Metal deforming – By deflecting successively-presented portions of work during... – By use of deflector arranged to bend work transversely of...
Patent
1989-02-13
1991-01-22
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflector arranged to bend work transversely of...
B21D 514
Patent
active
049861050
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a machine for corrugating sheet metal or the like, comprising a plurality of successive working stations each provided with upper and lower rotatable corrugating devices adapted to jointly provide corrugations of successively increasing depth in a metal sheet which is successively advanced through the machine from a front station toward a rear station.
BACKGROUND OF THE INVENTION
The corrugating devices of prior art machines of this type consist of corrugating rollers in the form of rotatable shafts on which rings are mounted or formed having a cross-sectional shape corresponding to the desired profile to be imparted to the sheet at the station comprising the two corrugating devices at issue. More particularly, the rings of the first or front working station are fairly thin to give shallow corrugations in a first working pass, whereupon the radial thickness of the corrugations is increased successively at subsequent stations in order to give, at a last station, the desired final corrugation depth. In actual practice, however, the use of such ring-carrying shafts as corrugating devices suffers from a number of shortcomings. Since the rings are fixedly mounted on their associated shafts, the peripheral speed at the circumferential or ridge surface of the ring will be different from the peripheral speed of the neighbouring furrows forming portions of the shaft proper, which have a smaller diameter than the ring. This means that the sheet which is being worked will constantly partially slip when in contact with the respective surfaces, and this may lead to inadequate precision and surface damage in the finished product. Furthermore, readjustment of the various corrugating devices of the machine from one corrugation type to another is extremely complicated and time-consuming. For example, readjustment of a prior art machine comprising about 20 working stations may take from 25 to 35 days' work, and this means that small and medium-sized manufacturers are subjected to extensive and costly interruptions when shifting from one corrugation type to another. To large-scale manufacturers with many corrugation types on their production program, such long interruptions are unacceptable, and they are therefore compelled to acquire a separate corrugating machine for each individual corrugation type on their program. This in turn implies extremely high capital costs, and even then long interruptions cannot be avoided if the machine cannot be operated to capacity over a longer period of time.
BRIEF DESCRIPTION OF THE INVENTION
The present invention aims at providing a corrugating machine which does not suffer from the above-mentioned shortcomings and which, in particular, produces corrugated metal sheets with good precision. This is achieved, according to the principal feature of the invention, in that the rollers are individually rotatable as well as thin or disk-shaped and adapted to cooperate in pairs, such that a pair of adjacent rollers in the upper corrugating device determine the shape or width of a lower flange of the sheet at issue, simultaneously as a pair of adjacent rollers in the lower corrugating device determine the shape or width of an upper flange of said sheet.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the drawings, FIG. 1 is a partially cut assembly view of a corrugating machine according to the invention;
FIG. 2 is an enlarged front view of an individual working station comprised by said machine;
FIG. 3 is a partially cut side view on line III--III in FIG. 2;
FIGS. 4-6 are respectively side, top plan and front views of an individual corrugating roller comprised by the said station; and
FIGS. 7 and 8 are schematic front views illustrating the working of a metal sheet in two different successive passes.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
In FIG. 1, a framework according to the invention, generally designated 1, carries a multiplicity of successively aligned working stations 2, 2', 3, 3', 4, 4
REFERENCES:
patent: 1941484 (1934-01-01), Nasmith
patent: 2163063 (1937-08-01), Romanoff
patent: 2643591 (1953-06-01), Overland et al.
patent: 2649888 (1954-04-01), Fay
patent: 2811989 (1957-11-01), Henderson et al.
patent: 3059685 (1962-10-01), Behlen
patent: 3251211 (1963-04-01), Harris
Aktiebolaget Br. Hoglunds Maskinuthyrning
Crane Daniel C.
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