Latest research clearly demonstrates the excellent capability of the gear power skiving technology. For further improvement of the skiving process and enhancement of the process reliability, the fundamental research on the cutting mechanism of cylindrical gear power skiving was conducted. First, the kinematic model of power skiving and mathematical of tapered skiving cutter were established according to the engagement principle of crossed helical gears. Then, the simulation process and chip deformation mechanism were developed. Based on the proposed modeling, we investigated the cutting mechanism, including the cutter top rake angle related to the cut strategy, skiving accuracy with respect to the gear number, and tooth ratio. The results support the skiving cutter design and process optimization and are an important basis for the implementation of the advanced gear process.
The rigidity and damping characteristics of a large and heavy NC rotary table have great influence on machining efficiency and the integrated machine's dynamic accuracy, but test and control methods related to these characteristics are difficult to apply. In the axial direction, the table was supported by a constant current hydrostatic guideway; the guideway's surface roughness and planeness errors were the main factors contributing to hydraulic oil leakage. Based on the force analysis of a ZT20SW driven by double worm gear pairs, a dynamic model and an electromechanical-hydraulic coupling model in the circumferential direction were established. Simulation and experimental results altogether indicated that the cutting force on the table, leakage characteristics and Coulomb frictional force of the hydrostatic guideway each have great effects on dynamical accuracy. In addition, test methods on the leakage's equivalent oil film thickness offer a new comprehensive evaluation standard for the hydrostatic guideway's geometric errors. The hydrostatic guideway's Coulomb frictional force can be controlled reasonably to improve the table's dynamic accuracy.Keywords large and heavy NC rotary table, double worm gear pairs, leakage characteristic of the hydrostatic guideway, electromechanical-hydraulic coupling model, supporting rigidity and damping characteristics Date
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