JP6287922B2 - Coarse shape billet manufacturing method and manufacturing apparatus - Google Patents

Description

  The present invention relates to a technique for producing a dog-bone-shaped rough steel slab, which is a rolling material for H-section steel, from a slab having a rectangular cross section.

  In general, when manufacturing a dog-bone-shaped rough steel slab, which is a rolling material for H-section steel, from a slab having a rectangular cross section, the slab having a rectangular cross section is provided with a perforated roll as shown in FIG. Use multiple passes for reciprocating rolling. At this time, the short side portion of the slab is rolled from above and below by a projection called a belly to secure the portions to be both flanges to obtain a rough steel slab.

JP 2004-98146 A

However, in the above-described conventional technology, although positioned by the berry, there is a risk of falling or buckling during the berry interrupt rolling, resulting in a dimensional defect or rolling inhibition.
In addition, when the centering is displaced due to the difference in the material bite, a deviation occurs in the cross-sectional area of the portion corresponding to the flange, which adversely affects the product dimensions.
The present invention has been made paying attention to the above points, and has an object to manufacture a coarse steel slab with higher accuracy.

  In order to solve the problem, according to one aspect of the present invention, when a slab having a rectangular cross section is produced by rolling a slab having a rectangular cross section to produce a dog-bone-shaped rough steel slab that serves as a rolling material for H-section steel, In the state where the lower surface of the slab is supported by a table roller along the longitudinal direction of the slab, rolling is sequentially performed by a plurality of pairs of vertical rolling rolls from the left and right width direction, and the rolling surface of each vertical rolling roll is directed toward the center portion of the slab thickness. The berry which is the protrusion part which protrudes is provided, It is characterized by the above-mentioned.

According to the present invention, rolling is performed while the slab is restrained by the table roller by the weight of the slab itself during rolling. As a result, the falling and buckling of the slab during rolling can be suppressed.
In addition, since the table roller and the web surface are in contact with each other due to the weight of the slab, it is possible to suppress centering deviation at the time of interruption by a belly.
As described above, according to the present invention, it is possible to manufacture a rough steel slab with higher accuracy.

It is a schematic plan view for demonstrating the manufacturing apparatus of the rough shaped steel piece which concerns on embodiment based on this invention. It is a figure explaining the shape of the rolling surface of each vertical roll which concerns on embodiment based on this invention, and the state before and behind rolling.

Next, embodiments of the present invention will be described with reference to the drawings.
(Constitution)
As shown in FIG. 1, the manufacturing apparatus for the rough steel slab 20 of the present embodiment includes a table roller 1 on which a slab 2 having a rectangular cross section is placed, and a plurality of pairs of rolling rolls 3A for reducing the width of the slab 2; 3B and 3C columns.

As shown in FIG. 1, the table roller 1 has a plurality of rollers arranged side by side along the rolling direction. The slab 2 is placed on the table roller 1 so as to be supported on the table roller 1 with the slab longitudinal direction facing the rolling direction.
Each of the rolling rolls 3A, 3B, and 3C is a vertical rolling roll 3A, 3B, and 3C for reducing the slab 2 from both sides in the width direction, and the rotation axis is set in the vertical direction. Moreover, each rolling roll 3A, 3B, 3C is rotationally driven by the drive device 4 in the same direction, respectively.

In FIG. 1, three pairs of rolling rolls 3A, 3B, 3C are illustrated. Here, the plurality of pairs of rolls may be four or more pairs, or may be selected from a plurality of pairs of rolls and used under a width reduction depending on the rough steel piece 20 to be formed.
On the roll surface of each rolling roll 3A, 3B, 3C, as shown in FIG. 2, hole molds 3Aa, 3Ba, 3Ca having berries 3Ab, 3Bb, 3Cb which are projections at the center are formed. .

The three pairs of rolling rolls 3A, 3B, 3C are arranged along the rolling direction. Here, it is preferable that the roller of the table roller 1 is arrange | positioned between rolling roll 3A, 3B, 3C which opposes in each slab 2 width direction.
The roll diameters of the pairs of rolling rolls 3A, 3B, and 3C facing each other in the width direction and the hole molds 3Aa, 3Ba, and 3Ca have the same shape. Further, as the rolls of the rolling rolls 3A, 3B, and 3C increase in diameter from the upstream to the downstream (from the upper side to the lower side in FIG. 1) in the rolling direction, The height is set low and the base is wide.

