Rotational extrusion molding die and slender metal workpiece made with same
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United States of America Patent
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Apr 28, 2020
Grant Date -
May 11, 2017
app pub date -
Nov 9, 2016
filing date -
Nov 11, 2015
priority date (Note) -
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Abstract
A rotational extrusion molding die and a slender metal workpiece made with same are introduced. The rotational extrusion molding die includes a female mold device, a male mold device, and a rotation driving device. The female mold device is symmetric about an axis to define a cavity corresponding in shape to the slender metal workpiece. The male mold device is movable controllably along the axis relative to the female mold device, allowing the metal blank to pass through the cavity and thereby turn into the slender metal workpiece. The rotation driving device drives the female mold device to rotate about the axis relative to the male mold device. The slender metal workpiece thus manufactured has continuous metal flow lines which extend continually along the axis and along an arc defined by the axis, thereby improving the slender metal workpiece in mechanical properties, mechanical strength, and damping capacity.
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