JP2000254725A - Cold rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect flaws on the surface of a steel strip in an early stage and to improve the yield of products by making the surface inspection of the steel strip in-line executable in cold rolling equipment which is provided with a twin- drum body type tension reel device as a coiling means for coils. SOLUTION: The twin-body type tension reel device 5 is installed on the underside of the rolling pass line of a cold rolling mill, a surface inspecting device 9 is installed on the extention on the downstream side of the pass line of the cold rolling mill which is passed through above the twin-body type tension reel device 5 and a pass switching device 20 for switching the pass of the steel strip 1 is installed on the outlet side of a flying shear 4. A strip 2 to be inspected which is cut out of the steel strip with the flying shear 4 is conveying to the surface inspecting device 9 by bypassing above the twin-body type tension reel device 5 and the surface inspection of the strip is excuted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold rolling plant, and more particularly to a cold rolling plant capable of performing in-line surface inspection of a steel sheet strip rolled by a cold rolling mill.

[0002]

2. Description of the Related Art In a cold rolling facility, a steel sheet strip continuously fed through a cold rolling mill is wound into a coil and transferred to a coil carrier by a coil car. As means for winding the steel sheet strip into a coil, for example, as described in "Hitachi Review", 1983, VOL. 65, page 23, a two-tension reel device or a twin-barrel type tension reel device (carousel reel device) is used. In order to make the equipment compact, the twin-barrel type tension reel device is more advantageous.

[0003] Here, the twin-barreled tension reel device is
In this method, two mandrels are supported by a vertically arranged rotating disk with a rotating shaft interposed therebetween, and coils are wound alternately around the two mandrels. The positions of the two mandrels are changed by rotating the disk, and move between a winding start position on the strip supply side and a coil discharging position on the opposite side. At the winding start position on the strip supply side, wind up the tip of the steel sheet strip sent out through the mill,
When the winding of the tip is completed, the disk is rotated by 180 ° to move the mandrel to the coil dispensing position,
At this position, further wind the coil around the mandrel,
When winding of one coil is completed, the coil is paid out from the mandrel using a coil car. While the mandrel is at the coil unloading position, the other mandrel waits at the winding start position, and after the winding of the coil onto the mandrel at the coil unloading position is completed, the mandrel at the winding start position transfers the next strip. Wind up the tip. Hereinafter, the above procedure is repeated.

[0004] In the above cold rolling equipment, it is necessary to inspect the surface of the steel sheet strip of the coil transferred to the coil conveying device in order to ensure the surface quality of the steel sheet strip. Conventionally, the surface inspection of a steel sheet strip has been performed by an offline (out-of-line) surface inspection device. For example,
The coil transferred to the coil transfer device by the coil car as described above is transferred to the inspection payoff reel by the inspection coil car, and the surface of the steel sheet strip unwound on the inspection table is inspected. After the inspection, the coil is rewound, transported to the coil transport device by the inspection coil car, and carried out to the storage yard or the next process line.

[0005] A surface inspection apparatus described in Japanese Patent Application Laid-Open No. 64-31955 is one that enables the surface inspection of a steel strip to be performed in-line without transporting the coil out of the line. This uses a two-tension reel device as a coil take-up means, and conveys the winding end of the coil of the strip taken up by the tension reel to the lower part of the tension reel to a length necessary for the surface inspection of the strip. This is provided with a conveyor extending a predetermined length in the line direction in which the strip is drawn.

[0006]

By the way, the scratch on the strip surface is mainly caused by the transfer of the scratch cut on the backup roll or the work roll of the cold rolling mill to the strip surface. Since this flaw appears intermittently at the same cycle as the outer peripheral length of the roll, it is used as a criterion for determining roll replacement.

[0007] Here, the damaged coil does not work as a product but is scrap. In the prior art, since the surface inspection is performed by an offline inspection device, the coil is taken up and transported to an inspection line, and when a defect is found on the surface, a coil of the next 3 to 5 coils is already taken up. Because of this, these few coils were wasted.

In the surface inspection apparatus described in Japanese Patent Application Laid-Open No. 64-31955, the surface inspection of the steel strip can be performed without transferring the coil to the outside of the line. it can.
However, this method is a method in which a coil is wound on a coil by a tension reel, and a strip of the coil is pulled out by a required length while the coil is supported on the tension reel, and the coil is wound around one mandrel. In a twin-barreled tension reel device that needs to immediately discharge the coil from the mandrel and move it to the winding start position after the completion of the winding, it is not possible to pull out the coil strip while supporting the coil on the mandrel after the winding is completed. Difficult and difficult to apply.

