Metal deforming – By use of roller or roller-like tool-element – Plural roller-couples
Reexamination Certificate
1999-12-22
2001-03-27
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
Plural roller-couples
C072S234000, C072S226000
Reexamination Certificate
active
06205834
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of rolling finished sections from preliminary sections by means of roll stand arrangements which operate in reversing operation. The roll stand arrangements include a compact rolling group composed of a first universal stand at the entry side and a second universal stand at the exit side and an intermediate edging stand arranged between the universal stands, and a roughing group arranged in front of the compact rolling group and composed of vertical roll stands and horizontal roll stands and/or universal stands.
2. Description of the Related Art
The rolling of sheet piling sections and angle sections and similar sections has in the past generally been carried out in fully continuously operating rolling trains, wherein the large number of shaping grooves necessary in reversing operation for the roughing rolling of such sections required great lengths of the bodies of the rolls for accommodating the number of shaping grooves. These large stands and the rolls themselves, as well as the necessary manipulating devices for introducing the rolling stock into the various grooves are very complicated, require a large amount of space and have relatively low throughput capacities. The large quantities of rolling stock lead to relatively long rolling times during reversing rolling and, therefore, they do not make it possible to operate such plants in a timed sequence with a continuous casting machine. For this reason, relatively large intermediate storage facilities are required when continuous casting plant and rolling mill are used together.
Moreover, in the case of fully continuous rolling particularly of angle steel sections and U-shaped steel sections, six or more roll stands with the appropriate drives are required because of the large number of shaping grooves.
In addition to the disadvantages described above, this leads to high costs for the large number of rolls to be made available and for exchanging and refinishing the rolls. Furthermore, in the case of discontinuous roughing rolling and the also continuous finish rolling, different temperatures over the length of the rolling stock cannot be avoided, wherein the different temperatures occur as so-called temperature wedges between the beginning and the end of the rolling length caused by the relatively low entry speed of the rolling stock into the first stand of the rolling train. These temperature wedges must be compensated or controlled in order to meet the requirements made of the rolling stock, for example, by heat treating plants. It has already been demanded to combine the production of a relatively small number of sheet piles and different angle sections with the production of girders or beams in the plants of the above-described type in which practically only girders were rolled in the past. However, since the production of girders or beams always takes place in a combined operation with a continuous casting plant, i.e., without reversing roughing stands, the combinations with a production of sheet piles and angle sections could only be realized with an extremely large number of additional devices and reassemblies.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to carry out rolling of sheet piling sections and angle sections, as well as other comparable sections, by means of roll stand arrangements having the basic configuration described above, wherein as initial products either continuously cast rectangular blooms are used or preliminary sections are used which are already cast in a preliminary shape which approximates as much as possible the final product. The number of shaping grooves required for all rolling steps should be reduced as much as possible in order to achieve an economical shaping with production times which permit a combined operation of continuous casting machine and rolling mill.
In accordance with the present invention, with one or more of the roll stands of the roughing rolling group and/or one or more of the roll stands of the compact rolling group being equipped with several selectable grooves which can optionally be moved into and out of the rolling line, or with grooves of a roll stand being located next to each other which can become effective for rolling by displacing the rolling stock transversely of the rolling line, a rectangular preliminary section or a preliminary section having the approximate final dimensions is preshaped in the roll stands of the roughing rolling group in a number of shape changing passes and/or shape reduction passes, possibly reversing with or without the use of the selectable grooves. Subsequently, the section is further shaped in the compact rolling group, possibly in a reversing manner, in several shape changing passes or shape reduction passes in the universal stand on the entry side, possibly in the intermediate edging stand with or without the use of the selectable grooves or the grooves of the roll stands located next to each other. Subsequently, the section is shaped into the finished section in the universal stand on the exit side or in the intermediate edging stand, possibly also with the use of the selectable grooves or the grooves of the roll stands located next to each other.
In the method according to the present invention, the roughing rolling group can also operate continuously with or without free runout of the rolling stock between the two roll stand groups or also in a rolling line transversely offset parallel to the rolling line of the compact rolling group.
The roughing rolling group may be composed of one roll stand or of several roll stands. It is possible to use horizontal roll stands, vertical roll stands or universal roll stands as well as other combinations of the types of roll stands. When using universal roll stands, these can also be constructed as combination stands which optionally operate as two-high stands.
When carrying out the method according to the present invention with a roughing rolling group having a universal stand and/or a vertical two-high stand and a horizontal two-high stand and a compact rolling group whose intermediate edging stand includes two or more rolling grooves, the preliminary section reduced by edging in the roughing rolling group can be finish-shaped in a section-reducing manner in a reversing pass in the universal stand on the entry side following a section-changing shaping in the universal stand on the entry side and in the selectable passes of the intermediate edging stand.
However, in accordance with another possibility, using a roughing rolling group including a vertical two-high stand or a universal stand and a horizontal two-high stand and a compact rolling group whose intermediate edging stand includes two or more selectable grooves, the preliminary section is edged in the roughing rolling group, and the preliminary section is shaped in a profile-changing manner in one pass or several reversing passes in the horizontal two-high stand of the roughing rolling group having profiled rolls. In subsequent reversing passes between the universal stand on the entry side and the selectable grooves of the intermediate edging stand, the section is shaped in an essentially section-reducing manner in the universal stand and is shaped in section-changing manner in the selectable grooves and is finish-shaped in an also section-changing manner in the universal stand on the exit side.
When using a roughing rolling group with a vertical two-high stand or a universal stand and a horizontal two-high stand and a compact rolling group with a roll stand each on the entry side and on the exit side each having two two-high roll sets with two or more grooves and with corresponding transverse shifting devices for the rolling stock and an intermediate edging stand with or without selectable grooves arranged between the roll stands, it is possible in accordance with the present invention to proceed in such a way that the preshaped preliminary section or the preliminary section subjected to edging
Engel Georg
Fournie David A.
Nowak Hans-Jurgen
Schmelzle Lloyd M.
Svejkovsky Ulrich
Butler Rodney A.
Kueffner Friedrich
SMS Schloemann--Siemag Aktiengesellschaft
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