JP5148838B2 - Coating system and coating method - Google Patents

Description

  The present invention relates to a coating system and a coating method including at least an intermediate coating process and a top coating process for performing a coating process on a part of an outer plate and an inner plate of an object to be coated.

  In the painting line of an object to be painted, for example, an automobile body, a white body is subjected to an undercoating process (electrodeposition coating), an intermediate coating process, an overcoating process, an overcoating clear coating process, etc. for rust prevention. In addition, a baking and drying process is provided between the processes.

  In this type of painting line, a painting apparatus has been proposed for the purpose of reducing the number of painting robots and saving kinetic energy supplied to each painting booth (painting station) (Patent Document 1).

  As shown in FIG. 15, this coating apparatus is applied to an overcoating process set between an intermediate coating process and a baking process. The painting apparatus has a unitized painting booth 1 for base painting and a painting booth 2 for clear painting. The painting booths 1 and 2 are arranged in series along one transport path 3. Has been. In the painting booths 1 and 2, a plurality of spray painting robots 4 and 5 are arranged, respectively.

  The upper coating device is the first module A, the lower coating device is the second module B, and the production capacities of the first module A and the second module B are each set to a minimum production amount. In order to increase the production amount, the first module A and the second module B are simultaneously operated in parallel. On the other hand, when the production capacity is reduced, for example, the second module B is stopped.

JP 2001-129449 A (FIG. 1)

  In the above-mentioned painting line, the first module A and the second module B set to the same painting condition are only arranged in parallel corresponding to the production amount. However, the paint color of the automobile body is set in many kinds, and the clear coating may be performed twice in addition to the case where the top coating is performed twice. Therefore, in order to apply to this type of diversification, a large number of coating lines must be provided, and the entire coating facility becomes considerably large and complicated. As a result, the above-described conventional technology has a problem that it cannot cope with the recent increase in the number of paint colors and the production of a variety of products in small quantities.

  The present invention solves this type of problem, and it is possible to reduce the size of the entire equipment and to easily cope with high-mix low-volume production, and to perform an efficient painting operation. And to provide a painting method.

  The present invention relates to a coating system including at least an intermediate coating process and a top coating process for performing a coating process on a part of an outer plate and an inner plate of an object to be coated. The intermediate coating process and the top coating process are provided in parallel to each other on the coating line, and the intermediate coating process includes, for example, two or more coating stations having different coating colors. In addition, the top coating process includes, for example, two or more coating stations having different coating colors.

  In addition, it includes a top coat clear coating process that is arranged in parallel with the intermediate coating process and the top coat painting process, and the top coat clear coating process includes, for example, a first layer clear coating and a two layer clear coating. It is preferred to have two or more painting stations to perform.

  Furthermore, it is preferable to provide a return line that returns the object to be coated from the downstream of the coating line in the intermediate coating process, the top coating process, and the clear clear coating process to the upstream of the coating line.

  Furthermore, it is preferable that a plurality of setting units and heating units are arranged in parallel downstream of the coating line of the intermediate coating process, the top coating process, and the top coating clear coating process.

  The present invention also relates to a coating method for coating at least an intermediate coating process and a top coating process on a part of an outer plate and an inner plate of an object to be coated. The intermediate coating process and the top coating process are provided in parallel with each other with respect to the coating line, and one coating station is selected from the two or more coating stations in the intermediate coating process. An intermediate coating is applied to the painted object. Next, after returning the object to be coated to the top coating process along the return line, one coating station is selected from the two or more painting stations in the top coating process and the top coating is performed on the object to be coated. .

  Furthermore, it has a top coat clear coating process in parallel with the intermediate coating process and the top coating process, and one of the two or more coating stations in the top coat clear coating process is selected to clear the top coat on the object to be coated. It is preferable to carry out.

  Furthermore, it is preferable that the object to be coated sequentially pass through at least the setting section or the heating section every time desired coating is performed in the intermediate coating process, the top coating process, and the top coating clear coating process.

