JP4074708B2 - Electrostatic coating method for metal cylinders - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a static coating capable of forming a thin uniform coating film on the surface of a laminated metal core used for, for example, a rotor of a small motor or a metal cylindrical body such as a magnet. It relates to the electropainting method.
[0002]
[Prior art]
As shown in FIG. 9, a laminated core 1 used for a rotor of a small motor has a shaft hole 2 in the center, and slots 4 along the axial direction are formed in the circumferential direction at predetermined intervals in the circumferential direction. Has been. Moreover, what consists of a magnet of the same shape may be used for a rotor.
[0003]
As a method of performing electrostatic coating on the metal cylindrical body CL such as the laminated iron core 1, electrodeposition coating and electrostatic coating are known. However, the electrodeposition coating has a problem that the equipment is large and the maintenance of the machine is difficult, and the production cost is generally increased.
[0004]
On the other hand, electrostatic coating is an electrostatic coating apparatus comprising a fluid tank having an upper surface opened and a perforated plate disposed on the lower surface, an electrode attached to the perforated plate, and a pressure equalizing chamber surrounding the lower space of the fluid tank. , The resin powder is supplied to the fluid tank, the pressure air is introduced into the pressure equalizing chamber and ejected through the perforated plate, the resin powder in the fluid tank is fluidized, and positive or negative static electricity is applied to the electrode. The resin powder is charged by charging, and the object to be coated, which has been charged with the opposite static electricity to the electrode, is supported above the fluid tank, and the resin powder is adhered to the surface of the object to be coated. Is a method in which the adhered resin powder is fused to form a coating film.
[0005]
[Problems to be solved by the invention]
However, when electrostatic coating is performed on the metal cylindrical body CL such as the laminated core 1, the resin powder is thickly attached to the outer periphery 3 and the end surface 5, but the resin powder is applied to the inner periphery of the shaft hole 2 and the slot 4. Did not adhere sufficiently, and there was a problem that the thickness of the finally formed coating film varied.
[0006]
That is, if a coating film having an appropriate thickness is formed on the inner periphery of the shaft hole 2 or the slot 4, the coating film thickness of the outer periphery 3 becomes too thick and abuts on the inner periphery of the stator. There is a problem that the coating thickness of the end face 5 becomes too thick and the peripheral length of the coil becomes long, and if a coating film having an appropriate thickness is formed on the outer periphery 4 or the end face 5, the shaft hole 2 Further, there is a problem that the coating thickness on the inner periphery of the slot 4 becomes too thin, resulting in poor insulation.
[0007]
Accordingly, an object of the present invention is to provide an electrostatic coating method for a metal cylinder capable of uniformly adhering resin powder to the surface of a metal cylinder such as a laminated iron core used in a rotor of a small motor or the like. Is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the method of electrostatic coating of a metal cylinder of the present invention includes a shaft hole at the center, and a static to a metal cylinder having slots along the axial direction on the outer periphery at predetermined intervals in the circumferential direction. In the electrocoating method, a lid plate having a cross-shaped opening is provided on the upper surface of the resin powder flow tank, and the axial direction of the metal cylinder is positioned above the opening in one direction of the cross of the opening. The metal cylinder is supported toward the end, an annular baffle plate is disposed at a predetermined interval from the end surface of the metal cylinder, and the portion of the opening along the axial direction of the metal cylinder is The metal cylinder has a width shorter than the outer diameter of the metal cylinder and a length longer than the distance between the baffle plates, and the portion of the opening along the direction perpendicular to the axial direction of the metal cylinder is the metal cylinder in the axial width shorter than the length, to have a longer length than the outer diameter, said metal cylinder While rotating, characterized in that the deposition of the resin powder.
