Metal deforming – By pulling workpiece through closed periphery die – Producing a non-uniform product
Patent
1983-03-02
1984-10-16
Crane, Daniel C.
Metal deforming
By pulling workpiece through closed periphery die
Producing a non-uniform product
72367, 291573A, B21C 100, B21D 5306
Patent
active
044767048
ABSTRACT:
A finned tube for a heat exchanger has an inner surface in which is provided raised portions which are in rows and extend in the longitudinal direction of the tube. The raised portions are arranged, within each row, at irregular intervals and each raised portion may either increase or decrease toward a radially inward tip. The raised portions may have a cross-section which is substantially triangular or trapezoidal or in the shape of a parallelogram and the lateral surfaces of the raised portions, together with the internal surfaces of the tube are roughened during drawing.
In a process of making such a tube, an unhardened tube having a plurality of circumferentially disposed longitudinally extending fins is drawn through a die so as to subject the tube to a cross-sectional decrease of at least 50% to thereby fragment the fins to provide gaps between remaining raised portions of the fins.
A drawing die for used in the process has an entry angle .alpha..gtoreq. 40.degree..
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Hage Manfred
Schinkoth Gerhard
Crane Daniel C.
Wieland-Werke AG
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