JP2000051938A - Stop mark display device for thin steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which displays existence of a stop mark on a thin steel sheet surface for informing an user. SOLUTION: A line stop detection means 17 detects line stop from the fact that the pulse from a pulse generator 15 is not inputted for a fixed time. A tracking means 18, when line stop generation is inputted from the line stop detection means 17, writes in a stop mark signal to a shift register corresponding to a position of a leveler 8. The tracking means 18 successively shifts the information in the shift register corresponding to the pulse from the pulse generator 15. Further, when a written in stop mark signal reaches the shift register corresponding to a position of the marking device, a marking command means 19, based on the command, issues the command to conduct marking corresponding to the stop mark to the marking device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for displaying, on the surface of a thin steel sheet, the presence of a stop mark generated on a skin pass line or a refinement line having a leveler of the thin steel sheet.

[0002]

2. Description of the Related Art In the manufacturing process of thin steel sheets, a skin pass mill is generally used to prevent the occurrence of breaks in the back and stretchers and strains, to provide necessary mechanical properties, and to improve the shape of the thin steel sheets. Light cold rolling of about 0.5 to 4% is performed. Also, in the recoil line, which is the final manufacturing process, an operation for improving the shape of the thin steel sheet is performed by a leveler.

FIG. 2 shows a schematic diagram of a typical recoil line. In FIG. 2, 1 is a thin steel plate, 2 is an uncoiler,
3 is a pinch roll, 4 is a thickness gauge, 5 is a shear, 6 is a side trimmer, 7 is a welding machine, 8 is a leveler, 9 is a surface defect detector, 10 is an oiler, 11 is a marking device, 12 is a shear, 13 is The deflector roll 14 is a tension reel.

[0004] The thin steel sheet 1 wound in a coil shape is unwound by an uncoiler 2, passes through a pinch roll 3, and is measured in thickness by a thickness gauge 5. The defective portion at the front and rear ends of the thin steel plate 1 is cut and removed by the shear 5. Thereafter, the thin steel plate 1 is trimmed to a specified width by the side trimmer 6.
The welding machine 7 is used when two or more coils are connected to form one large coil. The thin steel sheet 1 that has passed through the side trimmer 6 is corrected in shape by a leveler 8, inspected for surface defects by a surface defect detector 9, and then coated with rust-preventive oil by an oiler 12. When a surface defect is detected by the surface defect detector 9, the marking device 11 performs marking at a corresponding position on the thin steel plate 1. The shear 12 is for cutting and removing a defective portion.
The thin steel sheet 1 that has passed through these series of facilities is wound up by a tension reel 14 through a deflector roll 13 to form a product coil.

[0005]

During operation in such a recoil line, a situation arises in which the leveler 8 must be stopped due to an abnormality in the equipment, cutting of a defective coil portion, or the like. Then, a defect called a stop mark occurs in the portion of the thin steel plate 1 existing inside the leveler 8 at that time. This defect is a very harmful defect particularly when used as an outer panel of an automobile. Therefore, it is necessary to allow the user to detect a portion where the defect exists. A similar stop mark is generated not only when the steel plate is stopped during the rolling in the skin pass mill but also in the leveler. However, in the related art, a method of displaying the presence of the stop mark and notifying the user has not been developed.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a device for displaying the presence of a stop mark on the surface of a thin steel plate to notify a user.

[0007]

An object of the present invention is to provide an apparatus for displaying the presence of a stop mark generated on a refinement line having a skin pass line or a leveler of a thin steel sheet on the surface of the thin steel sheet, and detecting the stop of the line. Means, a marking device that performs marking on the surface of the thin steel plate, and detects and tracks the thin steel plate portion that was located in the skin pass or the leveler when the line was stopped, and when the portion passes the position of the marking device, And a control device for operating the marking device.

In this means, the stop of the line is detected, the thin steel plate portion located in the skin pass or the leveler at the time of the stop of the line is detected and tracked, and when the portion reaches the position of the marking device, it is detected. The marking is performed on the relevant portion. Therefore, the part where the stop mark exists can be notified to the user by the mark provided on the surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of an embodiment of the present invention. FIG. 1 shows a recoil line,
Is a thin steel plate, 2 is an uncoiler, 3 is a pinch roll, 4 is a thickness gauge, 5 is a shear, 6 is a side trimmer, 7 is a welding machine, 8
Is a leveler, 9 is a surface defect detector, 10 is an oiler, 11 is a marking device, 12 is a shear, 13 is a deflector roll, 14 is a tension reel, 15 is a pulse generator, 16 is a control device, 17 is a line stop detecting means, 18
Is a tracking means, and 19 is a marking command means.

