| 摘要 |
An apparatus (10) for deforming a metal bar (7) up to obtaining a spiral (3), comprising: a guide housing (8) for the metal bar (7), fixed to the frame; a deforming shaft (1); a first rotating member (41) which comprises a first gripping surface (51) of the metal bar (7); a second rotating member (42) which comprises a second gripping surface (52) of the metal bar (7); a fourth abutting surface (34) which projects from the lateral surface of the deforming shaft (1); a fifth abutting surface (35) which is facing the fourth abutting surface (34); a sixth abutting surface (36) which projects from the lateral surface of the deforming shaft (1), which is orientated in an opposite direction to the fourth abutting surface (34), which is distanced from the fourth abutting surface (34) by a distance that is substantially equal to a pitch of the spiral (3) to be obtained by the deformation of the metal bar (7). The apparatus (10) is configured in such a way as to carry out a plurality of operating cycles, each comprising: the gripping of the metal bar (7), actuating the first rotating member (41) and the second rotating member (42) in a first rotation direction (G) up to reaching a second angular position (E2), disengagement of the first rotating member (41) and the second rotating member (42), actuating the first rotating member (41) and the second rotating member (42) in a second rotation direction, opposite the first, up to the first angular position (E1); together with the abutting action exerted by the guide housing (8), the deforming shaft (1), the fourth abutting surface (34), the fifth abutting surface (35) and the sixth abutting surface (36); determining the deformation of the metal bar (7) up to obtaining a spiral (3). |
