Criteria for Outward Curling of Tubes

[+] Author and Article Information
K. Kitazawa

Dept. of Mechanical Systems Engineering, Shinshu University, 500 Wakasato, Nagano 380, Japan

J. Eng. Ind 115(4), 466-471 (Nov 01, 1993) (6 pages) doi:10.1115/1.2901791 History: Received September 01, 1990; Revised December 01, 1992; Online April 08, 2008


The criteria for outward curling of circular metal tubes have been investigated experimentally and theoretically. The results are summarized as follows: (1) The critical bending radius, ρc exists. When the bending radius at die inlet ρ is larger than the ρc , the tube end fits well on the die surface. On the other hand, when ρ ≤ ρc , the tube end separates from the die surface and curling occurs. (2) It is found that there is a geometrical similarity law of the ρc . The ρc increases with increasing die angle. Furthermore, it is also clarified that the ρc is independent of the tube materials and lubrication.

Copyright © 1993 by The American Society of Mechanical Engineers
Topics: Lubrication , Metals
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