JPH0615052B2 - Automatic body color cast prevention system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic color cast prevention system for a vehicle body, and in particular, it automatically adjusts the color cast of the body by preparing a vehicle work line-up to be carried into an automobile body top coating process. The present invention relates to a prevention device.

[Prior Art] Body painting of car bodies in automobile factories is often done by painting different colors on the same line in each painting process, especially with the diversification of consumer preferences in recent years.
The types of paint colors on the vehicle body also tend to increase remarkably.

By the way, in general, the same gun is used for painting in the painting process, so if a dark (eg red or black) painted vehicle is continuously loaded with light (eg white) painted vehicles, the light color of the rear vehicle There is a problem in that the dark paint used for the former painting of the vehicle body adheres to cause so-called color cast, resulting in a vehicle with poor painting. In particular, the occurrence of such a color cast in the top coating process, which is an important process for giving the appearance and color feeling to the vehicle body surface and improving the commercial value, has been a serious defect.

Conventionally, the prevention of color cast in the top coating process of such an automobile is performed by a worker who is in the pre-process of the top coating process, generally a water-polishing process, by using a color code provided on the vehicle body that flows through the water-polishing process. Judgment, set a pin only on the dark-colored vehicle, put it into the bypass line attached to the previous process of the top-coating process with that pin as a mark, and the operator of the top-coating process is the last vehicle in the top-coating process. While watching the color, the dark-colored vehicle on the bypass line was appropriately put into the top-coating process so that the light-colored vehicle did not immediately follow the dark-colored vehicle, and the color cast was prevented.

However, in such a conventional artificial method, in addition to the possibility of making a judgment error, the number of new work steps such as the above-described pin stand and selection of a vehicle to be put into the top coating process increases. was there.

Also, if the operator carelessly forgets to put the vehicle in the bypass line into the topcoat painting process, the opportunity to put it will be lost, and in the worst case when the vehicle is full in the bypass line There was a problem that the line stopped and the work of the previous process was interrupted.

OBJECT OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the related art, and an object thereof is to automatically adjust the alignment of vehicle workpieces in the preceding step of the overcoating step and to automatically insert the vehicle work into the overcoating step. An object of the present invention is to provide an automatic color cast prevention system for a vehicle body capable of preventing color cast of the vehicle body without human intervention.

[Means for Solving the Problems] In order to achieve the above object, the present invention adjusts the arrangement of vehicle works by providing a plurality of work reorganization lines between the top coating process of the vehicle body and the preceding process. In a system for preventing color cast of a vehicle body in a top coating process, identification information input means for detecting identification information of a vehicle work carried in and out of each process and line, and carried out from the previous process based on predetermined conditions The reorganization line into which the vehicle work is carried in and the vehicle work to be put into the top coating process from each knitting line are instructed, and the vehicle work arrangement data in each reorganization line is created based on the identification information and An arithmetic processing unit that writes and stores identification information and conditions; a line control panel that controls each process and line based on a command from the arithmetic processing unit; And a condition input device for setting conditions for the type of vehicle work to be put into each reorganization line and the condition of the arrangement of vehicle work in which color cast occurs, and prevent color cast of the vehicle body in the top coating process. And

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of an automatic color cast prevention system for a vehicle body according to the present invention and its relationship with a production line. In the figure, a vehicle work reorganization line consisting of a main line and a bypass line 13 is arranged in parallel between the top coating process 14 on the production line 100 and the preceding process 10 (generally, a water polishing process). , A plurality of types of vehicle work 20a to 20
k flows, and a predetermined painting operation is performed in each of the steps 10 and 14. In the present embodiment, the reorganization lines 12, 13
Is a line for adjusting the arrangement of vehicle works, and no actual painting work is performed on this reorganization line. 15 and 17 carry in the work carried out from the previous step 10 into the bypass line 13, and the bypass line 1
A traverser for transporting from 3 to the top coating process 14, which is driven by drive units 16 and 17, respectively.

Identification information sensors 22 for detecting the identification information of the workpieces carried out from the previous process 10 are provided near the vehicle work loading entrances of the reorganization lines 12, 13, and limit switches 24, 26 are provided near the loading exits thereof, respectively. A limit switch 28 is installed at the carry-in entrance of the top coating process 14. The internal configuration of the identification information sensor and each limit switch is connected to the arithmetic processing unit 30 shown in FIG. The arithmetic processing unit 30 is provided corresponding to the identification information sensor 22 and each of the limit switches 24, 26 and 28, and inputs the signals 36, 38, 40 and 42 from these sensors and each of the limit switches, respectively. , 54, and a central processing unit 60 for processing a signal acquired through each input unit according to a predetermined program. Also, the input unit 56 is for each reorganization line 1
Each condition setting signal input from the condition input device 34 for designating the type of the work to be carried in 2 and 13 and for inputting the condition of the arrangement of the work in which the color cast occurs in the top coating process 14, It is output to the processing unit 60 and the storage unit 62. In the storage unit 62, various conditions from the condition input device 34 and identification information of each work processed by the central processing unit 60 are written and stored at predetermined addresses. A command signal 44 based on the calculation result of the central processing unit 60 is output from the output unit 58 of the arithmetic processing unit 30 to the line control board 32, and the line control board 32 outputs each process and line on the production line 100. Then, the drive units 16 and 18 of the traversers 15 and 17 which connect the respective processes to the bypass line are controlled in accordance with the command signal 44.

