JPS63141671A - Method for conveying vehicle body in painting line - Google Patents

Abstract

PURPOSE:To avert the action of the force, which is generated by supporting a vehicle body on a carrier, on the weakest part of the coated film layer of said body by changing the position to be supported of the vehicle body in respective stages of a painting line. CONSTITUTION:The vehicle body B is successively conveyed to a surface treatment device and electrodeposition device and is formed thereon with an electrodeposition coated film in the painting line having the plural stages for supporting and conveying the vehicle body by the carriage. The vehicle body B is transferred to the carriage 17 at the time of starting the electrodeposition drying stage after the electrodeposition stage but since the body B is supported on the carriage 17 right after the electrodeposition stage, the drying of the coated film in the part P1 to be supported of the body B is not enough and the exfoliation of the coated film in said part is resulted. The body B is imposed on the carriage during the course of the ensuing stage but the part P1' to be supported is different from the above-mentioned part P1 to be supported. The force to be generated by supporting the body B on the carriage is, therefore, not acted on the weakest part P1 of the coated film layer. The damage of the coated film layer is thus prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for transporting vehicle bodies in a painting line.

(Prior art) A painting line generally has a surface treatment process, an electrodeposition process, an electrodeposition drying process, an undercoat process, an intermediate coating process, an intermediate coating drying process, a top coating process, and a top coating drying process. They are transported in order. An overhead conveyor is used in the surface treatment process and undercoat process as a means of conveying the car body, and in the electrodeposition drying process,
A trolley is used in the intermediate coating process, intermediate coating drying process, top coating process, and top coating drying process. The overhead conveyor is configured to transport the car body by suspending it by a hanger device, and the truck is configured to support and transport the car body on the truck. are also supported by the trolley at the same supported position.

By the way, in the above-mentioned painting line, when entering the electrodeposition drying process after the electrodeposition process, the car body is transferred from the overhead conveyor to the trolley, but the car body is supported on the trolley immediately after the electrodeposition process. As a result, the paint film on the supported portion of the vehicle body is insufficiently dried, and the paint film on that portion peels off. However, in the undercoat step after the electrodeposition drying step, the parts of the car body where the paint film has peeled off are also undercoated, so that there are no parts of the car body where the paint film has peeled off.

(Problem to be Solved by the Invention) However, in the above painting line, in the undercoat process, coating defects are also formed on the parts of the car body where the electrodeposited coating has been peeled off, but the intermediate coating after the undercoat process In the process, the same supported position of the car body is supported again by the truck, so the force generated by supporting the car body on the truck acts on the weakest part of the coating layer, and the supported position of the car body There was a risk that the paint layer at the location would be damaged.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent damage to the paint layer at the supported position of the vehicle body.

(Means and operations for solving the problem) In order to achieve the above object, the present invention provides a coating line that carries out multiple steps of supporting and transporting the car body using a trolley. This is a method of transporting a vehicle body in a painting line, which is characterized by changing the supported position.

With the above configuration, the supported position of the car body is changed for each process in the painting line, so it is possible to avoid applying the force generated by supporting the car body on the trolley to the weakest part of the paint layer of the car body. be able to.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, to explain the apparatus for carrying out the method according to the present invention, l is a painting line, and the painting line l includes a surface treatment apparatus 2 for performing a surface treatment process, and an electrodeposition apparatus 3 for performing an electrodeposition (undercoating) process. , an electrodeposition drying device M4 that performs an electrodeposition drying process, an undercoat device R5 that performs an undercoat process, an intermediate coating device 6 that performs an intermediate coating process, an intermediate coating drying device 7 that performs an intermediate coating drying process, and a top coating unit that performs a top coating process. The coating line is equipped with a coating drying device 18 and a top coating drying device 9 that performs a top coating drying process.
Steps 2 to 9 in step 2 are the processes that are normally carried out. In other words, the surface treatment device 2 completely removes oils adhering to the vehicle body B and forms a chemically stable inorganic film on the surface of the steel plate. Form. This inactivates the surface of the steel plate, imparts anti-rust properties, and improves the adhesion between the steel plate and the coating film.

In the electrodeposition device 3, electrodeposition coating is performed for the purpose of rust prevention. In the electrodeposition drying device 4, drying is performed after thorough washing with water. The undercoat device 5 is used for rust prevention and soundproofing of the underside of the vehicle.

