JP3460612B2 - Process line with surface defect meter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip process line, and more particularly to a strip process line including a surface defect meter.

[0002]

2. Description of the Related Art Cold-rolled steel strip is annealed, temper-rolled, side-trimmed, dimension-inspected, surface-inspected, and other predetermined inspections are conducted in a process line such as a continuous annealing line to form a coil. Wound up on the
It is sent to the process line of the subsequent process, or shipped to customers as a coil for external sales. Conventionally, the size has been inspected using an inspection device such as a plate thickness meter and a plate width meter, but the surface inspection has been performed by a visual inspection by an inspector.

In recent years, from the viewpoint of quality assurance, it has been required to perform an accurate surface inspection over the entire length of the coil, and in order to cope with this purpose, a surface defect meter is provided on the process line of the strip, and the surface defect is measured. The surface inspection of the strip is performed by reflecting the surface defect information of the strip detected by the meter on the visual inspection of the inspector on the output side.

The surface defect meter is installed in a place close to the take-up device on the outlet side so that the surface defects generated in the preceding step of the process line can be detected and the surface defects generated in the process line can be detected as much as possible. Has been done. Therefore, in a process line equipped with a temper rolling mill and a side trimmer device, the surface defect meter is installed on the downstream side of the temper rolling mill and the side trimmer device (for example, Japanese Patent Laid-Open No. Hei 3).
No. 118912, etc.).

[0005]

In the side trimmer device, oil is applied to the surface of the trimmer knife in order to prevent seizing of the trimmer knife during the trimming work and to prolong the life of the trimmer knife. May adhere to the edges. When oil adheres to the strip end, the surface defect meter installed on the downstream side of the side trimmer device
It becomes impossible to accurately determine the defect type and the degree of the defect with respect to the defect at the end of the strip. Therefore, there are cases where a coil including a defect that has been erroneously determined is shipped, or it is necessary to rework a coil that is suspected of being erroneously determined.

Even if the method of applying oil to the trimmer knife and the reduction of the amount of oil applied are examined, it is difficult to completely prevent the oil from adhering to the end of the strip. The judgment cannot be prevented, and conversely, the baking of the trimmer knife is increased and the life of the knife is shortened.

[0007] When the oil coating to the trimmer knife is stopped, the problem of erroneous determination of the strip end defect is eliminated, but the problem of trimmer knife baking becomes remarkable, and it is not an effective countermeasure.

In view of the above problems, it is an object of the present invention to provide a process line equipped with a surface defect meter capable of preventing erroneous determination of a strip end defect without shortening the life of a trimmer knife.

[0009]

Means of the present invention for solving the above-mentioned problems include a surface defect meter, a side trimmer device,
Arrangement of quality inspection equipment other than surface defect meter in this order
A process line, wherein (first invention), or <br/> was, temper rolling machine, surface defects meter, side trimmer device, the inspection device other than the surface defect meter that is disposed in this order Is a process line ( second invention).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an example of a process line according to an embodiment of the present invention, and is a diagram showing an arrangement of main equipment of a continuous annealing line for steel sheets. In FIG. 1, 1a and 1b are a rewinding device, 2 is a welding machine, 3 is a cleaning device, 4 is an entrance looper, 5 is a continuous annealing facility, 6 is an exit looper, 7 is a temper rolling mill, and 8 is a surface. Defect meter, 9 is a side trimmer device, 10 is a quality inspection device, 11 is an outgoing inspection unit,
Reference numeral 12 is an outlet side shear, and 13a and 13b are winding devices. As the quality inspection device 10, a quality inspection device other than a surface defect meter, for example, a plate width meter, a plate thickness meter, or a pinhole detector, an inclusion detector, an iron loss meter, etc. is appropriately installed as necessary. To be done.

The strip S unwound from the unwinding device 1a or 1b is connected to the preceding strip S by the welding machine 2, washed by the washing device 3 and subjected to the required heat treatment in the continuous annealing equipment 5 to be tempered. The strip is temper-rolled by a rolling mill 7, side-trimmed on both sides of the strip as needed by a side trimmer device 9, and quality inspection equipment 10 inspects qualities other than surface defects, such as plate thickness and plate width, and winds them. Device 13a
Alternatively, it is wound up at 13b, and when it reaches a predetermined weight, it is divided at the delivery side shears and delivered to the outside of the line. The temper rolling may be either wet rolling or dry rolling.