  In the present invention, the intermediate coating process and the top coating process each having two or more coating stations are provided in parallel with each other on the coating line. For this reason, it is only necessary to select a coating station having a desired coating color when changing coating conditions, for example, changing the coating color, and quick and easy setup change for color change and setup change for model change. Carried out. Accordingly, it is possible to easily cope with a variety of small-quantity production and to perform an efficient painting operation.

  In addition, since the painting work can be speeded up at each painting station, even if the painting robot is also used as a door opening / closing robot, the entire painting work is not delayed. As a result, the number of robots can be reduced well, and the entire equipment can be easily made compact.

  Furthermore, the intermediate coating process and the top coating process are arranged in parallel, and when the coating specifications are changed, it is only necessary to change the number of each coating station in the intermediate coating process and the top coating process.

  For example, when the number of times of top coating increases, the number of painting stations in the intermediate coating process may be reduced while the number of coating stations in the top coating process may be increased. For this reason, it can respond to various coating specifications easily and quickly, is excellent in versatility, and an efficient coating operation is reliably performed.

  FIG. 1 is a schematic configuration explanatory view of a coating system 10 according to the first embodiment of the present invention.

  The painting system 10 includes a painting line 12 that faces in the painting flow direction (arrow X direction). The coating line 12 includes an intermediate coating process 14, a top coating process 16, and a top coating clear coating process 18 arranged in parallel with each other along the arrow Y direction orthogonal to the coating flow direction.

  In the intermediate coating step 14, the first intermediate coating station 20a, the second intermediate coating station 20b, the third intermediate coating station 20c, and the fourth intermediate coating station 20d are arranged in parallel along the arrow Y direction. Provide.

  Each of the first intermediate coating station 20a to the fourth intermediate coating station 20d includes a plurality of coating robots 22a, 22b, 22c, and 22d. The coating robots 22a to 22d perform an intermediate coating process on a part of the outer plate and the inner plate of the vehicle body W that is the object to be coated, and at least a part also functions as a door opening / closing robot. .

  The first intermediate coating station 20a to the fourth intermediate coating station 20d constitute coating stations with different coating conditions, for example, four different coating colors, with respect to the vehicle body W conveyed to the coating line 12. . The first intermediate coating station 20a and the second intermediate coating station 20b are set to the same coating color, while the third intermediate coating station 20c and the fourth intermediate coating station 20d are set to the same coating color. By setting, two painting stations having different painting colors may be configured.

  The top coating process 16 includes arrows for the first top coating station 24a, the second top coating station 24b, the third top coating station 24c, the fourth top coating station 24d, the fifth top coating station 24e and the sixth top coating station 24f. They are provided in parallel along the Y direction. Each of the first top coating station 24a to the sixth top coating station 24f includes a plurality of coating robots 26a, 26b, 26c, 26d, 26e, and 26f.

  The first top coating station 24a to the sixth top coating station 24f selectively perform top coating processes with different coating conditions, for example, different coating colors, on the vehicle body W transported along the coating line 12. Apply. The type of paint color can be set arbitrarily.

  The topcoat clear coating process 18 includes a first topcoat clear coating station 28a, a second topcoat clear coating station 28b, and a third topcoat clear coating station 28c. The first topcoat clear coating station 28a to the third topcoat clear coating station 28c each include a plurality of coating robots 30a, 30b, and 30c.

  The first topcoat clear coating station 28a to the third topcoat clear coating station 28c can form a plurality of clear layers on the vehicle body W transported along the coating line 12, as will be described later.

  The first intermediate coating station 20a to the fourth intermediate coating station 20d, the first upper coating station 24a to the sixth upper coating station 24f, and the first upper coating clear coating station 28a to the third upper coating station 28c are indicated by arrows. The air conditioning booth is arranged on a straight line along the Y direction and is individually or integrally air-conditioned.

