US20100065662A1 - Thermal spraying apparatus - Google Patents

Thermal spraying apparatus Download PDF

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Publication number
US20100065662A1
US20100065662A1 US12/531,901 US53190108A US2010065662A1 US 20100065662 A1 US20100065662 A1 US 20100065662A1 US 53190108 A US53190108 A US 53190108A US 2010065662 A1 US2010065662 A1 US 2010065662A1
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United States
Prior art keywords
spray
discharge opening
spray gun
bore
bore surface
Prior art date
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Abandoned
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US12/531,901
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English (en)
Inventor
Kota Kodama
Noritaka Miyamoto
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Toyota Motor Corp
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Individual
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Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIYAMOTO, NORITAKA, KODAMA, KOTA
Publication of US20100065662A1 publication Critical patent/US20100065662A1/en
Abandoned legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
    • 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
    • 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
    • B05B7/0075—Nozzle arrangements in gas streams
    • 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
    • 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
    • C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
    • C23C4/16—Wires; Tubes
    • 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

Definitions

  • the present invention relates to a thermal spraying apparatus that forms a spray coating on an inner circumferential surface of a cylinder bore of an engine and the like.
  • This adhesion of the reflected particles and spray fumes is such that when the spray gun is moved from the upper end of the bore (the end portion of the cylinder bore that faces the outside of the cylinder block) to the lower end of the bore (the end portion of the cylinder bore that faces the inside of the cylinder block), they adhere to an unsprayed surface of the bore surface on the lower side. When the spray gun is moved from the lower end of the bore to the upper end, they adhere to an unsprayed surface of the bore surface on the upper side. As a result of the adhesion of the reflected particles and spray fumes to an unsprayed surface of the bore surface, there arise problems where the bond strength of the spray particles at the unsprayed surface drops significantly, and the smoothness of the bore surface is compromised.
  • the thermal spraying method and thermal spraying apparatus of Patent Document 2 are an apparatus whose object is to prevent reducing operating efficiency resulting from the attachment/detachment of a masking member in a conventional thermal spraying apparatus that uses a masking member in order to prevent the adhesion of spray particles to parts where coating is unneeded.
  • spraying is performed while moving a spray gun in the axial direction within a cylinder in a state where the spray direction of the spray material from the spray gun is so inclined that the spray angle formed between this spray direction and the inner surface of the cylinder is an acute angle.
  • the spray angle in the vicinity of the end portions of the inner surface of the cylinder in the axial direction is made greater than the spray angle at other regions.
  • the thermal spraying method of Patent Document 3 is one in which, at the lower half portion of the outer circumferential surface from a lower opening portion of a rotating hollow cylindrical tube, compressed air is blown against a recessed portion that is circumferentially provided in the shape of a ring in a plane that is parallel to the plane of the opening end, thereby causing an air flow that ascends along the inner circumferential surface, and removing unmelted particles and fumes adhered to the inner circumferential surface.
  • Patent Document 1
  • Patent Document 2
  • the operation of attaching/detaching a masking member can be eliminated. However, it merely adjusts the spray angle. With this configuration, the adhesion of reflected particles and spray fumes to an unsprayed surface of a bore surface cannot be prevented completely.
  • the thermal spraying method of Patent Document 3 although fumes adhered to a bore surface may be removed, it does not go so far as to prevent the adhesion of fumes and the like.
  • the present invention is made in view of the problems mentioned above. Its object is to provide a thermal spraying apparatus that is capable of, with a simple apparatus configuration, effectively preventing the adhesion of reflected particles and spray fumes to a cylinder bore surface during spraying.
  • a thermal spraying apparatus is a thermal spraying apparatus that forms an arc spray coating on a cylinder bore surface characterized in that: the thermal spraying apparatus at least comprises rotation control means, movement control means, and a spray gun that is rotated by the rotation control means and that has at one end thereof a first discharge opening facing a direction that is orthogonal to the movement direction of the spray gun and that further has a second discharge opening facing a direction that is orthogonal to the direction that the first discharge opening faces; in the spray gun, a third discharge opening for discharging a fluid and that faces the same direction as the first discharge opening is provided at a predetermined region that is located further to the side in the movement direction of the spray gun than the first discharge opening; atomizing air is discharged from the first discharge opening and auxiliary air is discharged from the second discharge opening; and when the first discharge opening moves from one end side of the cylinder bore to the other end side by means of the movement control means while the spray gun is in a rotating posture by means of
  • a thermal spraying method that is realized by applying a thermal spraying apparatus of the present invention is directed towards arc spraying.
