JPH1099736A - Bell type coating device and coating method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform metallic coating with a coating material contg. a scaly constituent material without causing nonuniformity in a coating and with high transfer efficiency. SOLUTION: This coating device is provided with an almost hollow-conical bell cup 2 that is rotatably fitted to the front end side of a coater main body 1 and used for forming a coating material P which is supplied toward a disk-like coating material diffuser plate 4 placed at the base end 4 of the bell cup 2, into an atomized state by a centrifugal force and a shaping-air formation means 3 for jetting out shaping air Fs toward the outside in the radial direction of the bell cup 2. At this time, the device is further provided with an air curtain formation means for jetting out air curtains at intervals of 180 deg. so as to cross the stream of the shaping air Fs in the radial direction to arrange fine scales of the scaly constituent material in almost the same direction (i.e., direction parallel to the major axis of the elliptical cross-section of the stream of the shaping air Fs ) in the shaping air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bell-shaped coating apparatus suitable for coating a paint containing scale-like members and a coating method using the bell-shaped coating apparatus.

[0002]

2. Description of the Related Art As a method of coating an outer panel of an automobile or the like, there are a method using a reactor type coating apparatus and a method using a bell type coating apparatus. The bell type coating apparatus has a high coating efficiency, but scales. It has been said that it is not suitable for coating of a paint containing a shape member (hereinafter, referred to as metallic coating). However, there is a demand for utilizing the high coating efficiency of the bell-shaped coating apparatus in metallic coating, and therefore, a bell-shaped coating apparatus applicable to metallic coating is being developed.

As shown in FIG. 7, the bell-shaped coating apparatus is rotatably provided at the tip end of a coating machine main body 1 and is supplied toward a disk-shaped paint diffusion plate 4 provided at a base end thereof. A substantially conical cylindrical bell cup 2 that forms the sprayed paint P into an atomized state by centrifugal force, and shaping air Fs (that is, a substantially cylindrical air curtain) is jetted radially outward of the bell cup 2. The shaping air forming means 3 is provided, and the paint P atomized by the bell cup 2 is put on the shaping air Fs and carried to the coating surface for coating. Kaihei 8-9
No. 9052).

[0004] When a metallic coating is to be performed using a bell-type coating apparatus having such a configuration, the paint P
There is a problem that uneven coating may occur depending on the behavior of the flaky member F contained therein.

Therefore, as a method of eliminating the unevenness of the coating when the metallic coating is performed by using a bell type coating apparatus, as shown in FIGS. 8 (a) and 8 (b), the coating surface is placed on shaping air. Or a method in which the scale-like member F in the paint P that has reached the above-mentioned position is lowered so as to be parallel to the application surface, or a method in which the arrangement of the scale-like member F is randomly disturbed. For example, the shaping air forming means 3 in the bell type coating apparatus is modified to increase the air jetting pressure by applying work, or to apply a vortex disturbance, or to increase the speed of moving on the coating surface of the bell type coating apparatus. This has been realized by a method or the like that disturbs the pattern (that is, the arrangement of the scale-like members in the shaping air).

[0006]

However, according to the above-mentioned method, if the size of the scale-like member F contained in the coating material becomes large (for example, if it becomes larger than 30 × 30 μm and the thickness is about 1 μm), FIG. As shown, the shape of the scaly member F comes to follow the flow of the shaping air Fs in the shaping air Fs close to the laminar flow formed by the bell cup. This is similar to the form that a flat plate (having a specific gravity enough to float in water) is thrown into a laminar river at a speed relative to the flow velocity of the river.

In the above-described embodiment, the scaly member F
Of the scale-like member F when it reaches the coating surface becomes insufficient, and the scale-like member F is coated while standing on the coating surface. Therefore, when the bell-shaped coating apparatus moves on the coating surface in the direction of arrow A, the coating surface has a cluster of scaly members F having a maximum difference of 90 ° (for example,
This results in striped coating unevenness (as indicated by regions C and D).

