JPH01113123A - Method for straightening rectangularity of flange of h-shape steel - Google Patents

Abstract

PURPOSE:To improve the straightening accuracy and the quality of H-shape steel by changing a thrusting amount in the lengthwise direction of material when the poor rectangularity of a flange is straightened by thrusting rolls having independent rolling reduction equipments. CONSTITUTION:The chocks 4, 4' of the rolls 2, 2' to thrust the flange are supported by a frame 6 through pins 5, 5'. The frame 6 is supported by a balance cylinder 8 and the rolling reduction equipments 9, 9' and the frame 6 can be inclined by changing the thrusting amount of the rolling reduction equipments 9, 9'. The control of a straightening machine is performed by tracking the lengthwise position of a material 1 to be straightened in the position of the thrusting roll and changing the thrusting controlled variable according to the lengthwise position. Since the controlled variable in the lengthwise direction of the material 1 to be straightened is controlled accurately by the rolling reduction equipments 9, 9', the rectangularity of the flange is uniformized and the straightening accuracy and the quality of H-shape steel are improved.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Field of Application The present invention relates to a method for correcting the flange squareness of an H-section steel, and more particularly, the present invention relates to a method for correcting the flange squareness of an H-section steel. Pertains to.

Conventional Technology H-section steel is generally hot-formed using a universal mill equipped with upper and lower horizontal rolls and vertical rolls on the same axis. After rolling, the hot-formed H-section steel is subjected to a cold section, and warps and bends occurring in the cold section are corrected by a roller straightening machine.

However, because the upper and lower horizontal rolls move in the roll axis direction due to play or elastic deformation during rolling, the thickness may differ between the upper, lower, left, and right sides of the flange. Further, temperature differences occur due to temperature differences between the inner and outer surfaces of the flange, differences in cooling process, and differences in thickness between the base of the wear and the flange and the flange portion.

As a result, cold F! JII H-beam steel tends to suffer from squareness defects, as shown in Figure 4. These deformations cannot be corrected with a roller straightening machine, so press straightening or heating straightening is performed. However, these operations all depend on the sensitivity of the operator, so it is difficult to improve workability, productivity, labor saving,
This is a big problem in terms of quality.

On the other hand, an online method for correcting the perpendicularity is to press the outside of the flange with a roller (Japanese Patent Publication No. 55-3
No. 0923) has been proposed, but this is effective for correcting bent flanges (see Figure 4 (C1, (1))), but it is effective for correcting flange bends (Figure 4 (1a), (1)). (See) Not very effective for correction. In addition, when straightening is performed by pushing the outside of the flange as shown in Fig. 5, the degree of influence of the amount of pushing on the material is different between the front and rear ends and the steady part.
There is a problem that a uniform correction effect cannot be achieved in the longitudinal direction. Figure 6 shows the shape of the flange before and after correction when the flange pushing skewer is kept constant. You can see that it has a shape.

Problems to be Solved by the Invention The present invention aims to solve these problems, and specifically, by changing the pushing width of the pushing roll in the longitudinal direction, the perpendicularity of the material in the longitudinal direction is uniformly corrected. The purpose of this invention is to provide a method for straightening a flange of a section steel.

<Structure of the Invention> As a means for solving the problem, the present invention provides a straightening device for correcting flange perpendicularity of an H-section steel, in which the amount of push in the longitudinal direction of the material being straightened is reduced. It is characterized by uniformly correcting the perpendicularity in the longitudinal direction by changing the angle.

Hereinafter, the structure and operation of the means of the present invention will be explained with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of a squareness straightening machine according to the present invention,
FIG. 2 is a control block diagram of the high-angle straightening machine according to the present invention, and FIG. 3 is a graph showing the straightening effect of the high-angle straightening machine of the present invention. , Figure 4 ial, (old, tar, fd
) and +I3+ are explanatory diagrams showing examples of poor flange squareness, respectively, FIG. 5 is an explanatory diagram of a conventional straightening machine using flange pushing, and FIG.
It is a graph showing the amount of longitudinal flange deformation at a constant value.

