JP5436151B2 - Dip coating apparatus and dip coating method - Google Patents

Description

  The present invention relates to a dip coating apparatus (dip coating apparatus) and a dip coating method (dip coating method). In particular, the present invention relates to a dip coating apparatus and a dip coating method capable of uniformly and easily applying a coating treatment liquid even to an object to be processed that is heavy and has a complicated shape.

Conventionally, as a method of forming a coating film on the surface of an object to be processed, the object to be processed is immersed in a coating treatment liquid, and then lifted, and further, the coating treatment liquid applied to the object to be processed is dried, cured, etc. A so-called dip coating method is widely used.
For example, electronic components such as various capacitors, varistors, or hybrid ICs are formed with insulating coatings for the purpose of protection from moisture and mechanical protection. Is widely adopted.
In addition, for the purpose of improving durability, a liquid lubricant layer is formed with a fluorine-based liquid lubricant or the like on a magnetic recording medium used for a hard disk device or the like. Dip coating is widely adopted.

However, such dip coating can stably form a uniform coating film or the like if it is applied to an object having a relatively small surface area such as an electronic component or a magnetic recording medium. There was a problem that the effect could not be sufficiently exerted on a large object to be processed.
For example, a resin film made of an epoxy resin or the like is formed on a disk brake used in a vehicle or the like for the purpose of rust prevention. However, such a disk brake has a relatively large surface area and is sandwiched between pads. It has a disk-shaped disk part and a cylindrical hat part located inside thereof.
For this reason, when the rust prevention treatment for the disc brake is performed by the dip coating method, the coating treatment liquid moves downward due to gravity, or the coating treatment solution excessively remains in the hat portion, so that a uniform resin film is formed. There was a problem that it was difficult to form.
Also, disk brakes are often provided with grooves and openings on the surface for the purpose of promoting cooling of frictional heat generated during braking, but the presence of such grooves and openings is also uniform. This makes it difficult to form a proper resin film.

Thus, as a surface treatment method for a disc brake or the like in a vehicle brake device, a surface treatment method for forming a phosphate film using an electrolytic treatment method has been proposed (for example, Patent Document 1).
More specifically, phosphate ions, zinc ions, and nitrate ions are contained in at least a region to be a sliding surface with a counterpart friction member of a disc-like or drum-like rotary brake member made of an iron-based material. A surface treatment method for a rotary brake member that forms a phosphate film having a film thickness of 1 to 10 μm, a mass of 4 to 35 g / m ² , and a crystal grain of 50 μm or less using an electrolytic treatment method in a phosphate film forming solution. It is disclosed.

In addition, a surface treatment method such as a disc brake in a vehicle component using a powder coating has been proposed (for example, Patent Document 2).
More specifically, in a fluid immersion apparatus, a step of floating a charged partially cured powder coating while applying a high voltage electric field, a step of attaching a powder coating to the surface of a vehicle part, a powder There is disclosed a method for treating a surface of a vehicle component, comprising: a step of baking and curing a vehicle component to which a body paint is attached to form a coating film on the surface.

JP 2002-250377 A (Claims) JP 2002-35692 A (Claims)

However, although the phosphate coating by the surface treatment method disclosed in Patent Document 1 is relatively excellent in chemical resistance, it is inferior in physical resistance and easily applied when a mechanical impact is applied to the workpiece. There was a problem of peeling. In addition, it is not only difficult and difficult to control surface treatment conditions such as electrode placement for carrying out the electrolytic treatment method, applied voltage, treatment time, treatment liquid concentration management, etc. The problem of being disadvantageous was also seen.
In addition, according to the surface treatment method disclosed in Patent Document 2, it is difficult to form a coating film having a uniform thickness because the characteristics of the partially cured powder coating material vary. In the case of an object having a complicated shape provided with an opening, there has been a problem in that the coating thickness tends to vary greatly at that location. In addition, special equipment such as a fluid dipping device is required, and it is difficult and difficult to control surface treatment conditions such as air pressure to float the powder paint and applied voltage at the coating electrode. Has a problem of high production cost and economical disadvantage.
Furthermore, when the object is a heavy object and a complicated object to be processed, such as a disc brake, the complicated surface treatment method disclosed in Patent Documents 1 and 2 uses the surface treatment. Control of conditions became more complicated and difficult, and there was a problem that stable surface treatment was not possible.

Therefore, as a result of intensive studies, the inventor of the present invention has found that a dip coating apparatus provided with a predetermined immersion tank, rotating means, and air spraying means has a synergistic effect of these components, for example, against a disc brake. Thus, the present invention has been completed by finding that a coating solution can be uniformly and easily applied and a predetermined coating film can be formed.
That is, the present invention has a virtual center axis that can be a rotation axis even if the object is a heavy object and has a complicated shape, such as a disc brake, and the virtual center axis A dip coating apparatus capable of forming a predetermined coating film and a dip coating apparatus capable of forming a predetermined coating film as well as being able to apply a coating treatment liquid uniformly and easily as long as it is a workpiece to be rotated around the center. An object of the present invention is to provide a dip coating method.

According to the present invention, the immersion tank for immersing the object to be processed in the coating treatment liquid, and the object to be processed are rotated about the virtual central axis of the object to be processed and attached to the object to be processed. Rotating means for scattering and removing the excess coating treatment liquid by centrifugal force, and air is blown against the object to be processed being rotated by the rotating means, and the excess adhering to the object to be processed Air blowing means for further removing the coating treatment liquid, and the rotating means has a horizontal rotating shaft, and the shaft member in a state where the workpiece is fixed is attached to and detached from the rotating shaft. A rotation drive unit for freely clamping and a bearing unit, and the immersion tank is disposed below the shaft member in a state where the object to be processed is fixed, and is movable in the vertical direction; and The coating solution is stored in the lower part of the immersion tank. And includes a reservoir capable of containing immersion tank when moving downward, further to the bottom of the dip tank, and closing controllable valve member, dip coating apparatus characterized by providing a communication hole, the Can be provided to solve the above-mentioned problems.
In other words, since the dip coating apparatus of the present invention is provided with a predetermined rotating means, even a heavy object to be processed can be stably rotated at a predetermined speed around the virtual central axis. Can do.
Thereby, an excess coating processing liquid can be effectively removed by scattering with a centrifugal force among the coating processing liquid apply | coated by the dip coating method in the immersion tank.
In addition, since the dip coating apparatus of the present invention is provided with a predetermined air blowing means, it is also effective for an extra coating treatment liquid that remains in the concave portion of the object to be processed and cannot be removed only by centrifugal force. Can be removed.
Therefore, with the dip coating apparatus of the present invention, for example, a heavy object, such as a disc brake, and a complicated object to be processed are uniformly and centered on the virtual central axis. The coating treatment liquid can be easily applied.
Moreover, by comprising in this way, a to-be-processed object can be easily clamped and rotated with a predetermined | prescribed rotation drive part and a bearing part.
Moreover, by comprising in this way, attachment / detachment replacement | exchange of the to-be-processed object after application | coating becomes easy, and it can raise manufacturing efficiency further.
Furthermore, by comprising in this way, a to-be-processed object can be dip-coated in the state pinched | interposed by the rotation drive part and the bearing part, and also after raising a to-be-processed object from a coating processing liquid By rotating as it is, excess coating solution can be scattered.

