Study on fracture behavior of metal round bar under dual frequency vibration loading

There are some problems such as low utilization rate, high energy consumption, low productivity and poor quality of cutting surface in the traditional metal bar cutting technology. Aimed at this situation, this paper analyzes that the low-frequency load causes the crack initiation at the tip of the v-groove of the bar, the high-frequency load causes the crack propagation at the tip of the V type groove of the bar, and give the criteria for the initiation of the ν type groove at the tip of the bar. a new precision dual frequency vibration cutting technology is adopted, and a dual frequency excitation device is proposed. On this basis, this paper carries out a dynamic analysis of the experimental device, which can fully guarantee the separation of metal bar in theory. Single frequency and dual frequency load experiments were carried out on 7A09 aviation aluminum, the experimental results show that the dual frequency vibration can improve the quality of the section and shorten the fracture time. Therefore, It gives support to the cutting technology for metal round bar under the dual frequency vibration load both in theory and the experiment.