JPH11138203A - Continuous rolling method and continuous rolling equipment for executing this method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous rolling method for shortening a strip to be stored to join the trailing edge of a preceding strip to the leading edge of the succeeding strip and to provide continuous rolling equipment. SOLUTION: This equipment consists of one or plural rolling mills 1 for cold-rolling the strip, an un-coiler 4 provided on the inlet side of the rolling mills 1, a joining machine 5 for joining the trailing edge of the preceding strip to the leading edge of the succeeding strip, a dancer roll 6 and inlet-side tension generating device 7 for storing the strip which is fed during joining, an outlet- side tension generating device 8 arranged on the outlet side of the rolling mills 1, a cutting machine 9 for cutting the strip and a coiler 10 and an automatic gage controller not shown in the figure is a provided on the rolling mills 1. Using the continuous rolling equipment the bearings for the back-up rolls 3a, 3b of which are roller bearings, in the state that the automatic gage controller is operated, rolling is executed by decelerating the rolling mill during joining the trailing edge of the preceding strip to the leading edge of the succeeding strip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous rolling method for rolling while joining a trailing end of a preceding strip and a leading end of a succeeding strip, and a continuous rolling facility for implementing the method.

[0002]

2. Description of the Related Art Conventionally, as a rolling method and equipment for continuously performing cold rolling, as shown in FIG. 2, uncoilers 4a and 4b, a shearing machine 12, and a strip after a preceding strip are provided on the entry side of a five-stand rolling mill 1. A welding machine 17 for welding the end and the leading end of the following strip, a strip storage device 13 for accumulating the strip 11 supplied during welding, and the like are arranged. Machine 15, the coilers 10a, 10b, etc. are arranged, the leading strip is rolled, and when the trailing end of the leading strip comes to the shearing machine 12, the feeding of the trailing end is stopped and the trailing end is moved by the shearing machine 12. Cut, rewind the following strip, stop when the tip of the following strip comes to the welding machine 17 and cut the tip with the shearing machine 12,
When it reaches the welding machine 17, the traveling of the trailing end of the preceding strip and the leading end of the following strip are stopped, and the trailing end of the preceding strip and the leading end of the following strip are welded by the welding machine 17,
A method and an apparatus for continuously performing cold rolling by supplying the strip from the strip storage device 13 to the rolling mill 1 when the trailing end of the preceding strip stops running are disclosed in Japanese Patent Application Laid-Open No. 25350/1990. Have been.

[0003] Further, as shown in Fig. 3, a running shearing machine 15, a winding / rewinding machine 16,
Shearing machine 12, welding machine 17 for welding the trailing end of the leading strip and the leading end of the trailing strip, strip storage device 1
3. Arrange the bridle rolls 7 and the like, arrange the bridle rolls 8 on the exit side of the rolling mill 1, and strip the bridle rolls 8 from the exit of the bridle rolls 8 to the traveling shearing machine 15 on the entrance side.
When the trailing end of the preceding strip comes to the shearing machine 12, stop feeding the leading strip and shear the trailing edge, and the leading end of the succeeding strip comes to the shearing machine 12. When the feed is stopped and the tip is sheared, when the trailing end of the preceding strip and the tip of the following strip come to the welding machine 17, the delivery of both is stopped and welding is performed, and then the leading strip is rolled. When the welded end of the rear end comes to the traveling shearing machine 15, it is sheared during the traveling, the winding and rewinding machine 16 finishes the winding, and the leading end of the following strip is wound and wound again. The rewinding machine 16 starts winding. If the coil of the strip 11 having been wound is thicker than a predetermined thickness, the above steps are repeated until the coil has a predetermined thickness, and if it is not necessary to perform rolling again, it is taken out by a coil car and rolled again. Coil winding / rewinding machine
The above publication discloses a method and an apparatus for performing endless cold rolling in such a manner that the material is supplied to a roll 16 and rolled.

