Development of the Latest Heat Exchanger Tube Technology
Kimihisa Hiramoto, Shigenari Minami, and Hidekazu Sakihama Showa Denko K.K., Tochigi , Japan
Track: EXTRUSION/DIE, PRACTICAL - Hollow Profiles and Heat Exchanger Profiles
ABSTRACT --- In recent years, aluminum alloy extruded multiple-hollow tubes
used in automotive air-conditioning systems show a tendency to be miniaturized to
satisfy the demands for lighter weight heat exchangers with improved performance,
and the cross-sectional profile of the tubes also tends to become finer. As this trend
continues, it is also necessary to decrease the amount of zinc coating and improve
its uniform distribution in order to meet the demands for increased corrosion
resistance, which is again necessary to reduce the overall weight of these tubes.
With this as background, a new die was developed based on simulation technology
to realize the extrusion of tubes with a fine cross section. A technology to decrease
the amount of adhered zinc and improve its uniform distribution was also developed
to thin the coating on the tube walls. As a result of these developments, an
extrusion technology for lightweight tubes with a fine cross-section was established
and the results are reported.
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