| 摘要 |
An inner metal link bushing is formed by providing flat steel stock having a chamfered edge disposed at an angle relative to the surfaces such that, when the flat stock is reshaped to a tubular formation, the edges forming a longitudinal seam will initially contact one another at the outer surfaces thereof leaving slight gap between such edges in the area adjacent the inner surface. The tubular formation is placed in a die having a rigid interior wall surface in close relationship with the outer surface of the tubular formation and a mandrel is positioned inside the tubular formation in slightly spaced relationship therewith. Presses impose compressive forces on the opposing ends of the tubular formation sufficient to squeeze the ends of the tubular formation toward one another and to cause the inner and outer surfaces of the tubular formation to be homogeneously plastically deformed into firm contact respectively with the inner surface of the partible die and the outer surface of the mandrel. The reshaping caused by such compressive forces also forces the edges into sealing engagement with one another.
|
