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In the case of high-speed ball bearings used for supporting high-speed motors of EV(Electric Vehicle) and HEV(Hybrid Electric Vehicle), high rotational speeds cause large centrifugal forces when the bearings operate. If a large centrifugal force is applied to the retainer, it causes deformation. This causes interference between the retainer and the rolling element, thereby accelerating the heating and wear of the retainer. This is a major cause of reduced fatigue life of high-speed ball bearings. Therefore, in this paper, in order to minimize retainer deformation by centrifugal force, the material and design of the retainer were changed. The deformation by centrifugal force was measured by FEA(Finite Element Analysis) and based on this, we devised optimum design of retainer.
CFRP(Carbon Fiber Reinforced Plastics) has been used many industries aerospace, automobile, medical device and building material industries, etc. Because it is lighter than other metals and has good properties, such as rigidity, strength and wear. CFRP may be cured integrity. However, it needs postprocessing similar to drilling or endmilling for shape cutting and combination of various material. In this paper, tool dynamometer and accelerometer used to signal analysis for machining properties under various cutting conditions and tool shape changes. In addition, microscope used to verify the machined CFRP surface. As the results, it was found that the cutting force and the vibration were decreased in the increasing of cutting edge (2-flute < 4-flute < composite tool), and the good machined surface can be obtained in this experiments.
Recently, LDI(laser direct imaging) technoloy is being researched to make micro circuit pattern. In this study, LDI system was developed using DMD(digital micromirror device) and experiment of pattern generating according to focal length was perfomed. Generated noncontinuous pattern due to gap of DMD was changed to continuous pattern by control of focal length. Width of pattern was increased by defocusing. Therefore, optimal focal length was selected by measurement of profile. As a result, optimal focal length was selected location of 120μm away from focus.