JP2016137437A - Coating apparatus and coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus capable of improving a yield of a coating.SOLUTION: A coating apparatus 10 comprises: a coating container 1 storing a coating L in which a coated part 91 of a workpiece 9 is immersed; a rotary table 2 in which the coating container 1 is installed and which is rotatable along with the coating container 1; a first rotation drive unit 3 which drives the rotary table 2 to rotate in such a manner that a coating liquid level within the coating container 1 forms a rotation paraboloidal surface; a workpiece holding section 4 which can hold a non-coated part 92 of the workpiece 9 and which can rotate along with the workpiece 9 about a rotational axis R2 parallel to a rotational axis R1 of the rotary table 2; and a second rotation drive unit 5 which drives the workpiece holding section 4 to rotate. When the workpiece 9 and the coating container 1 rotate after the coated part 91 of the workpiece 9 is immersed in the coating L and pulled up from the coating L, the coating flying off from the workpiece 9 arrives at the coating liquid level that forms the rotation paraboloidal surface and is recovered in the coating L within the coacting container 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating apparatus and a coating method.

  Conventionally, a coating method is known in which a work is immersed in a paint in a container and then rotated while the work is pulled up from the paint (see, for example, Patent Document 1). According to such a method, a coating film having a uniform thickness is formed on the surface of the workpiece.

JP 2003-275645 A

  However, the paint splashed from the workpiece by centrifugal force adheres to the inner wall of the container and solidifies as the solvent evaporates as it is. For this reason, it is difficult to reuse the paint scattered from the work, and the yield of the paint is reduced.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a coating apparatus and a coating method capable of improving the yield of paint.

  The coating apparatus of the present invention includes a paint container for storing paint in which a paint part of a work is immersed, a turntable in which the paint container is installed and rotatable with the paint container, and the paint liquid level in the paint container is rotated freely. It can hold the first rotation drive unit that rotates the turntable so as to form the object surface, and the non-painted part of the work, and can rotate with the work around the rotation axis parallel to the rotation axis of the turntable. There is provided a certain work holding part and a second rotation driving part for rotationally driving the work holding part.

  In the above configuration, the paint portion of the work is applied to the surface of the workpiece by being immersed in the paint in the paint container. Then, when the work holding unit holds the non-painted part of the work and at least a part of the painted part of the work is separated from the paint, the second rotation driving unit starts driving, and the work holding part rotates together with the work. The excessive paint applied to the workpiece is scattered and drained by the centrifugal force.

  Further, in the above configuration, when the first rotation driving unit starts driving and the turntable rotates together with the paint container, the paint liquid level in the paint container is rotated around the rotation axis by the centrifugal force. Form. That is, the paint liquid surface forms a curved surface with a recessed center so as to cover the inner wall of the paint container.

Therefore, according to the above configuration, when the workpiece and the paint container rotate about the rotation axes parallel to each other, the paint splash scattered from the work can reach the paint liquid level covering the inner wall of the paint container. Is possible. Thereby, it is possible to collect paint splashes scattered from the work in the paint in the paint container while forming a coating film having a uniform thickness on the surface of the work. As a result, since the collected paint can be reused, the yield of paint can be improved.
In the present specification, “parallel” of two rotation axes includes being coaxial.

Further, according to the present invention, there is provided a dipping step of immersing the coating portion of the work in the paint stored in the paint container, and a first rotation of the paint container so that the paint liquid surface forms a paraboloid after the dipping step. A second rotation stage for rotating the work around a rotation axis parallel to the rotation axis of the paint container with at least a part of the coating portion of the work being separated from the paint between the rotation stage and the first rotation stage; A coating method is provided.
This coating method has the same effect as the above-described coating apparatus.

It is a schematic diagram of the coating device by one Embodiment of this invention. It is a schematic diagram for demonstrating the coating method by one Embodiment of this invention.

(One embodiment)
Hereinafter, a coating apparatus and a coating method according to an embodiment of the present invention will be described with reference to the drawings. This coating apparatus and coating method apply a paint to the surface of a work having a rotationally symmetric outer shape.