  Downstream of the intermediate coating process 14, the top coating process 16 and the clear clear coating process 18 in the coating flow direction, the first setting unit 32a and the first drying furnace (heating unit) 34a, and the second setting unit 32b and the second drying are performed. The furnace 34b, the third setting part 32c and the first preheating part (heating part) 36a, the fourth setting part 32d and the second preheating part 36b are arranged in parallel along the arrow Y direction.

  The coating line 12 includes an intermediate coating process 14, a top coating process 16, and a top coating clear coating process 18 from the downstream of the first drying furnace 34 a, the second drying furnace 34 b, the first preheating part 36 a, and the second preheating part 36 b in the coating flow direction. A first return line 38 is provided for returning to the upstream side. A fifth setting portion 32e and a third drying furnace 34c are disposed downstream of the first return line 38, and a second return is provided from the downstream of the third drying furnace 34c to the first return line 38. A line 40 is provided.

  The first setting section 32a to the fifth setting section 32e are used to rework the coating body, evaporate the solvent, or settle the coating on the vehicle body W that has undergone the intermediate coating process, the top coating process, and the top coating clear coating process. It is a station to let you. The first drying furnace 34a to the third drying furnace 34c are stations for drying the coating film. The 1st preheating part 36a and the 2nd preheating part 36b are stations which perform preheating processing to body W after top coat painting.

  Specifically, the first preheating part 36a and the second preheating part 36b temporarily apply the top coating to the vehicle body W that has undergone the top coating process in order to bring the solid content of the top coating to an appropriate range. This is a drying station, and includes, for example, an infrared irradiation device and / or a hot air supply device.

  Each function described above can be changed depending on the type of paint.

  The operation of the coating system 10 configured as described above will be described below in relation to the coating method according to the present invention.

  First, as shown in FIG. 2, a case where a standard type coating pattern is applied to the vehicle body surface Wa of the vehicle body W will be described. In this standard type, an electrodeposition layer 46, an intermediate coating layer 48, a base layer (overcoat layer) 50, and a clear layer 52 are sequentially formed on the vehicle body surface Wa.

  Therefore, the standard-type coating process will be described in detail with reference to the flowchart shown in FIG. 3. Electrodeposition coating using a water-soluble paint is applied to the vehicle body surface Wa in advance by a primer coating process (not shown). Thus, the electrodeposition layer 46 is formed (step S1).

  The vehicle body W is transported to the intermediate coating process 14 after the electrodeposition layer 46 is dried in a drying furnace (not shown) (step S2). In the intermediate coating step 14, the vehicle body W is supplied to the first intermediate coating station 20a, for example, corresponding to a desired coating color. In the first intermediate coating station 20a, the outer plate of the vehicle body W is painted through a plurality of coating robots 22a, and the door opening operation is performed by an arbitrary coating robot 22a. The part is painted. Thereby, the intermediate coating layer 48 is formed on the electrodeposition layer 46 (step S3).

  The vehicle body W that has been subjected to intermediate coating by the first intermediate coating station 20a is, for example, conveyed to the first setting unit 32a and subjected to processing such as reworking of the coating, and then carried into the first drying furnace 34a. The After the paint drying process is performed in the first drying furnace 34a (step S4), the vehicle body W is returned to the upstream in the coating flow direction via the first return line 38 and is transported to the top coating process 16.

  In the top coating process 16, the first top coating station 24a to the third top coating station 24c corresponding to the vehicle body W are set according to different paint colors, and the vehicle body W is, for example, the first top coating station. It is carried into the station 24a. The first top coating station 24a is provided with a plurality of coating robots 26a, and a part of the outer plate and inner plate of the vehicle body W is subjected to a top coating process on the intermediate coating layer 48. Base layer 50 is formed (step S5).

