JPH04172115A - Variable device for vertical roll shaft center of universal rolling mill - Google Patents

Abstract

PURPOSE:To obtain the shape with high quality by providing a pair of pressing devices for moving the vertical roll in both rolling directions at the clearance of the inner surface of vertical roll chock and the outer surface of vertical roll shaft, further providing the adjusting liner for the shaft center variable amount which is changeable and receives the rolling reaction at the above clearance. CONSTITUTION:Because an end surface of the vertical roll shaft 3 is pressed always to a vertical roll chock 5 through a shaft center variable amount adjusting liner 8 along the rolling direction, it is steady enough against the shock for the time to bite the material to be rolled with high speed and large weight, and the shaft center position of the vertical roll is not changed. The shaft center movement of the vertical roll is that the shaft center variable amount can be adjusted with the shaft center variable amount adjusting liner directly by the hydraulic cylinder 6, so the variation of the shaft center with instant and exact amount can be done against the change of rolling direction. The device is compact, so easily included in the existing universal mill. Because there is no sliding part at the transmitting part of the thrust force required for movement, the biting of scale, etc., is no produced, thereby the stable movement of the shaft center can be realized. Therefore, the shape with the accuracy of dimension and high quality can be manufactured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a section steel having a flange such as an H section steel, for example,
(2) This relates to a device that allows the axis of a vertical roll of a universal rolling mill for rolling shaped steel, channel steel, etc. to move freely in the rolling direction.

[Prior art] When rolling a section steel with flanges such as H-beam steel and I-beam steel, ■ The elongation of the flange and web per bus (thickness before rolling/thickness after rolling) must be rolled within a certain range. If not, it is known that longitudinal waves will occur in the web, and to prevent this, it is possible to reduce the rolling web waves by moving the axis of the vertical roll in the rolling direction. Such a device is disclosed in Japanese Unexamined Patent Publication No. 57-97807.

[Problems to be Solved by the Invention] The device disclosed in Japanese Patent Application Laid-open No. 57-97807 forms a symmetrical wedge on the flange of the supporting shaft of a vertical roll, and creates sliding motion between the wedge and the chock. Note: The slide plate is slid via a pin protruding from the piston by a hydraulic cylinder built into the chock, and the axis of the vertical roll is moved in the rolling direction via the slide plate and flange. Although it is intended to be moved, there are problems as shown below.

■The reaction force that the vertical roll receives during rolling is transmitted to the vertical roll, flange wedge, slide plate, pin, hydraulic cylinder, and chock, but the rigidity is low because it is received by the hydraulic cylinder in the middle. The shaft center position changes due to shock between the teeth of a high-speed, heavy rolling mill, which adversely affects product dimensional accuracy.

■The wedge end face of the flange and the end face of the slide plate slide due to surface contact when the axis of the vertical roll moves.
During operation, scale etc. gets caught in this surface contact area, causing malfunction in the axis movement of the vertical roll.

[Means for Solving the Problems] In order to solve the problem B mentioned above, the vertical roll axis variable device of the universal rolling mill of the present invention includes a pair of upper and lower horizontal rolls and a vertical roll axis that is perpendicular to the axis of the horizontal rolls. In the vertical roll axis variable device of a universal rolling mill, which has a pair of left and right vertical rolls arranged on the axis of rolling, the vertical roll can be moved in both rolling directions into the gap between the inner surface of the vertical roll chock and the outer surface of the vertical roll axis. The present invention is characterized in that at least one pair of pressing devices is provided, and a replaceable axial center variable amount adjustment liner that receives rolling reaction force is provided in the gap.

[Function] ■The end face of the vertical roll shaft is constantly pressed against the vertical roll chock along the rolling direction via the shaft center variable adjustment liner, so it is sufficient to withstand the shock between the holes of high-speed and heavy rolled material. It is solid and the axial center position of the vertical roll does not fluctuate.

■Since the axis movement of the vertical roll can be adjusted directly using a hydraulic cylinder and the axis variable amount can be adjusted using the axis variable amount adjustment liner, it is possible to quickly and accurately change the axis center according to changes in the rolling direction.

■By incorporating the vertical roll axis variable device into the vertical roll chock, the device is compact and can be easily integrated into existing universal mills.

■Since the axis of the vertical roll is moved directly by a hydraulic cylinder, there is no sliding part in the transmission part of the thrust necessary for movement, so the axis can be moved stably at all times without getting caught in scale etc. Possible.

[Example] An example of the present invention having these features will be described below with reference to drawings F.

FIG. 1 is a plan view of a vertical roll chock of a universal mill incorporating the vertical roll axis variable device of the present invention, and FIG.
The figure shows the AA sectional view. The figure shows a place where the axis of the D+u+ vertical roll is eccentric in the rolling direction with respect to the horizontal roll axis 1. In the figure, 5 is a vertical roll choke, 2 is a vertical roll, 3 is a vertical roll shaft, and 6 is a hydraulic cylinder for varying the shaft center. The mechanism of adjusting the shaft center using these devices will be explained with reference to FIG.

The vertical roll 2 is rotatably assembled to a vertical roll shaft 3 via a rolling bearing 4, and the vertical roll shaft 3 is loaded on a vertical roll chock 5.

