In view of the forming defects of inner wall wrinkling and outer wall tensile cracks during bending process of thin-walled tubes, internal expansion push bending forming technology was proposed. The forming specification was 1Cr18Ni9Ti thin-walled tube of φ30 mm× 0. 3 mm. The thin-wall tubes＇ bending forming properties and wall thickness distribution under different internal expansion pressures were researched by finite element simulation. The results of experiments show that the new technology could resolve the forming defects of inner wall wrinkling and outer wall ten- sile cracks well. It has a great significance to production practice.
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