JPS6182902A - Manufacture of h-beam - Google Patents

Abstract

PURPOSE:To obtain an H-beam whose flange-end is excellent in shape by using, in sequence, two kinds of calibers different from each other in an included angle between a rolling-down surface of flange-end and a corresponding surface of flange inner-surface. CONSTITUTION:In an edging mill of a group of roughing universal mills, the 1st caliber 34 and the 2nd caliber 33 are provided to upper and lower edging rolls. The 2nd caliber 33 is formed so that the included angle theta2 between each of the rolling down surfaces 31, 31' of flange-ends and each of the corresponding surfaces 31a, 31a' of flange inner-surface is 85-89 deg.. The 1st caliber 34 is formed so that the included angle theta1 between each of the rolling down surfaces 32, 32' of flange-ends and each of the corresponding surfaces 32a, 32a' of flange inner-surfaces is approximately 90 deg.. In the 1st half several passes, rolling is performed through the 2nd caliber 33 and an universal mill. In the latter half, rolling is performed by the 1st caliber 34 and a roughing universal mill 4, by moving the caliber position of edging mill along a roll axis by the distance L1 between the centers of both calibers 34, 33. By this rough rolling, the flange end is well formed.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Field of Application The present invention relates to a method for manufacturing H-beam steel, and more specifically, in an edger mill during rough universal rolling, a flange tip reduction surface and a flange inner surface corresponding surface are By using a roll with two types of holes with different angles θ between them, and using these holes properly in the first half and the second half of rough rolling, the flange tip can be shaped and rolled to improve the flange tip shape. The present invention relates to a method of manufacturing an excellent H-beam steel.

Conventional technology Generally, H-beams are manufactured by a universal rolling mill train as shown in Fig. 7. This rolling mill train consists of a breakdown mill 1, a roughing universal mill group 2, and a finishing universal mill. The roughening universal mill group 2 consists of a universal rolling mill 14 and an edger mill 5.

That is, first, an H-shaped phase steel piece 6 as shown in FIG. 8 is rolled in the breakdown mill 1 and sent to the rough universal mill group 2. In universal rolling mill 4, the 9th
As shown in the figure, the horizontal roll H. At the same time as the web portion 7 is rolled down by the horizontal roll H. The side surface of H' and the vertical roll 12.12' are applied to the -C norange part 8.8' by 1±, and this universal pressure 'Bf is applied to As shown in FIG. 10, the flange end is shaped by upper and lower rolls 13, 13'. The roll gap is narrowed sequentially with each pass of the rolling mill, and the material is passed back and forth in multiple passes. After rolling the rough shaped steel slab to a predetermined wear thickness and 7 lunge thickness, it is sent to the Nibar Mill 3 for finishing. Then, the web portion is lightly rolled down using horizontal rolls, and at the same time, the bending of the flange portion is pressed and shaped using vertical rolls, and the rolling mill is completed to produce an H-section steel.

By the way, in the conventional rolling method described above, when the flange end is shaped and rolled by the upper and lower rolls 13, 13' of the edger mill 5 of the rough universal mill group 2, the outer surface 10 of the flange end of the material undergoes deformation as shown in FIG. Since it is not restrained as shown in Figure H, only the nail corresponding to the reduction level of the tip of the flange protrudes as 75 and 10 as shown in Figure H, and at the same time,
A part 9 of the inner corner of the flange end of the rough shaped steel piece 6 rolled in the breakdown 1 (see Fig. 8) ff Since it has a chamfered shape, the inner corner of the flange end of the edger roll corresponds to the part 14. There is a phenomenon in which it is difficult to fill the material 1F to the corners (see Figure H).

Therefore, when the flange was then rolled by the universal rolling mill 4, the flange 7 on the outer surface of the flange was rolled and expanded in the width direction of the flange as shown in FIG. 12, and the inner corner 9 was chipped. It becomes a shape. The shape of the flange tip is improved by rolling the flange tip with the edge mill 5 and the flange thickness with the universal rolling mill 4, but the shape of the flange tip is improved by repeating the rolling passes. After being rolled! The protrusion 15 on the outside of the flange tip and the corner ridge 16 on the inside remain in the II product as well, and this phenomenon is more likely to occur as the product has a thicker flange.

``Problems that Teimei is trying to solve'' are intended to solve the above-mentioned drawbacks, specifically (i. - The purpose is to solve the problem of the flange tip shape of the 1yJ product as shown in Fig. 13 due to the occurrence of blinding.

