WO2017163325A1 - 溶射トーチ - Google Patents
溶射トーチ Download PDFInfo
- Publication number
- WO2017163325A1 WO2017163325A1 PCT/JP2016/059143 JP2016059143W WO2017163325A1 WO 2017163325 A1 WO2017163325 A1 WO 2017163325A1 JP 2016059143 W JP2016059143 W JP 2016059143W WO 2017163325 A1 WO2017163325 A1 WO 2017163325A1
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- WO
- WIPO (PCT)
- Prior art keywords
- molten material
- discharge port
- adhere
- torch
- thermal
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/22—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc
- B05B7/222—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc using an arc
- B05B7/224—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc using an arc the material having originally the shape of a wire, rod or the like
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/12—Organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/22—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/42—Plasma torches using an arc with provisions for introducing materials into the plasma, e.g. powder, liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
- B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles
Definitions
- the present invention relates to a thermal spraying torch that forms a thermal spray coating by spraying a molten material onto a thermal spray surface of a workpiece.
- a thermal spraying technique is known in which a sprayed coating is formed by spraying a molten material made of metal, ceramic, or the like on the inner surface of a cylinder bore of a cylinder block in an automobile engine or the like (see Patent Document 1 below).
- the thermal spraying torch When forming the thermal spray coating, the thermal spraying torch is inserted into the cylinder bore and rotated and moved in the axial direction, and the molten particles obtained by melting the thermal spray material are discharged as a thermal spray frame. At that time, a part of the molten particles (primary particles) immediately after being ejected from the thermal spraying torch and a part of the molten particles (secondary particles) that could not be attached by rebounding after flying toward the inner surface of the cylinder bore are sprayed. It adheres to and deposits as film residue. The coating residue deposited on the thermal spraying torch falls off during the thermal spraying operation, mixes in the newly ejected thermal spraying frame, and adheres to the inner surface of the cylinder bore, thereby degrading the quality of the thermal spraying coating.
- an object of the present invention is to suppress the deterioration of the quality of the sprayed coating due to the mixing of coating residue.
- the thermal spray torch according to the present invention is characterized in that the discharge port peripheral portion includes a portion to which the molten material easily adheres, and the outer surface portion includes a portion to which the molten material is less likely to adhere than the discharge port peripheral portion. .
- the molten material (primary particles) immediately after being discharged from the discharge port of the thermal spraying torch is likely to adhere to the thermal spraying torch because of its high heat quantity. Since primary particles with strong adhesion force will adhere to the peripheral part of the discharge port, which has a portion where the molten material is likely to adhere, it is possible to more reliably suppress the dropping of the film residue due to the primary particles adhering to the peripheral part of the discharge port. .
- the molten material (secondary particles) that has been ejected from the spraying torch's discharge port and bounced off the sprayed surface and did not adhere is easy to peel off from the thermal spraying torch even if it adheres due to its low heat quantity and weak adhesion.
- the outer surface portion includes a portion to which the molten material does not easily adhere, it is possible to more reliably suppress the adhesion of the secondary particles having originally weak adhesion force to the outer surface portion of the portion to which the adhesion is difficult. For this reason, generation
- the thermal spray coating can suppress the deterioration of the quality due to the mixture of coating residue.
- FIG. 1 is a perspective view of a thermal spray torch according to an embodiment of the present invention.
- FIG. 2 is a perspective view seen from the back side of the thermal spraying torch.
- FIG. 3 is a front view of the thermal spray torch.
- 4 is a cross-sectional view taken along the line AA of FIG. 3 including a state in which a sprayed coating is formed on the inner surface of the cylinder bore.
- FIG. 5 is an operation explanatory view showing the flying state of the sprayed particles discharged from the spraying torch.
- a spraying torch 1 shown in FIGS. 1 to 4 forms a sprayed coating 9 by spraying sprayed particles 7 as a molten material onto an inner surface 5a of a cylinder bore 5 in a cylinder block 3 (see FIG. 4) of an automobile engine or the like.
