초록 ▼

This invention relates to sheet metal buildings of relatively large size and more particularly but not exclusively to processes and apparatus for cold-forming elongate building elements of such buildings and methods of building construction. The invention provides in one aspect cold-forming dies 30,

This invention relates to sheet metal buildings of relatively large size and more particularly but not exclusively to processes and apparatus for cold-forming elongate building elements of such buildings and methods of building construction. The invention provides in one aspect cold-forming dies 30, mounted on intermediate transverse members 21 of a frame 1, comprising a set of coextensive generally in register dies between which the strip is received. The set comprises a male die 22 having a concave leading edge 24 and a female die 23 having a convex leading edge 18. The male die 22 and female die 23 are driven towards one another to plastically deform the strip 6 into a channel section. The concave leading edge 24 is provided with a coextensive protrusion 26 and the convex leading edge is provided with a coextensive recess 27. At the same time that the dies 22, 23 mate to plastically deform the strip 6 into a channel section the protrusion 26 and recess 27 of the respective dies 22, 23 mate to form a transverse rib 28 in the strip 6.

대표청구항 ▼

[ What is claimed is:] [1.]1. Apparatus for forming an elongate longitudinally arcuate building element of channel cross-section having transverse ribs from sheet metal comprising a set of coextensive generally in register dies through which a sheet of metal can be received, said set comprising a ma

[ What is claimed is:] [1.]1. Apparatus for forming an elongate longitudinally arcuate building element of channel cross-section having transverse ribs from sheet metal comprising a set of coextensive generally in register dies through which a sheet of metal can be received, said set comprising a male die and a female die which cooperate to form transverse ribs in the sheet wherein further one of said male die and female die is provided with a concave leading edge and the other die is provided with a convex leading edge thereby the dies cooperate to plastically deform the sheet into a channel section, the dies being provided with orbital motions which cooperate to bring the dies into engagement with the sheet, draw the sheet along a transit path therebetween while cold-forming the sheet and then disengage the sheet with each sweep about their orbits.