JP2663806B2 - Edger mill for rolling H-section steel and rolling method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of H-section steels used in the fields of, for example, construction and civil engineering by hot rolling, and more particularly to an intermediate section of H-section steel using a rough universal mill and an edger mill. The present invention relates to an edger mill in a rolling stage and a method for rolling a coarse material using the same.

[0002]

2. Description of the Related Art Conventionally, as a method of rolling an H-section steel,
2. Description of the Related Art A method is known in which a coarse shaped billet is rolled by a group of universal coarse mills including a coarse universal mill and an edger mill, and then finish rolled by a finish universal mill.

[0003] As shown in FIG. 1, the rolling of the conventional H-section steel by a group of universal coarse mills involves the use of a coarse universal mill 20 comprising a horizontal roll 10 and a vertical roll 12 as shown in FIG. Rolling along with 2 in Fig. 1 (b).
Rolling is performed by an edger mill 22 including a step (double) edger roll 14. Coarse universal mill
Rolling by 20 reduces the thickness of the web and flange of the H-beam, and the edger mill 22 has the function of reducing the flange width of the H-beam.

[0004] By the way, under the flange width pressure in the edger mill 22, the roll thickness of the edger mill 22 is reduced by the inner surface and the front surface of the flange (Fig. b) The shape is such that it comes into contact only with A-side and B-side respectively.

[0005] In order to improve the dimensional accuracy of the product H-beam, for example, even if the shape of the edger roll 14 is made into a shape like a beam blank forming hole shown in FIG.
The shape of the hole must be a shape suitable for the flange thickness at the end of one pass of rough universal rolling. Therefore, after the third pass, the outer surface of the flange must remain free without contacting the roll.

FIGS. 3A to 3C are schematic sectional views showing examples of the sectional shape of such a conventional edger roll 14. FIG. Figure 3 (a) shows the rolls of the edger mill 14,14.
Fig. 3 (b) shows an edger roll 14 having a small-diameter roll drum having a tapered end on both sides of a large-diameter roll drum. FIG. 3 (c) shows an example in which a sleeve-shaped split roll in which a roll with a body is divided into two sides, which is reciprocally fitted to a roll arbor 16 as an edger roll 14, is used. Shown respectively.

However, even if edging rolling is performed by such a conventional edger mill, the effect of controlling the flange width is extremely small. This is because, as shown in FIG. 4, even when the flange width of the H-section steel 1 is reduced by the conventional edger roll 14, only the flange end indicated by the arrow in the figure faces outward because the outer surface of the flange is unconstrained. And the central part of the flange is not deformed. In other words, only the end of the flange is set up. When the material to be rolled in such a form is rolled by a rough (or finished) universal mill in the next process, the width of the upset portion is increased and the flange width is increased. Becomes extremely small. This situation is schematically shown in FIG. When the edging path shape shown by the solid line is rolled by the next rough (finish) universal mill, a kind of width return occurs, and the shape shown by the broken line in the drawing is exhibited. Such up and down
If the flange width is asymmetrical on the left and right, the center of the web will be deviated, resulting in a decrease in product yield.

In the state shown in FIG. 4, when the flange thickness is small, the flange portion 2 of the H-shaped steel 1 undergoes buckling deformation as shown in FIG. As a result, in addition to causing a large center deviation in the product, the variation in the flange width in the direction of the rolled material is increased, and the yield of the product is reduced.

In view of the above-mentioned drawbacks of the prior art, the present applicant, when rolling down the flange width of the H-section steel, prevents upset of the flange tip and buckling of the flange, and furthermore, the web Japanese Patent Application Laid-Open No. 4-172106 (Japanese Patent Application No. 2-298050) has proposed a method for rolling an H-section steel capable of efficiently reducing the flange width without causing center deviation.