In order to solve the problems of the conventional structure, the present invention provides a rough universal group consisting of a breakdown mill, a universal rolling mill and an edge mill, and a finishing universal mill for rolling. and H-shaped steel
! When manufacturing, the edger mill of this rough universal mill has a first hole mold in which the angle 0 between the tip of the 7 flange and the surface corresponding to the inner surface of the flange is set to approximately 90°, and this angle θ. Upper and lower rolls having a second groove set at 85° to 896 degrees are arranged, and the upper and lower rolls or the edger
The mill pressure 5if, R itself has a structure that can move freely in the roll axis direction, and in the first half of the multiple passes in the rough universal group, rolling is performed by the second hole of the edger mill and the rough universal rolling machine. In the second half pass, the first hole of the edger mill is moved to the position where the first hole was, the first hole and the rough universal rolling mill are used to roll the flange tip, and then the finishing step is carried out. Characterized by rolling.

Therefore, the present invention will be explained in more detail with reference to FIG. 1 and FIG. 2 as follows.

First, in the present invention, as in the conventional example, as shown in the rolling mill row shown in FIG. Rough rolling is performed, and then finish rolling is performed using a finishing universal mill 3. At this time, in the L-edge mill 5 of the rough universal mill 2, the upper and lower edger rolls are provided with a first hole mold 34 and a second hole mold 33, as shown in FIG. These two hole types 34 and 33 are structured so that they can be moved in the roll axis direction at any timing during rolling by moving the rolls or moving the entire pressure 'Ii, ljl, and these two types of hole types can be used selectively. and rough rolling.

Two types of holes placed on the edger roll 34.3
3 has a gastric shape corresponding to the tip of the 7-lunge, and as shown in FIG. 1, the second hole mold 33 has a flange tip-reducing surface 31. 318' and the flange tip reduction surface 31.
31' is configured such that the angle θ2 is 85@~89°, and the first hole mold 34 is formed on the flange tip reduction surface 32.32'
The angle θ1 of the flange tip reduction surface 32.32' is approximately 9 between
It is configured to form an angle of 0°. Therefore, in the first few passes of rolling with the coarse universal mill group, the second hole 33
In the second half, the distance between the centers of the two hole dies is changed, and the hole IQ shield of the takeedge mill is moved along the roll axis. Rolling is performed using a rolling mill 4.

By performing rough rolling in this manner, the flange tip shape can be well shaped.

That is, FIGS. 2, 3, and 4 are explanatory views of the deformation of the material when rolled as described above,
In particular, in FIGS. 2 and 3, for convenience of explanation, the angles θ1 and θ2 of the first hole type and the second hole type are the general angles θ, and 7 flange tip reduction surfaces 31.31' and 32.32. ’ is a general 7 flange tip reduction surface 21, flange inner surface corresponding surface 3
1a, 3+a', 32a, 32a' are generally 7
It is shown as a surface 22 corresponding to the inner surface of the lunge.

First, the flange end rolling surface 21 and the flange inner surface corresponding surface 2 of the second hole mold 34 of the edger roll used in the first half pass.
The angle θ formed by 2 is smaller than 90°, that is, 85″°
It is set in the range of ~89°.

When the 7-lunge end is shaped and rolled with this second hole die, outward 75 and dimples 10 occur as shown in FIG. As shown in FIG. 12, the outer surface side of the 7-lunge tip is not taller, but the inner surface side is shaped and rolled into a 7-lunge tip shape that is higher as shown in FIG.

Next, when changing to the first hole mold 33 in the second half pass, the first hole mold 33 has an angle θ between the flange 5'E ON reduction surface 21 and the 7 flange inner surface 22 of approximately 90 pa. With this first hole mold 33, 7 runs are made on the inner surface side in the first half pass.
When a material with a raised flange tip is rolled, the inner corner 9 of the flange tip of the material also begins to hit the roll, as shown in Fig. 5, so a small corner drop occurs on the corner 9 before that. Even if there is, the material is pushed to the edge of the corner of the roll, and the corner drop is eliminated or the corner drop becomes smaller. On the other hand, since the amount of reduction of a portion of the outer corner of the flange is smaller than that of the inner corner, this rolling does not cause the large 25.degree. Therefore, the flange base Vllj in this first hole mold 33
After performing one or more passes of TEA rolling, finishing rolling is carried out using the finishing universal rolling mill 3, thereby making it possible to obtain a product with good perpendicularity at the tip of the flange and no corner drop.

In addition, in order to reduce the amount of movement of the edger mill in the roll axis direction when changing the two hole shapes and shorten the time required to change the hole shape, the flange tip reduction surface 31 is moved as shown in FIG. It is also possible to wrap the first hole mold 34 consisting of . In the case of the opening, the distance 2 between the centers of both hole molds is less than half of the center open path @L I when the two hole molds are arranged independently on the same roll as shown in FIG.

