WO2018221608A1

WO2018221608A1 - Vehicle body coating method and vehicle body coating system

Info

Publication number: WO2018221608A1
Application number: PCT/JP2018/020806
Authority: WO
Inventors: 士郎山田; 浩軸屋; 邦治山内
Original assignee: Abb株式会社
Priority date: 2017-06-01
Filing date: 2018-05-30
Publication date: 2018-12-06
Also published as: JP6634532B2; JPWO2018221608A1

Abstract

The present invention comprises: a conveyance line (23) for conveying a vehicle body (11) including an inner surface and an outer surface; a left-side coating machine (1L) that is disposed on the left side in the width direction across the conveyance line (23); and a right-side coating machine (1R) that is disposed on the right side in the width direction across the conveyance line (23). The left-side coating machine (1L) and the right-side coating machine (1R) have the same structure for spraying a coating from a rotary atomizing head (6). The coating machines (1L, 1R) are configured such that the size of a coating pattern of the coating can be adjusted to a minimum pattern, a maximum pattern, and an intermediate pattern that is between the minimum pattern and the maximum pattern.

Description

Vehicle body painting method and vehicle body painting system

The present invention relates to a vehicle body coating method and a vehicle body coating system in which a vehicle body is painted using a rotary atomizing head type coating machine.

Generally, when painting the body of a vehicle, a rotary atomizing head type coating machine with good paint application efficiency and finish is used. This coating machine passes through the rotary shaft for supplying paint, an air motor that uses compressed air as a power source, a hollow rotary shaft that is rotatably supported by the air motor and has a tip protruding forward from the air motor. A feed tube extending to the tip of the rotating shaft, an outer peripheral surface attached to the tip of the rotating shaft and expanding in a cup shape, an inner peripheral surface diffusing paint supplied from the feed tube, and the tip. And a rotary atomizing head having a discharge edge for discharging paint.

In addition, a shaping air ring is provided on the outer periphery of the rotary atomizing head so that the tip is located behind the discharge edge of the rotary atomizing head. The shaping air ring is disposed so as to surround the rotary atomizing head, and a plurality of first shaping air ejection holes for ejecting the first shaping air toward the periphery of the discharge edge, A large number of nozzles that are positioned radially inward of the first shaping air ejection hole, surround the rotary atomizing head, and eject second shaping air along the outer peripheral surface of the rotary atomizing head. The second shaping air ejection hole.

The coating machine configured as described above controls the flow rate of the shaping air ejected from the first shaping air ejection hole and the second shaping air ejection hole. Thereby, the structure which adjusts the magnitude | size of the coating pattern of the coating material sprayed from the rotary atomization head of a coating machine with shaping air is known (patent document 1).

JP 2004-305874 A

When painting the body of a vehicle, the paint is sprayed to a position off the edge of the painted surface so that a uniform coating film is formed up to the edge of the painted surface. In this case, the coating machine adjusts the size of the paint pattern according to the size of the paint surface in order to reduce the amount of paint that is removed from the paint surface and to be discarded, and to perform high-quality and efficient painting. There is a need to.

For example, when painting the large outer surface of the engine hood, roof, door, etc. that make up the body, painting is done efficiently by using a large paint pattern. On the other hand, when painting the elongated inner surface of a pillar, radiator support, or the like, painting is performed using a small coating pattern so that the sprayed paint does not protrude from the painted surface due to an excessively large coating pattern. However, the coating pattern need not be adjusted only in size, and it is necessary to obtain a good coating film by spraying the paint uniformly on the painted surface. Accordingly, it is difficult to stably adjust the coating pattern of paint sprayed from one type of coating machine having the same structure from a small coating pattern to a large coating pattern.

Therefore, when painting the body of a vehicle, it is suitable for painting a small pattern coating machine that can spray paint with a small painting pattern suitable for painting the inner surface of the body and the outer surface of the body. A large pattern coating machine capable of spraying paint with a large coating pattern is provided. In the body inner surface painting booth, painting is performed by providing a plurality of painting robots equipped with small pattern coating machines. In the body exterior painting booth, painting will be performed by installing multiple painting robots equipped with large pattern coating machines.

In this case, a large space is required to install two painting booths. In addition, when two painting booths are installed, many painting robots and painting machines are required, as well as equipment such as paint supply equipment, air conditioning equipment for preparing the environment inside the paint booth, and waste paint collection equipment However, it will be necessary for each painting booth. Furthermore, since the parts used are different between the small pattern coater and the large pattern coater, a large number of spare parts must be secured.

On the other hand, the painting booth has painting machines (painting robots) on both the left and right sides of the vehicle body. The painting machine on the left paints the left side of the body, and the painting machine on the right paints the right side of the body. It has a configuration. In this painting booth, it is necessary to alternately perform painting by the left painting machine and painting by the right painting machine so that the left painting machine and the right painting machine do not interfere with each other. For this reason, at the time of a painting operation, since either the left or the right coating machine is in a standby state, there is a problem that the operation rate of the painting operation is lowered.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to allow a coating pattern to be adjusted over a wide range from a small pattern to a large pattern using a coating machine having the same structure. It is an object of the present invention to provide a method for painting a vehicle body and a painting system for a vehicle body that can coat both the inner and outer surfaces of the vehicle body.

A vehicle body painting method according to the present invention includes a conveyance line for conveying a vehicle body having an inner surface and an outer surface, a one-side coating machine arranged on one side in a width direction across the conveyance line, and the conveyance An other-side coating machine disposed on the other side in the width direction across the line, the one-side coating machine and the other-side coating machine having the same structure for spraying paint from a rotary atomizing head The coating pattern of the paint is configured to be adjustable to a minimum pattern, a maximum pattern, and an intermediate pattern that is intermediate between the minimum pattern and the maximum pattern. The inner surface on one side of the body is painted using the minimum pattern or the intermediate pattern, and the other-side coating machine is configured such that the one-side coating machine paints the inner surface on one side of the body. In parallel, the maximum power Or the intermediate pattern is used to paint the outer surface on the other side of the body, and the other side coating machine is used to coat the inner surface on the other side of the body using the minimum pattern or the intermediate pattern. The one-side coating machine uses the maximum pattern or the intermediate pattern in parallel with the other-side coating machine coating the inner surface of the other side of the body. It is characterized by painting the outer surface.

A vehicle body coating system according to the present invention includes a transport line for transporting a vehicle body having an inner surface and an outer surface, and a one-side coating machine disposed on one side in the width direction across the transport line; The other side coating machine disposed on the other side in the width direction across the transport line, and the one side coating machine and the other side coating machine have the same structure for spraying the paint from the rotary atomizing head A coating machine, wherein the coating pattern size of the paint is configured to be adjustable to a minimum pattern, a maximum pattern, and an intermediate pattern that is intermediate between the minimum pattern and the maximum pattern, and the one-side coating The machine coats the inner surface on one side of the body using the minimum pattern or the intermediate pattern, and the other-side coating machine coats the inner surface on one side of the body with the one-side coating machine. In parallel with The outer surface of the other side of the body is painted using the maximum pattern or the intermediate pattern, and the other side coating machine applies the inner surface of the other side of the body using the minimum pattern or the intermediate pattern. Painting, the one side painting machine using the maximum pattern or the intermediate pattern in parallel with the other side painting machine painting the inner surface of the other side of the body; The outer surface is painted.

According to the present invention, it is possible to adjust a coating pattern in a wide range from a small pattern to a large pattern using a single type of coating machine having the same structure, and with this coating machine, both the inner surface and the outer surface of the vehicle body Can be painted.