[0009]
According to this method, among the resin powder floating from the fluid tank, the one that flows between the end surface of the metal cylinder and the baffle plate adheres to the end surface of the metal cylinder, but flows to the outside of the baffle plate. This is obstructed from adhering to the end face by the baffle plate. On the other hand, in the shaft hole of the metal cylinder, not only the material that flows between the end surface of the metal cylinder and the baffle plate, but also the one that flows outside the baffle plate, Since it flows in, the amount of the resin powder flowing into the shaft hole can be relatively increased.
[0010]
In addition, resin powder that flows between the end surface of the metal cylinder and the baffle plate is prevented from scattering to the surroundings by the baffle plate, so that it easily enters the slot from the end surface side of the metal cylinder body. Become.
[0011]
As a result, the thickness of the resin powder adhering to the end face or outer periphery of the metal cylinder and the thickness of the resin powder adhering to the inner periphery of the shaft hole or slot are averaged to obtain the final coating thickness. Can be made more uniform.
[0013]
Further , since the portion of the cross-shaped opening along the axial direction of the metal cylindrical body extends to the outside of the baffle plate, the resin powder flows outside the baffle plate, and the resin powder flows to the baffle plate. Since it flows into the shaft hole of the metal cylindrical body through the center hole, the amount of resin powder deposited on the inner periphery of the shaft hole can be relatively increased.
[0014]
In addition, since the portion of the cross-shaped opening along the axial direction of the metal cylinder has a width shorter than the outer diameter of the metal cylinder, the resin powder rises at an angle that makes it difficult to enter the slot of the metal cylinder. Reduce the body weight, relatively increase the amount of resin powder rising at an angle that easily enters the slot of the metal cylinder, and make the amount of resin powder adhering to the outer periphery and slot of the metal cylinder more uniform be able to.
[0015]
Furthermore, the portion of the cross-shaped opening along the direction perpendicular to the axial direction of the metal cylinder has a width shorter than the axial length of the metal cylinder and a length longer than the outer diameter. The amount of the resin powder that flows near the end face of the metal can be relatively reduced, and the amount of the resin powder that adheres to the surface of the metal cylinder can be made more uniform.
[0016]
According to a further preferred aspect of the present invention, the metal cylinder is disposed above the fluid tank, and suction means is provided further above and / or to the side of the metal cylinder, and the suction means provides resin powder. To form a flow.
[0017]
According to this aspect, by making the flow of the resin powder by the suction means, the resin powder can be easily attached to a desired location. In particular, when suction means are provided above and to the side of the metal cylinder, when the upper suction means is operated, a strong upward flow is formed, and the resin powder easily flows into the slot. In addition, the resin powder adhering to the end face can be made more uniform. Further, when the side suction means is operated, a flow in the horizontal direction can be formed, and thereby the resin powder can easily flow into the shaft hole or the slot.
[0018]
According to a further preferred aspect of the present invention, a scraping body is disposed in the vicinity of the outer periphery of the metal cylinder, and the thickness of the resin powder adhering to the outer periphery of the metal cylinder is adjusted by the scraping body. .
[0019]
Since the amount of the resin powder adhering to the outer periphery of the metal cylindrical body tends to be formed relatively thick even if various measures as described above are taken, a scraping body is arranged to adhere to the outer periphery. By forcibly scraping off the excess portion of the resin powder, the amount of resin powder adhered can be made more uniform.
[0020]
According to a further preferred aspect of the present invention, the metal cylinder is a laminated iron core, and the metal cylinder is supported via an electrode shaft that is in contact with the inner periphery or the outer periphery of the core in the axial direction.
[0021]
As a problem when electrostatic coating is applied to the laminated iron core, when the resin powder is heated and fused (cured), the air between the laminated plates expands and escapes as bubbles, so pinholes are formed in the coating film, That can cause insulation failure. According to the above aspect, since the resin powder does not adhere to the portion where the electrode shaft abuts, the air between the laminated plates escapes from the portion where the resin powder does not adhere when heated and fused. It is possible to prevent pinholes from being formed.
