CB/T 3563-1993 Technical requirements for repair of marine diesel engine turbochargers
Some standard content:
1994 Issued
People's Republic of China Shipbuilding Industry Standard
Technical Standard for Repair of Marine Diesel Engines
1994 Implementation
China State Shipbuilding Corporation
People's Republic of China Shipbuilding Industry Standard
Technical Requirements for Repair of Marine Diesel Engine Turbochargers CB/T 3563-93
Classification Number: R32
1 Subject Content and Applicability Fan Kang
This standard specifies the technical requirements for repair of marine diesel engine turbochargers. This standard applies to axial flow turbochargers and radial flow turbochargers of marine diesel engines.
Referenced standards
Tolerances of shape and position
GB1184:
Provisions for tolerances not specified
GB9239
Determination of allowable imbalance for balancing quality of rigid rotors ZBJ91008
Balancing quality of turbocharger rotors
CBS55Test methods for turbochargers for marine diesel engines CB/T3498Technical requirements for post-repair tests on marine diesel engines 3
Technical requirements
3.1Technical requirements for repair of components
3.1.1Rotor shaft
China Shipbuilding Industry CorporationApproved on August 27, 1993184
Implemented on March 1, 1994
CB/T 3563-93
3.1.1.1. The radial runout S (see Figure 1) of the impeller and oil pump assembly shaft section of the rotor shaft to the axis AB of the two bearing journals shall not exceed 0.02mm when the diameter d<50mm, and shall not exceed 0.03mm when the diameter d>50mm.
3.1.1.2 Correction is allowed when the rotor shaft is bent and deformed, but effective measures should be taken to eliminate internal stress, and no cracks should be found after non-destructive testing. The radial runout of the shaft after correction should meet the requirements of Article 3.1.1.1. 3.1.1.3 Cracks are not allowed to exist on any part of the rotor shaft. However, when the crack occurs on the non-matching shaft section and the depth is shallow, and the strength of the shaft is sufficient, the crack on the shaft can be ground off and trimmed to be smooth.
3.1.1.4 The fit between the rotor shaft and the rolling bearing shall not be loose, and the surface roughness of the repaired journal Ra<0.8μm. The roundness and cylindricity errors shall not exceed: 0.005mm, and the fit between the journal and the inner ring of the rolling bearing shall comply with the requirements of the supercharger instruction manual or the provisions of Table 1.
Journal diameter>10~18>18~30>30~50>50~800>80~120
>120~180
Allowable deviation
For the supercharger rotor shaft using sliding bearings or floating bearings, the roundness and cylindricity errors of the journal after wear and tear shall not exceed the 11th grade tolerance value of GB1184, and the roundness and cylindricity errors of the repaired journal shall not exceed the 7th grade tolerance value of GB1184, or according to the provisions of Table 2, the journal surface roughness Ra<0.8μm.
Neck diameter
Roundness limit error after wear
Roundness tolerance after repair
>30~50
>50~80
>80~120
3.1.1.6 The scratches with a depth of less than 0.10mm on the surface of the rotor shaft journal and impeller assembly section, seal section, and oil pump assembly section are allowed to be polished and continued to be used. If it exceeds the above range, it should be repaired according to the provisions of Article 3.1.1.7. 3.1.1.7 When the rotor shaft journal is excessively worn or the roundness and cylindricity errors after wear exceed the provisions of Article 3.1.1.5 and the surface damage exceeds the provisions of Article 3.1.1.6, it can be repaired by metal spraying, brush plating, non-etching iron plating and other processes. However, the brush plating process is not recommended for the repair of sliding bearing journals. 3.1.2 Axial flow turbine blades
3.1.2.1 Turbine blades within the range of zone I or zone II in Figure 2 can be reshaped with the help of blade templates if the cross section is deformed. Cold straightening should be used as much as possible. When using hot straightening, the blades should be carefully heated with a neutral flame. The maximum heating temperature is 650℃ (dark red). After shaping, they should be inspected for cracks before use. 3.1.2.2 Minor defects such as impact marks on the concave surface of turbine blades are allowed to be repaired by grinding. The grinding depth shall not exceed 1/6 of the blade thickness at the corresponding position, and the diameter of the grinding area shall not exceed 1/4 of the height h of zone I in Figure 2. 3.1.2.3
The following defects are allowed to be repaired by welding:
a The diameter of a single defect in zone I in Figure 2 is within 1/4 of the height h of zone I186
CB / T 3563-93
, the maximum depth is within 1/4 of the blade thickness at the corresponding position, and the diameter of the defect on the intake side is within 1/10 of the chord length s3
b The diameter of a single defect in zone II in Figure 2 is within the length T of zone II, the maximum depth is within 1/6 of the blade thickness at the corresponding position, and the diameter of the defect on the intake side is within 1/3 of the length T of zone II.
