JPH07155802A - Universal rolling/forming method of shape steel having web and flange - Google Patents

Abstract

PURPOSE:To reduce the cost of roll and operation cost by separately manufacturing an intermediate material for wide flange, I-beam, or the like without changing the rolls of a 2-high roughing mill and intensively reducing the kinds of rolls of 2-high roughing mill. CONSTITUTION:Based on the inlet-side web thickness tW, inlet-side flange thickness tF, web draft rW, flange draft rF, diameter DH of horizontal roll and diameter DV of vertical roll of a universal rolling mill at all passes in a rolling process with an intermediate roughing universal mill and finishing universal mill, a quantity (s) shown by the equation I is determined. At this pass, rolling is executed after moving the axial center of the vertical roll pair of the universal mill toward the outlet side in the rolling direction of the material to be rolled by the (s) when the (s) is positive and after moving the axial center toward the inlet side in the rolling direction of the material to be rolled by (-s) when the (s) is a negative value to the reference plane which passes through the center axis between the upper and lower horizontal rolls. The equation I is (s)=(DVrFtF)<1/2>-(1/2DHrWtW)<1/2>... I.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention passes a dog-bone type cross-section rough steel slab (hereinafter simply referred to as "rough steel slab") through which a H-shaped steel, I The present invention relates to a method for roll-forming a shaped steel having a web and a flange such as shaped steel.

[0002]

2. Description of the Related Art Conventionally, for example, a rolling process for manufacturing an H-shaped steel 55 shown in FIG.
The heavy hole rolling mill 1, the intermediate material 54 to the final product 55
First intermediate coarse universal rolling mill 2 in charge of rolling up to
a and an edging rolling mill 2b provided near the first intermediate rough universal rolling mill 2a, an edging rolling provided near the second intermediate rough universal rolling mill 3a and the second intermediate universal rolling mill 3a. It comprises a rolling mill 3b and a finishing universal rolling mill 4.
Here, as a rolling material for H-section steel, in recent years, instead of a beam blank formed by soaking and slabbing from a steel ingot, a rectangular cross-section steel slab by continuous casting is often used in order to omit steps and improve quality. It became so. The rough forming technology of the intermediate material using the rectangular cross-section steel billet is disclosed in Japanese Patent Publication No. 58-193.
The techniques disclosed in Japanese Patent Publication No. 61, Japanese Patent Publication No. 58-37042, etc. are well known. FIG. 6 shows an example of a roll hole type arrangement of the rough double hole rolling mill 1, in which the upper and lower roll pairs 11, 12 include a grooved hole type G1, a widening hole type G2, a groove elimination hole type G3, and a forming hole type G4. Four hole types are engraved. FIG. 7 shows a process in which the intermediate material 54 is formed using the rectangular cross-section steel piece 5 as a raw material by the pair of upper and lower rolls 11 and 12 of the coarse double-hole rolling mill 1 having such a hole shape. In FIG. 7, the rectangular cross-section steel piece 5 has a width W0 and a thickness H0, and the grooved hole die G1 is a hole die for forming the V-shaped groove 51a in the short side portion of the rectangular cross-section steel piece 5, The top angle is θ at the center of the hole bottom width.
A central bulge 21a having an apex angle θ1 is formed in the central portion of 1 and groove portions 21a are formed on both sides of the central bulge 21a. The hole bottom width S1 of the grooved hole mold G1 is set to be substantially equal to the thickness H0 of the rectangular cross-section steel piece 5 in order to accurately form the V-shaped groove 51a at the center of the short side of the rectangular cross-section steel piece 5. However, in actuality, in order to prevent the occurrence of flaws due to contact with the side wall, it is usually set to be slightly larger than H0. The purpose of the grooved hole mold G1 is to form the V-shaped groove 51a, and the width (hereinafter, referred to as "web height") of the final finished material of the grooved hole mold G1 is W1 having a substantially rectangular cross section. Width W
Is equal to zero. The V-shaped groove 51a provided in the short side portion of the rectangular cross-section steel piece 5 by the grooved hole die G1 accurately guides the material to be rolled to the central portion of the widened hole die G2, and tilts or twists during edging rolling. Is prevented. Widening hole type G2 hole bottom width S
2 and the apex angle θ2 of the central bulging portion 22a are set to be larger than the hole bottom width S1 of the grooved hole mold G1 and the apex angle θ1 of the central bulging portion 21a. In the widened hole mold G2, the side surface 42 corresponding to the H-shaped steel flange is divided and expanded by the central bulging portion 22a by the widthwise edging rolling until the web height becomes W2, and the flange portion is generated and the flange width and the amount of wall thickness are increased. The flange width is enlarged to finish the flange width to a value B2 that is substantially equal to or close to the hole bottom width S2.