Further, in configuring the dip coating apparatus of the present invention, the rotation drive unit is detachable in the rotation axis direction and fixed in the rotation direction with respect to the drive end provided at the end of the shaft member. And has a driving projection for fitting with the shaft, and the bearing is detachable in the rotational axis direction with respect to the bearing end provided at the other end of the shaft member, and in the rotational direction. It is preferable to have a bearing projection for fitting in a rotatable state.
By comprising in this way, the to-be-processed object fixed to the shaft member can be more easily pinched and rotated by the rotation drive part and the bearing part.
Moreover, by comprising in this way, attachment / detachment replacement | exchange of the to-be-processed object after application | coating becomes easy, and it can raise manufacturing efficiency further.

Further, in configuring the dip coating apparatus of the present invention, the shaft member includes the shaft core member and a plurality of fixing members for fixing the object to be processed to the shaft core member. However, it is preferable that the cylindrical member penetrated by the shaft core member has a holding portion for holding the object to be processed arranged between the fixed members in the axial direction of the shaft member.
By comprising in this way, a to-be-processed object can be fixed to a shaft member stably and reliably rapidly, and can be removed freely.

In configuring the dip coating apparatus of the present invention, the air spraying means is preferably a plurality of air spraying nozzles capable of reciprocating motion.
By comprising in this way, it becomes possible to remove more effectively the excess coating process liquid which remains in the recessed part of a to-be-processed object and cannot be removed only by centrifugal force.

Further, in configuring the dip coating apparatus of the present invention, the object to be processed is a disc shape or a substantially disc shape, and two disc brakes having an opening at the center thereof. It is preferable that the disc brake is fixed to the shaft member so as to face each other symmetrically.
By comprising in this way, not only the to-be-processed object can be rotated more stably but the production efficiency of surface treatment can also be improved.

Another aspect of the present invention is a dip coating method for applying a coating treatment liquid to the surface of an object to be processed, which includes the following steps (a) to (c): It is.
(A) An object to be processed is disposed below the shaft member in a state in which the object to be processed is fixed, and is an immersion tank that is movable in the vertical direction, and the coating treatment liquid is stored in the lower part of the immersion tank. And a storage tank capable of accommodating the immersion tank when moved downward, and further, accommodated in an immersion tank provided with a valve member capable of opening and closing and a communication hole at the bottom of the immersion tank. (B) The object to be processed has a horizontal rotating shaft, and the shaft member in a state where the object to be processed is fixed is detachably held on the rotating shaft. a rotary drive for, is rotated by the rotation means comprising a bearing portion, and the object to be processed excess coating treatment liquid adhering to, the step (c) rotating means for removing by scattered by the centrifugal force Air to be processed is rotated by air blowing means. In other words, the dip coating method of the present invention includes a predetermined step, which is a heavy object and complicated. It is possible to apply the coating process evenly and easily to a workpiece having a simple shape.

Moreover, when implementing the dip coating method of this invention, it is preferable to make the rotational speed of a rotation means into the value within the range of 300-1000 rpm.
By carrying out in this way, the coating treatment liquid applied in the step (a) can be scattered without excess or deficiency.

In carrying out the dip coating method of the present invention, it is preferable to use a plurality of air spraying nozzles capable of reciprocating as the air spraying means, and to spray air locally on the recesses in the workpiece.
By carrying out in this way, the coating treatment liquid can be more uniformly applied to the workpiece.

FIG. 1A to FIG. 1C are views for explaining the dip coating apparatus of the present invention. FIGS. 2A to 2B are views provided to explain the object to be processed. FIGS. 3A to 3B are views for explaining the workpiece to be processed in a state of being fixed to the shaft member. FIG. 4A to FIG. 4E are other views provided for explaining various types of objects to be processed. FIGS. 5A to 5C are diagrams for explaining the rotating means. FIGS. 6A to 6C are diagrams provided to explain the fitting between the rotating member and the shaft member. Drawing 7 (a)-(d) is another figure used in order to explain fitting with a rotation member and a shaft member. FIGS. 8A to 8C are views provided to explain the shaft member. FIGS. 9A to 9B are diagrams provided to explain the relationship between the liquid level and the shaft member. FIGS. 10A to 10C are diagrams provided for explaining the immersion bath. Fig.11 (a)-(c) is another figure provided in order to demonstrate an immersion tank. FIGS. 12A to 12C are diagrams provided for explaining the air blowing means. Drawing 13 is a figure offered in order to explain a scattering prevention member. FIGS. 14A to 14B are diagrams provided for explaining the curing device and the cooling device. 15 (a) to 15 (b) are diagrams provided for explaining the places where the thickness of the cured coating film was measured in the examples.

[First Embodiment]
In the first embodiment, as shown in FIGS. 1A to 1C, an immersion tank 10 for immersing the object to be processed 50 (50 a, 50 b) in the coating treatment liquid, and the object 50 to be processed. Rotating means 20 (20a, 20b) for rotating and rotating around the virtual central axis of the object to be processed 50 and removing excess coating treatment liquid adhering to the object to be processed 50 by centrifugal force. And air blowing means 30 for further removing excess coating treatment liquid adhering to the object to be treated 50 by blowing air to the object 50 being rotated by the rotating means 20; The rotating means 20 (20a, 20b) has a horizontal rotating shaft 21, and the shaft member 40 in a state in which the workpiece 50 (50a, 50b) is fixed on the rotating shaft 21. Time to detachably hold The immersion tank 10 includes a drive unit 20a and a bearing unit 20b, and is disposed below the shaft member 40 in a state in which the workpiece 50 (50a, 50b) is fixed, and is movable in the vertical direction. As shown in FIGS. 11 (a) to 11 (c), a storage tank 12 in which the coating treatment liquid is stored in the lower part of the immersion tank 10 and can accommodate the immersion tank 10 when moved downward. Further, the dip coating apparatus 1 is characterized in that a valve member 14 that can be controlled to open and close and a communication hole 13 are provided at the bottom of the immersion tank 10 .
1A shows a side view of the dip coating apparatus, FIG. 1B shows a top view, and FIG. 1C shows a front view.
Hereinafter, the dip coating apparatus as the first embodiment will be specifically described with reference to the drawings as appropriate.

1. Object to be processed As long as the object 50 to be processed in the dip coating apparatus of the first embodiment has a virtual center axis 55 and has a shape that can rotate around the virtual center axis 55, Although not particularly limited, for example, as shown in FIGS. 2 (a) to 2 (b), a workpiece having a disk shape or a substantially disk shape and having an opening 51 at the center thereof. 50 is preferable.
This is because the workpiece having such a shape can be stably rotated by the rotating means.
That is, if it is a to-be-processed object of such a shape, as shown to Fig.3 (a)-(b), by fixing in the state which penetrated the shaft member 40 mentioned later to the opening part 51, it is easy. This is because it can be attached to the rotating means and rotated.
More specifically, for example, if the workpiece is a disc brake, in addition to the central opening, an opening for promoting cooling, an opening provided for fixing to other members, and the like Is provided around the center.
However, when fixing an object to be processed to the shaft member, when using an opening other than the central part, the symmetry of the object to be processed on the shaft member is compared with using an opening at the central part. In some cases, it may be difficult to ensure the stability, or the fixing of the workpiece to the shaft member may be excessively complicated.
On the other hand, when the shaft member is fixed in a state where the shaft member is passed through the central opening, the symmetry of the object to be processed on the shaft member can be stably secured, and the fixing is performed. Can also be made easier.