After the temper rolling of the strip S, the surface defect meter 8 detects defects. The surface defect meter 8 includes a detector and a signal processing unit, and the signal detected by the detector is processed by the signal processing unit to calculate a defect name, a defect grade, a defect length, and a width direction defect position. The defect information is tracked and displayed on the CRT 14 installed in the outgoing inspection section. The quality inspection device 10 inspects quality such as plate thickness and plate width other than surface defects,
When a quality abnormality is detected, an abnormality alarm is issued.

In the outgoing inspection section, an inspector performs a surface appearance inspection by running or stationary inspection. At this time, the defect information of the surface defect meter 8 displayed on the CRT is used, and necessary quality check such as dimension check is performed based on the abnormality alarm of the quality inspection device 10.

In the equipment of FIG. 1, a temper rolling mill 7, a surface defect meter 8, a side trimmer device 9, and a quality inspection device 10 other than the surface defect meter are arranged in this order in the running direction of the strip. Since the surface defect meter 8 is arranged upstream of the side trimmer device 9, even if the oil applied to the trimmer knife adheres to the end of the strip, it does not affect the defect determination of the surface defect meter 8. Since the edge defect can be accurately determined, it is possible to prevent the defect from being involved due to an erroneous determination and the re-inspection work of the coil suspected of being involved.

Generally, the surface defect meter 8 has a limitation that it cannot accurately detect a defect in the vicinity of the strip end. In the case of the conventional device in which the side trimmer device 9 and the surface defect meter 8 are arranged in this order, it is not possible to accurately detect the defect near the strip end portion after trimming. However, in the present invention, the surface defect meter 8 is used as the side trimmer device. Since the strip end portion before the trim is inspected by installing the strip end portion on the upstream side of 9, the defect near the strip end portion after the trim can be accurately detected. Further, the yield and quality can be improved by changing the trimming width based on the obtained defect data of the strip end.

Further, since the quality inspection device 10 such as the plate width meter is arranged downstream of the side trimmer device 9, the width abnormality can be surely detected even if the width abnormality is caused by the trimming failure.

The application of oil to the trimmer knife can be carried out by a usual method. Therefore, seizure of the trimmer knife does not occur, and there is no problem that the life of the trimmer knife is shortened. According to the method of the present invention, the life of the knife was extended by 1.5 times or more as compared with the case where the oiling to the trimmer knife was stopped.

In this process line, the temper rolling mill 7 is installed upstream of the surface defect meter 8. Since the surface of the strip whose surface has been smoothed by temper rolling is inspected,
The defect determination accuracy of the surface defect meter 8 becomes high. Further, since the strip shape is improved by temper rolling, it is possible to more accurately determine the end defect.

The process line of the first invention of the present invention is a quality inspection other than side trimming, surface inspection and surface inspection of a cold-rolled steel plate (including surface-treated steel plate and original plate for plating) conditioning line and surface treatment line. The present invention can be widely applied to a process line for simultaneously carrying out the above, and the process line of the second invention can be applied to a process line such as a hot dip galvanizing line.

[0020]

According to the present invention, since the surface defect meter is disposed upstream of the side trimmer device, even if the oil applied to the side trimmer knife adheres to the end of the strip, Since it does not affect the defect judgment of the defect meter,
The defect at the end of the strip can be accurately determined, and it is possible to prevent the defect from being caught due to an erroneous determination and the reinspection work of the coil suspected of being involved.

Since the quality inspection device for performing the plate width inspection and the like is arranged downstream of the side trimmer device, the width abnormality due to the trimming failure can be surely detected.

Since the oil can be applied to the trimmer knife of the side trimmer device by a usual method,
Since the seizure of the trimmer knife does not occur, the life of the trimmer knife is not shortened.

[Brief description of drawings]

FIG. 1 is an example of a process line according to an embodiment of the present invention, showing a layout of essential equipment of a continuous annealing line for steel sheets.

[Explanation of symbols]

1a, 1b Rewinding device 2 welding machine 3 cleaning equipment 4 Entry side looper 5 Continuous annealing equipment 6 Departure looper 7 Temper rolling mill 8 Surface defect meter 9 Side trimmer device 10 Quality inspection equipment 11 Outgoing inspection department 12 Delivery Shear 13a, 13b Winding device 14 CRT S steel plate

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-78702 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 1/00-1/46 B21B 15 / 00 G01N 21/89

Claims (2)

(57) [Claims] 1. A surface defect meter, a side trimmer device, and a surface.
The special feature is that quality inspection equipment other than the defect meter is installed in this order.
The process line to collect. 2. A process line comprising a temper rolling mill, a surface defect meter, a side trimmer device, and quality inspection equipment other than the surface defect meter in this order.