[0003] Next, the widthwise edging rolling is performed in the groove erasing hole die G3 in which the hole bottom width S3 is set to be larger than the hole bottom width S2 of the widening hole die G2. The flange width and thickness of the material are further expanded to make the flange width a value approximately equal to the hole bottom width S3 or a value in the vicinity thereof B
3 dog bone material 541 is finished. At the same time, the central bulge portion 23a having a top angle θ3 formed larger than the apex angle θ2 of the central bulge portion 22a of the widened hole die G2 moderates the inclination of the V-shaped groove 52a formed by the widened hole die G2. 53a to prevent the occurrence of breakage flaws on the outside of the flange in the subsequent steps. In the above edging rolling from the grooving hole die G1 to the groove erasing hole die G3, the effect of the width reduction does not reach the central portion in the width direction of the rolled material as shown in FIG. Material Grooving Hole Type G1
The web thickness H1 in, the web thickness H2 in the widening hole mold G2, and the web thickness H3 in the groove eliminating hole mold G3 hardly change and are substantially equal to the original thickness H0 of the rectangular cross-section steel piece. Subsequently, the dog bone material 5 is formed by the forming hole die G4.
In order to form the web portion and the flange portion of 41, the web portion is pressed down and the flange portion is shaped to form an intermediate member 54 having a web height W × a flange width B × a web thickness t _WM.
The rolling is finished by the forming hole mold G4 at the time point where is obtained. At this point, the ratio t _FM / t _WM between the flange thickness t _FM and the web thickness t _{WM at} the center of the flange piece width of the intermediate member 54 is the final product 5
5 is approximately equal to the flange / web plate thickness ratio t _FP / t _WP . Next, using this intermediate material as a raw material, in each of the universal rolling mills of the first intermediate rough universal rolling mill 2a, the second intermediate rough universal rolling mill 3a, and the finishing universal rolling mill 4, the flange rolling reduction r _F and the web rolling reduction r
_The reduction is repeated under the condition that the ratio r _F / r _{W of W is} approximately 1 to mold the final product 55.

A problem in this case is that in the universal rolling, web center deviation due to web replacement is easily induced. Therefore, conventionally, the molding hole type G
In step 4, rolling was performed to a shape as close to the final product as possible to reduce the amount of rolling in the universal rolling mill, which tends to cause web center deviation. That is, the forming hole mold G4 is an indispensable hole mold, and for example, the dog bone material 541 finished with the groove eliminating hole mold G3 does not go through the forming hole mold G4 engraved in the size and shape corresponding to the H-section steel product series. The direct universal rolling on the sheet was not realized because there were many problems in securing the accuracy of the web center position. If a process that can eliminate the forming hole mold G4 is realized by overcoming this problem, the number of sets of coarse double hole roll pairs 11 and 12 held in each H-section steel product series will be greatly reduced. It is possible to reduce the roll cost by sharing a pair of coarse double-hole type rolls of the same flange width series.

