CB/T 3502-1992 Technical requirements for repair of cylinder liners of marine diesel engines CB/T3502-1992 standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
Technical Requirements for Repair of Cylinder Liners of Marine Diesel Engines CB/T3502-92
Classification Number: R32
Subject Content and Scope of Application
This standard specifies the technical requirements for repair of cylinder liners of marine diesel engines. This standard applies to the cylinder liners of marine diesel engines and other auxiliary machinery prime movers
Repair of cylinder liner defects
After the inner bore is worn, the maximum increase in diameter, ceramic and phase density do not exceed the provisions of Table 1, and it can continue to be used. The cylinder liners whose inner diameter increase exceeds the provisions of Table 1 can be repaired or replaced by Sichuan Jincheng Spraying Technology 1.
For sleeves with inner diameter increase not exceeding the provisions in Table 1 and with turning angle and consumption exceeding the provisions, machining method can be used for repair. However, the inner diameter increase after machining shall not exceed the provisions in Table 1.
Approved by China State Shipbuilding Corporation on January 8, 199350
Implemented on July 1, 1993
Inner diameter of cylinder sleeve
85~200
>200~300
>300~400
>400~500
>500~600
>600~700
>700~800
>800~900
>900~1000
>1000~11 00
CB/T3502-92
Inner diameter increment
Roundness, cylindricality
For longitudinal scratches on the inner hole surface, if the width does not exceed 0.2% of the inner diameter, the depth does not exceed 0.05% of the inner diameter, the total number of scratches does not exceed 3, and the interval between two scratches is not less than 50mm, it can be polished with sandpaper or oilstone to make the scratch surface smooth and continue to be used.
If the longitudinal scratches on the inner hole surface exceed the above provisions, the scratches must be removed by machining or the width or depth of the scratches must be reduced to the above range. The inner diameter increment after adding 1 shall not exceed the provisions of Table 1.
2.1.3 Defects such as pores, shrinkage holes, sand holes, slag inclusions and mechanical damage on the inner hole surface of the cylinder liner shall not exceed the provisions of Table 2.
Defects exceed the provisions of Table 2, Must be replaced or machined to eliminate defects before continued use, the inner diameter of the cylinder liner after machining shall not exceed the provisions of Table 1. www.bzxz.net
New true diameter
CB/T3502-92
Allowed defects
Stress area at the upper 2/3
Defect diameter
Defect depth
Repair of corrosion pits on cylinder liner
Non-stress area
Defect diameter
Defect depth
The total number of various defects shall not exceed
more than 3,
the interval between two defects shall be greater than
and there shall be no looseness around the defects
Corrosion pits on the cooling water cavity surface of the outer circle of the cylinder liner due to cavitation and other reasons The pits must be repaired or replaced in accordance with the conditions specified in the original "Diesel Engine Manual".
The cooling water cavity of the cylinder liner and the surface of the corrosion pits that are allowed to exist shall be protected by metal plating or other anti-corrosion layers after rust removal and cleaning, but the plating should not affect the thermal conductivity of the cylinder wall.
2.3 Repair of the upper and lower contact surfaces and sealing areas of the upper boss of the cylinder head 2.3.1 The contact surface between the upper boss and the cylinder body shall be smooth and flat, and cracks and corrosion pits that affect the sealing performance are not allowed. The contact surface (concave) with the cylinder head shall be smooth and flat, and cracks and dents that penetrate the sealing surface are not allowed.
Except for cracks, the above-mentioned defects can be eliminated by machining methods, and at the same time, it should be considered that the height of the compression chamber after machining should be kept within the range specified in the manual. 2.3.2
The depth of the sealing groove on the outer circle of the repaired gas-tight sleeve should ensure that the "O" type rubber sealing ring protrudes from the outer circle surface, and its protruding height is 15%~20% of the diameter of the "O" type ring bearing surface, and the cross-sectional area of ​​the groove is 1.25 times the area of ​​the "O" type seal.
2.4 Repair of cylinder liner cracks
Cylinder liner cracks must be repaired in strict accordance with the mature process methods approved by the ship inspection department.
For cracks in the lower non-pressure zone, welding, metal buckling or adhesives are used to repair them.
2.5 Repair of the inner hole of chrome-plated cylinder liner
2.5.1 Only the original chrome-plated cylinder liner is allowed to be repaired by chrome plating process. 2.5.2 For loose-hole chrome-plated cylinder liner, the thickness of the chrome plating layer should be controlled at 0 .30.mm or less, the thickness difference should not exceed 0.05mm. 2.5.3 Before chrome plating the inner hole of the cylinder liner, it must be processed with abrasives to remove all the original plating and various defects (including corrosion defects), and the surface roughness Ra<0.8μm.
2.5.4 The surface of the chrome-plated layer should not have defects such as peeling, black scars, hairline, pitting and mechanical damage. The surface roughness Ra<0.8μm after machining after chrome plating. 2.5.5 After machining the chrome-plated surface, its roundness and cylindricity should not exceed the requirements of Table 3.
3 Technical requirements for cylinder liner machining
3.1 The roundness and cylindricity of the inner hole of the cylinder liner should not exceed the requirements of Table 3. 53
Inner diameter of gas spare sleeve
85~200
>200~300
>300~400
> 400 ~ 500
> 500~600
> 600 ~700
>700~800
>800 ~900
>900~1000
CB/T 350292
Roundness, wear resistance
>1000~1100
The runout of the outer circle of the cylinder sleeve and the upper and lower flats of the upper shoulder to the center of the inner hole of the cylinder sleeve shall not exceed the provisions of Table 4.
Inner diameter of the cylinder sleeve
85~200
>200 ~300
>300~400
>400 ~500
>500~600
>600~700
> 700~ 800
>800-900
>900~1000
>1000~100
Radial
Total runout of outer circle
Total runout of end surface of upper and lower planes of upper convex room
CB/T3502-92
The roughness of machined surface shall not exceed the requirements in Table 5. Table 5
Processing parts
High-speed diesel engine
Cylinder sleeve inner hole surface
Medium-speed diesel engine
Low-speed diesel engine
Cylinder sleeve and cylinder body match external valve
Upper and lower planes of the upper shoulder of the cylinder sleeve
Cylinder sleeve installation requirements
Machine accuracy RA
Cylinder sleeve is pressed into the cylinder body, and the sleeve inner diameter size is checked. The total change amount shall not exceed 1.5 times the value specified in Table 3.
After the cylinder sleeve is pressed into the cylinder body, the cooling cavity shall be subjected to a hydraulic test. The test pressure is 1.25 times the working pressure of the cooling water, and it shall be kept leak-free for 15 minutes.
Additional remarks:
This standard was proposed by the 603 Institute of China State Shipbuilding Corporation. This standard was drafted by the Tianjin Ship Repair Research Institute of China State Shipbuilding Corporation, and this standard was drafted by Jiangnan Shipyard. The main drafters of this standard are Cai Guopa, Shi Zhengyi and Yao Rongyuan.
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