[0004]

However, in the conventional continuous cold rolling method and apparatus described above, since the cold rolling speed is not reduced even during welding, the cold rolling speed is accumulated in the strip storage device 13. The length is very long, i.e. the cold rolling speed is about 600-800 m / min and the time required for welding is about 1 minute 30 seconds, so it needs to be at least about 900 m, A large strip storage device was required. SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous rolling method and a continuous rolling equipment capable of shortening a accumulated strip for joining a trailing end of a preceding strip and a leading end of a succeeding strip.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventor studied shortening the length of accumulating strips in a continuous rolling method. In order to reduce the strip speed on the entry side, it is necessary to reduce the strip speed on the entry side of the rolling mill. When the rotational speed of the conventional oil film bearing for backup rolls decreases, the viscosity of the lubricating oil causes the oil to be trapped on the upper side, which is the load-receiving surface of the bearing, and the oil film becomes thicker. Since the box is held in a fixed position, the work roll gap is reduced, and it is out of the control allowable range of the automatic thickness control (AGC). There was obtained a finding that such a thing is eliminated if the roller bearing. Another reason that the strip speed on the inlet side of the conventional rolling mill could not be reduced is that the friction coefficient between the roll and the strip changes during acceleration / deceleration, and the control of the roll rotation main motor is unstable. In some cases, it was necessary to turn off the automatic thickness control, but if the control was continued without turning it off even if the strip speed on the entry side was slow, the thickness would not change significantly. Obtained knowledge. The present invention is based on these findings.

That is, in order to achieve the above object, in the method of the present invention for joining a rear end of a preceding strip and a leading end of a succeeding strip and continuously rolling the same, one or more cold rolling of the strip is performed. A base rolling mill, an uncoiler (rewinding device) provided on the entry side of the rolling mill (the right side of the rolling mill 1 in FIG. 1), and for joining the rear end of the preceding strip and the front end of the succeeding strip. A welding machine, a dancer roll for accumulating a strip to be supplied during welding and an entrance tension generator, and an output tension generator provided on the output side of the rolling mill (the left side of the rolling mill 1 in FIG. 1). Equipment, a cutting machine and a coiler (winding device) for cutting the strip, and, if necessary, a joining machine and the like provided on the entry side of the rolling mill. The rolling mill is provided with an automatic thickness control device. And
In addition, using a continuous rolling facility in which the bearing of the backup roll of the rolling mill is a roller bearing, the rear end of the preceding strip and the front end of the following strip are joined while the automatic thickness control device is operated. During the rolling, the rolling mill is decelerated to perform rolling.

Further, in order to achieve the above object, in a continuous rolling equipment for continuously rolling by welding the trailing end of a preceding strip and the leading end of a succeeding strip according to the present invention, a single rolling mill for cold rolling a strip is provided. Or a plurality of rolling mills, an uncoiler (rewinding device) provided on the entry side of the rolling mill, a joining machine for joining the trailing end of the preceding strip and the leading end of the succeeding strip, while joining Roll and entrance tension generator for accumulating the strip to be supplied to the rolling mill, output tension generator provided on the output side of the rolling mill, cutting machine and coiler (winding device) for cutting the strip
And, if necessary, a cutting machine or the like provided on the entry side of the rolling mill. The rolling mill is provided with an automatic thickness control device, and the bearing of a backup roll of the rolling mill is a roller bearing. That is what we did.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of an example of the continuous rolling device of the present invention. The continuous rolling equipment according to one embodiment, which is also used in the continuous rolling method of the present invention, includes a rolling mill 1, an uncoiler 4 arranged on the entry side of the rolling mill 1, a joining machine 5 for strip joining, a dancer roll 6, and Entry side tension generator 7
And an output-side tension generator 8 disposed on the output side of the rolling mill 1,
It comprises a cutting machine 9, a coiler 10, and the like. The rolling mill 1 of the continuous rolling equipment of the present invention comprises one or more rolling mills, and can reduce the rolling speed to 1 to 10 m / min when the rolling speed is low. Each of the rolling mills has roller bearings for the bearings of the backup rolls 3a and 3b, and the other parts have the same structure as the conventional one, and are equipped with a normal automatic thickness control device (not shown). is there. Roller bearings used for the bearings of the backup rolls 3a and 3b of each rolling mill are configured so that the rollers roll, and have a normal structure.

