JP6449030B2 - 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 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. 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, in the thermal spraying process performed by inserting the thermal spray gun into the bore, the bore surface (the object to be sprayed) and the thermal spray gun are relatively close to each other. For this reason, the reflective particles and sprayed fume that bounce off the bore surface are likely to adhere to the 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 the passage to the outside, and the nozzle is a first discharge port that faces in a first direction that is an axial direction of the case body and that is the tip side of the case body, and A second discharge port facing a second direction perpendicular to the first direction, and the first direction side with respect to the second direction when viewed in a direction perpendicular to both the first direction and the second direction. The third direction is inclined and the case is more than the second discharge port. It is characterized in that it comprises a third discharge port located proximally of the body, the.

  In a preferred embodiment, the third discharge port is located between the first discharge port and the second discharge port in the second direction.

  In a preferred embodiment, the third discharge port is located in front of the first discharge port in the second direction.

  In a preferred embodiment, an angle formed by the second direction and the third direction is in a range of 30 to 60 ° when viewed in a direction perpendicular to both the first direction and the second direction. .

  In a preferred embodiment, a plurality of the third discharge ports are provided.

  In a preferred embodiment, the gas flow path includes a first branch flow path connected to the first discharge port, a second branch flow path connected to the second discharge port, and a third branch connected to the third discharge port. A branch channel and a common channel through which each of the first to third branch channels communicates.

  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 the figure which showed the condition which performs a thermal spraying process using a thermal spray gun, and was seen in the VII-VII arrow direction of FIG. It is sectional drawing similar to FIG. 5 which shows the other example of a thermal spray gun. It is the IX-IX arrow directional view of FIG. It is sectional drawing which follows the XX line of FIG.

  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 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 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, 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 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. The second discharge port 216b faces a direction y (second direction) that is perpendicular to 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. That is, when viewed in a direction perpendicular to both the direction x and the direction y, the angle θ formed by the direction y and the direction in which the third discharge port 216c faces is 0 ° <θ <90 °. The angle θ is preferably in the range of 30 to 60 °. FIG. 5 shows a case where the angle θ is 45 °.

  The third discharge port 216c is located closer to the base end side (upward in FIG. 5) of the case body 210 than the second discharge port 216b. The third discharge port 216c is located between the first discharge port 216a and the second discharge port 216b in the direction y.

  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 to third discharge ports 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 and second branch channels 252 and 253 are separated from each other, and each communicates with the common channel 251. 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. 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, a procedure for performing a thermal spraying process on the workpiece 500 using the above-described thermal spray gun 200 and thermal spraying apparatus 100 will be described.

  As shown in FIGS. 1 and 7, a cylinder block is used as the workpiece 500, and a thermal spraying process is performed on the bore surface S (cylindrical inner surface) of the cylinder block (work 500). The thermal spraying process for the bore surface S is performed in a state in which the thermal spray gun 200 (case body 210) is inserted inside the bore surface S. Here, the case body 210 is disposed at a position offset with respect to the bore surface S. Specifically, as shown in FIG. 7, when viewed in the axial direction of the case body 210, the second discharge port 216b has a bore in a direction r that is perpendicular to the directing direction p of the second discharge port 216b. The position is deviated from the central axis Os of the surface S.

  The ratio (L1 / D1) of the deviation amount L1 that the second discharge port 216b deviates from the central axis Os in the direction r with respect to the inner diameter dimension D1 of the bore surface S is in the range of 1/30 to 1/10. For example, when the inner diameter D1 of the bore surface S is about 100 mm, the deviation amount L1 is about 5 mm.

  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 nozzle 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 spray coating on the bore surface S (surface of the sprayed object).

  During the thermal spraying process, the bore surface S is rotated around the central axis Os by the workpiece moving mechanism 112 (see FIG. 1). As shown in FIG. 7, the rotation direction of the bore surface S is centered in the direction r at a portion 510 that intersects the bore surface S in front of the directing direction p of the second discharge port 216 b when viewed in the axial direction of the case body 210. The direction is closer to the axis Os (arrow N1 in the figure).

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

  In the thermal spray gun 200 of the present embodiment, as shown in FIG. 5, the nozzle 216 faces the first discharge port 216 a facing the distal end side (direction x) of the case body 210 and the direction y perpendicular to the direction x. In addition to the second discharge port 216b, the third discharge port 216c is included. The third discharge port 216c is located closer to the base end side (upward in FIG. 5) of the case body 210 than the second discharge port 216b, and is viewed in a direction perpendicular to both the direction x and the direction y. It is directed in the direction inclined to the direction x side from y (the diagonally lower left direction in FIG. 5). According to such a configuration, the reflective particles and the sprayed fumes that bounce off the bore surface S during the spraying process are blown away in a direction away from the case body 210 by the gas flow from the third discharge port 216c. Therefore, it is possible to prevent spraying fumes and the like from adhering to the vicinity of the tip of the case body 210.

  The third discharge port 216c is located in front of the first discharge port 216a in the direction y. Further, when viewed in a direction perpendicular to both the direction x and the direction y, the angle θ between the direction y and the direction in which the third discharge port 216c faces is in the range of 30 to 60 °. According to such a configuration, it is possible to blow off spraying fumes and the like that stay in a larger space in the front side in the direction y than the first discharge port 216a more accurately.

