JPS6261729A - Complex straightener for small diameter roll group - Google Patents

Abstract

PURPOSE:To straighten the deformation in the steel plate width direction and to obtain a flat steel plate by performing the rolling reduction of No.1 and 3 rolls simultaneously by arranging No.1 roll at the inlet port side of a strip on the upper part and by arranging the distance with No. 2, 3 rolls larger than the roll distance on and after No. 4. CONSTITUTION:The pitch P3 of a roll 1 and roll 3 and the pitch P2 of a roll 2 and roll 4 are made larger than the respective pitch P1 from the roll 3 upto roll 10. And P3 is taken as per P3>1.1XP1, and P2 is determined so that the roll 2 is located at the center of the roll 1 and 3. The deflection in the width direction of a strip 12 is then straightened with the simultaneous strong rolling reduction of the roll 1 and 3.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a strip straightening machine, which has a mechanism suitable for achieving flatness in the width direction of a steel plate, and which has a group of small diameters having the same diameter. This invention relates to a composite straightening machine consisting of rolls.

[Background of the invention]

Conventional strip straightening machines are equipped with a low/V straightening machine that uses light pressure to correct warpage in the longitudinal direction, and a straightening machine that uses heavy pressure to correct warpage in the width direction.

Recently, a compound straightening machine (for example, 1 Invention Society Publication No. 83-99451) has been devised, which has a group of large diameter rolls under heavy pressure at the front and a group of small diameter rolls under light pressure at the rear.

In both cases, the wrapping angle was increased by applying one strong reduction, and large plastic elongation was generated to correct the warpage. The steepness of the strip is not constant, and even if the wrapping angle is determined by strong rolling, the wrapping angle of the rolled roll and the pair of rolls that sandwich the strip is determined by the arrangement of the next roll. However, it had the disadvantage that it could not provide a certain level of corrective effect. In addition, since the small diameter roll group and the large diameter roll group are separated, the structure and adjustment are complicated and the space is also taken up.

[Purpose of the invention]

An object of the present invention is to provide a strip straightening machine for a single roll group consisting of a plurality of rolls having relatively small diameters and the same diameter. is to provide.

[Summary of the invention]

Conventionally, it has been found that smaller diameter rolls are more advantageous for straightening strips, so rolls of about the same diameter are added to the group of small diameter rolls used to straighten warpage in the longitudinal direction of strips under light pressure. The idea was to correct warpage and unevenness in the width direction by increasing the width and applying strong pressure to it.

On the other hand, when the strip is miniaturized using the straightening machine shown in Fig. 1, roll 1. 2. 3 pitch Ps.

Set Pl larger than the pitch P+ of rolls 3 to 10,
P3. As a result of changing Pat, it was observed that the correction effect was large in any region of pitch P3.

Conventionally, it was thought that the pitch of the straightening machine should be L1 times the roll diameter, but with the roll arrangement shown in Figure 1, the roll pitch of the roll that controls warping in the width direction of the strip under strong pressure is Although it varies depending on the plate thickness, the roll diameter is 1.
It was found that there are areas where the correction effect is more than 1 times greater.

As described above, the present invention was made based on the discovery of a new phenomenon and the demands of the market.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1st
The figure shows a strip complex straightening machine consisting only of small-diameter rolls, in which the pitch PSs of rolls 1 and 3 and the pitch P2 of rolls 2 and 4 are larger than the respective pitches P1 of rolls 3 to 10. . Although it varies depending on the thickness of the strip, (Ps > 1.IXP+
) as <Ps, and roll 2 is located at the center of rolls 1 and 3, such that P! Establish.

Rolls 1 and 3 simultaneously apply strong pressure to correct warpage in the width direction of the strip. In this case, the roll 5 bends the strip 12 in the direction of the roll 4, and the strip 12
Since the contact angle with roll 4 becomes large, rolls 1 and 2
When the amount of warpage in the width direction of the incoming strip is trough-like and large, it is effective to correct this and make it flat. If the warp in the width direction of the strip is mountain-like, roll 5 A flat strip can be obtained by reducing the rolling reduction and reducing the contact angle between the roll 4 and the strip 12.

As described above, according to the present invention, deformation of a steel plate, particularly in the width direction, can be corrected, and a steel plate with good flatness can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the roll arrangement of a composite straightening machine comprising a plurality of small diameter rolls according to the present invention. 1...1st roll, 2...2nd roll, 3...3
No. roll, 4... No. 4 roll, 5... No. 5 roll,
6...6th roll, 7...7th roll, 8...8
No. roll, 9... No. 9 roll, 10... No. 10 roll, 11... Pitch roll, 12... Strip.

Claims (1)

[Claims] 1. In a straightening machine consisting of a plurality of rolls arranged in a staggered manner, the first roll on the strip entrance side is placed at the top, and the distance between the centers of the second (lower) and third (upper) rolls is 4. By having a combination of rolls arranged with a distance larger than the distance between the centers of the subsequent rolls, and by performing parallel rolling on the first and third rolls at the same time, it is possible to maintain the flatness in the width direction below a predetermined value, and at the same time in the longitudinal direction. This is a small-diameter roll group compound straightening machine that can correct the deformation of strips.