JPH1147803A - Production of wide flange shape with small angular projection and beveling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the spread of flanges in its transverse direction and to improve dimensional accuracy by subjecting a rough rolling stock to simultaneous shaping of the welding bevels at the front ends of flanges and the projecting lines on the outside surface of the flanges by means of the perpendicular rolls of universal rolling, trimming the bevel shapes by means of the horizontal rolls of an edger of the ensuing stage and forming the projection lines to projections by means of the perpendicular rolls of finish universal rolling of the final stage. SOLUTION: The rough rolling stock is rolled by means of the perpendicular rolls 21a, 21b of the finish universal rolling mill having box type calipers 22a, 22b consisting of side walls 23 of the perpendicular rolls opening and inclining to an outer peripheral side and bases 24 inscribed with plural grooves 26 parallel with the circumferential direction, by which the bevelings of the front ends of the flanges and the projection lines 13 on the outside surface of the flanges are simultaneously formed. Next, the rolling stock is rolled down in the transverse direction of the flanges by the edger, by which the bevel shapes are trimmed and the variations in the transverse spread of the flanges are corrected. The rolling stock is thereafter subjected to finish rolling by the perpendicular rolls 21a, 21b inscribed with plural grooves 26 parallel with the axial direction on the outer peripheral surfaces, by which the projection lines 13 formed up to the previous stage are rolled down and parted to form the plural small square projections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for producing a shaped steel, and more particularly to a method for producing an H-shaped steel having small angular projections on an outer surface of a flange used for a road surface covering plate and the like and having a groove at a tip end of the flange.

[0002]

2. Description of the Related Art H-section steels having irregularities on the outer surface of a flange have been produced for road lining boards because of the need to increase the friction coefficient of the surface in order to prevent slippage of automobiles and pedestrians. An H-shaped steel material is juxtaposed with a horizontal flange portion, and the flange front ends are sequentially butt-welded to form a lining plate member having a desired width. This member is laid on a road surface for use. Grooves necessary for butt welding are usually formed by machining, but there are also rolled ones provided with a welding groove at the distal end of the flange.

FIG. 1 shows an example of an H-section steel 1 in which a groove is formed at the tip of a flange of the H-section steel. In this example, the flange 10
The outer surface has irregularities, and a w × h groove 7 is provided at the tip. The most efficient method for forming such a groove is hot rolling. For example, Japanese Patent Application Laid-Open No. Hei 6-134501 discloses that the outer surfaces of the upper and lower rolls are provided with an inclination so as to restrain the outer surfaces of the flanges, and the protrusions slightly larger than the groove width of the product are provided outside the bottoms of the upper and lower roll holes. A method of rolling a grooved H-section steel is proposed, in which the width is reduced by an edger roll for forming a groove having a groove shape with a rounded corner, and then the final finishing universal rolling mill forms irregularities on the outer surface of the flange. Have been.

[0004]

SUMMARY OF THE INVENTION
In the method described in 6-134501, it is necessary to fill the material to the bottom of the narrow groove in one pass,
When forming a groove with a large w and h, if the draft in the width direction is small, the material does not fill up to the bottom of the groove, and the groove dimension varies. On the other hand, if the draft is increased, the bulges to the flange outer surface where there is no constraint. There was a problem that would occur.

[0005] Further, after a groove is formed at the tip end of the flange by an edger rolling mill, irregularities are formed on the outer surface of the flange by a finishing universal rolling mill. There is a problem that the spread in the width direction is promoted, and the shape of the groove formed by the edger roll is changed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and is suitable for use as a road surface lining board or the like. The purpose of the present invention is to propose a manufacturing method.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventor reduced the flange in the thickness direction with a vertical roll of a finishing universal rolling mill,
The groove and the ridge on the outer surface of the flange are formed at the same time, and the horizontal roll of the edger rolling machine arranged behind the finishing universal rolling mill is pressed down in the flange width direction to adjust the groove shape. By using a vertical roll to divide the protrusion on the outer surface of the flange to form a protrusion, it was found that the spread in the flange width direction was almost eliminated, the variation in groove dimensions was small, and the dimensional accuracy was improved. The present invention has been made based on such findings.

