JPH05269524A - Pinch roll excellent in prevention of linear mark having chattering property from being generated - Google Patents

Abstract

PURPOSE:To provide a pinch roll which can reduce chattering produced when a strip is coiled at a high speed and to prevent a linear mark by chattering property effectively from being generated. CONSTITUTION:Circular notch part 3 like a circle at whose center a roll axis is placed are provided on both sides of a roll barrel part 1 to reduce the weight of the roll body and to diminish GD<2> when it rotates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roll of a strip winding device capable of effectively preventing the generation of chattering linear marks during high speed winding of a strip.

[0002]

2. Description of the Related Art FIG. 5 is a schematic view of a strip winding device used for a heat treatment line for steel plates and the like, and FIG. 6 is a detailed view of a portion D in the previous figure.

Conventionally, a strip winding device used in a heat treatment line for a steel sheet, etc., comprises an upper pinch roll 6, a lower pinch roll 7 and a mandrel 8 as shown in the drawing. , 7 are guided by the mandrel 8 and wound while maintaining a constant tension between the finishing stand and the pinch rolls 6, 7.

[Problems to be Solved by the Invention]

By the way, at the time of winding work of such a strip winding device, especially at the time of winding a thin sheet narrow material,
In many cases, a linear mark was generated in the central portion on the tail end side of the strip due to chattering caused by pinch rolls.
For example, at the time of high-speed winding with a plate thickness of 1.2 to 1.6 mm and a plate width of 3 to 4 width, after the strip tail end side has passed through the finishing stand, as shown in FIG. Width: 150 to 160 mm, pitch: 2.5 to 6.14 mm linear marks are generated.

If such a linear mark is so small as to be recognized for the first time in a choke test after winding, it disappears in the pickling line in the next step, but it is not a problem, but as shown in FIG. The remarkable marks that are clearly recognized by visual inspection remain after the pickling and after the plating, and there is a problem that the commercial value thereof is significantly reduced. Therefore, in the past, the strip passing speed was limited in order to prevent the generation of the linear mark, but in such a line, there is a problem that the strip production efficiency cannot be improved as expected due to the speed limitation. It was happening.

The present invention was devised in view of the above problems. Since the linear marks are generated by chattering of the pinch rolls, the invention was devised especially as a result of focusing on the pinch rolls. An object of the present invention is to provide a pinch roll of a winding device that can effectively prevent the generation of chattering linear marks during winding.

[0007]

The linear marks generated during high-speed winding of the strip are considered to be caused by the chattering of the pinch rolls as described above.

On the basis of such points, the present inventors have
As a result of various studies to prevent chattering of the pinch roll, it was noted that the ^second moment of inertia of the pinch roll (hereinafter simply referred to as GD ² ) should be reduced in order to reduce chattering.

To reduce the GD ² of pinch rolls,
First, it is conceivable to reduce the roll diameter. Therefore, the present inventors measured the linear mark occurrence rate by changing the diameter of the lower pinch roll of the high-speed winding device in the hot steel plate processing line under the following conditions, and investigated the relationship.

Strip: thickness 1.2 to 1.6 mm, width 3 to 4 width plate speed: 800 m / min

The results are shown in FIG. 4, where the roll diameter is 452.
It can be seen that the linear mark generation rate becomes 0 at 5 mm or less.

Therefore, if the roll diameter is made as small as possible, it is possible to suppress the generation of linear marks. On the other hand, if the roll diameter is made smaller, the roll wear frequency increases, and replacement of the roll mark It may be unfavorable for roll management due to increased frequency.

Therefore, the present inventors have come up with the present invention as a pinch roll capable of reducing GD ² while minimizing the reduction in the diameter of the roll, in which the weight of the body portion is reduced.

That is, the pinch roll according to the present invention is
First, a notch is provided in a part of the body to reduce the weight of the roll and reduce GD ² . Further, it is of course possible to form a through hole penetrating the body portion along the axial direction or make the body portion hollow so as to reduce the weight of the roll.

[0015]

In the pinch roll according to the present invention, a notch is provided in a part of the body, a through hole is formed in the body along the axial direction, and the body is hollow. Therefore, the weight of the roll body is reduced by the amount of the notch, the through hole, or the hollow part, and GD ² at the time of roll rotation can be reduced without reducing the roll diameter. It can be reduced.