In order to eliminate the above-mentioned uneven coating,
When the above-described method (for example, a method of disturbing a bell pattern) is used, the coating efficiency is significantly reduced,
The greatest advantage of the bell-type coating equipment will be lost.

[0009] The present invention has been made in view of the above points, and an object of the present invention is to make it possible to perform metallic coating with a paint containing a flaky member without coating unevenness and with high coating efficiency. is there.

[0010]

According to a first basic configuration of the present invention, as a means for solving the above-mentioned problems, a rotatable device is provided at a distal end side of a coating machine main body and provided at a base end portion thereof. A substantially conical cylindrical bell cup for forming the paint supplied toward the disc-shaped paint diffusion plate into a state of atomization by centrifugal force, and shaping air forming means for blowing the shaping air radially outward of the bell cup. The bell-shaped coating apparatus further includes air curtain forming means for jetting an air curtain which radially crosses the shaping air jetted from the shaping air forming means at 180 ° intervals.

[0011] With this configuration, the shaping air is divided into two by the air curtain, and has a substantially elliptical arc shape. Direction). Therefore, it is possible to perform metallic coating without coating unevenness by a simple structural change of providing an air curtain forming means.

In a second basic configuration of the present invention, as a means for solving the above-mentioned problems, a disk-shaped paint diffusion plate provided rotatably at the tip end of a coating machine main body and provided at the base end thereof is provided. Bell-shaped having a substantially conical cylindrical bell cup for forming the paint supplied toward the container into a state of atomization by centrifugal force, and shaping air forming means for ejecting shaping air radially outward of the bell cup. In the coating apparatus, the paint diffusion plate is moved toward the paint supply surface of the paint diffusion plate.
A pair of air ejection means for ejecting air at 0 ° intervals is additionally provided.

With this configuration, the paint to be supplied is divided into two symmetrical portions (ie, a pair of approximately 90 ° ranges) on the paint diffusion plate, and the paint to be applied to the shaping air only from those portions. The supply is performed, and the arrangement of the scale-like members in the shaping air is substantially the same direction (that is, the direction parallel to the symmetry axis of the paint supply portion). Therefore, it is possible to perform metallic coating without coating unevenness by a simple structural change of providing an air ejection means.

According to a third basic structure of the present invention, as a method for solving the above-mentioned problem, a disk-shaped paint diffusion plate is provided rotatably at a distal end side of a coating machine main body and provided at a base end thereof. Bell-shaped having a substantially conical cylindrical bell cup for forming the paint supplied toward the container into a state of atomization by centrifugal force, and shaping air forming means for ejecting shaping air radially outward of the bell cup. In applying the paint containing the scaly member using a coating device, the scaly member in the paint that reaches the application surface by riding on the shaping air is arranged in substantially the same direction to perform painting. .

According to the above-mentioned method, since the directions of the scale-like members in the paint reaching the coating surface on the shaping air are adjusted in substantially the same direction, it is possible to perform metallic coating without coating unevenness.

According to a fourth basic structure of the present invention, as a method for solving the above-mentioned problem, a disk-shaped paint diffusion plate provided rotatably at the tip end of a coating machine main body and provided at the base end thereof. Bell-shaped having a substantially conical cylindrical bell cup for forming the paint supplied toward the container into a state of atomization by centrifugal force, and shaping air forming means for ejecting shaping air radially outward of the bell cup. In applying the paint containing the scaly member using a coating apparatus, the shaping air is divided into two by an air curtain that traverses in the radial direction at 180 ° intervals, so that the shaping air rides on the shaping air to reach the coating surface. The scale-like members in the paint are oriented in substantially the same direction so that the paint is applied.

According to the above-mentioned method, the shaping air is divided into two by the air curtain, and has a substantially elliptical arc shape. Becomes Therefore, since the scale-like members in the paint that reach the coating surface on the shaping air are arranged in substantially the same direction, it is possible to perform metallic coating without coating unevenness.