It is a longitudinal cross-sectional view which shows the rotary atomizing head type coating machine which concerns on embodiment of this invention. It is a front view which expands and shows the rotation atomization head and the front side part of the shaping air ring. FIG. 3 is a lateral view of the rotary atomizing head type coating machine in which the rotary atomizing head is omitted as viewed from the direction of arrows III-III in FIG. 1. FIG. 4 is a longitudinal sectional view of a first shaping air ejection hole of the shaping air ring as viewed from the direction of arrows IV-IV in FIG. 3. FIG. 5 is a longitudinal sectional view of a second shaping air ejection hole of the shaping air ring as viewed from the direction of arrows VV in FIG. 3. It is explanatory drawing which shows an example of the various conditions for adjusting the coating pattern of a rotary atomizing head type coating machine. It is a top view which shows the coating system of the vehicle body which concerns on embodiment of this invention. It is a front view which expands and shows the body by which painting is performed by the painting system of a vehicle body. It is a time chart which shows a part of flow of the painting work by the left side painting machine and the right side painting machine. It is a longitudinal cross-sectional view which shows the indirect charging type rotary atomizing head type coating machine which concerns on the modification of this invention.

Hereinafter, a vehicle body coating system according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 9. In this embodiment, for example, a case where a coating system including a rotary atomizing head type coating machine capable of adjusting a painting pattern to a minimum pattern, a maximum pattern, and an intermediate pattern is applied to a painting booth of a vehicle body is illustrated. ing. The painting includes base painting, clear painting, and intermediate painting. In this embodiment, the case of performing clear painting as finish painting will be described.

First, the configuration of the rotary atomizing head type coater will be described. In this coating machine, there are an electrostatic coating machine that applies a high voltage to a sprayed paint and a non-electrostatic coating machine that performs a coating without applying a high voltage to the paint. In the embodiment described below, a rotary atomizing head type coating machine configured as a direct charging type electrostatic coating machine that directly applies a high voltage to a coating material will be described as an example.

In FIG. 1, a rotary atomizing head type coating machine 1 constitutes one type of coating machine having the same structure that is commonly used in a coating booth 22 described later (hereinafter referred to as a rotary atomizing head type). The painting machine 1 is called “painting machine 1”). Further, in the painting machine 1, the painting machine 1 L constituting the one-side painting machine is arranged on the left side of the vehicle booth 22 with the vehicle body 11 interposed therebetween. On the other hand, as for the coating machine 1, what is arrange | positioned at the right side becomes the coating machine 1R which comprises the other side coating machine. The coating machine 1 is configured as a direct charging type electrostatic coating machine that directly applies a high voltage to a paint by a high voltage generator (not shown). As shown in FIG. 7, the coating machine 1 is attached to the tips of the arms 24A of a plurality of, for example, eight coating robots 24 described later.

The coating machine 1 includes a housing 2, an air motor 3, a rotating shaft 4, a feed tube 5, a rotary atomizing head 6, and a shaping air ring 7 which will be described later.

The housing 2 includes a housing main body 2A formed in a disc shape located on the rear side, and a cylindrical cover cylinder 2B extending from the outer peripheral side of the housing main body 2A toward the front side. The housing body 2A is attached to the tip of the arm 24A of the painting robot 24 described above via a robot connection holder (not shown). On the other hand, an air motor 3 to be described later is attached to the front side of the housing main body 2A so as to be positioned in the cover tube 2B. Further, a base end side of a feed tube 5 described later is fixedly attached to the axial center position of the housing main body 2A (axis line OO of the rotary shaft 4 described later).

The air motor 3 is provided in the housing 2 coaxially with the housing 2 (on the axis OO). The air motor 3 rotates the rotary shaft 4 and the rotary atomizing head 6 at a high speed of 3 to 150 krpm, for example, using compressed air as a power source. The air motor 3 includes a stepped cylindrical motor case 3A attached to the front side of the housing body 2A, a turbine 3B rotatably accommodated at a rear position of the motor case 3A, and a rotating shaft 4 provided in the motor case 3A. And an air bearing 3C that rotatably supports the motor.

Here, turbine air is supplied to the turbine 3B from a turbine air source 27 described later. The rotational speed of the turbine 3B, that is, the rotational speed of the rotary atomizing head 6 is controlled in accordance with the flow rate of the turbine air.

The rotary shaft 4 is formed as a cylindrical body that is rotatably supported by the air motor 3 via an air bearing 3C. The rotating shaft 4 is disposed in the motor case 3A so as to extend in the axial direction about the axis OO. The rotating shaft 4 has a base end side (rear end side) integrally attached to the center of the turbine 3B, and a tip projecting forward from the motor case 3A. A rotary atomizing head 6 is attached to the tip of the rotary shaft 4.

The feed tube 5 extends through the rotary shaft 4 to the tip of the rotary shaft 4. The distal end side of the feed tube 5 protrudes from the distal end of the rotary shaft 4 and extends into the rotary atomizing head 6. The proximal end side of the feed tube 5 is fixedly attached to the center position of the housing body 2 A of the housing 2. The feed tube 5 has an internal paint flow path connected to a paint supply source 28 described later including a color change valve device.

The feed tube 5 supplies the paint from the paint channel toward the rotary atomizing head 6 when performing the painting operation. On the other hand, when performing the cleaning operation of the adhering paint, a cleaning fluid such as thinner or air can be supplied from the paint channel toward the rotary atomizing head 6. The feed tube 5 may be formed as a double pipe arranged coaxially, with a central flow path as a paint flow path and an outer annular flow path as a cleaning fluid flow path.

The rotary atomizing head 6 is attached to the tip of the rotary shaft 4 and is formed in a cup shape whose diameter increases from the rear side toward the front side. The rotary atomizing head 6 sprays the paint supplied from the feed tube 5 by being rotated at a high speed together with the rotary shaft 4 by the air motor 3. The proximal end side of the rotary atomizing head 6 is attached to the distal end portion of the rotary shaft 4 as a cylindrical attachment portion 6A. Here, as an example, a rotary atomizing head 6 having a diameter of 40 mm at a discharge edge 6D described later is used. In addition to this, for example, a rotary atomizing head having a diameter smaller than 30 mm and a rotary atomizing head having a large diameter exceeding 50 mm may be used.

On the front side of the mounting portion 6A of the rotary atomizing head 6, an outer peripheral surface 6B that expands in a cup shape toward the front side and a paint supplied from the feed tube 5 by widening in a funnel shape toward the front side are thin films. And an inner peripheral surface 6C that forms a coating thin film surface that diffuses while being formed. The tip position of the inner peripheral surface 6C is a discharge edge 6D that discharges paint in a tangential direction when rotating.

On the other hand, a disc-shaped hub member 6E is provided on the inner side of the rotary atomizing head 6 so as to be located in the inner circumferential surface 6C. The hub member 6E smoothly guides the paint supplied from the feed tube 5 to the inner peripheral surface 6C. Further, the rotary atomizing head 6 is provided with an annular partition wall 6F by reducing the diameter of the position separated to the rear side of the hub member 6E. The annular partition wall 6F surrounds the tip of the feed tube 5 with a slight gap to form a paint reservoir 6G.

The rotary atomizing head 6 formed in this way is supplied with paint from the feed tube 5 while being rotated at high speed by the air motor 3. As a result, the rotary atomizing head 6 sprays the paint as innumerable paint particles atomized by centrifugal force from the discharge edge 6D through the paint reservoir 6G, the hub member 6E, and the inner peripheral surface 6C (coating thin film surface). To do.

Next, the configuration of the shaping air ring 7 which is a characteristic part of the present invention will be described.

The shaping air ring 7 is provided on the front side of the housing 2 in the axial direction. The shaping air ring 7 has an axial tip positioned behind the discharge end edge 6D of the rotary atomizing head 6 by a fixed length, and a space around the outer peripheral surface 6B of the rotary atomizing head 6 with a gap. It is placed around. The shaping air ring 7 ejects shaping air from a first shaping air ejection hole 9 and a second shaping air ejection hole 10 described later. Thereby, the shaping air ring 7 can arrange the coating pattern of the paint into a desired size and shape while atomizing the paint sprayed from the discharge edge 6D of the rotary atomizing head 6.

The shaping air ring 7 includes a ring main body 8, a first shaping air ejection hole 9, and a second shaping air ejection hole 10 which will be described later.

