METHOD OF FORMING CONES OF SHEET MATERIALS Russian patent published in 1994 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of using a female die with a conicity angle of its forming surfaces, equal to mean angle of conicity angles of several cones, had been made in this female die; placing a sheet blank in the female die along a small curvature radius of the forming surface while taking into account a springiness, corresponding to a small radius of the cone to be made; placing the blank together with the female die on a plate of a press till crossing an axis of a punch with a center of the blank pressure onto the forming surface of the female die; determining the center of pressure by a center of gravity of pressure trapezium, having bases, equal to length values of upon contact of upper and lower edges of the blank and the forming surface of the female die with lateral sides, whose inclination angles relative to an axis of the trapezium are equal to the conicity angle of the forming surface of the die; bending the blank by successive of the punch along generatrix of the cone. EFFECT: enhanced quality of cones. 1 cl, 3 dwg