Metal deforming – By deflecting successively-presented portions of work during... – By use of deflected arranged to provide longitudinally...
Patent
1997-08-06
1999-05-25
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflected arranged to provide longitudinally...
72164, 226183, 226189, B21D 302
Patent
active
059061286
ABSTRACT:
Drawing assembly for bending machines used for metal shapes, in particular round pieces (11) for reinforcement purposes or metallic wire, the drawing assembly comprising at least a drawing device placed upstream of the shears (13) and the bending unit (14) and at least a straightening device placed upstream of the drawing device, the drawing device comprising at least a rotary drum having at its periphery a containing seating (19) for the round piece (11), the round piece (11) winding partly onto the rotary drum (17) and within the containing seating (19), the rotating drum (17) being at least 300 mm in diameter, the drawing device (12) comprising at least two contrasting cylinders (18) of a diameter of not more than 180 mm, placed in a position of reciprocal proximity and cooperating with the periphery of the rotary drum (17), the contrasting cylinders (18) acting against the periphery so as to define the arc of winding of the round piece (11) onto the rotary drum (17), there being immediately upstream of the rotary drum (17) a deflection assembly (16) which causes a loop-shaped deformation (20) of the round piece (11) passing through, the loop (20) having an equivalent diameter of at least 800 mm, and the round piece (11) cooperating, at the outlet area of the rotary drum (17), with a first straightening-stretching roll (24).
REFERENCES:
patent: 2092840 (1937-09-01), Greene
patent: 3196656 (1965-07-01), Johnston
patent: 3834204 (1974-09-01), Ihle
patent: 4876873 (1989-10-01), Del Fabro
patent: 5440804 (1995-08-01), Tamura
Draht, vol. 38, no. 11, November 1987, Bamberg De, pp. 847-849, XP002027039, Liekmeier: kalibrieren von Drahten in Linie mit Produktionsmaschinen. pp 847, right-hand column, paragraph 2 -page 848, left-hand column, paragraph 1, figure 1.
Del Fabro Giorgio
Del Fabro Marcello
Crane Daniel C.
M.E.P. Macchine Elettroniche Piegatricia SpA
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