That is, according to the present invention, the finish rolling of the H-shaped steel with square projections and grooves is performed by finish-rolling a roughly rolled H-section steel which has been subjected to breakdown rolling and rough rolling. A first step of rolling down a flange of a rough-rolled steel material in the thickness direction to form a groove at the tip of the flange and forming a plurality of ridges parallel to the length direction on the outer surface of the flange; A second step of adjusting the shape of the groove formed at the front end of the flange by pressing down in the direction, and a plurality of small protrusions by pressing down a plurality of protrusions on the outer surface of the flange formed in the first step. A method of manufacturing a small projection and an H-beam with a groove, characterized by comprising a third step, wherein the first step comprises: a side wall having a slope open to the outer peripheral side;
It is preferable to use a finishing universal rolling mill having a vertical roll engraved with a box-shaped die formed of a bottom having a plurality of grooves parallel to the circumferential direction, and the second step includes: A groove having a bottom portion, a substantially vertical inner side wall forming one wall of the convex portion, and an outer side wall having a slope open to the outer peripheral side. It is preferable to use a finishing edger rolling mill having horizontal rolls, and the third step is preferably a finishing universal rolling mill having a vertical roll having a plurality of grooves parallel to an axial direction formed on a surface thereof.

[0009]

FIG. 2 shows an example of a rolling mill train suitable for carrying out the present invention. 31 is a coarse double rolling mill (so-called breakdown rolling mill), 32 is a coarse universal rolling mill, 33 is a coarse edger rolling mill, 34 is a finishing universal rolling mill, 35 is a finishing edger rolling mill, and 36 is a finishing universal rolling mill. is there.

In the present invention, first, the H-section steel is subjected to breakdown rolling by a breakdown rolling mill 31 and rough universal rolling (rough rolling) reciprocating between a rough universal rolling mill 32 and a rough edger rolling mill 33 as shown in FIG. H-section steel rough-rolled material (hereinafter simply referred to as “rough-rolled material”)
). Until the material is roughly rolled, it is the same as the ordinary H-section steel rolling.

Next, the rough-rolled material is subjected to finish rolling to obtain small H-shaped steel with small projections and grooves. In the present invention, the finish rolling includes a first step, a second step, and a third step. The first step of finish rolling is performed by a finish universal rolling mill 34 shown in FIG. FIG. 4A shows an example of a cross-sectional shape of a vertical roll suitable for use in the finishing universal rolling mill used in the first step. The horizontal rolls 20a and 20b of the finishing universal rolling mill 34 used in the present invention are used.
Is similar to a normal H-section horizontal roll. This first
4A, as shown in FIG. 4 (a), box-shaped cavities 22a and 22b formed of a side wall 23 having a slope open to the outer peripheral side and a bottom surface 24 having a plurality of grooves 26 parallel to the circumferential direction are formed. Finishing universal rolling mill with engraved vertical rolls 21a, 21b
Preferably, 34 is used.

The vertical rolls 21a and 21b of the finishing universal rolling mill 34 lower the flange of the rough rolled material in the thickness direction. At this time, the width of the flange is restricted by the side wall 23, and a groove is formed at the front end of the flange. The inclination of the side wall 23 is preferably set to be smaller than the inclination of the groove of the product. Further, the bottom surface 24 of the vertical rolls 21a and 21b
Due to the plurality of parallel grooves 26 (depth d ₂ ) provided at the same time, a plurality of parallel ridges 13 are formed on the outer surface of the flange 10 as shown in FIG.

In the present invention, since the formation of the groove at the tip of the flange and the processing of the outer surface of the flange are performed simultaneously, there is no variation in the dimensional accuracy due to a change in the groove size that occurs during the processing of the outer surface of the flange. Box-caliber 22a, base width b ₁ of 22b is hot target dimension of the flange width of the product B minus the width w × 2 open destination flange tip (see FIG. 1) (B-2w) Therefore, it is determined in consideration of the amount of reduction in the flange width direction in the second step described later. Width b ₂ of the box-grooved inclination _{2d 1 / (b 2 -b 1} ) grooved side wall 23 is set to be smaller than the inclination h / w of the groove as a target. Box-caliber 22a, the depth d ₁ of 22b goals flange thickness tf and horizontal rolls 20a, 20b and the vertical rolls 21a, is determined in consideration of the gap S between 21b.
The groove 26 depth d ₂ which is formed on the bottom surface 24 is determined in consideration of the target projection height.

In this case, the flange thickness tf of the rough rolled material
_o is the flange thickness after finishing universal rolling tf ₁ (=
d ₁ + S) and corresponds to a plus cuts amount of projection height by pressure protrusion height d ₂ forming, flange width B ₀ is rising wide flange by flange thickness reduction (= tf ₀ -tf ₁₎ as is adjusted in the rough universal rolling becomes after rolling B ₁ by.

Next, in the first step of finish rolling, FIG.
In the second step of finish rolling, the material formed into the shape as shown in (b) is further reduced in the width direction of the flange by the finishing edger rolling machine 35 (reduction amount = Δe), and is formed at the front end of the flange. The groove shape is adjusted, and the variation in the width of the flange in the first step is also corrected. The horizontal rolls 25a and 25b of the finishing edger mill 35 used in the second step are provided with a convex portion 9 and groove portions 2 on both sides of the convex portion 9.
A groove having a bottom 2a, a substantially vertical inner side wall 2b forming one wall of the projection 9, and an outer side wall 2c having a slope open to the surface (outer side). Is preferably a roll engraved.

