MANUFACTURE OF THICK ANGLE BAR

摘要

PURPOSE:To provider the manufacture of a thick angle bar excellent in orthogonal accuracy and productivity. CONSTITUTION:This method is a manufacture of a thick angle bar 1 having an orthogonal outer apex 101 by rolling a square bar through 2 rolls. It consists of a rhombus processing stage to form the square bar into a rhombic member, an inside flattening stage to form the rhombic member into a square intermediate member having a flat inside surface and an outside surface with a 120-140 deg. outer apex angle, an inside groove processing stage to form the square intermediate member into a groove type intermediate member having a curved and groove type inside surface and an outside surface with a 95-115 deg. outer apex and a finishing stage E to form the outer apex angle of the groove type intermediate member into an orthogonal shape.