JPS60130403A - Rolling method of t-beam - Google Patents

Abstract

PURPOSE:To eliminate almost or perfectly a complex and expensive, vertical axial-line rolling mill from the mill line of continuous rolling by installing a 3-roll type twisting machine between the mills at a proper stage of mill line. CONSTITUTION:A blank material 11A is rolled long to one side and is twisted to turn its long side to the downward direction by an ordinary 2-roll type twisting machine, to begin the formation of a part corresponding to a flange part and continue the rolling in the same direction. The rolled material is successively rolled by rolls 19-21, while turning it by approximately 90 deg. by a 3-roll type twisting machine 12, into a rough rolled material 11B having thick projecting parts Fa', Fb', W' corresponding to both wing parts of flange and a web part of a product T-beam 11D. The material 11B is successively formed into a rolling material 11C in sequence by turning it by the machine 12 and performing a rolling for the purpose of reducing the thickness of each part, and the material 11C is finished into a product 11D by the same turning and small reduction of thickness as mentioned above. The twisting machine 12 is installed by providing a relational angle between roll calibers and the machine 12 to it, so that the center lines of rolls 19-21 of the machine 12 are converged on the center of a pass line P of rolling material and the material is turned by a proportional angle equivalent to the proportional position of the distance L2 between the front and rear rolling mills.

Description

[Detailed description of the invention] The quasi-invention is a method for manufacturing T-beam steel by hot rolling, special V5%
This invention relates to a wire rolling method.

Figure 1 shows the cross-sectional shape of an example of T-shaped steel, and the flange part (F)
It consists of the Kueb section (W). The rolling direction for forming the wing parts (E'a) (Fb) on both sides of the flange part (P) and the rolling direction for forming the quench ff1l (W) are at right angles, so the rolling process is similar to that of a simple cross section. It is not as simple as in the case of rolled material.

Conventional rolling methods for T-section steel are roughly divided into open type and continuous type.
hl )(bl)(ha) are arranged in parallel and E[
= The rolled material passes back and forth in the direction of the notch J (a), and as shown in Fig. 1 (
(b) to (h) in Figure 2 (b) shown with σ corresponding to L4)
) is rolled in the order of the cross sections. Open type [In the first rolling, the rolled material can be rotated to the old island in a free state after passing through the rolling mill rolls, so in the illustrated example, between (C) and (d) and (g) (hJ Like the arrow inside
A rotation is made to change the downward direction of lf. However, open rolling requires a large space and equipment for reciprocating conveyance, is inferior in productivity to continuous rolling, and has drawbacks such as a large temperature drop in the rolled material during rolling.

In the continuous type, before the rear end of the rolled material passes through the front rolling mill roll, the leading end is bitten by the rear rolling mill roll, so the rolled material cannot be rotated in a free state. In this case, forcibly twisting and turning the rolled material between rolling mills may cause problems such as bending of the rolled material, which may disrupt the guiding properties, damage the rolled material, and reduce product forming accuracy. can be,
Conventionally, it has been difficult to give stable twist to rolled materials of this type of shape. Therefore, it was decided not to twist the rolled material on the way to Kawagoe, and the pass line (P
) Horizontal axis rolling along K @ 0++) (h+5
) (ha) (b7) (ha) A vertical axis rolling mill (Vl) (vs) (vs) was installed at an appropriate location between the rows of stages to enable rolling in the perpendicular direction. )
Rolling is performed in the order of the cross-sections shown in FIG. However, the vertical axis rolling mill has a more complicated structure and is more expensive than the horizontal axis If rolling mill, and the distance between the horizontal axis rolling mills is longer. Further, when channel steel and angle steel are produced simultaneously, problems arise such as the vertical axis lf rolling mill cannot be used.

The present invention has been devised to provide a solution to the above-mentioned problems of the prior art.
A twisting machine is installed between the f rolling mills, and this twisting machine is a 30-l type, the 10-l is for the outer surface of the flange part of the rolled material, and the other 20-l is for the both wings of the 7279 part of the rolled material. The inner surface of the part and 91
The central edges of r (shi, and 30-ra) are converged toward the center of the slide so that they face each other with a suitable clearance from both sides of the part 1, and intersect at the intersection point. VC is applied so that the VC is at least at the intersection of the flange part and the web part of the rolled material.Furthermore, the twisting angle given by the twisting machine is determined by the distance between the front rolling mill and the twisting machine, and the distance between the front and rear rolling mills. The ratio gives the ratio between the twisting angle of the rolled material given between the front rolling mill and the twisting machine and the turning angle to be given between the NU rear If rolling mill.By doing this, continuous rolling The rolling mill line consists of no or mostly 7ffi (vertical axis rolling mills).