[0022]
Further, in the above aspect, after the resin powder is attached to the metal cylindrical body, the resin powder is heated and fused to form a coating film, and the coating film is not formed by contacting the electrode shaft. It is preferable to apply and cure a room temperature curable resin on the portion.
[0023]
By applying a room temperature curable resin to the part where the coating film was not formed by contacting the electrode shaft and curing it, the entire surface of the metal cylindrical body was produced without causing problems due to air expansion between the laminated plates. A coating film can be formed.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment as a reference example of the electrostatic coating method of the present invention, FIG. 1 is a front sectional view of an electrostatic coating apparatus used in the method, and FIG. 2 is a main portion of FIG. It is a perspective view.
[0025]
The electrostatic coating apparatus includes a frame body 11 having an upper surface opened, a porous plate 13 covering the lower surface thereof, and a casing 14 disposed on the lower surface of the porous plate 13. 13, a fluid tank 12 to which the resin powder P is supplied and filled is formed, and a pressure equalizing chamber 15 is formed by the porous plate 13 and the housing 14. An air supply port 16 for introducing the pressure air AR into the pressure equalizing chamber 15 is provided at the side of the pressure equalizing chamber 15. A plurality of electrodes 17 are attached to the porous plate 13, and positive or negative static electricity is applied to the resin powder P.
[0026]
The metal cylindrical body CL (specifically, the laminated core 1), which is the object to be coated, is disposed above the fluid tank 12 with the axial direction oriented horizontally, and the pair of electrode shafts 18 are disposed on the inner periphery of the shaft hole 2. Inserted and supported. The electrode shaft 18 is attached to a rotating body 19 to which a voltage opposite to that of the electrode 17 of the perforated plate 13 is applied and is rotated by a driving source (not shown). The electrode shaft 18 is in linear contact with the inner periphery of the shaft hole 2 of the metal cylindrical body CL along the axial direction.
[0027]
Further, in order to restrict the flow of the resin powder P from the flow tank to the left and right end surfaces 5 and 5 of the metal cylinder CL, baffle plates 20 and 21 are arranged in the direction from the left and right end surfaces 5 to the axis C, for example. They are arranged slightly apart by about several mm. The baffle plates 20, 21 have holes 20 b, 21 b in the center and have an annular shape, and have tapered holes 20 a, 21 a through which the electrode shaft 18 is inserted.
[0028]
The electrode shaft 18 includes a stepped portion 18a with which the end surface of the metal cylindrical body CL is engaged, a stepped portion 18b with which the tapered hole 20a of the baffle plate 20 is engaged, and a stepped portion 18c with which the tapered hole 21a of the baffle plate 21 is engaged. These step portions regulate the axial movement of the metal cylinder CL and the baffle plates 20 and 21.
[0029]
In the above-described configuration, the pressure air AR is supplied from the air supply port 16 to the fluid tank 12 through the porous plate 13, the pressure air AR is introduced into the pressure equalizing chamber 15, and ejected through the porous plate 13. The resin powder P is fluidized. Further, the rotating body 19 is rotated to gently rotate the metal cylindrical body CL together with the electrode shaft 18.
[0030]
In this state, when a predetermined voltage is applied between the electrode 17 and the electrode shaft 18, the resin powder P is positively or negatively charged by the electrode 17, and the opposite voltage is applied via the electrode shaft 18. It adheres electrostatically to the metal cylinder CL.
[0031]
In this case, the resin powder P that rises from the fluid tank 12 and flows upward includes (1) what adheres to the outer periphery 3 and the slot 4 of the metal cylinder CL, and (2) the end surface 5 of the metal cylinder CL. There are those that enter the gap between the baffle plate 5 and the baffle plates 20 and 21 and adhere to the end surfaces 5 and 5, and (3) those that flow into the shaft hole 2 of the metal cylinder CL and adhere to the inner periphery thereof.
