Metal deforming – By deflecting successively-presented portions of work during... – By use of deflector arranged to bend work transversely of...
Patent
1987-10-13
1989-10-24
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflector arranged to bend work transversely of...
72178, B21D 1304
Patent
active
048753548
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a machine which is designed for longitudinal corrugating of metal sheeting, in continuous strips or separate sheets for building purposes or similar applications.
Existing machines are known where each forming step has an integrated, specially designed upper and lower roll forming set for combined stepwise forming and propulsion of the sheet material. Each roller is designed with alternating ridges and grooves which correspond to the convex and concave profiles in the sheet material passing through the rollers. Such roll-forming machines are expensive and reguire highly-skilled operators, these machines are also costly and complicated to run as well as maintain, particularly because they require numerous extremely costly roller sets, and a relatively long profiling stretch. Moreover, each profile shape requires a complete set of individually designed forming rollers. Thus any change from one type of profile to another involves the replacement of every set of forming rollers with new ones, meaning that there will be a long changeover time. Furthermore, the roller housing brackets and the drive arrangement have to be specially designed for this purpose which further increases production costs and complicates this type of corrugating machine.
In addition, these forming rollers have limited applications regarding the material characteristics thickness and the type of coating. The sheet material which can be used stipulate certain specific rigid requirements which have to be observed when the forming rollers are adjusted, depending on the material's character and the thickness of the sheet
This means that existing roll-forming mills are limited both in the choice of material and the profile and corrugation patterns. An alternative has been to base production on a relatively high output of each profile, consequently the variety in sheet thickness and sheet qualities are extremely limited.
A Swedish Patent, No. 348, 955 concerns a corrugating machine where each forming step consists of an upper and lower axle arranged in pairs, where at least one of the axles is a drive shaft. Propulsion and corrugating of the sheet is facilitated by means of paired counter-acting rollers. One of the rollers in such a pair is free-running or is connected to a free-running axle. Furthermore, one of the rollers in each pair has a larger diameter than the other, the two rollers being located alternatively on the upper and lower axle. When a sheet is squeezed by the rollers, this will result in the concave profiles, only the flanges or chamfered parts of the sheet are allowed to run freely during the corrugating process. Each pair of rollers has fixed cross-sectional positions. This design places exacting demands upon the diameter of the rollers, and this corrugating machine has no possibilities for adjustment apart from finer adjustments to the thickness of the material. This configuration is consequently very inflexible as it requires the installation of complete sets of new rollers each time the corrugation pattern is changed. There are also a number of other disadvantages with this kind of corrugating machine.
French, Patent No. 867,039 describes a corrugating machine with a number of profiling steps for combined propulsion and preshaping of a sheet into waves. This is done to arrange the sheet materiale and the material distribution before final finishing by a conventional roll forming machine into a trapezoidal or a similar shape. In this machine the individual forming rollers are mounted separately on juxtaposed pairs of axles. The forming rollers have rounded wheel paths to ensure that there is sufficient contact with the sheets to push them forwards. It is assumed that the rollers act independently without any counter-acting rollers. These rollers are designed so that there is no possibility of forming sharp profiles.
The main purpose of the present invention is to make a simple, reliable machine to corrugate metal sheets. Folding or corrugating should be facilitated by a fixed setting for the sheet t
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patent: 4269055 (1981-05-01), Sivachenko et al.
patent: 4549422 (1985-10-01), Harrow
Nilsen Trond
Normann Erling C.
Crane Daniel C.
Pittenger James E.
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