moving mechanism 112 (see FIG. 1).

  In the thermal spray gun 200 of the present embodiment, the plurality of second discharge ports 216b facing the vicinity of the arc point P1 are oriented so as to converge toward each other as the respective directivity directions go forward. The gas ejected from each of the plurality of second discharge ports 216b gradually diffuses, but these second discharge ports 216b are oriented so as to converge with each other. For this reason, the gas ejected from each of the plurality of second discharge ports 216b is superimposed, and a gas flow having a high flow rate and a high flow rate and strong directivity is formed. As a result, the reflective particles and thermal spray fumes that bounce off the bore surface S (surface of the sprayed object) are difficult to diffuse. Therefore, it is possible to prevent spraying fumes and the like from adhering to the vicinity of the tip of the case body 210.

  As described above with reference to FIGS. 7 and 8, the directivity directions of the plurality of second discharge ports 216b are directed to the common convergence point P2. This convergence point P2 is at a position overlapping the case body 210 when viewed in the axial direction of the case body 210. According to such a configuration, as can be understood from FIG. 8 and the like, a highly directional gas flow is appropriately applied to the bore surface S (surface of the sprayed object) located in the vicinity of the case body 210. Can be sprayed. This is preferable in preventing spraying fumes and the like from adhering to the vicinity of the tip of the case body 210.

  As shown in FIG. 8, the directivity direction D1 as a whole of the plurality of second discharge ports 216b is oriented so as to be displaced in the direction x which is the front end side of the case body 210 as it goes forward. That is, the plurality of second discharge ports 216b are oriented so as to move away from the case body 210 toward the distal end side of the case body 210 as a whole. According to such a structure, it can suppress that the reflective particle which bounced off in the bore surface S (surface of a to-be-sprayed object) goes to the case body 210 side. This is preferable in preventing spraying fumes and the like from adhering to the vicinity of the tip of the case body 210.

  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-described embodiment, each of the plurality of second discharge ports 216b is configured such that the directivity direction thereof faces the common convergence point P2, but the present invention is not limited to such a configuration, and the plurality of discharge ports It is only necessary that each directing direction is oriented so as to converge toward a predetermined convergence position. For example, as shown in FIG. 9, the directivity direction of each of the plurality of discharge ports may be directed to a predetermined convergence area S2 and pass through the convergence area S2, and the directivity direction of each of the plurality of discharge ports may be The configuration may be such that it is directed toward the predetermined convergence line L2 and passes through the convergence line L2.

  In the above-described embodiment, the axial direction of the case body 210 and the direction x (first direction) that is the front end side of the case body 210 as the directivity direction D1 as a whole of the plurality of second discharge ports 216b goes forward. Although it is directed to be displaced, it is not limited to this. For example, the directivity direction as a whole of the plurality of discharge ports may be in a direction perpendicular to the axial direction of the case body 210.

  In the above embodiment, the case where the first discharge port 216a and the second discharge port 216b are provided as the nozzle 216 for ejecting the spray gas to the outside has been described as an example. However, the first discharge port and the second discharge port are described. Another discharge port that faces in a different direction from the outlet may be additionally provided.

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 Nozzle 216a First discharge port 216b Second discharge port (discharge port)
217 Insulating member 220 Wire conduit 230 Feed tip 231 (feed tip) base end 231a Male screw 240 Guide liner 241 (guide liner) lower end 250 Gas channel 251 Common channel 252 First branch channel 253 Second branch flow Road 300 Power supply unit 310 Power supply cable 400 Gas supply means 500 Workpiece (sprayed object)
D1 Directional direction (directional direction as a whole of a plurality of discharge ports)
L2 convergence line (convergence position)
O1 Center axis P1 Arc point P2 Convergence point (convergence position)
S Bore surface S2 Convergence area (convergence position)
W Spray wire x direction (first direction)
y direction

Claims (3)

A cylindrical case body;
A pair of wire conduits inserted into the case body for passing the spray wire;
A pair of power supply tips provided on the tip side of the case body for supplying power to the spray wire;
A gas passage provided inside the case body for flowing gas;
A spray gun provided with a nozzle provided on the front end side of the case body and for ejecting the gas that has passed through the gas flow path to the outside,
The nozzle includes a plurality of discharge ports facing a direction intersecting the axial direction of the case body,
The plurality of discharge ports are arranged in a substantially U shape when viewed from the front perpendicular to the axial direction of the case body,
The plurality of discharge ports are oriented so that each directing direction converges toward the front ,
The directivity direction of the plurality of discharge ports as a whole is oriented so as to be displaced in the first direction that is the axial direction of the case body and the front end side of the case body as it goes forward.
Each of the plurality of discharge ports has a directivity direction as viewed in the axial direction of the case body and as viewed from the side that is perpendicular to both the axial direction and the front view direction. A thermal spray gun characterized by converging and moving toward a predetermined convergence position . The thermal spray gun according to claim 1 , wherein the convergence position is located at a position overlapping the case body when viewed in the axial direction of the case body. And spray gun according to claim 1 or 2, a wire feeding means for feeding a thermal spray wire into the thermal spray gun, a gas supply means for feeding gas into the spray gun, a power supply means for supplying power to the thermal spray gun A thermal spraying device comprising:

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