learning task 4 ----maintenance and repair of important engine parts learning task 4 maintenance and...
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Learning task 4----maintenance and repair of important engine parts
Learning task 4
maintenance and repair of important engine parts
Yu YongYan
April 18, 2023
04/18/23
Learning task 4----maintenance and repair of important engine parts
Task 4 …
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
3
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）
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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
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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
Cylinder liner
Piston Ring
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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
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Learning task 4----maintenance and repair of important engine parts
Fiction &wear
Corrosion
Crack
Fiction &wear
Corrosion
Crack
High pressure
High temperature
High speed
Inferior fuel oil
High pressure
High temperature
High speed
Inferior fuel oil
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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
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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
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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
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Learning task 4----maintenance and repair of important engine parts
Dye Penetration Test 着色检测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
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Learning task 4----maintenance and repair of important engine parts
04/18/23
Learning task 4----maintenance and repair of important engine parts
Cooling water
Lubrication oil
Exhaust gas
3. Crack detection 裂纹检测
3.2Daily Observation 日常检查
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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
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Learning task 4----maintenance and repair of important engine parts
Piston----
Function
Crack
Crack repair
Ⅰto compose combustion chamber
Ⅱ to compress the suction air
Thermal crack on top surface
Mechanical crack in cooling space
Machining, grinding
Welding ， adhesive ， metalock
Renewal
04/18/23
Learning task 4----maintenance and repair of important engine parts
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