[0032]
However, the provision of the baffle plates 20 and 21 prevents the resin powder P flowing outside the baffle plates 20 and 21 from adhering to the end surfaces 5 and 5 of the metal cylindrical body CL. The amount of the resin powder P adhering to the layers 5 and 5 is smaller than that when the baffle plates 20 and 21 are not provided.
[0033]
On the other hand, in the shaft hole 2 of the metal cylinder CL, not only the gas that flows into the gap between the end surfaces 5 and 5 of the metal cylinder CL and the baffle plates 20 and 21, but also flows outside the baffle plates 20 and 21. Since the thing which passed the holes 20b and 21b of the baffle plates 20 and 21 also flows in, it does not reduce so much compared with the case where the baffle plates 20 and 21 are not provided.
[0034]
Furthermore, a part of the resin powder P that has flowed into the gap between the end surfaces 5 and 5 of the metal cylinder CL and the baffle plates 20 and 21 is reflected by the inner surfaces of the baffle plates 20 and 21, and the end surface side of the metal cylinder CL To enter slot 4.
[0035]
As a result, the amount of the resin powder entering the shaft hole 2 and the slot 4 is relatively increased as compared with the case where the baffle plates 20 and 21 are not provided, and the resin powder adheres more uniformly to the surface of the metal cylinder CL. It becomes possible to make it.
[0036]
In this way, after the resin powder P is attached to the surface of the metal cylinder CL, the metal cylinder CL is detached from the electrode shafts 18, 18 or the metal cylinder CL is supported by the electrode shafts 18, 18, It heats by putting in a heating furnace or a hot-air drying furnace, the resin powder P is welded, and a coating film is formed.
[0037]
Since the metal cylindrical body CL is supported by the electrode shafts 18 and 18 inserted through the shaft hole 2, the resin powder P does not adhere to the portion of the shaft hole 2 in contact with the electrode shafts 18 and 18. When the metal cylinder CL is the laminated iron core 1, the air between the laminated iron plates expands during the heating and tends to flow out as bubbles, but the expanded air is applied to the electrode shafts 18 and 18. Since the resin powder P comes out from the part where it does not adhere to the film, pinholes and the like can be prevented from occurring in the coating film.
[0038]
In addition, a portion where the electrode shafts 18 and 18 are in contact with each other and no coating film is formed is coated with a room temperature curable resin such as an ultraviolet curable resin and cured, so that the laminated iron plates 1 are laminated. A coating film can be formed on the entire surface of the laminated core 1 without causing problems due to the expansion of air.
[0039]
In this embodiment, the laminated core 1 for the rotor of the small motor is used as the metal cylindrical body CL, but the present invention can also be applied to a magnet having the same shape. The support of the metal cylinder CL by the electrode shaft 18 can also be performed by bringing a plurality of electrode shafts 18 into contact with the outer peripheral portion 3 of the metal cylinder CL. Furthermore, as the resin powder P, for example, a known powder coating material such as polyester and epoxy can be used.
[0040]
3 to 5 show a first embodiment of an electrostatic coating method according to the present invention, FIG. 3 is a front sectional view of an electrostatic coating apparatus used in the method, and FIG. 4 is a view taken along line XX in FIG. 5 is a perspective view of the main part of FIG. Note that substantially the same parts as those in the reference example are denoted by the same reference numerals and description thereof is omitted.
[0041]
Also in the first embodiment, similarly to the reference example , the metal cylinder CL is supported by the electrode shafts 18 and 18, and the flow of the resin powder P is induced near the end surfaces 5 and 5 of the metal cylinder CL. Baffle plates 20 and 21 are provided.
