UNSM Surface Technology for Manufacturing and Remanufacturing Torsion Bars for Crawler Vehicles

초음파 나노표면개질을 적용한 궤도차량용 토션바 제조 및 재제조용 표면 개질기술에 관한 연구

Suh, Chang-Min;Pyoun, Young-Sik;Cho, In-Ho;Baek, Un-Bong

  • Received : 2011.08.11
  • Accepted : 2011.12.23
  • Published : 2011.12.31


The Ultrasonic Nanocrystal Surface Modification (UNSM) technology improves the fatigue life of a torsion bar by inducing compressive residual stress on the surface layer. The UNSM is applied to replace the presetting method and shot peening technology. The torsion bar must be changed periodically because of a lack of durability and a phenomenon related to the stress relaxation. The torsion fatigue test specimens were made of DIN17221 material, and the results showed that the fatigue life was 5 times more than under durability test conditions. A comparison test between the commercial vehicles' presetting method and shot peened torsion bar and the UNSM torsion bar showed that the UNSM could replace the presetting method and shot peening.


Torsion bar;Remanufacturing;Ultrasonic nanocrystal surface modification UNSM;Presetting;Shot peening SP;Stress relaxation


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