The reason why web replacement is likely to be induced in universal rolling will be described below. FIG. 8: is explanatory drawing of rolling of H-section steel by a universal rolling mill. FIG. 8A is a plan view showing a state of universal rolling. F is a sectional shape of the material to be rolled before rolling, and F ₀ is a sectional shape of the material to be rolled after rolling. The flange of the rolled material F traveling in the direction of arrow 6 is rolled between the flange reduction start point 13 and the flange reduction end point 14 by the cross section of the horizontal roll pairs 61 and 62 and the vertical roll pairs 71 and 72. The flange thickness changes from t _F to t _F0 . The horizontal distance l _F between the flange reduction start point 13 and the flange reduction end point 14
Is commonly referred to as the flange projected contact arc length. Figure 8 (b)
8A is an explanatory view of a vertical cross section taken along the line EE in FIG. 8A, in which the web of the material F to be rolled is between the web reduction start point 15 and the web reduction end point 14 due to the horizontal roll pairs 61 and 62. Rolled at a web thickness of t _W to t _W0 . This horizontal distance l _W between the web reduction start point 15 and the web reduction end point 14 is commonly referred to as the web projection contact arc length.

FIG. 8 (c) is an explanatory view of an example in which the induction of the material F to be rolled is inconvenient. This state is due to wear of the roller table that loads and conveys the material to be rolled, warpage of the material to be rolled,
It is caused by many factors such as the deformation of the tip of the lower flange due to the weight of the material to be rolled. In this case, the height F of the web center line C-1 of the rolled material F is different from that of the roll gap center line C-2 of the horizontal roll pair 61, 62. In the example of FIGS. 8A and 8B, the rolling of the material to be rolled F starts at 13 at the beginning of the flange rolling, and then the web rolling starts at 15 with a delay of Δl (= l _F −l _W ). To do. As shown in FIG. 8A, when the web is rolled, the flange is also rolled by the side surface of the horizontal roll 61 (62) and the vertical roll 71 (72). ) You cannot move freely in the direction of arrow 7. Therefore, in the rolled material F of FIG. 8 (c), in which guidance is inconvenient, the web is in a state where the rolled material F cannot move in the direction of arrow 7,
It is fed into the roll gap between the pair of horizontal rolls 61, 62 and rolled. Therefore, after rolling, as shown in the post-rolling cross-sectional shape F ₀ of FIG. 8C, a web center deviation ΔC occurs in the rolled material. A web guide guide can be considered as one of means for preventing this, but this is effective when the rolling of the material to be rolled is at the final stage.
That is, in the final stage of rolling, for example, the guide guide 8 having the web guide rollers 91, 92, 93 as shown in FIG.
1, 82 to correct the warpage of the material F to be rolled, and the web center line C-1 and the upper and lower horizontal roll pairs 61, 62.
It is possible to guide the roll gap centerlines C-2 by making them coincident with each other, and it is possible to suppress the occurrence of web center deviation. However, since the section modulus of the material to be rolled is large at the initial stage of universal rolling such as rough shaping rolling in the first intermediate rough universal rolling, it is not possible to expect the straightening of the warp by the guide and the effect of preventing the web center deviation. .

On the contrary, when the reduction of the web precedes the reduction of the flange, the deviation of the web center is likely to occur. Contrary to FIGS. 8A and 8B, FIGS. 10A and 10B show the case where the rolling start point 15 of the web precedes the rolling start point 13 of the flange when l _F <l _W. In this case, Δl
(= L _F -l _W ), and in the region of Δl, the reduction of the flange has not started yet, and the single reduction of the web occurs, and most of the reduction of the web is performed in the region close to this inlet side. Therefore, the web is largely pressed from both sides while being restrained from extending in the lengthwise direction by the flanges, and the width is expanded. When the web plate thickness is large, the web is compressed in the width direction along with the flange reduction after the flange reduction start point 13, and the web width becomes substantially equal to the horizontal roll cylinder width U. However, when the web thickness is thin, the web buckles when the web is compressed in the width direction with the flange reduction after the flange reduction start point 13, and the exit side cross sectional shape becomes the cross section F ₀ in FIG. 10. As shown
Deflection Δh occurs on the web. Due to this deflection, the web center line C-1 is moved to the horizontal roll pair 61,
Since the roll gap centerline C-2 of 62 is raised by Δh and is caught, the web position is changed for the same reason as before. Since this phenomenon is caused by the amount of web width expansion in the single web rolling region, it tends to occur as the cross-sectional area of the web becomes smaller than that of the flange.