In a fifth basic configuration of the present invention, as a method for solving the above-mentioned problem, a disk-shaped paint diffusion plate provided rotatably at the tip end of a coating machine main body and provided at the base end thereof is provided. Bell-shaped having a substantially conical cylindrical bell cup for forming the paint supplied toward the container into a state of atomization by centrifugal force, and shaping air forming means for ejecting shaping air radially outward of the bell cup. In applying the paint containing the scaly member using a coating apparatus, the paint supply to the paint diffusion plate is partially eliminated at a symmetrical position, so that the paint reaches the application surface on the shaping air. The scale-like members in the paint are oriented in substantially the same direction so that the paint is applied.

According to the above-described method, the supplied paint is applied to two symmetrical portions (that is, a pair of approximately 9
In this case, the paint is supplied to the shaping air only from this portion, and the arrangement of the scale-like members in the shaping air is almost the same direction (that is, parallel to the symmetry axis of the paint supply portion). Direction). Therefore, since the scale-like members in the paint that reach the coating surface on the shaping air are arranged in substantially the same direction, it is possible to perform metallic coating without coating unevenness.

In the fifth basic configuration of the present invention, air is jetted at 180 ° intervals toward the paint supply surface of the paint diffuser plate, so that the paint supply to the paint diffuser plate is partially symmetrical. If it is made to eliminate, the arrangement of the scale-like members in the shaping air is almost the same direction (that is, the direction parallel to the symmetry axis of the paint supply portion) by a simple method of blowing air to the paint diffusion plate. It is preferable because it can be performed.

In the third to fifth basic constitutions of the present invention, when the direction of the scale-like member is set to a direction substantially perpendicular to the moving direction of the bell-shaped coating device, a portion where the paint is not supplied partially occurs. This is preferable in that no unpainted portion is formed on the painted surface.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 to 4 show a bell-shaped coating apparatus according to a first embodiment of the present invention.

As shown in FIGS. 1 to 3, the bell type coating apparatus is provided with a coating machine main body 1 having an air motor (not shown) built therein and a rotatable tip end of the coating machine main body 1. The bell cup 2 and shaping air forming means 3 for ejecting shaping air Fs radially outward of the bell cup 2 are provided.

The bell cup 2 has a substantially conical cylindrical shape, and the paint P supplied toward the disc-shaped paint diffusion plate 4 provided at the base end thereof is atomized by centrifugal force. And is rotatably attached to the tip of a drive shaft 5 that is rotationally driven by an air motor. Reference numeral 6 denotes a paint outlet formed on the outer peripheral side of the paint diffusion plate 4.
The paint supplied to the inner surface side of the paint diffusing plate 4 and atomized by centrifugal force is diffused through the paint outlet 6 along the inner peripheral surface of the bell cup 2.

A paint supply pipe 7 fixed to the coating machine main body 1 side is inserted through the center of the drive shaft 5, and the tip of the paint supply pipe 7 is connected to the inner surface of the paint diffusion plate 4. A nozzle 8 for supplying paint is provided facing the side. The paint supply pipe 7 is configured not to rotate even when the drive shaft 5 is driven to rotate.

The shaping air forming means 3 is communicated with an air passage 9 formed in the coating machine main body 1, an air chamber 10 formed at a tip end of the air passage 9, and the air chamber 10. A large number of air outlets 1 formed at predetermined intervals in an annular shape at the tip end surface of the coating machine main body 1
1, 11,... In other words, the air spouted from these air spouts 11, 11,... Forms shaping air Fs having a substantially cylindrical shape outside the bell cup 2 in the radial direction.

According to the present embodiment, the shaping air Fs is set to 180
Air curtain forming means 12 for jetting the air curtain Fc that crosses in the radial direction at intervals of ° is provided.

