1 Copyright © 2007 by ASME
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In the present study, a basic comparison between the cold
formability of a commercially"pure Titanium (CP Ti) sheet in
the single"point incremental forming (SPIF) and stamping
processes is presented. An attempt was made to evaluate the
SPIF formability by employing two tests. In the first test, parts
having continuously varying wall angles were formed. While in
the second test, parts having fixed wall angles were formed.
The stamping formability was determined by conducting the
limiting dome height (LDH) test. It is concluded that the
forming limit curve (FLC) in SPIF is located much higher than
the stamping FLC, even higher than the fracture limit curve in
stamping. Moreover, the SPIF formability shows dependence
on the test employed.
?, 8*$> Incremental forming, Conventional forming,
Cold formability, Titanium sheet"metal
- ’#%*$%’#>
The titanium metal is paid much attention for its properties
of lightness, anti"rust and high specific strength. Because of
these properties, titanium has been a potential material for
structural components and attracts much attention from the
aeronautical, chemical, electrical and electronics industries. In
addition, the metal, due to its good adaptability for the living
body, is used to many manufacture medical products.
Applications continue to expand although aerospace usage
remains the largest.
Though several conventional sheet"metal forming
processes, such as power spinning, press forming, rubber pad
forming, stretch forming and roll forming, can be employed to
form the titanium sheet metal components [1], the sheet
formability in these processes is limited. Thus, thermal
activation is required to improve the sheet formability in these
processes, especially stamping as shown in [2]. Even if the
formability can be improved at the elevated temperatures, a
manufacturing process at the room temperature is always
desired for the reasons of cost"effectiveness and better
mechanical properties. In order to fulfill these objectives, a
number of forming processes were developed in the last decade
[3"6]. Among these, due to its flexibility, low"cost tooling,
single point incremental forming (SPIF) has attained a great
attention.
The SPIF process is still under development phase. Rapid
prototyping and manufacturing of complex shapes and
customized medical products are some examples of its
industrial applications investigated so far [7"9]. For making it
more useful, further investigations are needed.
Proceedings of the 2007 International Manufacturing Science And Engineering Conference
MSEC2007
October 15-17, 2007, Atlanta, Georgia, USA
MSEC2007-31138
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