Special Issue; Products for Industrial Machinery - NTN

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NTN TECHNICAL REVIEW No.742006 conditions when compared to the conventional bearings. In particular, under a high-loading condition, the life of the authors’ Ultra-Clean NC bearing is more than 10 times as long compared to the conventional bearings subjected to the same demanding conditions. 3. Introduction to NTN Ultra-Clean WB Bearings (Fig. 6) Aware of the lubricating power of tungsten disulfide (hereafter, “WS2”), NTN adopted one rolling element made of this material (Fig. 7) in the Ultra-Clean WB bearing. When the WS2 rolling element rolls in the bearing, WS2 is transferred onto the rolling surface and functions as a solid lubricant. Additionally, since WS2 can withstand a maximum temperature of 400˚C, which is much higher heat resistance compared to conventional special PTFE coating, the Ultra-Clean WB bearing is an ideal choice for vacuum and hightemperature environments such as those on vacuum evaporation systems and sputtering systems. results in Fig. 8, the rotating torque with the Ultra- Clean WB bearing is much lower than that with the conventional bearing (special PTFE-coated type). Test bearing Rotating torque mNm 25 20 15 5 0 Table 4 Test conditions of rotating torque Degree of vacuum Running speed Temperature Thrust load Deep groove ball bearing (#608) 8227 mm Ultra-Clean WB bearing 10 -5 Pa 500 min -1 Ordinary temperature 196N Special PTFE-coated type Fig. 8 Results of rotating torque WS2 rolling element Fig. 6 Ultra-Clean WB bearing WBWS2 Ball Lubrication with tungsten disulfide ball 3.1.2 Endurance 1) High-temperature (300˚C) endurance test The applicable test conditions are summarized in Table 5, while the test results are illustrated in Fig. 9. The life of the Ultra-Clean WB bearing is more than five times as long as that of the conventional bearing (special PTFE-coated type). 2) High-load endurance test The test conditions used are summarized in Table 6, while the test results obtained are illustrated in Fig. 10. The life of the Ultra-Clean WB bearing is more than nine times as long as that of the conventional bearing (special PTFE-coated type). Fig. 7 WS2 ball 3.1 Evaluation of various performance considerations 3.1.1 Rotating torque Under the test conditions summarized in Table 4, the rotating torque of the Ultra-Clean WB bearing in a vacuum was evaluated. As can be seen from the 4. Conclusion Products incorporating flat panel displays, such as personal computers and flat-panel TV sets, have become used more commonly, and demands are growing rapidly for bearings capable of use in the clean-environment manufacturing systems for these products. NTN believes that our Ultra-Clean NC bearings and Ultra-Clean WB bearings, which are enhanced variants of conventional Ultra-Clean -82-
Ultra-Clean Bearing for Clean Environments Table 5 Test conditions Table 6 Test conditions Test bearing Deep groove ball bearing (#608) 8227 mm Test bearing Deep groove ball bearing (#608) 8227 mm Degree of vacuum Running speed 10 -5 Pa 1,550 min -1 Degree of vacuum Running speed 10 -5 Pa 500 min -1 Temperature 300˚C Temperature Ordinary temperature Thrust load 9.8N Thrust load 256 N End of life criterion The point when a sudden increase in torque occurred End of life criterion The point when a sudden increase in torque occurred 10000 100000 Endurance h 1000 100 10 Cessation of test run Endurance h 10000 1000 100 10 Cessation of test run 1 Ultra-Clean WB bearing Special PTFE-coated type Fig. 9 Results of high temperature endurance test 1 Ultra-Clean WB bearing Special PTFE-coated type Fig. 10 Results of heavy load endurance test Lubrication system Temperature range tolerance (˚C) Degree of vacuum tolerance (Pa) Load bearing capacity Low torque feature Dust generation Corrosion resistance Table 7 Performance of Ultra-Clean bearing series Ultra-Clean bearing Special PTFE-coating Optimal Good Acceptable Ultra-Clean bearing Low dust-generating vacuum grease Ultra-Clean NC bearing Porous resin cage + low vapor pressure oil Ultra-Clean WB bearing Tungsten disulfide (WS2) +260 +200 +150 +400 10 -6 atm 10 -5 atm 10 -5 atm 10 -5 atm bearings, will satisfy the characteristics required of these manufacturing systems: low dust generation, tolerance of high vacuum conditions, and higher levels of endurance and heat resistance. NTN has already added new products to its Ultra-Clean bearing Series (see Table 7). We will continue to develop unique products that satisfy market needs, and we hope to contribute to improvements in various vacuum systems by helping extend their maintenance intervals and reduce their energy consumption. Photos of authors Ryouichi NAKAJIMA Industrial Engineering Dept. Industrial Sales headquarters Masaaki HONDA Industrial Engineering Dept. Industrial Sales headquarters -83-
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88th Anniversary Special Issue; Pro
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Development of a New Grease Lubrica
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Minimum Quantity and Cooling Jet Lu
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Minimum Quantity and Cooling Jet Lu
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