(Operation other)
As shown in FIGS. 1 and 2, a slab 2 having a rectangular cross section heated in a heating furnace is placed on a table roller 1 with the width direction (short side direction) facing left and right, and three pairs of slabs 2 are placed. It is conveyed toward the rows of rolling rolls 3A, 3B, 3C. The position of the slab 2 is centered by a tentering device so that the center part in the width direction of the slab 2 is positioned at the center of the rolling rolls 3A, 3B, 3C.
As shown in FIG. 2, the slab 2 sent between the three pairs of rolling rolls 3A, 3B, and 3C is subjected to rolling under a width reduction by the rolling rolls 3A, 3B, and 3C that form each pair, and gradually It is formed into a target dog-bone shaped rough steel piece 20.

(Effect of this embodiment)
(1) In a state where the lower surface of the slab 2 having a rectangular cross section is supported by the table roller 1 along the longitudinal direction of the slab, rolling is sequentially performed by a plurality of pairs of vertical rolling rolls 3A, 3B, 3C from the left-right width direction. On the rolling surface of each of the vertical rolling rolls 3A, 3B, 3C, hole molds 3Aa, 3Ba, 3Ca provided with berries 3Ab, 3Bb, 3Cb which are projections protruding toward the center of the slab thickness are formed. Yes.

According to this configuration, the slab 2 is rolled while being restrained by the table roller 1 due to the weight of the slab 2 itself during rolling. As a result, the falling and buckling of the slab 2 during rolling can be suppressed.
Further, since the table roller 1 and the web surface are in contact with each other due to the weight of the slab 2, the centering shift can be suppressed at the time of interruption by the belly 3Ab, 3Bb, 3Cb.
As described above, according to the present invention, the rough steel slab 20 can be manufactured with higher accuracy.
In addition, by changing the setting of the reduction amount without changing the roll, it becomes possible to manufacture the rough shaped steel pieces 20 of various sizes.

(2) A plurality of pairs of vertical rolling rolls 3A, 3B, 3C are arranged in the slab longitudinal direction.
According to this configuration, since the rough shaped steel slab 20 is manufactured by continuously reducing the width from the width direction, instead of the conventional multi-pass reciprocating rolling, the manufacturing time is shortened. It is possible to further suppress the temperature drop of.
(3) The vertical slabs 3 </ b> A, 3 </ b> B, and 3 </ b> C are rotationally driven to convey the slab 2 along the table roller 1.
According to this configuration, the slab 2 can be conveyed in the rolling direction while performing edging rolling with the rolling rolls 3A, 3B, and 3C.

DESCRIPTION OF SYMBOLS 1 Table roller 2 Slab 3A, 3B, 3C Vertical rolling roll 3Aa, 3Ba, 3Ca Hole type | mold 3Ab, 3Bb, 3Cb Berry 4 Drive apparatus 20 Coarse shape steel piece

Claims (4)

When manufacturing a dog-bone-shaped rough steel slab, which is a rolled material for H-section steel, by rolling a rectangular cross section slab,
A plurality of pairs of vertical rolling rolls that are paired on the left and right, and a table roller in which rollers are arranged between each pair of the plurality of pairs of vertical rolling rolls,
The lower surface of the slab of the rectangular cross-section while supported by the table rollers along the slab longitudinal direction, successively rolling the lateral width direction perpendicular rolling rolls of the pairs,
2. A method for producing a rough shaped steel slab, wherein a berry, which is a protrusion protruding toward the center of the slab thickness, is provided on the rolling surface of each vertical rolling roll.   2. The rough rolling according to claim 1, wherein the plurality of pairs of vertical rolling rolls are arranged in a longitudinal direction of the slab and each vertical rolling roll is driven to rotate to convey the slab along a table roller. A method of manufacturing a shaped steel piece. An apparatus for producing a rough shaped steel slab for producing a dogbone-shaped rough shaped steel slab that is a rolled material for H-section steel by rolling a slab having a rectangular cross section,
A table roller that supports the lower surface of the rectangular cross-section slab along the longitudinal direction of the slab;
A plurality of pairs of vertical rolling rolls arranged in the longitudinal direction of the slabs supported by the table rollers, each of which reduces the width of the slab from the lateral width direction,
A roll of the table roller is disposed between each pair of the plurality of pairs of vertical rolling rolls;
The apparatus for producing a rough steel slab, wherein a berry, which is a protrusion protruding toward the center of the slab thickness, is formed on the rolling surface of each vertical rolling roll.   4. The apparatus for producing a rough steel slab according to claim 3, wherein the plurality of pairs of vertical rolling rolls are rotationally driven.

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