Abstract: In order to investigate the effects of the main processing parameters on the forming situation of the tooth depth, and provide foundation of the corresponding parameter optimi- zation and process design, the forming process and the process characteristics of the cup-shaped thin-walled inner rectangular gear formed by spinning are analyzed based on the MSC.MARC finite element analysis (FEA) software. Combin- ing with the processing experiment, the deformation mechanism of the deformed metal flow along the axial, radial and tangential directions are obtained; the effects of the processing parameters on the forming situation of the tooth depth are studied quantita-tively; the typical defects occurred during spinning are analyzed and the effective prevention methods are put forward. The main indexes to evaluate quality of the inner gear formed by spinning are presented, including the rear tooth dimension uniformity in the tangent and axial directions. Both the simulation and ex- periment results show that: During the spinning of the cup-shaped thin-walled inner rectangular gear, the effect of the blank radius reduction on the tooth depth is significant; The effect of the roller feed rate is slight. When adopting unreason- able processing parameters, the forming defects, such as the piling, fracture, stagger and uneven depth of the gear teeth along the circumferential direction, tearing of the gullet, may occur.

Key words: chamber, earth pressure balance shield machine, model predictive control, multi-system coordination control, Inner gear, Numerical simulation, Processing parameter, Spinning