Research For Key Technology Of Virbration-detecting And Wireless Transmitting Tool Holder In Milling Process

With the cutting direction towards high efficiency and precision, intelligent monitoring technology has become very important in the development of manufacturing industry. As one of the basic parameters of cutting tool condition, vibration, to a certain extent, be able to accurately reflect the state of a cutting tool. Thus, timely monitoring of vibration can predict cutting state of cutting tool. Currently, the monitoring means cutting vibration are mostly monitored by an external sensor, which sensors are usually mounted on the workpiece, the table or spindle housing. This monitoring method repeatability and portability is poor, and can not effectively eliminate the influence of positional caused by displacement, or due to far from the cutting point, the monitored vibration signal is weak, so it is difficult to meet the demand for highly automated machining.For the current situation, this paper presents a novel intelligent monitoring system that the vibration sensor and signal acquisition circuitry are integrated on the milling shank. the Specific research programs are as follows:Firstly, the principle of vibration for milling system is analysised, and we propose two milling vibration model, that vibration caused by the displacement feedback and vibration caused by the velocity feedback as well. The former is due to damp in the process of cutting sometimes positive, sometimes negative; the latter is due to the stiffness of the system sometimes positive, sometimes negative.Secondly, the overall structure of the wireless vibration measurement system is designed. Since milling handle is always in rotation state in milling, a vibration sensor, signal acquisition systems and wireless transmission systems need to be integrated into the handle. We should ensure the vibration sensor can be effectively collect vibration signal in the process of cutting. Structural change does not affect the normal cutting.Again, for the wireless vibration handle design requirements, signal acquisition systems and wireless transmission systems are designed. Among them, we apply embedded systems to complete the acquisition of vibration signals, employ WIFI model to achieve the transmission of vibration signals, and assume Labview software to compile PC interface. PC can remotely control lower machine to turn on signal acquisition and wireless transmission, is capable of timely displaying and analyzing vibration signals, and monitor vibration cutting state accurately.Finally, for the design of wireless vibration handle system, we take machine test. We verify the vibration transmission characteristics and analyze the impact of the machine noise vibration signal, sensor mounting position and cutting parameters.