- the cylinder block 3 constitutes a workpiece
- the cylinder bore 5 constitutes a circular hole
- the inner surface 5a of the cylinder bore 5 constitutes a sprayed surface.
- the thermal spray torch 1 is rotated and moved in the axial direction while being inserted into the cylinder bore 5, thereby forming a thermal spray coating 9 on almost the entire inner surface 5a. After the thermal spray coating 9 is formed, honing is performed on the thermal spray coating 9 to make the surface smooth, and the sliding surface of the piston ring is obtained.
- the thermal spraying torch 1 includes an iron torch main body 11, and a copper cover 13 covering the torch main body 11 is detachably attached to the torch main body 11.
- a spray wire 15 which is a spray material, is sequentially fed toward the discharge port 17 by a feed mechanism (not shown).
- the thermal spraying wires 15 are made of an iron-based material, and are arranged in parallel on the left and right as shown in FIG.
- the two thermal spraying wires 15 protrude from the discharge ports 17 and are in positions close to each other.
- the two spraying wires 15 are movably inserted into wire insertion holes formed in the torch body 11 and are electrically insulated from the wire insertion holes.
- a voltage is applied between the electrodes of each spray wire 15 with one spray wire 15 as a plus (+) electrode and the other spray wire 15 as a minus ( ⁇ ) electrode. Then, a discharge arc is generated between the electrodes in the vicinity of the intersection on the extension line in the feed-out direction of the two sprayed wires 15 described above, and the two sprayed wires 15 are melted by the thermal energy of the discharge arc. Note that an electrode for applying a voltage to the spray wire 15 is omitted.
- the torch main body 11 of the thermal spraying torch 1 includes a gas flow path 19 communicating with the discharge port 17 inside.
- the gas flow path 19 is located between the two left and right spray wires 15.
- the gas flow path 19 communicates with the upstream portion 19 a parallel to the rotation center axis P of the thermal spraying torch 1 and the lower end of the upstream portion 19 a, and the downstream portion where the tip communicates with the discharge port 17. 19b.
- the molten material in which the spray wire 15 is melted by the gas flowing through the gas flow path 19 becomes spray particles 7 and is discharged forward from the discharge port 17.
- a substantially conical recess 23 is formed on the front side in the discharge direction of the discharge port 17 in the torch body 11, and the discharge port 17 opens in the recess 23.
- the recess 23 includes a bottom wall 23a in which the discharge port 17 is opened at the center, and an annular side wall 23b that is located on the periphery of the discharge port 17 on the front side in the discharge direction and is formed along the discharge direction of the spray particles 7. It has.
- the annular side wall 23b has a tapered shape in which the front side of the discharge port 17 in the discharge direction expands. That is, the annular side wall 23 b has a tapered shape such that the diameter on the bottom wall 23 a side is smaller than the diameter on the opening side in the recess 23.
- the torch body 11 includes a planar front surface portion 11a on the side provided with the recess 23, side surface portions 11b and 11c that continue in a curved shape from the left and right sides to the back side in FIG. 3 of the front surface portion 11a, and the front surface portion 11a.
- a curved rear surface portion 11d continuous with both side surface portions 11b and 11c and a flat front end surface portion 11e.
- the rear surface portion 11d is connected so that the edges on the opposite side of the front surface portion 11a of both side surface portions 11b and 11c are continuous with each other.
- the front end surface portion 11e is continuous with the front surface portion 11a, the side surface portions 11b and 11c, and the rear surface portion 11d by a curved surface portion.
- the cover portion 13 includes a flat cover front surface portion 13a that covers the front surface portion 11a of the torch body 11, and flat cover side surface portions 13b and 11c that bend from the left and right sides to the back side of the cover front surface portion 13a in FIG. And.
- the cover front surface portion 13a is provided with a circular opening 13a1 that opens so that the recess 23 is exposed to the outside.
- the diameter of the circular opening portion 13a1 is larger than the circular diameter of the opening side end portion of the recess 23. Therefore, an annular front exposed portion 25 is formed at the opening side end portion of the recess 23.