EMBODIMENT OF THE INVENTION Hereinafter, the rolling method of the T-section steel of this invention will be explained in detail by an Example with FIGS. 4-9.

FIGS. 4(a) to 4(x) show the rolling process of the rolled material according to the present invention in accordance with the cross-sectional shape of the rolled material and the direction of the center of the square part.

The rolling material starting material (IIA) shown in Figure (B) is rolled into a long force as shown in Figure (B), and then twisted downward with a long force using a twisting machine consisting of two ordinary rollers, as shown in Figure 09. Start forming the vc flange #M part as shown in Figure 1) and continue rolling in the same direction as shown in Figure 1. This will be explained in more detail later in Figures 5.6 and 7. It is rotated by a twisting machine (E) and rolled as shown in the figure to obtain a rough rolled material (II
B).

811f rolled material (IIB) consists of both wing parts (Fa) (Fb) of the flange part and the web part (
Thick protrusions (Fa) (Fb) and (W) corresponding to
W). The above If rolling process can be regarded as first-stage rough rolling, and lfl: rolling is performed at a relatively large reduction rate for the purpose of forging and forming a set.

The 81 rolled material (IIB) was then rotated using a three-roll twisting machine and rolled for the purpose of reducing various parts.
Formed and rolled material (IIc) K in the order shown in Fig.
It is formed. Shaped rolled material (l IC) is a product T-shaped steel (I
ID), the flange part and the web part have similar shapes with slightly thicker walls, and these rolling processes can be regarded as intermediate forming rolling, and a very large rolling reduction is not applied.

Next, the shaped rolled material (item C) was turned by 30-type twisting and rolled with a small reduction factor, and the order of (1 sword figure, (nu) figure) KfR & JT section steel (IID) K finish larel was obtained.

These rolling processes can be regarded as post-stage finish rolling.

FIG. 5 shows an example of a 30-type twisting machine used in the present invention. This twisting machine (b) has center VcJ on machine frame a3.
The annular rotating frame O4 with 111 holes a→ rotates around the horizontal axis! It is rotatably supported by 1lVc, and the comb αη on the machine frame side meshes with the 4-m tooth sergeant formed on its outer periphery.
Due to the rotation of the form beating, the rotating frame 4 is rotated by a distance vVc around the center of the rotating frame 4, and is given an angular displacement with respect to the hole shape of the roll of the front horizontal axis rolling @(g) (see FIG. 7), and is stopped at that position.

Three rollers ul from the inner circumference of the rotating frame (c) toward the center.
ciQ■υ are approximately equiangularly arranged. that one roller a
I faces the outer surface of the flange part of the rolled material 4 at that stage,
Also, for the other two rollers) Qυ is [tE rolled material 7272
The inner surfaces of both wing parts of the part and each surface of the part 911 face each other, and are formed in a circumferential shape that matches the shape of the opposing part, but are made to face each other with an appropriate play gap. . Therefore, 30-ra (Ill @) & υ gives a twist of !5 to the angular displacement given to the rolled material (1υ) from the hu rolling mill passing between them, but in addition to that, pinch pressure,
The EE rolled material is relatively free i[
Care has been taken to allow TI to pass through.

The rolled material Qυ maintains the pass line given by the front rolling mill (G) and moves straight until it reaches the pass line (P) shown in Figure 6.
) is best twisted around the center. If the rolled material u〃 and the four rollers Qυ hit each other, and this causes bending, even the part of the roller that is the guide in front of the hole shape of the rear rolling mill (as shown in Figure 7) will bend. The guiding property is distorted, the rolled material Q is damaged, and the rolling forming is adversely affected.
This will result in poor product alignment and reduced dimensional accuracy. Therefore, in the present invention, the center line Q1 of the two halves of 30-ra Qlυ
It is most desirable that υ is focused toward the center of the pass line (P) and intersects, and that the point of intersection coincides with the center of the pass line (CP). It is better to do as shown in .