  • wire materials for the arc spray wire material wire materials made of metals, such as iron, aluminum, zinc, titanium, molybdenum, and the like, alloys, such as tin-zinc alloys, nickel-aluminum alloys, nickel-chromium alloys, and the like, ceramic powders, such as alumina, zirconia, and the like, stellite alloys, chromium-iron alloy powders, and the like may be used.
  • a thermal spraying apparatus of the present invention is suited for use in forming an arc spray coating on the inner circumferential surface of a cylinder bore of an engine and the like.
  • it may naturally be applied to arc spraying onto internal surfaces of appropriate tubular members for which it is necessary to improve the wear-resistance and the like thereof, such as the sliding surface of a cylinder constituting a cylinder unit mechanism that is an actuator.
  • two pieces of spray wire material are short-circuited with each other's tips to generate an arc, and a droplet of the spray wire material is formed.
  • compressed auxiliary air is discharged from the second discharge opening from the tip of the spray gun.
  • atomizing air that travels towards the bore surface is discharged from the first discharge opening.
  • spray particles are formed, and these spray particles are sprayed onto the bore surface.
  • the wires are supplied by an appropriate feeding mechanism so that the wires, which are consumed as the spraying process proceeds, can maintain a positional relationship where their tips are contiguous with each other.
  • the thermal spraying apparatus comprises the rotation control means that controls the rotation of the spray gun, and the movement control means that controls the ascent/descent of the spray gun in the axial center direction of the bore.
  • the spray gun may be lowered to the lower end of the bore, be rotated after having the frame stabilized at the lower end of the bore, and ascend once within the bore at a predetermined speed while maintaining this posture, thus forming a spray coating on the bore surface. It is noted that it may also naturally be a method of forming a spray coating while having the spray gun of a rotating posture ascend and descend a plurality of times within the bore.
  • the third discharge opening for discharging a fluid such as compressed air or the like is further formed at a predetermined region on the side towards the movement direction of the spray gun. In synchrony with the spraying of the spray particles onto the bore surface, the fluid is discharged towards the bore surface from this third discharge opening as well.
  • the third discharge opening is provided further above (upper end side of the bore) than the first and second discharge openings formed at the lower end of the spray gun. As the spray particles are sprayed at the lower side, compressed air is blown from thereabove.
  • the thermal spraying apparatus also comprises an extraction apparatus that is internally placed in the cylinder block, and thermal spray processing is conducted while extracting spray fumes from the lower end side of the bore, it is possible to further enhance the effect of preventing spray fumes from adhering to unsprayed regions.
  • a preferred embodiment of a thermal spraying apparatus is characterized in that, in the above-mentioned thermal spraying apparatus, the distance from the deposition center of the arc spray coating, which is sprayed and deposited on the above-mentioned bore surface, to the intersection between the axial center line extending from the above-mentioned third discharge opening and the bore surface is set within a range of 10 to 40 mm.
  • the spray direction of the spray particles actually sprayed onto the bore surface by the atomizing air blown from the first discharge opening and the auxiliary air blown from the second discharge opening is in a direction that is inclined downward by a predetermined angle from a direction that is orthogonal (the direction of the normal line to the bore surface which is the horizontal direction) to the movement direction (for example, the vertical direction) of the spray gun.
  • the angle at which the spray particles are actually sprayed onto the bore surface is a region that is below the horizontal direction. This region is dependent on the blowing pressures of the auxiliary air and the atomizing air, the separation between the first discharge opening and the bore surface, and further on the movement speed of the spray gun.
