JPH11254019A - Device and method for threading strip in rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a roll from being scratched by striking the surfaces of various kinds of rolls provided along the strip threading route by the top and end parts of a metallic strip at the time of threading a coil-shaped metallic strip in a rolling mill. SOLUTION: At the time of rolling that is shown in Figure (a), the rolling of the metallic strip 1 is executed while coiling the metallic strip 1 which is supplied from a pay-off reel 2 or tension reel 12 around a tension reel 3 in the reversing rolling mill 4 and coiling the metallic strip 1 which is supplied from the tension reel 3 with the tension reel 12. The shape of the rolled metallic strip 1 is detected by shape detecting rolls 7, 14 while bringing them into contact with the strip. The direction of the metallic strip 1 is changed by deflector rolls 8, 9 while bringing them into contact with the strip. When the top and end parts are passed through, the metallic strip 1 is switched to the threading route for retreating as shown in Figure (b) by push-up rollers 15, 16. The surfaces of the shape detecting rolls 7, 14 are protected with shape protectors 8, 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling apparatus and a method for smoothly passing a leading end or a trailing end of a metal strip through a rolling mill when the metal strip is rolled.

[0002]

2. Description of the Related Art Conventionally, a rolling apparatus that continuously rolls a coil-shaped metal strip is provided with a direction in which a metal strip supplied from a pay-off reel passes along a rolling pass line, and a rolled metal strip. In order to change the direction in which the metal strip passes when the reel is wound on a tension reel, a deflector roll is provided. In addition, a shape detection roll may be used to detect the shape of the rolled metal strip and perform feedback control so as to obtain a desired profile. The deflector roll and the shape detection roll come into contact with the surface of the metal strip, and perform shape detection in response to a change in the passing direction and a partial change in tension.

[0003] When flaws occur on the surface of the deflector roll or the shape detection roll, they are transferred to the surface of the metal strip to be passed,
The quality of the metal strip to be rolled is degraded. If the surface of the deflector roll is flawed, the deflector roll will be replaced. If the shape detection roll incorporates a load cell or the like inside and is recombined when the surface has a flaw, it is very expensive. For the shape detection roll,
A protector that protects the surface from being scratched is used.

[0004] Japanese Patent Application Laid-Open No. Hei 4-273003 discloses a prior art concerning a protector which is installed on a rolling line of steel or the like and protects the surface of a shape detecting device for magnetically detecting distortion of a steel plate. . In this prior art,
Move the protector to the surface of the shape detection device to prevent it from hitting and damaging the surface of the shape detection device at the leading end of the steel plate at the start of passing and at the rear end of the steel plate at the completion of passing. To protect it. During rolling, the protector retracts from the surface of the shape detector,
The detection of the shape of the steel sheet by the shape detection device is not hindered.

[0005]

When the leading edge or the trailing edge of the metal strip passes, the edge of the metal strip may damage the surface of the deflector roll and the surface of the shape detecting roll. For this purpose, the surface is hardened to prevent flaws. As a method of surface hardening, chrome (C
r) There are methods such as plating and tungsten carbide (WC) thermal spraying, but it is difficult to completely prevent the flaws generated when the front and rear ends of the metal strip hit the surface of the deflector roll.

When the tip of a metal strip is wound around a tension reel, slip flaws occur on the surfaces of the deflector roll and the shape detection roll because the surface speeds of the metal strip and the deflector roll and the shape detection roll are different. There is also. The protector used to protect the surface of the shape detection roll cannot withstand the winding tension when the metal band is wound around the tension reel. There is also a disadvantage that effective protection cannot be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a metal that can effectively protect the surface of a roll disposed along a path through which a metal strip passes through a rolling mill when the front end or the rear end of the metal strip passes. It is an object of the present invention to provide an apparatus and a method for passing a band.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a rolling mill for continuously feeding a metal strip and winding the rolled metal strip, wherein a plurality of types of rolls are arranged along a threading path of the metal strip. And a path switching mechanism that switches between a path through which the metal strip passes through the rolling while contacting the surface of the roll, and a path that does not contact the surface of the roll. Machine.

According to the present invention, the path switching mechanism comprises: a path for rolling while the metal strip is in contact with the surface of a plurality of types of rolls arranged along the passing path of the metal strip; The path to be passed is switched so as not to contact the surface. If the threading path is switched so that it does not contact the surface of the roll, the leading and trailing ends of the metal band will not scratch the surface of the roll, and even if the metal band contacts the roll during rolling, Since there is no flaw, the metal strip can be rolled with good quality without generating any flaw transferred to the surface of the metal strip.

