Method and apparatus to deform the cross section of one or more longitudinal sections of an oblong object
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United States of America Patent
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Apr 29, 2014
Grant Date -
Mar 18, 2010
app pub date -
Mar 11, 2008
filing date -
Mar 14, 2007
priority date (Note) -
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Abstract
The invention relates to such a method and apparatus, as well as to the resulting deformed object out of a relatively hard material such as e.g. a metal or plastic wire in which an undeformed section (2) is clamped near its ends (3, 4) and is subsequently upset in a controlled way by an axial pressure force (22) to a predefined shortened and thickened longitudinal section (5), with which simultaneously over substantially the entire contour sheath (19) of this section (2) a counterforce (29) is exerted so that, with the progressive deformation during upsetting, the total volume of the longitudinal section that is deforming, remains substantially constant. In this thickened section (5) a flattened zone (8) can subsequently be applied in order to realise a final shape (10) such as an opening (26). The invention concerns in particular also the use of a deformation line (40) for manufacturing a heddle for weaving looms.
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