  • the spray gun when the spray gun is moved upward at a predetermined movement speed, the auxiliary air and the atomizing air discharged at predetermined pressures, and further a predetermined separation set between the first discharge opening and the bore surface, and in embodiments in which the distance from the deposition center of the arc spray coating, which is formed by spraying spray particles, to the intersection between the axial center, which extends from the third discharge opening, and the bore surface is separated by 10 to 40 mm, it has been verified that the bond strength of the coating, specifically the bond strength at above the sprayed region of interest (the spray coating of the region on which spray coating is to be formed later), exhibits a high strength exceeding a predetermined reference value.
  • a thermal spraying apparatus of the present invention the adhesion of spray fumes to unsprayed regions of the bore surface during arc spraying can be prevented effectively. As a result, high bond strength can be secured between the spray coating and the bore surface. Therefore, it leads to an improvement in the durability of the cylinder block.
  • FIG. 1 is a schematic view showing a thermal spraying apparatus of the present invention.
  • FIG. 2 is an enlarged view of a spray gun.
  • FIG. 3 is a view of FIG. 2 in the direction of arrow III-III.
  • FIG. 4 is a view illustrating a state in which a spray gun is spraying spray particles onto a cylinder bore surface, and is also a view illustrating the region, where the axial center of a third discharge opening intersects the bore surface, and a deposition center of the spray particles.
  • FIG. 5 is a graph showing experiment results relating to the distance between the region, where the axial center line of a fume adhesion prevention nozzle (third discharge opening) intersects the bore surface, and a deposition center of the spray particles, and to the bond strength of the spray coating above the deposition center.
  • FIG. 6 is optical microscope images of cross sections of the boundary between a bore surface and a spray coating where (a) is a view showing an image of a comparative example, and (b) is a view showing an image of a working example.
  • 1 denotes a base, 2 a support portion, 3 a spray tool, 4 a controller, 51 an ascent/descent drive motor, 52 a rotation drive motor, 6 a spray gun, 61 a tip member, 62 an atomizing nozzle (first discharge opening), 63 an auxiliary nozzle (second discharge nozzle), 64 side pieces, 65 fume adhesion prevention nozzles (third discharge openings), 7 a palette, 10 a thermal spraying apparatus, C a cylinder block, C 1 a bore, A 1 auxiliary air, A 2 atomizing air, and A 3 fume adhesion prevention air.
  • FIG. 1 is a schematic. view showing a thermal spraying apparatus of the present invention.
  • FIG. 2 is an enlarged view of a spray gun.
  • FIG. 3 is a view of FIG. 2 in the direction of arrow III-III.
  • FIG. 4 is a view illustrating a state in which a spray gun is spraying spray particles onto a cylinder bore surface, and is also a view illustrating the region, where the axial center of a third discharge opening intersects the bore surface, and a deposition center of the spray particles.
  • FIG. 1 is a schematic. view showing a thermal spraying apparatus of the present invention.
  • FIG. 2 is an enlarged view of a spray gun.
  • FIG. 3 is a view of FIG. 2 in the direction of arrow III-III.
  • FIG. 4 is a view illustrating a state in which a spray gun is spraying spray particles onto a cylinder bore surface, and is also a view illustrating the region, where the axial center of a third discharge opening intersects the bore surface
  • FIG. 5 is a graph showing experiment results relating to the distance between the region, where the axial center line of a third discharge opening intersects the bore surface, and a deposition center of the spray particles, and to the bond strength of the spray coating above the deposition center.
  • FIG. 6 is optical microscope images of cross sections of the boundary between a bore surface and a spray coating.
  • FIG. 1 is a schematic view of an embodiment of a thermal spraying apparatus that is used in forming an arc spray coating of the present invention on the inner surface of a bore of a cylinder block.
  • This thermal spraying apparatus 10 substantially comprises: a base 1 ; a support portion 2 that is supported by and fixed to the base 1 ; a spray tool 3 that slides up and down along the support portion 2 ; a spray gun 6 that is installed at the tip of this spray tool 3 ; a controller 4 ; and a palette 7 that a cylinder block C is to be placed on and fixed to.
  • the support portion 2 is placed on the base 1 , and supports a slider 31 , which is provided on the spray tool 3 , in a freely ascendible/descendible manner.