The air curtain forming means 12 includes a second air passage 13 formed separately from the air passage 9 in the coating machine main body 1, and an air chamber 14 formed at a tip end of the air passage 13. And a pair of radially extending slit-shaped air jets 15, 15... Formed in the tip end surface of the coating machine main body 1 at 180 ° intervals symmetrically with each other while being communicated with the air chamber 14. It is configured. That is, the shaping air Fs is increased by 180 from the air jets from the air jets 15, 15,...
A pair of substantially flat air curtains Fc, Fc,... Traversing in the radial direction at intervals of ° are formed (see FIGS. 3 and 4). Then, the shaping air Fs is divided into two by the air curtains Fc, Fc,.

A case in which metallic coating is performed using the bell-shaped coating apparatus configured as described above will be described.

When performing the metallic coating, the paint P containing the flaky member F is supplied to the inside of the paint diffusion plate 4 through the paint supply pipe 7.

The paint P supplied to the inside of the paint diffusion plate 4 is diffused and atomized by the centrifugal force caused by the rotation of the bell cup 2 and is ejected from the paint ejection port 6. Is diffused in a substantially cylindrical shape along.

On the other hand, the shaping air Fs formed by the shaping air forming means 3 is, as described above,
It is divided into two by the air curtain Fc to form a substantially elliptical arc shape.

Accordingly, the scale-like members F in the paint P riding on the shaping air Fs toward the coating surface are arranged in substantially the same direction (that is, a direction parallel to the major axis of the ellipse) as shown in FIG. Becomes This phenomenon occurs regardless of the size of the scaly member F.

When the bell-shaped coating apparatus is moved in a direction perpendicular to the direction in which the scale members F are arranged (ie, in the direction of arrow X in FIG. 4), the scale members F are substantially in the same direction on the coating surface. And striped coating unevenness does not occur. Moreover, since there is no need to disturb the shaping air Fs, it is possible to maintain a high coating efficiency, which is an advantage of the bell type coating apparatus.

Second Embodiment FIGS. 5 and 6 show a bell-shaped coating apparatus according to a second embodiment of the present invention.

In this case, the air curtain forming means in the first embodiment is omitted. Instead, the bell curtain 2 faces the inner side of the paint diffusion plate 4 (ie, the paint supply surface) by 180 °. A pair of air jetting means 16, 16 for jetting air at intervals of ° are provided.

With this configuration, the portions of the paint diffusion plate 4 where the air ejected from the air ejection means 16 and 16 reach reach the regions Y and Y where the supplied paint P cannot diffuse. . Therefore, the paint P is divided into two symmetrical portions on the paint diffusion plate 4 (that is, the regions Y,
Therefore, the paint is supplied to the shaping air Fs only from the part Z, Z. Therefore, the arrangement of the scale-like members F in the shaping air Fs is substantially the same direction (that is, a direction substantially parallel to the symmetry axis O of the paint diffusion portion).

When the bell-shaped coating apparatus is moved in a direction perpendicular to the direction in which the flake-shaped members F are arranged (ie, in the direction of arrow X in FIG. 6), the flake-shaped members F are substantially in the same direction on the coating surface. And striped coating unevenness does not occur. Moreover, since there is no need to disturb the shaping air Fs, it is possible to maintain a high coating efficiency, which is an advantage of the bell type coating apparatus.

The other configuration, operation, and effect are the same as those in the first embodiment, and thus the description is omitted.

[0041]

According to the present invention, since the direction of the scale-like members in the paint that reaches the coating surface on the shaping air is adjusted to substantially the same direction, it is possible to perform metallic coating without coating unevenness. Thus, there is an excellent effect that good metallic coating can be performed while maintaining high coating efficiency, which is an advantage of the bell type coating apparatus.

Further, the addition of an air curtain forming means or an air jetting means can be made suitable for metallic coating, which is advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of a bell-shaped coating apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front view of a coating machine main body in the bell-shaped coating apparatus according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state in which shaping air is formed by the bell-shaped coating apparatus according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a main part of a bell-shaped coating apparatus according to a second embodiment of the present invention.

FIG. 6 is an explanatory view showing a state in which shaping air is formed by a bell-shaped coating apparatus according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a main part of a conventional bell type coating apparatus.

