JP2002273284A - Holding tool for annular material to be coated, setting tool and pull-out tool and electrostatic powder coating method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding tool or the like for holding an annular material to be coated with only one kind of the tool. SOLUTION: The holding tool 10 for holding the annular material 26 to be coated on the inner circumference is provided with a rod like main body 11 having the outside diameter smaller than the inside diameter of the annular material to be coated and a plurality of flexible holding pawls 14 arranged along the outer circumference of the rod like main body almost in the same axial direction positional and each connected to the rod like main body at the base end part, and the tip part of each holding pawl in a free state is positioned outside in the diameter direction from the inner circumferential position of the annular material to be coated. The annular material 26 to be coated is set and pulled out to and from the holding tool 10 with the setting tool 17 and the pull-out tool 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding jig for holding an annular workpiece during electrostatic powder coating of an annular workpiece such as a stator core of a motor. The present invention relates to a set jig for setting, a jig for extracting an annular object to be coated from the holding jig after coating, and an electrostatic powder coating method using each jig.

[0002]

2. Description of the Related Art As shown in FIG. 12, conventionally, when a stator core 1 of a motor is subjected to electrostatic powder coating, first and second holding jigs 2, 3 are used as holding jigs for holding the stator core 1. Are known (Japanese Unexamined Patent Application Publication No.
000-334336). That is, the first holding jig 2 has L projecting outward from the inner periphery of the cylindrical portion 2a.
A plurality of flexible holding claws 2b bent in a character shape are provided, and the tip of each holding claw 2b is located radially inward of the inner periphery of the stator core 1 in a free state.

On the other hand, the second holding jig 3 is provided with two-stage connecting rods 3a and 3b. As shown in FIG. 14, the connecting rods 3a and 3b are connected to the cylinder through the inside of each holding claw 2b. The first and second holding jigs 2 and 3 are connected by fitting into the inner periphery of the shape 2a, and the large-diameter connecting rod 3
b pushes each holding claw 2b radially outward and expands the holding claw 2a.
Are engaged with the inner periphery of the stator core 1 to hold the stator core 1.

[0004] Reference numerals 2c and 3c denote transfer rods provided on the holding jigs 2 and 3 for transfer on a conveyor of an electrostatic powder coating apparatus (not shown).
After the first and second holding jigs 2 and 3 holding the first and second holding jigs 2 and 3 are placed on the conveyor and the surface of the stator core 1 is subjected to electrostatic powder coating, the first and second holding jigs 2 and 3 are separated. Then, the painted stator core 1 is taken out.

[0005]

However, in the above configuration, the first and second holding jigs 2 and 3 are combined to hold the stator core 1, so that the number of stator cores 1 to be simultaneously coated is equal to the number of stator cores 1 to be coated. However, only the first and second holding jigs 2 and 3 are required, and the number of necessary holding jigs is increased as a whole, and the cost is increased.

Further, if the connection between the first holding jig 2 and the second holding jig 3 is loosened on the electrostatic powder coating apparatus, the stator core 1 may be eccentric with respect to the holding claw 2b. As a result, it becomes impossible to stably hold the stator core 1 by the holding claws 2b. As a result, there is a problem that the quality of the coating of the stator core 1 is deteriorated.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a holding jig capable of holding an annular workpiece with only one kind of jig, and setting the annular workpiece on the holding jig. It is an object of the present invention to provide a set jig for removing the jig, a jig for extracting an annular workpiece from a holding jig after coating, and an electrostatic powder coating method using each jig.

Therefore, the annular jig holding jig according to the first aspect of the present invention is a holding jig for holding the annular coated object at an inner periphery thereof, and has an outer diameter smaller than the inner diameter of the annular coated object. A rod-shaped main body having a plurality of flexible holding claws arranged along the outer periphery of the rod-shaped main body at substantially the same axial position and having respective base ends connected to the rod-shaped main body. In the free state, the tip of the holding claw is located radially outward from the inner circumferential position of the annular workpiece.

A holding jig for an annular object to be coated according to a second aspect of the present invention is the rod-shaped jig of the first aspect, wherein the holding claw and the end of the rod-shaped main body corresponding to the tip end side of the holding claw are provided. A weight portion having a larger diameter than the rod-shaped main body is provided on the outer periphery of the main body.