[0042]
A feature of the present invention is that a lid plate 31 having an opening H having a cross shape in a plan view is disposed on the upper surface of the fluidized tank 12. The opening H has a portion A along the axial direction of the cylindrical metal body CL and a portion B along the direction perpendicular to the axial direction. In the portion A along the axial direction, the width W1 is smaller than the outer diameter W of the metal cylinder CL, and the length L1 is longer than the arrangement interval LL between the left and right baffle plates 20 and 21. In the portion B along the direction perpendicular to the axial direction, the width W2 is shorter than the axial length L of the metal cylinder CL, and the length L2 is longer than the outer diameter W of the metal cylinder CL.
[0043]
Therefore, according to the present invention , the portion A along the axial direction of the metal cylinder CL of the cross-shaped opening H extends outside the baffle plates 20, 21. Since the resin powder P flows and the resin powder P flows into the shaft hole 2 of the metal cylindrical body CL through the central holes 20b and 21b of the baffle plates 20 and 21, the resin powder on the inner periphery of the shaft hole 2 is used. The adhesion amount of P can be relatively increased.
[0044]
Moreover, since the portion A along the axial direction of the metal cylinder CL of the cross-shaped opening H has a width shorter than the outer diameter W of the metal cylinder CL, it enters the slot 4 of the metal cylinder CL. The amount of resin powder that rises at a difficult angle (the more difficult it is to enter the slot 4 as it moves away from the center of the metal cylinder CL) is reduced, and the amount of resin powder that rises at an angle that easily enters the slot 4 of the metal cylinder CL is relatively In particular, the amount of the resin powder adhering to the outer periphery 3 and the slot 4 of the metal cylinder CL can be made more uniform.
[0045]
Furthermore, the width W2 of the portion B along the direction perpendicular to the axial direction of the metal cylinder CL of the cross-shaped opening H is shorter than the axial length L of the metal cylinder CL, and the portion B along the direction perpendicular to the axial direction. Since the length L2 of the metal cylinder CL is longer than the outer diameter W of the metal cylinder CL, the amount of the resin powder P flowing near the end faces 5 and 5 of the metal cylinder CL is relatively reduced, and the metal cylinder The amount of resin powder adhering to the end surfaces 5 and 5 of the body CL can be reduced, and the amount of resin powder P adhered as a whole can be made more uniform.
[0046]
In this first embodiment, the metal cylinder CL was tested using a laminated core having an outer diameter W of 20.3 mm, an axial length L of 8.8 mm, and an inner diameter of the shaft hole 2 of 15 mm. The thickness of the shaft hole 2 is 25 to 30 mμ, the outer peripheral portion 3 is 40 μm, the inside of the slot 4 is 36 to 40 μm, and the left and right end surfaces 5 are 50 μm. It has been found that the film thickness is sufficiently uniform as compared with the conventional electrostatic coating method in which the baffle plate 20 and the cover plate 31 are not provided.
[0047]
FIG. 6 is a front sectional view of the electrostatic coating apparatus used in the second embodiment of the electrostatic coating method according to the present invention. Note that substantially the same parts as those in the reference example and the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0048]
Also in the second embodiment, similarly to the first embodiment, the metal cylinder CL is supported by the electrode shafts 18 and 18, and the flow of the resin powder P is induced near the end surfaces 5 and 5 of the metal cylinder CL. Baffle plates 20 and 21 are provided, and a lid plate 31 having a cross-shaped opening H is disposed on the upper surface of the fluid tank 12.
[0049]
The feature of the second embodiment is that suction means 32 and 33 for forcibly forming the flow of the resin powder P from the fluid tank 12 toward the metal cylinder CL in a desired direction are provided. One suction means 32 is disposed above the metal cylinder CL, and the other suction means 33 is disposed on one side of the metal cylinder CL. In the case of this embodiment, the suction means 32, 33 are constituted by a suction cylinder connected to a suction pump (not shown), and any of the suction means 32, 33 is selectively selected by a switching valve arranged in the middle of the suction cylinder. It comes to work.