FIG. 7 shows an outline thereof. In an edge mill 90 for rolling an H-section steel, an edger roll 96 includes an arbor 92 having a convex portion having a sectional shape for restraining a desired inner surface of a flange of a material to be rolled. A sleeve 94 is provided so as to be freely adjustable in the direction of the rotation axis of the arbor, and is capable of restraining the outer surface of the flange of the material to be rolled and simultaneously pressing down the flange tip, and these are provided in two stages. The edger mill 90 is configured. In FIG. 7, only one edger roll 96 is shown. An edger mill 90 having two stages of edger rolls 96 as described later.
By constraining almost the entire surface of the H-section steel to be rolled by the hole formed by the arbor 92 and the sleeve 94, even when the flange is lowered, the flange tip does not locally deform, and Buckling of the flange portion can also be prevented, and it is possible to extend the H-shaped steel uniformly in the longitudinal direction over the entire cross section.

[0011]

However, as a result of repeated experiments on an actual rolling line, the present applicant has found that there is a problem in rolling an H-section steel with an edger mill having an edger roll shown in FIG. As a result, the following matters became clear.

FIG. 8 is a cross-sectional view for explaining the edging rolling state of the H-section steel by the edger roll 96 shown in FIG. 7. The surface 102 for restraining the inner surface of the flange of the arbor 92 is perpendicular to the rotation axis of the arbor 92. Angle between the surface and θ ₁ , sleeve 94
The plane perpendicular angles between the rotation axis of the surface 104 is arbor to restrain the flange outer surface and theta ₂ of the rotation shaft and the angle of the surface 106 is arbor 92 to pressure the flange tip of the sleeve 94 theta
_3. Further, when a gap S between the surface 106 and the convex portion of the arbor 92 is set, it is characterized that these values satisfy the following conditions.

0 ° <θ ₁ ≦ 5 °, 0 ° ≦ θ ₂ ≦ 10 °, 0 ° ≦ θ ₃ ≦ 5
° S = Flange thickness of the material to be rolled × 0-10% Therefore, S changes according to the angle of θ ₃ and the opening in the width direction of the sleeve, and the larger the θ _{3 and the} larger the opening of the sleeve, That is, S increases as the flange thickness of the H-section steel to be rolled increases.

However, while the rolling is actually repeated, the opening degree of the gap S between the facing surface of the sleeve 94 and the arbor 92 shown in FIG. At 10 mm, the scale generated from the material to be rolled 1 penetrated into the gap of S, and eventually the scale was deposited in the gap, making it impossible to change the opening of the sleeve.

Further, as a measure for preventing the above-mentioned scale intrusion, sealing the gap with an O-ring or the like was examined. However, it was found that the work was extremely difficult because the gap of S during rolling was not constant and changed.

Therefore, by setting θ ₃ = 0 °, the sleeve 94
And although the gap S of the opposing surfaces of the arbor 92 is consider to be a constant value less than a few millimeters, this time θ _1> 0 °
If this is done, the perpendicularity of the material to be rolled to the side surface of the front end of the flange is lost, resulting in a defective product shape.

On the other hand, when θ ₃ = θ ₁ = 0 °, the angle of the flange of the rolled material (the vertical rolled surface) is set so that the rolled material of the edger mill (the universal rolled material adjacent to the edger mill) is easily bitten by the edger mill. Angle) must be 0 °. For this reason, the angle between the side surface of the horizontal roll of the universal mill adjacent to the edger mill and the vertical plane must also be 0 °. However, in a coarse universal mill that performs multiple pass rolling while reversing a hot H-section steel, the flange of the material to be rolled is perpendicular to the vertical line in order to reduce wear on the side surfaces of the horizontal rolls of the coarse universal mill. Is generally rolled at an angle of about 5 °. Therefore, when the angle of the horizontal roll of the coarse universal mill is set to 0 ° as described above, wear on the side surface of the horizontal roll is accelerated, and roll surface roughness is caused.

In view of the above, the present invention is intended to improve the flange width control by preventing the flange tip from being upset or causing the flange to buckle when the flange width of the H-section steel is reduced. An edger mill for rolling H-shaped steel consisting of edger rolls with excellent durability and capable of suppressing the web center deviation and preventing the scale from entering the sliding surface of the variable width roll, and an H-shape using the edger mill The purpose is to provide a method for rolling steel.

[0019]

In order to achieve the above object, the present inventor has made various studies and found that the surface 106 of the sleeve 94 facing the arbor 92 is in contact with the contact surface with the arbor 92 and the tip of the flange. To separate the function into
It has been found that at least the last one pass or several passes at the time of edging rolling reduces the above-mentioned problem by rolling down by the pressing surface, thereby completing the present invention.

