JP4331833B2 - Winding the strip - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention prevents the occurrence of slip wrinkles on the strip surface when winding a strip on the rear surface of a steel strip in a hot rolling line or other various processing lines, and also provides a coil with a good winding shape. It relates to a winding method.
[0002]
[Prior art]
In various processing lines such as a steel strip hot rolling line, a strip-shaped material to be processed is processed and then wound into a coil by a winding facility on the rear surface of the line. Since the wound coil is sent to the next process and subjected to another processing or shipped as a product, it is necessary to make the coil surface free from slip wrinkles and a good wound shape. .
[0003]
For winding, the leading end of the strip is guided to a winder, and the mandrel of the winder is bitten, the mandrel is rotated, and the strip is sandwiched by a pinch roll provided on the inlet side of the winder (this) Is called pinching). And the rotational speed of a pinch roll is adjusted, and the coil | winding shape of the coil is made favorable by giving back tension to the coil in winding.
In a normal line, since two strips are sent one after another, two winders are provided. On the other hand, a coil is wound and the next strip is wound.
[0004]
In such strip winding equipment, the pinch roll has a role of imparting a rearward tension to the strip. In addition, the pinch roll of the two front side winders provided is the progress of the leading end of the fed strip. It has a role to change direction. When it is introduced into the front winder, the roll is set in an offset state and the traveling direction is bent, and when it is fed to the front winder , there is no offset. When changing from the offset state to the non-offset state or vice versa, the roll gap is opened and the roll on one side is moved parallel to the strip, and then the gap is closed and pinched.
[0005]
Regarding the conventional winding method, Japanese Patent Laid-Open No. 60-184420 discloses that a roll gap between a pair of upper and lower pinch rolls provided on the inlet side of the winder is set to a predetermined material clamping interval at the start of winding. After the time when the material top part (head) is wound around the winder several times, the upper pinch roll is moved to a position not in contact with the material, and after the time when the material bottom part (tail part) passes through the rolling mill, By returning the upper pinch roll to the above-mentioned material clamping interval, the contact time of the pinch roll is shortened, the life of the pinch roll is extended, the coil winding shape is stabilized, the shape of the rolled material surface is deteriorated, and the effect of reducing the pressing force is reduced. Is disclosed.
[0006]
[Problems to be solved by the invention]
In a conventional strip winding apparatus, when a strip is pinched by a pinch roll, the roll is usually moved by a cylinder and brought into contact with the strip to be tightened. At this time, in order to apply the rear tension to the strip being wound, the roll is rotated at a peripheral speed smaller than the rotational peripheral speed of the strip wound around the winder.
[0007]
By the way, when the pinch roll is brought into contact with the strip suddenly by the cylinder, a sudden change in the winding tension occurs due to an unmatch between the strip running speed and the pinch roll rotation speed, or an unmatch between the roll gap and the strip thickness. There is a risk of operation failure and deterioration of coil quality such as strip breakage, loop formation and deterioration of winding shape.
In addition, if the pinch roll is tightened too much by the cylinder, it may cause an operation failure due to strip meandering or deterioration of coil quality.
Furthermore, due to disturbances such as pinch roll wear and strip thickness fluctuations, an appropriate rear tension cannot be applied to the strip, and there is a risk of coil shape deterioration due to insufficient tension or plate breakage due to over tension.
These problems cannot be solved by the technique disclosed in the above publication.
[0008]
Therefore object of the present invention is to provide, in the hot rolling line and other various processing line of the steel strip, when winding the strip in a winding equipment line rear, Ya slip flaw occurrence of the strip surface due to the pinch rolls coils wound shape of the degradation is to prevent such.
[0009]
[Means for Solving the Problems]
The method of the present invention for solving the above-described problem is that, in strip winding equipment, when pinching a strip passing through a roll gap of a pinch roll with a narrowing of the roll gap, the roll gap is first reduced in thickness of the strip. The roll is moved and narrowed by a cylinder mechanism up to t + α wider than t, and then the pinch roll is brought into contact with the strip so that the rotational peripheral speed becomes v−β smaller than the strip traveling speed v, and a rear tension is applied to the strip. In this case , the gap adjustment is performed by moving the roll by the gear mechanism until the current value of the pinch roll drive motor is set within a range of i ± Δi centered on the set value i. is there.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The winding method of the present invention is performed in a winding facility as shown in FIG. The strip 1 is sent from a rolling mill or the like (not shown), passes through the roll gap of the No. 0 pinch roll 4, is transported on the transport table 5, and the No. 1 pinch roll 6 is in an offset state as indicated by a solid line. In this case, the front end of the strip 1 is changed obliquely downward, introduced into the winder 2, wound around the mandrel 3 and wound up. After the end of the strip 1 passes through the roll gap of the No. 0 pinch roll 4, the roll gap is narrowed and the strip 1 is pinched with the No. 0 pinch roll 4.