In the present invention, the plurality of types of rolls include a deflector roll and a shape detection roll, and the path switching mechanism includes a pay-off mechanism for enabling switching by shifting a threaded path of a metal band. At least one vertically movable push-up roller is provided between the reel and the roll and between the tension reel and the roll.

According to the present invention, the vertical movement of the push-up roller of the path switching mechanism causes the deflector roll and the shape detection roll, which are always in contact with the metal band at the time of rolling, to pass when the metal band starts to be threaded or when the threading is completed. Since the plate path can be shifted to protect the surface from being scratched, a metal band having good surface quality can be obtained.

The present invention also provides the above-mentioned shape detecting roll,
It is characterized in that a shape protector is provided for preventing contact between the front end and the rear end of the metal strip due to rebound.

According to the present invention, when the metal strip passes through the leading end and the trailing end, the shape protector prevents the surface of the shape detecting roll from coming into contact with the surface. be able to. When passing the front or rear end of the metal band, to prevent scratches on the roll surface,
For example, since it is not necessary to reduce the passing speed, the production efficiency of the rolling device can be improved.

Further, the present invention provides a metal sheet passing route to a rolling mill which is switched between rolling and passing a leading end and a trailing end before and after rolling. This is a method of passing a rolling mill, wherein the metal strip is prevented from contacting a plurality of types of rolls arranged along the passing threading path.

According to the present invention, when the metal strip passes through the leading and trailing ends, the metal strip passing path path is set so as not to contact the surfaces of a plurality of types of rolls arranged along the rolling path during rolling. Therefore, it is possible to prevent the surface of the roll from being hit and damaged by the leading end or the rear end, and to prevent the deterioration of the surface quality due to the transfer of the flaw generated on the surface of the roll to the metal band.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of a threading device of a rolling mill as one embodiment of the present invention. FIG.
1A, a metal strip 1 is supplied from a payoff reel 2 or the like, and is rolled by rolling rolls 5 and 6 of a rolling mill 4 while being wound up by a tension reel 3, and the shape of the rolled metal strip 1 is detected by a shape detecting roll 7. Shows a state in which the deflector rolls 8 and 9 maintain the threading path 10 for rolling. Rolling mill 4
Is a reversing system, in which a coiled metal strip 1 is passed from a payoff reel 2 to a rolling mill 4 via a deflector roll 9 along a feed-through path 11 and the metal strip 1 after rolling is transferred to a tension reel 3. After passing through the web with the metal strip 1
Is wound around the tension reel 12, and the metal strip 1 is reciprocated between the tension reels 3 and 12, whereby the metal strip 1 is rolled. In addition, when rolling by passing the sheet in the reverse direction, a shape detection roll 14 is also provided on the side where the payoff reel 2 is arranged, in order to detect the rolling shape of the metal strip 1.

FIG. 1 (b) shows a deflector roll 8, 9 and a shape detection roll 7, 1 by switching the passing route of the metal strip 1.
4 shows a state in which contact with the surface of No. 4 is prevented. In the rolling mill 4, the interval between the rolling rolls 5 and 6 increases. Push-up rollers 15 and 16 are arranged near the deflector rolls 9 and 8, respectively.
4, 7 and the deflector rolls 9 and 8 can be pushed up and shifted so as not to come into contact with the surfaces of the deflector rolls 9 and 8. In this state, the surfaces of the shape detection rolls 14 and 7
Furthermore, it can be covered and protected by the shape protectors 17 and 18.

In particular, when the metal strip 1 is supplied from the pay-off reel 2 through the supply passage path 11 and the tip of the metal strip 1 is wound around the tension reel 3, the belt wrapper 19 is used.
Is used. The bell trapper 19 requires a certain amount of winding tension. In general, the shape protectors 17 and 18 cannot withstand this winding tension. The threading path 20 can be maintained.

The push-up rollers 15 and 16 and the shape protectors 17 and 18 for protecting the surface, which constitute the path switching mechanism shown in FIG. When the sheet is passed along the path 10, it moves to a retreat position away from the passing path. The belt wrapper 19 shown in FIG. 1B separates from the tension reel 3 and waits after the end of the metal band 1 is wound around the tension reel 3.

