JPS6174708A - Universal rolling mill - Google Patents

Abstract

PURPOSE:To form H-beams having different flange-widths from stocks of the same flange-widths by rolling, by decreasing the diameter of a vertical roll from the central part to the end of roll while changing the surface angle of roll, and slanting the opposite surface of a horizontal roll in conformity with said angle. CONSTITUTION:The diameter of a vertical roll 10 is made to be maximum at the central part in the longitudinal direction of roll body, and minimum at its end. That is, angles theta1, theta2 between the outer peripheral surfaces 10a, 10b and a vertical plane are changed once or more between the central part in the longitudinal direction of roll body and the end of roll. This change is performed so that the angle theta2 after changing is larger than the angle theta1 before changing. The surfaces 9a, 9b of a horizontal roll 9 opposite to the outer peripheral surfaces 10a, 10b, are formed into straight lines, bending on the way to the roll end. When a rough shaped billet is rolled by changing the relative position between the rolls 9 and 10, the billet is rolled so that the front end of an intial-pass flange becomes thicker, and the billet is rolled at the final pass so that the thickness of the front end and central part of flange are equal to each other.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Field of Application The present invention relates to a universal rolling mill, and more specifically, it can be applied as is to a normal rolling equipment train in a universal rolling mill used for rolling H-section steel. This invention relates to a roll-shaped universal rolling mill that can roll 11-section steel with different flange widths from materials with the same flange width.

Conventional technology Figure 3 shows a general universal rolling equipment train for H-beam steel.
It consists of a rough universal mill group 2 and a finishing universal mill 3, of which the rough universal mill group 2 consists of a rough universal mill R4 and an edger mill 5.

In this rolling mill N row, first, breakdown mill 1
Rolled into a rough shaped steel piece 6 with an H-shaped cross section as shown in Fig. 4,
As shown in FIG. 5, the web portion 6a of the rough shaped steel piece 6 is rolled down by the horizontal roll 1 of the rough universal rolling mill 4, and at the same time, the flange portion 6b is rolled down by the side surface of the horizontal roll 7 and the vertical roll 8. An edger mill 5 provided adjacent to the universal rolling mill 4 performs shaping rolling of the flange end. Rolling using a universal rolling mill and an edger mill is performed continuously, and rolling is performed in multiple passes by narrowing the roll gap with each pass and moving the material back and forth. As shown in FIG. 5, the pair of horizontal rolls 7.7 of the universal rolling mill used at this time have side surfaces inclined at a predetermined angle with respect to the vertical plane, and the outer circumferential surface of each vertical roll 8.8 is the horizontal roll 7.7. The diameter is maximized at the center of the length of the roll body so as to be parallel to the inclined side surface of the roll body.

Therefore, the material rolled to a predetermined wear thickness and flange thickness in the rough universal mill group 2 is subjected to light reduction of the wear part by the horizontal rolls of the finishing universal rolling mill 3, and at the same time,
In the rough universal rolling, the 7 lunges tilted outward are finished and compressed with the vertical rolls of the universal rolling mill 3.
H-section steel is manufactured.

However, recently, in order to promote the common use of materials for H-beams, various methods have been used to manufacture products with different flange widths (nice H-beams) from materials with the same flange width. One of the conventional methods is to roll a material with a narrow flange width to obtain a product as wide as possible.

FIG. 6, FIG. 7, and FIG. 8 are explanatory diagrams of rolling methods for widening the flange width, respectively.

First, as shown in FIG. 6, the rough universal rolling mill has a different angle of inclination of the side surface of the horizontal roll 12 and an angle of inclination of the outer peripheral surface of the vertical roll 11. The piece 6 is rolled into a thick cross-section with a thickness of 7 langes as it approaches the tip of the flange, and is then subjected to intermediate universal rolling iC rolling to widen the width by 7 langes.

Second, as shown in FIG. 7, a projection 13a is attached to the center of the vertical roll 13 of the rough universal rolling mill, and
As shown in the figure, a convex portion 14a is formed at the center of the roll body length of the vertical roll 14, and a thick portion is formed at the flange end of the rough shaped steel slab 6 by rolling with a rolling mill. This method involves rolling with a universal rolling mill to widen the flange width. However, these methods require a rough universal rolling mill to thicken the end of the 7 flange and an intermediate universal rolling mill to increase the thickness of the flange by 1, as shown in Figure 3. It cannot be applied to the conventional conventional rolling mill as shown in FIG.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks. Specifically, by rolling various H-section steels with different flange widths using the same 7-flange width material, If you want to get a wide range of products,
The purpose is to solve the problem of requiring a rough universal rolling mill and an intermediate universal rolling mill to roll the flange end thickly.

<Structure of the Invention> Means for solving the problem and its operation, that is, the present invention has a roll diameter that is maximum at the center of the roll body length and minimum at both ends of the roll body, and furthermore, the angle formed with the vertical plane is close to the roll body length. A vertical roll having a roll outer circumferential surface that is changed at least once from the center to both roll ends, and the angle after the change is larger than the angle before the change;
It is characterized by comprising a horizontal roll that is inclined so that a part of the facing surface of the side surface facing the roll outer peripheral surface of the vertical roll is parallel to the vertical roll outer peripheral surface.

Therefore, the structure and its operation as a means for solving this problem will be explained in more detail with reference to FIGS. 1 and 2 as follows.

Note that FIG. 1 is an explanatory diagram showing the roll shape of a universal rolling mill according to one embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the roll shape of a universal rolling mill according to one embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram of a deformed form of a rough shaped steel piece.

