Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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Tribology Characteristics of Hexagonal Shape Surface Textured Reduction Gear in Electric Agricultural Vehicle

  • Choi, Wonsik (Department of Bio-industrial Machinery Engineering Pusan National University) ;
  • Pratama, Pandu Sandi (Life and Industry Convergence Research Institute Pusan National University) ;
  • Byun, Jaeyoung (Department of Bio-industrial Machinery Engineering Pusan National University) ;
  • Kwon, Soonhong (Department of Bio-industrial Machinery Engineering Pusan National University) ;
  • Kwon, Soongu (Department of Bio-industrial Machinery Engineering Pusan National University) ;
  • Park, Jongmin (Department of Bio-industrial Machinery Engineering Pusan National University) ;
  • Kim, Jongsoon (Department of Bio-industrial Machinery Engineering Pusan National University) ;
  • Chung, Songwon (Department of Bio-industrial Machinery Engineering Pusan National University)
  • Received : 2018.09.28
  • Accepted : 2019.01.07
  • Published : 2019.01.31
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Abstract

An experimental study was conducted on the wear and friction responses in sliding tests of a micro-textured surface on laser pattern (LP) steel as reduction gear material in electric guided vehicle. In this research, the friction characteristics of laser pattern steel under different micro texture density conditions were investigated. The friction tests were carried out at sliding speeds of 0.06 m/s to 0.34 m/s and at normal loads of 2 to 10 N. Photolithography method was used to create the dimples for surface texturing purpose. Four different specimens having different dimple densities of 10%, 12.5%, 15%, and 20% were observed respectively. In this research, friction conditions as shown in Stribeck curve were investigated. Furthermore, the microscopic surface was observed using scanning electron microscope. It was found that the dimple density had a significant role on the friction characteristics of laser pattern steel conditioned as reduction gear material in an agricultural vehicle. The duty number showed that the friction condition was hydrodynamic regime. The best performance was obtained from 12.5% dimple density with lowest friction coefficient achieved at 0.018771 under the velocity of 0.34 m/s and 10N load.

Keywords

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Fig. 1 Scanning electron microscope dimple pindensity before experiment (a) 10%, (b) 12.5%, (c) 15%, and (d) 20%.

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Fig. 2 Hexagonal array observed under scanning electron microscope (SEM).

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Fig. 3 Schematic of experimental apparatus.

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Fig. 4 Stribeck’s curve.

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Fig. 5 Friction coefficient as a function of density at 0.06m/s.

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Fig. 6 Friction coefficient as a function of density at 0.22m/s.

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Fig. 7 Friction coefficient as a function of density at 0.34m/s.

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Fig. 8 Friction coefficient as a function of duty number at 2N.

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Fig. 9 Friction coefficient as a function of duty number at 6N.

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Fig. 10 Friction coefficient as a function of duty number at 10N.

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Fig. 11 SEM image of dimpled pin (a) dimple condition before test and (b) dimple condition after test.

Table 1. Summary of Test Conditions

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