According to the calculation result, the carriage has a third-order mode within 1200 Hz. The mode shape of the first-order mode is the wobble around the Y-axis on both sides of the carriage, the mode of the second-order mode is the irregular torsion of the carriage around the Z-axis, and the mode of the third-order mode is the carriage. The undulating vibration around the Y-axis and the partial torsional vibration of the corners of the carriage. Through the finite element modal calculation, the dangerous working frequency of the machine tool carriage is 500-600Hz.
It can be seen from the calculation results that the natural frequency is above 500 Hz. The overall natural frequency of the machine pallet is higher, away from the normal working frequency, and the rigidity of the carriage is better. The screw seat of the carriage must be supported by the screw of the machine drive system and must have a high structural rigidity. Through the above calculation results, it can be found that the relative displacement of the screw seat vibration is small, the vibration is small, and the local stiffness is high, thereby enhancing the transmission rigidity of the entire feed system of the numerical control machine tool and ensuring the accuracy of the transmission system. In addition, it can be seen from the vibration pattern that although the vibration amount on both sides of the carriage is the largest, since the vibration is a symmetrical vibration along the Y-axis, it can ensure that the table on the carriage has only a slight vertical displacement and does not affect. swing. The milling machine is used for machining spur gears. During the machining process, the vibration of the carriage causes the slight vertical direction of the table to not affect the machining accuracy of the gears, and meets the design requirements of the machine pallets.
By comparison, it is found that the third-order natural frequency values ​​calculated by the two finite element softwares have the largest difference, but the two frequency values ​​differ only by 1.78%, and the calculation results are very close. At present, ANSYS software is widely used for modal calculation of various structures, and its calculation results have strong credibility. Therefore, the results calculated by Pro/MECHANICA software also have high precision.
V. Conclusion
(1) Through the modal analysis of the finite element dynamics model of the machine tool carriage, the first three natural frequencies and vibration modes of the machine tool parts are calculated. Through the vibration mode and animation display, the dynamic performance of the machine tool carriage can be analyzed intuitively, and the weak links of the parts are found, which provides a theoretical basis for the structural design of the machine tool support.
(2) Based on the analysis of some shortcomings of general finite element, this paper puts forward the idea of ​​modal analysis of pallet using Pro/MECHANICA finite element analysis software, and realizes solid modeling and finite element analysis calculation through it. Seamless integration improves the efficiency of finite element analysis. By comparing with the calculation results of ANSYS software, we found that the Pro/MECHANICA finite element modal calculation results also have sufficient calculation accuracy. This provides a new approach to the design of other machine tool supports.
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Differential Pressure Gauge
CYW-152E and CYW-153B stainless steel pressure gauge (hereinafter referred to as instrument) is applicable to measure the differential pressure, flow of various fluids(gases) in the industrial processes among the industrial sectors including the chemical, chemical fiber, metallurgy, power and nuclear power industry.
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