  • the controller 4 is connected to an ascent/descent drive motor 51 , which is installed on the upper portion of the support potion 2 , and a rotation drive motor 52 .
  • a helical screw 32 is attached to a rotary shaft of the ascent/descent drive motor 51 .
  • the helical screw 32 is mated with a support 33 that is fixed to the slider 31 .
  • the controller 4 controls the rotation direction and rotation speed of the ascent/descent drive motor 51 .
  • the spray tool 3 is able to ascend and descend at a desired speed by means of the rotation of the ascent/descent drive motor 51 .
  • a rotation control portion which rotates the spray gun 6 at a predetermined speed
  • a movement control portion which causes the spray gun 6 to ascend and descend at a predetermined speed
  • a spray control portion which synchronously blows atomizing air, auxiliary air, and fume adhesion prevention air, which are later described, are built into the controller 4 . Subsequent rotation, movement, and spraying are automatically controlled by having the movement speed and rotation speed of the spray gun input by an administrator.
  • a tool main body 34 of the spray tool 3 has the spray gun 6 installed on its tip.
  • the tool main body 34 and the spray gun 6 rotate about their axes (direction Y in the figure) by means of the rotation drive motor 52 .
  • the palette 7 is installed on the base 1 , and fixates the cylinder block C placed thereon.
  • spray particles are sprayed onto the bore surface of the bore C 1 .
  • the cylinder block C is formed from an aluminum alloy casting, and JISAC2C, ADC12 and the like, for example, may be used.
  • FIG. 2 is an enlarged view of the spray gun 6
  • FIG. 3 is a side view thereof.
  • a voltage is applied to power lines not shown in the figures.
  • An arc is generated at the tip contact portion of arc spray wire materials (wires W). Due to the heat therefrom, the tips of the wires W melt.
  • the wires W of an amount that has been melted and consumed is drawn out and fed from a reel by means of rotation of a feed roller not shown in the figures.
  • auxiliary air A 1 blows out from an auxiliary nozzle 63
  • atomizing air A 2 blows from an atomizing nozzle 62 provided in a tip member 61 of the spray gun 6 (see FIG. 3 ).
  • FIG. 2 also schematically shows a state where the tips of the wires W have melted, and the auxiliary air A 1 , which is compressed air, is blown out from the auxiliary nozzle 63 .
  • the auxiliary air A 1 is blown onto a droplet W 1 into which the wires W have melted.
  • the droplet W 1 deforms in such a manner that it is stretched downward.
  • side pieces 64 , 64 are installed on both sides of the tip member 61 .
  • a fume adhesion prevention nozzle 65 which faces the same direction as the atomizing nozzle 62 , is provided in each side piece 64 . From FIG. 2 , the fume adhesion prevention nozzles 65 are located further above in the movement direction of the spray gun 6 than the atomizing nozzle 62 .
  • the atomizing air A 2 that is blown from the atomizing nozzle 62 is blown onto the droplet W 1 .
  • the droplet W 1 is dispersed into fine spray particles W 2 , . . . .
  • the spray particles W 2 , . . . are sprayed onto the inner surface of the bore C 1 .
  • the sprayed spray particles W 2 , . . . adhere to the inner surface of the bore C 1 to form a spray coating.
  • fume adhesion prevention air A 3 is discharged towards the bore surface from the fume adhesion prevention nozzles 65 , which face the same direction as the atomizing nozzle 62 , at further above than the atomizing nozzle 62 (above in the movement direction of the spray gun 6 ).
  • the spray particles W 2 , . . . and the fume adhesion prevention air A 3 are so controlled as to be sprayed synchronously.
  • FIG. 4 is a view illustrating a region, where the axial center of the third discharge openings (the fume adhesion prevention nozzles 65 ) intersects the bore surface, and a deposition center of sprayed particles.
  • the fume adhesion prevention air A 3 that is blown in synchrony with the spraying of the spray particles W 2 , . . . is so arranged as to be blown towards a region that is separated from the above-mentioned deposition center P 1 in the upper direction by a distance:L (the distance to the intersection:P 2 between the axial center line, which extends from the fume adhesion prevention nozzles 65 , and the bore surface).