Thick S coating for heat protection is applied. In the intermediate coating M6, coating is mainly performed to fill pinholes and small irregularities on the undercoat (electrodeposition) surface. In the intermediate coat drying device 7, the intermediate coat film is baked and dried. In the top coating station 8, coating is performed for the purpose of imparting aesthetic appearance and durability against the environment. In the top coat drying device 9, the top coat film is baked and dried.

In this coating line 1, an overhead conveyor IO passes between the surface treatment device 2 and the electrodeposition device 3. This overhead conveyor 10 also passes through the lifter device 11, 12, 13, 14, and the overhead conveyor 10 includes the lifter device 11, the surface treatment device 2
, electrodeposition device 3 and lifter device 12.13.14 constitute an endless conveyor line. This overhead conveyor 10 is provided with a plurality of commonly used hanger devices (paths shown), and the vehicle bodies B are suspended and sequentially conveyed by each hanger device. Each lifter device 11.12.13.14 has a function of moving the vehicle body B in the vertical direction, and in the lifter devices 11, 13 and the hanger device, the lifter device 11. There is a relationship in which the vehicle body B is passed from the device 11.13 to the hanger device, and the lifter device 12.1
4 and the hanger device, the lifter device fi12.
14 from the hanger device to the lifter device 12 at each upper position.
．． There is a relationship in which body B is handed over to No. 14.

Lifter device 12, electrodeposition drying device 4 and lifter device 1
A floor conveyor 15 passes through 3. This floor conveyor 15 passes through these three parts 12.4.13 to form an endless conveyor line. This floor conveyor 15 is composed of a bogie running rail 16 and a plurality of bogies 17. The bogie running rail 16 has three rails 16
a, 16b, 16c, each rail 16a, 16b
, 16c form parallel floor conveyor lines. The truck 17 is provided so as to be able to run on the truck running rail 16 via wheels 18, and a drive chain (not shown) is connected to the truck 17 via a connecting member 19, and the truck 17 is shown in FIG. , Support rods 20.21 are provided on the 0-carriage 17 that is to be transported to the left, and each support rod 20.2 is designed to extend the width of the cart 17 in order to support the car body B. (vertical direction in FIG. 2) and are arranged at predetermined intervals in the front-rear direction (leftward direction in FIG. 3) of the truck 17. A forward shift regulating member 22 and a lateral shift regulating member 23 are respectively attached to the support rod 20, and forward shift and lateral shift are regulated by the re-regulating members 22 and 23. A rear displacement regulating member 24 and a lateral displacement regulating member 25 are attached to the support rod 21, and rear displacement and lateral displacement are prevented by the re-regulating members 24 and 25. There is a relationship between the bogie 17 and the lifter device 12, in which the vehicle body B is transferred from the lifter device 12 to the bogie 17 at a position below the lifter device 12.
113, the vehicle body B is transferred from the truck 17 to the lid device 13 at a position below the beam lid device 2i13.

The undercoating device 5 is connected to an overhead conveyor 2.
This overhead conveyor 26 also passes through the lifter devices H27 and 28, and the overhead conveyor 26 constitutes an endless conveyor line passing through the lifter device 27, the undercoat device 5, and the lifter device 28. There is. This overhead conveyor 2
6 is provided with a plurality of hanger devices similar to the overhead conveyor 10, and the vehicle body B is conveyed by each of the hanger devices. Each lifter equipment ff127.
28 also has the same function as the lifter devices 11, 12, 13, and 14, and in the hanger device and lid device 27 of the overhead conveyor 26, the vehicle body B is placed above the lifter device 27. There is a relationship between the hanger device and the lid device 28, in which the vehicle body B is transferred from the hanger device to the lid device 28 at a position above the lifter device 28.

the lifter device 14.27, the undercoat device 5,
A floor conveyor 29 passes through a lifter device 28, an intermediate coating station 6, an intermediate coating drying unit 7, a top coating station 8, and a top coating drying unit 9, and the floor conveyor 29 is connected to each of the above-mentioned devices 14 and 27.
．． 5.28.6.7.8.9 to form an endless conveyor line. This floor conveyor 29 has substantially the same structure as the floor conveyor 15, and for convenience of explanation, the same members as those of the floor conveyor 15 in this floor conveyor 29 are designated by the symbol "'". In the configuration of this floor conveyor 29,
The difference from the structure of the floor conveyor 15 is that the cart 1
The mounting position of the support rod 20' of 7' is the support rod 20 of the truck 17.
The only difference is that the support rod 20' is attached at a position rearward (to the right in FIG. 3) of the support rod 20.
In this case, there is a relationship in which the vehicle body B is passed from the lifter device 14.28 to the bogie 17' at each lower position of the lifter device 14.28. There is a relationship in which the vehicle body B is transferred from the truck 17' to the lid device.

