Abstract Vibration cropping is a new approach of low-stress manufacturing technique. Vibration cropping machine is a main component of cropping system and directly affects the manufacturing quality. After the working principle of vibration cropping is explained, the analytical, numerical and experimental methods are, respectively, applied to analyze the dynamic characteristics of low-stress vibration cropping machine. Firstly, the motion equation of the cropping machine is derived theoretically based on the kinematics of mechanism, and the mode frequencies and the mode shapes are obtained. In order to assess the computational accuracy, the calculation error is analyzed and the calculation error model is constructed. As a result, the calculation error 2% is confirmed. Secondly, the finite element analysis is used to verify the correctness of the computational result. Analysis shows that the analytical result is in good agreement with the numerical result. Thus, the dynamic characteristics of vibration cropping machine are obtained completely and the reasonable cropping frequency is determined. Experiments prove that the analysis result is correct.
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