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- Title
Design and Experimental Investigation of Innovative Fully Ceramic Spindle-bearing System for NC Machine Tools.
- Authors
Songhua Li; Yusheng Zhu; Yuhou Wu
- Abstract
High-speed machining (HSM) is a forward-looking areas for drastically reducing production time and improving production efficiency. The implementation of HSM strategically depended on development of spindle technology. However, Traditional spindles are not suitable for high speed condition because of their low damping ratio and high rotational inertia. In addition, centrifugal force and heat generation caused by high speed rotation of conventional steel spindles have been obstacles for improving the limit speed. The application of new materials is an fascinating alternative to increase life-time and the boundary speed of bearings. The high performance hybrid steel/ceramic bearing or ful-ceramic and other ceramic structure components has emerged because of advanced structure ceramics as an extraordinary potential material. For this research study, an innovative speed fully ceramic system of spindle-bearing provided with superior performance characteristics of structural ceramics shaft but also ful-ceramic bearing without inner rings were effective developed and optimization designed. Internal structure parameters factor of full ceramic ball bearing were optimized and designed based on its failure mechanism analysis. The preload and lubrication condition of high-speed spindle-bearing system were optimized. It implements a highprecision, high-speed assembled with ceramic electric spindles, which maximum speed achieves 30000r/min, and maximum power achieves 15kW. Performance test and analysis of the developed ceramic motorized spindle were completed. Experimental results showing that the radial run out of shaft is less than 1μm, in the condition of best lubrication and appropriate preload, radial rigidity of the ceramic spindle achieves 322N/μm, no-load vibration is less than 0.8mm/s, no-load temperature rise is less than 10 °C. Motorized spindle of ceramic can reduce the high-speed rotational moment of inertia, increase the rigidity and greatly improve totating precision of the system of spindle-bearing, on account of physical characteristics of engineering ceramics such as light weight, resistance abrasion and good thermal, so as to accommodate the high precision and high speed demand of spindle system for NC machine tools.
- Subjects
CERAMIC bearings; SPINDLES (Machine tools); STIFFNESS (Mechanics)
- Publication
Metallurgical & Mining Industry, 2016, Issue 2, p68
- ISSN
2076-0507
- Publication type
Article