JP2000263131A - Strip winding method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable stable passing of a strip with a winding pinch roll and prevent the strip tip from sticking. The tip of the A trailing strip S ₂ when passing the plate in the pinch roll 3 preparative upstream winding, so as not to water film pinch roll 3 preparative the upstream side winding, leading strip at the strip shear 2 nozzle before cutting the tail end of the S ₁ 2
After the cooling liquid supply valve 1 is turned off, the tail end of the preceding strip S ₁ is cut off by the strip shear 2 and the succeeding strip S ₂ passes through the upstream winding pinch roll 3.
At the same time when the downstream winding device 6 is turned on, the cooling liquid supply valve of the nozzle 21 is turned on to restart the supply of the cooling liquid to the upstream winding pinch roll 3. Set the coolant supply valve to O
The FF timing is determined in consideration of the time from when the valve is stopped to when the water from the header completely runs out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, cutting a strip fed from a hot rolling mill into a predetermined length by a strip shear, and cutting the cut strip through a plurality of winding pinch rolls. The present invention relates to a method of winding by a winding device.

[0002]

2. Description of the Related Art In recent years, in the field of hot rolling, in order to improve yield and productivity, so-called endless rolling, in which strips are joined at the upstream side of a finishing mill and the joining strips are continuously rolled, has been developed. Is being done. 4 and 5
1 schematically shows an example of an arrangement of strip shears and winding equipment in an endless rolling line, in which a strip S sent from a finishing mill 1 is cut by a strip shear 2, and a preceding strip S ₁ is upstream. with wound by the upstream winding device 4 through the pinch rolls 3 preparative side winding is the case of winding by the downstream winding device 6 through the pinch rolls 5 for the trailing strip S ₂ preparative downstream winding . In the drawings, reference numerals 7 to 16 denote passing plate guides, 17 and 18 denote high-speed passing devices which prevent flapping of the strips by sucking the strips, and 19 and 20 denote pinch rolls. 7 ~
The upper rolls 11, 13, 14, 16, the high-speed threading devices 17, 18, and the pinch rolls 19, 20 pass the pass line P until the leading end of the _first preceding strip S1 is wound around the upstream winding device 4. is spaced above (see FIG. 4), the leading edge of the preceding strip S ₁ is after wound around the upstream-side winding device 4 is placed close to the pass line P is lowered (see FIG. 5), the strip in this condition The cutting of the strip S by the shear 2 and the winding of the strip S by the upstream and downstream winding devices 4 and 6 are repeated.

Further, as shown in FIG. 6, a cooling liquid is sprayed from a nozzle 21 to each of the upstream and downstream winding pinch rolls 3, 5 in order to withstand the high heat of the strip S. ing.

[0004]

SUMMARY OF THE INVENTION
In the conventional strip winding method, the upstream side and the lower side are used.
Inject the coolant to each of the winding pinch rolls 3 and 5 on the flow side
Water is always applied to the winding pinch rolls 3 and 5
A film is formed, and this water film causes, for example, an upstream winding pinch roll.
Strip 3 at Rule 3_TwoWhen passing the tip of
Trailing strip S _TwoAnd the upstream winding pinch roll 3
The friction coefficient between the upstream winding pinch roll 3 and the
The tension between the shear output side pinch roll 20 is lost,
As shown in FIG. 6, the input side of the upstream winding pinch roll 3
Under the passing plate guide 13. This relaxation
Only propagates to the exit side of the upstream winding pinch roll 3
Therefore, the following strip S below the passing plate guide 14_Two
The behavior of the leading edge becomes unstable, and in the worst case,
Top S_TwoThe end of the pinch roll 3 and the thread
I thrust into the gap with Id 14,
Lip S_TwoThe tip is on the downstream winding pinch roll 5 side or above
The tip of the triangular gate 23 that guides to the upstream winding device 4
There is an inconvenience that it rushes to. Note that in FIG.
Reference numeral 22 denotes a table roller for transporting the strip.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a method of winding a strip capable of preventing a strip tip from sticking by enabling a stable passing of the strip with a pinch roll. The purpose is to provide.