The arithmetic processing device can be easily configured by using a microcomputer or the like.

The automatic color cast prevention system according to this embodiment has the above-described configuration, and its operation will be described below.

Normally, the body paint colors are classified into three types: dark colors (eg red or black), light colors (white or pearl white), and intermediate colors (eg silver metallic, gray, etc.), but color fog occurs in the top coating process. As described above, only the case where the light-colored vehicles are immediately followed by the light-colored vehicles is performed. In other words, the color cast of the vehicle body does not occur except for the dark-light vehicle arrangement. Therefore, the neutral color vehicle is not a direct cause of the color cast regardless of the position of both the dark color vehicle and the light color vehicle.

In FIG. 1, vehicles 20a to 20c are provided in the pre-process 10 on the production line 100, vehicles 20e are provided in the main line 12,
20f, vehicles 20g to 20i on the bypass line 13,
In the top coating process 14, 20j and 20k vehicle works are respectively flowing. Now, when the work 20d is carried out from the previous step 10, the identification information of the work, that is, the color code (D) is detected by the identification information sensor 22, and the identification information is directed to the arithmetic processing device 30 as the identification information signal 36. Is output. The arithmetic processing unit 30 takes in the identification information from its input unit 48, and this identification information is output to the central processing unit 60.

As the identification information sensor 22, in addition to such a device that optically and automatically reads a color code, a device that reads a work number and then takes the color code from a master computer that controls the production line itself is also used. It is possible.
The arithmetic processing circuit 30 takes in the identification information from the input unit 48, and the arithmetic processing information is stored in the storage unit 62 by the central processing unit 60.
By referring to the designated color of the vehicle work for each of the three, the reorganization line to carry in the vehicle work 20d is determined and instructed. That is, in the embodiment, the identification information of the vehicle work 20d, that is, the color code is D, while the designated color of the main line 12 is "other than A and C" in the "designated color" section in the storage unit 62, and the bypass. The work designated color of the line 13 is set as "A, C". Therefore, the work 20d
The reorganization line to be brought in is the main line 12,
The central processing unit 60 outputs this instruction to the line control board 32 via the output unit 58. The line control board 32 controls the line based on the signal from the central processing unit 60 to bring the vehicle 20d into the main reorganization line 12.

The work carried out from the previous process 10 by such a procedure is branched and carried into one of the two lines of the reorganization lines 12 and 13, but in the present embodiment, the main line 12 has a light color and It is configured such that a medium-colored work and a dark-colored work are carried into the bypass line 13.

In this way, the vehicle work carried out from the previous step 10 is classified into dark-colored work, light-colored work, and intermediate-colored work, and then the vehicle work in the reorganization lines 12 and 13 is put into the top coating process 14. The operation will be described.

The vehicle works carried into the reorganization lines 12 and 13 move serially in these lines, and when approaching the carry-out port, they come into contact with the limit switches 24 and 26 provided a predetermined distance before the carry-out port. Then, the limit switches 24 and 26 generate predetermined detection signals 38 and 40, and these signals are input to the arithmetic processing unit 30 via the input unit 5 thereof.
It is taken in via 0, 52. The central processing unit 60 recognizes that the vehicle has reached the carry-out exit of the reorganization lines 12 and 13 based on the signals 38 and 40, and should input the vehicle work, 20f and 20i in the embodiment, to the top coating process 14. The target vehicle is registered in the "color code arrangement" section in the storage unit 62.

Further, when the vehicle work put into the top coating process 14 comes into contact with the limit switch 28 provided in the vicinity of the carry-in port of the process 14 in the order to be described later, the detection signal 42 thereof is input to the input unit 54 of the arithmetic processing unit 30. It is taken into the central processing unit 60 via the. The central processing unit 60 recognizes from this signal that the vehicle work carried out from the reorganization lines 12 and 13 has been put into the top coating process 14, and the color code thereof is stored in the "entrance of the top coating process 14" in the storage unit 62. Register in the section "Vehicle color".

