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Abstract: TIAD (Tube inversion by the
axial drawing) is an advanced forming process for manufacturing
double-walled tubes with high quality, high efficiency, low consumption.
However, whether to realize forming process depends on whether to
produce the tearing in deforming zone, which has a close relationship
with deforming force. Therefore, it is important to study the influence
of forming condition parameters on the deforming force by FEM numerical
simulation for the realization and the development of TIAD precision
forming process. The results obtained show: (1) During the whole forming
process, the shape of the tube keeps unchanged, so the precision forming
can be easily realized; (2) For a given r/d0 or d0/d0, the deforming
force depends mainly on the value of r/d0, and there is a critical
parameter k, when r/d0<k, the steady forming force decreases with the
increase of r/d0; on the contrary, when r/d0>k, the steady forming force
increases with the increase of r/d0; (3) The material hardening exponent
n of the tube has a remarkable influence on the deforming force. The
smaller the value of n, the larger the forming force. The influence of
friction coefficient on the deforming force is relatively small,
however, good frictional condition will help to improve the surface
quality of the part gained.
Key words: Tube Inversion by the axial drawing Precision forming FEM
Deforming force
CLC No: TG386
国家自然科学基金(59775055)和西北工业大学博士论文创新基金资助项目.
Received 20011114, received in revised form 20020114
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