In the present invention, the turning angle given by the twisting machine @ is
As shown in Fig. 7, the distance M (L□) between the front rolling mill (G) and the twist @@ shown by three small circles, and the front and rear rolling mill (G)
g! The distance between 4! (Ls), the angle to be given between the forward rolling mill (G) and the twisting 11A (6) and the required turning angle to be given between the front and rear rolling mills (G) in the approximate relationship. Set the ratio. Between the twisting machine 4 and the rear rolling mill 0, the rolled material 0η undergoes a turn as a continuation of the forced twisting of the previous stage. should normally be 90°, but when rolling with a hole shape inclined at a small angle near the diagonal arrangement,
σ may be smaller than 9o0. In some cases, it may be 90 or more.

It is technically appropriate that the forced twisting angle that can be given by the front rolling t1k (c) and the twisting machine is about ten degrees. Then, a guide caster (c) is placed on the roll hole exit side of the front rolling mill (7).
If the twisting machine (b) K is provided with a forced twisting function of, for example, about 3 degrees, the burden placed on the twisting machine (b) can be reduced accordingly. The total rotation angle can be 90' or another set angle by adding the distance proportional rotation angle performed between the twister (2) and the rear ILE rolling machine (2) to the forced twist angle. If the twisting force and angle of one L-shaft or one twisting machine (6) is insufficient, it is also possible to install a plurality of twisting machines in a row.

Figure 8 (0) shows the arrangement of the rolling mill and twisting machine @ of the continuous rolling line in the rolling process of the embodiment of the present invention, which is different from Figure 4, and Figure 8 (B) shows the arrangement of the rolling mill and twisting machine @ of the rolling process of the embodiment of the present invention, which is different from Figure 4. The rolling mills are now all horizontal axis rolling mills (1) to (6) with the exception of one vertical axis rolling mill (7V).
) (8). Rolled material uu is rolled @ (3)
A right turn is performed between <4>, followed by a right turn between rolling mills (4) and (5), and an opposite left turn is performed between rolling mills (5 and 6). During this time, the flange part and 911 part are formed and Thickness reduction rolling is performed. Subsequently, after turning to the right between rolling mills (6) and (7V), post-stage finish rolling is performed at rolling mills (7) and (8).

Figure 9) i- shows the arrangement of the rolling mill and twisting machine @ of the continuous rolling lie/in the rolling process of the embodiment of the present invention, which is different from the embodiment of the present invention in the previous example. The torsion FIk4 indicated by 8 black marks shows the cross-sectional change process of the rolled material Uυ shown corresponding to the lower part of the rolling mill in Figure 9 U).
The rolling mills (1) to (8) are all horizontal axis rolling mills. It Nobu @ (1
) The rolled material subjected to preliminary rough rolling σ by (2) is rolled @
Between (2) and +3), there was a hard right turn and the machine moved to the middle stage of forming and rolling, and between (4), the rolling mill turned to the right, and the rolling mill (
4) Turn to the left between (5) and turn to the right between rolling mills (5) and (6). During this time, the forming and thinning of the flange and tweezers are carried out from rolling mills (3) to (6) K. After that, the rolling machine moves to the finish rolling stage VC.The rolling mill (6) and (7) rotate to the left, and between the rolling mills (7) and (8), the rolling machine rotates to the right, and then finishes rolling σ at the rolling mill (7) L8). In this way, the twisting machine (6) is not limited to the middle stage of forming and rolling, but also before and after, the rolled material has protrusions corresponding to the flange part and the curved part, and the 30-wheel can exert a twisting force. If the cross-sectional shape is suitable, it can be placed in the rolling mill line in consideration of the necessity of the rolling process order.

As can be inferred from the detailed explanation of the T-shaped steel above, the present invention is applicable to a rail having a head at the 911 part of the T-shaped steel, and can also be applied to other shaped steel to some extent within the range of rolling technology. It can be similarly applied by making some changes.

