Torsional Research Of Anti-backlash Transmission System

During the sawing process of circular saw, each sawtooth cut the workpiecesuccessively, thus resulting in severe vibration problems and unnecessary impacton the gears, which will have bad effect on gear transmission and this willreduce the lifespan of the gears. On the other hand, this impact has bad affect onmachining quality of pipe section and the service life of circular saw. Thus it’snecessary to eliminate gear backlash of transmission gear box, so that the impactforce is minimized.First of all, we summarize the applied methods and advantages anddisadvantages of various kinds of anti-backlash mechanism based on domesticand foreign research, in conjunction with the working state of hard alloy circularsaws, to select an appropriate anti-backlash method. After comparing andanalyzing, we choose torsion bar eliminating method as the foundation todesign a better spindle box non-backlash gear transmission mechanism and thepreload loading mechanism for circular saws.Secondly, through the analysis and study of the working process of hardalloy circular saw, a simple dynamic cutting force model is established based oncutting graphics. Using MATLAB to establish cutting force fluctuation basedon cutting model simulation, the dynamic curve is obtained and vibrationsituation of every moment can be analyzed. According to the summary, we knowthat in the selection of circular saw, the diameter should be as small as possibleaccording to the cutting requirement; the number of teeth should be relatively asmore as possible. At the same time we use FFT figure to do research on the frequency response of dynamic cutting force, in order to provide a reference forthe estimate of structural characteristics of the transmission system and furtheroptimization and design.Finally, through dynamic curves of cutting force caused by cutting steelpipe to create the models of two transmission system with the help of AMESimare established. Comparing and analyzing the angular acceleration of originalgear transmission and non-backlash gear transmission. Simulation results showthat the vibration of anti-backlash gear transmission is much smaller than theoriginal one, and this can also speed up the settling time of the system. We canreally reduce vibration between the tooth side, reducing the impact on the toothsurface, which proved that non-backlash transmission system has betterfeasibility and correctness.