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The test and measurement system was established to facilitate the study of the mechanical performance of the high-speed machining machine table and establish a test stand for the mechanical shaft. In the test bench design, a system consisting of a motor, a coupling, a ball screw, a support bearing, a moving table, and the like, and mechanical follow-up of the external inertia and the mechanical shaft are established. CNC in the CNC, the speed can be optimized online along the trajectory. The deviation of the transition arc path depends mainly on the selected tolerance.
Mechanical device / component M resonant frequency limits its dynamic characteristics, friction caused by vibration vibration mechanical vibration, heating or machining errors will cause geometric errors and tool errors caused by imbalance caused by too low or too high spindle speed. The jack or tool edge is not sufficiently ground, and the vibration or tool imbalance causes the relative deviation of the tool. The test curve was obtained in the performance test to change the motor speed from 1000 Hz to 5000 Hz, and the load size was changed to 50 N and 100 N curves. Test curve analysis All curves show that the instantaneous yield stress change of the motor starting and stopping is very obvious and relatively complicated. It is also found that the variation of the yield stress of the motor during acceleration and deceleration is complicated.
When the speed is 1000-1500Hz, the magnitude of stress change is small. When the speed reaches 3000Hz or even 6000Hz, the stress amplitude is very large, and the variation is complicated. When the speed is above 3000 Hz and the load also changes, the curve change is more complicated. At the same time, it can be seen that the curve has obvious hysteresis due to the increase of the load. The test results show that the positioning accuracy of the table is affected by the torsion and axial deviation of the ball screw, the linear deviation and rotation deviation of the moving table, the rigidity of each component, and the contact deformation of the ball screw and the nut. The positioning accuracy of the table also causes significant trajectory deviation due to sudden changes in speed.
Conclusion In high-speed motion machining, various deviations and deformations of the drive device seriously affect the machining accuracy of the workpiece. Effective measures need to be taken to improve positioning accuracy. Elastic deformation compensation measures can be taken, and a lightweight rigid moving table is used to increase the rigidity of the table and reduce the load, so as to improve the positioning accuracy and improve the machining accuracy of the workpiece. This problem is especially important for high speed machining centers where speed and acceleration are high. In addition, mitigating the quality of the mobile workbench has become an urgent problem in the design of high-speed machine tools, while also reducing the size of the ball screw diameter. Therefore, the use of lightweight rigid mobile workbench has become an important means of machine tool design.
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