- the width dimension W of the front exposed portion 25 is uniform over the entire circumference, for example, about 1 mm.
- Two band pieces 13d extend from the edge of the cover side surface portion 13b opposite to the cover front surface portion 13a so as to cover the rear surface portion 11d of the torch body 11. Further, two band pieces 13e extend from the edge of the cover side surface portion 13c opposite to the cover front surface portion 13a so as to cover the rear surface portion 11d of the torch body 11. Furthermore, from the end edge on the front end side of the cover front surface portion 13a, one front end band piece 13f extends in a direction orthogonal to the band pieces 13d and 13e so as to cover the front end surface portion 11e and the rear surface portion 11d.
- the band pieces 13d and 13e are curved so as to cover the rear surface portion 11d of the convex curved surface of the torch body 11, and the respective end portions 13d1 and 13e1 are located at substantially the center of the rear surface portion 11d.
- the distal end side overlapping portion 27 and the proximal end side overlapping portion 29 are formed by overlapping the end portions 13d1 and 13e1 with each other.
- the distal end side overlapping portion 27 overlaps the end portion 13f1 of the distal end band piece 13f on the end portion 13d1 of the distal end side band piece 13d.
- the front end side overlapping portion 27 is fixed by the fastener 30 in a state where three of the band pieces 13d and 13e and the front end band piece 13f are overlapped.
- the base end side overlapping portion 29 is fixed by the fastener 31 in a state where the two band pieces 13d and 13e are overlapped.
- the cover portion 13 includes mounting pieces 13g and 13h extending in the same direction as the band pieces 13d and 13e on the base end side of the cover side face portions 13b and 13c opposite to the tip band pieces 13f.
- the mounting pieces 13g and 13h are fixed to the side surface portions 11b and 11c of the torch body 11 with screws 33 and 35.
- the cover part 13 forms a band part by the fasteners 30 and 31 before being attached to the torch body 11, and forms a space into which the torch body 11 is inserted. In this state, the cover part 13 is attached to the torch body 11 by inserting the torch body 11 into the space in the cover part 13 and then fastening the screws 33 and 35.
- the thermal spray torch 1 has the torch body 11 made of iron and the cover portion 13 made of copper.
- the surface of the annular side wall 23b of the iron torch main body 11 and the surface of the annular front exposed portion 25 are subjected to, for example, shot blasting so that the surface roughness is further roughened to form fine uneven portions.
- Specific surface roughness of the side wall 23b and the front exposed portion 25 is Ra (arithmetic average roughness) of 0.1 to 6 ⁇ m and Rz (ten-point average roughness) of 0.5 to 50 ⁇ m.
- the surface of the copper cover portion 13, particularly the surface of the cover front portion 13 a is subjected to, for example, a polishing process so as to have a substantially mirror surface with a finer and smoother surface roughness.
- the specific surface roughness of the cover portion 13 is such that Ra (arithmetic average roughness) is 0.09 ⁇ m or less and Rz (ten-point average roughness) is 0.9 ⁇ m or less.
- the surface roughness of the annular side wall 23b and the front exposed portion 25 of the torch body 11 and the surface of the copper cover portion 13 are different from each other, and the former surface roughness is greater than the latter surface roughness. Is also rough. In other words, the latter surface roughness is finer than the former surface roughness.
- the sprayed particles 7 are more likely to adhere to the surfaces of the annular side wall 23 b and the front exposed portion 25 of the torch body 11 than the surface of the cover portion 13. In other words, the sprayed particles 7 are less likely to adhere to the surface of the cover portion 13 than the respective surfaces of the annular side wall 23 b and the front exposed portion 25 of the torch body 11.
- the side wall 23b includes a portion to which the sprayed particles 7 are more likely to adhere than the cover front surface portion 13a, and the cover front surface portion 13a includes a portion to which the sprayed particles 7 are less likely to adhere than the side wall 23b.