  The vehicle body W after the top coating process is sent to, for example, the third setting unit 32c and subjected to processing such as reworking the coating, and then sent to the first preheating unit 36a. After the vehicle body W is preheated to a predetermined temperature in the first preheating part 36a (step S6), it is returned to the upstream in the coating flow direction via the first return line 38, and in the top coat clear coating process 18, for example, It is sent to the first overcoat clear coating station 28a. In the first overcoat clear coating station 28a, the clear layer 52 is formed on the base layer 50 by the plurality of coating robots 30a (step S7).

  The vehicle body W for which the top coat clear coating has been completed is sent to the fifth setting unit 32e, further subjected to a drying process in the third drying furnace 34c (step S8), and sent to the subsequent process.

  Next, the coating process by the 1st coating pattern shown in FIG. 4 is demonstrated. In the first coating pattern, the electrodeposition layer 46, the intermediate coating layer 48, the first base layer 50a, the second base layer 50b, and the clear layer 52 are formed on the vehicle body surface Wa.

  Therefore, in the following description in detail with reference to the flowchart shown in FIG. 5, first, steps S11 to S14 are performed in the same manner as steps S1 to S4 described above. Furthermore, the vehicle body W is sent to, for example, the first topcoat coating station 24a in the topcoat coating process 16 to form the first base layer 50a (first step S15).

  The vehicle body W on which the first base layer 50a is formed passes through the third setting portion 32c and the first preheating portion 36a (step S16), and then returns to the upstream side of the top coating process 16 via the first return line 38. It is. The vehicle body W is then sent to, for example, the second top coat station 24b, and the second base layer 50b is formed on the first base layer 50a via the plurality of painting robots 26b (step S17).

  The vehicle body W on which the second base layer 50b is formed is preheated through the third setting portion 32c and the first preheating portion 36a (step S18), and then upstream of the overcoating process 16 via the first return line 38. Back to the side. In this overcoating clear coating process 18, the vehicle body W is sent to the first overcoating clear coating station 28a to form the clear layer 52 (step S19). The vehicle body W after completion of the top coat clear coating is dried through the fifth setting section 32e and the third drying furnace 34c (step S20) and then carried out to the next process.

  Furthermore, the coating process by the 2nd coating pattern shown in FIG. 6 is demonstrated. In the second coating pattern, the electrodeposition layer 46, the intermediate coating layer 48, the first base layer 50a, the second base layer 50b, the first clear layer 52a, and the second clear layer 52b are formed on the vehicle body surface Wa.

  In the second painting pattern, painting processing is performed in accordance with the flowchart shown in FIG. 7, and Steps S31 to S28 are performed in the same manner as Steps S11 to S18 described above.

  Then, the vehicle body W on which the second base layer 50b is formed is returned to the upstream side of the top coating process 16 from the first preheating portion 36a via the first return line 38. In the top coating process 16, the vehicle body W is sent to the first top coating clear coating station 28a, and the first clear layer 52a is formed on the second base layer 50b (step S39). The vehicle body W on which the first clear layer 52a is formed is dried through the second setting portion 32b and the second drying furnace 34b (step S30), and then passed through the first return line 38 to perform the overcoat clear coating process 18. Is once returned to the upstream side.

  The vehicle body W is sent to, for example, the second topcoat clear coating station 28b, and the second clear layer 52b is formed on the first clear layer 52a via the plurality of coating robots 30b (step S41). The vehicle body W on which the second clear layer 52b is formed is dried through the fifth setting portion 32e and the third drying furnace 34c (step S42), and then carried out to the next process.

  In this case, in the first embodiment, the intermediate coating process 14 having the first intermediate coating stations 20a to 20d, the top coating process 16 having the first top coating station 24a to the sixth top coating station 24f, and the first The top coat clear coating process 18 having the top coat clear coating station 28 a to the third top coat clear coating station 28 c is provided in parallel to the coating line 12.

