METHOD FOR DRAWING ROUND CROSS-SECTION BLANKS Russian patent published in 2005 - IPC

FIELD: manufacture of semi-finished round cross-section products by drawing.

SUBSTANCE: method comprises steps of drawing blank through row of drawing dies arranged successively and simultaneously rotating one or several drawing dies; selecting relation of revolution number of drawing dies and translation motion speed of blank according to condition of heating blank to preset temperature; rotating next drawing die before deforming blank in non-rotating drawing die after which pulling effort is applied or before applying pulling effort; then drawing blank through non-rotating drawing die. Preset temperature value corresponds to temperature of hot or warm drawing of blank. Temperature may exceed recrystallization temperature of drawn material or it may correspond to temperature of heating drawn material for quenching or to aging temperature of drawn material. After heating for quenching material may be subjected to chilling by supplying cooling agent or by drawing through cooled drawing die.

EFFECT: possibility for combining operations of heat treatment and deformation of metal, enlarged manufacturing possibilities of drawing process.

9 cl, 4 dwg, 6 ex