The uncoiler 4 of the continuous rolling mill according to the present invention is composed of two or more units, and the structure thereof is the same as that of the conventional uncoiler 4a. 4b is on standby, and when the rewinding of the strip from one decoiler 4a is completed, the other uncoiler 4b on standby is rewound, and the leading end of the following strip is attached to the trailing end of the preceding strip. And strips are continuously supplied. The joining machine 6 is a welding machine, a forging machine, or the like conventionally used for joining strips.

The above-mentioned dancer roll 6 of the continuous rolling equipment of the present invention comprises a strip 11 for supplying to the rolling mill 1 while the trailing end of the preceding strip and the leading end of the succeeding strip are joined by the joining machine 6. And the height may be about 8 m at the maximum. That is, the rolling speed of the rolling mill 1 during the joining of the strip 11 is 1 to 10 m / min, and the joining time is about 1.5 minutes in the case of welding. Since the height of the dancer roll 6 may be 15 m, the height of the dancer roll 6 may be about 8 m at the maximum. Furthermore, the upper and lower entry side tension generators 7, 8 of the present invention.
Gives tension to the strip during rolling,
Tension bridle roll and the like. The cutting machine 9 may be one conventionally used for cutting a running strip such as a high-speed shearing machine. Further, the coiler 10 is a tension reel or the like composed of two or more units, and its structure may be the same as that of a conventional one. Although not shown in FIG. 1, a cutting machine provided as necessary on the rewinding machine 4 side of the joining machine 5 is for cutting the leading and trailing ends of the strip supplied to the rolling mill 1. The structure may be the same as the conventional one used for cutting the leading and trailing ends of the strip supplied to the rolling mill 1.

Next, an example of a method of using the continuous rolling equipment will be described. The unwinding of the strip from the uncoiler 4a is completed and the rear end stops moving at the joining machine 5,
When the end of the strip unwound from the uncoiler 4b reaches the joining machine 5, the strip stops and the two are joined. During this time, the rolling mill was operated at a speed of about 1200 m / min.
The strip 11 supplied to the rolling mill 1 is supplied from the dancer roll 6 during the rolling at a speed of 10 m / min. Since this joining is completed in about 1.5 minutes in the case of welding, when the joining is completed, the rolling mill rolls at an increased speed, and when the joined portion comes to the cutting machine 9, it is cut. The wound coiler 10a is changed to another coiler 10b and wound.
If the thickness of the wound strip is greater than a predetermined thickness, the coil of the wound strip is conveyed to the uncoiler side 4 and rolled again to a predetermined thickness while being rewound by the uncoiler again. Further, when the thickness of the wound strip is a predetermined thickness, the strip is transported as a finished product to a predetermined storage location.

Next, the continuous rolling method of the present invention will be described. The continuous rolling method of the present invention uses the above continuous rolling equipment, reduces the rolling speed of the rolling mill while joining the trailing end of the preceding strip during continuous rolling and the leading end of the succeeding strip, and performs rolling. Rolling is performed with the automatic thickness control device installed in the machine activated. The reduction of the rolling speed of the rolling mill in this method is for shortening the strip supplied to the rolling mill during the welding, and if the reduced rolling speed is too high, the dancer roll 6 needs to be increased. Preferably it is 1 to 10 m / min.

[0013]