That is, the present invention relates to an edger mill used for reducing the width of a flange of a H-section steel by hot rolling, wherein the arbor has a convex portion having a cross-sectional shape for restraining an inner surface of a flange of a material to be rolled. An edger mill comprising two stages of an edger roll provided with a sleeve capable of adjusting the position in the direction of the rotation axis of the arbor and having a sleeve capable of restraining the outer surface of the flange of the material to be rolled and simultaneously pressing down the end of the flange. A parallel surface in which the opposing surfaces of the arbor and the sleeve are maintained parallel to the rotation axis of the arbor, and an inclined surface that presses down the tip of the flange, the inclined surface being opposed to the rotation axis of the arbor. An edger mill for rolling H-beams, characterized in that the angle formed is equal to the angle formed by the flange surface of the material to be rolled with respect to the vertical direction. That.

From another aspect, the present invention relates to a method for rolling an H-section steel in which a coarse shaped billet is rolled by a group of universal coarse mills consisting of a coarse universal mill and an edger mill, and then finish rolled by a finish universal mill. Then, by using the edger mill having the above configuration as the edger mill, and moving the sleeve in the arbor rotation axis direction for each pass or every several passes of the universal coarse mill group, the inner surface of the flange of the material to be rolled is When the arbor is constrained by the convex portion, the sleeve further restrains the outer surface of the flange of the material to be rolled, and at the same time performs edging rolling in which the flange tip is lowered, at least the last one pass or several passes are performed on the flange tip of the material to be rolled. An edger for H-section steel, wherein the entire area is reduced by the inclined surface of the sleeve. A rolling method of the mill.

[0022]

Next, the present invention will be described in more detail with reference to the accompanying drawings. As shown in FIG. 9, the edger mill used in the present invention is basically the same as in
An arbor 92 having a convex portion at the center thereof, similar to that disclosed in Japanese Patent No. 2106, and a pair of the arbor 92, which is movable in the rotation axis direction of the arbor 92 and is adjustable in position, is provided on the left and right sides of the convex portion. And an edger roll 96 comprising a cylindrical sleeve 94 provided in two stages.

FIG. 10 shows an edger mill according to the present invention.
An outline of the edging and rolling of H-section steel using the 100 configurations is shown. According to the present invention, the surface 106 of the sleeve 94 facing the arbor 92 is divided into a horizontal surface 106 'and an inclined surface 106''. The horizontal surface 106 'is parallel to the axis of rotation of the arbor 94, while the inclined surface 106''is configured to use at least a portion of it to reduce the flange tip.

In the drawing, the inner surface of the flange 2 of the material 1 to be rolled is restrained by a convex portion of the arbor 92, and the outer surface of the flange 2 is restrained by a sleeve 94 movable in the direction of the rotation axis of the arbor 92. Inclined surface 10 of sleeve 94
Reduce by 6 ''.

By doing so, the front end of the flange is constrained by the hole formed by the arbor and the sleeve, so that no thickening occurs at the front end of the flange, but increases at the lower portion of the flange. Furthermore, in the next step of universal rolling, even if the flange portion is pressed down in the thickness direction, the thickened portion is formed at the center of the flange, so that the thickened portion does not flow in the flange width direction, and the rolling direction is increased. Most will flow in the (extending direction). Therefore, the influence of the increase in the thickness of the flange portion is extremely small.

Therefore, the outer sleeve 94 is provided for each pass.
Is moved in the direction of the rotation axis of the arbor 92 and the groove width of the portion corresponding to the flange of the grooved shape always matches the flange thickness of the material 1 to be rolled, thereby preventing the flange width from increasing in universal rolling. The effect of reducing the width of the flange is much greater than the current situation.

The means for moving or fixing the sleeve 94 in the direction of the rotation axis, that is, the position adjusting means is a known technique using a screw and a hydraulic pressure (for example, Japanese Patent Application Laid-Open No. 60-72603 or Japanese Patent Application Laid-Open No. 61-193706). ) Can be easily realized.

