Tribological Characteristics of Dual-Pressure Tube Hydroforming

Abstract:

Dual-pressure tube hydroforming (THF) is a tube hydroforming process variant whereby deformation of the tubular specimen is achieved by exerting fluid pressure on both the inside and outside surfaces of the tube. Dual-pressure THF experiments are conducted to study tribological conditions when producing pear-shaped and triangular parts. The pressure-loading paths are designed to exert pressure in oscillatory pattern: I.e., the pressure on the inside was alternated with pressure on the outside causing the tube to expand and contract/buckle as deformation progressed. During tube contraction, the metal-to-metal contact area is substantially reduced. This leads to reduction in friction stress at the tube-die interface, thus increasing formability. Comparing the geometries of the formed parts produced by dual-pressure THF and conventional THF reveals that the former results in a substantial increase in the protrusion height of a pear-shaped specimen.

• Periodical: Defect and Diffusion Forum (Volume 414)
• Pages: 111-116
• DOI: https://doi.org/10.4028/p-m3bo3q
• Online since: February 2022
• Authors: Gracious Ngaile*, Mauricio Avila
• Keywords: Formability, Loading Path, Lubrication, Tube Hydroforming

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