FIG. 8 (a) is an application surface in which scale members are laid down so as to be arranged in the same direction in metallic coating, and (b) is an application surface in which scale members are arranged randomly in metallic coating. FIG.

FIG. 9 is an explanatory diagram showing the behavior of a flaky member when performing metallic coating using a conventional bell-type coating apparatus.

[Explanation of symbols]

1 is a coating machine main body, 2 is a bell cup, 3 is a shaping air forming means, 4 is a paint diffusion plate, 12 is an air curtain forming means, 16 is an air jetting means, P is paint, F is a flaky member, and Fs is shaping. Air, Fc is air curtain, X
Is the moving direction.

Claims (7)

[Claims] 1. A substantially cone which is rotatably provided at a tip end side of a coating machine main body and which makes a paint supplied toward a disc-shaped paint diffusion plate provided at a base end thereof into an atomized state by centrifugal force. A bell-shaped coating apparatus comprising: a cylindrical bell cup; and shaping air forming means for blowing shaping air radially outward of the bell cup, wherein the shaping air blown from the shaping air forming means is provided. A bell-shaped coating apparatus, further comprising air curtain forming means for jetting an air curtain that crosses in the radial direction at 180 ° intervals. 2. A substantially cone which is rotatably provided at a tip end of a coating machine main body and which makes a paint supplied toward a disc-shaped paint diffusion plate provided at a base end thereof into an atomized state by centrifugal force. What is claimed is: 1. A bell type coating apparatus comprising: a cylindrical bell cup; and shaping air forming means for blowing shaping air radially outward of the bell cup. A bell-shaped coating apparatus, further comprising a pair of air jetting means for jetting air at an interval of °. 3. A substantially cone that is rotatably provided at the tip end of the coating machine main body, and that makes the paint supplied toward a disc-shaped paint diffusion plate provided at its base end into an atomized state by centrifugal force. In coating a paint containing a flaky member using a bell-shaped coating apparatus having a cylindrical bell cup and a shaping air forming means for blowing shaping air radially outward of the bell cup, A coating method using a bell-shaped coating apparatus, wherein the scale-like members in the coating material reaching the coating surface on the shaping air are arranged in substantially the same direction for coating. 4. A substantially cone which is rotatably provided at the tip end of the coating machine main body and which makes the paint supplied toward a disc-shaped paint diffusion plate provided at its base end into an atomized state by centrifugal force. In coating a paint containing a flaky member using a bell-shaped coating apparatus having a cylindrical bell cup and a shaping air forming means for blowing shaping air radially outward of the bell cup, The shaping air is divided into two parts by an air curtain that traverses in the radial direction at 180 ° intervals, so that the scale-like members in the paint that reach the coating surface on the shaping air are arranged in substantially the same direction for painting. A coating method using a bell-type coating apparatus, characterized by the following. 5. A substantially cone which is rotatably provided at the tip end of the coating machine main body and which makes the paint supplied toward a disc-shaped paint diffusion plate provided at its base end into an atomized state by centrifugal force. In coating a paint containing a flaky member using a bell-shaped coating apparatus having a cylindrical bell cup and a shaping air forming means for blowing shaping air radially outward of the bell cup, By partially eliminating the supply of the paint to the paint diffusion plate at a symmetrical position, the coating is performed in such a manner that the scale-like members in the paint that reach the coating surface on the shaping air are arranged in substantially the same direction. A coating method using a bell-type coating apparatus, characterized by the following. 6. The method according to claim 6, wherein the supply of paint to the paint diffusion plate is partially eliminated at symmetrical positions by blowing air at 180 ° intervals toward the paint supply surface of the paint diffusion plate. A coating method using the bell-shaped coating device according to claim 5, characterized in that: 7. The bell-shaped coating device according to claim 3, wherein the direction of the scale-like member is substantially perpendicular to the moving direction of the bell-shaped coating device. Painting method.