Metal deforming – By use of roller or roller-like tool-element – Plural roller-couples
Patent
1997-11-10
2000-12-19
Hail, III, Joseph J.
Metal deforming
By use of roller or roller-like tool-element
Plural roller-couples
72234, 72226, 72228, B21B 1312
Patent
active
061614122
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with the production of bar stock, especially steel bar stock, and in particular the invention is concerned with the finishing of daughter bars of reduced cross-section formed by slitting a parent bar longitudinally.
It is known to slit a parent bar into two (or more) daughter bars for subsequent finishing treatment in separate finishing lines.
FIG. 1 of the accompanying drawings is a plan view of a prior art twin strand finishing line. The parent bar 1 is moved in the direction of its length, along a path as indicated by the arrow, through the last stand of the intermediate mill. On exiting the last intermediate stand the bar passes through a slitter 2 which slices the parent bar in the direction of its length into two daughter bars 3, 3'. The daughter bars 3', 3 are also referred to as strands. The daughter strands pass along separate finishing lines 5 and 5' which include separate diverging guide tubes 4, 4. Each finishing line also includes a crop shear 6, a side looper 7 and a multi-stand finishing block 8. As shown in FIG. 1, each finishing block comprises three stands arranged in tandem and driven from a common drive motor 9 through a gearbox 10. Each motor 9 is located outside of the corresponding finishing line 5.
Downstream of the finishing blocks 8 the reduced daughter strands are passed through separate converging guide tubes 11, 11' and then continue side-by-side adjacent the original longitudinal path for further treatment. When it is desired to produce strands of larger cross-section than that of the daughter strands, the parent bar may be routed directly along the longitudinal path between the finishing lines, bypassing the finishing blocks. A conveyor, not shown, is provided for this purpose.
The prior art twin strand finishing line shown in FIG. 1, suffers the disadvantage of requiring duplication of the drive for each of the finishing blocks and because the drives are separate it is necessary to be able to adjust the speed of one finishing block relative to the other and to keep the relative speeds constant. An electronic control is usually required. The finishing blocks 8 have to be spaced apart to permit the parent bar to be passed between them when slitting is not required and the angles of divergence and convergence of the guide tubes 4 and 11 are constrained to be small. This means that the overall length of the finishing line, from the slitter to where the daughter strands come together again downstream of the guide tubes 11, is determined by the separation of the finishing lines and the angle of divergence and convergence of the guide tubes.
A reduction in the overall length of the finishing line means that the dimensions of the building which houses the finishing line can be reduced and this results in a saving in constructional costs.
Accordingly the present invention resides in a finishing block for rolling at least two strands of bar simultaneously, said block providing for each of the strands two pairs of rolls arranged in tandem with the rolls of one pair being at right angles to the rolls of the other pair characterised in the provision of a shaft having an input end and an output end with each pair of rolls being in driving relation with the shaft and the input end of the shaft being connectable to a drive motor or to, and in line with, the output end of a corresponding shaft of a similar finishing block.
In one embodiment of the invention, the strands of bar extend along three or four parallel paths spaced from and located around a further path and the axis of the drive shaft is located on the further path. When there are four paths, two of the parallel paths may be at a higher level and two of the parallel paths at a lower level than the further path.
By ensuring that a common drive is employed and particularly by arranging for the common drive to be between the parallel paths along which the strands travel, the overall size of the multi-strand finishing line can be reduced as compared with the prior art. The problem of synchronising the
REFERENCES:
patent: 5307663 (1994-05-01), Shore et al.
Hogg James Trevor
Sakai Akiro
Sato Ryo
Butler Rodney
Hail III Joseph J.
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