The ring body 8 is formed as a stepped cylinder surrounding the rotary atomizing head 6. The rear side of the ring body 8 is attached to the cover cylinder 2 B of the housing 2. Thereby, the ring main body 8 fixes the air motor 3 in the cover cylinder 2B. On the other hand, the outer peripheral side of the ring body 8 is tapered in a tapered shape toward the front side. Furthermore, a first shaping air ejection hole 9 and a second shaping air ejection hole 10 are provided in the distal end surface 8A of the ring body 8 so as to open.

The first shaping air ejection hole 9 is disposed so as to surround the rotary atomizing head 6. That is, a large number of first shaping air ejection holes 9 are provided continuously in the circumferential direction in a state where the first shaping air ejection holes 9 are opened in the front end surface 8A of the shaping air ring 7. Each first shaping air ejection hole 9 is connected to a later-described first shaping air source 29 (referred to as a first SA source 29 for short) via a first air supply path 9A. The first shaping air ejection hole 9 is formed as a small-diameter round hole. The first shaping air ejection hole 9 acts in the direction in which the paint particles sprayed from the rotary atomizing head 6 are spread (in the direction in which the coating pattern is enlarged).

Here, a large number of first shaping air ejection holes 9 are provided in the circumferential direction surrounding the entire circumference of the rotary atomizing head 6. The number N1 of first shaping air ejection holes 9 is set to be larger than the number N2 of second shaping air ejection holes 10 described later. That is, the number N1 of the first shaping air ejection holes 9 is set as the following formula 1 when the diameter dimension at the discharge end edge 6D of the rotary atomizing head 6 is 40 mm.

In this case, as shown in FIG. 3, the distance between adjacent first shaping air ejection holes 9 is the dimension W1. The interval dimension W1 is set as shown in the following formula 2.

Further, as shown in FIG. 4, the inner diameter dimension d1 of the first shaping air ejection hole 9 is set to be larger than the inner diameter dimension d2 of the second shaping air ejection hole 10 described later. That is, the inner diameter dimension d1 of the opening end of the first shaping air ejection hole 9 is set as shown in Equation 3 below.

On the other hand, the axis O1-O1 of the first shaping air ejection hole 9 is inclined with respect to the axis OO of the rotary shaft 4 at an angle α1 in the direction opposite to the rotational direction of the rotary atomizing head 6. The inclination angle α1 is set as in the following equation 4.

Further, the first shaping air ejection hole 9 blows the first shaping air toward the paint particles immediately after being discharged from the discharge edge 6D of the rotary atomizing head 6. Therefore, as shown in FIG. 2, the first shaping air ejection hole 9 is provided at a position separated from the discharge end edge 6D in the radial direction by a distance dimension L1. In this case, the distance dimension L1 is set as shown in Equation 5 below.

The first shaping air ejection hole 9 is substantially parallel to the axis OO in the radial direction of the rotating shaft 4 (shaping air ring 7) (as viewed from the direction shown in FIG. 2). . A large number of first shaping air ejection holes 9 formed under the above-described conditions are the first from the front to the liquid yarn of the paint flying in the tangential direction from the discharge end edge 6D of the rotary atomizing head 6. Make the shaping air collide. Thereby, the first shaping air ejection hole 9 can positively atomize the sprayed paint. Moreover, the first shaping air ejection hole 9 can adjust the size of the coating pattern in cooperation with the second shaping air described later by adjusting the flow rate (flow velocity) of the first shaping air. it can.

The second shaping air ejection holes 10 are disposed radially inside the first shaping air ejection holes 9 so as to surround the rotary atomizing head 6. The second shaping air ejection hole 10 ejects the second shaping air along the outer peripheral surface 6 B of the rotary atomizing head 6. The second shaping air ejection hole 10 is composed of a small-diameter round hole substantially in the same manner as the first shaping air ejection hole 9, and is opened in the front end surface 8 A of the ring body 8 constituting the shaping air ring 7. One is provided. The second shaping air ejection hole 10 is connected to a later-described second shaping air source 30 (abbreviated as the second SA source 30) through a second air supply path 10A. The second shaping air ejection hole 10 acts in the direction of narrowing the paint particles sprayed from the rotary atomizing head 6 (the direction of reducing the coating pattern).

Here, a plurality of second shaping air ejection holes 10 are provided between the rotary atomizing head 6 and the first shaping air ejection hole 9 so as to surround the entire circumference in the circumferential direction. The number of second shaping air ejection holes 10 is set to be smaller than the number of first shaping air ejection holes 9. That is, the number N2 of the second shaping air ejection holes 10 is set as the following formula 6 when the diameter dimension at the discharge end edge 6D of the rotary atomizing head 6 is 40 mm.

Here, the number N2 of the second shaping air ejection holes 10 has a relationship of the following Expression 7 with respect to the number N1 of the first shaping air ejection holes 9.

In this case, as shown in FIG. 3, the interval between adjacent second shaping air ejection holes 10 is the dimension W2. The spacing dimension W2 is set to a value larger than the spacing dimension W1 of the first shaping air ejection hole 9, that is, a range of the following formula 8.

Further, as shown in FIG. 5, the inner diameter dimension d2 of the opening end of the second shaping air ejection hole 10 is set as shown in the following equation (9).

Thus, the number N1 of the first shaping air ejection holes 9 is larger than the number N2 of the second shaping air ejection holes 10. The inner diameter dimension d1 of the opening end of the first shaping air ejection hole 9 is set to a value larger than the inner diameter dimension d2 of the opening end of the second shaping air ejection hole 10. Therefore, the flow rate of the first shaping air ejected from the first shaping air ejection hole 9 can be lowered without changing the air supply amount. Thereby, the problem of the double pattern which has occurred when the flow velocity of the first shaping air is high can be solved. In addition, the diameter of the coating pattern can be reduced while maintaining a good coating state.

On the other hand, the number N2 of the second shaping air ejection holes 10 is smaller than the number N1 of the first shaping air ejection holes 9. The inner diameter dimension d2 of the opening end of the second shaping air ejection hole 10 is set smaller than the inner diameter dimension d1 of the opening end of the first shaping air ejection hole 9. Therefore, when the supply amount of air is the same, the flow speed of the second shaping air ejected from each second shaping air ejection hole 10 can be increased. Thereby, the 2nd shaping air can enlarge a painting pattern, maintaining a favorable painting state by cooperation with 1st shaping air.

On the other hand, the axis O2-O2 of the second shaping air ejection hole 10 is inclined with respect to the axis OO of the rotary shaft 4 at an angle α2 in the direction opposite to the rotational direction of the rotary atomizing head 6. The inclination angle α2 is set to a value smaller than the inclination angle α1 of the first shaping air ejection hole 9, that is, the following formula 10.

Furthermore, each second shaping air ejection hole 10 ejects the second shaping air along the outer peripheral surface 6B of the rotary atomizing head 6. Therefore, as shown in FIG. 2, the second shaping air ejection hole 10 is located at a position separated from the discharge end edge 6D in the radial direction by a distance dimension L2 (position overlapping the rotary atomizing head 6 when viewed from the front). ). In this case, the distance dimension L2 is set as in the following formula 11.

As shown in FIG. 2, the second shaping air ejection hole 10 is substantially parallel to the axis OO in the radial direction of the rotating shaft 4 (shaping air ring 7). Then, the second shaping air ejection hole 10 is configured such that the discharged second shaping air has an angle β with respect to the outer peripheral surface 6B of the rotary atomizing head 6 (an incident angle of the second shaping air with respect to the outer peripheral surface 6B). set to collide at β). The incident angle β of the second shaping air is set as shown in Equation 12 below.

In this case, when the incident angle β of the second shaping air increases, the second shaping air collides with the outer peripheral surface 6B of the rotary atomizing head 6 and scatters. On the other hand, when the incident angle β of the second shaping air becomes small, the second shaping air directly collides with the paint particles sprayed from the rotary atomizing head 6 and the shape of the coating pattern becomes unstable. On the other hand, by setting the incident angle β of the second shaping air within the above-described value range, the second shaping air can be stabilized and a good coating pattern can be obtained.