[0006]

In order to achieve the above object, a strip winding method according to claim 1 is to cut a strip sent from a rolling mill into a predetermined length by a strip shear and cut the strip. Winding the strip with a plurality of winding devices via a pinch roll, wherein when the tip of the strip is passed through the pinch roll, the pinch roll is prevented from forming a water film on the pinch roll. The supply of the cooling liquid to the fuel cell is stopped.

According to a second aspect of the present invention, there is provided a method for winding a strip.
A method in which a strip sent out from a rolling mill is cut into a predetermined length by a strip shear, and the cut strip is wound by a plurality of winding devices via a winding pinch roll, and the upstream winding is performed. After cutting the tail end of the preceding strip wound by the upstream winding device via the pinch roll with a strip shear, the subsequent strip is wound by the downstream winding device via the downstream winding pinch roll. In this case, when the leading end of the following strip is passed through the upstream winding pinch roll, the upstream winding pinch roll is moved to the upstream winding pinch roll so that no water film is formed on the upstream winding pinch roll. The supply of the cooling liquid is stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram for explaining a strip winding method according to an embodiment of the present invention, FIG. 2 is a time chart for explaining ON-OFF timing of a coolant supply valve, and FIG. It is explanatory drawing which shows the curvature height of the front-end | tip of the following strip in the output side of the upstream winding pinch roll. In this embodiment, the endless rolling line described in the conventional example (FIG. 5) is taken as an example, and the description of the overlapping part is omitted.

FIG. 1 shows a preceding strip S ₁ wound on an upstream winding device 4 via an upstream winding pinch roll 3.
Of the after cutting a strip shear 2 tail end, a distal end of the trailing strip S ₂ in pinch roll 3 preparative upstream winding strip passing to the downstream side winding pinch rolls 5 and hence the downstream side winding device 6
This is a state that leads to the following. Here, strip S
Is 0.8 mm thick x 1000 mm wide, and the required unit tension to keep the strip from loosening is 2 kg / m
and m ^2.

After the tail end of the preceding strip S ₁ is cut by the strip shear 2, the leading end of the following strip S ₂ bites into the pinch roll 20 on the exit side of the strip shear 2 and is sucked by the high-speed passing device 17. While reaching the upstream winding pinch roll 3. In the case of a strip S having a thickness of 0.8 mm and a width of 1000 mm, the required unit tension is 2 kg / mm ² as described above, so that when converted to a tension T, T = 0.8 × 1000 × 2 = 1600 kg.

[0011] If no water film is present between the roll surface and the trailing strip S ₂ of the upper and lower pinch rolls 3 preparative upstream winding, upstream the winding because it is vertical respectively friction coefficient mu = 0.15 Force of the pinch roll 3 for use P = T / 2μ = 53
It becomes 33 kg. However, conventionally, since the pinch roll 3 preparative upstream winding is injected constantly coolant from the nozzle 21, to the tip of the leading strip S ₁ of the tail is missing then the trailing strip S ₂ enters upstream winding accumulate water between the pinch rolls 3 of the upper and lower rolls preparative, this result, the trailing strip S ₂ and the upstream side winding pinch rolls 3
A water film is formed between them and the friction coefficient μ is reduced to 0.05 or less.

For this reason, the tension between the upstream winding pinch roll 3 and the shearing-out pinch roll 20 is lost, and the slack is formed below the passing plate guide 13 on the entry side of the upstream winding pinch roll 3. This slack is propagated to the exit side of the upstream winding pinch roll 3 as it is, and in the worst case, the leading end of the succeeding strip S ₂ is moved to the gap between the upstream winding pinch roll 3 and the passing plate guide 14. The inconvenience of rushing into the device occurs.

Therefore, in this embodiment, when the leading end of the following strip S ₂ is passed through the upstream winding pinch roll 3, a water film is not formed on the upstream winding pinch roll 3. temporarily stopping the supply of cooling liquid to the upstream side winding pinch rolls 3, thereby, increases the friction coefficient μ between the trailing strip S ₂ and the upstream side winding pinch rolls 3 preparative, upstream preventing Clog tip line strip S ₂ after at eliminating slack in the plate at the entrance side of the pinch rolls 3 preparative side unwinding side of the pinch rolls 3 preparative the winding.