[0010] The annular jig set jig of claim 3 is:
3. A substantially vertical first insertion hole having an inner diameter larger than the outer diameter of the rod-shaped body and smaller than the outer diameter of the annular workpiece in the holding jig according to claim 1 or 2, and near the upper end of the first insertion hole. A support hole having an inner diameter substantially equal to the outer diameter of the annular object to be coated, which is provided substantially concentrically, wherein the depth of the first insertion hole is equal to the tip of each of the holding claws and the depth of the holding claw. The distance is not less than the distance between the base end and the end of the rod-shaped main body corresponding to the base end.

According to a fourth aspect of the present invention, there is provided a jig for removing an annular workpiece having a substantially vertical direction having an inner diameter larger than the outer diameter of the rod-shaped body and smaller than the inner diameter of the annular workpiece in the holding jig according to the first or second aspect. Wherein the depth of the second insertion hole is equal to or greater than the distance between each of the holding claws and the end of the rod-shaped body corresponding to the base end side of the holding claw. It is assumed that.

According to a fifth aspect of the present invention, there is provided the electrostatic powder coating method for an annular workpiece, after the annular workpiece is disposed in the support hole of the set jig according to the third aspect, and then the holding jig according to the first or second aspect. Is inserted from the end corresponding to the base end side of the holding claw into the first insertion hole through the inner periphery of the annular object to be coated, and each of the holding claws is inserted at the inner periphery of the annular object to be coated. By pressing and shrinking in the radial direction, the tip of each holding claw is engaged with the inner periphery of the annular workpiece to hold the annular workpiece by the holding jig,
Subsequently, the holding jig is detached from the first insertion hole of the set jig, and the annular workpiece is placed on the electrostatic powder coating apparatus together with the holding jig. After the body coating is performed, the rod-shaped main body of the holding jig holding the painted ring-shaped object to be coated is moved from the end corresponding to the base end side of the holding claw to a position corresponding to the end of the jig according to claim 4. (2) Inserting into the insertion hole and pressing each holding claw radially inward with the second insertion hole, thereby detaching the tip of each holding claw from the inner periphery of the painted annular workpiece to be coated. It is assumed that.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1A, the holding jig 10 includes a substantially cylindrical rod-shaped main body 11, and three grooves extending along the axial direction are provided near an intermediate portion of the rod-shaped main body 11 in the axial direction. Numerals 12 are formed at substantially equal intervals in the circumferential direction of the rod-shaped main body 11, that is, at intervals of about 120 °. As shown in FIG. 1B, which is a cross-sectional view along the line II in FIG. 1A, a screw hole 13 is formed near one end of each groove 12.

In each groove 12, a flexible holding claw 1 is provided.
4 is disposed along the axial direction of the rod-shaped main body 11, and the base end 14 a of the holding claw 14 is screwed into the screw hole 13.
5 is fixed to the rod-shaped main body 11. In FIG. 1B, the holding claws 14 and the screws 15 are not shown. As shown in FIGS. 2 (a) and 2 (b), the holding claw 14 is formed in a substantially tapered shape in which a region from the center portion to the tip portion 14b gradually narrows at the tip end side when viewed from above. When viewed from above, it has a shape that is bent obliquely upward in two steps.

In the free state of FIG. 1, the tip of the holding claw 14 is located radially outward from an inner peripheral position (see a virtual line A) of a stator core 26 described later. A cylindrical weight 16 (weight portion) is fitted between an end (left end in FIG. 1) of the rod-shaped main body 11 on the side corresponding to the tip 14 b of the holding claw 14 and the holding claw 14. Has been fixed. In the vicinity of the end of the weight 16 on the holding claw 14 side, a tapered surface whose diameter is gradually reduced is formed.

FIGS. 3A and 3B show the setting jig 17. The set jig 17 is a substantially columnar member, and has a first section having a circular cross section from the upper end to the lower end near the center in the radial direction.
An insertion hole 18 is formed. Furthermore, the first insertion hole 1
8, via a tapered portion 20 that gradually decreases in diameter,
The air hole 21 having a smaller diameter than the first insertion hole 18 is
Is formed so as to extend to the lower end face.

The first insertion hole 18 is larger than the outer diameter of the rod-shaped main body 11 in the holding jig 10 and is
6 and an inner diameter smaller than the outer diameter of the holding claws 14, the depth D 1 of the first insertion hole 18 is different from that of the holding claws 14.
Of the rod-shaped main body 11 (the right end in FIG. 1) corresponding to the base end side of FIG.

