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유리섬유 강화 폴리아미드 웜기어의 유리섬유 방향에 따른 마모특성
김성수(Seong Soo Kim),안희철(Hee Chul Ahn),신민욱(Min Wook Shin),장호(Ho Jang) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
Wear of glass fiber reinforced polyamide composites for C-EPS (Column-type Electric Power Steering) worm gear is studied. Main focus of this work is given to moisture absorption of the composites and its effect on wear characteristics. Worm gears in 3 different types are manufactured by modifying the injection design using glass fibers and polyamide (PA12). Mechanical properties of the gears, such as hardness and strength, are evaluated first in terms of the orientation of glass fibers in the composite and then tribological properties are examined. The friction and wear of the worm gear was measured by a specially designed friction tester for worm gears, which measures amount of wear and backlash. Results indicate that the worm gear manufactured by the upper injection design shows the lowest backlash increase compared to the other two cases. Amount of backlash is also decreased by using upper injection design in a wide range operation condition. Particularly noteworthy is the finding that the contact angle of glass fiber has a remarkable effect on the wear characteristics.
폴리아미드 12 기지소재의 유리섬유 함량과 방향에 따른 마모특성
김성수(Seong Soo Kim),안희철(Hee Chul Ahn),신민욱(Min Wook Shin),장호(Ho Jang) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
Tribological properties of glass fiber reinforced polyamide 12 (PA 12) resin are studied by changing the orientation of the fibers and fiber contents in the composite. The friction level and wear amounts are measured using a block-on-disk tester and microscopic interpretation of the friction and wear is given based on the observation of surface topography after tests using an SEM. The results show that PA 12 reinforced with 50% glass fiber manufactured with normal orientation has the best wear resistance with the low friction level compared to the composites with the parallel alignment or other fiber contents. Particularly noteworthy is the finding that the PA 12 with an optimum content of the glass fiber in normal alignment can substitute the PA 66 which has been limited in its application for a worm gear due to moisture absorption.
신민욱(Min Wook Shin),장호(Ho Jang),김성수(SeongSoo Kim),안희철(Hee Chul Ahn) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
Wear characteristics of two different Polyamides (PA66 and PA6l2) for worm gears were studied using a block-on-ring friction tester. The friction coefficient, weight loss, and wear scar width were measured during friction tests and surfaces were examined using an optical profiler and SEM. Results showed that viscosity had a significant influence on friction coefficient and wear performance. The worm gear with lower viscosity showed lower friction coefficient and better performance in wear resistance. The wear mechanism of the two polyamides was discussed considering the transfer of polymer to steel surface.
신민욱(Min Wook Shin),장호(Ho Jang),김성수(SeongSoo Kim),안희철(Hee Chul Ahn) 한국트라이볼로지학회 2010 한국트라이볼로지학회 학술대회 Vol.2010 No.6
The friction and wear characteristics of polyamide 66 (PA66) reinforced with glass fibers were investigated. Wear tests were carried out using a block-on-ring friction tester using a modified ASTM D-2714 test procedure. A particular attention was given to the effect of glass fibers content on the wear resistance and friction level of the composite. Results showed that the composite with low glass fiber contents exhibited the low friction coefficient and improved wear resistance than the composite with high glass fibers contents. The polymeric wear debris transferred to the steel surface at elevated temperatures had a significant effect on the wear rate, while the glass fibers decreased the friction coefficient and improved the wear resistance by reinforcing the polymer matrix.