Patent ID: 7827839
Filing Date: 2010-11-09
Classification: B21D,Y10T

Abstract:
1. A method of hydraulic bulging a profile element pipe comprising: providing a profile element pipe having a peripheral length with an outer diameter gradually increasing or decreasing from one axial side toward the other thereof; reshaping at least one end part of the profile element pipe to form parallel part being parallel to a longitudinal axis of the profile element pipe; and hydraulically bulging the profile element pipe by pressurizing an interior of the profile element pipe and reshaping of the profile element pipe and applying an axial force to the end of the parallel part using a tool adapted to engage the parallel part for metal flow and reshaping to form a bulged pipe, the engagement of the tool with the parallel part sealing an interior of the profile element pipe, and wherein the tool engages the parallel part for a first length for sealing, and the tool moves a second length during application of the axial force, the parallel part of the profile element pipe having a length greater than the sum of the first and second lengths.