[0008]

The problem to be solved by the present invention is to overcome the drawback of the universal rolling mill, that is, to easily induce the deviation of the center of the web, and to solve the problem of forming holes in the rough double hole rolling mill. By providing the rough universal rolling mill with the function of the mold G4 and omitting this forming hole mold G4, that is, the groove mold to be engraved on the rough double hole roll is grooved hole mold G.
By using only the widening hole type G2 and the groove erasing hole type G3, the rough double hole type roll is shared between a plurality of series to reduce the roll cost and the work cost associated with the roll.

[0009]

The features of the present invention are as follows:
In the universal rolling from the roughing stage, the web and the flange are simultaneously started to be rolled, so that the web center line C-1 and the roll gap center line C of the horizontal roll pair 61 and 62.
-2 are matched to form an intermediate material having a web center position accuracy equivalent to that of the intermediate material 54 formed by the conventional forming hole mold G4. That is, the gist of the present invention is "a method for manufacturing a shaped steel having a web and a flange by using an intermediate rough universal rolling mill and a finishing universal rolling mill using a rough shaped billet as a raw material, the intermediate rough universal rolling mill and the finishing universal rolling mill. Entry-side web thickness t _W , entry-side flange thickness t _F , web reduction ratio r for all or some of the passes of the rolling process by the rolling mill.
_{Based on W} , the flange reduction ratio r _F, the horizontal roll diameter _DH of the universal rolling mill, and the vertical roll diameter D _V , for the amount s calculated by the following equation (1), the universal movement is performed in the pass. The axis of the vertical roll pair of the rolling mill is
When s is a positive value with respect to the reference plane passing through the central axes of the upper and lower horizontal rolls, s is moved to the rolling direction outgoing side of the rolled material by s,
Is a negative value, it is in the universal rolling forming method for a shaped steel having a web and a flange, in which the material is moved by -s to the rolling direction entry side of the material to be rolled. Expression (1) is a condition for starting simultaneous reduction of the web and the flange.

[0010] _{s = (D V r F t} F) 1/2 - (1 / 2D H r W t W) 1/2 ···· (1) below, further illustrate the present invention in detail.

FIG. 1 shows a manufacturing means of the present invention, which will be described in comparison with the conventional method shown in FIG. In FIG. 1, the same members as those in FIG. 7 described above are designated by the same reference numerals, and detailed description thereof will be omitted. In the case of the conventional method, a rectangular cross-section steel piece 5 having a width W0 and a thickness H0 is provided with a groove G
1, the side wall 31 guides the end of the long side of the rectangular cross section, and the V-shaped groove 51a is formed while the material width is almost unchanged (W1≈W0). Then, by the edging rolling in the width direction by the widening hole die G2 and the groove erasing hole die G3, the rough shaped steel piece 541 having the web thickness H3 (≈H0) and the flange width B3 is formed.
The intermediate member 5 having a web height W × a flange width B × a web thickness t _WM while finishing the web portion with the forming hole mold G4.
Format 4.

On the other hand, in FIG. 1 of the present invention, as in the conventional case, the V-shaped groove 51a is formed by the grooving hole die G1, the width direction edging rolling is performed by the widening hole die G2, and the groove erasing hole die G3. H3, a rough steel slab having a flange width B3 is finished, and this rough steel slab 541 is further successively processed by the upper and lower horizontal roll pairs 61 and 62 and the left and right vertical roll pairs 71 and 72 of the first intermediate coarse universal rolling mill 2a. 2 Intermediate coarse universal rolling mill 3a and finishing universal rolling mill 4
Thus, in order to make the rolling direction positions of the flange rolling start point 13 and the web rolling start point 15 coincident in each pass, s = l _F -l _W from the reference plane xx 'passing through the upper and lower horizontal roll centers and perpendicular to the paper surface. Only by moving the axial center of the pair of left and right vertical rolls 71, 72 to the rolling side of the material to be rolled in the rolling direction (when s> 0) or inward side (when s <0) by rolling | s | Obtain the product 55.