The second shaping air ejection hole 10 formed under the conditions as described above causes the second shaping air to collide with the liquid yarn of the paint separated from the discharge end edge 6D of the rotary atomizing head 6. Thereby, the 2nd shaping air ejection hole 10 can suppress the useless spreading | diffusion of a coating particle, and can stabilize a coating pattern. Moreover, the second shaping air ejection hole 10 can adjust the size of the coating pattern in cooperation with the first shaping air by adjusting the flow rate (flow velocity) of the second shaping air.

Here, as an example of a method for adjusting the size of the coating pattern by the coating machine 1, conditions for switching the coating pattern when the inner surface and the outer surface of the vehicle body 11 are painted as objects to be painted will be described.

As shown in FIG. 6, the size (pattern width) of the coating pattern can be switched between 50 to 100 mm, 200 to 300 mm, 300 to 400 mm, and 400 to 500 mm. In this case, the numerical conditions of the flow rate of the first shaping air (first SA flow rate), the flow rate of the second shaping air (second SA flow rate), the discharge amount of the paint, and the rotation speed of the rotary atomizing head 6 are as follows: Each is controlled to the value shown in FIG. In FIG. 6, the minimum pattern to be described later is a numerical condition with a pattern width of 50 to 100 mm, the maximum pattern is a numerical condition with a pattern width of 400 to 500 mm, and the intermediate pattern has a pattern width of 200 to 200 mm. Numerical conditions at 400 mm. For the intermediate pattern, numerical conditions are described separately for the narrow intermediate pattern (200 to 300 mm) and the large intermediate pattern (300 to 400 mm).

Specifically, when the inner surface is painted with a minimum pattern, the flow rate ratio between the first shaping air and the second shaping air is 50 to 200/600 NL (normal liters), and the discharge amount of the paint is 100. The rotational speed of the rotary atomizing head is 20 to 35 krpm. On the other hand, when the outer surface is painted with the maximum pattern, the flow rate ratio between the first shaping air and the second shaping air is 300/50 to 200 NL, the paint discharge rate is 300 to 500 cc / min, and the rotating fog The rotation speed of the chemical head is 25 to 55 krpm. Further, when the inner and outer surfaces are painted with an intermediate pattern, the flow rate ratio between the first shaping air and the second shaping air, the discharge amount of the paint, and the rotary atomizing head, as with the minimum and maximum patterns. The rotation speed is set to an appropriate numerical condition.

The dimensions of the above-mentioned coating pattern are those for finishing coating (clear coating). For example, when undercoating (primer coating) is applied, each dimension is set to be about 100 mm larger.

The coating pattern of the coating machine 1 used in the present embodiment consists of three types: a minimum pattern, an intermediate pattern, and a maximum pattern. Here, the minimum pattern is a range of 1.0 to 2.5 times the diameter of the rotary atomizing head 6. When the diameter of the rotary atomizing head 6 is 40 mm, the pattern width is 50 to 100 mm. The maximum pattern is a range of 10 to 12 times the diameter of the rotary atomizing head 6. When the diameter of the rotary atomizing head 6 is 40 mm, the pattern width is 400 to 500 mm. Further, the intermediate pattern has a pattern width of 200 to 400 mm between the minimum pattern and the maximum pattern. This intermediate pattern is divided into a narrow intermediate pattern having a pattern width of 200 to 300 mm and a large intermediate pattern having a pattern width of 300 to 400 mm. Therefore, the coating machine 1 can adjust the size of the coating pattern to three types while maintaining a good spray state. As a result, one type of coating machine 1 can be used for both inner surface coating and outer surface coating of a vehicle body 11 described later.

When finishing coating is performed using the coating machine 1 according to the present embodiment, in order to obtain a desired coating pattern and a desired film thickness, the flow rate of the shaping air, the flow rate of the coating material, and the rotational speed of the rotary atomizing head 6 are obtained. Is controlled. As an example, in the minimum pattern (50 to 100 mm), the flow rate of the second shaping air is increased more than the flow rate of the first shaping air, the flow rate of the paint is decreased, and the rotational speed of the rotary atomizing head 6 is reduced. It is formed by lowering. In the maximum pattern (400 to 500 mm), the flow rate of the second shaping air is made smaller than the flow rate of the first shaping air, the flow rate of the paint is increased, and the rotational speed of the rotary atomizing head 6 is increased. Formed by. Further, in the intermediate pattern (200 to 400 mm), the flow rate of the first shaping air, the flow rate of the second shaping air, the flow rate of the paint, and the rotation speed of the rotary atomizing head 6 are intermediate values of the above-described values. Is set. The minimum pattern may be formed by increasing the rotational speed of the rotary atomizing head 6, and the maximum pattern may be formed by decreasing the rotational speed of the rotary atomizing head 6.

Next, the case where the coating machine 1 is applied to a vehicle body coating system 21 that paints the vehicle body 11 will be described.

First, as shown in FIGS. 7 and 8, a vehicle body 11 to be painted (object to be coated) will be described. The body 11 includes a body main body 12 having a structure elongated in the front and rear directions, a total of four doors 13 that can be opened and closed on both the left and right sides of the body main body 12, and the front side of the body main body 12. An engine hood 14 that can be opened and closed, a back door 15 that can be opened and closed on the rear side of the body body 12, a front bumper 16 that is provided at the front end of the body body 12, and a rear end portion of the body body 12 And a rear bumper 17 provided.

The body body 12 includes a left front fender 12A, a right front fender 12B, a left rear fender 12C, a right rear fender 12D, a roof 12E, a left front pillar 12F, a right front pillar 12G, a left rear pillar 12H, and a right rear pillar 12J. These left front fender 12A, right front fender 12B, left rear fender 12C, right rear fender 12D, roof 12E, left front pillar 12F, right front pillar 12G, left rear pillar 12H, and right rear pillar 12J each have an inner surface and an outer surface. Yes. Here, the left front pillar 12F, the right front pillar 12G, the left rear pillar 12H, and the right rear pillar 12J constitute a narrow portion of the outer surface of the body 11.

Further, a radiator support 12K is provided on the front side of the body body 12 so as to extend leftward and rightward between the front part of the left front fender 12A and the front part of the right front fender 12B. The radiator support 12K supports a radiator such as a radiator (not shown) and constitutes a part of the inner surface (inner plate) of the body main body 12.

Each of the four doors 13 has a window frame 13A between the body 12 and the roof 12E. This window frame 13A constitutes a narrow portion of the outer surface of the body 11 together with the

pillars

12F, 12G, 12H, and 12J of the body main body 12. The inside of the window frame 13A is a non-painting space 13B that is out of the window frame 13A to be painted. Here, a door knob 13 C having the same color as that of the body 11 is attached to each door 13. The door knob 13C constitutes a small component, and is disposed in the non-painting space 13B in the rear door 13 via a knob jig 18 as a jig.

The knob jig 18 has, for example, a fixing portion 18A that can be inserted into a groove on the attachment target side. The fixed portion 18A is attached to a position where no trouble occurs when the door 13 is painted, for example, in a glass movement groove (not shown) located below the window frame 13A in the door 13. Thereby, each door knob 13C can be painted together with the door 13 as a part of the operation | work when painting the door 13. As shown in FIG. The knob jig 18 may be attached to the door 13 using a fastening member or the like.

The front bumper 16 is attached to the front end portion of the body main body 12. The front bumper 16 is attached to the front portion of the body body 12 using a front bumper jig 19 as a jig. First, in the completed body 11 of the vehicle, the front bumper 16 is attached to the body main body 12 with no gap between the edge portion and the body main body 12. On the other hand, the front bumper jig 19 is a jig for forming a gap between the body main body 12 and the front bumper 16 so that the edge (end surface) of the front bumper 16 can be painted. . At this time, the gap dimension between the edge of the front bumper 16 and the body main body 12 by the front bumper jig 19 is set to 10 mm to 30 mm toward the front side.

