Finite element simulation and microstructure of two-pass inner spinning process of curved-generatrix cone cylindrical parts with annealing/quenching

Abstract

A two-pass annealing/quenching internal spinning process with small-end rotations is proposed to form a curved generatrix conical thin-walled shell. That is, annealing at 360°C for 2 h followed by the 1st pass spinning, and finally quenching in ice water after holding for 1 h at 498 °C followed by the 2nd pass spinning. ABAQUS finite element software is used to simulate the internal spinning process of the products formed under different forming parameters. The distribution laws of spinning force, the stress and strain under different forming processes were compared and analyzed. The mechanical properties and microstructure of the products are subsequently analyzed. The results show that the strain and the residual stress in the skin area of the formed products under two-pass spinning process more uniform, and the hardness and the mechanical performance are improved. The microstructure of the products formed with the 0.15 mm thickness reduction at the 2nd pass is excellent. And the second phase grain size distributed uniformly in the range of 3–6 µm. Whereas, the second phase particles are broken seriously and the size distribution inhomogeneity is increased when the thickness reduction in the skin area is greater than 0.20 mm at the 2nd pass spinning process.

Keywords

curved generatrix conical / internal spinning process / annealing/quenching / small-end rotations / finite element simulation

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