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Note added at 19 мин (2016-04-07 17:01:13 GMT)
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Method for straightening and for relieving stresses in workpieces
US 2985956 A

An elongated workpiece is fed axially and intermittently in small increments through an annular set of hammers or forging dies with the workpiece being held at its trailing and leading ends in axial alinement with the throat of the dies. These impart, in off-beat relation to the feeding of the workpiece, a series of sharp, rapidly delivered hammer blows which reduce the increments to a plastic condition and thus relieve them of longitudinal stresses.
http://www.google.com/patents/US2985956

Thus, the workpiece is moved forward in small increments and comes to rest between increments of feed and when in rest the workpieceis held immovable against reactions caused thereon by the forming strokes, which by means (Fig. 4) later to be described is properly timed in relation to the feeding strokes so as to create the off-beat relationship that will later be described more in detail, it being understood that this term is simply a convenient expression for describing a forming and feeding relation wherein the workpiece is fed incrementally in short intermittent strokes and comes to rest between feed strokes and while at rest is formed in forming strokes which are spaced apart by the feeding strokes so that alternate feeding v and rest-forming strokes take place.
http://www.google.com/patents/US2894421