The rear bumper 17 is attached to the rear end portion of the body main body 12. On the other hand, during the painting operation, the rear bumper 17 is attached to the rear portion of the body body 12 using a rear bumper jig 20 as a jig. Similar to the front bumper jig 19, the rear bumper jig 20 forms a gap between the body body 12 and the rear bumper 17 so that the edge (end surface) of the rear bumper 17 can be painted. It is a jig. At this time, the gap between the edge of the rear bumper 17 and the body body 12 by the rear bumper jig 20 is set to 10 mm to 30 mm toward the rear side.

Therefore, a gap can be formed between the body body 12 and the front bumper 16 by using the front bumper jig 19. Thereby, at the time of a painting operation | work, it can coat from the end surface of the front bumper 16 to the inner surface side through the said clearance gap. In addition, since the front bumper 16 can be painted with the same paint as the body main body 12 and the engine hood 14, the same hue as the surrounding body main body 12 and engine hood 14 can be obtained.

Similarly, the rear bumper jig 20 can form a gap between the body body 12 and the rear bumper 17. Thereby, at the time of a painting operation | work, it can coat from the end surface of the rear bumper 17 to the inner surface side through the said clearance gap. Moreover, the rear bumper 17 can also have the same hue as the surrounding body body 12 and back door 15.

Next, a vehicle body coating system 21 for coating the vehicle body 11 described above will be described with reference to FIG.

The painting system 21 includes a painting booth 22 that forms a long painting space, a conveyance line 23 extending along the painting booth 22, and a plurality of units disposed on both sides of the conveyance line 23, for example, a total of eight. The painting robot 24 includes a painting machine 24 and a painting machine 1 (1L, 1R) attached to the tip of an arm 24A of each painting robot 24. Here, each painting robot 24 can use a robot having the same structure.

The painting booth 22 includes a long rectangular parallelepiped building 22A extending along the transfer line 23, an air conditioner for preparing the environment in the building 22A, and a waste paint recovery device (none of which are shown). Has been. This one coating booth 22 is provided with an inner surface outer surface simultaneous coating area 25 located on the upstream side in the conveying direction of the body 11 and an outer surface coating area 26 located on the downstream side in the conveying direction of the body 11.

The conveyance line 23 conveys the body 11 within the building 22 A of the painting booth 22. The conveyance line 23 is configured by, for example, a rail 23A that extends straight in the center in the left and right directions of the building 22A, and a pedestal 23B (see FIG. 8) on which the body 11 is mounted and moved along the rail 23A. Yes.

Of the eight painting robots 24, six painting robots 24 located in the inner surface / outer surface simultaneous painting area 25 upstream of the transfer line 23 are used to paint both the inner surface and the outer surface of the body 11. It is done. Further, the two painting robots 24 located in the outer surface painting area 26 on the downstream side of the transfer line 23 are used for painting only the outer surface side of the body 11.

The painting machine 1 is attached to the tip of the arm 24A of each of the eight painting robots 24. That is, the assembly of the eight coating robots 24 and the coating machine 1 is common to all the units. Here, the coating machine 1 can coat both the inner surface side and the outer surface side of the body 11 as described above. Therefore, for example, if one painting robot 24 or painting machine 1 fails and can no longer be used, the remaining seven assemblies with low availability will be used instead of the unusable ones. can do. As a result, standby of the spare assembly can be made unnecessary.

The painting machine 1 is a painting machine 1L as a one-side painting machine that is attached to each painting robot 24 arranged on the left side in the width direction across the conveyance line 23. On the other hand, in the painting machine 1, what is attached to each painting robot 24 arranged on the right side is a painting machine 1R as the other-side painting machine.

The operation when the body 11 is painted by the vehicle body painting system 21 according to the present embodiment will be described.

First, the operation of spraying paint with the coating machine 1 will be described. Compressed air is supplied from the turbine air source 27 to the turbine 3B of the air motor 3, and the rotary shaft 4 and the rotary atomizing head 6 are rotated at high speed by the air motor 3. In this state, the paint selected by the color changing valve device of the paint supply source 28 is supplied from the paint flow path of the feed tube 5 to the rotary atomizing head 6. Thereby, the rotary atomizing head 6 sprays the supplied paint as paint particles.

In this case, the rotary atomizing head 6 is applied to a high voltage via the housing 2, the rotary shaft 4 and the like. Thereby, the paint particles sprayed from the rotary atomizing head 6 can be in a state of being charged to a high voltage. Paint particles sprayed from the rotary atomizing head 6, that is, charged paint particles, fly toward the body 11 as an object to be coated connected to the ground, and can be applied efficiently.

On the other hand, when the paint is sprayed from the rotary atomizing head 6, the first shaping air ejection hole 9 and the second shaping air ejection hole of the shaping air ring 7 are used to atomize the spray paint and adjust the coating pattern. The shaping air is ejected from 10.

When ejecting the first shaping air, compressed air is supplied from the first shaping air source 29 through the first air supply path 9A, and the first shaping air is ejected from each first shaping air ejection hole 9. Erupts. At this time, the first shaping air ejection hole 9 is inclined and opened in the direction opposite to the rotation direction of the rotary atomizing head 6. Thus, the first shaping air can collide from the front against the liquid yarn of the paint flying in the tangential direction from the discharge edge 6D of the rotary atomizing head 6, and atomizing the paint. Can do.

On the other hand, when the second shaping air is ejected, the compressed air is supplied from the second shaping air source 30 through the second air supply path 10A, and the second shaping air is ejected from each second shaping air ejection hole 10. Air is spouted out. At this time, the second shaping air ejection hole 10 supplies the second shaping air toward the outer peripheral surface 6 B of the rotary atomizing head 6. Thus, the second shaping air can adjust the size of the coating pattern widely in cooperation with the first shaping air.

Next, a method of painting the vehicle body 11 by the vehicle body painting system 21 equipped with the painting machine 1 will be described. Here, a part of the painting work of the body 11 will be described with reference to the time chart of FIG.

As an example of the painting work of the body 11, an example of a painting procedure when painting the outer surfaces of the left front fender 12A, the right front fender 12B, the radiator support 12K, and the inner surface of the engine hood 14 will be described. This painting operation is performed in the inner surface / outer surface simultaneous painting area 25 of the painting booth 22. In this case, the painting operation is performed by a set of the left painting robot 24 and the left painting machine 1L located upstream in the conveyance direction of the conveyance line 23, and a combination of the right painting robot 24 and the right painting machine 1R. Is done.

First, paint is sprayed on the left side of the inner surface of the engine hood 14 using the left coating machine 1L. The inner surface side of the engine hood 14 has an intermediate-sized paint surface. Therefore, when painting the inner surface side of the engine hood 14, the flow rate of the first and second shaping air, the amount of paint discharged, and the rotational speed of the rotary atomizing head 6 are set so that the painting pattern becomes an intermediate pattern. Controlled. That is, the pattern width (size) of the coating pattern is adjusted to 200 to 400 mm, which is an intermediate pattern. Thereby, it can coat efficiently so that a paint may not protrude from a paint surface by the paint pattern of the size suitable for a paint surface.

Then, paint is sprayed on the left part of the radiator support 12K using the left coating machine 1L. The radiator support 12K is a part of the inner surface and has a narrow painted surface. Therefore, when the radiator support 12K is to be painted, the pattern is changed to the minimum pattern even when the painting pattern is being painted with an intermediate pattern. That is, the flow rates of the first shaping air and the second shaping air, the discharge amount of the paint, and the rotation speed of the rotary atomizing head 6 are controlled so that the coating pattern becomes the minimum pattern. Specifically, the pattern width (size) of the coating pattern is adjusted to 50 to 100 mm which is the minimum pattern. Thereby, it can coat efficiently so that a paint may not protrude from a paint surface by the paint pattern of the size suitable for a paint surface.