In addition, the diameter of the object to be processed (in the case of a non-circular shape, the equivalent circle diameter) is not particularly limited, but the size of the dip coating apparatus used and the material of the object to be processed are not limited. Although it depends on the substance and the form of the object to be treated, it is usually preferable to set the value in the range of 50 to 1000 mm, more preferable to set the value in the range of 100 to 500 mm, and 150 to 300 mm. It is more preferable to set the value within the range.
Further, the thickness of the object to be processed is not particularly limited, but it is usually preferably a value in the range of 1 to 200 mm, more preferably a value in the range of 5 to 100 mm. More preferably, the value is within the range of 10 to 50 mm.
Furthermore, when the workpiece has an opening, the diameter is preferably a value in the range of 10 to 300 mm, more preferably a value in the range of 50 to 200 mm, and 80 to 100 mm. It is more preferable to set the value within the range.
In addition, the to-be-processed object in 1st Embodiment may be a form as shown to Fig.4 (a)-(e).
That is, as shown in FIGS. 4A to 4E, the form of the object to be processed is a virtual center axis 55 (55c to 55g) such as a cylindrical shape 50c, a conical shape 50d, a spherical shape 50e, a polyhedron 50f, and an indefinite shape 50g. ) And a shape that can rotate around the virtual central axis 55, and the shape of the others is not particularly limited.

Moreover, it is preferable to make the weight of a to-be-processed object into the value within the range of 0.5-5 kg.
The reason for this is that when the weight of the object to be processed is less than 0.5 kg, depending on the material of the object to be processed, problems such as deformation and damage are likely to occur when fixing to the shaft member described later. This is because there may be cases.
On the other hand, when the weight of the object to be processed exceeds 5 kg, it may be difficult to stably rotate the rotating means.
Therefore, the weight of the object to be processed is more preferably set to a value within the range of 1 to 3 kg, and further preferably set to a value within the range of 1.2 to 2 kg.

In addition, as a specific example of an object to be processed in the first embodiment, that is, an object to be processed that has a virtual center axis and is rotatable around the virtual center axis, for example, a disc brake used in a vehicle or the like, Examples include wheels, gears, dumbbells, or art works used in vehicles.
In particular, the disc brake 50 shown in FIGS. 2 (a) to 2 (b) is a member that originally needs to be subjected to a rust prevention treatment, and the shape thereof is substantially disc-shaped, and at the center thereof. From the point which has the opening part 51 which can set the virtual center axis | shaft 55, and the point whose weight is a value within the range of 0.5-5 kg generally, the to-be-processed in the dip coating apparatus of 1st Embodiment It is particularly suitable as a product.

2. Rotating Means The dip coating apparatus according to the first embodiment is characterized by comprising rotating means 20 (20a, 20b) as shown in FIGS.
The reason for this is that by providing such a rotating means, even an object having a considerable weight can be stably rotated at a predetermined speed.
As a result, it is because an excess coating processing liquid can be effectively removed by scattering with a centrifugal force among the coating processing liquids applied in the immersion tank described later.
In addition, because the object to be processed being rotated by the rotating means can be further removed by applying air to the object to be processed, which will be described later, by applying air to the object to be processed. is there.

As shown in FIG. 1A, the rotating means includes a horizontal rotating shaft 21 and a shaft member 40 in a state in which the workpiece 50 (50 a, 50 b) is fixed. The rotary drive part 20a for detachably clamping on the top and the bearing part 20b are provided, It is characterized by the above-mentioned .
The reason for this is that by configuring the rotating means in this way, the object to be processed can be easily held and rotated by the rotation driving unit and the bearing unit.
That is, as shown in FIG. 5 (a), first, the workpiece 50 (50a, 50b) fixed to the shaft member 40 having a configuration described later is moved to a shaft using a moving tool such as a traverse. The member 40 is moved while being sandwiched, and is placed between the rotation drive unit 20a and the bearing unit 20b so that the shaft core of the shaft member 40 and the rotation shaft 21 of the rotation means 20 (20a, 20b) overlap. .
Next, as shown in FIG. 5B, the shaft member 40 is moved by moving the rotation drive unit 20a and / or the bearing unit 20b toward the workpiece 50 (50a, 50b) horizontally. And the rotation drive unit 20a and the bearing unit 20b are fitted to each other, and the workpiece 50 (50a, 50b) can be easily attached to the rotating means 20 (20a, 20b) and rotated. Because.
Furthermore, by configuring the rotating member so as to be detachable in this way, it becomes easy to replace the object to be processed after coating, which can contribute to further increase in manufacturing efficiency.
In addition, since the mounting member 45 which mounts the shaft member 40 can rotate in the state in which the shaft member 40 and the to-be-processed object 50 fixed to it are mounted, it is shown in FIG.5 (c). As shown, it is preferable that the shaft member 40 is composed of a plurality of rollers 45a capable of passive rotation.
Moreover, an electric motor, an air motor, an engine, etc. can be used as a means to rotate a rotation drive part.

At this time, as shown in FIGS. 6A to 6C, the rotation drive unit 20 a is in the direction of the rotation axis with respect to the drive end 40 a having a predetermined shape provided at the end of the shaft member 40. 21 has a drive projection 23a for fitting in a fixed state in the rotational direction (not shown), and the bearing 20b is provided at the other end of the shaft member 40. It is preferable to have a bearing projection 23b that is detachably attached to the provided bearing end 40b in the rotational axis direction 21 and is fitted in a rotatable state in the rotational direction.
The reason for this is that with this configuration, the object to be processed fixed to the shaft member can be detachably held by the rotation drive unit and the bearing unit and can be stably rotated.
That is, as shown in FIGS. 6A to 6C, the rotation drive unit 20a is detachable in the rotation axis direction 21 with respect to the drive end 40a of the shaft member 40 and is fixed in the rotation direction. By having the drive protrusion 23a for fitting in a state, the drive force from the rotary drive unit 20a can be effectively reduced while the rotary drive unit 20a and the shaft member 40 are easily fitted. This is because the workpiece 50 (50a, 50b) can be rotated by being transmitted to the member 40.
Further, as shown in FIGS. 6A to 6C, the bearing portion 20b is detachable from the bearing end portion 40b of the shaft member 40 in the rotational axis direction 21 and is rotatable in the rotational direction. By having the bearing projection 23b for fitting with the shaft member 40, the shaft receiving member 20b and the shaft member 40 can be easily fitted, and the shaft member 40 rotated by the rotation driving unit 20a can be stably This is because it can be bearing.

Next, the drive protrusion 23a and the drive end 40a will be described in detail.
That is, as shown in FIG. 7A, the drive projection 23 a includes a plate-like portion 24 having a pointed inclined portion 24 ′ and a rod-like portion 25 formed continuously with the plate-like portion 24. It is preferable to have.
Further, as shown in FIG. 7B, the driving end portion 40a includes a bifurcated portion 45 provided with a pointed inclined portion 45 'at both ends thereof, and a shaft provided in the axial direction from the bottom of the bifurcated portion 45. It is preferable to have an axial end portion 42 a provided with a core hollow portion 46.
This is because the drive protrusion 23a and the drive end 40a are configured in this manner, so that the rotation drive unit 20a can be attached to and detached from the drive end 40a of the shaft member 40 in the rotation axis direction. This is because it is easy to fit in a fixed state in the rotation direction.
That is, in the case of the driving projection 23a and the axial end portion 42a shown in FIGS. 7A to 7B, as shown in FIGS. 7C to 7D, the plate-like portion included in the driving projection 23a. When the pointed inclined portion 24 ′ in 24 and the pointed inclined portion 45 ′ in the bifurcated portion 45 of the axial end portion 42 a contact and slide, they are rotated in the opposite directions.
As a result, the plate-like portion 24 of the drive projection 23a is fitted into the bifurcated portion 45 of the shaft end portion 42a, and the rod-like portion 25 of the drive projection 23a is the shaft core cavity portion of the shaft end portion 42a. 46.
Therefore, in the case of the drive projection 23a and the shaft end 42a shown in FIGS. 7A to 7B, the drive projection 23a can be attached to and detached from the shaft end 42a in the rotation axis direction. It becomes easy to fit in a fixed state in the rotation direction.

