초록 ▼

A method for producing press-rolled tubes (3) with a press mandrel (1) and one or more pressure rollers (2), with the tube (3) being arranged between the press mandrel (1) and the pressure rollers (2) and being plastically deformed by means of force loading of the pressure rollers (2). To produce tu

A method for producing press-rolled tubes (3) with a press mandrel (1) and one or more pressure rollers (2), with the tube (3) being arranged between the press mandrel (1) and the pressure rollers (2) and being plastically deformed by means of force loading of the pressure rollers (2). To produce tubes with end wall thickenings, in a first working operation, a first press mandrel (1a) with a tailstock-end shoulder (4) is used. The pressure rollers (2) begin their transforming work at the tailstock-end shoulder (4) and work in the direction of the machine spindle. The half-finished tube (3a) is taken from the first press mandrel (1a), and, in a second working operation, the half-finished tube (3a) is clamped at the end with the wall thickening (5) which has already produced into a lathe chuck (6) (tensioning spindle or similar) mounted in the press-rolling machine, and a second press mandrel (1b), fastened on the tailstock end and having an outer diameter (d.sub.2) which corresponds to the inner diameter of the wall thickening, is pushed into the half-finished tube (3a). Then the pressure rollers (2) form the second wall thickening from the tailstock-end in the direction of the machine-spindle end.

대표청구항 ▼

[ We claim:] [1.] A method for producing press-rolled tubes, comprising:inserting a first press mandrel with a tailstock-end shoulder into a tube, with the tube being arranged between the first press mandrel and one or more pressure rollers;plastically deforming the tube by force loading of the pres

[ We claim:] [1.] A method for producing press-rolled tubes, comprising:inserting a first press mandrel with a tailstock-end shoulder into a tube, with the tube being arranged between the first press mandrel and one or more pressure rollers;plastically deforming the tube by force loading of the pressure rollers beginning at the tailstock-end shoulder and working in a direction of a machine spindle holding the tube to form a half-finished pipe having a wall thickening portion at an end corresponding to the tailstock-end shoulder;taking the half-finished pipe from the first press mandrel and clamping the half-finished pipe at the wall thickening portion;pushing a second press mandrel having an outer diameter (d2) which corresponds to the inner diameter of the wall thickening portion into the half-finished pipe; andplastically deforming the half-finished pipe by force loading of the pressure rollers from a tailstock-end towards the clamped end to form a second wall thickening portion at the tailstock end.