Next, the method according to the present invention will be explained.

First, when the vehicle body B is transported to the lifter device 11, the vehicle body B is held on the hanger device of the overhead conveyor 10 via the lifter device 111. The hanger device sequentially transports the vehicle body B to the surface treatment device 2 and the electrodeposition device 3, and an electrodeposited coating film is formed on the vehicle body B after the electrodeposition process.

The vehicle body B is transported to the lifter device 2212, and the vehicle body B is placed on the truck 17 via the lifter device 12.

The truck 17 transports the car body B to the electrodeposition drying device 4, where the electrodeposition coating film on the car body B is baked and dried. At this time, since the car body B is placed on the truck 17 immediately after finishing the electrodeposition process, the support rods of the truck 17, 2
In the supported portion P1 of the vehicle body B supported by the electrode 0, the electrodeposited coating film is not sufficiently dried and will peel off. In this state, the vehicle body B is conveyed to the lifter device 13, and the lifter device 13 is overloaded, allowing the hanger device of the conveyor 10 to hold the vehicle body B.

Hanger device beam lid of overhead conveyor 10
The vehicle body B is to be transported to the device 14, and the lifter device 14 places the vehicle body B on the cart 17' of the floor conveyor 29. At this time, since the position of the support rod 20' of the truck 17' is different from the position of the support rod 20 of the truck 17, the supported portion Pl' of the heavy body B supported by the truck 17' is 0 bogie 17', which is in a different position from the supported part P1 of the car body B supported by the bogie 17, transports the car body B to the lifter device 27, and the lifter device! ! 27 causes the hanger device of the overhead conveyor 26 to hold the vehicle body B.

Bunker device 4 for overhead conveyor 26 *Car body B
is transported to the undercoating device 5, and the vehicle body B
is undercoated. As a result, the parts of the vehicle body B where the paint film has been peeled off are also undercoated, and a paint film by the undercoat is also formed in those parts. The vehicle body B will be transported to the lifter device 28, and the lifter device 28t*car body B will be transferred to the cart 1 of the floor conveyor 29.
Place it again on 7'. At this time, the support rod 2 of the truck 17'
The supported part Pl' of the car body B supported by the electrode 0' is at the same position as the supported part of the car body B placed on the trolley 17' between the lifter device M14 and the lifter device 27. This is different from the supported portion P of the vehicle body B that is supported by the truck 17 in the drying process. Therefore, the support rod 20 of the bogie 17' is located on the part of the car body B where the electrodeposited film has peeled off and where only the undercoat film has been formed.
' will not come into contact with each other, and the force generated by placing the car body B on the truck 17' will not act on the weakest part of the coating layer.

This will prevent damage to the coating layer as much as possible.

In the above state, the car body B is transported by the trolley 17' to the intermediate coating station 6, the intermediate coating drying unit 7, the top coating unit 18, and the top coating drying unit 9, where it is processed according to each process and the painting process is completed. do.

Although the embodiments have been described above, the present invention includes the following aspects.

■The inner trolleys 17 and 17' of the floor conveyor 15.29 are the same, and the supported positions of the car body B are different.
7. Place the vehicle body B on 17'.

(2) The present invention is not limited to the painting process shown in the above embodiment, but any painting process may be used as long as it includes a plurality of processes in which the car body B is supported by a truck.

(3) The position of the support rod 21' should also be different for each process.

(4) The supported position of the vehicle body B is changed also in the intermediate coating process and the top coating process.

(Effects of the Invention) As described above, the present invention makes it possible to avoid applying the force generated by supporting the car body on a bogie to the weakest part of the coating layer of the car body. Damage to the coating layer at the supporting position can be prevented as much as possible.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a painting line according to the present invention, Fig. 2 is a plan view showing a floor conveyor used in the present invention, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a diagram showing other parts used in the present invention. Fig. 5 is a front view of Fig. fJS4. 1: Painting line 4: Electrodeposition drying device 6: Intermediate coating station 17.17': Cart B: Car body

Claims (1)

[Claims] (1) A method for transporting a car body in a painting line having a plurality of steps in which the car body is supported and transported by a trolley, the method comprising changing the supported position of the car body in each of the steps.