Pinch decompression in radial crimp press machines

摘要

The specification discloses a crimping process for crimping a metal ferrule (19) onto a hose (17) including the steps of applying a radially inwardly directed crimping force to die elements (16) adapted to engage the ferrule (19) and increasing said crimping force to a first level over a first period of time, at least partially removing the crimping force from said die elements after said first period of time, and reapplying the radially directed crimping force to said die elements (16) and increasing said crimping force to a second level over a second period of time, said second crimping force level being equal to, higher or lower than said first level, and at an end of the crimping process, removing the crimping force fully from the die elements (16).

主权项

1. A crimping process for crimping a metal ferrule onto a hose, said crimping process comprising the steps of:
applying an inwardly directed crimping force to die elements adapted to engage said ferrule and increasing said inwardly directed crimping force to a first level over a first period of time, the inwardly directed crimping force comprising a radial force and a tangential force directed tangentially to an outer surface of the ferrule, wherein applying the inwardly directed crimping force results in bulges being formed on the ferrule between the die elements; at least partially removing the inwardly directed crimping force from said die elements after said first period of time to allow the ferrule to relax, wherein at least partially removing the inwardly directed crimping force includes removing the tangential force applied to the ferrule; reapplying the inwardly directed crimping force to said die elements, wherein reapplying the inwardly directed crimping force includes applying the inwardly directed crimping force on outer edges of the bulges on the ferrule and increasing said inwardly directed crimping force to a second level over a second period of time, said second level being equal to, higher or lower than said first level, wherein said increasing of said inwardly directed crimping force is due to the reapplying of the inwardly directed crimping force further including reapplying the tangential force; and at an end of said crimping process, removing said inwardly directed crimping force fully from said die elements.