JPS6393430A - Flatness correcting device for tension leveler - Google Patents

Abstract

PURPOSE:To stably obtain a metal strip having good flatness by providing movably in an axial direction the extension roll having a crowning at an opposite end part, a pressing roll and deflector roll at the front and back thereof by pinching the metal strip. CONSTITUTION:In the flatness correcting device of a tension leveler correcting he defective flatness of a metal strip, the extension roll 1 providing a crowning whose diameter is reduced toward an opposite end part each other by pinching the metal strip 5 and a pressing roll 2 are provided. Before and behind said pressing roll 2, a pair of deflector rolls 31 having the crowning in the direction same therewith are arranged. Said each roll 1, 2, 31 is positioned according to the plat width of the metal strip 5 by moving it in the axial direction adequately. the metal strip 5 is then pressed between an extension roll 1 and pressing roll 2 by driving cylinders 91, 92 and optimum tension is applied as well. The plate center part 5b and both end parts 5a, 5c of the metal strip 5 are thus elongated uniformly and straightened equally.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a tension leveler that corrects flatness defects in a metal strip using a combined stress of tension and bending, and particularly to a tension leveler that corrects flatness defects at the width ends of a metal strip. This invention relates to a flatness correction device for a flattening leveler.

<Prior art> A tension leveler applies a combined stress due to tension and bending to the metal strip of the material to be straightened, and brings the metal strip to zero.
．． This device corrects flatness defects by stretching the sheet by 2 to 1.5%.

However, when a metal strip is bent and stretched along a bending roll in this way, the width edges of the metal strip are not constrained in the width direction compared to the center of the sheet width, and in some cases, the center of one width of the sheet is Due to reasons such as the yield stress near the width edges being lower than the yield stress at the width edges, the elongation at the width edges is slightly greater than at the center. Poor flatness remains, hindering improvements in product precision and yield.

One of the techniques to solve this problem is the side view shown in Figure 4 and the side view shown in Figure 5.
There is a technique shown in the top view of the figure.

This technology includes a stretching roll 1 and a presser roll 2@Q, and each of the two rolls 1 and 2 is provided with a crowning at one end opposite to each other, the diameter of which decreases toward the end of the roll, and each of the crowning parts is made of metal. Width end portion 5a of strip 5.

Move the two rolls 1 and 2 in the axial direction so that they touch the metal striker 5C.
The tightening steps a and 5c are intended to reduce stress in the plate thickness direction due to force, equalize elongation over the entire width of the plate, and obtain a flat metal strip.

<Problems to be Solved by the Invention> However, in this method, as shown in FIG. The width end 5a of the crowned side of the roll 2 is the same and the tension in the longitudinal direction is also the same, but the width end 5C passing through the crowning part of the elongated roll 1 runs along the crowning part, so The threading length is shorter than that of the portions 5n and 5b, and the tension is relaxed.

Therefore, the tension at both width ends 5a, 5c is different, and even if the tightening force of the metal strip 5 by the extension roll 1 and the press roll 2 is adjusted, the flatness of both width ends 5a, 5c is maintained at the same time. The problem is that it cannot be corrected.

In order to solve this problem, when tightening the metal strip with an elongated roll and a press roll, the force is symmetrical with respect to the center of the strip width. It is effective to make the threading length of metal strips and strips symmetrical with respect to the center of the board width without impairing the function of reducing force.

Means for Solving Problems> The configuration of the present invention for solving problem 1 above is a flatness correction device for a tensile leveler that corrects poor flatness of a metal strip. A roll and a presser roll are provided, each of the stretching roll and the presser roll is provided with a crowning at one end opposite to each other, the diameter of which decreases toward the roll end, and deflector rolls are provided before and after the presser roll, the deflector roll is provided with a crowning whose diameter decreases toward the end of the roll at one end on the same side as the crowned side of the presser roll, and a roll group consisting of the deflector roll and the presser roll and the elongation roll are respectively attached to the axis. It is characterized by providing means for moving in the direction.

The width end of one side of the metal strip that passes through the crowning part of the stretching roll and the width end of the other side of the metal strip that passes through the crowning part of the presser roll are at different height positions. , the width end portions on the other side are parallel to each other by following the crowning portion of the deflector roll, and the threading lengths of both width end portions are symmetrical.

Furthermore, since the tension at both width ends of the metal strip is relaxed, the flatness can be substantially corrected without tightening the metal strip with a press roll.

In addition, since the flatness, thickness, yield point, etc. of metal slips usually change in the longitudinal direction, in order to cope with this, each roll is moved in the axial direction during sheet threading. If you try to adjust it, there is a risk of applying force to the metal strip in the width direction and causing it to meander, and if you try to rapidly move the roll in the axial direction, the equipment will become enormous and costs will increase. There's a problem. However, in the present invention, the metal strip is tightened by the presser roll by simply changing the force, so that the above-mentioned problem does not occur and the elongation of the width end portion and the center portion can be easily and responsively made equal.

