JPH0390215A - Method and device for straightening h-shape steel - Google Patents

Abstract

PURPOSE:To obtain the web height uniformized over the whole length by cold- rolling the webs at both ends in the lengthwise direction of a material to be straightened with a pair of facing rolling-down rolls on the outlet side of a roller straightening device. CONSTITUTION:On the outlet of the roller straightening device wherein plural rolls 2 are arranged alternately on both front and rear sides of the web along the lengthwise direction of the material 1 to be straightened of H-shape steel, both end parts in the lengthwise direction of the material 1 to be straightened is cold-rolled at least by a pair of facing rolling down rolls 3a, 3b. Consequently, the webs at both ends in the lengthwise direction of the material 1 to be straightened receives light rolling reduction, the web width is enlarged and the web height uniformized over the length is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a straightening method and apparatus for eliminating non-uniformity in web height that occurs in the longitudinal direction when roller straightening an H-section steel.

[Tsuchiki's technology]

Figure 4(a) and the same figure (b) showing the BB cross section are H
It is an explanatory view showing a method of roller straightening of a shaped steel (10).

In this roller straightening device, a plurality of rollers (2) are arranged vertically and alternately in the longitudinal direction of the H-shaped steel (10), and as shown in FIG. By applying bending moments in opposite directions alternately to the H-shaped steel (10) between the two, vertical bending of the H-shaped steel (10) is eliminated.

[Problem that the invention seeks to solve]

However, since the rolls (2) are arranged alternately, H
Shape 1 (10) It is difficult to apply a bending moment to both ends in the longitudinal direction, and the expected straightening effect cannot be obtained. Figures 5 (a) to (C) show the H shape with such roller straightening. It is a side view and a sectional view showing the state of the longitudinal direction web height H, web thickness, and T of steel (10).

In the longitudinal center part La of the H-beam steel (10), (a) and (b)
), an appropriate straightening effect is obtained, the web thickness Tai in the roll contact area is thinner than the nib thickness Ta2 in the non-contact area, and the web height Ha is increased accordingly. On the other hand, both longitudinal ends L of H-beam steel (10)
As shown in Figures (a) and (b), there is no straightening effect in case b, so the web thickness Tb is approximately uniform within the same cross section, and the web height Hb is almost equal to that before straightening. no change.

The present invention has been made in order to solve the problem in the conventional roller straightening technique that the web height differs between both longitudinal ends of the H-shaped steel and the center after straightening. The object of the present invention is to provide a correction method and device for obtaining a product with uniform overall length.

[Means for solving problems]

Therefore, the method for straightening H-beam steel according to the present invention is as shown in FIG. 1(a) and FIG.
At least one pair (only one pair is shown in the drawing) on the exit side of a roller straightening device in which a plurality of rolls (2) are arranged alternately on the front and back surfaces of the web along the longitudinal direction of the material to be straightened (1), which is an H-shaped steel. ) The basic feature is that both longitudinal ends of the material to be straightened (1) are cold rolled by opposing reduction rolls (3a) and (3b).

Through such rolling, a slight reduction is applied to the web at both longitudinal ends of the material to be straightened (1), which had no straightening effect until now, and
The width of the web is widened so that a uniform web height can be obtained over the entire length.

Further, the second invention relates to an apparatus for carrying out such a straightening method, and is a roller straightening apparatus in which a plurality of rolls (2) are arranged alternately on the front and back sides of the web along the longitudinal direction of the material to be straightened (1). At least a pair of roll-down rolls (3a) whose centers are aligned on the same line in a direction orthogonal to the web surface on the exit side of the web.
(3b) is arranged.

This arrangement of the reduction rolls (3a) and (3b) makes it possible to apply light reduction to the web at both longitudinal ends of the material to be straightened (1). In addition, the reduction rolls (3a) (3b
), it is preferable to use a roll having a similar shape to the roll (2) on the roll straightening device side.

〔Example〕

Specific examples of the present invention will be described below.

A plurality of straightening rolls (2) as shown in FIG. 1(a)
A pair of roll-down rolls (30) and (31) having a similar shape to the straightening roll (2) of the straightening device were arranged at the same vertical position on the exit side of a roller straightening device in which rollers were arranged alternately in the upper and lower directions.

