Study On The Influence Mechanism Of Vibration On The Damage Of High SPeed Cutting Tools

In the Process of machining, it is often accom Panied with the occurrence of vibration, which severely restricts the cutting efficiency and the machining accuracy of the Parts, reduces the service life of the machine tool, causes the tool breakage and so on. The vibration caused by the machining Process can change the size and direction of the cutting force, so that the stress field of the cutting tool is changed re Peatedly. So it is imPortant to study the mechanism of the vibration of the cutting tool, and the research will Provide a theoretical basis for the design of the anti- breakage tool.Firstly, the 3D geometry model of the solid carbide end mill is established. The natural frequency and vibration mode of the model were obtained by the finite element modal analysis. At the same time, the ex Perimental modal analysis was carried out to obtain the natural frequency of the model by the method of hammering. The results of the analysis are consistent with the results of the two analyses.Secondly, the orthogonal ex Periment scheme of measuring Process system was designed, which was used to collect synchronously the vibration signal and cutting force signal. In the acquisition Process, the signal of the X and Y axis of the tool was collected by the eddy current dis Placement sensor, and the Z axis was collected by Piezoelectric acceleration sensor. Then, the frequency domain integral was used to signal the Z axis signal, which made the data of X, Z and Y three axes become the disPlacement quantity. The acquisition signal Processed by sPectrum analysis com Pared with the natural frequency of the cutting tool which it was confirmed that there is no resonance in the Process. So it can be ignored that the influence of the resonance on the cutting tool. The influence of cutting Parameters on the cutting vibration was obtained by using range analysis method. At the same time, the single factor ex Periment of cutting mode was designed. It was concluded that the cutting vibration of the reverse milling method is higher than the ex Perimental results of the milling machine.Again, in order to ex Plore the mechanism of imPact of vibration on the stress field of the cutting tool, the finite element analysis was carried out. First, the static analysis of the only cutting force was carried out to obtain the stress field of the end milling cutter. Because the finite element software system is unable to load the dis Placement and force at the same time, it would only load the only vibration dis Placement signal into the stress surface in the static analysis, and the reaction force was obtained by Post Processing. Then, the reaction force and cutting force were su PerimPosed, and the distribution of the stress field in the cutting tool was analyzed, which had a certain change comPared with the seParate loading of the cutting force. In order to the com Parison analysis, the vibration data was taken back to the static analysis. The three grouPs of analysis results were com Pared and analyzed. At the same time, the transient dynamic analysis of three load ste Ps were carried out by using the above method. By com Paring the results of these two kinds of analysis, the vibration can be changed to the stress field of the cutting tool, and the stress field of the cutting tool is getting worse. At the same time, under the action of alternating stress, it will lead to the tool breakage.Finally, through the finite element analysis, the direction of the out Put force has a certain effect on the change of the tool stress field. In order to calculate the unit vector of an arbitrary Point on the rake face of the cutting edge line, the mathematical model of cutting tool was built. The tool under the direction of the different vertical stress field were got by multi grouP finite element analysis using the model. The results were the worst of the comParative analysis, which it shows that the vibration make cutting force fliP obtained direction and ti P of uniform vertical knife surface tool stress field. At last, through the above analysis, the mechanism of vibration was revealed in the Process system.