First, the present invention takes advantage of the fact that the relative positions of horizontal rolls and vertical rolls change with each pass in rough universal rolling. It was established based on the fact that the rolls of the rough universal rolling mill were configured to have a shape that could be rolled so that the thickness at the center of the seven flange and the tip were approximately equal in the final pass.

However, as shown in FIG. 1, in the present invention, the diameter of the pair of vertical rolls 10, 10 is maximum at the center of the roll body length, and decreases linearly toward both ends. Minimum.

This decrease in diameter is similar to the conventional example shown in FIG. The angle changes at least once from the center of the roll body length to both ends of the roll body, and this change is made so that the angle θ2 before the change becomes larger than the angle θ2 after the change. In addition, a pair of vertical rolls 10.10 are configured in a mouth-like shape, and each side surface of a pair of horizontal rolls 〇 and 9, in particular, each outer circumferential surface 10a, 101) of the vertical rolls is formed on each side surface. The opposing surfaces 9a and 9b are vertical rolls 10.1 in the final stage bus.
0 is approximately equal at each position of the flange portion of the rough-shaped steel piece 6, and is formed into a straight line bent in the middle so as to be parallel to each outer circumferential surface 10a, 10b of the vertical roll.

With a universal rolling mill equipped with horizontal rolls and vertical rolls configured in such a shape, by changing the relative positions of the horizontal rolls and vertical rolls and rolling, the rough-shaped steel billet can be rolled at the tip of the initial bus flange. It can be rolled so that the thickness becomes the same at the tip of the 7-lunge and at the center of the 7-lunge in the final stage bath.

1 and 2, the gap between the upper and lower horizontal rolls 9.9 in the final bus of rough universal rolling is tw, one opposing side surface 9a of the horizontal roll 9.9 and the vertical roll 10.
The gap between one outer circumferential surface 10a near the center of the vertical roll 10. When the distance from the reference position is a, the gap between the upper and lower horizontal rolls on the bus is Tw, and the distance from the reference position of the vertical roll is A (see Figure 2). The gap (1) near the center and the gap (2) near the end of the vertical roll 10.10 are expressed by the following equations (1) and (2), respectively.

■, = t, + FA-a) CO2O3+
1/2 (Tv-tw) sin θ, ------・
(1) T2= t2+ FA-alcO3θ2+ 1/
2(Tw-tv) sin θ2 (2) The amount of change in horizontal roll TV per pass on the bus on the way is △Tw,
If the amount of movement of the vertical roll is ΔA, the amount of change in the gap T between the side surface of the horizontal roll and the vertical roll, △■1, 8■2 is ΔT, = △A=cosθ, + 1/2ΔTw
・sin θ1 ・・・・・・(3) △T2=△A・co
sθ2+ 1/2ΔTw・sinθ2・・・・・・(4
).

The difference in the amount of change is △■2-6, -△A(CO5θ, -cosθ+
)+1/2△T'#(Sinθ2-5inθ1), and when θ1 and θ2 are in a small range, for example, 10° or less, ΔT2 > Δf1, that is, the amount of reduction at the tip of the flange is larger than at the center. , the flange widens due to the reduction balance.

By the way, when θ1=5° and θ2=10°, △A
-10, for the bus with △Tw = 6, △T, = 10.22,
ΔT2 = 10.37, and the rolling direction of the tip of the 7 flange is approximately 1.5g6 larger than the center of the flange.

<Effects of the Invention> As explained in detail above, in the present invention, the angle between the outer circumferential surface of the vertical roll of the universal rolling mill and the vertical plane is at least 1 from the center of the roll lHf% to the ends of both rolls. The angle θ2 after the change is made larger than the angle θ before the change, and at the same time, the opposing side surface of the horizontal roll is inclined parallel to the outer circumferential surface of the vertical roll.

Therefore, when rolled with this universal rolling mill, the amount of reduction of the rough shaped steel billet is thicker at the tip than at the center of the flange, making it possible to widen the flange width without any problems. , there is no need for an intermediate universal rolling mill, and it can be applied directly to a conventional conventional rolling mill train.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the roll arrangement of a universal rolling mill according to one embodiment of the present invention, and FIG. 2 is an explanatory diagram of the deformation of a rough-shaped steel billet during universal rolling by the rolling mill shown in FIG. 1. , Fig. 3 is an explanatory diagram of a conventional rolling equipment row for H-beam steel, Fig. 4 is an explanatory diagram of a cross section of a rough shaped steel slab after the breakdown rolling shown in Fig. Figures 6, 7, and 8 are explanatory diagrams of the general shape of a rough universal mill, and are examples of the shape of a conventional universal roll for seven-lung widening rolling. Code 1...Breakdown mill 2...
Rough universal mill group 3...Finish universal rolling compensation 4...
Rough universal rolling mill 5...Edge mill 6...Rough shaped steel billet 7...Conventional example Horizontal roll of universal rolling mill 8...Conventional example Vertical roll 9 of the universal rolling mill according to the present invention...Horizontal rolls 9a, 9b of the universal rolling mill according to the present invention...Each opposing surface 10 of the horizontal roll 9.
...Vertical roll of the Niversal rolling mill according to the present invention

Claims (1)

[Claims] The roll diameter is maximum at the center of the roll body length and minimum at both roll ends, and the angle with the vertical plane changes at least once from the center of the roll body length to both roll ends, and after this change A vertical roll having a roll outer peripheral surface in which the angle of A universal rolling mill characterized by comprising horizontal rolls.