These reduction rolls (30) and (31) are shown in FIGS.
), it is supported by one rolling stand. The stand connects the reduction roll (3) to roll chocks (33) (34) provided in the housing (32).
0) The roll shaft of (31) is pivotally supported, and the rolling down is adjusted by pressing the roll chocks (33) and (34) in the vertical direction with a rolling down device (35) and a seating device (36). The configuration is such that this is possible. Between these reduction rolls (30) (31), an H-beam (10)
When the longitudinal ends are bitten and a reduction is applied to the web, it will be in a state as shown in Figure (b).

In the figure, (37) and (38) are roll balancers for the upper and lower rolls (30).

In this embodiment, when the roller straightening device performs straightening, the tip of the H-beam (10) is the last straightening roll (2).
) and entered between the upper and lower roll-down rolls (30) (31), the roll-down rolls (30) and (31)
A light reduction is applied to perform cold rolling. After that, while the center of the H-shaped steel (10) moves.

Rolling by the reduction rolls (30) and (31) is not performed,
When the rear end of the H-section steel (10) passes through, the reduction rolls (30) and (31) apply a light reduction to that part again to perform cold rolling.

As a result, H-shaped steel (10), which had no straightening effect until now,
Among the webs at both ends in the longitudinal direction, the reduction roll (30)
(31) Light reduction is applied to the contact area to make it thinner.

The web height was increased accordingly.

FIGS. 3(a) and 3(b) are graphs showing the amount of change in web height (ΔH) before and after roller correction when the conventional correction method and the method of this embodiment are implemented. The same figure (
a) Web height 300m, flange height 30 (1m,
Frequency appearance rate (
%), and the same figure (b) shows a web height of 700mm, a flange height of 300mm, and a web thickness/flange thickness of 13m++.
* The frequency appearance rate of the web height change of 150 H-beam steels of 24- is shown, and in both figures, the left side shows the web height change when the conventional straightening method is applied, and the right side shows the web height change when the conventional straightening method is applied. 3 shows the amount of change in web height when the method of this embodiment is implemented.

In both figures, when the conventional straightening method is implemented, the web height change at the longitudinal center of the H-section steel is 1.4 m to 1.6 m.
In contrast, those at both ends in the longitudinal direction are concentrated at 0.1 m and 0.2 mm, indicating that almost no correction effect is obtained at both ends. On the other hand, in the case of the method of this embodiment, the amount of change in web height at both the longitudinal center and both ends of the H-beam is from 1.2 m to 1.8 m.
A product with a substantially uniform web height over the entire length was obtained.

〔Effect of the invention〕

As described in detail above, according to the method of the present invention and the apparatus for implementing the method, it is possible to obtain a straightened H-section steel having a uniform web height over its entire length. Furthermore, since the apparatus of the present invention is configured simply by disposing rolling rolls on the exit side of the roller straightening machine, it can be applied to existing roller straightening machines without requiring any changes.

[Brief explanation of drawings]

Figure 1 (,) is an explanatory diagram showing the basic configuration of the present invention;
b) is a sectional view taken along the line A-A in FIG. 1(a), and FIG. 2(a) is a side view showing the configuration of a rolling stand provided on the exit side of the roller straightening device in an embodiment of the present invention; (b) is a front view thereof, FIGS. 3(a) and 3(b) are graphs showing the amount of change in web height after roller straightening obtained when implementing the method of this embodiment and the conventional method. Figure (a) is an explanatory diagram of the conventional roller straightening method, figure (b) is a sectional view taken along line B-B in figure 4 (a), and figure 5 (a) is an illustration of the conventional roller straightening method. Side views of the H-shaped steel, Figures (b) and (c) are cross-sectional views at various parts in the longitudinal direction of the H-shaped steel. In the figure, (1) shows the material to be straightened, (10) shows the H-shaped steel, (2) shows the straightening roll, and (3a), (3b), (30), and (31) show the reduction rolls. Procedural amendment (voluntary) October 1989 Ushihi

Claims (2)

[Claims] (1) At the exit side of a roller straightening device in which a plurality of rolls are arranged alternately on the front and back sides of the web along the longitudinal direction of the material to be straightened, the web at both ends in the longitudinal direction of the material to be straightened is H characterized by cold rolling
Straightening method for shaped steel. (2) On the exit side of a roller straightening device in which a plurality of rolls are arranged alternately on the front and back surfaces of the web along the longitudinal direction of the material to be straightened, at least one pair of rolls are aligned on the same line in a direction orthogonal to the web surface. A straightening device for H-beam steel, characterized in that it is equipped with reduction rolls.