Method for manufacturing motor vehicle door hinge
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United States of America Patent
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Nov 25, 2014
Issued Date -
N/A
app pub date -
Sep 14, 2012
filing date -
Mar 24, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A method for manufacturing a high-strength motor vehicle door hinge from a steel plate blank includes a cold heading step of forming a cylindrical bulging portion at one end of the blank in the width direction, a shaft hole forming step of forming a shaft hole in the cylindrical bulging portion, and a shaft hole finishing step. In the shaft hole forming step, a shaft hole is formed using a first punch having a top end with a shape of a cone and a first die having an inner wall with a gap volume relative to the outer circumferential surface of the cylindrical bulging portion of the blank.
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