In addition, the drive protrusion is required to have a predetermined durability because the drive protrusion is more frequently used for fitting as compared with the shaft end that is sequentially replaced together with the workpiece.
Therefore, it is preferable to use high strength steel such as S45C as the material substance of the drive protrusion. On the other hand, steel having a lower strength, such as SS400, may be used for the shaft end.

Further, the bearing protrusion 23b shown in FIG. 6B is preferably rotatable by a built-in bearing, and it is preferable to use steel such as SS400 as the material.
Further, the bearing end portion 40b fitted to the bearing protrusion 23b preferably has a bearing bolt 44 having a fitting portion 44 'at the head, and the material material is preferably steel such as SS400. .
Such a bearing bolt also serves to fix a fixing member 43b, which will be described later, to the shaft core member 42.

Further, as shown in FIGS. 8A to 8C, the shaft member 40 described above is used to fix the shaft core member 42 and the workpiece 50 (50a, 50b) to the shaft core member 42. A plurality of fixing members 43 (43a, 43b, 43c), and each of the fixing members 43 (43a, 43b, 43c) is a cylindrical member that is penetrated by the shaft core member 42. In the axial direction, a clamping portion 43 ′ (43 ′ a, 43 ′ b) for clamping the workpiece 50 (50 a, 50 b) disposed between the respective fixing members 43 (43 a, 43 b, 43 c) 43′c).
This is because the workpiece can be stably fixed to the shaft member and can be removed by configuring the shaft member in this way.

More specifically, first, the fixing member 43a is fixed to the shaft core member 42 by drilling welding or the like.
Next, the opening of the object to be processed 50a is passed through the shaft core member 42, and the inner wall of the opening of the object to be processed 50a and the sandwiching part 43'a of the fixing member 43a are fitted.
In addition, as shown to Fig.8 (a), it is a plate-shaped object provided with multiple, for example, 2-6 pieces, radially, in a fixing member, as shown in FIG. By configuring as a plate-like object having the inclined portion, the virtual central axis of the workpiece is automatically positioned by the inclined portion so as to coincide with the axis of the shaft member.
Next, the fixing member 43c is passed through the shaft core member 42, and the holding portion 43'c of the fixing member 43c is fitted to the inner wall of the opening of the workpiece 50a.
And the opening part of the to-be-processed object 50b is passed through the axial core member 42, and the inner wall in the opening part of the to-be-processed object 50b and the clamping part 43'c of the fixing member 43c are fitted.
Subsequently, when the fixing member 43b is passed through the shaft core member 42 and the inner wall of the opening of the object to be processed 50b is fitted to the holding part 43'b of the fixing member 43b, the virtual center of the object to be processed 50b is obtained. The shaft is automatically positioned so as to coincide with the axis of the shaft member 40.
Finally, the fixing member 43 b is fixed by the bearing bolt 44 at the end of the shaft core member 42.
Thereby, a to-be-processed object can be stably fixed with respect to an axial core member by clamping by fixing members.
In addition, it is preferable to use steel, such as SS400, as a material of a shaft core member and a fixing member.
Further, the diameter of the shaft core member is preferably a value within the range of 5 to 100 mm, and the length is preferably within the range of 200 to 1000 mm.

8A to 8C, a total of three fixing members 43 (43a, 43b, 43c) are provided to fix the two workpieces 50 (50a, 50b) to the shaft member 40. However, the number of fixing members can be appropriately changed according to the number of objects to be processed.
Therefore, the number of fixing members may be two, or three or more.

Further, as shown in FIG. 8C, the object to be processed 50 is a disc-like or substantially disc-like shape, and is two disc brakes having an opening 51 at the center thereof. The two disc brakes are preferably fixed with respect to the shaft member 40 so as to face each other symmetrically.
This is because the object to be treated can be rotated more stably and the surface treatment efficiency can be improved by doing so.
That is, if the workpiece is a disc brake, it can be easily fixed symmetrically with respect to the shaft member due to its shape.
Further, by fixing the two disc brakes to the shaft member in a face-to-face relationship, the weight distribution in the entire two disc brakes fixed to the shaft member can be equalized and rotated more stably. This is because it can.
Furthermore, since two disc brakes can be dip coated at a time, the surface treatment efficiency can be improved.

3. Immersion tank Moreover, the dip coating apparatus of 1st Embodiment is provided with the immersion tank 10, as shown to Fig.1 (a)-(c).
The reason for this is that by providing the immersion tank, the coating treatment liquid is accommodated in the immersion tank, and the treatment target liquid is easily applied to the treatment object by immersing the treatment object in the coating treatment liquid. This is because it can be applied.

Such a dipping tank is not particularly limited as long as it has a volume and strength that can accommodate the coating treatment liquid and can immerse the workpiece in the coating treatment liquid.
Further, when the object to be processed is immersed while being rotated, it is not necessary to immerse the entire object to be processed in the coating treatment liquid, so that the depth of the immersion tank can be reduced.
Furthermore, as shown to Fig.9 (a)-(b), when making it immerse while rotating the to-be-processed object 50 (50a, 50b), without immersing the shaft member 40 with respect to a coating processing liquid, The entire object to be processed 50 (50a, 50b) can be immersed in the liquid to be processed (liquid level L1). In addition, FIG.9 (b) is the figure seen from E1 direction in Fig.9 (a).
That is, since the workpiece 50 (50a, 50b) and the shaft member 40 are fixed via the clamping portions 43 ′ (43′a, 43′b, 43′c), the shaft of the shaft member 40 There is a gap between the core and the workpiece 50 (50a, 50b). Therefore, the whole processing object 50 (50a, 50b) can be immersed in the processing liquid without immersing the shaft core of the shaft member 40 in the coating processing liquid.
Further, for example, when the object to be processed is a disc brake, the processing location is limited to the disc portion 52 (52a, 52b) (liquid level L2) or the disc portion 52 (52a, 52b). Of course, even when it is limited to only a part (liquid level L3), the object to be processed 50 (50a, 50b) can be processed without immersing the shaft member 40 in the coating processing liquid. .
Therefore, since it is possible to effectively prevent the shaft member and the object to be treated from being coated and cured by the coating treatment liquid, it is possible to easily cover the shaft member from the shaft member after the coating treatment liquid is cured. The processed product can be removed.

Also, aspects of the immersion bath is not particularly limited, As one example, the area of the opening is a value within the range of 200～5000Cm ^2, the depth is within the range of 50~300mm It is preferable to use a stainless steel immersion tank having a value within a range of 1 to 150 liters.
In addition, it is also preferable to make the bottom part of a dipping tank into the shape matched with the shape of the to-be-processed object from a viewpoint of eliminating the waste of a coating processing liquid.