  Therefore, it is possible to adjust the painting time when the number of paintings is changed according to the painting specifications. This is because, by shortening the tact, a decrease in the total production number can be easily avoided. Moreover, in the coating line 12, when changing the coating conditions, for example, when changing the paint color, the color change setup change and the model change setup change are quickly and easily performed.

  Specifically, when top coating is applied to the vehicle body W using the first top coating station 24a to the third top coating station 24c constituting the coating system 10, as shown in FIG. The case where the top coat is applied to the vehicle body W by using the conventional top coat process 66 in which the first outer plate coating station 62 and the second outer plate coating station 64 are arranged in series will be described.

  The conventional top coating process 66 includes an opener 67 that opens and holds the hood (bonnet) of the vehicle body W, and a door opening and closing robot 68. A plurality of painting robots 70a, 70b, and 70c are disposed in the inner plate painting station 60, the first outer plate painting station 62, and the second outer plate painting station 64, respectively.

  In the conventional top coat process 66, as shown in FIG. 9, first, the hood inner plate side is coated in a state where the hood is held open by the opener 67. Next, the inner plate of the vehicle body W is painted by the painting robot 70a in a state where the door is opened by the door opening / closing robot 68.

  Then, after the door is closed, the coating process is interrupted for a predetermined color change time before the first outer panel coating station 62 starts the coating of the outer panel of the vehicle body W. The color change time is substantially set in common when the paint color is not changed and when the paint color is changed. If necessary, the color change time is within the color change time. Changeover work including cup washing is being performed.

  After a predetermined color change time elapses, the vehicle body W is coated with an outer plate via a coating robot 70 b that constitutes the first outer plate coating station 62. Further, after the painting is stopped for a predetermined color change time, the vehicle body W is coated with the outer plate via the painting robot 70c constituting the second outer plate coating station 64.

  On the other hand, in the top coating process 16 of the first embodiment, as shown in FIG. 10, for example, when the top coating of a part of the outer plate and the inner plate of the vehicle body W is performed by the first top coating station 24a. First, the hood is painted via the right painting robot 26a in a state where the hood is held open by the left painting robot 26a. Next, with the hood being held open by the right painting robot 26a, the remaining coating of the hood is painted by the left painting robot 26a.

  Further, when a part of the inner plate is painted in a state where the door is opened by each painting robot 26a, the painting robot 26a closes the door and the used painting robot 26a is washed by the cup. After that, the outer plate of the vehicle body W is painted by the left and right painting robots 26a. And while the cup washing of the used painting robot 26a is performed, the outer plate of the vehicle body W is painted by the other painting robot 26a.

  As described above, in the conventional top coating process 66, after coating is performed at the inner panel coating station 60, the first outer panel coating station 62, and the second outer panel coating station 64, the coating is performed for a predetermined color change time. Has been interrupted. This color change time requires a longer time than the time required for actual cup cleaning, and there is a problem that the painting operation is stopped unnecessarily, and the entire painting operation is considerably prolonged.

  On the other hand, in the first embodiment, the first top coating station 24a to the third top coating station 24c stand by so as to be able to apply paints having different coating colors, and the vehicle body W is changed to the first when the color is changed. It is only necessary to transfer from the first top coat station 24a to, for example, the second top coat station 24b. Thereby, in particular, it is possible to easily cope with a large variety of small-quantity production, and to obtain an effect that it is possible to perform an efficient painting operation.

  In addition, since the unnecessary color change waiting time is eliminated, the entire painting operation is easily performed quickly and in a short time. For this reason, for example, even if the painting robot 26a is also used as a door opening / closing robot, the entire painting operation is not delayed. Therefore, there is an advantage that the number of robots is favorably reduced and the entire equipment is made compact and economical.

  Furthermore, in the conventional top coating process 66, it is necessary to provide an air conditioning booth covering the inner plate coating station 60 to the second outer plate coating station 64, and the total length of this air conditioning booth includes the conveyance path of the vehicle body W. It becomes long. On the other hand, in the first embodiment, for example, the air conditioning booth covering the first topcoat coating station 24a is limited to a range surrounding the vehicle body W, and thus the air conditioning energy can be reduced favorably.