SUMMARY OF THE INVENTION The present invention has been devised in order to solve such disadvantages of the prior art, and an object thereof is to provide a twin-barreled tension reel device as a coil winding means, and to provide an in-line type. An object of the present invention is to provide a cold rolling facility capable of detecting scratches on the surface of a steel sheet strip at an early stage by improving the surface inspection of the steel sheet strip and improving the product yield.

[0010]

(1) In order to achieve the above object, the present invention provides a cold rolling mill and a running shear for cutting a steel strip continuously fed through the cold rolling mill. And a twin-roll type tension reel device for continuously winding the steel strip in a coil shape in this order in a cold rolling facility, wherein the double-roll type tension reel device is cold-rolled. It is assumed that a surface inspection device for inspecting the surface of the steel strip is disposed below the pass line of the mill and on the upstream and downstream sides of the pass line that passes above the twin-barrel tension reel device.

By installing the twin-barrel type tension reel unit below the rolling pass line of the rolling mill in this way, the length of the pass line of the cold rolling mill passing above the twin-barrel type tension reel unit can be extended. The surface inspection device can be arranged downstream, and the steel strip can be directly conveyed to the surface inspection device, bypassing the upper part of the twin-barreled tension reel device. This makes it possible to quickly inspect the surface of the steel strip while taking advantage of the twin-barreled tension reel device that allows the equipment to be compact, and to detect defects in the steel strip early, The yield can be improved.

(2) In the above (1), preferably,
The surface inspection device has means for sandwiching the inspection target strip cut out by the running shearing machine and inverting the front and back of the inspection target strip.

This makes it possible to easily and quickly inspect the front and back surfaces of the test strip.

(3) In the above (1), preferably, a path for switching the path of the steel sheet strip to one of the twin-barrel type tension reel device and the surface inspection device on the exit side of the traveling shearing machine. Switching means is arranged.

Thus, the path of the steel strip can be switched, the strip to be inspected can be transported to the surface inspection apparatus, and the surface inspection of the steel strip can be performed.

[0016]

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

FIG. 1 is a perspective view of a part of the continuous cold rolling equipment according to the present embodiment located downstream of the cold rolling mill, and FIG.
FIG. 3 is a side view of a downstream equipment portion including a cold rolling mill of the continuous rolling equipment, and FIG. 3 is a plan view of a downstream equipment portion of the continuous rolling equipment from the cold rolling mill.

The cold rolling equipment according to the present embodiment includes a cold rolling mill 30 including three or more stands shown in FIG.
In addition, on the downstream side, as shown in FIGS. 1 to 3, a running shear 4 for cutting the steel sheet strip 1 continuously fed from the cold rolling mill 30, and an outlet side of the running shear 4. A path switching device 20 for switching the path of the steel sheet strip 1 provided; and a twin-barreled tension reel disposed below a path line of a cold rolling mill 30 for continuously winding the steel sheet strip 1 in a coil shape. Device 5 and mandrel 6 or mandrel 6 of twin-barreled tension reel device 5
A belt wrapper 12 for winding the starting end of the steel sheet strip 1 around the sleeve 7 mounted on the sleeve 7, a coil car 8 for loading the coil 3 discharged from the twin-barreled tension reel device 5 and transporting the coil 3 to the transport device 13, Pinch roll 21 for holding or running test strip 2
A surface inspection device 9 for inspecting the surface of the test strip 2 and a shearing machine 10 for cutting the test strip 2
And a scrap cart 11 for storing the cut test strip 2 and transferring it to a disposal place.

The twin-body type tension reel device 5 supports two mandrels 6 with a rotating shaft interposed between rotating disks 5a arranged vertically, and inserts a sleeve 7 into the two mandrels 6 to alternately coil. It is configured to take up. The positions of the two mandrels 6 are changed by rotating the disk 5a, and move between a winding start position A on the strip supply side and a coil discharge position B on the opposite side. At the winding start position A on the strip supply side, the belt wrapper 12 is used to wind the leading end portion of the steel sheet strip 1 sent out through the cold rolling mill 30, and when the winding up of the leading end portion is completed, the disk 5a is rotated 180 degrees. (4) The mandrel 6 is rotated to move the coil to the coil dispensing position B. At this position, the coil is further wound around the mandrel 6, and when the winding of one coil is completed, the coil 3 is moved from the mandrel 6 using the coil car 8. Pay out. While the mandrel 6 is in the coil discharging position B, the other mandrel 6
Stands by at winding start position A, and coil unloading position B
After the coil has been wound onto the mandrel 6 at the winding start position A, the belt wrapper 12 is attached to the mandrel 6 at the winding start position A.
Use to wind the leading end of the next strip. Less than,
Repeat the above procedure.