FIG. 1 shows a specific example of the configuration of a straightening machine necessary to carry out the present invention. Reference numeral 1 denotes a material to be straightened, and 2.2' denotes a flange pushing roll, which is held by a chock 4.4'. The chock 4.4' is supported on the frame 6 by means of a pin 5.5', and by actuating the cylinder 7 the relative angle of the upper and lower rolls can be changed. The frame 6 is supported by a balance cylinder 8 and a lowering device 9,9' and can be tilted by changing the up and down pressure of the lowering device. 3.3' is a roll that holds the wear from above and below and is supported by chocks 10 and 10'. The cylinder 11 is used to adjust the roll position according to the web thickness, and the cylinder 11' is used to adjust the wear path line according to the material size.

The amount of residual deformation after the longitudinal indentation stone and indentation correction (
Hereinafter, it will simply be referred to as the amount of deformation. ) differs depending on the size, but is influenced by web thickness, flange thickness, and flange width, and δ = "(δ., tw, tf, B, ×)... (1
) δ: Deformation amount δn: Push-in suspension 1w: Web thickness tf: Flange thickness 8: Flange width X: Distance from the tip.

The model for the intrusion depth δ0 and the deformation amount δ may be in the form of equation (1), but it is also possible to create separate models for each size. Model formula at the time of opening % Formula % (2) The straightening i'E machine is controlled by tracking the longitudinal position of the material at the pushing roll position and applying a pushing control yA@ according to the longitudinal position. FIG. 2 is a block diagram of the control system, which outputs an inclination angle command for the frame 6 when correcting an inclination, and outputs a relative angle command and a push command for the roll 2.2' when correcting a bend. 12 is a cheer machine, 1
3 is a sensor for measuring poor squareness of the material.

14 indicates a table roller for material conveyance.

Note that it is not necessary to always use the shape sensor 13. (If the deformation tendency is almost the same in the case of the same lot and the same size, the deformation amount of the initial straightening material can be used as is.

Example Hereinafter, the present invention will be explained in detail with reference to Examples.

This example is an example of tilt correction performed at t1500 x 200. Fig. 3 18j shows the longitudinal position dependence of deformation amount and indentation (formerly, the change in the longitudinal direction of the correction curve shape (mu δ) obtained by measuring with the sensor 13, fc+ is the longitudinal position dependence of the deformation amount and indentation
Push-in suspension δ necessary to correct i. fXl, ((the opening indicates the shape after correction, and re) indicates the case where correction was performed with a constant pushing amount for comparison. Note that δ' is the amount of deformation measured after correction.

Figure 3 fat, (b, fc'l, flll) and +e+
As is clear from the above, by carrying out the present invention, it is possible to correct the squareness uniformly in the longitudinal direction.

<Effects of the Invention> As explained above, the present invention provides a snow pressure device for correcting a defective flange squareness of an H-beam steel, by means of a snow pressure device for correcting a defective flange squareness of an H-section steel. It is characterized by uniformly correcting the perpendicularity in the longitudinal direction of the material, and by changing the pushing amount of the push roll in the longitudinal direction, it is now possible to uniformly correct the perpendicularity in the longitudinal direction of the material.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the squareness straightening rock according to the present invention, FIG. 2 is a control block diagram of the squareness straightening machine according to the present invention, and FIG.
Figures fat, lbl, (cl, (d) and te> are graphs showing the straightening effect by the straightening machine of the present invention, respectively.
Figure 4(a), fb), f C'1, fd'1 and I
e) is an explanatory diagram showing an example of poor flange perpendicularity, respectively;
FIG. 5 is an explanatory diagram of a conventional squareness straightening machine using flange pushing, and FIG. 6 is a graph showing longitudinal flange deformation a with constant pushing. Code 1...Material to be straightened 2.2'...Flange press roll 3.3'...
...Web restraint roll 4.4'...Chock 5.5'...Bin 6...Frame 7...Cylinder 8... ... Balance cylinder 9.9' ... Lowering device io, io' ... Chock 11.11'
...Cylinder 12 ... Straightening machine 13 ... Shape sensor 14 ... Table roller

Claims (1)

[Claims] A straightening device for correcting defective flange perpendicularity of H-beam steel, characterized by uniformly correcting perpendicularity in the longitudinal direction by changing the amount of pushing in the longitudinal direction of the material being straightened. Method for correcting flange squareness of section steel.