Moreover, as shown to Fig.10 (a)-(c), the immersion tank 10 which can move to an up-down direction is arrange | positioned under the shaft member 40 formed by fixing a to-be-processed object, It is characterized by the above-mentioned. .
That is, the immersion tank 10 is disposed below the shaft member 40 that is detachably held between the rotation drive unit 20a and the bearing unit 20b in the rotation unit 20 (20a, 20b) and moves in the vertical direction. possible, characterized in that a.
The reason for this is that, by configuring in this way, the object to be processed is dip coated in a state of being sandwiched between the rotation drive part and the bearing part, and the object to be processed is pulled up from the coating treatment liquid and rotated as it is. This is because the coating treatment liquid can be scattered.
Therefore, as shown in FIGS. 10A to 10B, first, the immersion tank 10 is placed on the workpiece 50 (50a, 50b) held between the rotation drive unit 20a and the bearing unit 20b. The workpiece 50 (50a, 50b) can be immersed in the coating treatment liquid 11 by about half.
Next, in the state, the workpiece 50 (50a, 50b) is slowly rotated by, for example, a range of 10 to 30 rpm by the rotation driving unit 20a, and the entire workpiece 50 (50a, 50b) is coated. It can be immersed in the liquid 11.
Then, as shown in FIG. 10 (c), the immersion tank 10 is moved downward to bring the workpiece 50 (50a, 50b) and the coating treatment liquid 11 into a non-contact state, and then rotationally driven. The object 50 (50a, 50b) is rotated at a high speed by the unit 20 (20a, 20b), for example, 300 to 1000 rpm, and the excess coating solution is scattered by centrifugal force to be removed by rotation.
Note that the immersion tank can be moved up and down by a driving means such as a hydraulic cylinder.

Moreover, as shown to Fig.11 (a)-(c), the storage tank 12 which can accommodate the immersion tank 10 at the time of the coating processing liquid 11 being stored in the lower part of the immersion tank 10 and moving below is stored. It is characterized by providing.
Furthermore, the bottom of the dipping tank 10, opening and closing controllable valve member 14, and characterized by providing a communication hole 13, the.
The reason for this is that, as shown in FIGS. 11A to 11C, the coating treatment liquid 11 in the dipping tank 10 is moved in the vertical direction as shown in FIGS. This is because the coating treatment liquid 11 in the storage tank 12 is circulated and mixed to suppress deterioration of the coating treatment liquid 11 in the immersion tank 10 and to extend the life.
Therefore, stable surface treatment can be effectively maintained for a long time without frequently adding and adjusting a new coating treatment liquid to the immersion bath.

4). Air spraying means The dip coating apparatus according to the first embodiment, as shown in FIGS. 1A to 1B, is an air spraying means for spraying air onto the workpiece 50 (50a, 50b). 30.
The reason for this is that by providing such air spraying means, air is sprayed on the object being rotated by the rotating means to further remove the excess coating treatment liquid adhering to the object. It is because it can do.
That is, for example, when a workpiece having a complicated shape, such as a disc brake, and having a groove or opening for promoting cooling on its surface is dip coated, only centrifugal force by the rotating means is applied. Then, it becomes difficult to remove excess coating processing liquid.
This is due to, for example, the provision of a hull 53 in the disc brake 50 as shown in FIGS. 2A and 2B, and a groove and an opening (not shown) for promoting cooling. This is because excess coating processing liquid existing in the groove and opening for promoting cooling is prevented from being scattered to the outside by the structure of the workpiece 50 itself.
That is, according to the first embodiment, air is blown locally or entirely on the hat portion, the groove portion for promoting cooling, and the opening portion with the air blowing nozzle as well as the disk portion. The remaining coating liquid remaining can be forcibly scattered.

There is no particular limitation on the configuration of the air blowing means as long as the air can be blown locally or entirely on the portion where the coating treatment liquid tends to remain in accordance with the shape of the object to be processed. .
Therefore, for example, an air blowing nozzle and a fan can be mentioned.
The air blowing nozzle is connected to a compressor or the like via an air supply pipe, for example, and is within a range of 10 to 2500 liters / minute (0 ° C., 1 atm) under a condition of 0.1 to 0.8 MPa. Any spraying speed can be used, and any spraying speed within the range of 50 to 2000 liters / minute (0 ° C., 1 atm) can be obtained, more preferably 100 to 1500 liters / minute ( It is more preferable if the spraying speed within the range of 0 ° C., 1 atm) can be obtained.
In addition, regarding the form of the air blowing nozzle, it may be a wide air nozzle or a concentrated air nozzle.

The air blowing means is preferably a plurality of air blowing nozzles that can reciprocate.
The reason for this is that by configuring the air blowing means in this way, it is possible to more effectively remove excess coating treatment liquid that remains in the recesses of the workpiece and cannot be removed only by centrifugal force. Because.
That is, for example, as shown in FIGS. 12A to 12C, the air blowing nozzle 30 is disposed and reciprocated in the directions indicated by the respective arrows, so that the disc brake as the workpiece 50 is extra. This is because a simple coating treatment liquid can be removed more effectively.

5. Scattering prevention member Moreover, it is preferable that the dip coating apparatus of 1st Embodiment is provided with a scattering prevention member.
The reason for this is that the scattered coating treatment liquid can be efficiently recovered and reused while preventing the dip coating apparatus and its surroundings from being contaminated by the excess coating treatment liquid scattered by the rotating means. Because.
That is, for example, as shown in FIG. 1 (c), it is preferable to provide the scattering prevention member 60 so as to surround the upper surface of the rotating workpiece 50 (50 a, 50 b) and both side surfaces parallel to the rotation shaft 40. .
Moreover, as shown in FIG.1 (c), the shape of the scattering prevention member 60 surrounding the upper surface of the to-be-rotated to-be-processed object 50 (50a, 50b) is the roof type shape inclined downward toward the both sides from the center. It is preferable to do.
The reason for this is that the excess coating treatment liquid scattered by the rotation by the rotating means can be effectively followed and finally recovered efficiently in the immersion tank located below.
Moreover, as shown in FIG. 13, it is preferable to use a scattering prevention member 60 whose upper surface can be opened and closed.
The reason for this is that, in this way, it becomes easy to remove the processed object from the rotating means, and at the same time, it becomes easy to attach the unprocessed object to the rotating means.

6). Coating treatment liquid Also, the coating treatment liquid contains a coating component for forming a cured coating film on the surface of the object to be treated, and the coating component is adhered to the surface of the object to be treated and then solidified. Thus, a liquid material capable of forming a predetermined cured coating film on the surface of the object to be processed.
Such a coating treatment liquid can contain various thermoplastic components, thermosetting components, photocuring components, or a combination thereof as a coating component.
More specifically, as the coating component, acrylic resin, urethane resin, polyimide resin, epoxy resin, oxetane resin, polyester resin, polyamide resin, phenol resin, silicone resin, etc. One kind alone or a combination of two or more kinds may be mentioned.
Furthermore, when the object to be treated is a disc brake, one or more curing components that can be polymerized with a polyimide resin precursor such as polyamic acid, a polyimide resin, and a polyimide resin such as an epoxy compound or an epoxy resin. It is preferable that it is the solution or dispersion liquid containing the polyimide resin composition containing these.

Further, as a solvent, sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, N, N-dimethylformamide, N, N-diethylformamide, N, N-dimethylacetamide, N, N-diethylacetamide, N-methyl-2- Examples include polar solvents such as pyrrolidone (NMP), phenol, cresol, xinol, halogenated phenol, catechol, hexamethylphosphoramide, γ-butyrolactone (GBL), tetrahydrofuran, etc. More preferably, water or alcohol (including glycol) is used.
That is, by using water or the like as the solvent, the coating treatment liquid can be made aqueous, so that not only the manufacturing cost is reduced, but also environmental problems can be taken into consideration.
Therefore, when the coating component contained in these coating treatment liquids is solidified, it is possible to form a predetermined coating film made of polyimide resin, epoxy resin, or the like.
In addition, the concentration of the solvent or the dispersion medium in the coating treatment liquid is preferably a dilute liquid of 5 to 50% by weight, for example, with respect to the total amount of the coating treatment liquid, and a value within the range of 10 to 35% by weight. It is more preferable to set the value within the range of 15 to 25% by weight.

