Bulging device and bulging method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 10, 2000
Grant Date -
N/A
app pub date -
Aug 4, 1999
filing date -
Sep 9, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bulging device and a bulging method for bulging a workpiece into an accurate shape, and preventing the generation of cracks therein. High pressure liquid is supplied to the interior space of a workpiece and from an external pressure supply mechanism to the outer space of the workpiece in cavity. An internal pressure detection sensor or an external pressure detection sensor is controlled according to the detected pressure, thereby controlling the pressure of the interior space of the workpiece or the pressure of the outer space of the workpiece in the cavity. Alternatively, position sensors for detecting displacement of pushing dies are provided such that the pressure of the interior space of the workpiece or the pressure of the outer space of the workpiece in the cavity is controlled according to the detected displacement. The workpiece is inserted into the cavity formed by an upper and lower die, and high pressure liquid is supplied to the interior space of the workpiece while an axial compressive force is being applied to the workpiece, thereby bulging the workpiece to follow the contour of the inwardly facing surface of the dies. During this bulging process the pressure of the high pressure liquid period fluctuated.
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