  Furthermore, in the first embodiment, the number of stations constituting the intermediate coating process 14, the top coating process 16, and the top coating clear coating process 18 can be easily increased or decreased according to the coating pattern for the vehicle body W. For example, the first coating pattern shown in FIG. 4 employs a two-layer base structure of a first base layer 50a and a second base layer 50b, and it is desirable to increase the coating color in the top coating process 16.

  Therefore, as shown in FIG. 11, the intermediate coating process 14a having the first intermediate coating station 20a to the third intermediate coating station 20c, and the top coating having the first upper coating station 24a to the seventh upper coating station 24g. The step 16a and the topcoat clear coating step 18 having the first topcoat clear coating station 28a to the third topcoat clear coating station 28c are configured in parallel with each other.

  That is, instead of the fourth intermediate coating station 20d in the intermediate coating process 14a, a seventh upper coating station 24g in the top coating process 16a is arranged. The seventh topcoat painting station 24g includes a plurality of painting robots 26g. Thereby, the effect that the paint switching operation from the standard-type paint pattern to the first paint pattern is performed easily and in a short time can be obtained.

  Furthermore, in order to correspond to the second coating pattern shown in FIG. 6, the model setup change shown in FIG. 12 is performed. In the second coating pattern, a two-layer base structure of the first base layer 50a and the second base layer 50b is adopted, and a two-layer clear structure of the first clear layer 52a and the second clear layer 52b is adopted.

  That is, in order to correspond to the second coating pattern, the intermediate coating process 14b having the first intermediate coating station 20a and the second intermediate coating station 20b, and the first top coating station 24a to the seventh top coating station 24g are provided. The top coating process 16a having the first top coating clear coating station 28a to the top coating clear coating process 18a having the fourth top coating clear coating station 28b are arranged in parallel with each other.

  Specifically, instead of the third intermediate coating station 20c, it is only necessary to install a fourth overcoat clear coating station 28d having a plurality of coating robots 30d. As a result, it is possible to easily and quickly cope with changes in various coating patterns, and it is possible to obtain an effect that the versatility is excellent and an efficient painting operation is reliably performed.

  Further, depending on the paint used in FIG. 1, the first drying furnace 34a and the second drying furnace 34b may be replaced with preheating parts, or the first drying furnace 34a, the second drying furnace 34b, the first preheating part 36a and the second drying furnace 34b. The preheat part 36b can also be deleted. Furthermore, in the coating line 12, by using the second return line 40, the fifth setting part 32e and the third drying furnace 34c can be repeatedly used.

  FIG. 13 is a schematic configuration explanatory diagram of a coating system 80 according to the second embodiment of the present invention. In addition, the same referential mark is attached | subjected to the component same as the coating system 10 which concerns on 1st Embodiment, and the detailed description is abbreviate | omitted.

  The coating system 80 is provided with a water sharpening station 82 in addition to the intermediate coating process 14. The water sharpening station 82 has a function of improving the hue, depth, smoothness, etc. of the coating film by polishing the coating film after the intermediate coating treatment.

  The coating process by the coating system 80 will be described along the flowchart shown in FIG.

  First, Steps S51 to S54 are performed in the same manner as Steps S1 to S4 described above. Further, the vehicle body W is returned by the first return line 38 and sent to the water sharpening station 82. In the water sharpening station 82, the intermediate coating film of the vehicle body W is polished (step S55), and then sent to, for example, the third setting unit 32c. The vehicle body W is sent from the third setting portion 32c to the first preheating portion 36a, and drained and dried by the first preheating portion 36a (step S56).

  Next, the vehicle body W is conveyed to the top coating process 16 via the first return line 38, and is subjected to a coating process along steps S57 to S60.