In the vicinity of the upper end surface of the set jig 17,
The support hole 22 is located adjacent to the upper end of the first insertion hole 18.
It is provided concentrically with the insertion hole 18. This support hole 22
Has an inner diameter slightly smaller than the outer diameter of the stator core 26.

As shown in FIGS. 4A and 4B, the cutting jig 23
Is a substantially cylindrical member, and the second insertion hole 24 having a circular cross-section from the upper end to the lower end near the center in the radial direction.
Are formed. Further, an air hole 25 having a smaller diameter than the second insertion hole 24 is provided below the second insertion hole 24.
3 is formed to extend to the lower end surface.

The second insertion hole 24 is larger than the outer diameter of the rod-shaped main body 11 of the holding jig 10 and is
6, and the depth D2 of the second insertion hole 24 is set at the bending start position 14a on the distal end side of each holding claw 14 in the radially outward direction and at the base end side of each holding claw 14. The distance D2 between the corresponding rod-shaped main body 11 and the end thereof is equal to or longer than D2.

Hereinafter, the holding jig 10 and the set jig 1 will be described.
A procedure for performing electrostatic powder coating on the stator core 26 (annular object to be coated) using the cutting tool 7 and the punching jig 23 will be described. FIG.
As shown by an arrow in (a), first, an unpainted stator core 26 is arranged in the support hole 22 of the set jig 17, and then, as shown by a virtual line in FIG. The holding jig 10 is inserted into the first insertion hole 18 through the circumference. In this case, the holding jig 10 is inserted into the first insertion hole 18 from the end corresponding to the base end of the holding claw 14 in the rod-shaped main body 11.

As shown by a solid line in FIG.
When 1 is inserted to the vicinity of the lower end of the first insertion hole 18, the tip 14 b of each holding claw 14 is pressed and shrunk by the inner periphery of the stator core 26 and engages with the inner periphery. This allows
Stator core 26 is held by holding jig 10.

As shown in FIGS. 6A and 6B, the stator core 2
The holding jig 10 holding the jig 6 is pulled out from the first insertion hole 18 of the set jig 17, and the holding jig 10 is placed on a transport device (such as a chain conveyor) in the electrostatic powder coating device 30 described later. . Then, the holding jig 1 will be described in a procedure described later.
The electrostatic powder coating is applied to the stator core 26 on the upper side.

Subsequently, the holding jig 10 holding the coated stator core 26b is carried out of the electrostatic powder coating apparatus, and
7, the holding jig 10 is inserted into the second insertion hole 24 of the extracting jig 23. Also in this case, the holding jig 10 is inserted into the second insertion hole 24 from the end of the rod-shaped main body 11 on the side corresponding to the base end of the holding claw 14.

When the holding jig 10 is inserted to the vicinity of the lower end in the second insertion hole 24, as shown by a solid line in FIG.
4 is compressed radially by the second insertion hole 24 in the radial direction, and the distal end is located radially inward from the inner periphery of the stator core 26b. As a result, the stator core 26b is It falls on the upper surface of the punching jig 23. Then, after the holding jig 10 is extracted from the second insertion hole 24, the stator core 26 on the upper surface of the extraction jig 23 is removed.
b can be recovered.

As shown in FIG. 6B, the stator core 2
Reference numeral 6 denotes a plurality of, for example, twelve, teeth portions 26b for winding a coil (not shown) provided at predetermined intervals in the circumferential direction on the outer periphery of the annular main body portion 26a. As shown in FIG. 8A, the stator core 26 is formed by laminating and integrating a predetermined number of core plates 27 having the same shape with each other, and while holding the stator core 26 with the holding jig 10, an insulating coating film is formed on the surface thereof. 28 are formed.

As schematically shown in FIG. 9, an electrostatic powder coating apparatus 30 for forming the insulating coating film 28 includes a first
An electrostatic powder coating area 30a, a powder removal area 30b,
A second electrostatic powder coating area 30c;
Corresponding to the first electrostatic powder coating means 31, the powder removing means 32, and the second electrostatic powder coating means 3, respectively.
3 and a transfer unit (not shown) (not shown) for transferring the holding jig 10 holding the stator core 26 through the respective regions 30a to 30c.

