Modelling and analysis of chatter in the heavy-load multi-DoF plastic forming process

Regenerative chatter is an unstable and detrimental vibration phenomenon stemming from the regenerative excitation of time-delay dynamic systems. Currently, research on regenerative chatter predominantly focuses on machining process, wherein chatter occurs when the process frequency aligns closely with the natural frequency of the tool-holder system. However, in plastic forming process conducted by heavy-load multi-DoF forming machine (MDFM), the process frequency is far smaller than the natural frequency of the tool-holder system. Despite this, chatter still occurs in the actual plastic forming process, challenging the explanatory capacity of existing chatter models developed for machining process.