A rolling mill 4 shown in FIG. 1 is, for example, a Sendzimir type cold rolling mill having a multistage backup roll in addition to a pair of rolling rolls 5 and 6, and repeatedly rolls a metal strip 1 by a reversing method. . In the first pass of the repetitive rolling, the coil wound with the metal strip 1 is supplied from the payoff reel 2 to the rolling mill 4 along the supply threading path 11, and is wound on the tension reel 3. At this time, the shape protectors 17 and 18 on both sides and the lifting roller 16 on the tension reel 3 side are used.
1 (b), and the push-up roller 15 on the payoff reel 2 side is set to an offline state as shown in FIG. 1 (a).

The metal strip 1 is repeatedly rolled with the front end and the rear end wound around the tension reels 3 and 12, respectively.
Therefore, it is not possible to roll the front end portion and the rear end portion of the length from the rolling mill 4 to the tension reels 3 and 12. Therefore, a metal band called a service tail is welded and added before and after the metal band to be rolled, and the portion of the metal band 1 excluding the service tail is repeatedly rolled by the rolling mill 4. When the tip of the service tail at the tip of the metal strip 1 supplied from the payoff reel 2 reaches just before the belt wrapper 19 of the tension reel 3, the supply of the metal strip 1 from the payoff reel 2 is stopped.

Next, the shape protectors 17 and 18 are set to an off-line state as shown in FIG. The service tail at the tip of the metal strip 1 is wound around the tension reel 3 using a belt wrapper 19. When the weld between the service tail at the tip of the metal strip 1 and the main body of the metal strip 1 has passed the portion of the rolling rolls 5 and 6 of the rolling mill 4, the push-up roller 16 is moved to the position shown in FIG.
In the off-line state as shown in (a), the rolling rolls 5 and 6 of the rolling mill 4 are closed, and rolling in the first pass is started.

After the rolling of the first pass, in order to remove the rear end of the metal strip 1 from the payoff reel 2, the space between the rolling rolls 5 and 6 of the rolling mill 4 is opened, and the payoff reel 2 and the tension reel 3 are connected to one another. Performs continuous operation for inching simultaneously with the switch. While winding the metal strip 1 on the tension reel 3, the rear end of the metal strip 1 distant from the payoff reel 2 is advanced to the position of the tension reel 12. Up to this point,
Above the tension reel 12, an extendable feeding plate table to be described later is spread. Next, the push-up roller 15 is
(B), the sheet feeding table is shrunk, and the sheet feeding table is placed in an off-line state in which the sheet feeding table is removed from the sheet passing path of the metal strip 1. The rear end of the metal strip 1 is automatically wound around the tension reel 12 while the push-up roller 15 remains online.

After the automatic winding is completed, the winding of the metal strip 1 on the tension reel 3 is continued until the welded portion between the service tail on the rear end side and the metal strip 1 passes just below the rolling rolls 5 and 6. When the welded part goes below the rolling rolls 5 and 6,
The lifting roller 15 is set to the off-line state shown in FIG. 1A, and the rolling direction of the second pass is started by reversing the passing direction of the metal strip 1. Hereinafter, rolling for reciprocating the metal band 1 between the tension reels 3 and 12 is performed a predetermined number of times, and the metal band 1 is withdrawn from the tension reel 3 or the tension reel 12 to complete the rolling process.

After the completion of the rolling, the tension reels 3, 12
, And move the rear end of the metal strip 1 to the tension reel 1
2 and stop before reaching the deflector roll 9. Next, the push-up rollers 15, 16 and the shape protectors 17, 18 are all brought online as shown in FIG. 1 (b), and are wound on the tension reel 3 up to the rear end of the metal strip 1. When the rear end of the metal strip 1 is wound on the tension reel 3, the coil of the metal strip 1 to be rolled next is mounted on the payoff reel 2, and the front end of the metal strip 1 is threaded to the position of the deflector roll 9. Keep it. After removing the coil of the metal strip 1 from the tension reel 3, the tip of the metal strip 1 to be rolled next is advanced from the position of the deflector roll 9 to the position of the tension reel 3, and wound around the tension reel 3 by the belt wrapper 19. wear.

FIG. 2 shows a more detailed configuration of a portion from the push-up roller 15 to the shape detection roll 14 in FIG. The portion from the shape detection roll 7 to the push-up roller 16 has basically the same configuration. The shape protector 17 for protecting the surface of the shape detection roll 14 is connected to the tip of the rod 22 of the cylinder 21. Cylinder 21 is rod 22
Is projected, the shape protector 17 can be brought online to cover and protect the surface of the shape detection roll 14. The push-up roller 15 can be switched between an off-line state as shown in FIG. 1A and an on-line state as shown in FIG. 1B by a lifting mechanism 24 provided therebelow.