  As shown in FIG. 7, the second discharge port 216 b is the center of the bore surface S in the direction r perpendicular to the directing direction p of the second discharge port 216 b when viewed in the axial direction of the case body 210. The position is deviated from the axis Os. According to such a configuration, the gas ejected from the second discharge port 216b is bounced back by the bore surface S and then goes to the same side (clockwise in FIG. 7) in the circumferential direction of the bore surface S. As a result, a swirling flow indicated by an arrow N2 is generated in the inner space of the bore surface S. As a result, it is avoided that the reflective particles and the sprayed fumes that have bounced off the bore surface S during the spraying process are directed to the front surface of the case body 210 and prevent the sprayed fumes and the like from adhering to the vicinity of the tip of the case body 210. it can.

  As shown in FIG. 7, the rotation direction of the bore surface S is the axial direction of the case body 210, and the portion 510 that intersects the bore surface S in the direction r in front of the directing direction p of the second discharge port 216 b is in the direction r. This is the direction (arrow N1 in the figure) approaching the central axis Os. According to such a configuration, since the direction of the swirl flow (arrow N2) generated by the gas flow from the second discharge port 216b is the same as the rotation direction of the bore surface S (arrow N1), the swirl flow is used. The thermal spray fumes and the like go to the area of the bore surface S where the thermal spraying has already been completed. Accordingly, it is possible to prevent adhesion of sprayed fumes and the like to the unsprayed area of the bore surface S, and to improve the spray quality.

  As described with reference to FIG. 7, the ratio (L1 / D1) of the deviation amount L1 that the second discharge port 216b deviates from the central axis Os in the direction r with respect to the inner diameter dimension D1 of the bore surface S is 1 The range is / 30 to 1/10. According to such a configuration, even when the outer diameter of the case body 210 is relatively larger than the inner diameter of the bore surface S, the thermal spray gun 200 (the case body 210) is inserted inside the bore surface S. A swirling flow can be generated by the gas flow from the second discharge port 216b.

  8 to 10 show modified examples of the spray gun. In the following description, the same or similar elements as those of the above-described thermal spray gun 200 are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  In the spray gun 200 ′ shown in FIG. 8, the formation position of the third discharge port 216 c is different from the spray gun 200 described above. The third discharge port 216c is formed at the lower end (tip) of the cylindrical main body 211 (case body 210). The third discharge port 216c is located in front of the first discharge port 216a in the direction y. 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. When viewed in a direction perpendicular to both the direction x and the direction y, an angle θ formed by the direction y and the direction in which the third discharge port 216c faces is 0 ° <θ <90 °. The angle θ is preferably in the range of 30 to 60 °. FIG. 8 shows a case where the angle θ is 45 °.

  As shown in FIG. 9, the third discharge ports 216c are provided in a plurality (three in this embodiment). As shown in FIG. 10, each of the plurality of third discharge ports 216 c has an end connected to a communication path 255, and the communication path 255 communicates with a later-described third branch flow path 254. The plurality of third discharge ports 216c shown in FIG. 9 are each directed in the direction y when viewed in the axial direction of the case body 210, and are in a positional relationship parallel to each other.

  In the thermal spray gun 200 ′, the gas flow path 250 has a third gas branch flow path 254 in addition to the first and second gas branch flow paths 252 and 253. The first to third branch channels 252, 253, and 254 are separated from each other, and each communicates with the common channel 251. The third branch flow path 254 is connected to each third discharge port 216c via the communication path 255.

  The thermal spray gun 200 ′ shown in FIGS. 8 to 10 has the same effects as the thermal spray gun 200 and the thermal spray apparatus 100 described above. Further, the plurality of third discharge ports 216 c are formed to be separated from each other when viewed in the axial direction of the case body 210. According to such a configuration, the gas flow ejected from the plurality of third discharge ports 216 c diffuses over a wide range in the circumferential direction of the case body 210. As a result, it is possible to more accurately prevent 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.

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, 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 216c Third discharge port 217 Insulation member 220 Wire conduit 230 Power supply tip 231 (of power supply tip) Base end 231a Male screw 240 Guide liner 241 Lower end portion 250 (of guide liner) Gas flow path 251 Common flow path 252 First branch flow path 253 Second branch flow path 254 Third branch flow path 255 Communication path 300 Power supply section 310 Power supply cable 400 Gas supply hand Step 500 Workpiece (spraying object)
O1 Center axis Ox Arc point Os Center axis (center axis of cylindrical inner surface)
p Direction direction r direction (direction perpendicular to the direction)
S Bore surface (cylindrical inner surface)
W Spray wire x direction (first direction)
y direction (second 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;
Provided on the front end side of the case body, and a nozzle for ejecting the gas that has passed through the gas flow path to the outside,
The nozzle may come toward the first discharge port a-axis direction of the case body toward a first direction which is the distal end side of the case body, a second direction which is perpendicular to the first direction, the first forward of the discharge port in the first direction, and forms a second discharge port located at the rear in the second direction, a right angle as viewed in a direction that is perpendicular to both the first direction and the second direction It faces the third direction between the first direction and the second direction, and is located in front of the first discharge port in the first direction and rearward in the first direction than the second discharge port. And a third discharge port
The thermal spray gun, wherein the third discharge port is located between the first discharge port and the second discharge port in the second direction . As seen in the direction which is perpendicular to both the first direction and the second direction, the angle between the second direction and the third direction is in the range of 30 to 60 °, according to claim 1 Thermal spray gun. 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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