Indirect extrusion method of clad material
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United States of America Patent
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Mar 15, 2005
Grant Date -
Apr 10, 2003
app pub date -
Sep 27, 2002
filing date -
Oct 1, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A clad billet 120 has a core material 122 of which outer surface is coated by a coating material 124. A circular front plate 126 is provided at the head of the clad billet 120. The front plate 126 is made of the same material as the coating material 124. As the clad billet 120 is extruded, the front plate 126 first flows out. Accordingly, instead of the core material 122, the front plate 126 forms dead metal. Moreover, since this front plate 126 is made of the same material as the coating material 124, a defective clad such as a three layer clad are not formed. Also, since a billet thrusting face 102a is tapered toward an axis A of a die at an angle of 55-85 degrees, the volume of dead metal itself is reduced, and therefore it is possible to flow out the defective clad, even if it is generated, at an early stage of extrusion.
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