Patent ID: 9610621
Date: 2017-04-04
CPC Classifications: B21B,B21D

Claim:
1. An apparatus for deforming a metal bar having a rectangular section up to obtaining a metal bar having a trapezoidal section or a hexagonal section, the metal bar having a rectangular section comprising a first lateral wall and a second lateral wall which are opposite one another, and a third lateral wall which is connected to the first lateral wall and to the second lateral wall and which defines a thickness of the metal bar, the apparatus comprising: a first rotatable roller which has a first conical wall and is activatable in rotation; a second rotatable roller which has a second conical wall and is activatable in rotation; the first roller and the second roller being arranged with respect to one another such that: the first conical wall and the second conical wall are facing one another; and when the metal bar having a rectangular section crosses a spatial region comprised between the first conical wall and the second conical wall with the relative third lateral wall facing externally, the first roller and the second roller can press respectively against the first lateral wall and the second lateral wall, deforming the metal bar until the metal bar takes on a trapezoidal or hexagonal shape; guide means for deformation which are arranged with respect to the first roller and the second roller such as to abut the third lateral wall of the metal bar and for guiding the deformation of the metal bar in such a way that the metal bar maintains a straight development, wherein the second conical wall of the second roller is conical, and in that the guide means for deformation are mobile in a distancing-nearing direction with respect to the first roller and the second roller, wherein the guide means for deformation comprise: a first lateral abutment wall ( a first upper abutment wall and a first lower abutment wall which are adjacent to the first lateral abutment wall and arranged downstream of the spatial region between the first conical wall and the second conical wall with respect to the advancement direction of the metal bar, the first upper abutment wall and the first lower abutment wall being connected to the first lateral abutment wall so as to form an overall shape having a C-section in order better to guide the deformation of the metal bar at an outlet from the spatial region between the first conical wall and the second conical wall.