FIG. 5 shows an example of the cross-sectional shape of the upper and lower horizontal rolls of the finishing edger mill suitable for the second step of the present invention. Groove 2 is a groove for rolling the flange tip, base width c _1, inlet width c _2, consisting of dimensions of depth g. The position of the groove bottom is the position corresponding to the target flange width B (FIG. 5).
And (b) refer), base width c ₁ of the groove is determined from the flange thickness and the groove of the size of the target, the inlet width c ₂ of the groove is greater than the flange thickness tf ₁ of the rolling is the material, preferably 1.5
It should be more than double. The outer side wall 2c of the groove 2 has a slope (c ₂ −c ₁ ) / g which is open to the outer peripheral side, and adjusts the groove shape of the flange. The depth g of the groove may be set so that the slope (c ₂ −c ₁ ) / g is substantially equal to the slope h / w of the target groove dimension. Therefore, 2d ₁ /
(C ₂ −c ₁ ) / g is larger than (b ₂ −b ₁ ), and the material can easily enter the groove bottom even under light pressure.

In the second step, the material whose width has been reduced in the width direction of the flange is then subjected as a third step to a finishing universal rolling mill having a vertical roll having a plurality of grooves parallel to the axial direction formed on the outer peripheral surface. Finish rolling is applied. In the third step, the plurality of projections on the outer surface of the flange formed in the first step are reduced to form a plurality of small square projections. The plurality of protrusions formed in the longitudinal direction of the outer surface of the flange are pressed down, and the protrusions are divided into a plurality of small protrusions. The reduction at this time hardly causes expansion in the flange width direction, and has no effect on the groove size.

FIG. 6 shows an example of the cross-sectional shape of the roll used in the finishing universal rolling mill using the third step. 27a
, 27b are horizontal rolls, 28a and 28b are vertical rolls, and the outer peripheral surface of the vertical roll has a plurality of grooves parallel to the axial direction.
29 are formed (FIG. 6C). In the present invention, the horizontal rolls of the finishing universal rolling mill in the first step, the horizontal rolls of the finishing edger rolling mill in the second step, and the horizontal rolls of the finishing universal rolling mill in the third step are variable in width even in the case of an integrated roll. Needless to say, any of the split-type rolls may be used.

In the present invention, the flange is firstly lowered in the thickness direction by a vertical roll of a finishing universal rolling mill to simultaneously form a groove at the tip of the flange and a ridge on the outer surface of the flange. It is important that the upper and lower horizontal rolls of the edger rolling mill lightly press down in the flange width direction to adjust the groove shape. This allows
The change in the groove dimension that occurs when machining the outer surface of the flange is eliminated, and the dimensional accuracy of the groove is significantly improved. In addition, the third
In the step (3), the protrusions on the outer surface of the flange are pressed down to divide the protrusions, so that there is no change in the groove dimension, and there is no variation in groove dimension accuracy.

Further, according to the present invention, the position in the width direction of the flange and the position of the web rolled by the horizontal roll are fixed by the constraint of the vertical roll of the finishing roll in the first step by the hole-shaped side wall, so that the web is fixed. And the displacement of the flange (from the center of the web) is reduced, and the displacement (pattern displacement) of the projection formed on the outer surface of the flange is also reduced.

[0021]

【Example】

Example 1 H-section steel was subjected to breakdown rolling and rough universal-edger rolling to obtain a flange width B ₀ = 194 mm.
And a rough rolled material having a flange thickness tf _o = 9.5 mm. Next, as a first step, the rough-rolled material was subjected to universal rolling by a finishing universal rolling mill having a vertical roll with a groove. Caliber dimensions of the vertical rolls of the finish universal rolling mill, a box-caliber base width b ₁ = 192 mm, width of the box-type grooved b ₂ = 204 mm, a box-shaped grooved depth d ₁ = 6 mm, and further A trapezoidal groove having a depth d ₂ = 2 mm and a width of 5 mm on the bottom surface was formed on the bottom surface of the hole mold.

By the first step, the rolled material has a flange width B ₁ : 201 mm, a flange thickness tf ₁ : 7 mm, and a thickness at the tip of the flange: 2.5 mm, and a plurality of ridges (height 2 mm, flange 2 19 width) were formed. Next, as a second step, the shape of the front end portion of the flange and the groove was adjusted by using an edger rolling mill for the first step material. In the edger rolling, an upper and lower horizontal roll in which a groove having a bottom width c ₁ = 3 mm, an inlet width c ₂ = 11 mm, and a depth g = 6 mm was formed below the flange tip pressure lower part. By this finishing edger rolling, the flange width B was adjusted to 199 mm.

