Abstract: This paper proposes a method of generating the roller path in multi-pass asymmetric spinning process for the hollow part with straight-edge round-corner cross-section. With the principle of volume invariance, the strain distribution of general hollow part with straight-edge round-corner cross-section is analyzed under the premise of plane strain condition in conventional spinning process. The point set for each pass is generated by rationally assigning the deformation of per pass. The non-axisymmetric spinning device with independent rotation between mandrel and wheel is used to process the hollow part with three straight-edge round-corner cross-section, and the thickness distribution and spring-back of the part are measured to verify the feasibility of this method. All of the results provide a new idea for digital non-axisymmetric spinning technology.

Key words: asymmetric spinning, muti-path, parametric toolpath design