ELONGATE BILLET STRAIGHTENING METHOD Russian patent published in 1997 - IPC

FIELD: plastic working of materials. SUBSTANCE: method involves positioning billet on supports; applying force to supports in direction opposed to that of initial curvature of billet to provide plastoelastic flexure of billet, with applied force extending along longitudinal axis of billet; determining deviation of actual form of billet from predetermined form and correction value; providing continuous changing of billet form and determining plastic deformation zone parameters characterizing elastic deformation value and using these values during further deformation of billet and determining return springing and value of residual deformation kept upon release of loading from billet; terminating the process upon reaching residual deformation allowing predetermined form of billet to be obtained; continuously measuring motion of billet section having maximum deformation extent and of section of elastically deformed part of billet in the process of straightening; determining K ratio of values of elastic components of motions in these sections of known elastic region of deformation at relatively low loading value; calculating recited motion difference Z, depending on measured motions and K ratio of elastic motions; comparing this value with value required for correction of billet form. EFFECT: increased precision of control, provision for straightening of continuous and hollow elongate billets with following control of process course and quality of straightened outer and/or inner surface. 11 cl, 8 dwg, 3 tbl