12
Sep
The original power rolls were generally of the Pyramid Type. The old plate bending operators did however come up with ways to deal with this problem and some of them are described in the ‘The Recent History of Design and Selection of Plate Bending Machines’ (Part 1).
12
Sep
The curving of wrought iron plate by passing a plate through a set of rollers probably dates back to the late 18th Century when Henry Cort, an English iron master rolled barrel hoops in the 1780's. The early machines would be small and could be directly hand driven or by a geared handle to give some mechanical advantage.
07
Aug
The crystals or ‘grains’ of which iron and steel are composed are built up of exceedingly small cubes built up of atoms. The length of each side of a cube is less than a tenth of a millionth of an inch, too small to be seen under even the most powerful microscope, but what can be seen are irregularly shaped crystal or crystal-grain, and each is built up of a huge number of cubical units.
19
Sep
Before steel came into general use during the latter part of the 19th century, curved structures were frequently constructed from iron, which is cast in liquid form in a curved profile or built up from wrought iron components, either with shaped web plates or in the form of lattice trusses. Because wrought iron was very soft, blacksmiths could curve small components by hot forging.
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