Method and apparatus for straightening of elongated workpieces
AssigneeTh. Kieserling & Albrecht
InventorsRalf Fangmeier, Lothar Bracht
Life of this patent
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Abstract
A method of straightening elongated workpieces of circular or other cross section comprises subjecting a portion of the workpiece during its movement in longitudinal direction thereof to rotary bending forces so that successive curvatures of the workpiece in a zone trailing said portion in said direction gradually increase to thereby surpass the yield point of the material of the workpiece and in a zone leading said portion in said direction gradually decrease in such a manner that the decrease of the curvatures and the corresponding decrease of the plasticity of the workpiece occurs slower than the increase thereof, and an apparatus for carrying out the method.
Claims22
A method of straightening elongated workpieces of circular or other cross section and having a longitudinal axis, comprising the steps of moving a workpiece in the direction of said axis;
- and subjecting a portion of the workpiece during its movement in said direction to bending forces rotating about said axis such that successive curvatures produced in an upstream zone of said portion as considered in said direction, increase to thereby surpass the yield point of the material of the workpiece and in a downstream zone of said portion, as considered in said direction, gradually decrease in such a manner that the decrease of the curvatures and the corresponding decrease of the plasticity of the workpiece occurs slower than the increase thereof.
Apparatus for straightening elongated workpieces comprising upstream and downstream means respectively engaging an elongated workpiece movable in axial direction on at least one side at respectively spaced apart upstream and downstream portions and third means cooperating with said upstream and downstream means and engaging a third portion on at least the opposite side intermediate said upstream and downstream portions for imparting to the workpiece bending forces rotating about the axis thereof, said third means being spaced from said upstream means by a distance smaller than from said downstream means for bending the workpiece between said upstream and downstream means beyond the yield point of the material of the workpiece and in such a manner that the increase of successive curvatures imparted to the workpiece and the corresponding change of plasticity occurs between said upstream means and said third means at a faster rate than between said third means and said downstream means.
Apparatus for straightening elongated workpieces comprises a pair of superimposed rolls rotatable about axes including, as seen from above, an acute angle with each other, one of said rolls being a concave roll and the other a convex roll, said rolls defining a gap therebetween and being arranged so that a workpiece passing in longitudinal direction through said gap is rotated about its axis and bent successively in opposite directions to surpass at the point of maximum curvature the yield point of the material and in such a manner that successive curvatures imparted to the workpiece downstream of said point and the corresponding plasticity of the workpiece decrease slower than the increase thereof upstream of said point.
Dependencies are inferred from the claim text.