Rolling-mill roll of barrel-width adjustable type

Details Rolling-mill roll of barrel-width adjustable type Rolling-mill roll of barrel-width adjustable type

1996-07-10

1998-09-15

Larson, Lowell A.

Metal deforming

By use of roller or roller-like tool-element

With carrier for roller-couple or tool-couple

29125, 72224, 72238, B21B 1310, B21B 3107, B21B 3118

Patent

active

058063617

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a horizontal roll for rolling shape steels of various sizes, particularly to a rolling-mill roll of which the barrel width is freely adjustable in accordance with a change in the width of the shape steel to be rolled.


BACKGROUND ART

In rolling shape steels having various sizes, a barrel width of a horizontal roll in a universal mill, edging mill or the like must be changed in accordance with the sizes of the shape steel to be rolled. In the prior art, many sets of rolls having different barrel widths corresponding to the sizes of the shape steels to be rolled are adjusted and prepared in advance, and one set of the rolls having a suitable width is selected and changed every time the size of the shape steel is changed. The operation of changing the roll is very time-consuming and increases the production cost.
Recently, to improve the changing operation of the roll, a rolling mill structure wherein the barrel width of a horizontal roll for rolling a shape steel is variable has been put into practice. For example, in rolling of an H-shape steel, a universal mill or an edger mill capable of corresponding to a change of product specification is adopted, or a rolling-mill roll of which a barrel width is adjustable in accordance with the change of the specification is mounted.
For example, Japanese Unexamined Patent Publication No. 62-156007 discloses a rolling-mill roll of a barrel-width adjustable type having a roll section fixed at a position in the axiswise direction and coupled to a drive side, and another roll section movable in the axiswise direction by means of a barrel width adjustable screw. A barrel width corresponding to the width of a rolled shape steel can be set by changing the relative axiswise position of both the roll sections by means of the barrel width adjustment screw.
Such a rolling-mill roll of a barrel-width adjustable type requires a mechanism for transmitting torque from the drive side roll section to the roll for operating the width adjustment. According to one example of such transmission mechanism, a rod portion coaxially projected from the drive side roll section is inserted into the other roll section and fixedly coupled thereto by a spline or key.


DISCLOSURE OF THE INVENTION

According to the above-mentioned roll of a barrel-width adjustable type, the spline or key for coupling the roll sections is located at a position within a rolling width which coincides with the flange width of the H shape steel, and this position is at the side further from bearings of the movable roll section and nearer the rolling region.
Generally speaking, a large bending moment is generated in the roll during the rolling operation due to the rolling reaction, which moment is largest at a center of the rolling width and becomes smaller closer to the axiswise end portion of the roll. Accordingly, in the structure wherein the spline or key is built-in in the rolling region, a stress concentration is liable to occur due to not only the irregular profile thereof but also to the bending load caused by the rolling reaction.
Since there is a problem of stress concentration in the portion of the key or spline in the conventional roll, as described above, it is necessary, for example, to limit the rolling load to below a certain value or to strengthen rolls and other parts with high quality and expensive materials. In this regard, while it is also possible to increasing a roll size to improve the roll strength, this results in the enlargement of a total size of the installation, which is then far from the optimum design.
The present invention provides a rolling-mill roll of a barrel-width adjustable type being more compact in size and free from stress concentration.
Specifically, the barrel-width adjustable type rolling-mill roll is adapted to have an improved mechanical strength by preventing stress concentration from occurring in a coupling structure between a drive side roll and the other side roll. The gist thereof is as follows:
(1) A rolling-mill roll

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