- the above-mentioned side wall 23b constitutes the discharge port peripheral portion, and the cover front surface portion 13a and the front exposed portion 25 constitute an outer surface portion continuous to the distal end side of the discharge port peripheral portion.
- the outer surface portion has an end portion (front surface exposed portion 25) on the side continuous with the peripheral edge portion of the discharge port (side wall 23b) more than a portion (cover front surface portion 13a) where the molten material of the outer surface portion is difficult to adhere. It is formed on the surface where the molten material easily adheres.
- the droplets of the sprayed particles 7 bite into the irregularities of the rough surface, and the interface adhesion force is strongly generated.
- the adhesion force is weakened.
- the spray particles (primary particles) 7 discharged from the discharge port 17 of the spray torch 1 fly forward along the side wall 23 b of the recess 23 and reach the inner surface 5 a of the cylinder bore 5. . At this time, a part of the sprayed particles 7 flying along the side wall 23b adheres to the side wall 23b and becomes a coating residue A.
- the side wall 23b is made of a material having a high affinity for the thermal spraying particle 7, which is the same iron-based material as the thermal spraying particle 7, and is formed on a rough surface with fine irregularities, so that the thermal spraying particle 7 is likely to adhere. . Further, the sprayed particles 7 (primary particles) immediately after being discharged from the discharge port 17 of the thermal spraying torch 1 have a high amount of heat (energy) and thus have high adhesion, and therefore the coating residue A due to the primary particles adhering to the side wall 23b is extremely high. It will be difficult to drop off.
- the cover part 13 in the thermal spraying torch 1 is made of a material having a low affinity for the thermal spray particles 7, which is made of copper, and the surface of the cover part 13 including the cover front part 13 a is substantially mirror-finished by polishing.
- the surface properties are such that the sprayed particles 7 are difficult to adhere. For this reason, adhesion of the thermal spray particle 7 (secondary particle 7a) with respect to the cover part 13 is suppressed.
- the secondary particles 7a described above have a smaller particle size than the sprayed particles 7 from the time when they are discharged from the discharge port 17 until they reach the inner surface 5a. Since it is low and energy when colliding with an object is low, the adhesion is weak. Therefore, the adhesion of the thermal spray particles 7 (secondary particles 7a) to the cover portion 13 is further suppressed.
- the secondary particles 7a include those of the sprayed particles 7 that are radially spread from the discharge port 17 and sprayed to the inner surface 5a, and inferior particles located at the outer end rebound on the inner surface 5a.
- the inferior particles are smaller in size than the good particles located in the center, are easily cooled by the outside air, and have a low flight speed.
- the secondary particles 7 a that are mainly generated by such rebounding of bad particles are extremely difficult to adhere to the cover portion 13.
- the sprayed particles 7 (secondary particles 7a) that have not been rebounded and adhered to the inner surface 5a of the cylinder bore 5 after being discharged from the discharge port 17 of the thermal spraying torch 1 have a low amount of heat (energy) and a weak adhesive force. Even if it adheres, it is easy to peel off from the thermal spraying torch 1 (cover part 13). Therefore, by making the surface of the cover part 13 that is a part to which the secondary particles 7a adhere to have a surface property to which the spray particles 7 are difficult to adhere, the adhesion of the secondary particles 7a having originally weak adhesion force to the cover part 13 is prevented. Suppress more reliably. Therefore, film debris due to the secondary particles 7a is less likely to be generated on the surface of the cover portion 13, and the film debris is more reliably suppressed.
- the side wall 23b and the front surface exposed portion 25, to which the molten material easily adheres have a rougher surface than the cover front surface portion 13a.
- the cover front surface portion 13 a to which the molten material of the cover portion 13 is difficult to adhere has a finer surface roughness than the side wall 23 b and the front surface exposed portion 25.
- the spray particles 7 immediately after being discharged from the discharge port 17 are more reliably attached to the side wall 23b and the front surface exposed portion 25 of the torch body 11 to form a coating residue A that is difficult to fall off.