As is apparent from FIGS. 9 and 10, in the present invention, in order to restrain the inner surface of the flange of the material 1 to be rolled, an arbor 92 having a convex portion having a sectional shape corresponding to the inner surface of the flange is provided. Used. This projection is arbor 92
It may be one with the main body or separable, and is not particularly limited.

However, the convex portion is H which is a material to be rolled during rolling.
In order to restrain the inner surface of the section steel, it is necessary to have a cross-sectional shape that matches the desired inner shape of the flange of the material to be rolled.
That is, when the surface to restrain the flange inner face of the arbor 92 and theta ₁ the angle formed between a plane perpendicular (vertical plane) to the rotation axis of the arbor 92, the generally rough universal rolling and edger rolling subsequent H-shaped steel is Since the flange of the material to be rolled has a maximum inclination of about 5 ° with respect to the vertical plane, it is preferable that 0 ° <θ ₁ ≦ 5 °.

Two sleeves 94, which are movable or fixed in the direction of the rotation axis of the arbor 92 and are capable of restraining the outer surface of the flange of the material 1 to be rolled, are inserted in two on the left and right sides of the projection. ing. The sleeve 94 is a cylindrical member having an inner hole to be inserted into a general portion (a portion other than the convex portion) of the arbor 92. The outer diameter may be larger than the convex portion of the arbor, and there is no particular limitation. However, in the present invention, the roll shown in FIG. 9 is used as an edger roll 96 of a two-stage edger mill. Needless to say, it is necessary to prevent the upper and lower sleeves from interfering with each other.

First, in the present invention, the roll hole type of the edger mill 90 formed by the arbor 92 and the sleeve 94 is, as shown in FIG. In addition, the two sleeves are formed by fitting each other with a screw or hydraulic pressure or a composite means thereof. For example, in the case of screwing, the portion corresponding to the screw is shifted right and left from the position of the hole type.

[0032] Of the outer surface of the sleeve 94, a plane at right angles to the plane (vertical plane) and theta ₂ of the angle to the axis of rotation of the arbor 92 to restrain the outer surface of the flange 2, as shown in FIG. 10 to, for the angle theta ₂ is set in a range of 0 ° ≦ θ ₂ ≦ 10 ° is desirable. Because, when θ ₂ <0, it becomes difficult to bite the flange 2 of the material to be rolled into the grooved portion of the edger roll 90, and when θ ₂ > 10 °, the effect of restraining the flange outer surface is weakened. Because.

As shown in FIG. 10, the position where the flange tip is lowered, that is, the facing surface 106 of the sleeve 94 is partly parallel to the rotation axis of the arbor 92 and partly forms an angle of θ ₃ . The angle θ ₃ is an angle θ formed by a surface 102 that restricts the inner surface of the flange of the arbor 92 and a surface perpendicular to the rotation axis of the arbor 92.
Be equal to ₁ it is important to maintain the perpendicularity of the flange tip. Therefore, the _{θ 3 0 ° <θ 1 (} = θ
₃ ) It is better to be ≦ 5 °.

Further, a portion set at the angle θ ₃ ,
That is, assuming that the sleeve length of the inclined surface 106 '' is L, L may be the maximum flange thickness in the product series of the material to be rolled + the marginal algebra mm. This is because, if the combined L largest product flange thickness, when finishing the small flange thickness product than, at least one pass the tip of the flange portion imparted with angle theta ₃ is then edging intermediate This is because rolling can be completed.

FIGS. 11 (a) and 11 (b) are schematic enlarged views of the rolling state around the flange tip for each of the initial pass and the final pass by the edger mill of the present invention.
As shown in FIG. 11 (a), in the initial pass of the edger rolling, since the flange thickness of the material 1 to be rolled is relatively large, the reduction of the flange tip by the sleeve 94 causes the surface parallel to the rotation axis of the arbor 92 to move. It carried out at both the surface having an angle of theta _3. That is, the process is performed on both the parallel surface 106 'and the inclined surface 106''.

On the other hand, in the final pass of the edger rolling, as shown in FIG. 11B, the flange thickness of the material 1 to be rolled becomes smaller than the sleeve length L having an angle of θ ₃ , reduction of parts are performed only in a plane having an angle of theta _3, the flange tip is finished at a right angle. In the case where the flange tip cannot be finished at a right angle in one final pass in this way, the flange tip may be reduced by the inclined surface in as many passes as necessary before the final pass.