First and second electrostatic powder coating means 31, 3
3 is, for example, the first and second electrostatic powder coating areas 30
a, a powder coating machine for spraying charged (for example, frictionally charged) coating particles toward 30c. For example, the one disclosed in the specification and drawings of Japanese Patent Application No. 8-292960 may be used. it can.

The powder removing means 32 includes a removing plate (not shown) made of, for example, spring steel. The removing plate is such that the rotation of the stator core 26 held by the holding jig 10 does not stop. Acts on its outer peripheral surface,
The powder paint adhered to the outer peripheral surface is removed. As the powder removing means 32, a removing brush or the like which is rotated in a predetermined direction may be used in addition to the above. Although not shown in FIG. 9, the electrostatic powder coating apparatus 30 also includes a heating region for performing high-frequency heating and the like described below, a heating unit corresponding thereto, and the like.

Hereinafter, the procedure for forming the insulating coating film 28 on the surface of the stator core 26 will be described with reference to the flowchart of FIG. First, in step S1, pre-processing of the stator core 26 is performed. This is a step of removing deposits such as press oil and rust-preventive oil on the surface of the stator core that inhibit the stability and adhesion of the coating film. The temperature at which the deposits are decomposed or evaporated and the core material is not oxidized. Then, the stator core 26 is subjected to heat treatment by hot air convection or in an infrared atmosphere furnace for a certain period of time.

The stator core 26 having completed the pre-processing step is
After cooling to room temperature, powder coating is performed in a first electrostatic powder coating step (S2). That is, the electrostatic powder coating is performed while the stator core 26 held by the holding jig 10 is moved through the first electrostatic coating region 30a while rotating integrally with the stator core 26. As a result, FIG.
As shown in (b), an insulating coating film 28 having a predetermined thickness, for example, about 30 to 50 μm is formed on substantially the entire surface of the stator core 26.

The stator core 26 having been subjected to the first electrostatic powder coating is transported while rotating through the powder removing area 30b, during which a powder removing step is performed (S).
3). Specifically, only the powder attached to the outer peripheral surface 26c of the teeth portion 26b of the stator core 26 is removed by the powder removing means 32. As a result, as shown in FIG. 8C, only the insulating coating film 28 adhered to the outer peripheral surface 26c of each tooth portion 26b is removed, and the insulating coating film 28 adhered to the surface of the other portion of the stator core 26 is removed. It is kept as it is.

Next, a second electrostatic powder coating step is performed (S4). Even in the second electrostatic powder coating, the stator core 2
An insulating coating film 28 having a predetermined thickness, for example, approximately 20 to 50 μm is formed on substantially the entire surface of the surface of the insulating film 6. If the electrostatic powder coating step is performed twice with the powder removing step interposed in this way,
As shown in FIG. 8D, the teeth 2 of the stator core 26
Film thickness T2 of the insulating coating film 28 on the outer peripheral surface 26c of FIG.
Is thinner than the film thickness T1 of the other region.

Accordingly, the region having the film thickness T1 has sufficient electrical insulation characteristics and rust prevention. Even when a coil (not shown) is wound around each tooth portion 26b at the time of assembling the motor, the coil and the coil have the same thickness. Sufficient electrical insulation between the stator core 26 is ensured. On the other hand, the film thickness T2 of the outer peripheral surface 26c of the teeth portion 8 of the stator core 26 is relatively thin, and the outer peripheral surface 26c does not have sufficient electrical insulation properties, but a predetermined rust prevention effect is achieved. Thus, the teeth portion 26b
By reducing the thickness of the outer peripheral surface 26c, the distance between the outer peripheral surface 26c and the magnet (not shown) on the rotor side when assembled to the motor can be reduced, thereby increasing the efficiency of the motor. It also contributes to downsizing of the motor.

After the second electrostatic powder coating step, the stator core 26 shifts to a high-frequency primary heating step (S5). In this high frequency primary heating step, the painted stator core 26
While being rotated (held by the holding jig 10), it is passed through a skid coil (not shown) of the high-frequency heater, and is allowed to go from room temperature to about 150 ° C. for a predetermined time, for example, about 20 to 4 ° C.
Heat for 0 seconds.