First, a schematic configuration of the coating apparatus 10 will be described with reference to FIG.
The coating apparatus 10 includes a paint container 1, a turntable 2, a first rotation drive unit 3, a work holding unit 4, a second rotation drive unit 5, a lift drive unit 6, and the like. The workpiece 9 has a rotationally symmetric outer shape such as a cylindrical shape. The surface of the work 9 is divided into a painted portion 91 where paint is applied on one side in the axial direction and a non-painted portion 92 where paint is not applied on the other side.

  The coating apparatus 10 is installed with the vertical direction in FIG. 1 as the vertical direction, and the workpiece 9 can be moved in the vertical direction so that the coating portion 91 of the workpiece 9 is immersed (dip) in the coating material L in the coating material container 1. Is possible. In the following, the upward direction of the paper surface in FIG.

  The paint container 1 is a container in which the paint L can be stored and at least a part of the paint container 1 is opened. Here, “paint L” refers to a liquid paint accumulated in the paint container 1.

  The turntable 2 includes a pedestal portion 21 on which the paint container 1 is installed and a shaft portion 22 that extends downward from the pedestal portion 21. The turntable 2 can rotate together with the paint container 1 around the shaft portion 22. The rotation axis of the turntable 2 is R1.

  The 1st rotation drive part 3 is a motor, for example, and the axial part 22 of the turntable 2 is connected. The first rotation drive unit 3 can rotationally drive the turntable 2.

The work holding unit 4 includes a chuck 41 that can grip and detach the work 9 and a shaft 42 that extends upward from the chuck 41. The chuck 41 can grip the non-painted portion 92 in a state where the painted portion 91 of the workpiece 9 is disposed on the lower side and the non-painted portion 92 is disposed on the upper side.
Further, the work holding unit 4 can rotate together with the work 9 around the shaft part 42 in a state where the chuck 41 holds the work 9. The rotation axis of the work holding unit 4 is R2.
The rotation axes R1 and R2 are at least parallel to each other, preferably coaxial.

  The 2nd rotation drive part 5 is a motor, for example, and the shaft part 42 of the workpiece | work holding | maintenance part 4 is connected. The second rotation drive unit 5 can rotationally drive the workpiece holding unit 4.

  The elevating drive unit 6 is a mechanism that allows the work holding unit 4 to elevate in the vertical direction, such as a vertical movement cylinder. The elevation drive unit 6 of the present embodiment holds the second rotation drive unit 5 and raises and lowers the work holding unit 4 and the second rotation drive unit 5 together.

Next, a method for coating the workpiece 9 by the coating apparatus 10 will be further described with reference to FIG.
First, an appropriate amount of paint L is stored in the paint container 1, and the work 9 is positioned above the paint liquid level LP in a state where the chuck 41 grips the non-painted portion 92 of the work 9 (see FIG. 1).

  Next, the workpiece holding unit 4 is moved downward by the elevating drive unit 6, whereby the coating portion 91 of the workpiece 9 is immersed in the paint L (immersion stage, see FIG. 2A). By managing the immersion depth at this time, the coating portion 91 of the workpiece 9 is reliably applied.

  Next, the 1st rotation drive part 3 starts a drive, and the turntable 2 rotates with the coating material container 1. FIG. By this centrifugal force, the coating liquid surface LP forms a paraboloid of revolution centered on the rotation axis R2 (see the first rotation stage, FIG. 2B). That is, the coating liquid level LP forms a curved surface with a recessed center so as to cover the inner wall 12 of the coating container 1.

  In addition, about the rotation speed of the 1st rotation drive part 3, the magnitude | size of the coating material container LP, the quantity of the coating material L, the magnitude | size of the workpiece | work 9, and the coating liquid level LP which can position the workpiece | work 9 described below are mentioned. It can be set as appropriate based on the shape and the like.

  Next, the work holding unit 4 is moved upward by the elevating drive unit 6. At this time, the elevating drive unit 6 moves the workpiece 9 so that the coating portion 91 of the workpiece 9 is positioned below the edge LE of the coating liquid level LP forming the rotating paraboloid while being separated from the coating L. 9 is positioned (positioning step, see FIG. 2B).