According to the present invention, even if the rear end or the leading end of both strips is stopped running while the trailing end of the preceding strip is joined to the leading end of the succeeding strip by welding or the like, the rolling mill can be extremely improved. Since the rolling is performed at a low speed, the length of the strip supplied to the rolling mill may be small, so that the dancer roll 6 may be used.
Can be supplied from the amount stored in the storage. Furthermore, since the rolling mill has roller bearings for the backup rolls 3a and 3b, the strip thickness can be rolled without changing the thickness even when rolling at a low speed. Therefore, even if this rolling mill is rolled at a low speed, the friction coefficient between the work roll and the strip remains moving without moving → static → moving. The sheet thickness does not change extremely.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a continuous rolling apparatus according to one embodiment of the present invention comprises three rolling mills 1a, 1b, 1c comprising work rolls 2a, 2b and backup rolls 3a, 3b. Two decoilers 4a and 4b are provided on the inlet side of the rolling mill 1, a welding machine of a joining machine 5 provided between the rolling mill 1 and the uncoiler 4, and a welding machine provided on the rolling mill 1 side of the joining machine 5. A dancer roll 6 having a height of 4 m and an entrance tension bridle roll of an entrance tension generator 7 provided between the dancer roll 6 and the rolling mill 1 are arranged. A tension tension bridle roll on the output side of a side tension generator 8, a cutting machine 9 for cutting a strip at high speed, and tension reels 10a and 10b of two coilers are arranged. 1a, 1b, 1c backup roll
The bearings 3a and 3b use roller bearings and are provided with an automatic thickness control device (not shown). This continuous rolling machine has a normal rolling speed of about 1200 m / min,
The rolling speed can be set to about 1 to 5 m / min during welding of the strip.

[0015]

The continuous rolling method of the present invention and the continuous rolling equipment for implementing the method are constructed as described above,
It has the following excellent effects. (1) The dancer roll is very economical because it is inexpensive because the device is very small compared to the strip accumulator, and the installation place can be reduced. (2) The off-gauge portion of the strip is generally thicker than a predetermined thickness, but since the strip is joined, it can be rolled with tension applied, so that the off-gauge portion has commercial value. It can be thinner than a predetermined plate thickness. (3) Since the batch type tandem rolling mill can be modified with a small investment, it is possible to reduce roll troubles such as off-gauge, biting and roll scratches at the time of butt removal occurring in the batch type tandem rolling mill. .

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of one embodiment of a continuous rolling facility of the present invention.

FIG. 2 is a conceptual diagram of a conventional continuous rolling mill.

FIG. 3 is a conceptual diagram of another conventional loop-type continuous rolling mill.

[Explanation of symbols]

 1, 1a, 1b, 1c Rolling mill 2a, 2b Work roll 3a, 3b Backup roll 4, 4a, 4b Uncoiler 5 Welding machine 6 Dancer roll 7 Inlet tension generator 8 Outlet tension generator 9 Cutting machine 10, 10a 10b Coiler 11 Strip 12 Shearing machine 13 Strip storage device 14 Free loop 15 Shearing machine during running 16 Winding / unwinding machine 17 Welding machine

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B21B 37/18 B21B 37/12 111A (72) Inventor Yasuhiro Fujii 1 Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries Co., Ltd. (72) Inventor Fumio Kakuhari 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd.

Claims (2)

[Claims] 1. A rolling mill or rolls (1) for cold rolling a strip, an uncoiler (4) arranged on the entry side of the rolling mill (1), a rear end of a preceding strip and a subsequent A joining machine (5) for joining the leading ends of the strips, a dancer roll (6) and an entry-side tension generator (7) for accumulating the strips to be supplied during joining;
An output side tension generator (8) arranged on the output side of the rolling mill (1), a cutting machine (9) for cutting a strip, and a coiler (10). The rolling mill (1) has an automatic sheet thickness. A control device is provided, and a continuous rolling equipment in which the backup rolls (3a, 3b) of the rolling mill (1) are roller bearings is used, and the automatic thickness control device is operated. A continuous rolling method wherein the rolling mill is slowed down and rolled while the trailing end of the preceding strip is joined to the leading end of the succeeding strip. 2. One or more rolling mills (1) for cold rolling a strip, an uncoiler (4) arranged on the entry side of the rolling mill (1), a rear end of a preceding strip and a subsequent A joining machine (5) for joining the leading ends of the strips, a dancer roll (6) and an entry-side tension generator (7) for accumulating the strips to be supplied during joining;
An output side tension generator (8) arranged on the output side of the rolling mill (1), a cutting machine (9) for cutting a strip, and a coiler (10). The rolling mill (1) has an automatic sheet thickness. A continuous rolling plant provided with a control device, wherein a bearing of a backup roll (3a, 3b) of the rolling mill (1) is a roller bearing.