A Study on Prodution and Inspection of Sliding Bearing for Large Marine Diesel Engines

In recent years, marine engine for ship has been developed to achieve high efficiency and environmental regulation. Environmental issues have been highlighted globally and evolved as one of the mist hot issues in the decade. The Marine industry has finally reached to their target about emissions 0.5% sulphur cap introduced IMO to become a compulsory rule as of 2020 globally. It has impacted the maritime industry greatly and shipping companies specifically as for a role of ships operation at sea. To comply with IMO Tier III regulations two major NOx reduction technologies can be selected, EGR or SCR or main engine modification. Which technology is preferred depends on market demands, engine size, other requirements and operational pattern. In case of hydrodynamic plain bearings, there are two kinds of bearings which the sliding bearing surface of the steel backing is made of Tin based white metal(HM07) or Tin Aluminum(AlSn2) usually. Recently, in order to reduce production costs, no machining of bearing girder side walls is applied after welding. main bearings are of the well-proven thin shell design using white metal as bearing material. This paper describes the design theory, fluid lubrication theory, type of bearing and bearing production for quality manager, quality inspector, production supervisor, class surveyor, marine engineer and superintendent from each parties concerned. Also, this paper describes the inspection during bearing production and after engine assembly of usage of sliding bearing, especially tin based white metal(HM07) for Large Marine Diesel Engines. In this paper by using bearing crush measurement program, if it is necessary to check the bearing crush measurement at engine test bed during engine assembly or on board in service to secure a locked position of the bearing with no risk of relative movement, everyone can check this measurement and this program for bearing crush measurement is available upon request. That would be very helpful for all concerned at engine maker, classification, owner side and shipyard.제 1 장 서 론 1 1.1 연구배경 1 1.2 연구의 목적 및 내용 2 1.3 논문의 구성 4 제 2 장 베어링 이론 및 소개 5 2.1 베어링과 윤활 5 2.2 유체윤활 6 2.3 페트로프 식 9 2.4 베어링 라이닝 메탈의 재료 11 2.5 강재(Backing material) 16 2.6 베어링의 종류 18 2.7 화이트 메탈 베어링의 제작 방법 27 2.8 화이트 메탈 베어링의 주조 방법 58 제 3 장 화이트 메탈 베어링의 검사 방법 60 3.1 화이트 메탈 베어링 제작 중 검사 방법 60 3.2 화이트 메탈 베어링 엔진 운전 후 검사 방법 80 제 4 장 베어링 초음파탐상검사법에 대한 고찰 93 4.1 개정 전 M사 초음파탐상검사(Ultrasonic testing)방법 93 4.2 개정 후 M사 초음파탐상검사(Ultrasonic testing)방법 94 4.3 ISO UT 검사 방법 99 4.4 개정 전·후 M사 초음파탐상검사 방법의 비교 분석 105 제 5 장 베어링 크러시 시험에 대한 고찰 118 5.1 베어링 크러시 측정 절차 118 5.2 메인 베어링 크러시 측정 122 5.3 M사 베어링 크러시 측정 프로그램 125 5.4 베어링 크러시 측정 시기 130 제 6 장 결론 132 참고문헌 136Maste