On the other hand, when the engine hood 14 and the radiator support 12K are being painted using the left painting machine 1L, the outer surface of the right front fender 12B is painted using the right painting machine 1R in parallel with this painting operation. ing. The outer surface side of the right front fender 12B has a coating surface having an intermediate size. Therefore, when painting the outer surface side of the right front fender 12B, the pattern width (size) of the painting pattern is adjusted to 200 to 400 mm, which is an intermediate pattern. Thereby, it can coat efficiently so that a paint may not protrude from a paint surface by the paint pattern of the size suitable for a paint surface.

Further, when the left side portion of the inner surface of the engine hood 14 and the left side portion of the radiator support 12K are finished using the left side coating machine 1L, the right side of the inner side of the engine hood 14 is now used by using the right side coating machine 1R. Paint the right side and the right side of the radiator support 12K. In parallel with the painting of the right side portion of the inner surface of the engine hood 14 and the right side portion of the radiator support 12K, the outer surface of the left front fender 12A is painted using the left coating machine 1L. The painting pattern control by these paintings is the same as the above-described painting pattern control on the opposite side in the left and right directions, and will be omitted.

On the other hand, the outer surface of the engine hood 14 and the outer surface of the roof 12E of the body main body 12 have large painted surfaces. This outer surface coating is performed in the outer surface coating area 26. For example, when the left portion of the outer surface of the engine hood 14 is painted using the left coating machine 1L, the coating pattern is adjusted to a maximum pattern of 400 to 500 mm. Thereby, the left coating machine 1L can efficiently coat a wide painted surface. In addition, illustration of the time chart of the painting work in the outer surface painting area 26 is omitted.

Similarly, when the right side portion such as the outer surface of the engine hood 14 and the outer surface of the roof 12E of the body body 12 is painted, it is performed in the outer surface coating area 26. Also in this case, the coating pattern is adjusted to 400 to 500 mm which is the maximum pattern. Thereby, the right coating machine 1R can efficiently coat a wide painted surface. *

Thus, according to the present embodiment, the coating machine 1 includes an air motor 3 that uses compressed air as a power source, a hollow rotary shaft 4 that is rotatably supported by the air motor 3 and has a tip protruding forward from the air motor 3. A feed tube 5 that extends through the rotary shaft 4 to the tip of the rotary shaft 4 to supply the paint, an outer peripheral surface 6B that is attached to the tip of the rotary shaft 4 and expands in a cup shape, and is supplied from the feed tube 5 The rotary atomizing head 6 having an inner peripheral surface 6C for diffusing the applied paint and a discharge edge 6D that is located at the tip and discharges the paint, surrounds the outer periphery of the rotary atomizing head 6, and the tip is the rotary fog. A shaping air ring 7 disposed behind the discharge end edge 6D of the chemical head 6 is included. The shaping air ring 7 includes a large number of first shaping air ejection holes 9 that eject shaping air toward the periphery of the discharge edge 6D, and the radially inner side of each first shaping air ejection hole 9. A plurality of second shaping air ejection holes 10 are disposed so as to surround the rotary atomizing head 6 and eject the shaping air along the outer peripheral surface 6B of the rotary atomizing head 6.

On this, the coating machine 1 is formed as one type of coating machine having the same structure for spraying paint from the rotary atomizing head 6. Moreover, the coating machine 1 adjusts the size of the coating pattern when the paint is sprayed from the rotary atomizing head 6 to the minimum pattern, the maximum pattern, and the intermediate pattern between the minimum pattern and the maximum pattern. It is configured to be possible.

That is, the coating pattern of the coating machine 1 having the same structure is composed of three types: a minimum pattern (50 to 100 mm), a maximum pattern (400 to 500 mm), and an intermediate pattern (200 to 400 mm). In this case, these coating patterns can be adjusted while maintaining a good spray state. As a result, the coating machine 1 having the same structure can be used for both the inner surface coating and the outer surface coating of the body 11.

The vehicle body painting system 21 is provided with a plurality of painting robots 24. The painting machine 1 according to the present embodiment can be attached as a common painting machine to the plurality of painting robots 24. That is, the painting system 21 is provided with a plurality of assemblies including the painting machine 1 and the painting robot 24.

Therefore, each coating machine 1 can paint the inner surface and the outer surface of the body 11. Thereby, for example, when the inner surface of the body 11 is painted by the coating machine 1L located on the left side in the width direction of the transfer line 23, the coating machine 1R located on the right side is coated with the inner surface coating of the body 11 in parallel. The outer surface of the body 11 can be painted. That is, the painting machine 1L and the painting machine 1R can be operated at the same time, and the operating rate of the painting equipment can be improved. Further, by painting different painted surfaces simultaneously with two or more coating machines 1, the painting time of the body 11 can be shortened and the productivity can be improved.

By increasing the operating rate of one painting machine 1 and the painting robot 24, the number of assemblies including the painting machine 1 and the painting robot 24 can be reduced. Thereby, the painting booth 22 can be reduced in size. Further, by reducing the size of the painting booth 22, facilities such as an air conditioner and a waste paint recovery device for preparing the environment in the building 22 A can be reduced, and running costs can be reduced.

Furthermore, the coating machine 1 with the same structure is used as a common coating machine. Therefore, for example, when a failure occurs in one painting robot 24 or the painting machine 1 and it cannot be used, the painting machine 1 having a low operation rate among the remaining seven machines can be operated instead. Thereby, the spare coating machine 1 and the painting robot 24 can be made unnecessary.

On the other hand, according to the present embodiment, a vehicle body 11 includes a body main body 12 made of a structure that is long in the front and rear directions, and doors 13 that can be opened and closed on both the left and right sides of the body main body 12. And a front bumper 16 provided at the front end portion of the body main body 12, a rear bumper 17 provided at the rear end portion of the body main body 12, and a door knob 13 C as a small component provided in each door 13. The front bumper 16 is attached to the body main body 12 using a front bumper jig 19 with a gap formed between the front bumper 16 and the body main body 12. The rear bumper 17 is attached to the body main body 12 using a rear bumper jig 20 with a gap formed between the rear bumper 17 and the body main body 12.

Further, the body 11 is transported by the transport line 23 with the left and right doors 13, the front bumper 16 and the rear bumper 17 being attached to the body main body 12.

Therefore, when the body 11 is painted, the front bumper 16 and the rear bumper 17 can be painted at the same time. Thereby, the body 11 and each

bumper

16 and 17 can be finished in the same color. Further, by providing a gap between the body 11 and each

bumper

16, 17, the end surface (bumper edge) of each

bumper

16, 17 can be painted when each

bumper

16, 17 is painted. it can.

Further, each door knob 13C is disposed using a knob jig 18 in a non-painting space 13B located on the door 13 and excluded from the object to be painted. Thereby, the body 11 can paint the body main body 12, the left and right doors 13, and the door knobs 13C together, and the body main body 12 and the door knobs 13C can be finished in the same color.

The coating machine 1 (1L, 1R) serving as the one-side coating machine and the other-side coating machine includes a large number of shaping air ejection holes 9, 10 for adjusting the coating pattern of the paint sprayed from the rotary atomizing head 6. Have. In addition, the coating of the inner surface and the outer surface of the body 11 controls the flow rate of the shaping air ejected from the shaping air ejection holes 9 and 10. Thereby, the coating pattern of the paint can be adjusted to the minimum pattern, the maximum pattern, and the intermediate pattern.

