# Research on High-Speed Vibration and Structure Optimization of Multiwire Sawing Machine
## 4 Conclusions  
Although the maximum operating speed of the original machine tool is 1800 m/min, in practice, due to the impact of machine vibration on the quality of slicing, the site is often used at a line speed of 1200 m/min for slicing, and occasionally, a line speed of 1500 m/min is used for some materials that require a lower surface quality. Based on the comparison of the above values, it can be concluded that the machine can be optimized to run a high line speed of 2400 m/min for material sawing. In terms of results, the optimized machine line speed increased by 60%, and the quality increased by 31%. An increase in quality means an increase in production cost, while an increase in line speed means an increase in production efficiency and higher economic efficiency at the same time. Therefore, for both comprehensive considerations, the conversion ratio of this optimization reaches 1.94, with a certain quality cost in exchange for a greater increase in sawing efficiency has some significance, which can guide the development of high-line speed multi-wire sawing machines. 1. This article first analyzes the vibration principle of a multi-wire sawing machine, exploring the relationship between dynamic stiffness, amplitude, and excitation force. The conclusion is drawn that, under the condition of constant excitation force, improving the dynamic stiffness of the machine tool can effectively reduce the amplitude. In this paper, the transient dynamic finite element simulation calculation of a multi-wire sawing machine is carried out, and the relative error is less than 11.46%, which was compared with the measured data. This can be used to accurately describe the amplitude variation rule with linear velocity and verify the effectiveness and accuracy of the simulation, which is significant in the study of the vibration characteristics of a multi-wire sawing machine under different linear velocities. 2. To solve the problem of the large amplitude of a multi-wire sawing machine running at a high wire speed, the structure was optimized using a multi-objective optimization design method based on the response surface, and the optimized results were then validated through dynamic analysis. The final effect was remarkable, and the linear speed was improved by about 60% after optimization. This optimization successfully meets the high-speed cutting requirements of the multi-wire sawing machine. 3. Modal analysis was performed on the multi-wire cutting machine to obtain the natural frequencies from the 1 st to the 6 th order. The reasons for the vibration generated at high line speeds were analyzed. According to the sensitivity screening of the machine, size that has a large influence on the vibration of the machine, and the influence relationship between each parameter variable and the optimization objective is obtained by constructing the response surface. The optimization objectives were set to improve the first natural frequency and reduce the displacement of the frame. Then, research on the vibration control strategy of the machine tool can be carried out accordingly. 4. The structure design of a multi-wire sawing machine is summarized: an increase in the diameter of the groove wheel can reduce the motor speed, thus reducing the vibration frequency, reducing the amplitude of each part of the machine tool, reducing the risk of resonance, improving the operation stability of the machine tool, reducing the center of gravity of machine tool, and making its lower end more stable to improve the running stability of the machine tool. Regarding the optimization of the frame structure, the number of ribs, its size, and its position influence its performance. **Author Contributions:** Conceptualization, A.L. and L.C. ; methodology, L.C. and Z.D. ; software, B.H. and A.L. ; validation, L.C., Z.D. and B.H. ; formal analysis, A.L. ; investigation, A.L. and L.C. ; resources, S.W. ; data curation, Z.D. ; writing--original draft preparation, Z.D. and L.C. ; writing--review and editing, S.W. ; visualization, B.H. and A.L.