By this heating, the paint particles covering the surface of the stator core 26 are melted, and the next cooling step (S6)
By cooling the stator core 26 below the melting point temperature of the powder coating, the coating layer is fixed to the surface of the stator core 26. After this cooling, compressed air is injected into the holding jig 10 holding the stator core 26 and the periphery thereof,
Excessive powder paint adhered to these is removed by the injected compressed air.

Further, the stator core 26 moves to the high frequency secondary heating step (S7), and the painted stator core 26
While being rotated (held by the holding jig 10), it is passed between skid coils (not shown) of the high-frequency heater, and the heating time is approximately 20 to 40 seconds based on the temperature after the pretreatment step. Reheat to 200-230 ° C. The stator core 26 that has passed between the skid coils is subjected to a cooling step (S8).
And forced cooling to room temperature by compressed air injection or a blower, and at the same time, excess powder attached to the holding tool and the stator core 26 is removed.

The weight 16 of the holding jig 10 (FIG. 1) of the above embodiment promotes the rotation of the holding jig 10 on the electrostatic powder coating apparatus 30 and is held by the holding jig 10. This serves to uniformly apply the coating to each part of the stator core 26. For example, the holding jig 10 that holds a relatively small stator core 26 having an inner diameter of about 15 mm or less preferably includes the weight 16 because the weight of the rod-shaped main body 11 is relatively small.

On the other hand, for the holding jig 10 for holding a relatively large stator core 26 having an inner diameter exceeding 15 mm, for example, by increasing the outer diameter of the rod-shaped main body 11, the holding jig 10 The weight 16 need not always be provided because the weight of the weight 16 can be made relatively large.
In that case, the rod-shaped main body 11 of the holding jig 10 is
As shown in (1), it can be composed of a small diameter portion 11a near both ends in the axial direction and a large diameter portion 11b near the middle portion in the axial direction.

[0040]

As described above, according to the first aspect of the present invention,
The jig for holding the annular object to be coated is a holding jig for holding the annular object to be coated on an inner periphery thereof, the rod-shaped body having an outer diameter smaller than the inner diameter of the annular object to be coated, and the rod-shaped body. A plurality of flexible holding claws arranged along the outer circumference at substantially the same axial position, each base end of which is connected to the rod-shaped main body, and the tip of each holding claw is in a free state,
Since it is located radially outward from the inner peripheral position of the annular workpiece, the distal end of each holding claw is engaged with the inner periphery of the annular workpiece while compressing the distal end radially inward. This allows the holding jig to hold the annular workpiece. Thus, according to the present invention, as in the prior art, 1
Compared to the case where the ring-shaped workpiece is held between a pair of holding jigs, the ring-shaped workpiece can be held with a very simple operation using a single holding jig. Can be performed efficiently, and individual annular workpieces can be held by a single holding jig, so that the number of holding jigs required to hold a predetermined number of annular workpieces has conventionally been reduced. It is halved in comparison.

Further, in the present invention, since each annular workpiece is held by a single holding jig, the annular workpiece is held between a pair of conventional holding jigs. The looseness of the connection between the jigs does not cause the annular workpiece to be eccentric with respect to the holding jig and the holding becomes unstable. And the quality after painting can be improved.

According to a second aspect of the present invention, in the configuration of the first aspect, a rod-shaped jig is provided between the holding claw and an end of a rod-shaped main body corresponding to a tip end side of the holding claw. A weight portion having a diameter larger than that of the rod-shaped body is provided on the outer periphery of the main body, and the weight of the holding jig is increased by using such a weight portion, thereby holding the annular workpiece. When the jig is placed on the electrostatic powder coating device, the holding jig becomes easy to rotate on the electrostatic powder coating device, thereby
Each part of the annular object to be coated held by the holding jig can be uniformly coated.

According to a third aspect of the present invention, there is provided a jig for setting an annular workpiece.
3. A substantially vertical first insertion hole having an inner diameter larger than the outer diameter of the rod-shaped body and smaller than the outer diameter of the annular workpiece in the holding jig according to claim 1 or 2, and near the upper end of the first insertion hole. A support hole having an inner diameter substantially equal to the outer diameter of the annular object to be coated, which is provided substantially concentrically, wherein the depth of the first insertion hole is equal to the tip of each of the holding claws and the depth of the holding claw. The distance between the base end portion and the end of the rod-shaped main body is set to be equal to or larger than the distance. The use of the set jig allows the holding claws of the holding jig to easily hold the annular workpiece. be able to.