As described above, the vehicle body painting system 21 according to the present embodiment is disposed on the left side in the width direction across the conveyance line 23 for conveying the vehicle body 11 having an inner surface and an outer surface, and the conveyance line 23. The coating machine 1L and the coating machine 1R arranged on the right side in the width direction across the conveyance line 23 are provided. Each of the

coating machines

1L and 1R is a coating machine having the same structure that sprays the paint from the rotary atomizing head 6, and the size of the paint coating pattern is the minimum pattern, the maximum pattern, the minimum pattern, and the maximum Adjustment is possible to an intermediate pattern that is intermediate to the pattern. In addition, the coating machine 1L uses the minimum pattern or the intermediate pattern to paint the inner surface on the left side of the body 11, and the coating machine 1R parallels the coating machine 1L that paints the inner surface on the left side of the body 11. The right outer surface of the body 11 can be painted using the maximum pattern or the intermediate pattern. Furthermore, the painting machine 1R uses the minimum pattern or the intermediate pattern to paint the inner surface on the right side of the body 11, and the coating machine 1L performs the painting on the right side inner surface of the body 11, The left outer surface of the body 11 can be painted using a maximum pattern or an intermediate pattern.

The left coating machine 1L controls the flow rate of the shaping air ejected from the first shaping air ejection hole 9 and the second shaping air ejection hole 10, thereby using the minimum pattern or the intermediate pattern on the left side of the body 11. In addition, the left outer surface of the body 11 is painted using the maximum pattern or the intermediate pattern. Further, the right coating machine 1R controls the body 11 using the maximum pattern or the intermediate pattern by controlling the flow rate of the shaping air ejected from the first shaping air ejection hole 9 and the second shaping air ejection hole 10. The right outer surface of the body 11 can be painted, and the right inner surface of the body 11 can be painted using a minimum pattern or an intermediate pattern.

The inner diameter dimension d1 of the first shaping air ejection hole 9 is set to 0.8 mm ≦ d1 ≦ 1.2 mm, and the inner diameter dimension d2 of the second shaping air ejection hole 10 is 0.5 mm ≦ d2 ≦ 0.8 mm. Is set to

The number N2 of the second shaping air ejection holes 10 is set to 1 / 3N1 ≦ N2 ≦ 1 / 2N1 of the number N1 of the first shaping air ejection holes 9.

The inclination angle α1 of the first shaping air ejection hole 9 is set to 40 degrees ≦ α1 ≦ 55 degrees with respect to the axis OO of the rotating shaft 4, and the inclination angle α2 of the second shaping air ejection hole 10 is It is set to 8 degrees ≦ α2 ≦ 15 degrees with respect to the axis OO of the rotating shaft 4.

The incident angle β of the second shaping air ejected from the second shaping air ejection hole 10 with respect to the outer peripheral surface 6B of the rotary atomizing head 6 is set to 12 degrees ≦ β ≦ 13.4 degrees.

In the embodiment, as the rotary atomizing head type coating machine 1, a direct charging type electrostatic coating machine that directly applies a high voltage to the paint supplied to the rotary atomizing head 6 will be described as an example. did. However, the present invention is not limited to this, and may be configured as a modification shown in FIG. That is, the rotary atomizing head type coating machine 31 has an external electrode 32 that discharges a high voltage at the outer peripheral position of the housing 2, and paint particles sprayed from the rotary atomizing head 6 by the discharge from the external electrode 32. You may comprise as an indirect charging type coating machine which applies a high voltage. Furthermore, the present invention can also be applied to a non-electrostatic coating machine that performs coating without applying a high voltage to the paint.

Further, in the embodiment, the case where each door knob 13C as a small part is arranged in the non-painting space 13B in the window frame 13A of the door 13 located on the rear side is illustrated. However, the present invention is not limited to this. For example, the door knob 13C may be disposed in the windshield window frame positioned between the engine hood 14 and the roof 12E and in the window frame of the back door 15. . In addition to the door knob 13C, the small parts include a door mirror cover, a lid that covers the fuel filler opening, and the like, and these small parts may be coated together with the body.

In the embodiment, the case where the rotary atomizing head 6 having a diameter of 40 mm is used is illustrated. However, the present invention is not limited to this. For example, a rotary atomizing head having a diameter dimension of 30 mm or less or a diameter dimension of 50 mm or more may be used. In a rotary atomizing head having a diameter of 30 mm, the number of first shaping air ejection holes is 40 to 45, and the number of second shaping air ejection holes is 24 to 30. In this case, the distance between the adjacent first shaping air ejection holes is set in the range of 2.2 mm to 2.8 mm. Further, the distance between the adjacent second shaping air ejection holes is set in the range of 3.0 mm to 3.8 mm.

On the other hand, in a rotary atomizing head having a diameter of 50 mm, the number of first shaping air ejection holes is 65 to 75, and the number of second shaping air ejection holes is 28 to 38. In this case, the interval between the adjacent first shaping air ejection holes is set in the range of 1.1 mm to 1.8 mm. Further, the distance between the adjacent second shaping air ejection holes is set in the range of 2.2 mm to 2.4 mm.

In the embodiment, the left painting machine 1L paints the left outer surface of the body 11 using the maximum pattern or the intermediate pattern, and the right painting machine 1R uses the maximum pattern or the middle pattern. The case where the right outer surface is painted has been described as an example. However, the present invention is not limited to this, and in the process in which the coating machine 1L paints the left outer surface of the body 11 using the maximum pattern or the intermediate pattern, the narrow portion of the left outer surface of the body 11 is not concerned. The coating machine 1L can perform coating using the minimum pattern. On the other hand, in the process in which the painting machine 1R paints the outer surface on the right side of the body 11 using the maximum pattern or the intermediate pattern, the coating machine 1R performs the minimum pattern for the narrow portion of the outer surface on the right side of the body 11. Can be used to paint.

Specifically, when the outer surface of the body 11 has a narrow painted surface (narrow portion) suitable for painting using the minimum pattern, for example, the left front pillar 12F and the right front pillar 12G of the body main body 12. The left coating machine 1L can coat the left front pillar 12F of the body main body 12 using the minimum pattern. Further, the right painting machine 1R can paint the right front pillar 12G of the body main body 12 using the minimum pattern.

In this case, by reducing the coating pattern in accordance with each

pillar

12F, 12G, which is a narrow portion of the painted surface, the amount of paint coming off the painted surface can be reduced. Thereby, the coating material discarded can be reduced. Moreover, since a coating material can be sprayed only to a narrow-width part, a suitable coating film can be formed. In addition to the left front pillar 12F and the right front pillar 12G, the left rear pillar 12H, the right rear pillar 12J of the body main body 12 and the window frame 13A of the door 13 are painted using a minimum pattern as a narrow portion of the outer surface of the body 11. can do.

Furthermore, in the embodiment, the painting booth 22 paints the inner surface / outer surface simultaneous painting area 25 for simultaneously painting the inner surface and the outer surface of the body 11 and the outer surface of the body 11 that has not been completely painted in the inner surface / outer surface simultaneous painting area 25. The case where the outer surface painting area 26 is provided is illustrated. However, the present invention is not limited to this, and when the entire body 11 can be painted only with the inner surface / outer surface simultaneous coating area 25, the outer surface coating area 26 may be omitted.

