JPS6043201B2 - universal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a universal rolling mill for rolling section steel such as H section steel.

Generally, after the first rough rolling of H-beam steel using a double rolling mill,
The product is finished into specified product dimensions through a second rough rolling mill group consisting of a universal mill and an edger mill (double rolling mill) and a finishing mill group consisting of a universal mill or a universal mill and an edger mill.

The universal mill generally includes a pair of upper and lower horizontal rolls that are rotatably driven from a motor shaft through a pinion stand and a universal spindle, and a pair of left and right non-driven vertical rolls that are arranged coaxially with the horizontal rolls. There is.

The diameter ratio of the horizontal roll and the vertical roll is usually 1:0.
When an H-section steel is rolled by horizontal rolls and vertical rolls having a diameter ratio of about 1, the flange part of the H-section steel is first rolled down by the vertical rolls, and the rolling reduction is 50% or more.
After 60% progress, rolling down of the web section by horizontal rolls will begin.

Therefore, due to the difference in the biting length between the horizontal rolls and the vertical rolls, rolling flaws occur in the H-section steel and dimensional accuracy is reduced. In order to solve such problems in shape rolling of H-beam steel, there is a universal rolling mill described in, for example, Japanese Patent Publication No. 47-49415.

j This consists of a vertical roll moving frame that spans both sides of the rolling mill frame and is orthogonal to the rolling line, and is movable in the entry and exit directions of the rolling mill. A pair of vertical roll chock is provided,
By moving the vertical rolls in the inlet and exit directions of the rolling mill, the point at which the horizontal rolls start biting the section steel web section and the point at which the vertical rolls start biting the section steel flange section can be adjusted to be the same. This is what I did. By the way, to provide a vertical roll moving frame movably between both sides of the rolling mill frame and orthogonal to the rolling line, the rolling mill frame (rolling mill housing) must be made larger9). When the moving frame is moved, the vertical roll moving frame must be installed so as not to interfere with the upper and lower horizontal rolls, so there are drawbacks such as difficulty in installing the vertical roll moving frame.

The present invention is intended to solve the problem of the lack of means for moving the vertical rolls in the conventional universal rolling mill. An example of the implementation of the present invention will be explained below based on FIGS. 1 and 2.

Note that FIG. 1 shows a half-cut plane of only the left vertical roll portion of the universal rolling mill, and the right vertical roll portion is omitted.

1 and 2, 1 is a housing, 2 is a vertical roll, 3 is a chock of the vertical roll 2, 4 is a shaft rotatably supporting the vertical roll 2, and has flanges 4a on the top and bottom. have.

5 is a bearing between the vertical roll 2 and the shaft 4.

Each liner 6 is attached to the chock 3,
The chock 3 is located on the entrance side of the rolling mill in the housing 1.
Although it is capable of sliding in a direction perpendicular to the exit side, it is fixed on the entrance and exit sides of the rolling mill. The front and rear ends of the upper and lower flanges 4a on the shaft 4! Wedge 4b with symmetrical surface
The wedge 4b of each flange 4a
A slide plate 7 having a wedge 7a surface in contact with the wedge 4b surface of the flange 4a is slidably provided between the surface and the inner surface of the front and rear projecting edges 3a at the top and bottom of the chock 3. There is.

Each of the slide plates 7 is held by a plate holder 8 fixed to the flange 4a of the shaft 4, and protrudes from a piston 9a in a fluid pressure cylinder 9 installed at the front and rear of the chock 3, respectively. They are adapted to be slid in the left and right directions via pins 9b located on the sides.

For example, vertical rono L/. 2 from the neutral position in FIGS. 1 and 2 by +S forward (toward the entrance of the rolling mill), operate the piston 9a in the front fluid pressure cylinder 9 to the left, The front upper and lower slide plates 7 are slid to the left, thereby creating a gap between the wedge 7a surface of the front upper and lower slide plates 7 and the wedge 4b surface of the front end of the upper and lower flanges 4a. At the same time, in the rear fluid pressure cylinder 9.
It is sufficient to slide the piston 9a to the right to slide the rear upper and lower slide plates 7 to the right, thereby moving the upper and lower flanges 4a forward by +S.

In addition, when moving the vertical roll 2 from the neutral position shown in FIGS. 1 and 2 backward by -S (toward the exit side of the rolling mill), the front and rear hydraulic cylinders 9 are operated in the opposite direction. Just let it happen.

Note that the fluid pressure cylinder 9, as shown in FIG.
The hydraulic cylinders 9 are installed in the upper and lower front portions and the upper and lower rear portions, respectively, and the upper and lower hydraulic cylinders 9 are operated synchronously.

Since the universal rolling mill of the present invention, especially the means for moving the vertical rolls, has the above-described configuration, only the roll chock 3 of each vertical roll 2 in an existing universal rolling mill needs to be modified, so there is no need to enlarge the rolling mill housing. There is no risk of interference with the upper and lower horizontal rolls, and it can be modified relatively easily and inexpensively.

[Brief explanation of the drawing]

The figures show an example of the implementation of the present invention, in which Fig. 1 is a half-cut plan view of the left vertical roll part of a universal rolling mill, and Fig. 2 is a sectional view taken along the line A-A in Fig. 1. be.

Claims (1)

[Claims] 1. In a universal rolling mill having a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls arranged coaxially with the horizontal rolls, on the front and rear end surfaces of the upper and lower flanges 4a of the support shaft 4 of the vertical roll 2, A symmetrical wedge 4b is formed, and the wedge 4b of each flange 4a is
The wedge 4 of the flange 4a is between
Slide plates 7 each having a wedge 7a surface in contact with the b surface are slidably provided, and each slide plate 7 is made to protrude from a piston 9a in a fluid pressure cylinder 9 disposed inside the front and rear portions of the chock 3, respectively. The pair of left and right vertical rolls 2 are slidable in the direction perpendicular to the rolling line through the respective slide plates 7 and the upper and lower flanges 4a, respectively, in the entry and exit directions of the rolling mill. A universal rolling mill characterized by being movable.