That is, first, after the annular object to be coated is inserted into the support hole of the set jig, the rod-shaped body of the holding jig is moved from the end corresponding to the base end side of the holding claw from the end. When inserted into the first insertion hole through the inner periphery of the annular workpiece, the vicinity of the tip of the holding claw is pressed radially inward by the inner periphery of the annular workpiece, and the tip of the holding claw is annular. Engage with the inner circumference of the object to be coated. In this state, the holding jig can be pulled out from the first insertion hole of the set jig, placed on the electrostatic powder coating apparatus, and the coating can be started. The first
The depth of the insertion hole is equal to or greater than the distance between the distal end of each holding claw and the end of the rod-shaped body corresponding to the base end of the holding claw. It is possible to engage the distal end of each holding claw with the inner periphery of the annular workpiece in the support hole before inserting it into the support hole.

According to a fourth aspect of the present invention, there is provided a jig for removing an object to be coated having a substantially vertical direction having an inner diameter larger than the outer diameter of the rod-shaped main body and smaller than the inner diameter of the annular object to be coated. Wherein the depth of the second insertion hole is greater than or equal to the distance between each of the holding claws and the end of the rod-shaped body corresponding to the base end side of the holding claw. By using such a removal jig, the painted annular workpiece can be easily removed from the holding jig.

That is, when the rod-shaped main body of the holding jig holding the painted annular object to be coated is inserted into the second insertion hole from the end corresponding to the base end side of the holding claw, the holding claw is opened. The tip of the holding claw is disengaged from the inner periphery of the ring-shaped workpiece by being pressed and shrunk inward in the radial direction by the second insertion hole, thereby dropping the ring-shaped workpiece onto the punching jig. I do. Then, after the holding jig is pulled out from the second insertion hole of the drawing jig, the coated annular workpiece can be collected from the drawing jig.

According to a fifth aspect of the present invention, there is provided the electrostatic powder coating method for an annular workpiece, after the annular workpiece is disposed in the support hole of the set jig according to the third aspect, the holding jig according to the first or second aspect. Is inserted from the end corresponding to the base end side of the holding claw into the first insertion hole through the inner periphery of the annular object to be coated, and each of the holding claws is inserted at the inner periphery of the annular object to be coated. By pressing and shrinking in the radial direction, the tip of each holding claw is engaged with the inner periphery of the annular workpiece to hold the annular workpiece by the holding jig,
Subsequently, the holding jig is detached from the first insertion hole of the set jig, and the annular workpiece is placed on the electrostatic powder coating apparatus together with the holding jig. After the body coating is performed, the rod-shaped main body of the holding jig holding the painted ring-shaped object to be coated is moved from the end corresponding to the base end side of the holding claw to a position corresponding to the end of the jig according to claim 4. (2) inserting each of the holding claws into the insertion hole and pressing each holding claw radially inward with the second insertion hole to separate the tip end of each holding claw from the inner periphery of the painted annular workpiece to be coated. By performing the coating on the ring-shaped workpieces in accordance with the above procedure, the individual ring-shaped workpieces can be held by a single holding jig during the coating, so that the holding required for holding a predetermined number of the ring-shaped workpieces is performed. The number of jigs is reduced by half compared to the conventional one, and the ring Sobutsu to thereby retain stably improve the quality after painting.

Further, the setting and removal of the annular workpiece to and from the holding jig can be easily performed by using the above-described set jig and extraction jig, respectively, so that the electrostatic powder coating process is efficiently performed. In addition to this, the necessary minimum number of the set jig and the extraction jig may be prepared, so that the number of jigs can be reduced as a whole.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a holding jig according to an embodiment of the present invention, wherein FIG. 1A is a front view, and FIG. 1B is an enlarged cross-sectional view taken along line II of FIG.

FIGS. 2A and 2B are diagrams showing holding claws in the holding jig, wherein FIG. 2A is a plan view and FIG. 2B is a front view.

3A and 3B are diagrams showing a set jig according to the embodiment of the present invention, wherein FIG. 3A is a vertical sectional view and FIG. 3B is a plan view.

FIGS. 4A and 4B are views showing a punching jig according to the embodiment of the present invention, wherein FIG. 4A is a vertical sectional view, and FIG.

FIG. 5 is a vertical cross-sectional view showing how a stator core is set on the holding jig using the setting jig.