FIGS. 3 and 4 show the configuration of the shape detecting rolls 7 and 14 shown in FIG. The shape detection rolls 7 and 14 include a plurality of divided rolls 4 arranged in the axial direction.
It consists of 0. Shaft 41 of shape detection rolls 7, 14
Is rotatably driven by a motor 42 and rotatably supported by bearings 43 and 44. The shaft 41 and the output shaft of the motor 42
They are connected via a coupling 45.

As shown in FIG. 4, the split roll 40 has a steel core 46 around an axis 41,
6, a gap 47 is formed to facilitate deformation. Around the steel core 46, a cylindrical sleeve 4
8 is fitted, and a coating layer 49 is formed on the surface by thermal spraying. Along the inner circumference of the sleeve 48,
A plurality of load cells 50 are arranged on the steel core 46. A plurality of split rolls 40 are arranged in the axial direction,
Each of the divided rolls 40 is distorted into a different state in accordance with a difference in the tension of the metal strip 1 in contact therewith, and the amount of the distortion is electrically detected by the load cell 50. Regarding the formation of the coating layer 49 by thermal spraying, the present applicant has disclosed in
17 (Japanese Patent Application No. 7-149254) discloses a prior art.

FIG. 5 shows a more detailed configuration of the portion from the payoff reel 2 to the tension reel 12 in FIG.
When the metal strip 1 is supplied from the payoff reel 2 to the rolling mill 4 along the supply threading path 11, the tension reel 1
The telescopic feeding plate table 60 is spread on the top 2. Since the metal strip 1 is sandwiched between the metal strips 1 when it is wound into a coil, the slip sheet is supplied to the metal strip 1 when the metal strip 1 is supplied.
And take up. A guide table 62 is provided at a portion where the metal band 1 is supplied from the payoff reel 2 to smoothly guide the leading end portion of the service tail of the metal band 1 which is fed from the payoff reel 2 to the supply passage 11. Making it possible. When winding the metal strip 1 on the tension reel 12 or when supplying the metal strip 1 from the tension reel 12,
The interleaf is supplied from the interleaf take-up and supply device 63 and wound up.

FIG. 6 shows the structure of a tension reel 3 which can finally take up and remove the metal strip 1 after rolling. The belt wrapper 19 is moved to the tension reel 3 when the leading end of the metal strip 1 is wound on the tension reel 3, and the belt wrapper 19 is moved away from the tension reel 3 except at the start of winding. An apparatus 70 is provided. When the metal band 1 is wound on the tension reel 3 and when the metal band 1 is supplied from the tension reel 3, the slip sheet is supplied from the slip sheet winding and feeding device 71, and the slip sheet is wound. Done.

FIG. 7 shows a structure for automatically winding the tip of the metal strip 1 with the tension reels 12 and 3. FIG.
As shown in (a), in the tension reel 12, the rear end of the metal strip 1 supplied from the payoff reel 2 is
The metal strip 1 is wound by rotating the winding shaft 80 while inserting and holding it in a gripper device 81 provided inside the metal strip 1. FIG. 7 (b)
In the tension reel 3 shown in FIG. 1, the rubber belt 91 of the belt wrapper 19 is brought into contact with the outside of the winding shaft 90, and
The leading end of the metal band 1 is fed between the rubber belt 91 and the rubber belt 91 for winding. The rubber belt 91 is wound around a plurality of rollers 93 mounted on a movable arm 92,
Is completed, the movable arm 92 is rotated.
Is deformed so as to open the rubber belt 91, and the belt wrapper moving device 70 moves the belt wrapper 19 in a direction away from the tension reel 3 and retracts.

In the above description, the shape protectors 17, 1
8 is off-line at the start of winding by the belt wrapper 19, so that the shape protectors 17, 18 which cannot withstand the same winding tension as in the related art can be used. If the shape protectors 17 and 18 are formed mechanically firmly so as to withstand the winding tension by the belt wrapper 19, the shape protectors 17 and 18 can be formed even when the winding of the metal band 1 onto the tension reel 3 by the belt wrapper 19 is started. The surface of the detection rolls 7 and 14 can be protected.

