JP2642447B2 - Rolling equipment row for profiled material with flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention relates to a section having a flange, for example, an H-section steel, I
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a row of rolling mills for producing a product (hereinafter, referred to as an expanded shape) in which a hole is formed in a web portion in a shape material such as a shape steel.

[Prior Art] An expanded section 10 having an H-shaped cross section as shown in FIG. 7 is a section in which a hole 10b is formed in a web portion 10a. If the weight is constant, higher rigidity can be obtained. Conversely, the same rigidity can reduce the weight, so that it is used for structural members such as beams of building structures.

Means for forming the expanded section material include JP-B-53-12467, JP-B-55-42652 and JP-B-45-83.
The technology of each of the publications is known. That is, JP-B-53-1246
No. 7 and Japanese Patent Publication No. 55-42652 are provided with at least two or more slit rows (grooves) alternately at predetermined intervals in the longitudinal direction of the abdomen (web part) of a metal strip or mold, Immediately thereafter, a method and a device for cold bending rolling by a group of small pressure rolls arranged close to each other and stretching and expanding the abdomen into lattices, and Japanese Patent Publication No. 45-8337 in advance in the longitudinal direction of the web of the joist A method and apparatus for forming a paired truss by providing a plurality of unit devices each having two pairs of eccentric rollers arranged at relative positions after arranging appropriate charging, and gradually expanding the charging portion to form a pair of trusses. .

However, the above-mentioned JP-B-53-12467 and JP-B-55-426
In the No. 52 technology, the deformation resistance of the material is remarkably large due to the cold rolling, so that it is difficult to form a large cross-sectional shape, and the distortion due to bending is caused by the root of the web and the flange (hereinafter referred to as the corner portion). ) And work-hardened, resulting in reduced strength properties and easy breakage at corners, which limits its use as a large structural section steel.

In the latter Japanese Patent Publication No. 45-8337, the lower end surface of the eccentric roller is arranged so as to be pressed against the web surface.However, since the rotating surface of this roller is parallel to the web surface, the web surface has seizure flaws or Scratch flaws occur, and depending on the variation in the web thickness of the material to be rolled, a situation may occur in which the material cannot be passed between the rollers. Therefore, in order to solve such problems, it is necessary to provide a gap at least 2 to 5 mm on one side between the lower end surface of the eccentric roller and the web surface. However, when a gap is provided, the corners at both ends in the web width direction are pulled without being subjected to pressure reduction, so that the portion is narrowed, and the degree of material deterioration is large. Further, there is a problem that a recess is formed in the outer central portion of the flange, and it is not easy to flatten the flange surface only by finish rolling.

[Problems to be Solved by the Invention] As described above, in the conventional method of manufacturing expanded material, it is an extremely important problem to eliminate the deterioration of the material at the corners at both ends in the web width direction and the deterioration of the shape of the flange. In view of the above, the present invention has been made to solve these problems and to provide a novel manufacturing process capable of separately producing expanded shapes of various sizes and mass production.

[Means and Actions for Solving the Problems] FIG. 1 shows an outline of a rolling mill row of the present invention. In the figure, a rough rolling step 1 is a step of performing rough rolling of a material to be rolled using, for example, a known breakdown mill, and a step of rolling an intermediate rough-rolled material having an H section using a raw steel slab or a slab. . The intermediate rolling step 2 is a step in which the universal mill 2a and the edging mill 2b are arranged close to each other, and the intermediate rough rolled material is further rolled by reciprocating rolling to obtain an intermediate finished rolled material having a substantially final product in cross-sectional shape.

A feature of the present invention is that, following the intermediate rolling step 2, a groove forming apparatus 3 for forming one or a plurality of grooves on the upper and lower surfaces of the web of the material to be rolled. And a web widening device 4 that widens in the direction and widens the groove to form a hole. The finishing mill 5 provided at the subsequent stage of the web widening device 4 has the same structure as the finishing universal mill in the conventional H-beam rolling mill row, and is formed into a flange shape and a web shape of the cross section of the final product.