The thin steel sheet 1 wound in a coil shape is unwound by an uncoiler 2, passes through a pinch roll 3, and is measured in thickness by a thickness gauge 5. The defective portion at the front and rear ends of the thin steel plate 1 is cut and removed by the shear 5. Thereafter, the thin steel plate 1 is trimmed to a specified width by the side trimmer 6.
The welding machine 7 is used when two or more coils are connected to form one large coil. The thin steel sheet 1 that has passed through the side trimmer 6 is corrected in shape by a leveler 8, inspected for surface defects by a surface defect detector 9, and then coated with rust-preventive oil by an oiler 12. When a surface defect is detected by the surface defect detector 9, the marking device 11 performs marking at a corresponding position on the thin steel plate 1. The shear 12 is for cutting and removing a defective portion.
The thin steel sheet 1 that has passed through a series of these facilities is taken up by a tension reel 14 through a deflector roll 13 to form a product coil. This operation is the same as the prior art.

In the present embodiment, a pulse generator 15 is coupled to one roller (actually, a roller driving motor) of the leveler 8, and its output is
6 has been entered. The control device 16 is mainly composed of a microcomputer, and has a line speed detecting means 17,
It has a tracking means 18 and a marking command means 19, the main parts of which are constituted by software.

The line stop detecting means 17 detects the occurrence of a line stop because a pulse from the pulse generator 15 is not input for a predetermined time. Tracking means 1
Reference numeral 8 denotes a shift register corresponding to a recoil line length direction position (comprising a microcomputer memory).
When the occurrence of a line stop is input from the line stop detecting means 17, a stop mark signal is written into a shift register corresponding to the position of the leveler 8.

When the driving of the line is resumed and a pulse is input from the pulse generator 15, the tracking means 18 sequentially shifts information in the shift register in accordance with the pulse. Then, when the written stop mark signal reaches the shift register corresponding to the position of the marking device 11, a command is issued from the tracking means 18 to the marking command means 19. The marking command means 19 outputs the marking device 11 based on this command.
Then, a command for performing marking corresponding to the stop mark is issued. The marking device 11 puts a mark corresponding to the stop mark on the surface of the thin steel plate 1 in response to this command.

In the recoil line where the surface defect detector 9 is installed, a defect detected by the surface defect detector 9 is tracked and marking is performed by the marking device 11. have. Therefore, in the control device 16, this part is shared with the surface defect detection / marking system (however, it is necessary to extend the tracking range to the leveler 8 position), only the line stop detection means 17 is newly provided, and the stop is performed. The mark may be regarded as one surface defect signal and input to the surface defect detection / marking system. In this way, the number of new facilities can be significantly reduced.

Although the above embodiment has been described with reference to the recoil line, the stop mark can be marked on the skin pass line by providing similar equipment. In this case, the pulse generator utilizes what is connected to the mill motor. However, since a surface defect detection / marking system is not generally provided in the skin pass line, it is necessary to newly provide an entire apparatus for marking a stop mark.

[0016]

As described above, according to the present invention, there are provided means for detecting the stop of a line, a marking device for marking the surface of a thin steel sheet, and a thin steel sheet which is located in a skin pass or a leveler when the line is stopped. When detecting and tracking a part, and when the part passes through the position of the marking device, the control device that activates the marking device is provided. It is possible to accurately inform the user of the location of the stop mark.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a conventional recoil line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thin steel plate 2 ... Uncoiler 3 ... Pinch roll 4 ... Thickness gauge 5 ... Shear 6 ... Side trimmer 7 ... Welding machine 8 ... Leveler 9 ... Surface defect detector 10 ... Oiler 11 ... Marking device 12 ... Shear 13 ... Deflector roll 14 ... tension reel 15 ... pulse generator 16 ... control device 17 ... line stop detection means 18 ... tracking means 19 ... marking command means

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Takagi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 2G051 AA37 AB02 AB20 DA15

Claims (1)

[Claims] 1. A device for displaying the presence of a stop mark generated in a refinement line having a skin pass line or a leveler of a thin steel sheet on a surface of the thin steel sheet, a means for detecting stop of the line, and marking on the surface of the thin steel sheet. Marking device to apply, and detect and track the thin steel plate portion that was located in the skin pass or leveler when the line was stopped,
When the part passes through the position of the marking device,
And a control device for operating the marking device.