c-aperture,
d-effective length of blade
3.1.2.4 TIG welding should be used for blade repair. The welding material must be the same as the blade material or have similar chemical composition and mechanical properties. The blade after welding should be ground to normal size. The surface roughness of the blade after grinding is Ra<3.2μm
3.1.2.6 All repaired blades must be checked for cracks on the surface by dye penetration method. Blades with cracks cannot be re-welded. 3.1.2.7! When the mosaic blade is cracked, broken or damaged to the extent that it cannot be repaired according to the provisions of 3.1.2.2 and 3.1.2.3, it should generally be replaced with a new blade. When replacing the blade, the corresponding locking plate and tie rod should also be replaced. 3.1.2.8 If the degree of damage to welded turbine blades is the same as that in 3.1.2.7, the blades shall be removed from the wheel disc and new blades shall be welded. After the blades are welded, the color penetration method shall be used to check whether there are cracks around the weld. If cracks are found, they shall be eliminated. 187
CB / T 3563-93
After the new blades are installed, the outer diameter of the impeller shall be processed in accordance with the tolerances specified in the turbocharger instruction manual or in accordance with Table 3. Table 3
*Turbine outer diameter
Allowable deviation
>300～500
>500～750
The increase in the maximum clearance between the turbine outer diameter and the casing after abrasion compared with the new clearance (i.e. the sum of the wear amount of the turbine blade top and the wear amount of the casing) shall not exceed 1% of the effective length of the turbine blade.
Turbine disc
3.1.3.1 No cracks are allowed on any part of the turbine disc. 3.1.3.2
When the bolt holes and dowel pin holes on the assembled turbine disc (see Figure 3) are deformed, expansion and reaming are allowed. The surface roughness of the dowel pin hole Ra<1.6jum. The mechanical properties of the replaced bolts and dowel pins should be consistent with the original materials.
Radial turbine impeller
CB/ T 3563-93
There shall be no cracks on the blade surface of the radial turbine impeller. 3.1.4.2 Grinding is permitted when the depth of defects on the impeller edge (see A, B, C in Figure 4) and the bottom surface between blades (see D in Figure 4) is within 0.5 mm, the depth of defects on the blade surface is within 15% of the thickness of the blade at the corresponding position, the diameter of the defect is not greater than 10 mm, and there are no more than 3 defects on each blade and no more than 6 defects on the bottom surface between two blades. 3.1.4.3 Grinding is permitted when the turbine rim is scratched or curled. After trimming, the gap between the turbine impeller and the casing shall not exceed 1.3 times the maximum gap when newly assembled. 3.1.5 Compressor impeller and inducer
3.1.5.1 There shall be no cracks on any part of the compressor impeller and inducer (hereinafter referred to as the impeller).
3.1.5.2 When the depth of defects on the impeller edge (see A, B, C in Figure 5) and the bottom surface between the two blades (see D in Figure 5) is within 0.5mm, the depth of defects on the blade surface is within 15% of the thickness of the blade at the corresponding position, and the diameter of the defect is not greater than 10mm, grinding is allowed. Yuqifan Blade Shaft
Impeller rim scratches or curling are allowed to be repaired, but after repair, the gap between the impeller 189
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and the casing shall not exceed 1.5 times the maximum gap when newly assembled. 3.1.6 Nozzle Ring
3.1.6.1 When the nozzle ring blade is deformed and the difference between its nozzle throat area and the design value does not exceed ±2.5%, it is allowed to continue to be used. 3.1.6.2 When the depth of the defect on the surface of the spray ring blade is within 30% of the thickness of the blade at the corresponding position, it can be trimmed to make the surface smooth and allowable to leave defect marks.