Further, as shown in FIG. 10, if the gap between the surface of the outer surface of the sleeve 94 that presses down the tip of the flange and the convex portion of the arbor is S, S is the edging roll by the edger roll of the present invention. The design should be constant and 0.5 mm to several mm. Although not shown, an “O” ring may be inserted into the gap S between the sleeve 94 and the arbor 92 to prevent the scale or the like from entering the gap S between the sleeve 94 and the arbor 92. Unlike the conventional case, since the gap S is fixed, it is easy to provide such an "O" ring. Also, as another aspect, air through this gap,
Water, oil mist, or a mixture of these fluids may be released to prevent scale intrusion.

As described above, in the edger mill, almost the entire surface of the H-section steel to be rolled is constrained by the hole formed by the arbor and the sleeve, so that even when the flange is lowered, the local part of the tip of the flange can be reduced. No deformation occurs, buckling of the flange portion can be prevented, and the H-shaped steel can be uniformly stretched in the longitudinal direction over the entire cross section.

FIG. 12 shows still another embodiment of the present invention. According to the embodiment, the convex portion of the arbor 92 of the basic structure shown in FIG. -It has a split sleeve structure that can be fixed. According to such an embodiment, the outer sleeves 94, 94 are the same as those in FIG. 9, but the inner sleeves 94 'obtained by dividing the above-mentioned projection into two parts are provided inside thereof.
94 'is provided. By adjusting the distance between these inner sleeves 94 ', 94', H
Even in the production of shaped steel, edging rolling can be performed with the same edger roll, and the number of edger rolls held can be reduced. Here, it goes without saying that the movement and fixation of the inner sleeves 94 ′ and 94 ′ in the direction of the rotation axis can be easily realized by screws or hydraulic pressure or a composite means thereof as in the case of the outer sleeve 94. Next, the present invention will be described more specifically with reference to examples, but the present invention is not unduly limited thereby.

[0040]

[Example] As a material to be rolled, H600 × 200 (web height: 600
mm, flange width: 200 mm) The edger mill and the rolling method of the present invention were applied to the manufacturing process of one series (four sizes) of JIS size H-section steel.

First, a beam blank was rolled from a continuous casting slab by a dozen passes using a breakdown mill. At this time, the dimensions of the beam blank are 50 mm to 60 m for the web thickness.
m, and the flange thickness was 90 mm.

The beam blank was roughly rolled to a shape close to a predetermined product size in a rough mill group including a rough universal mill and an edger mill of the present invention. The number of rolling passes at this time was 9 to 11 passes.

The hole shape of the edger roll at this time is shown in FIG. 10 as θ ₁ = 5 °, θ ₂ = 10 °, θ ₃ = 5 °.
And Since the maximum flange thickness in the H600 × 200 series product is 23 mm, the length L of the inclined surface is set to 25 mm, and the gap S between the opposing surfaces of the arbor 92 and the sleeve 94 is 0.5 mm.
mm. Further, an "O" ring is incorporated in a horizontal plane 106 'forming a sliding surface between the sleeve 94 and the arbor 92, so that the scale is prevented as much as possible from entering the variable roll width mechanism.

Table 1 summarizes the measurement results of the flange width and the total length of the web center deviation of the product obtained by performing the edging rolling by the apparatus and method according to the present invention and then shaping and rolling by a universal finishing mill. The table also shows, for comparison, results obtained when edging rolling was performed using a conventional edger mill 22 as shown in FIG. 1 (b).

[0045]

[Table 1]

As can be seen from Table 1, when rolling is performed using a conventional edger mill as shown in FIG. 1 (b), the flange width fluctuation and the web center deviation are large, while in the case of the present invention, Since a vertically symmetrical shape can always be maintained through each pass of the universal rough mill group, the center deviation of the product and the fluctuation of the flange width are extremely small.

The amount of movement of the sleeve due to the reduction of the flange thickness in each rolling pass is about 20 mm at the maximum, and the time required for changing the width of the sleeve is about 10 seconds. Had little effect.