Moreover, it is preferable that the viscosity of the coating treatment liquid (measurement temperature: 25 ° C., hereinafter the same) is usually set to a value in the range of 10 to 10,000 mPa · sec.
This is because a coating treatment liquid having such a viscosity can uniformly adhere droplets to an object to be processed.
That is, if the viscosity of the coating treatment liquid is less than 10 mPa · sec, it may be difficult to form a coating having a uniform thickness as a whole due to the surface tension.
On the other hand, if the viscosity of the coating treatment liquid exceeds 10,000 mPa · sec, it may be difficult to remove the excess coating treatment liquid by centrifugal force.
Therefore, the viscosity of the coating treatment liquid is more preferably set to a value within the range of 50 to 5000 mPa · sec, and further preferably set to a value within the range of 100 to 1000 mPa · sec.

[Second Embodiment]
The second embodiment is a dip coating method for applying a coating treatment liquid to the surface of an object to be processed, which includes the following steps (a) to (c).
(A) An object to be processed is disposed below the shaft member in a state in which the object to be processed is fixed, and is an immersion tank that is movable in the vertical direction, and the coating treatment liquid is stored in the lower part of the immersion tank. And a storage tank capable of accommodating the immersion tank when moved downward, and further, accommodated in an immersion tank provided with a valve member capable of opening and closing and a communication hole at the bottom of the immersion tank. Step of immersing in the coating treatment liquid (sometimes referred to as an immersion step)
(B) A rotational drive unit for holding the shaft member in a state where the workpiece has a horizontal rotation shaft and the workpiece to be processed is fixed on the rotation shaft, and a bearing unit. , And a step of removing the excess coating treatment liquid adhering to the object to be processed by scattering by centrifugal force (sometimes referred to as a rotation removal step).
(C) A step of blowing excess air to the object to be processed being rotated by the rotating means by the air blowing means, and further removing the excess coating treatment liquid adhering to the object to be processed (air removing process and May be called.)
Hereinafter, the dip coating method as the second embodiment will be described in detail with reference to the drawings as appropriate, omitting the same contents as those in the first embodiment.

1. Step (a) (immersion step)
Step (a) is a step of immersing the object to be processed in the coating treatment liquid accommodated in the immersion tank.
At this time, as shown to Fig.10 (a)-(c), the immersion tank 10 is with respect to the to-be-processed object 50 (50a, 50b) of the state clamped by the rotation drive part 20a and the bearing part 20b. It is preferable that the workpiece 50 (50a, 50b) is immersed in the coating treatment liquid 11 by about half by moving it upward.
Next, it is preferable that the workpiece 50 (50a, 50b) is slowly rotated by the rotation drive unit 20a while the state is maintained, and the entire workpiece is immersed in the coating treatment liquid 11.
The rotation speed at this time is preferably set to a value within the range of 10 to 30 rpm.
Moreover, as immersion time, it is preferable to set it as the value within the range of 1-10 seconds, and it is more preferable to set it as the value within the range of 3-5 seconds.
Finally, the immersion tank 10 is moved downward to bring the workpiece 50 (50a, 50b) and the coating treatment liquid 11 into a non-contact state, and the subsequent steps (b) and (c) are performed. It is preferable to migrate.
In addition, from the viewpoint of more effectively suppressing the coating treatment liquid from moving downward due to gravity, the workpiece 50 (50a, 50b) is continuously rotated when the immersion bath 10 is moved downward. Is preferred.

2. Step (b) (Rotation removal step)
Next, in the step (b), as shown in FIGS. 5A to 5B, the workpiece 50 (50a, 50b) is rotated by the rotating means 20 (20a, 20b), and the workpiece is processed. This is a step of removing the excess coating treatment liquid adhering to the object 50 (50a, 50b) by scattering by centrifugal force.
At this time, the rotational speed of the rotating means varies depending on the type and viscosity of the liquid to be treated, but is preferably set to a value in the range of 300 to 1000 rpm.
The reason for this is that when the rotational speed is less than 300 rpm, it may be difficult to remove the excessive coating treatment liquid adhering to the object to be processed by sufficiently scattering. On the other hand, when the rotation speed exceeds 1000 rpm, the coating treatment liquid adhering to the object to be processed may be excessively removed, or the rotating shaft of the object to be processed may be easily shaken. is there.
Therefore, the rotation speed of the rotating means is more preferably set to a value within the range of 350 to 800 rpm, and further preferably set to a value within the range of 400 to 600 rpm.

3. Step (c) (Air removal step)
Next, in the step (c), as shown in FIGS. 12A to 12C, air is blown by the air blowing means 30 onto the workpiece 50 being rotated by the rotating means, and the object to be treated is blown. This is a step of further removing the excess coating processing liquid adhering to the processed product 50.
In addition, since this process (c) is implemented in the state which rotated the to-be-processed object by the rotation means, it will be implemented simultaneously with the process (b) mentioned above.

At this time, as shown in FIGS. 12A to 12C, the air blowing means 30 is a plurality of air blowing nozzles capable of reciprocating movement, and is locally applied to the recesses in the workpiece 50. It is preferable to blow air on the surface.
This is because the surface treatment can be performed more uniformly on the workpiece by carrying out in this way.
In addition, when the air blowing means moves in the center direction of the object to be processed, the air blowing is stopped, and only when the air blowing means moves in the outer peripheral direction of the object to be processed, air is blown. Is preferred.
The reason for this is that, by carrying out in this way, excess coating treatment liquid remaining in the recesses or the like can be effectively scraped out by air and scattered and removed by centrifugal force.

Moreover, it is preferable to set it as the value within the range of 100-2500 liter / min (0 degreeC, 1 atm) as an air spraying speed.
The reason for this is that when the air blowing speed is less than 100 liters / minute (0 ° C., 1 atm), it may be difficult to sufficiently remove the excess coating treatment liquid remaining in the recesses of the workpiece. Because there is. On the other hand, when the air blowing speed exceeds 2500 liters / minute (0 ° C., 1 atm), the coating treatment liquid adhering to the workpiece may be excessively removed.
Therefore, it is more preferable to set the air blowing speed to a value in the range of 400 to 2000 liters / minute (0 ° C., 1 atm), and to a value in the range of 1000 to 1800 liters / minute (0 ° C., 1 atm). Is more preferable.

4). Curing Step In addition to the steps (a) to (c) described above, the coating treatment liquid applied to the object to be processed is dried and a curing step for solidifying the coating components contained in the coating treatment liquid is performed. It is preferable.
That is, in this curing process, after removing the solvent and the like from the coating treatment liquid dip-coated on the surface of the object to be treated, the coating components contained in the coating treatment liquid are subjected to three-dimensional crosslinking using heat or light. This is a step of hardening.
Here, the mode of the curing step is not particularly limited, but for example, it is preferable to use a belt conveyor type curing device 100 as shown in FIGS.
This is because the workpieces dip-coated by the dip coating apparatus can be sequentially fed into a belt conveyor type curing apparatus as they are to perform a curing process stably and quickly.

Moreover, when implementing this hardening process, it is preferable to carry out in a state with the to-be-processed object fixed to the shaft member.
That is, by carrying out in this way, for example, it is possible to move the workpiece by sandwiching the shaft member portion using a moving tool such as a traverse.
Therefore, the object to be processed can be moved from the dip coating apparatus to the curing apparatus without directly touching the undried coating treatment liquid applied to the object to be processed. Moreover, by implementing in this way, a to-be-processed object can be stably and rapidly mounted with respect to a hardening apparatus.
In addition, it is preferable to similarly perform such a moving method of a to-be-processed object also in the movement to the cooling device mentioned later from a hardening device.

