Sheet-metal formed with spaced projections and manufacturing method of the same
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United States of America Patent
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-
Mar 23, 2004
Grant Date -
Sep 27, 2001
app pub date -
Mar 23, 2001
filing date -
Mar 23, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sheet metal formed thereon with a number of spaced projections, wherein the projections are formed by the steps of positioning the sheet metal between a female die formed with a number of spaced recesses at one surface thereof and a male die formed with a concavity to be coupled with the female die and a number of spaced projections located at the bottom of the concavity to correspond with the recesses of the female die and pressing the sheet metal under existence of hydraulic fluid between the sheet metal and the concavity of the male die.
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