With the continuous development of CNC machine tool technology,

 CNC machine tools have also made great progress in high precision, high speed, high stability and high efficiency. However, in the process of machining, the tool and the workpiece in the uninterrupted movement, the vibration of the machine tool is inevitable. However, through reasonable measures, the phenomenon of vibrating knife can be avoided because of vibration phenomenon. The following Kunshan Duyang CNC to share with you the CNC machine tool machining process vibrating tool reasons and put forward the corresponding treatment measures. First, the cause of CNC machine tool vibration problems 1. The machine tool resonates during processing Resonance is a common physical phenomenon. When the frequency of periodic driving force is the same as the frequency of self-generated self-excited vibration, the resonance phenomenon will occur. The resonance phenomenon will cause the vibration amplitude to increase, which will have a great impact on the machining quality of the machine tool. The amplitude caused by resonance is too large, which will lead to changes in the running track of the tool and the workpiece, causing position deviation, which will reduce the quality and dimensional accuracy of the machined surface, increase the surface roughness of the workpiece, and appear vibration marks. 2. Machine tool guide parts "crawling" phenomenon Machine tool crawling is when the running parts of the machine tool have low-speed movement or a small amount of displacement, do non-uniform movement, and the phenomenon of fast and slow when the feed and adjustment movement appear. Crawling is caused by changes in friction resistance. In the operation of the machine tool, a certain value of the speed region of the operation, that is, the critical value of the speed, will produce a crawl. At this time, the surface of the workpiece will produce tremors, resulting in vibration. 3. Poor workpiece rigidity In the machining process, for the outer circle turning of the slender shaft, the workpiece will bend and deform during the rotation process, resulting in swing, which will lead to problems such as cutting and vibrating tools. At the same time, when the outer circle of thin-walled parts is turned, it is easy to have clamping deformation, and it is also easy to have the problem of cutting or vibrating tool. In the process of turning irregular parts, the driving force is often not acting on the center of gravity of the workpiece, and under high-speed cutting conditions, it will cause the deformation of the spindle, resulting in the occurrence of machine vibration and vibration tool phenomenon. 4. Poor tool installation rigidity For example, the size of the tool bar is too small or extended too long, which will cause the tool bar to flutter. When the lathe tool pad iron is not flat, or the lock nut is not pressed, it will also lead to the vibration of the tool. 5. The cutting force changes greatly During the cutting process, there are some problems such as inclusion and coarse grain in the cutting layer metal. Or when the machining surface is irregular, the cutting is wide when it is narrow when it is thick when it is thin, etc., which will cause the vibration of the machine tool and the vibrating tool phenomenon because of the change in the cutting force. Second, numerical control machine tool generated vibration tool problem solution 1. Measures to eliminate machine resonance The static stiffness and dynamic stiffness of CNC machine tools depend on the design and manufacturing process of the machine tool manufacturer, and the natural frequency of an installed machine tool is fixed. In order to prevent the resonance problem in the machine tool processing as far as possible, the cutting parameters of the machining system must be reasonably arranged during the machining process, so that it can effectively avoid the natural frequency of the system without resonance. In addition, the purpose of suppressing the resonance of the machine tool can be achieved by using some non-standard tools. For example, the unequal milling cutter and unequal distance milling cutter used in the CNC milling process. 2. Measures to solve the "crawling" phenomenon Regular inspection and maintenance of the guide rail, and provide a good lubrication environment to protect the moving surface of the guide rail; The guide rail needs to be repaired or replaced in time after wear to ensure the operation of the machine tool; During the machining process, the tool programming track adopts smooth transition to avoid the rapid acceleration and deceleration of the guide rail and low speed operation. 3. Measures to solve the insufficient rigidity of workpiece and tool In the process of machining, it is necessary to use the auxiliary devices such as center press, center frame and tool holder to improve the rigidity of the slender shaft parts. For thin-walled parts, special working clamps should be used to prevent bending and deformation. When the tool meets the requirements of use, the extension length should be as short as possible; The lathe tool pad iron should be flat, the less the number, the better, and the pad iron should be aligned with the tool holder, and the tool position must be cleaned; At the beginning of processing, test cutting should be carried out to adjust the cutting speed, cutting depth and feed amount. 4. Solve the problem of tool bar flutter during tool installation. Select the appropriate tool bar size and shorten the extension of the tool bar, adjust the process, such as cutting feed speed and spindle speed. And check carefully whether to lock the nut. 5. Measures to solve the change of cutting force It is necessary to use cubic boron nitride blade for processing, and the cutting speed and feed rate are slower at the beginning of the processing, and then faster after the round. For the workpiece with a defective surface, the amount of back cutting should be as large as possible at the beginning, and then it can be reduced appropriately.