- the sprayed particles 7 (secondary particles 7 a) are less likely to adhere to the surface of the cover portion 13, and the film residue from the cover portion 13 can be more reliably suppressed.
- the side wall 23b and the front exposed portion 25 where the molten material easily adheres are made of iron having a lower thermal conductivity than the copper cover portion 13.
- the cover front surface portion 13 a to which the molten material of the cover portion 13 is difficult to adhere is made of copper having a higher thermal conductivity than the iron side wall 23 b and the front surface exposed portion 25.
- the sprayed particles 7 immediately after being discharged from the discharge port 17 retain a higher amount of heat. Even if such sprayed particles 7 holding a higher amount of heat adhere to the side wall 23b and the front exposed portion 25 made of a material having lower thermal conductivity, the release of the amount of heat is suppressed, and the higher amount of heat is generated. Can be maintained.
- the thermal spray particles 7 in which a higher amount of heat is maintained have stronger adhesion and are extremely difficult to peel off from the side wall 23b and the front exposed portion 25.
- the secondary particles 7a adhere to the cover front surface portion 13a, since the cover portion 13 is made of copper having higher thermal conductivity, the amount of heat held by the secondary particles 7a is easily released to the cover portion 13. For this reason, the secondary particles 7a having a low calorific value have a lower calorific value, and even if they adhere to the cover part 13, they immediately fall before they become a film residue and can be prevented from falling off after becoming a film residue. .
- the cover front surface portion 13a to which the molten material of the cover portion 13 is difficult to adhere is made of copper having a lower affinity with the spray particles 7 than the iron side wall 23b and the front surface exposed portion 25.
- the side wall 23b and the front surface exposed portion 25 to which the molten material easily adheres are made of iron having a higher affinity for the molten material than the copper cover portion 13.
- the torch body 11 including the side wall 23b and the front exposed portion 25 made of iron having higher affinity with the molten material, the adhesion force of the spray particles 7 to the side wall 23b and the front exposed portion 25 can be further enhanced.
- the cover part 13 including the cover front part 13a is made of copper having a lower affinity with the molten material, thereby further suppressing the adhesion of the secondary particles 7a to the cover part 13 including the cover front part 13a. it can.
- the outer surface portion of the thermal spray torch 1 is melted more than the front surface portion 13a where the front surface exposed portion 25 corresponding to the end portion on the side continuous to the side wall 23b is hard to adhere the molten material of the outer surface portion. It is formed on the surface where the material is easy to adhere. In this case, the portion where the molten material is difficult to adhere does not exist on the flight path of the sprayed particles 7 in the recess 23 immediately after being discharged from the discharge port 17.
- the sprayed particles 7 discharged from the discharge port 17 generate a small vortex that wraps around the opening 23 of the recess 23 toward the cover front surface portion 13a. Since the annular front exposed portion 25 that is a part of the iron torch body 11 is provided in the vicinity where the vortex is generated, the vortex can be prevented from reaching the cover portion 13. Since the front exposed portion 25 has a surface property equivalent to that of the side wall 23b, it easily adheres when the sprayed particles 7 that become the vortex flow reach, and even if it becomes a film residue, it can suppress dropping off from the point where the adhesion force is strong.
- the peripheral edge portion of the discharge port is configured by a side wall 23b of the portion that becomes the recess 23 with respect to the outer surface portion, and the side wall 23b has a tapered shape in which the front side of the discharge port 17 in the discharge direction expands.
- the film residue formed when connected to the side wall 23b and the front surface exposed portion 25 is formed by the side wall 23b and the front surface exposed portion 25. Since the bending angle becomes a gentler obtuse angle, it becomes difficult to fall off.
- the thermal spray torch 1 has a torch body 11 and a cover portion 13 that covers the torch body 11 and is detachable from the torch body 11, and the molten material of the outer surface portion adheres to the cover portion 13. Sites that are difficult to perform are provided.