[0011]
Before the winding by the winder 2 is finished, the No. 1 pinch roll 6 is set to an offset-free state as shown by a broken line, and after the winding is finished, the tip of the next strip 1 is set to No. as shown by a broken line. It is introduced into a winder (not shown) through a 2 pinch roll 7. Then, the coil of the winder 2 is removed, and the No. 1 pinch roll 6 is set in an offset state as shown by a solid line to prepare for winding of the next strip.
[0012]
When changing the No. 1 pinch roll 6 from the offset state to the non-offset state, or from the non-offset state to the offset state, the upper roll 15 is moved up and moved away from the strip 1 and then moved downward. And pinch in contact with the strip.
Note After winding completion, remove the coil until the next strip is sent, in so that line winding preparation Ryosu completed may be only winder 1 aircraft, in which case, No.1 pinch rolls 6 can be operated in the offset state.
[0013]
In the example of FIG. 1, during winding, the strip 1 is pinched with the No. 0 pinch roll 4, and the upper roll 15 and the lower roll 16 of the No. 0 pinch roll 4 are rotated at a peripheral speed smaller than the traveling speed of the strip 1. Rotational driving is performed to apply a rear tension to the coil. Note that the rear tension may be applied by adjusting the rotational peripheral speed of the No. 1 pinch roll 6 or the No. 2 pinch roll 7. The pinching is performed by lowering the upper roll 15 after the front end of the strip 1 passes through the roll gap and is wound around the winder.
[0014]
This onset Akinori is or pinching by the No.0 pinch rolls 4, No.1 in such pinching when changing the offset of the pinch rolls 6, the roll by the cylinder mechanism roll gap until broad t + alpha than first strip thickness t Is moved and narrowed, and then the roll is moved by the gear mechanism to contact the strip. In the example of FIG. 1, the upper roll 15 of the No. 0 pinch roll 4 is lowered by the roll lifting mechanism 11 to be pinched.
[0015]
The roll raising / lowering mechanism 11 is demonstrated by the example shown in FIG.
The upper roll 15 is moved up and down by a cylinder mechanism and a gear mechanism. In the example of FIG. 2, as shown in FIG. 2B, the bearing block 17 of the upper roll 15 is supported by the upper roll support frame 18, and the upper roll support frame 18 moves up and down by cylinders 21 and gear mechanisms provided at both ends. To do. The lateral movement of the upper roll 15 can be performed by moving the support frame 18 in the direction perpendicular to the paper surface by a mechanism (not shown).
[0016]
The cylinder 21 is supported by a fixed portion (not shown), the cylinder rod slides through the fixed frame 19, and the tip of the cylinder rod is connected to the upper roll support frame 18. When the cylinder rod is moved up and down by air pressure or the like, the upper roll support frame 18 moves up and down, and the upper roll 15 moves up and down accordingly.
[0017]
The gear mechanism includes a worm wheel 22 and a worm 23, and the lower side of the shaft of the worm wheel 22 is screwed to the fixed frame 19, and the upper side is in contact with the movable frame 20. When the worm wheel 22 is rotated, the movable frame 20 moves up and down, and the upper roll support frame 18 connected by a support rod 24 that slides through the fixed frame 19 moves up and down, and the upper roll 15 moves up and down accordingly. . As shown in (a), the worm wheel 22 is rotated by the worm 23 from the drive motor 27 via the bevel gears 25 and 26.
Then, the shaft rotation speed of the worm 23 is measured by the tachometers 28 and 29, and the rotation of the drive motor 27 is controlled by the current control device 30 together with the measured value of the plate thickness gauge 14. Fine adjustments can be made.