Here, the flange projected contact arc length l _F and the web projected contact arc length l _W are the horizontal roll diameter D _H , vertical roll diameter D _V , pre-rolling flange thickness t _F , and post-rolling flange thickness t _FO . Pre-rolling web thickness t _W , post-rolling web thickness t _W0 ,
The formula expressed as a function of the flange reduction ratio r _F = (t _F −t _F0 ) / t _F and the web reduction ratio r _W = (t _W −t _W0 ) / t _W is derived below.

As shown in FIG. 8, assuming the angular position θ _F along the circumferential surface of the vertical roll 72 (71) from the flange rolling start point 13 to the flange rolling end point 14, the geometrical shape shown in FIG. From the above relationship, 1 _F = 1 / 2D _V sin θ _F (2) cos θ _F = {1 / 2D _V − (t _F −t _F0 )} (½D _V ) = 1-2 (t _F −t _F0 ) / D _V (3) holds. When θ _F is eliminated from the equations (2) and (3), 1 _F = 1 / 2D _V (1-cos ² θ _F ) ^1/2 = 1 / 2D _V [1- {1-2 (t _F − t _F0 ) / D _V } ² ] ^1/2 = 1 / 2D _V [4 (t _F −t _F0 ) / D _V − {2 (t _F −t _{F 0} ) / D _V } ² ] ^1/2 [] Since the second term in the above is small with respect to the first term, if this is ignored, l _F = {D _V (t _F −t _F0 )} ^1/2 = (D _V r _F t _F ) ^1/2 (4) Next, as shown in FIG. 8B, when the angular position along the circumferential surface of the horizontal roll 61 (62) from the web reduction start point 15 to the web reduction end point 14 is θ _W , FIG. From the geometrical relationship shown in (1), l _W = 1 / 2D _H sin θ _W (5) cos θ _W = {1/2 _DH −1/2 (t _W −t _W0 )} / (1/2 _DH ) = 1− (t _W −t _W0 ) / D _H (6) holds, and if θ _W is deleted from the equations (5) and (6), then l _{W = 1 / 2D H (1} -cos 2 θ W) 1/2 = 1 / 2D H [1- {1- (t W -t W0) / D H} 2] 1/2 = 1 / 2D H [ _{2 (t W -t W0) /} D H - for small relative _{{(t W -t W0) /} D H} 2] 1/2 [] second term in the first term, ignore it Then, l _W = {1 / 2D _H (t _W −t _W0 )} ^1/2 = (1 / 2D _H r _W t _W ) ^1/2 (7) is obtained, and the formula (4) and the formula (7) are obtained. ), The formula (1) is derived.

Therefore, in each pass of the rolling method based on the equation (1), the rolling start point 15 and the rolling end point 14 of the web are set.
The position of is the same as before, but the starting point of the reduction of the flange 1
3 and the rolling reduction end point 14 move in parallel by the axial movement amount s of the pair of left and right vertical rolls 71, 72, and the rolling reduction start point of the flange moves to 15 and the rolling reduction end point moves to 16. That is, the web and the flange always have the same rolling start point of 15.
This makes it possible to prevent web replacement due to mismatch of pass lines (that is, shift between C-1 and C-2). Further, since there is no single web reduction prior to the flange reduction, the web does not bend, and therefore the reattachment of the web due to the deflection of the web can be prevented.

[0016]

EXAMPLES An example of carrying out the rolling shaping of the intermediate material based on the above-mentioned means of the present invention will be described below. H400 x 3
Coarse double rolling roll pair 1
1, 12 through the grooved hole type G1, the widening hole type G2, the groove elimination hole type G3, through the rough shaped steel piece, the flange thickness is almost made by the first intermediate rough universal rolling machine using the rough shaped steel piece as a raw material. The following shows two pass schedules when an intermediate material of 93 mm and a flange / web plate thickness ratio (t _FM / t _WM ) of 2.8 was formed. First, Table 1 (a) shows the rolling method according to the present invention, and Table 1 (b) shows the pass schedule of the conventional "normal universal rolling method (flange preceding rolling)". Here, the roll gaps S _H and S _V are the specifications shown in FIGS. 2 and 3.