Subsequently, the configuration of the groove forming device 3 will be further described. The groove forming apparatus 3 shown in FIG. 2A has a pair of upper and lower shafts 32a, 32b rotatably supported by a housing 31, and an outer periphery of the shafts at appropriate intervals in the width direction of each shaft. It comprises a plurality of disk blades 33a, 33b protruding from the surface. The shafts 32a and 32b are configured so that the shafts 32a and 32b are rotated synchronously by gears 34a and 34b. FIG. 2 (b) shows the second
The disk blades 33a, 33b and the web portion 10a of the material to be rolled in FIG.
A gap of δ is set between the tips of the disk blades 33a and 33b, and only the thickness of δ is set at the center in the thickness direction of the web portion 10a cut by the disk blades. The grooves remain on the upper and lower surfaces. In addition,
If the groove thickness δ is too large, the web enlarging device 4 described later
The size of the left and right holes after widening rolling becomes unbalanced, but it is not possible to open well-balanced holes in the widening process by increasing the mill rigidity of the groove forming device as much as possible and making the groove thickness as small as possible. It is possible.

Next, an example of the disk blade shape will be described in more detail with reference to FIGS. 3A and 3B. However, since the upper and lower disk blades 33a and 33b have the same shape, only the upper disk blade 33a will be described in the figure. On the peripheral surface of the disk blade 33a, a concave portion and a convex portion are divided and formed at an equal angle, and in the illustrated example, the peripheral length 1 of one convex portion and the virtual peripheral length m of the concave portion are 3l + 3m = the entire peripheral length. Like that. FIG. 3B shows an example of the shape of the cutting edge, and an appropriate cutting edge angle α is set.

FIG. 4 shows an example of a pattern of grooves 10c formed on the web surface of the material to be rolled by a disk blade.
a, 33b are paired up and down, and three sets are provided in the width direction of the shaft body, and the first and third rows of disk blades are fixed at the same position with respect to the shaft body, and only the second row of disk blades is different. This is the case where it is shifted to the position and fixed. That is, by using the groove forming apparatus as described above, three discontinuous grooves are formed on the upper and lower surfaces of the web in the longitudinal direction of the material to be rolled. When a single row of discontinuous grooves is formed, it is needless to say that only a pair of disk blades need to be provided on the shafts 32a and 32b.

Next, the web widening device will be described. 5 (a) and 5 (b) show a web widening device 4 according to the first aspect of the present invention. This apparatus uses a means for spreading the web in the width direction by a skew roll method previously proposed by the present applicant in Japanese Patent Application No. 58-77391 (Japanese Patent Application Laid-Open No. 59-202101). In the figure, widening rolls 41a, 41b, 41
a ', 41b' is disposed inside the inner lateral and bottom flange of the upper flange of the rolled material, the axis of each roll is set at a predetermined angle theta _H with respect to a plane perpendicular to the rolling direction . Further, corner portions C at both ends in the web width direction of the material to be rolled.
Are configured to be reduced on the outer surface of these widening rolls. The rolling force of the widening roll against the corner portion C acts in the direction of widening the web, and the groove 10c formed in the web portion 10a widens in the width direction to form a hole portion 10b.

FIG. 6 shows a web widening device 4 according to a second aspect of the present invention, in which a support shaft 43 provided on a roll chock 42 is parallel to a rolling direction and a predetermined angle with respect to a surface perpendicular to the web surface of the material to be rolled. angle theta _V is set at, this support shaft 43 is widening rolls 44 of frame type or bead-type is rotatably supported, corners of the rolled material at an outer surface of the widening roll 44 C And the groove 10c formed in the web portion 10a is widened in the width direction in the same manner as the skew-type widening roll. The backup roll 45 is provided to back up from the opposite side of the widening roll that lowers the corner C.

By arranging the web widening device having the above configuration at the subsequent stage of the groove forming device, the web widening device not only presses the inner surface of the flange but also presses down or presses the corners C at both ends in the web width direction and the web. While widening the web, there is no dent at the center of the flange outside caused when only the inner surface of the flange is pushed and expanded by the conventional means, and there is no problem of material deterioration at the corner, and the corner is pressed down. It also has the effect of increasing the discipline.

By the way, the shafts 32a and 32b of the groove forming device 3 and the rolls of the web widening device 4 are all rotated by independent driving sources for each device, or the distance between the intermediate rolling process and the finish rolling process is continuous. In the case where it is close to being rollable, the driving source can be omitted. That is, when the material to be rolled is engaged with the groove forming device 3 and the web widening device 4, rolling is performed by pushing in the intermediate rolling process 2. 5 and at the same time, drawing and rolling in the finish rolling step 5 may be performed.

[Example] An example is shown below in which an expanded section is manufactured by an apparatus row combining the method shown in Fig. 2 as the groove forming apparatus 3 and the skew roll method shown in Fig. 5 as the web widening apparatus 4. The main production conditions are shown in Table 1, and the final product obtained under these production conditions is shown in FIG.