Positioning of the workpiece 9 may be performed by visual observation of an operator or a camera. The appropriate position of the work holding unit 4 is determined in advance according to the shape of the coating liquid level LP calculated based on the number of rotations of the first rotation driving unit 3, the size of the coating material container 1, the amount of the coating material L, and the like. It may be set.
If the position of the workpiece 9 is appropriate when the coating liquid surface LP forms a rotating paraboloid by the rotation of the coating container 1, the workpiece holding unit 4 may not move upward.

  Next, the second rotation driving unit 5 starts driving, and the work holding unit 4 rotates together with the work 9. Due to this centrifugal force, the excessive paint applied to the coating portion 91 of the workpiece 9 is scattered and drained (second rotation stage, see FIG. 2B). The paint splash LS scattered from the paint part 91 reaches the paint liquid level LP covering the inner wall 12 of the paint container 1 and is collected by the paint L.

After the liquid is sufficiently drained, the second rotation drive unit 5 stops driving, and the work holding unit 4 stops rotating. And the workpiece holding part 4 moves upward by the raising / lowering drive part 6, and pulls up the workpiece | work 9 from the coating material container 1 (a raising stage, refer FIG.2 (c)). Thereafter, the chuck 41 removes the painted workpiece 9 and grips a new workpiece 9.
Further, in the pulling stage, after the workpiece 9 has moved sufficiently upward, the first rotation driving unit 3 stops driving and the turntable 2 stops rotating. Here, “when the workpiece 9 has moved sufficiently upward” means, for example, when the workpiece 9 has moved upward relative to the liquid level when the coating liquid level LP is in a stationary state.

(effect)
The effects of the coating apparatus 10 and the coating method of this embodiment will be described.
(1) As described above, the coating apparatus 10 of the present embodiment is provided with the coating material container 1 for storing the coating material L in which the coating portion 91 of the workpiece 9 is immersed, and the coating material container 1, and can be rotated together with the coating material container 1. The rotary table 2, the first rotary drive unit 3 that rotationally drives the rotary table 2 so that the coating liquid level LP in the paint container 1 forms a parabolic surface, and the non-painted portion 92 of the work 9. A workpiece holder 4 that can rotate with the workpiece 9 around a rotation axis R2 parallel to the rotation axis R1 of the turntable 2, a second rotation drive unit 5 that drives the workpiece holder 4 to rotate, It has.

  In the above configuration, the paint portion 91 of the work 9 is immersed in the paint L in the paint container 1, whereby the paint is applied to the surface thereof. Then, in a state where the workpiece holding unit 4 holds the non-painted portion 92 of the workpiece 9 and at least a part of the painted portion 91 of the workpiece 9 is separated from the paint L, the second rotation driving unit 5 starts driving, When the holding unit 4 rotates together with the workpiece 9, the excessive paint applied to the workpiece 9 is scattered by the centrifugal force and is drained.

  In the above configuration, when the first rotation driving unit 3 starts driving and the turntable 2 rotates together with the paint container 1, the paint liquid level LP in the paint container 1 is centered on the rotation axis R1 by the centrifugal force. A paraboloid of revolution is formed. That is, the coating liquid level LP forms a curved surface with a recessed center so as to cover the inner wall 12 of the coating container 1.

  Therefore, according to the above configuration, the paint splashes LS scattered from the work 9 are coated with the paint 9 covering the inner wall 12 of the paint container 1 by rotating the work 9 and the paint container 1 around rotation axes parallel to each other. It is possible to reach the liquid level LP. Thereby, the paint splash LS scattered from the work 9 can be collected in the paint L in the paint container 1 while forming a coating film having a uniform thickness on the surface of the work 9. As a result, since the collected paint can be reused, the yield of paint can be improved.

(2) The coating apparatus 10 according to the present embodiment further includes an elevating drive unit 6 that moves the work holding unit 4 relative to the paint container 1 in the vertical direction. Thereby, it is possible to easily move the workpiece 9 relative to the paint container 1 in the above-described immersion stage, positioning stage, and pulling stage.

