Metal deforming – By relatively movable offset tool-faces – Plural
Patent
1974-08-16
1976-08-31
Lanham, C.W.
Metal deforming
By relatively movable offset tool-faces
Plural
72344, 72427, B21D 1702
Patent
active
039772284
ABSTRACT:
An apparatus for forming pipe from sheet metal, comprises a preforming die having laterally spaced substantially parallel walls and an interior surface spaced inwardly from an edge of the wall and located between the walls in which are mounted a pair of transversely spaced curved segments shaped to receive the outside surface of the sheet when it is formed into a pipe. Piston and cylinder combinations carry each segment so that they may be moved outwardly or inwardly for regulating the degree of bending of the sheet therebetween. A drawing punch includes a curved forming punch surface with a holding down element at each end which are constructed so as to be movable into and out of the space between the parallel walls. The apparatus also includes a finishing tool which comprises a receiving die shaped to the outer diameter of the pipe to be formed. The finishing tool also includes a punch mounted on a piston rod for inward and outward movement which operates in conjunction with a two-part mandrel having two half portions which may be swung either inwardly or outwardly on pivots in order to vary the diameter of the engagement surface of the mandrel which is moved by the punch into forming engagement with the sheet. The two half portions of the mandrel are fixed to a cross-bar which carries the piston rod which carries the punch. During formation of the final pipe bends, the portions which have not been operated upon in the preforming are bent inwardly and are closed to form the round pipe formation.
REFERENCES:
patent: 445238 (1891-01-01), Beach
patent: 1875954 (1932-09-01), Taylor
patent: 2162731 (1939-06-01), Lyon
patent: 2419563 (1947-04-01), Kaser
patent: 2649128 (1953-08-01), Schoellerman
patent: 2939349 (1960-06-01), Smith
patent: 3429172 (1969-02-01), Lierse et al.
Duzan James R.
Lanham C.W.
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