In the rolling shaping, the rectangular cross-section steel piece as a raw material has a cross-sectional dimension of 1100 mm in width and 250 mm in thickness,
The roll hole type arrangement and main dimensions of the used rough double hole rolling mill 1 are shown in FIG.
The size and shape of the roll a is shown in FIG.

Both of Tables 1 (a) and 1 (b) are pass schedules for roll-molding an intermediate material of the same cross section having a web thickness of 33 mm and a flange thickness of about 92 mm. Also,
The rolling schedules for the rough double rolling hole type and the first intermediate rough universal are the same in both Table 1 (a) and Table (b), but Table (a) shows the rolling start point and the flange of the web over all passes. Rolling is performed by moving the axial centers of the vertical roll pairs 71 and 72 by s so that the rolling start points of are aligned. However, when s is a positive value, it means that the axial center of the vertical roll pair 71, 72 is moved to the outlet side, and when it is a negative value, it is moved to the inlet side.
On the other hand, Table 1 (b) shows a rolling method in which the axes of the vertical roll pairs 71 and 72 are not moved (s = 0).

The cross-sectional shape of the finally obtained intermediate material is shown in FIG.
Shown in (a) and (b). FIGS. 4A and 4B are cross-sectional shapes of the intermediate material according to the pass schedules in FIGS. 1A and 1B, respectively. In the cross-sectional shape of the intermediate material to which the method of the present invention shown in Table 1 (a) was applied, the deviation of the web center was slight, and a good cross-sectional shape could be obtained. On the other hand, in the case of the pass schedule shown in Table 1 (b), when the web becomes thinner, the web easily bends, and the web is replaced due to the bend. In the present embodiment, the flange tip portion was rounded because the flange tip portion was not formed by the edging rolling mill with the intention of clarifying the difference in basic shaping characteristics in universal rolling. It is conventional that the final product 55 can be obtained from the intermediate material shaped by edging rolling, then through the second intermediate rough universal rolling mill 3a corresponding to each series, the edging rolling mill 3b, and the finishing universal rolling mill 4. Is the same as. That is, this means that by replacing the conventional forming and rolling by the forming hole G4 with the vertical intermediate-rolling rolling method that satisfies the formula (1) in the first intermediate universal rolling mill 2a, the rough double-hole rolling roll is used. It is possible to omit the forming hole G4 of (1), and the web height of the pair of rough double hole rolling rolls 11 and 12 can be shared between the series.

In the above-mentioned embodiment, the crude steel slab formed from the rectangular cross-section slab by the coarse double-hole type rolling roll is used as the raw material, but the continuously cast coarse slab (so-called beam blank slab) is used. It goes without saying that the present invention can be applied to the case where () is used as the material. Further, although the application example of the present technology is shown for all the passes of the first intermediate universal rolling, for the latter-stage passes close to the finish universal rolling in which the web center guide preventive equipment such as the web guiding guide is sufficiently effective. It is also possible to apply the technique of the present invention only to the first pass of the intermediate universal rolling without applying the technique of the present invention, and it goes without saying that the present invention also falls within the scope of the present invention.

[0021]

[Table 1]

[0022]

As described above, according to the present invention, it becomes possible to omit the forming die G4 in the conventional coarse double-hole rolling mill in forming an intermediate material for H-section steel made of a rectangular cross-section steel billet. , It is possible to model multiple series of intermediate materials with different web heights without changing the rolls of the rough double hole rolling mill, and the roll cost and the roll of the rough double hole rolling mill are attached. It has become possible to reduce the working cost.