6A and 6B are views showing a holding jig on which the stator core is set, wherein FIG. 6A is a front view, and FIG. 6B is a sectional view taken along line VII-VII of FIG.

FIG. 7 is a vertical cross-sectional view showing a state in which a stator core is removed from the holding jig using the extracting jig.

FIG. 8 is a sectional view showing a procedure for applying electrostatic powder coating to the stator core.

FIG. 9 is an explanatory view showing an electrostatic powder coating apparatus for applying electrostatic powder coating to the stator core.

FIG. 10 is a flowchart showing a procedure for applying electrostatic powder coating to the stator core.

FIG. 11 is a front view showing a modification of the holding jig.

FIG. 12 is a partial sectional front view showing a conventional holding jig.

FIG. 13 is a cross-sectional view showing a state where a stator core is held by using the conventional holding jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Holding jig 11 Rod-shaped main body 14 Holding claw 16 Weight (weight part) 17 Set jig 18 1st insertion hole 22 Supporting hole 23 Extraction jig 24 Second insertion hole 26 Stator core (annular coated object)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // H02K 15/12 H02K 15/12 GF term (reference) 4D075 AA09 AA56 AA60 AA62 AA65 AA67 CA23 CA48 DA15 DA20 DA23 DB02 DC19 EA02 4F034 AA01 BA01 BA17 CA14 CA22 DA14 4F035 AA03 AA04 CA02 CA05 CB02 CB12 CB13 4F042 AA03 AA06 DF02 DF07 DF11 DF18 DF29 DF32 DF34 5H615 AA01 BB01 PP01 PP06 SS37

Claims (5)

[Claims] 1. A holding jig for holding an annular object to be coated on an inner periphery thereof, comprising: a rod-shaped body having an outer diameter smaller than an inner diameter of the annular object to be coated; And a plurality of flexible holding claws, each of which has a base end connected to the rod-shaped main body and is disposed along the outer periphery of the ring-shaped object to be coated. A jig for holding an annular object to be coated, which is located radially outward from a circumferential position. 2. A weight portion having a diameter larger than that of the rod-shaped body is provided on an outer periphery of the rod-shaped body between the holding claw and an end of the rod-shaped body corresponding to a tip end side of the holding claw. 2. The jig for holding an annular object to be coated according to claim 1, wherein 3. A substantially vertical first insertion hole having an inner diameter larger than the outer diameter of the rod-shaped main body and smaller than the outer diameter of the annular object to be coated in the holding jig according to claim 1 or 2, and
A support hole having an inner diameter substantially equal to the outer diameter of the annular object to be coated provided substantially concentrically near the upper end of the insertion hole, and the depth of the first insertion hole is set at the tip of each of the holding claws. A jig for setting an annular object to be coated, wherein the distance is equal to or greater than a distance between the portion and an end of a rod-shaped body corresponding to a base end of the holding claw. 4. The holding jig according to claim 1, further comprising a substantially vertical second insertion hole having an inner diameter larger than the outer diameter of the rod-shaped body and smaller than the inner diameter of the annular workpiece. An annular jig for removing a workpiece to be coated, wherein a depth of an insertion hole is equal to or greater than a distance between each of the holding claws and an end of a rod-shaped body corresponding to a base end side of the holding claws. 5. The rod-shaped body of the holding jig according to claim 1 or 2 corresponding to the base end side of the holding claw after the annular object to be coated is disposed in the support hole of the set jig of claim 3. From the end to be inserted into the first insertion hole through the inner periphery of the annular object to be coated, and radially compress each of the holding claws at the inner periphery of the annular object to make the tip of each holding claw annular. The annular workpiece is held by the holding jig by engaging with the inner periphery of the workpiece, and then the holding jig is detached from the first insertion hole of the set jig to form an annular shape together with the holding jig. After the object to be coated is placed on the electrostatic powder coating apparatus, after applying the electrostatic powder coating to the annular object to be coated, the rod-shaped holding jig holding the coated annular object to be coated is applied. 5. Inserting the main body from the end corresponding to the base end side of the holding claw into the second insertion hole of the extracting jig according to claim 4. The tip of each of the holding claws is detached from the inner periphery of the painted annular to-be-coated object by compressing each holding claw radially inward with the second insertion hole. Electrostatic powder coating method for objects.