  • a distance:L the distance to the intersection:P 2 between the axial center line, which extends from the fume adhesion prevention nozzles 65 , and the bore surface.
  • the present inventors conducted experiments for determining the optimum range for the distance:L indicated in FIG. 4 , and identified a range for the above-mentioned distance:L in which a high bond strength can be obtained between a spray coating and a bore surface in cases where the spray coating is formed while moving a spray gun from the lower end of the bore to the upper end.
  • the specific contents of the experiments were: a die-cast aluminum alloy cylinder block with an inner diameter: ⁇ of 88 mm was manufactured, and an arc spray coating was formed on the bore surface thereof.
  • a shot blasting process was performed using alumina grits of #20 blasting particles and under a condition where the air pressure was 5 kg/cm 2 , so that the surface roughness of the bore surface would be 60 Rz.
  • fume adhesion prevention air was discharged with the air pressure set to 0.8 MPa while varying the above-mentioned distance:L within 0 to 60 mm.
  • An arc was generated 50 mm above the upper end of the bore.
  • the spray gun was not rotated, and the frame was stabilized in 4 seconds. Then, the spray gun was moved to 30 mm below the lower end of the bore at 100 mm/sec. Then, spraying was performed while the spray gun rotated at 200 rpm, and ascended one pass (only once) at pull-up speed: 6 mm/sec.
  • spraying was performed using a wire of Fe—0.4% C—1% Mn—8% Cr and of ⁇ 1.6 mm (the respective constituents are in weight %) for the arc spray wire material, the applied voltage being 30 V, and while spray fumes were extracted at extraction speed: 8 m/sec from the lower end of the bore using a pipe of ⁇ 80 mm. Further, the discharge pressure of the atomizing air during spraying is set to 0.7 MPa and the discharge pressure of the auxiliary air to 0.7 MPa, and the separation between the atomizing nozzle and the bore surface was set to 50 mm.
  • the present inventors took SEM images at the boundary region between the spray coating and the bore surface in each case of a thermal spraying apparatus in which distance:L was set to 30 mm (working example), which is within the above-mentioned range, and of a thermal spraying apparatus in which L was made 0 mm (comparative example).
  • the images are shown in FIG. 6 .
  • FIG. 6 a shows the comparative example
  • FIG. 6 b shows the working example.
  • FIG. 6 a From. FIG. 6 a , it can be seen that many pores exist at the boundary between the bore surface and the spray coating in the comparative example. It can be determined that the pores result from spray fumes and the like.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electromagnetism (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Nozzles (AREA)
US12/531,901 2007-03-26 2008-03-06 Thermal spraying apparatus Abandoned US20100065662A1 (en)

Applications Claiming Priority (3)

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JP2007-078595 2007-03-26
JP2007078595A JP4725543B2 (ja) 2007-03-26 2007-03-26 溶射装置
PCT/JP2008/054553 WO2008126608A1 (ja) 2007-03-26 2008-03-06 溶射装置

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EP (1) EP2130939B1 (ja)
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CN104128284A (zh) * 2013-05-03 2014-11-05 苏舍美特科公司 用于加工工件表面的加工装置
US20160082464A1 (en) * 2013-11-26 2016-03-24 Akebono Brake Industry Co., Ltd. Insulated support tool
CN110201856A (zh) * 2019-06-05 2019-09-06 龙马铝业集团有限公司 一种铝板铸轧辊表面处理方法及处理装置
US20200164396A1 (en) * 2017-09-07 2020-05-28 Ihi Corporation Device for coating cylinder
CN111715489A (zh) * 2020-07-01 2020-09-29 矿冶科技集团有限公司 大尺寸筒形件可磨耗涂层喷涂方法
DE102010045314B4 (de) * 2010-09-14 2021-05-27 Bayerische Motoren Werke Aktiengesellschaft Thermisches Beschichtungsverfahren
CN113265648A (zh) * 2021-04-01 2021-08-17 邱海楚 一种一体式粉末气相沉积喷涂装置

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