As described above, according to the present invention, it is possible to economically and advantageously construct a continuous rolling marchant mill capable of producing a wide variety of products in small quantities. In other words, in a continuous rolling line where the main purpose is continuous rolling of steel bars, an expensive and complicated vertical axis rolling mill is interposed between horizontal axis rolling mill rows in order to obtain rolled products of VC-quality without twisting the rolled material. When rolling T-shaped steel, angle shaped steel, groove shaped steel, T-shaped steel, etc., vertical axis rolling mills cannot be used or diverted, and the distance between horizontal axis rolling mills becomes long due to their failure. However, according to the present invention, all T-beams can be made of the same type. It becomes possible to produce steel with less burden, and it becomes possible to construct a short-distance intensive continuous rolling line mainly using an inexpensive horizontal axis rolling mill.

In addition, there are fewer troubles such as misrolls and hit points on the continuous rolling line, and the process of rolling down and thinning each part of the rolled material can be carried out smoothly and with less man-hours according to the if rolling schedule, improving product quality and improving product quality. In terms of quality, there are also effects such as being able to obtain good quality products with less scratches and reduced dimensional accuracy.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of an example of a product T-shaped steel, Figure 2 (A) is a plan view showing the rolling mill arrangement and the direction of transfer of the rolled material in the case of conventional open rolling, and Figure 2 (B). is a diagram showing the cross section of the corresponding rolled material in the order of change, Fig. 3) is a plan view showing the rolling mill arrangement in the case of conventional continuous rolling, and Fig. 3(b) is the diagram of the corresponding rolled material. Diagram showing the cross section in the order of change, Figure 40
) (knock (ha) (→ (ho) (he) (υ (i) (su) (nu)
5 is a diagram showing the rolling process of I=E rolled material according to the present invention in order according to the cross-sectional shape of the rolled material and the direction of the center of the square part, and FIG. 5 is an example of a 30-type twister used in the present invention. 6 is a diagram showing the angular relationship of each part of this twisting machine, FIG. 7 is a side view showing the relative arrangement of the front rolling mill, twisting machine, and rear rolling mill, and FIG. ) is a plan view showing the arrangement of a rolling mill and a twisting machine in the rolling process of another embodiment of the invention;
Figure 8 (b) is a diagram showing the cross section of the rolled material corresponding to Figure 8 (a), and Figure 9 (a) is a diagram showing the rolling process of another embodiment of the invention. FIG. 9B is a plan view showing the arrangement of the machine and the twisting machine, and FIG. 9B is a diagram showing the cross section of the rolled material shown in FIG. (1) (2) (3) (4) (5) (6) (
7) (8) --Horizontal axis rolling mill, (7V)...Vertical axis rolling mill, UL)...Rolled material, (IIA)...Starting material, (IIB)...Rough rolling material, (1ic)... - Formed and rolled material, (IID)...Product T-shaped steel, (to)...30 type twisting machine, (141...Through hole, Q[9...Circular turning e
, t, tcp... form gear, αη... form,...
・Roller center line, )・・Rear rolling mill, cap IΦ Kasten, (P)・・Pass line, CF)・・Flange part, (
Fa) (Fb) -- Both 11! Department, (W)--Queg Department,
(hl)(ha)(ha)(hl)(ha
)(ha)(ht)Cha)...Horizontal axis rolling mill, (vl)(V2)(v3)...Vertical axis rolling mill, (
,) -'-Rolling force forward arrow (b) (C) (d)
(e) (f) (g) (h) -- Cross section of rolled material.

Claims (1)

[Claims] In order to manufacture T-shaped steel by continuous hot rolling, a rough-rolled material 1 having both wings of the flange part of the product T-shaped steel and a thick protrusion of 5T is produced in the preliminary rough rolling.
Then, in the intermediate stage forming rolling, rolling is performed between the front rolling mill and the rear rolling mill using the horizontal axis rolling mill and a 30-hole twisting machine installed at the necessary turning points before and after the rolling mill. While applying approximately 90° torsion to #8, roll L1 to the thicker forming material from the product T-beam L1, followed by finish rolling to the product T-beam in the later stage finishing (1) rolling.
In this case, the Uσ twisting machine is configured such that its three rollers are distributed around the circumference so that their center lines converge at the center of the pass line of the rolled material, and the front LF rolling machine and the rear rolling machine A method for producing T-beams characterized by installing the Lt strip material at a fractional position of the distance from the machine by giving the relationship angle between the roll hole shape and the twisting machine so that the Lt strip material is forcibly twisted at the same fractional angle. .