[0018]
In the method of the present invention, when the upper roll 15 is stopped at the position of the roll gap t + α when the cylinder 21 is lowered, the roll gap when the upper roll 15 is lowered by the cylinder 21 in advance is set to the strip thickness t + α. Then, the rotational position of the worm wheel 22 is adjusted. Thereafter, the upper roll 15 is raised by the cylinder 21.
When pinching, the upper roll 15 is first lowered by the cylinder 21, and after the upper roll 15 stops at the position where the roll gap is t + α, the gear mechanism is operated, the worm wheel 22 is rotated by the drive motor 27, and the upper roll 15 is lowered to contact the strip 1. α is preferably several mm.
[0019]
By the present invention method lever, since the roll 15 over the No.0 pinch rolls 4 and No.1 pinch rolls 6 as shown in the example of FIG. 1 is gently brought into contact with the strip 1 in travel, rapid winding It eliminates the risk of quality deterioration such as fluctuations in take-up tension, strip breakage, deterioration and folding of winding shape due to loop formation, strip 1 meandering due to overtightening of pinch rolls, and occurrence of slip flaws on the strip surface. Is done.
[0020]
Further, according to the method of the present invention, in the pinching by the No. 0 pinch roll 4 or the pinching at the time of changing the offset of the No. 1 pinch roll 6, the rotational peripheral speed of the pinch roll is smaller than the strip running speed v− When applying a rearward tension to the strip, the gap is adjusted by moving the roll with the gear mechanism until the current value of the pinch roll drive motor is set within a range of i ± Δi centered on the set value i. .
In the example of FIG. 1, the upper roll 15 and the lower roll 16 of the No. 0 pinch roll 4 are driven to rotate by the driving motor 8, and the rotational speed is detected by the rotational speed detector 9.
[0021]
After the upper roll 15 is brought into contact with the strip 1 and pinched with the lower roll 16 as described above, the rotation of the rolls 15 and 16 is adjusted when adjusting to v-β smaller than the traveling speed v of the strip 1. The speed is reduced, the motor is used on the generator side, and the gap adjustment is performed by the gear mechanism 15 until the generated current value falls within a predetermined current value i ± Δi. At this time, when the current value is higher than i ± Δi, the worm wheel 22 is adjusted in the upward direction of the upper roll 15, and when lower than i ± Δi, the worm wheel 22 is adjusted in the downward direction.
[0022]
Thus by the present invention method lever, even if a disturbance such as wear and strip thickness variation of the pinch rolls, always appropriate tension is added to the strip 1. This eliminates the possibility of coil shape deterioration due to insufficient tension and plate breakage due to over tension.
[0023]
【The invention's effect】
According to the method of the present invention, when winding a strip on the rear surface of a steel strip in a hot rolling line or other various processing lines, there is no occurrence of slip flaws on the strip surface, and a coil with a good winding shape is stabilized. And contributes to the improvement of production efficiency and the production yield.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a winding device for carrying out the method of the present invention.
FIG. 2 is an explanatory view showing an example of a roll lifting mechanism for carrying out the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Strip 2 ... Winding machine 3 ... Mandrel 4 ... No.0 pinch roll 5 ... Conveyance table 6 ... No.1 pinch roll 7 ... No.2 pinch roll 8 ... Roll drive motor 9 ... Rotation number detector 10 ... Roll Drive control device 11 ... Roll raising / lowering mechanism 12 ... Gap control device 13 ... Tracking device 14 ... Plate thickness meter 15 ... Upper roll 16 ... Lower roll 17 ... Bearing block 18 ... Upper roll support frame 19 ... Fixed frame 20 ... Adjusting frame 21 ... Cylinder 22 ... Worm wheel 23 ... Worm 24 ... Support rod 25, 26 ... Bevel gear 27 ... Gear drive motor 28, 29 ... Tachometer 30 ... Current control device

Claims (1)

When stripping a strip that is passing through the roll gap of a pinch roll in a strip winding device, the roll is first moved by the cylinder mechanism to t + α, which is wider than the strip thickness t, when the roll gap is narrowed and pinched. by narrowing, then when adding the backward tension to the strip by a small v-beta than the running speed v of the strip rotational peripheral speed in contact with the strip the pinch rolls, the current value of the pinch roll driving motor setpoint the i to settle in the range of i ± .DELTA.i around winding method of strips by moving the rolls and performing gap adjustment by a gear mechanism.

Images