[Brief description of drawings]

FIG. 1 is an explanatory view of a rolling situation of the present invention

FIG. 2 is a roll layout diagram of a rough double-hole rolling mill having a grooved hole die G1, a widened hole die G2, and a groove eraser die G3 according to an embodiment of the present invention.

FIG. 3 is an explanatory view of dimensions and shapes of a first intermediate coarse universal rolling roll according to an embodiment of the present invention,

4A and 4B are schematic cross-sectional views of an intermediate material according to the method of the present invention and the comparative method in the embodiment of the present invention.

FIG. 5 is an explanatory view showing a rolling facility for a section steel such as an H section steel and an I section steel having a web portion and a flange portion.

FIG. 6 is an explanatory diagram showing an example of a roll hole type arrangement of a rough double hole type rolling mill.

FIG. 7 is an explanatory view showing a method for manufacturing a rough-shaped steel slab from a rectangular-section steel slab in a conventional rough double-hole rolling mill.

8 (a), (b) and (c) are explanatory views of H-section steel rolling by a universal rolling mill.

FIG. 9 is an explanatory view of a situation of a web center deviation prevention rolling method using a web guide guide.

10 (a) and 10 (b) are explanatory views of H-section steel rolling (web preceding rolling) by a universal rolling mill.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rough double hole rolling mill 2a ... 1st intermediate rough universal rolling mill 2b ... 1st edging rolling mill 3a ... 2nd intermediate rough universal rolling mill 3b ... 2nd edging rolling mill 4 ... Finishing universal rolling mill 5 ... Rectangle Section steel strip 6 ... Rolling direction of rolled material 7 ... Direction perpendicular to rolling direction of rolled material 11,12 ... Upper and lower roll pairs of coarse double-hole rolling mill 13 ... Flange of rolled material in conventional universal rolling method Rolling start point 14 ... Rolling end point of rolled material web and flange in conventional universal rolling method 15 ... Rolling down starting point of rolled material web in conventional universal rolling method, or rolling point when vertical axis pair 71, 72 moves axially Rolling material flange rolling start point 16 ... Flange rolling end point when the axial center of vertical roll pair 71, 72 moves 21a, 22a, 23a ... Grooving hole type G1, widening Type G
2, central bulge portion 21b of each groove eliminator G3 ... Groove portions on both sides of the central bulge portion of the hole die G1 ... Side wall portions of the hole die G1 ... Side faces of the rolled material in the hole die G2 that correspond to the flanges 51a, 52a, 53a ... Hole type G1, hole type G2, hole type G
3 V-shaped groove of the material to be rolled in each of 541 ... Dogbone material shaped by the hole type G3 54 ... Conventional forming hole type G4 Finished or formed by the first intermediate rough universal rolling machine according to the method of the present invention Intermediate material 55 ... H-shaped steel final product 61, 62 ... Vertical roll pair 71, 72 of universal rolling mill 71, 72 ... Vertical roll pair 81 of universal rolling mill 81, 82 ... Web guide guide 91, 92, 93 ... Supported by guide guide Is a roller for web guidance

Claims (1)

[Claims] 1. A method for manufacturing a shaped steel sheet having a web and a flange by using an intermediate rough universal rolling mill and a finishing universal rolling mill using a rough shaped steel slab as a raw material, and rolling by the intermediate rough universal rolling mill and the finishing universal rolling mill. Entry-side web thickness t _W , entry-side flange thickness t for all or some passes of the process
An amount s calculated by the following formula (1) based on _F , web reduction ratio r _W , flange reduction ratio r _F , horizontal roll diameter _DH and vertical roll diameter D _V of the universal rolling mill.
On the other hand, in the pass, the axial center of the vertical roll pair of the universal rolling mill is rolled by s when s is a positive value with respect to the reference plane passing through the central axes of the upper and lower horizontal rolls. Characterized by moving to the direction exit side, and when s is a negative value, moving to the rolling direction entrance side of the material to be rolled by -s, and rolling.
Universal rolling molding of shaped steel having a web and flanges _{s = (D V r F t} F) 1/2 - (1 / 2D H r W t W) 1/2 ···· (1)