(3) In the present embodiment, the elevating drive unit 6 is positioned below the edge LE of the coating liquid level LP forming the rotating paraboloid surface while the coating portion 91 of the workpiece 9 is spaced from the coating material L. Thus, the workpiece 9 can be positioned.
According to the above configuration, the paint splash LS that is scattered from the work 9 does not adhere to the inner wall 12 of the paint container 1, and the paint splash LS can be reliably collected in the paint L in the paint container 1.

(4) In the coating method of the present embodiment, the coating liquid surface LP forms a paraboloidal surface after the immersion stage in which the coating portion 91 of the workpiece 9 is immersed in the coating material L stored in the coating container 1 and the immersion stage. During the first rotation stage for rotating the paint container and the first rotation stage, the rotation axis R2 parallel to the rotation axis R1 of the paint container 1 is set in a state where the coating portion 91 of the workpiece 9 is separated from the paint L. A second rotation stage in which the workpiece 9 is rotated about the center.
Thereby, there exists an effect similar to the effect (1) of the coating device 10 mentioned above.

(5) Further, in the coating method of the present embodiment, during the first rotation stage and before the start of the second rotation stage, the coating part 91 of the work 9 forms a paraboloid of surface while being separated from the paint L. It further includes a positioning step of positioning the workpiece 9 so as to be positioned below the edge LE of the coating liquid level LP.
Thereby, there exists an effect similar to the effect (3) of the coating device 10 mentioned above.

(Other embodiments)
The coating apparatus 10 may not include the lifting / lowering driving unit 6 that moves the workpiece holding unit 4 up and down. For example, the coating apparatus 10 may have a mechanism for raising and lowering the paint container 1 as an elevation drive unit. Further, the dipping stage and the lifting stage of the workpiece 9 may be performed by other means.

  In the above embodiment, the work 9 is rotated in the second rotation stage after the work 9 is positioned so that the coating portion 91 of the work 9 is separated from the paint L in the positioning stage. However, the present invention is not limited to this. I can't. For example, the work 9 may be rotated while the work 9 is pulled up from the paint L in the second rotation stage without performing the positioning stage.

  In addition, when the paint splash LS scattered from the work 9 is expected to move downward due to gravity, the coating portion 91 of the work 9 has an edge of the paint liquid surface LP forming a rotating paraboloid at the positioning stage. It may be positioned above LE.

  As mentioned above, this invention is not limited to each above-mentioned embodiment, In the range which does not deviate from the meaning of invention, it can implement with a various form.

DESCRIPTION OF SYMBOLS 1 ... Paint container 2 ... Turntable 3 ... 1st rotation drive part 4 ... Work holding part 5 ... 2nd rotation drive part 10 ... Coating apparatus

Claims (5)

A paint container (1) for storing paint in which a paint part (91) of the work (9) is immersed;
A turntable (2) in which the paint container is installed and rotatable with the paint container;
A first rotation drive unit (3) for rotationally driving the turntable so that the coating liquid level in the coating container forms a paraboloid of revolution;
A workpiece holding section (4) capable of holding a non-painted portion (92) of the workpiece and rotatable with the workpiece around a rotation axis (R2) parallel to the rotation axis (R1) of the turntable; ,
A second rotation drive unit (5) for rotating the workpiece holding unit;
A coating apparatus comprising:   The coating apparatus according to claim 1, further comprising an elevating drive unit (6) that moves the work holding unit relative to the paint container in a vertical direction.   The elevating drive unit can position the workpiece so that the coating portion of the workpiece is positioned below the edge of the coating liquid surface forming a rotating paraboloid while being separated from the coating material. The coating apparatus according to claim 2, wherein: An immersion step of immersing the painted portion (91) of the work (9) in the paint stored in the paint container (1);
A first rotation step of rotating the coating container so that the coating liquid surface forms a rotating paraboloid after the dipping step;
During the first rotation stage, a second rotation stage in which the work is rotated around a rotation axis parallel to the rotation axis of the paint container with at least a part of the coating portion of the work being separated from the paint. When,
The coating method characterized by including.   Between the first rotation phase and before the start of the second rotation phase, the coating portion of the workpiece is away from the coating material and forms a paraboloid of revolution, which is perpendicular to the edge of the coating liquid surface. The coating method according to claim 4, further comprising a positioning step of positioning the workpiece so as to be positioned below the workpiece.

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