[0050]
Therefore, when the suction means 32 above the metal cylinder CL is operated, a strong flow is formed straight upward from the fluid tank 12, and the resin powder P easily flows into the slot 4 on the lower surface of the metal cylinder CL. Accordingly, the amount of the resin powder P adhering in the slot 4 is increased, and the flow rate of the resin powder P passing through the vicinity of the end surface 5 of the metal cylindrical body CL is increased, so that the resin powder P adhering to the left and right end surfaces 5 and 5 is increased. And can be deposited with a uniform thickness.
[0051]
Further, when the suction means 33 on the side of the metal cylinder CL is operated, the resin powder P rising from the fluid tank 12 flows to one side along the axial direction of the metal cylinder CL. The body P easily flows into the shaft hole 2 or the slot 4, and the amount of the resin powder P adhering to the shaft hole 2 or the slot 4 can be increased. In this case, the metal cylinder CL is moved with respect to the fluid tank 12 or the opening H of the lid body 31 is moved so that the position of the metal cylinder CL is sucked from directly above the fluid tank 12. If it moves relatively in the direction of 33, the flow can be formed more effectively.
[0052]
FIG. 7 is a perspective view showing a third embodiment of the electrostatic coating method of the present invention. It should be noted that substantially the same parts as those in the reference example and the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.
[0053]
The feature of the third embodiment is that a scraping body 34 for the resin powder P is provided in the vicinity of the outer periphery 3 of the metal cylinder CL supported by the electrode shaft 18. As the scraping member 34, a spatula-shaped plate made of synthetic resin is employed in this embodiment, but a roller, a brush, or the like may be used. The gap T between the scraping body 34 and the outer periphery 3 of the cylindrical metal body CL may be set as appropriate according to the desired thickness of the resin powder P, but usually the desired coating thickness. Is preferably several times as large as.
[0054]
In this embodiment, when the excessively thick resin powder P adheres to the outer periphery 3 of the metal cylindrical body CL, the excess resin powder P is scraped off by the scraping body 34. The resin powder P having an appropriate thickness can always be adhered. In this embodiment, the tip edge 34a of the scraping plate 34 is brought into contact with the outer peripheral portions of the baffle plates 20 and 21 to define the gap T between the scraping body 34 and the outer periphery 3 of the metal cylindrical body CL. .
[0055]
FIG. 8 is a front sectional view of an electrostatic coating apparatus used in the fourth embodiment of the electrostatic coating method according to the present invention. It should be noted that substantially the same parts as those of the reference example and the first to third embodiments are denoted by the same reference numerals, and the description thereof will be omitted.
[0056]
As shown in FIG. 3, the feature of the fourth embodiment is that the metal cylinder CL is supported so that its axial direction is in the horizontal direction, and the resin powder P is adhered by the same method as in the above embodiment. Then, as shown in FIG. 8, the support angle of the metal cylinder CL is changed so that its axial direction is in the vertical direction.
[0057]
That is, when the metal cylinder CL is supported so that its axial direction is vertical, the resin powder P rising from the fluidized tank 12 easily enters the shaft hole 2 and the slot 4 of the metal cylinder CL, and the shaft The thickness of the coating film in the hole 2 or the slot 4 can be increased.
[0058]
【The invention's effect】
As described above, according to the present invention, the annular baffle plate is arranged at a predetermined interval from the end face of the metal cylinder, and the resin powder is adhered while rotating the metal cylinder. The thickness of the resin powder that adheres to the end face and outer periphery of the metal cylinder and the thickness of the resin powder that adheres to the inner periphery of the shaft hole and slot are averaged, resulting in a more uniform coating thickness. Can be.
[0059]
In addition , by providing a cover plate having a cross-shaped opening on the upper surface of the fluid tank, the amount of resin powder flowing into the shaft hole and slot of the metal cylindrical body is relatively increased, and the thickness of the coating film is increased. Can be made more uniform.
[0060]
In a further preferred aspect of the present invention, when suction means is provided further above and / or to the side of the metal cylindrical body, the resin powder is formed at a desired location by creating a forced flow of the resin powder by the suction means. The powder can be easily adhered.
