Method and apparatus for cold-working annular workpieces

Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work

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72 62, B21D 2210

Patent

active

043642519

ABSTRACT:
Disclosed is a method and apparatus for cold-working annular workpieces by applying thereto an internal fluid pressure to cause an enlargement of the diameter thereof through plastic deformation, in which the openings at opposite ends of an annular workpiece are closed by a pair of presser plates through packings which are radially expansible along with the annular workpiece. The contacting surface pressure of the packings and presser plates are controlled to a predetermined value by an arithmetic unit operating on detected values of a main pressure acting internally on the annular workpiece, an auxiliary pressure pressingly holding the presser plates against the respective packings and varitions in the shape of the annular workpiece undergoing the plastic deformation.

REFERENCES:
patent: 2902962 (1959-09-01), Garvin
patent: 3611768 (1971-10-01), Odakai
patent: 3707864 (1973-01-01), Pigott et al.
patent: 3974675 (1976-08-01), Tominaga
patent: 4016737 (1977-04-01), Gustofsson et al.
patent: 4292828 (1981-10-01), Germann

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