Thereafter, as a third step, the outer peripheral surface of the flange formed in the first step by a universal rolling mill having a vertical roll having a plurality of parallel grooves (2 mm in depth) formed in the outer peripheral surface in the axial direction. The ridges were pressed down, and the ridges were divided to form small projections on the outer surface of the flange. After cooling, the small projections having the target dimensions of flange width B: 197 mm, flange thickness tf: 7 mm, groove dimensions h: 4 mm, w: 3 mm, and small projections with a height of 1.8 to 2.0 mm. And an H-beam with a groove.

According to the above-described method, as a result of rolling 100 H-section steels (12 m length) with small projections and grooves, the dimensional accuracy of the groove was 4 mm on average, 4 mm in average, with a target value of 4 mm. ~
4.2mm, w is the target value 3mm, average value 3mm, range 2.8
A good product with a small variation of about 3.3 mm, almost as intended, was obtained.

[0025]

Industrial Applicability According to the present invention, the dimensional accuracy of the groove is improved, and even if a small projection is formed on the outer surface of the flange, the dimensional variation of the groove is small and the quality of the product is remarkably improved. It has a remarkable effect. Further, according to the present invention, the position in the width direction of the flange and the position of the web to be rolled by the horizontal roll are fixed by the restraint by the grooved side wall formed in the vertical roll of the universal rolling mill.
Misalignment of web and flange of section steel (from center of web)
And the displacement (pattern displacement) of the position of the projection formed on the outer surface of the flange is also reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the shape of a projection and a grooved H-section steel.

FIG. 2 is an explanatory view schematically showing one example of a rolling mill arrangement suitable for carrying out the present invention.

FIG. 3 is a cross-sectional view schematically showing the shape of a rough rolled material.

FIG. 4 is a cross-sectional view schematically showing the shape of a rolling roll in a finishing universal rolling mill suitable for use in the first step, and a partial explanatory view of the appearance of a rolled material rolled by these rolls (b). It is.

FIG. 5 is a cross-sectional view schematically showing a shape (a) of a rolling roll and a state of reduction in a finishing edger rolling machine suitable for use in the first step.

FIG. 6 is a sectional view (a) showing the shape of a rolling roll in a finishing universal rolling mill suitable for use in the third step;
It is explanatory drawing (c) which shows the shape of (b) and a vertical roll typically.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 H-shaped steel 2 Groove part 2a Bottom part 2b Inner side wall 2c Outer side wall 7 Groove 9 Convex part 10 Flange 11 Web 13 Ridge 14 Projection 20a, 20b Horizontal roll (horizontal roll) 21a, 21b of finishing universal rolling mill Finishing universal rolling mill Vertical rolls (vertical rolls) 22a, 22b Vertical roll type (box type) 23 Vertical roll side walls (side walls) 24 Vertical roll type bottoms (bottom surface) 25a, 25b Finished edger mill horizontal roll ( Edger roll) 26 grooves 27a, 27b Horizontal rolls 28, 28a, 28b Vertical rolls 29 grooves 31 Coarse double rolling mill (breakdown rolling mill) 32 Coarse universal mill 33 Coarse edger mill 34 Finishing universal mill (No. 1) ) 35 Finishing Edger Rolling Mill 36 Finishing Universal Rolling Mill (2nd)

Claims (4)

[Claims] 1. A breakdown-rolled and roughly-rolled H
When the rough-rolled material is finish-rolled into a small protrusion and an H-beam with a groove, the finish-rolling rolls down the flange of the rough-rolled material in the thickness direction to the flange tip. A first step of forming a groove and forming a plurality of ridges parallel to the length direction on the outer surface of the flange, and squeezing the flange in the width direction to adjust the shape of the groove formed at the front end of the flange; A second step, and a third step of pressing down a plurality of protrusions on the outer surface of the flange formed in the first step to form a plurality of small protrusions, wherein the small protrusions and the groove are provided. A method for manufacturing an H-shaped steel. 2. The finish in which the first step has a vertical roll engraved with a box-shaped groove formed by a side wall having a slope open to the outer peripheral side and a bottom having a plurality of grooves parallel to the circumferential direction. The method for producing an H-section steel according to claim 1, wherein the method is performed by a universal rolling mill. 3. The method according to claim 1, wherein the second step includes a protrusion, a groove on both sides of the protrusion, the groove having a bottom, a substantially vertical inner side wall forming one wall of the protrusion, The method for producing an H-section steel according to claim 1 or 2, wherein the method comprises a finishing edger rolling mill having a horizontal roll engraved with a groove formed by an outer side wall having a slope open to the outer peripheral side. 4. The H-shape according to claim 1, wherein the third step is performed by a finishing universal rolling mill having a vertical roll having a plurality of grooves parallel to an axial direction formed on a surface thereof. Steel production method.