Granted Patent B2

US 12,576,438 · App. 17/434,260 · Granted Mar 17, 2026

Inventor: Cristian Valsecchi (Mandello del Lario, IT)

Assignee: BLM S.p.A.

B21D3/14B21D41/02B23B27/045B23D21/006B23D21/04B26D3/166B23B27/08

Abstract

Claims (23)

1 . An apparatus for orbital cutting and calibration of tubes, the apparatus comprising

a rotor having a central hole through which a tube to be cut is movable along its longitudinal axis, the rotor being drivable to rotate about a first axis of rotation (x 1 ) coinciding in use with the longitudinal axis of the tube that is supplied to the apparatus;

a cutting device comprising a first support body mounted radially movable on the rotor, and a cutting tool carried by said first support body; and

a calibration device comprising a second support body mounted radially movable on the rotor, and a calibration tool carried by said second support body,

wherein the calibration tool is movable in a radial direction (outwards to produce an enlargement of an inner diameter of a piece of the tube,

wherein said first support body and second support body are separate from one another and are mounted on the rotor so as to be movable along a same radial direction, and

wherein the apparatus further comprises a single driving device paired both to said first support body and to said second support body to drive a movement of said first and second support bodies along said radial direction (y) in a symmetrical manner with respect to said first axis of rotation (x 1 ).

2 . The apparatus of claim 1 , wherein the cutting tool is formed by a roller mounted on said first support body so as to be idly rotatable about a second axis of rotation (x 2 ) parallel to said first axis of rotation (x 1 ) and has a circumferential cutting edge.

3 . The apparatus of claim 1 , wherein the calibration tool is configured to widen said piece of the tube by plastic deformation.

4 . The apparatus of claim 1 , wherein the calibration tool is provided with a cutting edge shaped to widen said piece of the tube by chip removal.

5 . A machine for straightening and cutting tubes from a coil, comprising an apparatus for orbital cutting and calibration of tubes, the apparatus comprising

a rotor having a central hole through which a tube to be cut is movable along its longitudinal axis, the rotor being drivable to rotate about a first axis of rotation (x 1 ) coinciding in use with the longitudinal axis of the tube that is supplied to the apparatus;

a cutting device comprising a first support body mounted radially movable on the rotor, and a cutting tool carried by said first support body; and

a calibration device comprising a second support body mounted radially movable on the rotor, and a calibration tool carried by said second support body,

wherein the calibration tool is movable in a radial direction outwards to produce an enlargement of an inner diameter of a piece of the tube,

wherein said first support body and second support body are separate from one another and are mounted on the rotor so as to be movable along a same radial direction, and

wherein the apparatus further comprises a single driving device paired both to said first support body and to said second support body to drive a movement of said first and second support bodies along said radial direction (y) in a symmetrical manner with respect to said first axis of rotation (x 1 ).

6 . The machine of claim 5 , said machine being configured to perform the following steps:

with the rotor in rotation, cutting the piece from the tube by the cutting tool;

displacing the piece axially to move the piece away from a remaining part of the tube;

displacing the calibration tool radially towards the longitudinal axis of the tube until the calibration tool reaches a predetermined position within radial dimensions of the tube;

displacing the piece axially towards the calibration tool; and

with the rotor in rotation, moving the calibration tool radially outwards to produce the enlargement of the inner diameter of the piece of the tube.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (9)