Hereinafter, the curing conditions will be described in detail by taking as an example the case where the coating component is thermally cured using the belt conveyor type curing device shown in FIGS. 14 (a) to 14 (b).
First, the curing temperature of the coating component is preferably set to a value within the range of 100 to 500 ° C.
This is because when the curing temperature is less than 100 ° C., it may be difficult to sufficiently cure the coating component contained in the coating treatment liquid, or the curing time may be excessively long. .
On the other hand, when the curing temperature exceeds 500 ° C., the degree of curing in the film thickness direction may be uneven, or bubbles may be easily formed in the coating film.
Therefore, the curing temperature of the coating component is more preferably set to a value within the range of 200 to 400 ° C, and further preferably set to a value within the range of 250 to 350 ° C.
In addition, although it does not restrict | limit especially as a heating means at the time of hardening a coating component, For example, a gas oven, an electric heating oven, an infrared heater, heating steam, heating inert steam, etc. can be used.

Moreover, it is preferable to make the heating time of a coating component into the value within the range of 5 to 20 minutes.
This is because if the heating time is less than 5 minutes, it may be difficult to sufficiently cure the coating component contained in the coating treatment liquid. On the other hand, when the heating time exceeds 20 minutes, the cured coating film may be easily damaged or the coating film may be excessively contracted and easily peeled off.
Accordingly, the heating time of the coating component is more preferably set to a value within the range of 8 to 18 minutes, and further preferably set to a value within the range of 10 to 15 minutes.

Moreover, it is preferable to make the conveyance speed of the to-be-processed object at the time of implementing a hardening process into the value within the range of 100-800 mm / min.
The reason for this is that when the conveyance speed of the object to be processed is a value of less than 100 mm / min, the curing process becomes rate-limiting and it may be difficult to perform dip coating efficiently. On the other hand, when the conveyance speed of the object to be processed is a value exceeding 800 mm / min, the length of the curing device in the conveyance direction becomes excessively large, which may cause a space problem.
Therefore, it is more preferable to set the conveyance speed of the workpiece to a value within the range of 300 to 700 mm / min.

Moreover, as shown to Fig.14 (a)-(b), arrangement | positioning of the to-be-processed object 50 in the hardening apparatus 100 is made into 2 rows, and the to-be-processed object 50 in each row | line | column is located in a staggered form. It is preferable to arrange in.
The reason for this is that by arranging the objects to be processed in a staggered manner in this way and carrying out the curing process, the length of the curing device in the transport direction is halved, while the objects to be processed in each row are uniformly distributed. This is because the coating treatment liquid can be stably cured by heating.
In addition, it is preferable to make the length in the conveyance direction of the hardening apparatus 100 into the value within the range of 5-10m.

5. Cooling process It is preferable to implement the cooling process of a to-be-processed object after a hardening process. That is, this cooling process is a process of cooling the object heated in the curing process to room temperature.
Here, although the aspect of this cooling process is not specifically limited, For example, as shown to Fig.14 (a), it is preferable to use the belt conveyor type cooling device 200. FIG.
The reason for this is that the object to be processed, which has been cured with the coating treatment liquid in the curing device, can be sequentially charged and subjected to the curing process.
Further, when the length in the transport direction is the same as that of the curing device 100 and the arrangement of the objects to be processed 50 is one row, the transport speed is twice the transport speed in the curing device 100, as illustrated. In addition, the timing of unloading the workpiece can be handled.
By doing in this way, it becomes easy to implement a dip coating, a hardening process, and a cooling process at a fixed speed, without retaining a processed material on the way.
Further, by automating the movement of the workpiece between the processes, the work area by the worker can be concentrated around the dip coating apparatus, and the work efficiency can be improved.
Furthermore, since the conveyance speed in the cooling process is twice that in the curing process, the workpiece can be cooled at a sufficient speed even at room temperature.

Moreover, it is preferable to make the film thickness of a coating film into the value within the range of 3-15 micrometers regarding the coating film formed on the surface of a to-be-processed object.
The reason for this is that when the film thickness is less than 3 μm, a portion where the coating film is not formed is likely to occur or the coating film may be easily peeled off. On the other hand, if the film thickness exceeds 15 μm, it may be difficult to make the film thickness uniform or the coating film may be easily peeled off.
Therefore, it is more preferable to set the film thickness of the coating film formed on the surface of the workpiece to a value within the range of 3 to 10 μm.

Furthermore, when forming such a coating film, it is preferable to make the processing amount of a coating processing liquid into the value within the range of 0.03-0.15 ml per 100 cm < ² > of surface area of a to-be-processed object.
The reason for this is that when the treatment amount of the coating treatment liquid is less than 0.03 ml per predetermined surface area, the film thickness of the coating film becomes excessively small, and a portion where the coating film is not formed tends to occur. This is because the film may be easily peeled off. On the other hand, when the amount of the coating treatment liquid exceeds 0.15 ml per predetermined surface area, the film thickness of the coating film becomes excessively large, and it becomes difficult to make the film thickness uniform. This is because the coating film may be easily peeled off.
Therefore, the treatment amount of the coating treatment liquid is more preferably set to a value within the range of 0.03 to 0.1 ml per 100 cm ² of the surface area of the workpiece.

  Hereinafter, the present invention will be described in more detail with reference to examples.

[Example 1]
1. Formation of cured coating film Using the dip coating apparatus shown in FIG. 1, the coating treatment liquid was applied to the surface of the vehicle disc brake (material: iron, diameter: 25 cm, thickness: 3 cm, weight: 2 kg) shown in FIG. Under the following conditions, as shown in Table 1, the coating thickness was dip-coated while rotating the vehicle disc brake with the rotating means as shown in Table 1 so that the coating thickness was the following numerical value.
Then, the dipped and applied vehicle disc brake is rotated by a rotating means at a rotation speed of 2 to disperse the adhering excess coating treatment liquid by centrifugal force, and the air nozzles shown in FIG. ) Was sprayed with air under predetermined conditions to remove excess coating solution on the surface irregularities.
Finally, using the curing apparatus shown in FIG. 14, the coating component contained in the coating treatment liquid was thermally cured to form a cured coating film having a thickness of 7 μm.
Rotational speed 1: 20 rpm
Coating treatment liquid: thermosetting epoxy water-based paint (viscosity: 3000 mP · sec (measurement temperature 2
5 ° C.), solid content: 50% by weight)
Rotational speed 2: 800 rpm
Air volume: 400 liters / minute (per air blowing nozzle)

2. Evaluation of cured coating (1) Smoothness 1
The smoothness of the cured coating film formed on the disk portion (FIG. 15: point a) of the vehicle disk brake was evaluated according to the following criteria.
A: The film thickness variation (maximum-minimum) at seven locations is less than 2 μm.
A: The film thickness variation (maximum-minimum) at seven locations is less than 4 μm.
(Triangle | delta): The variation (maximum-minimum) of the film thickness of seven places is less than 6 micrometers.
X: The film thickness variation (maximum-minimum) at seven locations is 8 μm or more.

(2) Smoothness 2
The smoothness of the cured coating film formed on the hat part (FIG. 15: point b) of the vehicle disc brake was evaluated according to the following criteria.
A: The film thickness variation (maximum-minimum) at seven locations is less than 3 μm.
A: The film thickness variation (maximum-minimum) at seven locations is less than 5 μm.
(Triangle | delta): The dispersion | variation (maximum-minimum) of the film thickness of seven places is less than 8 micrometers.
X: The film thickness variation (maximum-minimum) at seven locations is 10 μm or more.