In the embodiment described above, a reversing type rolling mill is used as the rolling mill 4.
Even in a rolling mill in which a sheet is passed in only one direction by a tandem method, the present invention can be applied to protect the surface of various rolls when the metal strip passes through the leading end and the trailing end.
However, in a tandem rolling mill, the metal strips are successively connected by welding and rolling is performed continuously, so that the frequency at which the leading end and the trailing end pass is reduced. In the reversing type rolling mill 4 as in the present embodiment, the frequency of passage at the leading end and the trailing end increases, so that the effect of the present invention can be particularly expected.

[0034]

As described above, according to the present invention, the path of the metal strip is switched by the path switching mechanism, and the surface of the various rolls arranged along the path of the rolling at the time of rolling is damaged. Prevention can be achieved.

Further, according to the present invention, protection of the deflector roll and the shape detection roll is performed by shifting the passing path of the metal body by the push-up roller, and the flaw on the surface of the metal strip due to the flaw of these rolls is provided. Transfer can be prevented and the surface quality of the metal strip to be rolled can be kept good.

Further, according to the present invention, the contact of the metal strip with the shape detecting roll due to the rebound can be reliably protected by the shape protector when the metal strip passes through the front and rear ends.

Further, according to the present invention, the rolling path is switched so that the metal strip does not come into contact with the roll provided along the rolling path when rolling the metal strip so as to pass through the leading end and the rear end of the metal strip. Therefore, the surface of the roll is knocked by the leading end and the rear end to generate flaws, and the flaws are transferred to the surface of the metal band by the contact between the metal band and the roll by the passing plate during rolling, and the surface of the metal band It is possible to reliably prevent the quality from deteriorating.

[Brief description of the drawings]

FIG. 1 is a simplified side view showing a schematic configuration of a threading device of a rolling mill as one embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a part from a push-up roller 15 to a shape detection roll 14 in the embodiment of FIG.

FIG. 3 is a front view showing a configuration relating to shape detection rolls 7 and 14 in the embodiment of FIG.

FIG. 4 is a side sectional view of a split roll 40 constituting the shape detection rolls 7 and 14 of FIG.

FIG. 5 is a side view showing a configuration of a portion from a payoff reel 2 to a deflector roll 9 in the embodiment of FIG.

FIG. 6 is a side view showing a configuration related to the tension reel 3 in the embodiment of FIG.

FIG. 7 is a simplified side sectional view showing a configuration for winding the metal band 1 on the tension reels 3, 12 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal strip 2 Payoff reel 3,12 Tension reel 4 Rolling machine 5,6 Rolling roll 7,14 Shape detection roll 8,9 Deflector roll 10 Rolling plate path 11 Supply plate path 15,16 Push-up roller 17,18 Shape protector 19 Bell trapper 20 Evacuation plate passage 21 Cylinder 24 Lifting mechanism 40 Split roll 49 Coating layer 60 Feeding table 62 Guide table 70 Bell trapper moving device 80, 90 Take-up shaft 81 Gripper device 91 Rubber belt 92 Movable arm

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mie Shigeeda 4976 Nomura Minamicho, Shinnanyo City, Yamaguchi Prefecture Nisshin Steel Co., Ltd., Shunan Steel Works (72) Inventor Katsumi Kanemasu 4976 Nomura Minamicho, Shinnanyo City, Yamaguchi Prefecture Nisshin Steel Corporation Shunan Steel Works

Claims (4)

[Claims] 1. A rolling mill for continuously feeding a metal strip and winding a rolled metal strip, comprising: a plurality of types of rolls arranged along a threading path of the metal strip; And a path switching mechanism for switching between a path for rolling while contacting the surface of the roll and a path not contacting the surface of the roll. 2. The plurality of types of rolls include a deflector roll and a shape detecting roll, and the path switching mechanism includes a payoff reel and a rolling mill for enabling switching by shifting a threading path of a metal strip. 2. The threading machine according to claim 1, wherein at least one vertically movable push-up roller is provided between the roll and the tension reel and the roll. 3. The shape detecting roll is provided with a shape protector for preventing contact of a front end and a rear end of a metal band due to rebound.
A threading device for a rolling mill as described above. 4. A metal sheet passing path to a rolling mill is switched between rolling and passing a leading end and a trailing end before and after rolling. A thread passing method for a rolling mill, wherein a metal strip is prevented from contacting a plurality of types of rolls arranged along a sheet path.