Patent ID: 6079248
Filing Date: 2000-06-27
Classification: B21C

Abstract:
A process for drawing metal bars or tubes from blanks in which a drawing carriage (16) of a drawing machine (10) executes a forward stroke and a return stroke alternately along longitudinal guides (16.1) on a drawing bench (11) between two opposite drawing heads, each of which drawing heads is disposed in one end area (12) and each of said drawing heads includes at least one draw plate,driving said drawing carriage (16) with a reciprocating motion translationally along said longitudinal guides (16.1) between said drawing heads pulling at least one blank to be drawn in each forward stroke and in each return stroke,passing the blank wholly through a corresponding draw plate in the drawing head from which the said carriage (16) is made to move away,such that said carriage (16) executes working strokes in both directions of tranlational movement along the corresponding guides (16.1) at least one blank to be drawn in each working stroke,characterized in that the speed of translational movements of the drawing carriage is continuously regulated by hydraulic means utilizing a variable-delivery pump means providing variable speed patterns during the drawing.