In addition, the angle θ formed by the flange end rolling surface of the first hole die 34 used in the latter half of the rolling pass in the rough universal mill group and the corresponding surface of the inner surface of the 7 flange is determined by considering the perpendicularity of the flange tip of the product. , is normally set to 90°, but it is possible to shift the angle by 7f without changing 90° in consideration of changes during final universal rolling and cooling. In addition, the first flower type 34
The distance from the web 1 facing surface to the corresponding part of the inner corner of the flange tip l1iIIH. is set to be smaller than the hot reshaping value of the distance from the tip of the product's flange to the web surface, and set so that the web-compatible surface of the roll and the web surface of the material do not come into contact during rolling to shape the flange end.

Also, according to experiments, the angle θ2 between the flange end reduction surface of the second hole mold 33 used in the first half bus and the corresponding surface on the inner surface of the flange must be at least 1° smaller than the angle θ. As a result, the effect of improving the shape of the inside corner of the tip of the 7 lunge becomes noticeable in the second half pass, and if it is made too small, there will be a part that does not hit the roll near the outside corner of the tip of the flange in the second half pass, and on the contrary,
It makes the shape of the flange tip of the product bad. The minimum value of θ2 varies depending on conditions such as the flange thickness of the product and the amount of reduction in the first hole die 34, but if it is less than 85°, the shape of the outer corner of the flange tip tends to deteriorate. That is, various experiments have revealed that the appropriate HH for θ is 85° to 89°. In addition, the depth hl of the second hole mold 33 is set larger than the depth h2 of the first hole mold 34, and the amount of reduction of a part of the inner corner of the 7 flange in the first pass with the first hole mold 34 is determined. Increasing the number will improve the shape.

<Effects of the Invention> As explained in detail above, the method of the present invention has the following advantages when manufacturing H-section steel by rolling through a rough universal group consisting of a breakdown mill, a universal rolling mill, and an edger mill, and a finishing universal mill. In the edger mill of this rough universal mill, two hole types with different angles θ between the flange end rolling surface and the flange inner surface corresponding surface are used, and in combination with a universal rolling mill, rough rolling is performed to form the flange. This is a method in which the tip is shaped and then finish rolled.

Therefore, in the H-shaped steel product, the shape of the flange tip can be formed well, and a good product can be manufactured without any problems.

In addition, when the first and second hole molds are arranged so as to overlap each other, the movement space when changing the hole shape is not small, the manufacturing process is simplified, and the workability is improved.

[Brief explanation of drawings]

FIGS. 1 and 6 are explanatory views of a part of an example of an edger mill that implements the method of the present invention, and FIGS.
and FIG. 5 are explanatory diagrams of various forms of material deformation by the method of the present invention, FIG. 7 is a layout diagram of a general rolling mill IH, FIGS. 8, 9, 10, H, FIG. 12 and FIG. 13 are explanatory diagrams of various modifications of materials in the conventional example. Code 1...Breakdown mill 2...
Roughing universal mill group 3...Finishing universal mill 4...Universal rolling mill 5...Edge mill 6...Breakdown rolling of rough shaped steel Piece 7・
... Web 8 ... Flange 9
...Flange tip inner corner 10...
Flange tip outer corner H...Universal mill horizontal roll 12...Vertical roll 13...Edge roll 14...Edge roll inner flange corner corresponding part 21 ...Edger roll's flange end rolling surface 22...Edger roll's flange inner surface corresponding portion 23...Edger roll's web corresponding surface 24
・・・・・・Edgeer roll flange tip inner corner corresponding part 31.31′ ・・・・・・Edgeer roll flange tip rolled surface 32.32′ ・・・・・・Edgeer roll flange Tip rolling surfaces 31a, 31a' ... Surfaces corresponding to the inner surface of the flange of the edger roll 32a, 32a' ... Surfaces corresponding to the inner surface of the flange of the edger roll

Claims (1)

[Claims] When producing H-section steel by rolling through a rough universal group consisting of a breakdown mill, a universal rolling mill, and an edger mill, and a finishing universal mill, the edger mill of this rough universal mill group has a flange tip rolling surface and a flange inner surface corresponding surface. The angle θ between the two is approximately 90°.
Upper and lower rolls having a first hole type set at 85° and a second hole type set at an angle θ of 85° to 89° are arranged, and the upper and lower rolls or the rolling mill itself of the edger mill move in the roll axis direction. It has a movable structure, and in the first half of the multiple passes in the rough universal group, rough rolling is performed by the second hole of the edger mill and the universal rolling mill, and in the second half, the first hole of the edger mill is rolled by the second hole. A method for manufacturing an H-section steel, which comprises moving the mold to a position where the mold was, and then rough rolling it to shape the flange tip using a first hole mold and a universal rolling mill, and then finishing rolling.