Vehicles located at the exit of the reorganization lines 12 and 13 in the above order, that is, 20f and 20i that are vehicle workpieces that are input to the top coating step 14, and the latest vehicle workpiece that has been input to the top coating step 14, that is, step 14 This means that the vehicle work located at the entrance of the vehicle, 20j in the illustrated example, has been grasped by the central processing unit 60.

The central processing unit 60 compares the color codes of these vehicle works with preset color cast conditions in the storage unit 62, and determines which of the loading target vehicles 20f and 20i is to be loaded.

That is, in FIG. 1, as is clear from the item “color cast condition” in the storage unit 62, the combination of the color codes of the vehicle work in which the color cast occurs in the overcoating step 14 is immediately after the color code A. Color code D or color code C
It is set that the vehicle work of the color code D continues immediately after. From this, it can be seen that the color codes A and C represent dark colors, D represents light colors, and B represents intermediate colors.

On the other hand, the vehicle 20j located at the entrance of the top coating process 14
The color code of A is A, and therefore, if a vehicle with a color code D is introduced immediately after this vehicle 20j, color cast will occur. In other words, if the color code of the vehicle following the vehicle 20j is other than D, color cast does not occur, and it means that the color code can be applied to the overcoating step 14 regardless of the type of color code.

Here, the color codes of the target vehicles 20f and 20i are B and A, respectively, and even if the color codes are A immediately after the last vehicle work 20j of the top coating process 14 having the color code A, color cast occurs. do not do. Therefore, in this case, either of the target vehicle works 20f, 20i may be introduced, but in such a case, the stock numbers of the vehicle works in both reorganization lines 12, 13 are adjusted uniformly. In order to do so, we will start with the one with the most stock. Therefore, in the first state in which the vehicle work 20d has not yet been brought into the reorganization line, the number of stocks in the main line 12 is two, and the number of stocks in the bypass line 13 is three. The vehicle work 20i is put into the process 14.

Due to the relationship of the designated colors of the re-arrangement lines 12 and 13 in this embodiment, when a dark-colored vehicle is introduced from the bypass line, in order to be introduced from the main line 12 next, The color should be neutral.

When the vehicle work to be put into the top coating process 14 is determined in this manner, the central processing unit 60 outputs the input instruction signal to the line control board 32 via the output section 58, and the line control board 32 outputs this signal. Traverser 1 based on
The drive unit 18 of No. 7 is controlled, and the vehicle 20 i on the side of the bypass line 13 is put into the topcoat painting step 14. When the vehicle is newly introduced into the top coating process 14, the central processing unit 60 updates the arrangement of the vehicle works in the reorganization lines 12 and 13 and the color code of the work of the last vehicle in the top coating process 14. Then, it is registered again in the storage unit 62 at a predetermined address.

It is understood that the above operation is repeated every time the vehicle work is carried in and out of each process and line, and that the vehicle is always carried into the overcoating process 14 with a combination of color codes that does not cause color cast.

In this way, according to the present embodiment, without any artificial work, since the color code arrangement of the vehicle work carried into the overcoat painting process is adjusted and carried into the overcoat painting process, Extremely efficient and reliable prevention of color cast on the vehicle body.

[Effects of the Invention] As described above, according to the present invention, it is possible to automatically prevent color cast in the top coating process of a vehicle work without human intervention, so each work on the line is extremely efficient. In addition to being able to proceed smoothly, it is possible to reliably prevent the congestion of vehicles in the process due to forgetting to put it in, so that the line does not stop.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an automatic color cast prevention system according to the present invention, and FIG. 2 is a block diagram showing the internal configuration of the arithmetic processing unit in FIG. 10 …… Previous process 12, 13 …… Reorganization line 14 …… Overcoat painting process 22 …… Identification information sensor 30 …… Calculation processing device 32 …… Line control panel 34 …… Condition input device 60 …… Central processing unit 62 ...... Memory section

Claims (1)

[Claims] 1. A system for preventing a color cast of a vehicle body in the above-mentioned topcoating step by providing a plurality of work reorganization lines between a topcoating step of the vehicle body and a preceding step thereof to adjust the arrangement of vehicle works. Identification information input means for detecting identification information of vehicle work carried in and out of each process and line, reorganization line into which the vehicle work carried out from the previous process is carried in based on predetermined conditions, and top coating from each knitting line An arithmetic processing unit for designating a vehicle work to be put into the painting process, creating vehicle work arrangement data in each reorganization line based on the identification information, and writing and storing the identification information and conditions, and the operation. A line control panel that controls each process and line based on a command from the processing device, and a type of vehicle work and a color cover to be put into each reorganization line. A system for automatically preventing color cast of a vehicle body, comprising: a condition input device for setting a condition of a row of vehicle work that causes a color shift, and preventing color cast of the vehicle body in a top coating process.