3.1.6.3 When the assembled nozzle ring blade is deformed and the difference in the spray throat area exceeds the provisions of Article 3.1.6.1, the blade should be disassembled and reshaped. If it cannot be reshaped, a new blade should be replaced. After reshaping or replacing the blade, the nozzle ring throat area at that location should meet the design value.
.3.1.64..When the deformation degree of the cast nozzle ring exceeds the provisions of Article 3.1.6:1, it is allowed to be reshaped. After reshaping, the nozzle throat area at that blade should meet the provisions of Article 3.1.6.1. There shall be no cracks on the blade after reshaping. 3.1.6.5 There shall be no cracks on the surface and head of the assembled nozzle ring blade. 3.1.6.6 When cracks as shown in Figure 6a appear on the edge of the cast-in spray ring blade, if the crack length 1 does not exceed 1/4 of the blade width and the distance E between the crack and the edge is not greater than 5mm, it is allowed to cut off the cracked part (see Figure 6b) and smooth the cut, and continue to use it, but it is not allowed to exceed 3 blades in all blades and it is not distributed continuously.
3.1.7 Sometimes diffuser
CB/ T 3563-93
3.1.7.1 When the depth of the defect on the surface of the diffuser blade does not exceed 10% of the thickness of the corresponding part of the blade, and the depth of the defect on the surface of the blade bottom plate does not exceed 20% of the thickness of the corresponding part, it is allowed to continue to use it after smoothing, but the difference in the throat area after smoothing should not exceed 2% of the design value. 3.1.7.2 There shall be no cracks or serious corrosion defects on the blades of the integral diffuser.
3.1.7.3 When the blades of the assembled diffuser are cracked, broken or have defects exceeding those specified in Article 3.1.7.1, the blades should be replaced. The throat size of the newly replaced blades should meet the design value.
3.1.7.4 The blades of the assembled diffuser should not be loose. If the blades are loose, they should be readjusted, fixed or replaced. The throat size of the adjusted or replaced blades should meet the design value.
3.1.8 Turbine impeller cover
3.1.8.1 When the sum of the wear depth of the inner hole surface of the axial flow turbine impeller cover and the wear amount of the turbine blade top does not exceed 1% of the effective length of the turbine blade, it is allowed to be used after finishing. When it exceeds the above provisions, the wear of the blades and the cover should be considered. If the increase is mainly caused by the wear of the cover, the impeller cover must be replaced.
3.1.8.2 After the axial turbine impeller cover is deformed, the maximum gap between the impeller and the cover shall not exceed the provisions of Article 3.1.2.10. Grinding is allowed when the inner diameter of the cover is less than the lower limit of the original size.
3.1.8.3 When the wear depth of the radial turbine impeller cover (including the turbine impeller cover that is integrated with the turbine housing) is within 0.20mm and the area is not more than 25% of the total area of the surface, it is allowed to be repaired and used. 3.1.8.4 After the radial turbine impeller cover is deformed, the maximum gap between the cover and the impeller shall not exceed the provisions of Article 3.1.4.3. Grinding is allowed when the surface size is less than the lower limit of the original size.
3.1.9 Compressor impeller casing
3.1.9.1 When the sum of the wear depth of the compressor impeller casing and the wear of the impeller rim does not exceed 50% of the new assembly clearance and the area does not exceed 25% of the total area of the casing, it is allowed to be used after being smoothed. 3.1.9.2 After the compressor impeller casing is deformed, the maximum clearance between the casing and the impeller shall not exceed the limit clearance specified in the instructions of the supercharger or 1.5 times the new assembly clearance. Repairs are allowed when the surface size is less than the lower limit of the original size. 3.1.10 Shell
3.1.10.1 After the supercharger casing is corroded, its minimum wall thickness is not less than 50% of the designed wall thickness, and the cooling water cavity of the casing passes the water pressure test of 1.5 times the working pressure (but not less than 0.4MPa), it is allowed to continue to be used. 3.1.10.2 When the local minimum wall thickness of the turbocharger turbine housing exceeds the provisions of 3.1.10.1 or is damaged, welding repair or repair with heat-resistant adhesive is allowed. The repaired housing must be subjected to a water pressure test according to the test pressure specified in 3.1.10.1: and can only be used after passing the test.
