JP2688153B2 - Method of rolling H-shaped steel with groove - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling an H-section steel with a groove for producing a lining plate for a road surface by welding an H-section steel having protrusions or the like on the outer surface of a flange. It is about.

[0002]

2. Description of the Related Art Conventionally, a material such as a lining plate is provided with irregularities 15 on the outer surface of a flange 14 shown in FIG. H-section steel is used, and the upper tip of this H-section steel is butt welded (16 parts) as shown in (a) and (d).
Then, a lining plate member is made, and this member is laid on the road surface for use. This lining plate member is used as it is, and if desired, it is used by applying a coating agent 17 on the upper layer as shown in FIG. 6 (a) for the purpose of preventing noise and impact during traveling and further preventing slippage. There are things. Material (b)
The welding process when manufacturing the lining plate member (a) is to weld in the length direction, but if the tip of the flange of the material is sharply angled, the upper surface after welding as shown in Fig. 6 (d) A large rise d can be made. When the coating is not applied to the upper part, there is a drawback that noise and impact during traveling become large due to the welding protrusion d. When the coating 17 is used, the welding protrusion is increased. For this reason, the coating film thickness e of the welded portion 16 of (d) becomes thin, which may cause cracking or peeling of the coating. As a method of preventing this drawback, it is considered to provide welding grooves h and w at the tip of the flange as shown in (c).

As a rolling method for attaching this groove at a low cost, there is a "Steel Association / Materials and Process Vol. 5 199".
2 No. 5 "," Development of grooved H-section steel ", and the related art thereof will be described below.

FIG. 7 shows the arrangement of rolling mills for rolling grooved H-section steel, BD is a double rolling mill, which performs reverse rough rolling, and then universal rolling mill MU and edger rolling mill ME. Therefore, reverse intermediate universal rolling is performed, and further, tandem finish rolling is performed by continuous universal rolling mills (FU1, FU2, FU3) and edger rolling mills (FE) group to manufacture ordinary H-section steel. Among them, final finishing universal rolling mill F
In the edger rolling mill FE before U3, as shown in FIG. 8 (a), on the outer side surface 20 of the upper and lower edger rolls 18, 19,
Form a hole type with an inclination angle β according to the product groove shape,
The leading end of the flange 21 of the front pass universal rolled material is rolled down in the width direction to be rolled into a groove shape, and then the final finishing universal rolling machine FU3 performs forming rolling with universal rolls as shown in FIG. 8B. It is described that a predetermined grooved H-section steel is manufactured.

[0005]

However, this conventional technique has the following problems. FIG. 9 (a) corresponds to FIG. 8 (a).
3 shows the rolled state of the upper left flange portion 21 in detail. That is, when rolling with the edger rolling mill FE, in order to form the flange tip into a groove shape, a necessary reduction amount ΔE ₀ is secured in the flange width direction, but the roll outer surface 20 is large in accordance with the product groove shape. Formed with an inclination angle β, the outer surface of the flange is poorly restrained, so the amount of reduction ΔE
Width expansion [Delta] b ₀ corresponding to ₀ is generated, the flange distal outer is in a state having a locally bulge 22. This bulge is H-shaped due to differences in material cross-section, length direction, temperature differences between materials, rolling mill rigidity, play in thrust direction, and differences in metal flow characteristics at the top, middle, and bottom of materials. Depending on the steel part, the amount is not uniform, and this cannot be avoided. As a result, the following problems occur when forming and rolling with the following final finishing universal rolling mill FU3.

FIG. 9B shows the details of the rolling state of the flange portion 23 at the upper left portion in the final finish universal rolling. Originally, the horizontal roll 25 and the vertical roll 26 respectively provided the web 24 and the flange 23, respectively. Is finished with a small amount of reduction. However, in the front pass edger rolling mill FE rolling, since there is a local bulge at the tip of the flange, the tip of the flange receives a large local reduction on the vertical roll 26 side,
Even if the upper edge of the flange tip is shaped into a sharp groove with an edger roll (Fig. 9 (a)), as shown at 27 in Fig. 9 (b), the width spread on the vertical roll side that is easy to permeate under pressure is widened. It becomes large and can not maintain a sharp groove shape,
Also, the shape is not uniform depending on the part.

The present invention solves the above-mentioned drawbacks.
The present invention provides a rolling method for H-section steel with a groove having a good shape and less variation in shape in the final two-pass finish rolling of the H-section steel.

