The process of vibration signal transmission caused by self-excited vibration between hob and workpiece in the machining process of machine tool is analyzed. Generally, there are as many vibration modes as there are parts in a gear hobbing machine tool, and there are as many resonance frequencies. The vibration modes of the first few steps, that is, the low-frequency resonance modes, usually have a great impact on the machine tool, while the high-frequency tool chatter has a great impact on the surface quality of the machined parts; Through the above formula analysis, it can be seen that as long as the vibration frequency of the gear hobbing machine tool avoids the frequency of the first few vibration modes in the machining process and reduces the amplitude of the input excitation as much as possible, the machine tool can enter the normal machining state, such as adjusting the gear hobbing process parameters and changing the excitation frequency; Reduce the workpiece cutting feed, use high hardness alloy tools, increase the number of cutting edges, and reduce the input excitation amplitude.
Through the analysis, we know that as long as the gear hobbing machine tool does not have the first few vibration modes and the high-frequency chatter of the tool in the processing process, the gear hobbing machine tool will be in the normal working state, and for the gear hobbing machine tool, as long as the machine tool is designed, manufactured and installed, its dynamic characteristics have been determined, Even if the quality of some parts is changed, it has little effect on the overall dynamic characteristics. (except for the tool part) in this case, we can use the experimental method to monitor the processing state of the machine tool in real time, that is, to monitor the processing state of the gear hobbing machine tool, so that the machine tool can work in the normal working state in real time, and improve the production efficiency and production accuracy; Next, the monitoring system is designed to verify the correctness of the above theory affecting the gear machining accuracy.