- the part where the molten material is difficult to adhere can be configured as a separate member from the torch body 11, and the part where the molten material is difficult to adhere and the part where the molten material is likely to adhere can be easily formed.
- the above-described cover portion 13 can be easily removed from the torch body 11 by removing the screws 33 and 35. Thereby, even if the molten material remains attached to the surface of the cover portion 13, the cleaning operation is easy. Moreover, since the cover part 13 has covered especially the front part 11a of the torch main body 11, it can suppress that the torch main body 11 touches a hot molten material directly, and can protect the torch main body 11 from a heat
- the cover part 13 is fastened and fixed to the torch body 11 around the mounting pieces 13g and 13h by two screws 33 and 35, and the other part is covered with a band part made up of band pieces 13d, 13e and 13f. Yes.
- the cover part 13 is only in the vicinity of the two screws 33, 35, which is firmly attached to the torch body 11. For this reason, even if the cover portion 13 is heated to a high temperature, for example, by directly touching the molten material, the heat conduction from the cover portion 13 to the torch body 11 is slight, and the temperature rise of the torch body 11 can be suppressed.
- the spraying torch 1 discharges the sprayed particles 7 from the discharge port 17 while rotating in a state where the spraying torch 1 is inserted into the cylinder bore 5 which is a circular hole, and the molten material on the outer surface portion is difficult to adhere.
- the part is provided at least on the rear side in the rotational direction of the thermal spraying torch 1.
- the spraying torch 1 rotates and sprays the sprayed particles 7 from the discharge port 17, the molten material that cannot adhere to the inner surface 5 a, such as the secondary particles 7 a that bounce off the inner surface 5 a of the cylinder bore 5, rotates the spraying torch 1. There are more on the rear side in the direction. For this reason, adhesion of the secondary particles 7a to the cover front surface portion 13a can be more reliably suppressed by providing at least the cover front surface portion 13a on the rear side in the rotational direction of the thermal spraying torch 1.
- the sprayed coating 9 is formed on the inner surface 5a of the cylinder bore 5
- the present invention is also applied to the case where the sprayed coating is formed on the sprayed surface other than the inner surface 5a of the cylinder bore 5. be able to.
- the torch body 11 is made of iron as a material having low thermal conductivity or high affinity for the molten material in order to easily attach the molten material.
- the torch body 11 is not limited to iron.
- the cover portion 13 is made of copper as a material having high thermal conductivity or low affinity to the molten material.
- the cover portion 13 is not limited to copper. DLC (Diamond Like Carbon) may be used. In short, it is only necessary that the surface of the torch body 11 adheres more easily to the molten material than the surface of the cover portion 13, and the surface of the cover portion 13 is less likely to adhere the molten material than the surface of the torch body 11.
- the side wall 23b and the front exposed portion 25 of the torch body 11 are subjected to surface treatment by shot blasting in order to easily attach the molten material.
- unevenness is formed by machining or sanding. A rougher rough surface may be used.
- the cover front surface portion 13a of the cover portion 13 is polished and mirror-finished so that the molten material is difficult to adhere, but may be mirror-finished by other methods such as a chemical method.
- the above-described cover portion 13 may be configured to include only the cover front surface portion 13a and only cover the front surface portion 11a of the torch body 11.
- the cover front surface portion 13a is attached to the torch body 11 by, for example, screwing. Since the molten material that has not adhered to the inner surface 5a of the cylinder bore 5 moves mainly toward the front surface portion 11a of the torch body 11, only the portion corresponding to the front surface portion 11a is sufficient as a portion where the molten material is difficult to adhere. An effect is obtained.
- the cover portion 13 is provided as a separate member from the torch body 11, but the cover portion 13 may not be used.
- the surface of the front surface portion 11a of the torch body 11 is smoothed by polishing or the like to make a mirror surface.
- the surface of the front part 11a of the torch main body 11 becomes a surface property to which the molten material is less likely to adhere than the respective surfaces of the side wall 23b and the front exposed part 25.