[0008]

The object of the present invention is to provide a method for rolling H-section steel formed by a pre-pass universal mill group, an edger roll group, and a finishing universal mill group. the the rolling member, almost equivalent to the flange thickness of the upper and lower roll caliber bottom width (T) is pre-pass the universal rolling material (tf), and the dimensions of the upper and lower roll caliber bottom (H), and (W) is So
The corresponding products of the groove of dimensions, respectively Re (h), and (w)
Slightly larger than, each further outward to 8 ° or less inclined to the corresponding surface on the outer surface of the H-beam of the upper and lower rolls (alpha)
In the hole shape of the edger roll provided with the above, after performing the reduction in the width direction, the rolling process of the grooved H-section steel is carried out by performing the form rolling with the following final finishing universal roll. However, H: a product provided outside the upper and lower roll hole bottoms
Vertical dimension of the surface corresponding to the groove portion , W: product groove portion provided on the outside of the upper and lower roll hole bottoms
The dimension of the surface corresponding to the above in the roll axial direction, h: the width of the groove of the groove provided on the outer side of the web
Orientation, w: Web thickness of the groove provided outside the web of the product
Dimension in direction.

[0009]

The operation of the present invention will be described in detail below. FIG. 1 shows an example of a rolling mill arrangement for carrying out the present invention. 1 in the figure
Is a rough rolling mill group composed of rolling mills of R ₀ , BD, R ₁ and R ₂ , 2 is 3 universal rolling mills of U ₁ , U ₂ and U ₃ and ₂ of E ₁ and E ₂ Intermediate rolling mill group composed of edger rolling mills, 3 is finish rolling composed of _four universal rolling mills U ₄ , U ₅ , U ₆ , and U ₇ and two edger rolling mills E ₃ and E _4. A group of rolling mills is shown. BD in the group of rough rolling mills normally performs reverse rolling, and the other rolling mills perform tandem rolling with one pass each.

FIG. 2 is an explanatory view of the order of H-shaped steel rolling with a groove according to the present invention, in which 1-a is a rolling mill R of the rough rolling mill group 1.
₂ shows the cross section of the finished material, 2-b is the intermediate shaping rolling (b ₁ , b ₂ ...) Corresponding to the intermediate rolling mill group 2, and then 3-c
Is finish shaping rolling (c ₁ ~
c ₆ ) is shown. 1-a to c ₄ are carried out in the same manner as the conventional rolling of H-section steel, and thereafter there is the edger roll hole type c _{5 of the} present invention. The edger roll hole type c ₅ has an inclination 6 on the outer surface of the upper and lower rolls so as to restrain the flange tip outer side part ₄ of the rolled material of the front pass universal roll c ₄ , and further outwardly of the bottom part of the upper and lower roll hole types. An edger roll hole die for forming a groove provided with a groove portion 5 is formed,
As a result, after rolling, the flange 10 of the front pass c ₅ is straightly formed by the conventional final finishing universal roll hole die c ₆ , and the vertical outer surface of the flange is made uneven by the vertical roll 11. As shown in FIG. 4, a product having a good groove shape 13 with little variation is obtained.

Details of the groove forming edger roll die are shown in FIG. 3c _5, and the dotted line 7 in the figure indicates the front pass universal roll rolled material. This is the grooved c ₅ width T of the upper and lower roll caliber bottom (horizontal distance between p to q) are substantially the same value as the flange thickness tf of the pass before the universal rolling member 7. Further, the dimensions H and W of the groove portion (q to r) are shown in FIG.
It is made slightly larger than the groove dimensions h and w of the product of the H-section steel with groove shown in FIG. Further, a relatively small inclination angle α is provided in the outward direction on the surface corresponding to the outer surface of the upper and lower rolls.

Here, the width T of the bottom of the groove from the starting point q of the groove 5 and the inclination 6 on the outer side surface of the groove forming edger roll groove and the flange thickness of the front pass universal roll rolled material 7 relationship tf is by making the (T-tf) ≒ 0, it is possible to restrain the flange distal outer portion of the rolled material, rolling reduction flange width direction shown in FIG. 3c ₅ 'delta
In order to suppress the width expansion that should occur due to E,
A local bulge like 21 shown in (a) does not occur.
Further, the inclination angle α of the inclination 6 of the outer side surface is preferably small for the reason of suppressing the local bulge similarly to the above. According to various field tests, these have a large swelling of the groove part (T-tf),
On the contrary, if it is small, the groove shape tends to be poor, and (T-
tf) is preferably in the range of 0.6 to -0.8 mm. Further, when α is too large, the groove portion tends to swell, and it was found that 8 ° is the upper limit. In addition, the arc-shaped relief 9 following the inclination 6 of the outer side surface is used as a guide for the flange tip outer side portion 4 of the front pass universal roll rolled material 7 to smoothly enter into the hole die, and the relief amount can be set as necessary. You can change it.