[Example 2]
In Example 2, the smoothness and adhesion of the cured coating film formed on the brake part and the concavo-convex part of the vehicle disc brake were the same as in Example 1 except that the rotational speed 1 during dip coating was 15 rpm. Evaluated.

[Example 3]
In Example 3, the smoothness and adhesion of the cured coating film formed on the brake part and the uneven part of the vehicle disc brake were the same as in Example 1 except that the rotational speed 1 during dip coating was 10 rpm. Evaluated.

[Example 4]
In the fourth embodiment, except for the rotation speed 2 when the extra coating treatment liquid adhering is scattered by centrifugal force is set to 300 rpm, the brake portion and the uneven portion of the vehicle disk brake are applied to the brake portion and the uneven portion as in the first embodiment. The smoothness and adhesion of the formed cured coating film were evaluated.

[Example 5]
In Example 5, except for the rotation speed 2 when the extra coating treatment liquid adhering was scattered by centrifugal force was set to 500 rpm, it was applied to the brake part and the uneven part of the vehicle disc brake as in Example 1. The smoothness and adhesion of the formed cured coating film were evaluated.

[Example 6]
In Example 6, the smoothness and adhesion of the cured coating film formed on the brake part and the uneven part of the vehicle disc brake were evaluated in the same manner as in Example 1 except that the air amount was 500 liters / minute. .

[Example 7]
In Example 7, the smoothness and adhesion of the cured coating film formed on the brake part and the uneven part of the vehicle disc brake were evaluated in the same manner as in Example 1 except that the air amount was 300 liters / minute. .

[Example 8]
In Example 8, the smoothness and adhesion of the cured coating film formed on the brake part and the uneven part of the vehicle disc brake were evaluated in the same manner as in Example 1 except that the air amount was 200 liters / minute. .

[Comparative Example 1]
In Comparative Example 1, the excess coating treatment liquid adhering to the object to be treated was rotated at a rotational speed of 2 at the time of scattering by centrifugal force at 0 rpm, that is, similar to Example 1, except that the rotational treatment was not performed. The smoothness and adhesion of the cured coating film formed on the brake part and the uneven part of the vehicle disc brake were evaluated.

[Comparative Example 2]
In Comparative Example 2, the amount of air was 0 liters / minute, that is, no air treatment was performed, and the cured coating film formed on the brake part and the uneven part of the vehicle disc brake was smooth as in Example 1. And adhesion were evaluated.

According to the dip coating apparatus of the present invention and the dip coating method using the dip coating apparatus, by providing a predetermined immersion tank, a rotating means, and an air blowing means, it is a heavy object like a disc brake, and A predetermined central axis is assumed even for an object to be processed having a complicated shape, and if the object to be processed has a shape that can rotate around the center axis, the coating treatment liquid can be uniformly and easily applied. I was able to do it.
Therefore, the dip coating apparatus and the dip coating method of the present invention can significantly contribute to the efficiency of surface treatment of various machine parts such as disc brakes in automobiles, motorcycles, bicycles, railway vehicles, aircrafts, and the like. Be expected.

DESCRIPTION OF SYMBOLS 1: Dip coating apparatus, 10: Immersion tank, 11: Coating processing liquid, 12: Storage tank, 13: Communication hole, 14: Valve member, 20 (20a, 20b): Rotating means, 20a: Rotation drive part, 20b: Bearing part, 21: Rotating shaft, 22: Direction of rotation, 23a: Drive protrusion, 23b: Bearing protrusion, 24: Plate-like part, 24 ': Pointed inclined part, 25 rod-like part, 30: Air blowing means, 40 : Shaft member, 40a: driving end, 40b: bearing end, 42: shaft core member, 42a: shaft core end, 45: bifurcated portion, 45 ': pointed inclined portion, 46: shaft core cavity, 43 (43a, 43b, 43c): fixing member, 43 '(43'a, 43'b, 43'c): clamping part, 45: mounting member, 50 (50a, 50b): workpiece (disc brake) 55: virtual central axis, 60: scattering prevention member, 100: curing device , 200: cooling equipment

Claims (8)

An immersion tank for immersing the workpiece in the coating treatment liquid;
Rotating means for rotating the object to be processed around the virtual center axis of the object to be processed, and for removing the excess coating treatment liquid adhering to the object to be processed by scattering by centrifugal force;
An air blowing means for further removing excess coating treatment liquid adhering to the object to be treated by blowing air to the object to be treated being rotated by the rotating means;
Equipped with a,
The rotation means has a horizontal rotation shaft, and a rotation drive unit for detachably holding the shaft member on which the workpiece is fixed on the rotation shaft, a bearing unit, With
The immersion tank is disposed below the shaft member in a state where the object to be processed is fixed, is movable in the vertical direction, and
In the lower part of the immersion tank, the coating treatment liquid is stored, and provided with a storage tank that can accommodate the immersion tank when moved downward,
A dip coating apparatus characterized in that a valve member capable of opening and closing and a communication hole are provided at the bottom of the immersion tank . The rotational drive part is detachable in the rotational axis direction with respect to the drive end part provided at the end part of the shaft member, and has a drive projection part for fitting in a fixed state in the rotational direction. And
A bearing projection for fitting the bearing portion so as to be detachable in the rotation axis direction and to be rotatable in the rotation direction with respect to the bearing end portion provided at the other end portion of the shaft member. The dip coating apparatus according to claim 1 , comprising: The shaft member includes a shaft core member and a plurality of fixing members for fixing the workpiece to the shaft core member, and each of the fixing members is penetrated by the shaft core member. 3. The cylindrical object according to claim 1, further comprising a sandwiching portion for sandwiching the object to be processed disposed between the fixed members in the axial direction of the shaft member. Dip coating equipment. The dip coating apparatus according to any one of claims 1 to 3 , wherein the air spray means is a plurality of air spray nozzles capable of reciprocating motion. The object to be processed is a disc shape or a substantially disc shape, and two disc brakes having an opening at the center thereof, and the two disc brakes face each other symmetrically. The dip coating apparatus according to claim 1 , wherein the dip coating apparatus is fixed to the shaft member. A dip coating method for applying a coating treatment liquid to the surface of a workpiece,
A dip coating method comprising the following steps (a) to (c):
(A) The object to be processed is disposed below the shaft member in a state in which the object to be processed is fixed, and is an immersion tank movable in the vertical direction. A storage tank that can store the immersion tank when the processing liquid is stored and moves downward, and further includes a valve member that can be controlled to open and close, and a communication hole at the bottom of the immersion tank. The step (b) of immersing the coating treatment liquid accommodated in the immersion bath, which has the horizontal axis of rotation, and the shaft member in a state where the workpiece is fixed, It is rotated by a rotating means having a rotation drive unit for detachably holding on the rotating shaft and a bearing unit, and the excess coating processing liquid adhering to the object to be processed is scattered by centrifugal force. (C) rotating by the rotating means With respect to the object to be processed state, blowing air by an air blowing means, the excess coating treatment solution, the step of further removing The dip coating method according to claim 6 , wherein a rotation speed of the rotating means is set to a value within a range of 300 to 1000 rpm. The dip coating according to claim 6 or 7 , wherein the air spraying means is a plurality of air spraying nozzles capable of reciprocating motion, and air is sprayed locally to the recesses in the workpiece. Method.

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