Metal deforming – By use of roller or roller-like tool-element – Included in roller-cluster
Reexamination Certificate
1999-12-14
2001-11-27
Larson, Lowell A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
Included in roller-cluster
C072S226000
Reexamination Certificate
active
06321583
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a multifunction rolling mill for rolling an H-beam capable of conducting both edging-rolling and universal-rolling with a single rolling mill. Also, the present invention relates to a rolling method of rolling an H-beam with the multifunction rolling mill.
DESCRIPTION OF THE PRIOR ART
Concerning an apparatus for rolling an H-beam, for example, rolling apparatus B for rolling an H-beam is disclosed in Japanese Unexamined Patent Publication No. 56-109101. The arrangement of the rolling apparatus disclosed in the above patent publication is briefly shown in
FIGS. 19 and 20
. As shown in the drawings, rolling apparatus B for rolling an H-beam includes a breakdown rolling mill
70
, a universal rough rolling mill
71
, an edger rolling mill
72
and a universal finish rolling mill
73
which are arranged in series.
According to the rolling method of rolling an H-beam with the above rolling apparatus B, rolling is conducted as follows. First, a piece of work to be rolled
87
such as a slab or a beam blank is roughly rolled into a predetermined configuration with the breakdown rolling mill
70
as shown in
FIGS. 19 and 20
. After that, intermediate rolling is conducted by a plurality of passes with the universal rough rolling mill
71
and the edger rolling mill
72
. Then, the piece of work to be finally rolled is rolled into an H-beam
86
, which is a final product, with the universal finish rolling mill
73
. Specifically, the rolling method is described as follows. As shown in
FIG. 20
, the piece of work
87
to be rolled is roughly rolled with the breakdown rollers
74
,
75
of the breakdown rolling mill
70
. Then, the web and flange of the H-beam are rolled with the horizontal rollers
76
,
77
and the vertical rollers
78
,
79
of the universal rough rolling mill
71
. Then, reduction is given to both edge portions of the flange of the H-beam by the edger rollers
80
,
81
, so that the flange width can determined. In the universal finish rolling mill
73
, the web and flange are rolled with the horizontal rollers
82
,
93
and the vertical rollers
84
,
85
, whereby the flange is formed so that the flange angle can be kept at 90° with respect to the web.
However, the following problems to be solved may be encountered in the above rolling apparatus B for rolling the H-beam.
As shown in
FIG. 19
, it is necessary to provide the universal rough rolling mill
71
and the universal finish rolling mill
73
for rolling the web and flange in the process after the breakdown rolling mill
70
. In order to give reduction to the edge portions of the flange, it is necessary to provide the edger rolling mill
72
. Therefore, the equipment cost is raised and, further, the length of the rolling line is extended.
On the other hand, Japanese Unexamined Patent Publication No. 4-251603 discloses a universal rolling mill in which rollers for reducing the flange width are arranged on both sides of the upper and the lower horizontal roller. In this rolling mill, the following three reduction processes are simultaneously conducted.
(1) Reduction of the web of the H-beam conducted by the outer circumferential face of the horizontal roller
(2) Reduction of the external faces of the flanges of the H-beam conducted between the vertical rollers arranged on both sides of the horizontal rollers
(3) Reduction of the flange width of the H-beam conducted by the width reduction rollers arranged on both sides of the horizontal rollers
Since the above three processes are simultaneously conducted, it is necessary to arrange a pair of flange width reduction rollers in a gap formed by a pair of right and left vertical rollers and a pair of upper and lower horizontal rollers. However, this gap is so small that it is difficult to ensure the thickness of the disk-shaped flange width reduction rollers. Accordingly, it is impossible to ensure the mechanical strength of the rollers. For the above reasons, it is difficult to put the above universal rolling mill into practical use.
On the other hand, from the viewpoint of product quality, the above universal rolling mill has the following disadvantages. Since it is difficult to make the gap between the vertical rollers and the horizontal rollers agree with the thickness of the flange width reduction rollers, when the flange width reduction rollers are thick, the rollers interfere with each other, and it is impossible to reduce the thickness of the flange of the H-beam to a predetermined value. On the contrary, when the flange width reduction rollers are thin, it is impossible to apply reduction to the overall face of the flange end of the H-beam. Accordingly, recesses are formed on the end faces of the flanges of the H-beam, which deteriorate the product quality.
Further, the universal rolling mill described in Japanese Unexamined Patent Publication No. 4-251603 is disadvantageous in that the number of the rolling mills can not be decreased and the length of the rolling line can not be shortened, that is, the equipment cost can not be decreased. In other words, it is impossible to accomplish the object of the present invention by the universal rolling mill described in Japanese Unexamined Patent Publication No. 4-251603 .
It is an object of the present invention to provide a multifunction rolling mill for rolling an H-beam, the dimensional accuracy of which is high, and also provide a rolling method of rolling an H-beam with the multifunction rolling mill when the number of the rolling mills, which is at least three for conducting intermediate and finish rolling by the prior art, is decreased to two so that the equipment cost can be reduced and at the same time the length of the line can be shortened so as to reduce the length of the building in which the rolling apparatus is installed.
SUMMARY OF THE INVENTION
The present invention described in claim
1
provides a multifunction rolling mill for rolling an H-beam comprising: a pair of right and left vertical rollers composed of flange thickness reduction rollers; and a pair of upper and lower horizontal rollers having web thickness reduction rolling section and flange width reduction rolling section which are capable of freely moving in the vertical direction and arranged via a retracting mechanism arranged at both ends of the web thickness reduction rollers, wherein the flange width reduction rolling section of the horizontal rollers is moved in the vertical direction when the flange thickness reduction and the web thickness reduction are conducted by the vertical roller and the horizontal rollers so that the flange width reduction rolling section of the horizontal rollers cannot interfere with the vertical rollers.
The present invention described in claim
2
provides a multifunction rolling mill for rolling an H-beam according to claim
1
, wherein both reduction faces of the flange width reduction rolling section are formed into annular tapered faces, the diameters of which are gradually symmetrically decreased toward the centers of the flange thickness reduction rollers.
In the multifunction rolling mill for rolling an H-beam described in claims
1
and
2
, not only the web thickness reducing rolling section for reducing the web of the H-beam and the flange thickness reducing rollers for reducing the external side face of the flanges of the H-beam but also the flange width reducing rolling section for reducing the flange edge section of the H-beam is integrally incorporated into the rolling mill, and the flange width reducing rolling section can be moved between the reducing position and the retracting position by the retracting mechanism.
Accordingly, the number of the rolling mills, which is at least three in the rolling apparatus of the prior art, can be decreased to two. As a result, the length of the building can be decreased and also the length of the foundation can be decreased, that is, the equipment cost of the rolling apparatus for rolling the H-beam can be lowered.
It is possible to adopt a rolling pass schedule in which universal rough r
Haji Takashi
Ikezaki Toru
Mizutani Hideo
Suzuki Takashi
Kenyon & Kenyon
Larson Lowell A.
Nippon Steel Corporation
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