Therefore, by reducing the GD ^{2 of} the pinch roll, chattering caused by the roll can be reduced, and by extension, the generation of the chattering linear mark can be effectively prevented.

[0017]

Embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following examples.

FIG. 1 shows an embodiment of the pinch roll according to the present invention. In this embodiment, as shown in the drawing, a circular notch 3 centered on the roll axis is formed on both side surfaces 2 of the roll body 1.
Is provided.

FIG. 2 shows another embodiment of the present invention. In the present embodiment, as shown in the drawing, the through hole 4 penetrating in the roll body 1 along the roll axial direction is on the circumference around the roll axis and the axis is the target point. There are multiple holes.

FIG. 3 shows another embodiment of the present invention. In this embodiment, as shown in the figure, a hollow portion 5 is provided in the center of the roll body 1.

As described above, the notch 3 is provided in the first embodiment, the through hole 4 is provided in the second embodiment, and the hollow portion 5 is provided in the third embodiment. Since they are provided, the weight of the roll main body is reduced by the notch 3, the through hole 4, or the hollow portion 5, respectively. Therefore, when the above embodiment is used as the pinch roll of the winding device, the roll GD ² is reduced,
Since chattering due to rolls can be reduced, the occurrence of chattering linear marks can be effectively prevented.

Next, a test example of the above embodiment will be shown.

Under the same conditions as in the test example of the conventional roll shown in FIG. 4 described above, the first embodiment is used as the lower pinch roll of the high-speed winding device in the hot steel plate processing line, and GD ² and the wire at the time of roll rotation are used. The rate of occurrence of the circular marks was measured. As a result, when the roll diameter was 465 mm, the GD ² value was 9500 kgf · m ^{2 and} the generation of linear marks was 0. In the test example of the conventional roll shown in FIG. 4, when the roll diameter is 465 mm, the GD ² value is 10534 kgf · m ² , and the linear mark occurrence rate is about 85%. It can be seen that the roll is excellent in preventing the generation of linear marks. Further, in the test example shown in FIG. 4, the generation of linear marks is 0 when the roll diameter is 452.
In contrast to the time when the roll diameter is 5 mm or less, in the present embodiment, the generation of the linear mark is 0 when the roll diameter is 465 mm as described above. Therefore, according to the roll of the present embodiment, the roll diameter can be kept relatively large as compared with the conventional roll, and conversely, the generation of the linear marks can be suppressed without reducing the diameter. I can see it.

[0024]

As described above, according to the pinch roll of the present invention, it is possible to reduce chattering that occurs during high-speed winding of a strip and effectively prevent the generation of chattering linear marks. Is becoming

[Brief description of drawings]

FIG. 1 shows a first embodiment of a pinch roll according to the present invention, (a) is a front view thereof, and (b) is a sectional view taken along the line AA in (a).

FIG. 2 shows a second embodiment of the pinch roll according to the present invention, (a) is a front view thereof, and (b) is a sectional view taken along line BB in (a).

FIG. 3 shows a third embodiment of the pinch roll according to the present invention, (a) is a front view thereof, and (b) is a sectional view taken along line CC of (a).

[Fig. 4] G of various conventional pinch rolls with various diameters
Is a graph showing test results obtained by measuring the D ² and the linear mark incidence.

FIG. 5 is a schematic view showing a strip winding device used in a heat treatment line for steel plates and the like.

FIG. 6 is a detailed view of a portion D in FIG.

FIG. 7 is an explanatory diagram of a chattering linear mark,
(a) is an explanatory view of the tail end side of the strip, and (b) is a detailed view of an E portion in (a).

[Explanation of symbols]

 1 Roll Body 2 Roll Side 3 Notch 4 Through Hole 5 Hollow 6 Upper Pinch Roll 7 Lower Pinch Roll 8 Mandrel 9 Strip

Claims (3)

[Claims] 1. A pinch roll excellent in prevention of chattering linear marks, characterized in that a notch is provided in a part of its body. 2. A pinch roll excellent in preventing the occurrence of chattering linear marks, characterized in that a through hole penetrating along the axial direction is formed in the body portion. 3. A pinch roll excellent in prevention of chattering linear marks, characterized in that its body is hollow.