Further, no flaws were found on the product at the tip of the flange in the gap between the rolls, and the edger mill according to the present invention was longer than the conventional edger roll shown in FIGS. It works normally for about 20 times longer,
There was no trouble in the scale or the like entering the roll width variable mechanism. Table 2 summarizes the durability of the roll of the present invention as compared with the case where the rolls of FIGS. 7 and 8 are used.

[0049]

[Table 2]

[0050]

According to the present invention, as described above,
By moving the thickness of the part corresponding to the flange thickness of the edger roll hole type for each pass or every several passes, edging can be performed in a state where the flange thickness always coincides with the flange thickness of the material to be rolled. Therefore, it is possible to roll an H-section steel having a small flange width variation and a small web center deviation while diverting the conventional edging stand as it is. Furthermore, compared to the conventional edger mill having the same variable-division roll, a mill having much better durability can be provided, which is industrially extremely effective.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are schematic explanatory views showing a rolling state of an H-section steel in a coarse universal mill and an edger mill used in a conventional universal mill group, respectively.

FIG. 2 is a schematic sectional view showing an outline of a conventional hole type edger mill.

3 (a) to 3 (c) are schematic cross-sectional views showing cross-sectional shapes of various conventional edger rolls.

FIG. 4 is a schematic explanatory diagram showing an outline of an upset effect by edging.

FIG. 5 is an explanatory diagram of returning the width of the upset portion.

FIG. 6 is a schematic explanatory view showing a state of buckling of a flange due to edging.

FIG. 7 is a schematic sectional view showing a conventional hole-type variable edger roll in an assembled state of an arbor and a sleeve.

FIG. 8 is a partial schematic cross-sectional view showing a hole shape of a conventional hole type variable edger mill.

FIG. 9 is a schematic sectional view showing an edger roll according to the present invention in a state where an arbor and a sleeve are assembled.

FIG. 10 is a partially schematic sectional view showing a hole shape of the edger mill according to the present invention.

FIGS. 11 (a) and 11 (b) are partial schematic cross-sectional views showing the edging rolling state of an H-section steel by an edger roll according to the present invention.

FIG. 12 is a schematic sectional view showing a modified example of the edger roll according to the present invention in a state where an arbor and a sleeve are assembled.

[Explanation of symbols]

92: Arbor 94: Sleeve 100:
Edging mill 106: Opposite surface 106 ': Horizontal surface 106'':
Slope 1: Rolled material 2: Flange

Claims (2)

(57) [Claims] 1. An edger mill 100 used for reducing the width of an H-section steel in a flange width direction by hot rolling, comprising an arbor 92 having a convex portion having a cross-sectional shape for restraining an inner surface of a flange of a material 1 to be rolled. The sleeve is provided so that the position can be adjusted in the direction of the rotation axis of the sleeve, and is capable of restraining the outer surface of the flange of the material to be rolled and simultaneously lowering the flange tip.
An edger mill 100 comprising two stages of an edger roll 96 having an arbor 92 and a sleeve 94.
A parallel surface 106 'in which a surface facing the 94 is maintained parallel to the rotation axis of the arbor 92, and an inclined surface which presses down the flange tip.
106 '', and the angle formed by the inclined surface 106 '' with respect to the rotation axis of the arbor 92 is made equal to the angle formed by the flange surface of the material 1 to be rolled with respect to the vertical direction. A feature is an edger mill for rolling H-section steel. 2. Rolling a coarse billet with a universal coarse mill group comprising a coarse universal mill and an edger mill,
A method of rolling an H-section steel, which is thereafter finish-rolled by a finish universal mill, wherein the edger mill according to claim 1 is used as the edger mill, and the sleeve 94 is provided every pass or every several passes of the universal rough mill group. By moving in the arbor rotation axis direction, the inner surface of the flange of the material to be rolled is restrained by the convex portion of the arbor 92, and the sleeve 94 further restrains the outer surface of the flange of the material to be rolled. A method for rolling an edger mill for H-beams, wherein at least the last one or several passes are performed by rolling down the entire front end of the flange of the material to be rolled on the inclined surface 106 '' of the sleeve 94.