Sheet material, method of producing same and rolls for use in th

Details Sheet material, method of producing same and rolls for use in th Sheet material, method of producing same and rolls for use in th

1995-05-15

1997-11-25

Larson, Lowell A.

Metal deforming

By use of 'flying tool' engaging moving work

Including orbitally-moving tool-face

723792, 52630, B21D 4900

Patent

active

056899904

DESCRIPTION:

BRIEF SUMMARY
From one aspect, the present invention relates to sheet material of the kind, hereinafter called the kind specified, having on both of its faces a plurality of rows of projections, each projection having been formed by deforming the sheet material locally to leave a corresponding depression at the opposite face of the material. Sheet material of the kind specified is stiffer than the plain sheet material from which it is formed and the mass of material required for a particular duty can be reduced by using sheet material of the kind specified in place of plain sheet material.
An example of sheet material of the kind specified is disclosed in CH-486,281. In this example, there extend in a first direction rows of alternating projections and depressions and straight lines can be drawn on a surface of the material between adjacent ones of these rows. The projections and depressions also form rows which extend in a second direction perpendicular to the first direction and between which further straight lines can be drawn on the surface of the material. Along these straight lines, the overall thickness of the material is substantially equal to the thickness of the plain sheet material from which the material of the kind specified is formed and the material can bend along these lines considerably more easily than it can bend along a centreline of one of the rows. Also in the material disclosed in this published specification, the overall thickness of the sheet material of the kind specified is approximately twelve times the thickness at a point where the thickness has a maximum value, and which thickness we call herein the gauge of the material.
An alternative construction material is disclosed in GB 2011313A of Van Leer. It is disclosed that this construction element may be manufactured from concrete, steel plate, or synthetic resin and that the manufacturing process may include folding and cutting or deep-drawing. The construction element has rows of projections at each of its faces and also has rows of apertures between the rows of projections. The overall thickness of the construction element is many times the gauge of the material of which it is formed
As used herein, the term "sheet material" embraces generally flat material as described in the aforesaid Swiss patent specification and products made by bending generally flat sheet material, examples of which products are mentioned in our published International patent application no. PCT/GB81/00095.
According to a first aspect of the invention, we provide sheet material of the kind specified wherein the relative positions of the projections and depressions are such that lines drawn on a surface of the material between adjacent rows of projections and depressions are not rectilinear.
The overall thickness of sheet material in accordance with the invention as viewed in any cross-section in a plane which is generally perpendicular to the sheet material is substantially greater than the gauge of the material; in contra-distinction to the sheet material disclosed in CH-486,281, where the overall thickness of the material in certain planes which are generally perpendicular to the sheet material is substantially equal to the gauge. In all such cross sections, sheet material in accordance with the invention is undulatory and there is no place where the material can be cut along a straight line and the resulting cross section of the material will be rectilinear.
The overall thickness of sheet material embodying the invention is determined by the heights of the projections at both faces of the material. The height of projections which is sufficient to ensure that lines drawn on a surface of the material between adjacent rows of projections and depressions are not rectilinear depends upon the pitch of the projections and depressions in the rows. We have found that an overall thickness of twice the gauge of the sheet material is generally a suitable thickness and sufficient to avoid rectilinear lines on the surface of the material. Preferably, the overall thickness is n

REFERENCES:
patent: 2441476 (1948-05-01), Ewald
patent: 2481046 (1949-09-01), Scurlock
patent: 2878553 (1959-03-01), Hirsch
patent: 3992162 (1976-11-01), Gewiss
patent: 4343866 (1982-08-01), Oser

Affiliated with

Also associated with

Rating

Sheet material, method of producing same and rolls for use in th does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sheet material, method of producing same and rolls for use in th, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sheet material, method of producing same and rolls for use in th will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2098313