JPS6243901B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetically identifiable vehicle body that has an improved display method for displaying the serial number of the vehicle body, the type of vehicle, and the like.

Conventionally, automobiles are made up of several thousand parts, and each part is assembled in a synchronized order with a belt conveyor to improve efficiency. Therefore, in each assembly process, workers decide which parts to install on which car model by following the instructions for parts to be installed, which are output from a hand reader or computer, to prevent confusion caused by incorrect assembly and to improve efficiency. It's on.

However, in the car body manufacturing process, thin steel plates are pressed and each part is spot welded to complete the body, but the next step is painting.

In the painting process, various car models are mixed together, washed with water, treated with resin, preheated and dried, and dried. Therefore, it is necessary to identify the vehicle model in the order before and after the painting process, and the vehicle model code on the vehicle body serves as the basic number for assembling the interior, engine installation, etc.

However, as mentioned above, in the painting process, chemical (e.g. Triclean degreasing) and temperature (e.g. 130 to 180
℃ drying) Due to the stress-adding process, cards used at room temperature cannot be used, and workers rely on visual judgment, and car numbers are engraved by comparing them visually with a list of car types in the paint flow, but conventionally only occasionally. There have been cases of process confusion due to mistakes, and measures to prevent this have been desired.

In order to prevent such human errors, the purpose of the present invention is to propose a magnetic identification method that magnetically records the car model symbol directly on a part of the car body, such as the roof, and allows accurate identification of the car model even before and after the painting process. It's about doing.

An embodiment of the present invention will be described below.

FIG. 1 shows the body structure of an automobile.

The vehicle body 1 is based on a frame body 2, and includes a roof 3, a front plate 4, a bonnet plate 5, and a door plate 6 (6-1, 6).
-2), glass plate 8 (8-1, 8-4) and wheel 7
(7-1, 7-2).

Fig. 2 shows the state in which the car body 1 is being transported on the belt conveyor 9, and the work on the car body is completed at point After the painting process is completed, the data such as the vehicle type stored in the car body 1 is read out at point Y, and then distributed to each assembly line process from point Z onwards.

In the present invention, at point X, the control unit 15 decodes the data based on the command from the host computer 17, and part of it passes through the magnetization bias circuit 11 and then the magnetization head 10 moves the location where the magnetic memory is to be stored (roof 3 in this figure) in a certain direction. When the vehicle body 1 comes to the position of the writing head 12 as the belt conveyor 9 moves, the controller 15
A degaussing bit command is applied to the write head 12 via the write/read circuit 14. Then, when the vehicle body 1 is further moved on the belt conveyor, the read head 13-1 confirms that the written data has been correctly stored.

Thus, after painting is completed, read head 1 is read out at point Y.
3-2 reads the stored data and sends the information to the host computer 17 via the data transfer circuit 16, completes the work processing before and after the painting process of the car body 1, and sends instructions for the next assembly process from the host computer 17 as usual. Communicate using the following system.

FIG. 3 illustrates the above situation using magnetic characteristics. The horizontal axis represents the time during which the belt conveyor 9 moves, and the vertical axis represents the magnetizing force.

Now, at point X, the residual magnetic flux in car body 1 is 0.4 to 1.5.
Gauss remains and becomes a back noise signal source.
The reasons for the generation of residual magnetic flux are due to the electromagnetic chuck during loading and unloading of the plate material, due to processing strain during press working, and a composite value of geomagnetism.

To accurately write magnetic data, bias the magnetized head 10 of the present invention toward the stronger side (the side 3), which is undesirable because of residual magnetism.
is applied to uniformly form a unidirectional magnetization _G1 . The strength of magnetization _{G 1} may be approximately 20 to 50 Gauss.

When part of this magnetization G ₁ is demagnetized by magnetizing the bit value to be stored by the write head 12 in the demagnetization direction, the difference between the magnetization G ₁ and the demagnetization becomes clear, and the demagnetization bit information can be read out. Head 13
-1 sets the threshold level to L ₁ -L ₂
If it is, the output will be P ₁ - P ₂ , ``0'' and ``1''.
The pulse is shaped and can be decoded using binary notation. Further Y
In the read-only portion at point, a similar binary bit signal is also obtained by read head 13-2.

FIG. 4 explains the arrangement of these bit information using the roof 3 as an example, and shows that the magnetized head 10 is larger than the width of the multi-channel of the write head 12 and the read head 13.

The reason for the multiple channels of the write head 12 is that when writing data in BCD code, four channels are required, and the timing bits and parity check bits add up to b channels. Of course,
The position of the read head 13 must be in the same arrangement as the six channels of the write section.

Furthermore, if the magnetizing head 10 is made larger than the individual widths of each of the six channels, it is not necessary to perform integral magnetization as shown in FIG.

In the above explanation, an example of application was explained to the roof 3 of the car body 1, but it may also be applied to both side surfaces of the car body 1. In short, by devising a suspension system that matches the flow of the belt conveyor, it can be applied to any part of the car body 1. The present method is similarly applicable.

As described above, according to the present invention, it is possible to write and read production control information such as the vehicle model number directly to and from the vehicle body even under harsh chemical and temperature conditions during the vehicle body painting process, and the unidirectional bias By employing magnetization, it is possible to ignore residual magnetic flux, provide a highly sensitive and accurate magnetic identification method, and prevent human error.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an automobile shown as an embodiment of the present invention, FIG. 2 is a block diagram of a magnetic identification device of the present invention, FIG. 3 is an explanatory diagram of the relationship between magnetizing force and conveyor flow time, and FIG. FIG. 4 is a plan view of the arrangement of each head. DESCRIPTION OF SYMBOLS 1...Car body, 10...Magnetizing head, 12...Writing head, 13...Reading head.

Claims (1)

[Claims] 1. In a method of writing magnetic information on an automobile body using a magnetic writing section, detecting this magnetic information using a magnetic reading section, and identifying the magnetic information, before writing the magnetic information on the automobile body, unidirectional magnetization is performed. 1. A method for magnetic identification of an automobile body, characterized in that after forming, a part of the magnetization is demagnetized in a magnetic writing section to obtain magnetic writing information.