METHOD OF STRAIGHTENING ELONGATED PARTS Russian patent published in 1997 - IPC

FIELD: presses for straightening blanks and parts such as hydraulic cylinders, bodies and plungers of deep sucker rod pumps and other precise elongated members in oil, chemical, power machine engineering. SUBSTANCE: method comprises steps of placing part onto supports for elastoplastically bending it at applying effort between said supports; straightening separate portions of part from one of its end along length selected in dependance upon initial non-rectilinearity of part; preliminarily selecting two mutually normal axial planes; in each plane determining initial non-rectilinearity value of straightened part; determining deviation of symmetry axis of surface from rectilinearity for each cross section of part in selected plane; comparing received value with admissible one; when values are the same subjecting part to elastoplastic bending at placing it on supports arranged at both sides of given cross section of part; applying effort to cross section in selected plane until providing after camber determined according to initial non-rectilinearity of straightened surface. EFFECT: enhanced efficiency and accuracy of method. 3 cl, 4 tbl, 1 dwg