JPH0659482B2 - Strip - Google Patents

Description

TECHNICAL FIELD The present invention relates to a strip edger for performing width reduction between stands of a finish rolling mill.

[Prior Art] Conventionally, the width reduction of a rolled material is generally performed by an edger provided near the rough rolling machine on the upstream side of the rolling line. However, if the width reduction is performed on the upstream side of the rolling line, the thickness reduction performed on the downstream side of the rolling line causes edge drops at the material edges and the strip cross-sectional shape deteriorates. There has been a problem that the error of the obtained plate width increases and the plate width accuracy decreases. Therefore, in recent years, it has been studied to perform width reduction between finishing stands on the downstream side of the rolling line to improve the cross-sectional shape and width accuracy of the strip.

[Problems to be Solved by the Invention] However, when the edger is provided between the finishing stands to perform the width reduction, the strip becomes thinner due to the thickness reduction on the upstream side. Buckling may occur.

The present invention has been made in view of the above circumstances, and an object thereof is to enable width reduction of a thin object without buckling.

[Means for Solving Problems] The present invention is intended to solve the above technical problems,
An edger for reducing the width of the strip is provided between the finish rolling mill stands, and an upper pressing roll that presses the upper surface of the strip is provided at a position near the roll gap of the edger, and the upper pressing roll and the strip upstream rolling mill stand are provided. A looper roll that pushes the strip upward is provided between the strip and a strip push-up roll that pushes the strip upward between the upper press roll and the strip downstream rolling mill stand, and the strip is wound around the upper press roll. The present invention relates to a strip edger characterized by being configured to maintain a large attachment angle.

[Operation] Therefore, in the present invention, with respect to the upper presser roll provided in the vicinity of the roll gap of the edger, the strip is pushed up by a large wrapping angle by the strip push-up action of the looper roll and the strip push-up roll provided on the upper and downstream sides. With the winding angle and the tension of the strip, the apparent rigidity of the strip can be increased, and the width reduction can be performed while suppressing the occurrence of buckling.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which the width of the strip 3 is adjusted by pressing the edger rolls 4,5 on both width ends of the strip 3 between the rolling mill stands 1 and 2 for finish rolling. There is an edger 6 that performs reduction.

In the roll gap of the edger rolls 4 and 5 of the above-mentioned edger 6, an upper presser roll 7 for pressing the upper surface of the strip 3 is provided, and further between the upper presser roll 7 and the rolling mill stand 1 on the upstream side. A looper roll 9 is provided which pushes up the strip 3 by rotating the arm 8.

The looper roll 9 can adjust the looper angle θ by raising by an adjustment drive device 10 that rotates the arm 8.

Further, a strip push-up roll 12 is provided between the upper presser roll 7 and the rolling mill stand 2 on the downstream side so as to push the strip 3 upward by a lifting device 11 such as a hydraulic cylinder. The wrapping angle α of the strip 3 with respect to the upper pressing roll 7 can be kept large by the action of pushing up the strip 3 with the strip lifting roll 9 and the strip lifting roll 12.

In the above, when the adjustment drive device 10 increases the looper angle θ to raise the looper roll 9, the strip 3 on the upstream side of the upper presser roll 7 is pushed upward,
Further, when the strip lifting roll 12 is lifted by the lifting device 11, the strip 3 on the downstream side of the upper presser roll 7 is pushed upward, and thereby the winding angle α of the strip 3 with respect to the upper presser roll 7 is largely maintained. can do.

In this way, by giving a large wrapping angle α, the apparent rigidity of the strip 3 is increased in combination with the tension application of the strip 3, so that the strip 3 can be reduced even if the width reduction is performed by the edger 6. It is less likely to buckle, so edging with a thin object is possible, improving plate width accuracy,
Edge drop can be improved.

FIG. 3 shows the relationship between the winding angle α and the limit width reduction force at which the strip 3 buckles. The looper angle θ is increased to raise the looper roll 12 and the strip push-up roll. Ascending 12 and winding angle α
It is clear that the buckling is less likely to occur by increasing the.

The present invention is not limited to the above embodiment, and the position where the upper pressing roll presses the upper surface of the strip may be the roll gap part of the edger roll or a position near the roll gap, and the looper roll and the strip. The method of raising the lifting roll can be arbitrarily selected, and the shape of the upper pressing roll can be changed in various ways.
It goes without saying that other various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the strip edger of the present invention, the upper surface of the strip is pressed by the upper pressing roll in the vicinity of the roll gap of the edger roll that performs width reduction between the rolling mill stands, and the strip upstream side Is lifted by a looper roll, and the downstream side is lifted by a strip push-up roll to wind the strip around the upper press roll at a required large wrapping angle to reduce the width. The wrapping angle can increase the apparent rigidity of the strip and prevent buckling, thus enabling edging of thin objects, improving the plate width accuracy, and improving the edge drop. .

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
FIG. 3 is a plan view of the drawing, and FIG. 3 is a graph showing the relationship between the winding angle and the limit of the width reduction force that causes buckling. 1, 2 are rolling mill stands, 3 are strips, 4,5 are edger rolls, 6 are edgers, 7 are top rolls, 8 are arms, 9 are looper rolls, 10 are adjustment drives, 11 are lifting devices, 12 indicates a strip lifting roll.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Matoba 5-3 Tokai-cho, Tokai-shi, Aichi Prefecture Nippon Steel Co., Ltd. inside the Nagoya Works (72) Inventor Yasushi Igarashi 5 Tokai-cho, Tokai-shi, Aichi Prefecture No. 3 Shin Nippon Steel Co., Ltd. Nagoya Steel Works (56) References JP-A-59-70403 (JP, A)

Claims (1)

[Claims] 1. An edger for reducing the width of a strip is provided between stands of a finish rolling mill, an upper presser roll is provided for pressing an upper surface of the strip near a roll gap of the edger, and the upper presser roll and the strip upstream side. A looper roll that pushes the strip upwards is provided between the rolling mill stand and the strip, and a strip pushing roll that pushes the strip upwards is provided between the top pressing roll and the strip rolling mill stand. A strip edger configured to maintain a large wrapping angle of the strip with respect to the roll.