A good product was obtained from the expanded section produced according to this example without any shape defects such as constriction at the corners and dents on the outer surface of the flange. FIG. 8 shows a photograph of the structure of the corners and the flanges at both ends in the web width direction of the final product expanded shape material. It can be seen that the grains are fine and sufficiently forged.

By the way, when rolling a normal H-section steel by the above-described conventional skew roll method, constriction may occur at both ends of the web, and measures such as adding an extra wall thickness to the web portion are required. However, when the expanded section is rolled by the apparatus of the present invention, as shown in FIG. 9, necking is less likely to occur than in the above-described ordinary section steel. That is, in a normal H-shaped steel, a narrowing phenomenon in which the web thickness decreases at both ends in the web width direction is seen,
In the expanded section, the reduction in web thickness is minimal. Therefore, it is possible to reduce the additional amount of the extra thickness and to reduce the radial load.

Further, as shown in FIG. 10, the expanded section material requires a smaller thrust load acting on the widening roll than the ordinary H-section steel sheet is widened, so that the rigidity and strength of the rolling mill can be reduced, so that a more compact form is achieved. Expanded sections can be made by structure. In particular, in the case of the skewed roll method, the width can be freely widened by one roll, so that an expanded shape material can be formed more efficiently.

Furthermore, by changing the setting conditions of the groove forming device and the web widening device, it is possible to form expanded shapes having various web heights and various hole sizes, and the known roll width of the horizontal roll of the universal mill in the finish rolling process is used. The use of the arbitrarily variable body width roll further increases the degree of freedom in online dimensional change.

[Effect of the Invention] By using the rolling mill row of the present invention, it can be used for intelligent buildings or steel reinforced concrete (SRC).
Expanded sections of various sizes, which are expected to be demanded as high-performance sections for construction, without causing local material deterioration,
In addition, they can be formed efficiently without any problem in shape. Further, the apparatus of the present invention can produce an expanded section simply by providing a groove forming apparatus and a web widening apparatus in an existing row of section steel mills, so that an industrial effect is extremely large, such as a reduction in equipment cost.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of the apparatus row of the present invention, FIG. 2 (a) is a schematic front view of the groove forming apparatus of the present invention, (b) is a partially enlarged view of FIG. 2 (a), and FIG. 3 (a). Is a schematic side view showing a disk blade shape of the groove forming apparatus, FIG. 3 (b) is a front partial cross-sectional view of the disk blade, FIG. 4 is a schematic plan view showing a groove processing pattern formed in the rolled material web portion, FIG. 5 (a) is a schematic plan view showing a widening state by a skew roll type web widening device,
FIG. 6 (b) is a partially cut front schematic view showing a widened state, FIG. 6 is a partially cut front schematic view showing a widened state by a piece-type roll type web widening device, FIG. 7 (a) is a schematic plan view of an expanded section, (B) is a front view cut in the AA direction of FIG. 7 (a), FIG. 8 is a photograph of the structure of the expanded profile manufactured by the apparatus of the present invention, and FIG. 9 is a web thickness at a position in the profile web width direction. FIG. 10 is a graph showing a change, and FIG. 10 is a graph showing a difference in a thrust load between a normal profile and an expanded profile. 1 ... Rough rolling process, 2 ... Intermediate rolling process, 3 ... Groove forming device, 4 ... Web widening device, 5 ... Finish rolling process,
31 Housing 32a 32b Shaft 33a 33b Disk blade 34a 34b Gear 41a 41b 41a '41b'
Skewed roll, 44 ... piece-shaped roll.

Claims (3)

(57) [Claims] 1. A method of rolling a profile having a flange comprising a rough rolling step, an intermediate rolling step, and a finish rolling step, wherein the upper and lower surfaces of the web in the longitudinal direction of the material to be rolled are interposed between the intermediate rolling step and the finish rolling step. A groove forming device for forming one or a plurality of discontinuous grooves, and a web widening device having a pair of right and left widening rolls that contact at least corners at both ends in the web width direction of the material to be rolled. A row of profile rolling equipment having flanges. 2. A rolling apparatus columns of profiles having flanges according to claim 1 having a web widening apparatus set at a predetermined angle theta _H the axis of the widening roll with respect to a plane perpendicular to the rolling direction. 3. A predetermined angle θ _{V with} respect to a plane parallel to the rolling direction and perpendicular to the web surface of the material to be rolled.
2. An apparatus according to claim 1, further comprising a web widening device set to the following.