In addition, if the push roll and deflector roll are moved in the axial direction with -g\, the crown knob portion of the roll will not shift and stable operation can be achieved at all times.

Embodiment Example An embodiment of the present invention will be described below based on FIG. 1 which is a side view of a roll arrangement, FIG. 2 which is a plan view, and FIG. 3 which is a plan view of an axial movement device for presser rolls. I will explain.

In FIG. 1, a metal strip 5 is bent and stretched onto a stretching roll 1 which is crowned with a diameter decreasing towards the end of the roll. On the opposite side of the elongating roll 1, sandwiching the metal strigo 5, there is provided a presser roll 2, which is similarly crowned at the other end and whose diameter decreases toward the end of the roll.
. At the same time, deflation crawls 31 are provided before and after the presser roll 20, which are crowned with a diameter decreasing toward the end of the roll at the same end where the presser roll 2 is crowned. Move the same distance in the same direction as Push Nine Roll 2. In this state, the deflation crawler 31 is pushed up with the shilling 91 and the metal strip 5 is moved to the elongated roll 1.
along with the presser roll 2 is pushed up by the cylinder 92 and the metal sheet is moved by the presser roll 2 and the extension roll 1);
Apply compressive stress to the lip 5 in the thickness direction.

In addition, since the elongating roll 1 is generally used with a small diameter, in the embodiment of the present invention, t: elongating roll 1 is used to prevent deflection.
is supported by two reinforcing rolls 4, but even if the number of reinforcing rolls is further increased or, if the load is small, even if the reinforcing rolls 4 are omitted, the roundness will not be compromised.

Also, if you use a small diameter one for the presser roll 2 (if you use it,
Even if the pressed round roll 2 is supported by a reinforcing roll, it will not become round at all.

FIG. 2 is a plan view of an embodiment in which the reinforcing roll and roll neck portion of FIG. This is a state in which they have moved in opposite directions.

FIG. 3 shows a plan view of one embodiment of an axial movement device for the presser roll 2, in which radial bearings 6 are provided on both side roll necks of the presser roll 2, and 50 metal strips are mounted on the presser roll 2. Movement in the plate direction is stopped by the housing 8. The pressed round roll 2 has one end on the pressed round roll 2.
A thrust bearing 61 is provided to move the shaft in the axial direction,
The press roll 2 is pushed and pulled by a cylinder 9 via the bearing 6] and a bearing presser 7. Since the moving equipment of the elongating roll 1 and the deflation crawler 31 is the same, illustrations thereof are omitted. Note that the roll pushing/pulling is not limited to shilling, and may also be a method of rotating a screw nut, or a method of pushing both ends of the roll alternately instead of pushing/pulling only one end, and various known techniques can be used.

<Effects of the Invention> As described above, according to the present invention, the running length of the metal strip can always be kept constant over the entire width within the flatness correction device. Tightening with a presser roll requires only a small amount of force, and even if the flatness, thickness, yield point, etc. of the metal strip change in the longitudinal direction, this fastening can be done instantly by simply adjusting the force. :It is possible to stably obtain metal strips with good flatness.Furthermore, even if metal strings with different strip widths are continuously flowing, each roll is moved in the axial direction, and the force is applied when giving up. This can be easily handled by simply changing to a predetermined value. Therefore, it is possible to realize profits due to extremely large improvements in product precision and productivity.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, where the first section is a side view of the roll arrangement, Figure 2 is a plan view of Figure 1, and Figure 3 is a view of the presser roll. A plan view of the axial movement device, FIG. 4 is a side view of a conventional example, and FIG. 5 is a plan view related to FIG. 4. Also, the symbols in the figure are: 1 is an extension roll, 2 is a presser roll, 3.31 is a deflation roll, 4 is a reinforcing roll, 5 is a metal strip, 6.61 is a roll bearing, 7 is a bearing pusher, 8 is the housing, 9.91, 92 is the shilling, 10,
101 and 102 are bearing support frames. Patent applicant: Mitsubishi Heavy Industries, Ltd., acting agent

Claims (1)

[Claims] In a flatness correction device for a tension leveler that corrects flatness defects in a metal strip, a stretching roll and a presser roll are provided to sandwich the metal strip, and the stretching roll and the presser roll are arranged at one end of the roll at opposite positions to each other. A crowning whose diameter decreases toward the roll end is provided, and a deflector roll is provided before and after the presser roll, and the deflector roll has a diameter decreasing toward the roll end at one end on the same side as the crowned side of the presser roll. 1. A flatness correction device for a tension leveler, characterized in that a device is provided with a crowning and means for moving each of the roll group consisting of the deflector roll and the presser roll and the elongation roll in the axial direction.