- a step is formed between the surface of the cover front portion 13a and the surface of the front exposed portion 25 of the torch body 11 by attaching the cover portion 13 to the torch body 11.
- an annular protrusion is provided on the opening side periphery of the recess 23 of the torch body 11, and the cover part 13 is attached to the torch body 11 by inserting the annular protrusion into the circular opening 13 a 1 of the cover part 13. You may make it attach.
- the front end surface of the annular protrusion corresponds to the front exposed portion 25, and the front end surface of the protrusion (front exposure) is obtained by making the protrusion height of the annular protrusion substantially equal to the plate thickness of the cover portion 13. Portion 25) and the surface of the cover front surface portion 13a are substantially flush with each other.
- the annular protrusion is provided, in the configuration in which the cover portion 13 includes only the cover front surface portion 13a, the protrusion is positioned and the workability of attaching the cover portion 13 to the torch body 11 is improved.
- the present invention is applied to a spraying torch that forms a sprayed coating by spraying a molten material onto a surface to be sprayed of a workpiece.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Electromagnetism (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Air-Conditioning Systems (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Plasma Technology (AREA)
- Nozzles (AREA)
Abstract
Description
3 シリンダブロック(ワーク)
5 シリンダボア(円形の穴)
5a シリンダボアの内面(被溶射面)
7 溶射粒子(溶融材料)
11 トーチ本体
13 カバー部
13a カバー前面部(外表面部)
17 溶射トーチの吐出口
23 トーチ本体の凹所
23b 凹所の側壁(吐出口周縁部)
25 前面露出部(外表面部の吐出口周縁部に連続する側の端部)
Claims (11)
- ワークの被溶射面に溶融材料を吹き付けて溶射皮膜を形成する溶射トーチであって、
前記溶射トーチは、
前記溶融材料を吐出する吐出口と、
前記吐出口の吐出方向前方側の周縁に位置し、前記溶融材料の吐出方向に沿って形成される吐出口周縁部と、
前記吐出口周縁部の先端側に連続する外表面部と、を有し、
前記吐出口周縁部は、前記外表面部よりも前記溶融材料が付着しやすい部位を備え、
前記外表面部は、前記吐出口周縁部よりも前記溶融材料が付着しにくい部位を備えていることを特徴とする溶射トーチ。 - 前記吐出口周縁部の前記溶融材料が付着しやすい部位は、前記外表面部の前記溶融材料が付着しにくい部位よりも表面の粗さが粗いことを特徴とする請求項1に記載の溶射トーチ。
- 前記外表面部の前記溶融材料が付着しにくい部位は、前記吐出口周縁部の前記溶融材料が付着しやすい部位よりも表面の粗さが細かいことを特徴とする請求項1に記載の溶射トーチ。
- 前記吐出口周縁部の前記溶融材料が付着しやすい部位は、前記外表面部の前記溶融材料が付着しにくい部位よりも熱伝導性が低い材質で構成されていることを特徴とする請求項1ないし3のいずれか1項に記載の溶射トーチ。
- 前記外表面部の前記溶融材料が付着しにくい部位は、前記吐出口周縁部の前記溶融材料が付着しやすい部位よりも熱伝導性が高い材質で構成されていることを特徴とする請求項1ないし3のいずれか1項に記載の溶射トーチ。
- 前記吐出口周縁部の前記溶融材料が付着しやすい部位は、前記外表面部の前記溶融材料が付着しにくい部位よりも前記溶融材料と親和性の高い材質で構成されていることを特徴とする請求項1ないし5のいずれか1項に記載の溶射トーチ。
- 前記外表面部の前記溶融材料が付着しにくい部位は、前記吐出口周縁部の前記溶融材料が付着しやすい部位よりも前記溶融材料と親和性の低い材質で構成されていることを特徴とする請求項1ないし5のいずれか1項に記載の溶射トーチ。
