Patent ID: 8635898
Filing Date: 2014-01-28
Classification: B21D

Abstract:
1. A spinning method for reducing a diameter of a pipe body, the spinning method comprising: winding a sheet of elastic material into a tubular wound body for fitting in an interior of the pipe body; inserting the tubular wound body into the pipe body interior with the elasticity thereof causing the tubular wound body to press against an interior surface of the pipe body to exert a generally radially outwardly directed force thereagainst; revolving processing rollers and the pipe body relative to each other with the processing rollers engaging an outer surface of the pipe body; and reciprocating the processing rollers axially along the pipe body and shifting the processing rollers in a radially inward direction with the tubular wound body exerting the generally radially outwardly directed force against the pipe body interior surface during the relative revolving of the processing rollers and the pipe body and during the axial reciprocation and radially inward directed shifting of the processing rollers.