The traveling rail 14 of the coil car 8 is installed in a direction orthogonal to the pass line of the steel strip 1, and a transport device 13 for transporting the coil 3 is connected to a terminal end thereof.

The running shear 4 is provided with a blade for cutting into a pair of upper and lower cylinders, and the steel strip 1 is cut when the upper and lower blades are engaged. By synchronizing the running speed of the steel sheet strip 1 with the speed at which the blades of the inter-shear shears 4 mesh with each other, cutting during the running of the steel sheet strip 1 is possible. Here, the traveling speed of the steel sheet strip 1 is about 60 m / min, and the inter-shearing shear 4 makes one revolution in about 10 seconds. Therefore, it is possible to divide the steel plate strip into the test strip 2 having a length of about 10 m. This 10
The length of about m is 2 to 3 of the circumference of the backup roll.
This is the amount of rotation, and is long enough to detect and judge a roll flaw during surface inspection.

The surface inspection device 9 is arranged on the extension of the pass line of the cold rolling mill 30 passing above the twin-barreled tension reel unit 5 and downstream of the twin-barreled tension reel unit 5. The starting end portion of the test strip 1 is divided into arbitrary lengths to be inspected by the inter-shearing shears 4 to obtain the strips 2 to be inspected. ,
It conveys to the surface inspection device 9 by bypassing the upper part of the twin-barrel type tension reel device 5.

A conventional twin-barreled tension reel device is usually arranged to wind a steel strip above a rolling pass of a rolling mill. In this arrangement, the steel strip is surface-inspected by bypassing the twin-barreled tension reel. It was difficult to transport to the equipment. Therefore, in the present invention, first, the twin-body type tension reel device 5 is installed below the rolling pass line of the cold rolling mill 30. By arranging the twin-body type tension reel device 5 in this manner, The surface inspection device 9 can be installed on the downstream extension of the pass line of the cold rolling mill 30 that has passed above the twin-body tension reel device 5, and the steel sheet strip can be directly transferred to the surface inspection device 9. Became possible. This makes it possible to quickly inspect the surface of a steel strip while taking advantage of the fact that the equipment of the twin-body tension reel device 5 can be made compact, and to find and take measures against defects in the steel strip early. Can be. In the conventional off-line surface inspection apparatus, sampling can be performed only for every 3 to 5 coils, but according to the present invention, sampling can be performed for each coil.

The inspection method in the surface inspection device 9 is performed by visually or touching the surface of the strip 2 to be inspected. Conventional off-line surface inspection equipment also performs inspection by visually or manually touching the surface of the steel strip, but in order to inspect the back surface, the steel strip unwound on the inspection table is manually inspected. There was no other way to turn it over. According to the present embodiment,
The surface inspection apparatus 9 has means for sandwiching the inspection strip 2 and inverting the front and back of the inspection strip 2, so that the front and back surface inspection can be performed more easily than in the past.

That is, the surface inspection device 9 has a plurality of openable and closable pinch rolls 9a sandwiching the strip to be inspected 2 cut out by the running shearing machine 4.
a is attached to the rotation support shaft 9b, and a table 9c is located on the opposite side of the rotation support shaft 9b,
By rotating the rotation support shaft 9b by 180 ° with the pinch roll 9a sandwiching the test strip 2 and holding the pinch roll 9a on the table, the front and back of the test strip 2 can be inverted.

Next, the operation of the facility will be described.

The starting end of the steel sheet strip 1 rolled by the cold rolling mill 30 is extracted to an arbitrary length to be inspected by the running shear 4 as a strip 2 to be inspected, and is arranged on the exit side of the running shear 4. The inspection table 9 is bypassed by the path switching device 20 by bypassing the upper part of the twin-body type tension reel device 5.
The surface is inspected on the inspection table 9. The surface inspection table 9 has a function of interposing the inspection target strip 2 and inverting the front and rear sides, thereby inspecting the front and back of the inspection target strip 2. After that he inspected the strip 2 with the shears 1
It is cut by 0, stored in the scrap cart 11, and transported to the post-disposal place. When a flaw is found by the surface inspection, it is immediately reflected in roll change or the like.