3.1.10.3. When cracks occur on the turbocharger turbine housing, welding repair is allowed. After welding repair, the weld should be checked for cracks using the color penetrant method, and a 0.4MPa water pressure test should be carried out. No leakage is allowed.
3.1.10.44
For cracks, corrosion and other defects on the compressor housing made of lead alloy, argon arc welding repair is allowed. After welding repair, a color penetrant flaw detection inspection should be carried out.
3.1.10.5 When the remaining volume of the anti-corrosion zinc block in the cooling water cavity of the housing is less than 1/2 of the original volume, it should be replaced.
Rolling bearings
CB / T 3563-93
3.1.11.1:
When the cumulative working time of rolling bearings reaches their rated service life, new bearings shall be replaced.
3.1.11.2 Rolling bearings shall rotate flexibly, without abnormal noise and overheating. The bearing parts shall be free of defects such as damage, corrosion, cracks, loose cages, etc. 3.1.11.3 When replacing rolling bearings, the model and accuracy grade specified in the technical documents shall be used. Generally, bearings with accuracy not lower than D grade shall be used. 3.1.11.4 The elasticity of the vibration damping plate of the rolling bearing shall be uniform and good, without defects such as biting, excessive wear and fracture. When the above defects occur or the clearance exceeds the specified value, it shall be replaced. When replacing the vibration damping plate, the material and technical performance shall be the same as the original one.
When there are rust spots on the surface of the vibration damping plate, it is allowed to continue to be used after polishing.
3.1.12 Sliding bearings
3.1.12.1 The radial clearance of the sliding bearing (see Figure 7) shall not exceed the limit clearance specified in the turbocharger manual or 1.5 times the upper limit of the new assembly clearance. If it exceeds the limit, it shall be repaired or replaced.
3.1.12.2 The sliding surface roughness of the sliding bearing Ra<0.8μmc3.1.12.3 The lower part of the sliding bearing shall be in uniform contact with the shaft neck, and its contact angle 0 shall be within the range of 45°～.90°, and the axial contact length shall not be less than 80% of the total length. If it does not meet the above requirements, repair is allowed, but after repair, its radial clearance shall comply with the provisions of Article 3.1.12.1.
3.1.12.4 The alloy layer of the sliding bearing shall not have defects such as cracks, peeling, burning, severe corrosion, shelling, etc. If the above defects exist, it shall be repaired or replaced. 1931 When the sum of the wear depth of the inner hole surface of the axial-flow turbine impeller cover and the wear amount of the top of the turbine blade does not exceed 1% of the effective length of the turbine blade, it is allowed to be used after finishing. When it exceeds the above provisions, the wear of the blades and the cover should be considered. If the increase in the gap is mainly caused by the wear of the cover, the impeller cover must be replaced.
3.1.8.2 After the axial-flow turbine impeller cover is deformed, the maximum gap between the impeller and the cover shall not exceed the provisions of Article 3.1.2.10. Grinding is allowed when the inner diameter of the cover is less than the lower limit of the original size.
3.1.8.3 When the wear depth of the radial-flow turbine impeller shell (including the turbine impeller shell integrated with the turbine housing) is within 0.20mm and the area is not greater than 25% of the total surface area, it is allowed to be repaired and used. 3.1.8.4 After the radial turbine impeller casing is deformed, the maximum clearance between the casing and the impeller shall not exceed the provisions of Article 3.1.4.3. When the profile size is less than the lower limit of the original size, grinding is allowed.
3.1.9 Compressor impeller casing
3.1.9.1 When the sum of the profile wear depth of the compressor impeller casing and the impeller rim wear does not exceed 50% of its new assembly clearance and its area does not exceed 25% of the total profile area, it is allowed to be used after smoothing. 3.1.9.2 After the profile of the compressor impeller casing is deformed, the maximum clearance between the casing and the impeller shall not exceed the limit clearance specified in the manual of the supercharger or 1.5 times the new assembly clearance. When the profile size is less than the lower limit of the original size, repair is allowed. 3.1.10 Shell
3.1.10.1 After the supercharger shell is corroded, its minimum wall thickness shall not be less than 50% of the designed wall thickness. If the cooling water chamber of the shell passes the water pressure test of 1.5 times the working pressure (but not less than 0.4MPa), it is allowed to continue to be used. 3.1.10.2 If the local minimum wall thickness of the supercharger turbine shell exceeds the provisions of 3.1.10.1 or is damaged, it is allowed to be repaired by welding or repaired with heat-resistant adhesive. The repaired shell must be subjected to the water pressure test according to the test pressure specified in 3.1.10.1. It can only be used after passing the test.