- 前記外表面部は、前記吐出口周縁部に連続する側の端部が、前記外表面部の前記溶融材料が付着しにくい部位よりも、前記溶融材料が付着しやすい面に形成されていることを特徴とする請求項1ないし7のいずれか1項に記載の溶射トーチ。
- 前記吐出口周縁部は、前記外表面部に対して凹所となる部位の側壁で構成され、当該側壁は、前記吐出口の吐出方向前方側が拡がるテーパ形状であることを特徴とする請求項1ないし8のいずれか1項に記載の溶射トーチ。
- 前記溶射トーチは、前記吐出口を有するトーチ本体と、当該トーチ本体を覆いトーチ本体に対して着脱自在のカバー部とを有し、前記カバー部に、前記外表面部の前記溶融材料が付着しにくい部位が設けられていることを特徴とする請求項1ないし9のいずれか1項に記載の溶射トーチ。
- 前記ワークは円形の穴を備えていて、前記被溶射面は前記円形の穴の内面であり、
前記溶射トーチは、前記円形の穴に挿入された状態で回転しながら前記吐出口から溶融材料を吐出するものであり、
前記外表面部の前記溶融材料が付着しにくい部位は、少なくとも前記溶射トーチの回転方向後方側に設けられていることを特徴とする請求項1ないし10のいずれか1項に記載の溶射トーチ。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16895361.0A EP3434804B1 (en) | 2016-03-23 | 2016-03-23 | Thermal spraying torch |
MX2018010459A MX369198B (es) | 2016-03-23 | 2016-03-23 | Antorcha de pulverización térmica. |
PCT/JP2016/059143 WO2017163325A1 (ja) | 2016-03-23 | 2016-03-23 | 溶射トーチ |
JP2018506668A JP6610772B2 (ja) | 2016-03-23 | 2016-03-23 | 溶射トーチ |
US16/087,533 US10500599B2 (en) | 2016-03-23 | 2016-03-23 | Thermal spraying torch |
KR1020187029486A KR102049192B1 (ko) | 2016-03-23 | 2016-03-23 | 용사 토치 |
CN201680083543.1A CN108884547B (zh) | 2016-03-23 | 2016-03-23 | 喷镀炬 |
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PCT/JP2016/059143 WO2017163325A1 (ja) | 2016-03-23 | 2016-03-23 | 溶射トーチ |
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US (1) | US10500599B2 (ja) |
EP (1) | EP3434804B1 (ja) |
JP (1) | JP6610772B2 (ja) |
KR (1) | KR102049192B1 (ja) |
CN (1) | CN108884547B (ja) |
MX (1) | MX369198B (ja) |
WO (1) | WO2017163325A1 (ja) |
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US11465165B2 (en) * | 2017-08-26 | 2022-10-11 | The Boeing Company | High-volume low-pressure end effector |
FR3097788B1 (fr) * | 2019-06-25 | 2022-07-01 | Lisi Automotive | Assemblage de pièces par projection d’une poudre d’un matériau ductile |
DE102019126115A1 (de) * | 2019-09-27 | 2021-04-01 | Gebr. Heller Maschinenfabrik Gmbh | Lichtbogenbrenner und Verfahren zur Beschichtung von Metalloberflächen |
CN112742666A (zh) * | 2020-12-24 | 2021-05-04 | 南京速淘技术研发有限公司 | 一种具有防堵功能的芯片生产设备 |
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- 2016-03-23 KR KR1020187029486A patent/KR102049192B1/ko active IP Right Grant
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KR20180121627A (ko) | 2018-11-07 |
EP3434804A4 (en) | 2019-04-03 |
CN108884547B (zh) | 2019-11-19 |
US20190099770A1 (en) | 2019-04-04 |
MX369198B (es) | 2019-10-31 |
JPWO2017163325A1 (ja) | 2019-01-31 |
KR102049192B1 (ko) | 2019-11-26 |
CN108884547A (zh) | 2018-11-23 |
US10500599B2 (en) | 2019-12-10 |
EP3434804A1 (en) | 2019-01-30 |
EP3434804B1 (en) | 2020-02-12 |
JP6610772B2 (ja) | 2019-11-27 |
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