On the other hand, after the steel sheet strip 1 is extracted at the starting end as the strip 2 to be inspected, the path switching device 20
The path is switched, and the coil is wound in a coil shape in the twin-barrel type tension reel device 5, transferred to the transfer device 13 by the coil car 8, and then transferred to the coil storage location or the next step.

Next, the operation of the path switching will be described.

While the steel strip 1 is wound in the coil shape in the twin-barreled tension reel device 5, the path switching device 20 is raised upward. At the end of coil winding by the twin-body type tension reel device 5, the steel sheet strip 1 is cut by the running shearing machine 4, and the cut steel sheet strip 1 is wound by the twin-body type tension reel device 5 to complete one coil. I do. On the other hand, the starting end portion of the cut steel sheet strip 1 is sent above the twin-barreled tension reel device 5 because the path switching device 20 is raised. The steel sheet strip sent above the twin-barreled tension reel device 5 is held by the pinch roll 21 and sent further downstream. The steel sheet strip 1 is divided into strips to be inspected by a traveling shear 4 at an appropriate length. While the steel sheet strip 1 is fed above the twin-barreled tension reel device 5 and divided into the strips 2 to be inspected, the path switching device 20 descends downward. Immediately after being divided into the inspection strip 2 by the steel strip 1, the inspection strip 2 is fed by the pinch roll 21 at a speed approximately 15% faster than the running speed of the steel strip 1. Thereby, the interval between the dividing points of the steel strip 1 is increased, and it is possible to prevent the steel strip 1 from following the strip 2 to be inspected. Next, the starting end of the steel sheet strip 1 after cutting is sent to the twin-barrel type tension reel device 5 because the path switching device 20 is lowered, and is wound into a coil shape.

[0031]

According to the present invention, since the surface inspection equipment is arranged in-line, the steel sheet strip is conveyed to the inspection line immediately after rolling, and it is possible to detect the scratch on the surface of the steel sheet strip at an early stage. In addition, the amount of scrap products can be significantly reduced, and the yield can be greatly improved.

Also, a twin-barreled tension reel unit is provided as the coil winding means, and the surface inspection of the steel strip can be performed in-line, so that the equipment of the twin-barreled tension reel unit can be made compact. The above effects can be obtained while taking advantage of the above.

Further, compared with the conventional off-line surface inspection equipment, the inspection pay-off reel and the inspection coil car are not required, so that the equipment cost can be reduced, the equipment space can be reduced, and the number of parts can be reduced, thereby improving the maintainability. Is possible.

Also, the extracted steel strip is sandwiched on an inspection table, and the front and back are inverted, so that the front and back can be easily inspected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a portion of equipment downstream of a cold rolling mill of a cold rolling equipment according to an embodiment of the present invention.

FIG. 2 is a side view of a downstream equipment portion including a cold rolling mill of the cold rolling equipment shown in FIG.

FIG. 3 is a plan view of a portion of the cold rolling mill shown in FIG. 1 downstream of the cold rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate strip 2 Strip to be inspected 3 Coil 4 Shearing machine during running 5 Twin barrel type tension reel 6 Mandrel 7 Sleeve 8 Coil car 9 Inspection table 10 Shearing machine 11 Scrap cart 12 Bell trapper 13 Transport device 14 Running rail 20 Path switching device 21 Pinch Roll 30 Cold rolling mill

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G051 AA37 AB07 DA01 DA06 4E002 AD05 BD03 BD20 CB03 CB09 4E026 AA03 AA04 AA05 AA11 EA14 EA20

Claims (3)

[Claims] 1. A cold rolling mill, a running shear for cutting a steel strip continuously fed through the cold rolling mill, and a twin-body type tensioner for continuously winding the steel strip into a coil. In a cold rolling facility in which a reel device and a reel device are sequentially arranged on the same line in this order, the twin-barreled tension reel device is disposed below a pass line of the cold-rolling mill, and the twin-barreled tension reel device is provided. A surface inspection device for inspecting a surface of a steel strip at an upper and lower side of an extension of the pass line passing above the cold rolling equipment. 2. The cold rolling equipment according to claim 1, wherein the surface inspection device has means for sandwiching the inspected strip cut out by the running shear and inverting the front and back of the inspected strip. Cold rolling equipment. 3. The cold rolling equipment according to claim 1, wherein a path for switching a path of the steel strip to one of the twin-barrel type tension reel device and the surface inspection device is provided on an exit side of the traveling shearing machine. Cold rolling equipment, wherein switching means is arranged.