1,31 Rotary atomizing head type coating machine 1L Rotary atomizing head type coating machine (one side coating machine)
1R Rotary atomizing head type coating machine (other side coating machine)
DESCRIPTION OF SYMBOLS 3 Air motor 4 Rotating shaft 5 Feed tube 6 Rotating atomizing head 6B Outer peripheral surface 6C Inner peripheral surface 6D Discharge end edge 7 Shaping air ring 9 First shaping air ejection hole 10 Second shaping air ejection hole 11 Body 12 Body main body 12F Front left pillar (narrow part)
12G right front pillar (narrow width part)
12H Left rear pillar (narrow part)
12J Right rear pillar (narrow part)
13 Door 13A Window frame (narrow part)
13B Non-painting space 13C Door knob (small parts)
16 Front bumper 17 Rear bumper 18 Knob jig
19 Front bumper jig (jig)
20 Rear bumper jig (jig)
21 Vehicle Body Painting System 23 Conveyance Line OO Axis of Rotating Shaft N1 Number of First Shaping Air Blowout Holes N2 Number of Second Shaping Air Blowout Holes d1 Inner Diameter of Open End of First Shaping Air Blowout Hole d2 Inner diameter dimension of the opening end of the second shaping air ejection hole α1 Angle of the axis of the first shaping air ejection hole with respect to the axis of the rotation axis α2 Angle of the axis of the second shaping air ejection hole with respect to the axis of the rotation axis L1 Release Distance in the radial direction between the edge and the first shaping air ejection hole L2 Distance in the radial direction between the discharge edge and the second shaping air ejection hole β Second shaping air with respect to the outer peripheral surface of the rotary atomizing head Angle of incidence

Claims

A transport line for transporting a vehicle body having an inner surface and an outer surface;
A one-side coating machine disposed on one side in the width direction across the conveyance line;
The other side coating machine disposed on the other side in the width direction across the conveyance line, and
The one side coating machine and the other side coating machine are coating machines having the same structure for spraying paint from a rotary atomizing head, and the size of the paint coating pattern is a minimum pattern, a maximum pattern, It is configured to be adjustable to an intermediate pattern that is intermediate between the minimum pattern and the maximum pattern,
The one-side coating machine coats the inner surface on one side of the body using the minimum pattern or the intermediate pattern,
The other side coating machine uses the maximum pattern or the intermediate pattern to parallelize the outer surface on the other side of the body in parallel with the one side coating machine coating the inner surface on one side of the body. Painted and
The other side coating machine uses the minimum pattern or the intermediate pattern to coat the inner surface on the other side of the body,
The one-side coating machine uses the maximum pattern or the intermediate pattern to parallelize the outer surface on one side of the body in parallel with the other-side coating machine coating the inner surface on the other side of the body. A vehicle body painting method characterized by painting.
In the process in which the one-side coating machine coats the outer surface on one side of the body using the maximum pattern or the intermediate pattern, the one-side coating machine is Painted with the smallest pattern,
In the process in which the other side coating machine coats the outer surface on the other side of the body using the maximum pattern or the intermediate pattern, for the narrow portion of the outer surface, the other side coating machine 2. The vehicle body painting method according to claim 1, wherein painting is performed using a minimum pattern.
The one-side coating machine and the other-side coating machine have a large number of shaping air ejection holes for adjusting the coating pattern of the paint sprayed from the rotary atomizing head,
In the coating of the inner surface and the coating of the outer surface of the body, by controlling the flow rate of the shaping air ejected from the respective shaping air ejection holes, the coating pattern of the paint is the minimum pattern, the maximum pattern, and the The vehicle body painting method according to claim 1, wherein the vehicle body is adjusted to an intermediate pattern.
The body includes a body body composed of a structure that is long in the front and rear directions, a door that can be opened and closed on both the left and right sides of the body body, a front bumper that is provided at a front end of the body body, and A rear bumper provided at the rear end of the body body,
The front bumper is attached to the body body using a jig, with a gap formed between the front bumper and the body body,
The rear bumper is attached to the body body using a jig in a state where a gap is formed between the body and the body.
2. The vehicle body coating according to claim 1, wherein the body is transported by the transport line in a state where the left and right doors, the front bumper, and the rear bumper are attached to the body main body. Method.
The body includes a body body formed of a structure that is long in the front and rear directions, a door that can be opened and closed on each of the left and right sides of the body body, and a small part that is provided on the body body or the door. Comprising
The small part is disposed inside the body main body or the door and located in a non-painting space outside the object to be painted, using a jig,
The vehicle body painting method according to claim 1, wherein the body is transported by the transport line together with the body main body, the left and right doors, and the small parts.
A transport line for transporting a vehicle body having an inner surface and an outer surface;
A one-side coating machine disposed on one side in the width direction across the conveyance line;
The other side coating machine disposed on the other side in the width direction across the conveyance line, and
The one side coating machine and the other side coating machine are coating machines having the same structure for spraying paint from a rotary atomizing head, and the size of the paint coating pattern is a minimum pattern, a maximum pattern, It is configured to be adjustable to an intermediate pattern that is intermediate between the minimum pattern and the maximum pattern,
The one-side coating machine coats the inner surface on one side of the body using the minimum pattern or the intermediate pattern,
The other side coating machine uses the maximum pattern or the intermediate pattern to parallelize the outer surface on the other side of the body in parallel with the one side coating machine coating the inner surface on one side of the body. Painted and
The other side coating machine uses the minimum pattern or the intermediate pattern to coat the inner surface on the other side of the body,
The one-side coating machine uses the maximum pattern or the intermediate pattern to parallelize the outer surface on one side of the body in parallel with the other-side coating machine coating the inner surface on the other side of the body. A vehicle body painting system characterized by painting.
In the process in which the one-side coating machine coats the outer surface on one side of the body using the maximum pattern or the intermediate pattern, the one-side coating machine is Painted with the smallest pattern,
In the process in which the other side coating machine coats the outer surface on the other side of the body using the maximum pattern or the intermediate pattern, for the narrow portion of the outer surface, the other side coating machine The vehicle body painting system according to claim 6, wherein painting is performed using a minimum pattern.
The one side coating machine and the other side coating machine are:
An air motor powered by compressed air;
A hollow rotating shaft that is rotatably supported by the air motor and has a tip protruding forward from the air motor;
A feed tube extending through the rotary shaft to the tip of the rotary shaft to supply paint;
A rotating mist attached to the tip of the rotating shaft and having an outer peripheral surface that expands in a cup shape, an inner peripheral surface that diffuses the paint supplied from the feed tube, and a discharge edge that is positioned at the tip and discharges the paint With the head
A shaping air ring that surrounds the outer periphery of the rotary atomizing head and has a tip disposed rearward of the discharge end edge of the rotary atomizing head,
The shaping air ring is positioned inward of the plurality of first shaping air ejection holes for ejecting the shaping air toward the periphery of the discharge end edge, and radially inward of the first shaping air ejection holes. And a plurality of second shaping air ejection holes for ejecting shaping air along the outer peripheral surface of the rotary atomization head. The vehicle body coating system according to claim 6.
The one-side coating machine controls the flow rate of the shaping air ejected from the first shaping air ejection hole and the second shaping air ejection hole of the one-side coating machine, thereby reducing the minimum pattern or the intermediate pattern. Painting the inner surface on one side of the body using a pattern, and painting the outer surface on one side of the body using the maximum pattern or the intermediate pattern;
The other side coating machine controls the flow rate of the shaping air ejected from the first shaping air ejection hole and the second shaping air ejection hole of the other side coating machine, thereby increasing the maximum pattern or the intermediate pattern. 9. The structure according to claim 8, wherein the outer surface on the other side of the body is painted using a pattern, and the inner surface on the other side of the body is painted using the minimum pattern or the intermediate pattern. The vehicle body painting system described.
An inner diameter dimension (d1) of the first shaping air ejection hole is set to 0.8 mm ≦ d1 ≦ 1.2 mm, and an inner diameter dimension (d2) of the second shaping air ejection hole is 0.5 mm ≦ d2. 9. The vehicle body painting system according to claim 8, wherein ≦ 0.8 mm is set.
The number (N2) of the second shaping air ejection holes is set to 1 / 3N1 ≦ N2 ≦ 1 / 2N1 with respect to the number (N1) of the first shaping air ejection holes. The vehicle body painting system according to claim 8.
The inclination angle (α1) of the first shaping air ejection hole is set to 40 degrees ≦ α1 ≦ 55 degrees with respect to the axis (OO) of the rotating shaft, and the inclination of the second shaping air ejection hole 9. The vehicle body painting system according to claim 8, wherein the angle (α2) is set to 8 degrees ≦ α2 ≦ 15 degrees with respect to the axis (OO) of the rotating shaft.
An incident angle (β) of the second shaping air ejected from the second shaping air ejection hole with respect to the outer peripheral surface of the rotary atomizing head is set to 12 degrees ≦ β ≦ 13.4 degrees. The vehicle body painting system according to claim 8.