More specifically, the preceding strip S ₁ is generated by the strip shear 2 based on the position information and the like by the tracking means.
Before cutting the tail end of the _first strip S ₁ , the cooling liquid supply valve (not shown) of the nozzle 21 is turned off, and the tail end of the preceding strip S ₁ is cut by the strip shear 2 to remove the trailing strip S.
_{After 2} has passed the pinch roll 3 preparative upstream winding, the cooling liquid to the downstream side winding device winds 6 when the pinch rolls 3 preparative upstream winding to ON controls the coolant supply valve of the nozzle 21 at the same time Resume supply.

The preceding strip S _{1 in the} strip shear 2
The timing of turning off the coolant supply valve before cutting off the tail end of the head is determined in consideration of the time from when the valve is stopped to when the water from the header is completely drained. In this embodiment, the water volume of the header is 300 l / min,
Referring to FIG. 2, it took about 8 seconds from when the valve was stopped until no water came out of the header. Further, O valves 10 seconds before cutting the leading strip S ₁ of the tail by a strip shear 2 Considering a safety of 2 seconds in this embodiment
FF control was performed.

The warping of the tip of the line strip S ₂ after at the outlet side of the pinch rolls 3 preparative upstream winding 3 the height H shows the results of measurement at a high speed camera. Upstream Winding Pinch Roll 3
In the conventional example in which the cooling liquid is always supplied to
66 mm, and reached the height of the upper threading guide 14 or the triangular gate 23 on the exit side of the upstream winding pinch roll 3. On the other hand, in the example of the present invention in which the supply of the cooling liquid to the upstream winding pinch roll 3 was temporarily stopped, the warpage height H was ± 20 mm, and stable threading was possible.

In the above-described embodiment, a description has been given by taking as an example a countermeasure against a trouble caused by slippage between the upstream winding pinch roll 3 and the end of the strip. However, the present invention is not limited to this, and for example, a strip shear The pinch roll 20 and the downstream take-up pinch roll 5 arranged on the delivery side
It can also be applied to

[0018]

As is apparent from the above description, according to the present invention, it is possible to stably pass a strip with a pinch roll and to prevent the end of the strip from sticking. Can be

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a method of winding a strip as an example of an embodiment of the present invention.

FIG. 2 is a time chart for explaining ON-OFF timing of a coolant supply valve.

FIG. 3 is an explanatory diagram showing a warp height of a leading end of a trailing strip at an exit side of an upstream winding pinch roll.

FIG. 4 is a diagram schematically illustrating an example of an endless rolling line, and is an explanatory diagram illustrating a state in which a leading end of a first preceding strip is wound around an upstream winding device.

FIG. 5 schematically illustrates an example of an endless rolling line, and is an explanatory diagram illustrating a state after a leading end of a first preceding strip is wound around an upstream winding device.

FIG. 6 is an explanatory diagram for explaining a problem when a strip is passed by an upstream winding pinch roll.

[Explanation of symbols]

S ₁ : Leading strip S ₂ : Trailing strip 1: Finishing rolling mill 2 ... Strip shear 3 ... Pinch roll for upstream winding 4 ... Pinch roll for upstream winding 5 ... Pinch roll for downstream winding 6 ... Downstream winding Picking device 21 ... Nozzle

Claims (2)

[Claims] 1. A method of cutting a strip sent from a rolling mill into a predetermined length by a strip shear, and winding the cut strip by a plurality of winding devices via a pinch roll, Wherein the supply of the cooling liquid to the pinch roll is stopped so that a water film is not formed on the pinch roll when the leading end of the strip is passed by the pinch roll. 2. A method of cutting a strip sent from a rolling mill into a predetermined length by a strip shear and winding the cut strip by a plurality of winding devices via a winding pinch roll. After cutting the tail end of the preceding strip wound by the upstream winding device via the upstream winding pinch roll with a strip shear, the subsequent strip is wound downstream via the downstream winding pinch roll. If you take it up with the device,
When passing the leading end of the following strip with the upstream winding pinch roll, supply of the cooling liquid to the upstream winding pinch roll is performed so that a water film is not formed on the upstream winding pinch roll. A method for winding a strip, comprising stopping.