As shown in Fig. 2, the relationship between the vertical roll shaft 3 and the vertical roll chock 5 is such that it can move in the rolling direction and has a small amount of rearrangement in the vertical direction on four sliding surfaces 7a, 7b, 7c, and 7d. It is maintained by providing The variable shaft center is controlled by a hydraulic cylinder 6a for variable shaft center shown in FIG.
, 6b. That is, in FIG. 4, the vertical roll assembly 2.3.4 is pressed in the direction of the arrow in the figure by the variable axis hydraulic cylinder 68. At this time, the shaft center variable hydraulic cylinder 6b has been retracted to the stroke end.

The vertical roll assembly 2.3.4 includes a shaft center variable amount adjustment liner 8a (not shown in FIG. 5) on the end face of the vertical roll shaft;
It is pressed to the vertical roll chuck B"/ri5 via 8b, 8c, and 8d. This is an extremely important point.

Since it is pressed along the rolling direction, it can withstand shocks between the holes of high-speed, heavy rolled material with sufficient firmness. Therefore, even when the rolling direction is reversed, it is pressed along the rolling direction accordingly. In addition, since this mechanism minimizes the amount of movement required to change the axis, the capacity of the hydraulic cylinder for adjusting the axis is kept to the minimum required, making it possible to make the vertical roll axis variable device more compact. It's now possible. As a result, it can be integrated into existing universal mills.

Further, the adjustment of the variable amount of the shaft center is possible by exchanging the center variable amount adjusting liners 8a, 8b, 8c, and 8d shown in FIG. 4 off-line. At present, it is sufficient to adjust the shaft center variable amount in response to changes in rolling size. However, if the need arises in the future to adjust the amount of shaft center variation for each rolling pass, it will be possible to meet this need by controlling the position of the shaft center variable hydraulic cylinder. In addition, the movement of the shaft center variable is directly performed by a hydraulic cylinder, and the amount of shaft center change is determined by a liner, and since it is only necessary to press it against the liner, it has become possible to shorten the variable time.

Next, a mechanism for following the variable axis of the vertical roll guide will be explained with reference to FIG.

Vertical roll guides 9a, 9b are provided at the front and back of the vertical roll 2 in the rolling direction, respectively, or a vertical roll stripper kite 10.
Built-in. As shown in the figure, the vertical roll guides 9a and 9b rotate about the axis II, and are constantly pressed against the vertical roll 2 via the spring 12. For this reason, the vertical roll 2a that occurs when the vertical roll moves in the rolling direction with a variable axis
The gap between the vertical roll guides 9a and 9b is automatically filled. If there is a gap, the rolled material will hit and cause big trouble. For this reason, the mechanism of this guide is also an important point.

In this example, a hydraulic cylinder for variable shaft center was used as a pressing device for moving the vertical roll in the meat rolling direction, and the installation positions were set at four cylinder locations in both rolling directions and at the upper part of the vertical roll choke. However, there are only two places in the meat rolling direction at the top of the vertical roll chock, or two places in the meat rolling direction at the bottom of the vertical roll chock.
They may be provided only at certain locations, and the vertical rolls can be moved.

In addition, in this embodiment, the exchangeable axial center variable amount adjustment liner may be placed on both sides of the pressing device or only on one side. In this case, the installation position of the pressing device is C as shown in Fig. 1.
- The variable axis M adjustment liner may be installed at a position on line C-C by shifting it to the left or right from line C.

[Effects of the Invention] The effects obtained by the apparatus of the present invention described above are as follows.

(2) It is possible to quickly and accurately move the shaft center in response to changes in the rolling direction, and the shaft center position does not change in response to fluctuations in rolling reaction force, so it has a solid structure.

■The device is compact and can be easily integrated into existing universal mills.

■Even if scale etc. gets stuck in the shaft moving part, stable shaft movement is possible at all times.

This makes it possible to accurately, quickly and firmly move the axis of the vertical rolls for the required stretching of the shaped steel, making it possible to manufacture high-quality shaped steel with good dimensional tolerances.

[Brief explanation of drawings]

FIG. 1 shows a plan view of a vertical roll chock of a universal mill incorporating the vertical roll axis variable device of the present invention. FIG. 2 shows a sectional view taken along line AA in FIG. FIG. 3 shows a BB sectional view of the vjz diagram. FIG. 4 is a sectional view taken along the line CC in FIG. 1, and shows an example in which a hydraulic cylinder for varying the axis of a vertical roll is provided. FIG. 5 shows a sectional view taken along the line DD in FIG. 1, showing an example in which a liner for changing the axial center position of a vertical roll is provided.

Claims (1)

[Claims] 1. In a vertical roll axis variable device for a universal rolling mill that has a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls arranged on axes perpendicular to the axis of the horizontal rolls, the inner surface of the vertical roll chock and the vertical roll At least a pair of pressing devices capable of moving the vertical roll in both rolling directions are provided in the gap between the roll shaft and the outer surface of the roll shaft, and an exchangeable axial center variable amount adjustment liner that receives rolling reaction force is further provided in the gap. Vertical roll axis variable device for universal rolling mills.