Transcript 于永妍讲课稿
Learning task 4 ----maintenance and repair of important engine parts Learning task 4 maintenance and repair of important engine parts Yu YongYan April 13, 2015 Learning task 4 ----maintenance and repair of important engine parts Task 1 Friction & wear, corrosion, and crack Task 2 How to detect and determine the cause of failure Task 3 How to repair those failures Task 4 … 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts Cylinder head（气缸盖） Cylinder liner （气缸套） Piston （活塞） Piston ring （活塞环） Crankshaft （曲轴） Bearing （轴承） 3 Learning task 4 ----maintenance and repair of important engine parts 1. Function of piston 活塞的作用 Function Ⅰ to compose combustion chamber 活塞作用一，组成燃烧室 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts Other components of combustion chamber 组成燃烧室的其他零件 Cylinder cover 4/13/2015 Cylinder liner Piston Ring Learning task 4 ----maintenance and repair of important engine parts Function Ⅱ to compress the suction air 活塞作用二，进气压缩 Compression temperature —— 500-700℃ Compression pressure 4-8MPa —— Compression speed —— 600r/m 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts High pressure Fiction &wear High temperature Corrosion High speed Crack Inferior fuel oil 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 2. Crack on piston活塞裂纹 2.1 Thermal crack on the top surface 活塞顶部容易出现热疲劳裂纹 High temperature Strong and changeful mechanical stress 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 2. Crack on piston活塞裂纹 2.2 Mechanical crack in the cooling space 活塞冷却侧容易出现机械疲劳裂纹 Strong and changeful mechanical stress Crack through严重的话会产生穿透性裂纹 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 3. Crack detection裂纹检测 3.1 Non Destructive Test 无损检测 Observation 观察法 Dye Penetration Test着色检测 Magnetic Test 磁粉检测 Ultrasonic Test超声波检测 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts Dye Penetration Test着色检测 Cleaner清洗剂 Penetrant 渗透剂 Imaging agent 显像剂 Imagine you are a surveyor 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 3. Crack detection裂纹检测 3.2Daily Observation日常检查 Cooling water Lubrication oil Exhaust gas 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 4. Crack repair裂纹修理 •Machining, grinding----光车，打磨 • Welding，adhesive，metalock •----焊接，胶粘，金属扣合 • Renewal ----换新 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts Piston---Function Ⅰto compose combustion chamber Ⅱ to compress the suction air Crack Thermal crack on top surface Mechanical crack in cooling space Machining, grinding Crack repair Welding，adhesive，metalock Renewal 4/13/2015 Learning task 4 ----maintenance and repair of important engine parts 4/13/2015