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다공질 자용성 합금 피복에 의한 열간 압연용 런-아웃 테이블 롤러의 내구성 향상에 관한 연구

A Study on Improvement of Durability for Run-out Table Roller with Hot Rolling by Porous Self-fluxing Alloy Coating

  • 배명환 (경상대학교 공과대학 기계공학부) ;
  • 박병호 (경상대학교 대학원) ;
  • 정화 (한국폴리텍VII대학 진주캠퍼스 컴퓨터응용기계과)
  • 투고 : 2011.11.10
  • 심사 : 2012.03.15
  • 발행 : 2012.03.31

초록

본 연구목적은 열간압연용 런-아웃 테이블 롤러 표면의 기계적 성질을 개선하기 위해 다공질 자용성 합금으로 피복하는 방법을 개발하는 것이다. 열간압연에서 런-아웃 테이블의 롤러 내구성을 높이기 위해서는 고온에서 롤러표면의 경도를 높게 유지해야 하고, 내마모성, 내식성, 내열성, 내소부성 및 내응착성의 향상을 유지하여야 한다. 또한, 고온의 열연 강판을 안정적으로 이송할 수 있도록 하기 위해서는 롤러표면에 적절한 마찰계수를 유지하도록 하여야 하고, 롤러와 강판 사이에 미끄럼 발생이 없어야 한다. 본 연구에서는 자용성 합금에 텅스텐카바이드를 첨가시켜 서메트화하여 롤러의 내마모성을 증대시켰고, 미세 철분말을 롤러표면에 피복하여 다공질을 만들어 마찰계수를 높이고 붙잡음성을 향상시켰다. 그 결과, Ni-Cr 피복 롤러에 비하여 다공질 자용성 합금 피복 롤러는 피복층에 철분이 5 ~ 10 wt%로 많이 함유되어 재용융 공정에서 전기로로 가열하여 일부분만 합금화되고 나머지는 산화 및 용해에 의해 탈락되어 다공질로 나타나 강판과의 붙잡음성을 향상시켰다.

The objective of this research is to develop the coating technique by a porous self-fluxing alloy for improving the mechanical properties of run-out table roller surface with the hot rolling. To enhance the durability of run-out table roller with the hot rolling, the high hardness of roller surface should be maintained at high temperatures, and the improvement of wear resistance, corrosion resistance, heat resistance, burn resistance and adhesion resistance should be maintained. In order to be able to transport reliably a hot rolled steel sheet, also, the appropriate friction coefficient on the roller surface should be maintained and the slip between roller and steel should not occur. In this study, the wear resistance of roller increases after the self-fluxing alloy is changed to a cermet by adding the tungsten carbide(WC), and the coefficient of friction increases and the ability of grip is improved because the porosities are made by coating with fine iron powder on the roller surface. As a result, it is found that the ability of grip between the steel and the roller coated by a porous self-fluxing alloy contained to 5 ~ 10 wt% of Fe in the coating layer is improved compared to the roller coated by Ni-Cr. This is because the porosities are made after Fe contained in the roller is partially alloyed by heating with a furnace in the fusing process and the rest is eliminated by oxidation and dissolution.

키워드

참고문헌

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피인용 문헌

  1. Evaluation of Cavitation Characteristics for ALBC3 Alloy Coated with Ni-Cr Series Self Fluxing Alloy in Marine Environment vol.19, pp.5, 2013, https://doi.org/10.7837/kosomes.2013.19.5.538
  2. A Study on the Optimal Cutting Depth upon Surface Roughness of Al Alloy 7075 in High-speed Machining vol.21, pp.5, 2013, https://doi.org/10.7467/KSAE.2013.21.5.074
  3. A Study on Characteristics of Durability for Plunger of High Speed and Ultra-High Pressure Reciprocating Pump Using High Velocity Oxygen Fuel Spraying vol.22, pp.5, 2014, https://doi.org/10.7467/KSAE.2014.22.5.020
  4. A Study on Durability Characteristics for Plungers of Conventional Ceramic and Surface Modification by Powder Coating Using High Velocity Oxygen Fuel Thermal Spray vol.24, pp.3, 2016, https://doi.org/10.7467/KSAE.2016.24.3.285
  5. 가변 공기압력 초경면 연마기의 성능 특성에 관한 연구 vol.21, pp.2, 2013, https://doi.org/10.7467/ksae.2013.21.2.009
  6. 부동액에 따른 회주철 라이너의 캐비테이션 부식에 대한 연구 vol.16, pp.4, 2012, https://doi.org/10.14775/ksmpe.2017.16.4.076