Process Research Of Asymmetrical Dieless Hollow Spinning

Spinning forming is an advanced processing technology, which includes a variety of cold stamping processes and without cutting part continuous forming. So far, the spinning forming process of the rotary body parts of the circular cross section is relatively mature, but the forming process of the special-shaped part is under the research and exploration stage. Profiled dieless hollow spinning process was studied in this study and the shaped eccentric cone was chosen as the research object. Through the combination of theoretical mathematical model and mathematical knowledge, the formula of the roller motion trace of the virtual axis system in the process of spinning is derived. The trajectory is through the control roller movement, making the flange plate tilt, producing virtual axis and then make part generate virtual half cone angle, controlling the distribution of wall thickness. In the meantime, the reliability of the virtual axis spinning trajectory is verified by means of test, and the multiple sets of parameters combination experiments are planned and performed. Effects of spindle incremental angle, roller axial direction feed rate, roller radius, different flange tilt-angle on wall thickness distribution, surface roughness, shape accuracy and strain distribution of the forming parts were analyzed. In addition, spinning forming mechanism was also studied. Meanwhile, based on CAD 3D modeling software CATIA and the finite element software ANSYS/LS-DYNA, the distribution of the equivalent stress, the equivalent effect and the thinning rate were obtained using the LS-PREPOST post-processing analysis.In this paper, the process test and finite element numerical simulation are used to analyze the two kinds of different analysis methods, and how to control the wall thickness distribution of irregular shaped parts by controlling the roller motion trajectory was explored. The research of this paper can provide reference for the research on the dieless spinning forming method and the mechanism of the spinning forming of the special-shaped part, which has higher theoretical significance and application value.