[0061]
In a further preferred aspect of the present invention, when the scraping body is disposed in the vicinity of the outer periphery of the metal cylinder, the scraping body forcibly removes the excess portion of the resin powder adhering to the outer periphery of the metal cylinder. By scraping off, the adhesion amount of the resin powder can be made more uniform.
[0062]
In a further preferred aspect of the present invention, when the metal cylindrical body is a laminated iron core and is supported via an electrode shaft that is in contact with the inner periphery or outer periphery of the laminated core, Since the resin powder does not adhere, when the resin powder is heated and fused, it is possible to prevent the air between the laminated plates from coming off from the portion where the resin powder is not adhered and making a pinhole in the coating film. .
[0063]
Furthermore, in the above aspect, if a room temperature curable resin is applied and cured on the part where the coating film is not formed by contacting the electrode shaft, there is no problem due to the expansion of air between the laminated plates. A coating film can be formed on the entire surface.
[Brief description of the drawings]
FIG. 1 is a front sectional view of an electrostatic coating apparatus used in an embodiment serving as a reference example of the electrostatic coating method of the present invention.
FIG. 2 is a perspective view of the main part of FIG.
FIG. 3 is a front sectional view of the electrostatic coating apparatus used in the first embodiment of the electrostatic coating method of the present invention.
4 is a view taken in the direction of arrows X-X in FIG. 3;
FIG. 5 is a perspective view of a main part of FIG. 3;
FIG. 6 is a front sectional view of an electrostatic coating apparatus used in a second embodiment of the electrostatic coating method of the present invention.
FIG. 7 is a perspective view showing a third embodiment of the electrostatic coating method of the present invention.
FIG. 8 is a front sectional view of an electrostatic coating apparatus used in a fourth embodiment of the electrostatic coating method of the present invention.
FIG. 9 is a perspective view of a laminated iron core as an example of a metal cylinder that is an object to be coated.

Claims (5)

In the electrostatic coating method on a metal cylinder having a shaft hole in the center and slots along the axial direction on the outer periphery at predetermined intervals in the circumferential direction,
Provide a cover plate with a cross-shaped opening on the top surface of the resin powder flow tank ,
Above the opening, the metal cylinder is supported with the axial direction of the metal cylinder facing one direction of the cross of the opening, and an annular shape is spaced from the end surface of the metal cylinder. Place baffle plates,
The portion of the opening along the axial direction of the metal cylinder has a width shorter than the outer diameter of the metal cylinder and a length longer than the distance between the baffle plates, and the metal of the opening The portion along the direction perpendicular to the axial direction of the cylindrical body has a width shorter than the axial length of the metal cylindrical body and a length longer than the outer diameter,
An electrostatic coating method for a metal cylinder, wherein the resin powder is adhered while rotating the metal cylinder. While placing the metal cylinder above the fluidization vessel, a suction means provided in the further upward and / or the side of the metal cylinder, according to claim 1 wherein a flow of the resin powder by the suction means Electrostatic coating method for metal cylinders. The metal cylinder according to claim 1 or 2 , wherein a scraping body is disposed in the vicinity of the outer periphery of the metal cylinder, and the thickness of the resin powder attached to the outer periphery of the metal cylinder is adjusted by the scraping body. Body electrostatic painting method. It said metal cylinder has a laminated iron core, through the inner peripheral or the electrode shaft is brought into contact in the axial direction on the outer circumference, according to any one of claims 1-3 for supporting the metal cylinder Electrostatic coating method for metal cylinders. After the resin powder is adhered to the metal cylindrical body, the resin powder is heat-fused to form a coating film, and the room temperature curing type is formed on the portion where the coating film is not formed by contacting the electrode shaft. The method of electrostatic coating of a cylindrical metal body according to claim 4, wherein a resin is applied and cured.

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