On the other hand, a groove forming edger roll hole type c
A shape dimension W and H of the groove portion in _5, the relationship between the groove geometry w and h of product shown in FIG. 4 the former for the following reasons and the test result is increased slightly. That is, in the rolling with the final finishing universal roll of FIG. 2c _6, the flange is widened in the width direction by rolling down the entire outer surface of the flange with the vertical roll 11 into the uneven shape 12, and a slight amount of rolling is applied by the rolling mill for tandem rolling. Tension (tensile)
Due to rolling, it is assumed that the shape dimensions W and H of the groove portion 5 become small. Therefore, various field tests were conducted in order to quantitatively understand the above relationship. As a result, as shown in FIG. 5, it was found that the groove shape dimensions w and h of the product are proportionally smaller than the groove shape dimensions W and H of the edger roll hole die c ₅ , respectively, and
It became easy to set the groove shape dimensions W and H of the edger roll hole type c ₅ .

Next, the result of an example in which the present invention is tested with the grooved H-section steel having the unevenness on the flange outer surface shown in FIGS. 2 to 4 with the rolling mill arrangement shown in FIG. 1 will be described. The product size is 190 (G) × 197 with the shape shown in FIG.
(B) × 5 (t ₁ ) / 7 (t ₂ ), which has a groove shape dimension of w = 3.0 mm and h = 2.5 mm. Jar roll hole type c
Table 1 shows the relationship between the dimensions of No. ₅ and the rolled material of the front pass universal roll and the relationship with the product.

[0015]

[Table 1]

As a result, in the edger roll hole die for groove forming, there is no local bulge on the outer side of the flange tip, and the groove shape of the product is a predetermined sharp groove portion. As shown in Table 2, it was possible to produce a good product with little variation and almost the target value.

[0017]

[Table 2]

[0018]

According to the present invention, a new rolling mill or a new rolling mill can be used in the same rolling process as that of the conventional H-section steel having unevenness on the outer surface of the flange, which is simply formed into a groove shape by the edger roll before the final finishing universal roll. It became possible to manufacture products with excellent groove shape and groove dimensional accuracy at low cost without adding rolls.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of arrangement of rolling mills for carrying out the present invention.

FIG. 2 is an explanatory view of the order of rolling the grooved H-section steel having irregularities on the outer surface of the flange according to the present invention.

FIG. 3 is a detailed explanatory view of FIG. 2, where c ₅ is a groove forming edger roll hole type, and c ₅ ′ is a rolling state explanatory view.

FIG. 4 is a product drawing of a H-shaped steel with a groove.

FIG. 5 is a relationship diagram of the groove shape of the edger roll for groove forming and the groove shape dimension of the product.

FIG. 6 is an explanatory view of processing a member for a road surface lining plate.

FIG. 7 is a plan view showing the arrangement of a rolling mill for rolling a conventional H-section steel with a groove according to the literature.

FIG. 8 is an explanatory view of the conventional H-section steel rolling with a groove, (a) is an edger roll hole type for forming a groove, (b) is
Is the final finish universal roll hole type.

FIG. 9 is an explanatory view of problems in H-shaped steel rolling with a groove according to FIG.

[Explanation of symbols]

1 ... Coarse rolling mill group 2 ... Intermediate rolling mill group 3 ... Finishing rolling mill group 4 ... Flange tip outer side portion 5 ... Edger roll groove portion 6,20 ... Edger roll outer inclination 7 ... Front pass universal roll rolling material 8 ... Vertical line outside edger roll hole type 9 ... Edger roll hole outside part relief 10 ... Edger roll rolled material flange part 11, 26 ... Vertical roll 12, 15 ... Flange outer surface irregularity 13 ... Product opening Front part 14 ... Flange part of product 16 ... Butt weld part 17 ... Coating material 18, 19 ... Upper and lower edger rolls 21 ... Front pass universal rolled material flange portion 22 ... Edger roll Local bulge of rolled material 23, 24 ... Final finishing universal roll Flange of rolled material, web 25, 26 ... Final finishing universal horizontal roll, vertical roll 27 ... Final finishing univers Groove shape of Saruroru rolled material

Claims (1)

(57) [Claims] 1. A pre-pass the universal mill group, edger rolls, and, in the rolling method of H-shaped steel for molding by finishing universal mill group, after the pass before universal mill rolling, the rolled material, the upper and lower roll caliber bottom width (T) is approximately the same as the flange thickness (tf) of the rolled material in the front pass, and the upper and lower roll holes
The dimensions (H) and (W) of the mold bottom correspond to each other.
Products of the groove dimension (h) that, and (w) slightly larger than, provided each further outward to 8 ° or less inclined to the corresponding surface on the outer surface of the H-beam of the upper and lower rolls (alpha) A rolling method for H-section steel with a groove, characterized in that it is a hole type of an edger roll, and after being rolled in the width direction, it is formed and rolled by the following final finishing universal roll. However, H: a product provided outside the upper and lower roll hole bottoms
Vertical dimension of the surface corresponding to the groove portion , W: product groove portion provided on the outside of the upper and lower roll hole bottoms
The dimension of the surface corresponding to the above in the roll axial direction, h: the width of the groove of the groove provided on the outer side of the web
Orientation, w: Web thickness of the groove provided outside the web of the product
Dimension in direction.