  Thus, in the second embodiment, it is not necessary to use a dedicated draining and drying furnace in order to perform the draining and drying process on the vehicle body W that has been subjected to the polishing process at the water sharpening station 82. The preheating part 36a can also serve as the draining and drying furnace. Thereby, the effect of being extremely economical can be obtained.

It is a schematic structure explanatory view of the painting system concerning a 1st embodiment of the present invention. It is explanatory drawing of a standard type coating pattern. It is a processing flowchart of the standard type coating pattern. It is explanatory drawing of a 1st coating pattern. It is a process flowchart of the said 1st coating pattern. It is explanatory drawing of a 2nd coating pattern. It is a process flowchart of the said 2nd coating pattern. It is explanatory drawing of the conventional top coat process. It is a time chart of the said conventional overcoating process. It is a time chart of the top coat process of a 1st embodiment. In the said coating system, it is schematic structure explanatory drawing corresponding to a 1st coating pattern. In the said coating system, it is schematic structure explanatory drawing corresponding to a 2nd coating pattern. It is schematic structure explanatory drawing of the coating system which concerns on the 2nd Embodiment of this invention. It is a process flowchart in the said coating system. It is explanatory drawing of the overcoating process of patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,80 ... Coating system 12 ... Coating line 14, 14a, 14b ... Intermediate coating process 20a-20d ... Intermediate coating station 16, 16a ... Top coating process 18, 18a ... Top coating clear coating process 32a-32e ... Setting part 34a 34c ... drying furnaces 36a and 36b ... preheating sections 22a to 22d, 26a to 26g, 30a to 30d ... painting robots 24a to 24g ... topcoat painting stations 28a to 28d ... topcoat clear painting stations 38 and 40 ... return line 82 ... water sharpening station

Claims (7)

A coating system comprising at least an intermediate coating process and a top coating process for performing a coating process on a part of an outer plate and an inner plate of an object to be coated,
The intermediate coating process and the top coating process are provided in parallel with each other on the coating line,
The intermediate coating process and the top coating process each have two or more coating stations arranged in parallel with each other,
A return line for returning the object to be coated from a downstream side of the intermediate coating process to an upstream side of the top coating process;
The return line is a common return line for returning the object to be coated from the downstream side of one coating station in the top coating step to the upstream side of another coating station in the top coating step. Painting system. The coating system according to claim 1, further comprising a top clear coating step parallel to the intermediate coating step and the top coating step.
The top coating clear coating process has two or more coating stations arranged in parallel with each other.   3. The coating system according to claim 2, wherein the return line is a common return line that returns the object to be coated from a downstream painting line to an upstream painting line of the top clear coating process.   4. The coating system according to claim 2, wherein a plurality of setting units and heating units are arranged in parallel downstream of the coating line of the intermediate coating process, the top coating process, and the top coating clear coating process that are arranged in parallel. A painting system characterized by that. A coating method for coating at least an intermediate coating process and a top coating process on a part of an outer plate and an inner plate of an object to be coated,
The intermediate coating step and the top coating step are provided in parallel with each other with respect to the coating line, each having two or more coating stations that are in parallel with each other with respect to the coating line,
After selecting one of the two or more coating stations in the intermediate coating process and performing an intermediate coating on the object, the object is applied to the top coating process along a return line. Returning to the upstream side, and then selecting one of the two or more coating stations in the top coating step to perform top coating on the object to be coated.   The coating method according to claim 5, further comprising a top coat clear coating step parallel to the intermediate coating step and the top coating step, and one coating station among two or more coating stations in the top coating clear coating step. A coating method comprising: selecting and performing a clear clear coating on the object to be coated. The coating method according to claim 6 , wherein the object to be coated sequentially passes through at least a setting section or a heating section every time desired coating is performed in the intermediate coating process, the top coating process, and the clear clear coating process. The painting method characterized by doing.

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