3.1.10.3. When cracks appear on the supercharger turbine shell, welding is allowed. After welding, the color penetration method should be used to check whether there are cracks at the weld, and a 0.4MPa water pressure test should be carried out. No leakage is allowed.
3.1.10.44
For defects such as cracks and corrosion on compressor casings made of lead alloy, argon arc welding is allowed to be used for repair. After welding, dye penetrant inspection should be carried out.
3.1.10.5When the remaining volume of the anti-corrosion zinc block in the casing cooling water cavity is less than 1/2 of the original volume, it should be replaced.
Rolling bearings
CB / T 3563-93
3.1.11.1:
When the cumulative working time of rolling bearings reaches their rated service life, new bearings should be replaced.
3.1.11.2 Rolling bearings should rotate flexibly, without abnormal noise and overheating. The bearing parts should be free of defects such as damage, corrosion, cracks, loose cages, etc. 3.1.11.3When replacing rolling bearings, the model and accuracy grade specified in the technical documents should be used. Generally, bearings with accuracy not lower than D grade should be used. 3.1.11.4 The elasticity of the vibration damping plate of the rolling bearing shall be uniform and good, without defects such as biting, excessive wear and fracture. If the above defects occur or the clearance exceeds the specified value, it shall be replaced. When replacing the vibration damping plate, the material and technical performance of the vibration damping plate shall be the same as the original one.
When there are rust spots on the surface of the vibration damping plate, it is allowed to continue to be used after polishing.
3.1.12 Sliding bearings wwW.bzxz.Net
3.1.12.1 The radial clearance of the sliding bearing (see Figure 7) shall not exceed the limit clearance specified in the supercharger manual or 1.5 times the upper limit of the new assembly. If it exceeds the regulations, it shall be repaired or replaced.
3.1.12.2 The sliding surface roughness of the sliding bearing Ra<0.8μmc3.1.12.3 The lower part of the sliding bearing shall be in uniform contact with the journal, and its contact angle 0 shall be within the range of 45°～.90°, and the axial contact length shall not be less than 80% of the total length. If the above requirements are not met, repairs are allowed, but the radial clearance after repair shall comply with the provisions of Article 3.1.12.1.
3.1.12.4 The alloy layer of the sliding bearing shall not have defects such as cracks, peeling, melting, severe corrosion, shelling, etc. If the above defects exist, it shall be repaired or replaced. 1931 When the sum of the wear depth of the inner hole surface of the axial-flow turbine impeller cover and the wear amount of the top of the turbine blade does not exceed 1% of the effective length of the turbine blade, it is allowed to be used after finishing. When it exceeds the above provisions, the wear of the blades and the cover should be considered. If the increase in the gap is mainly caused by the wear of the cover, the impeller cover must be replaced.
3.1.8.2 After the axial-flow turbine impeller cover is deformed, the maximum gap between the impeller and the cover shall not exceed the provisions of Article 3.1.2.10. Grinding is allowed when the inner diameter of the cover is less than the lower limit of the original size.
3.1.8.3 When the wear depth of the radial-flow turbine impeller shell (including the turbine impeller shell integrated with the turbine housing) is within 0.20mm and the area is not greater than 25% of the total surface area, it is allowed to be repaired and used. 3.1.8.4 After the radial turbine impeller casing is deformed, the maximum clearance between the casing and the impeller shall not exceed the provisions of Article 3.1.4.3. When the profile size is less than the lower limit of the original size, grinding is allowed.
3.1.9 Compressor impeller casing
3.1.9.1 When the sum of the profile wear depth of the compressor impeller casing and the impeller rim wear does not exceed 50% of its new assembly clearance and its area does not exceed 25% of the total profile area, it is allowed to be used after smoothing. 3.1.9.2 After the profile of the compressor impeller casing is deformed, the maximum clearance between the casing and the impeller shall not exceed the limit clearance specified in the manual of the supercharger or 1.5 times the new assembly clearance. When the profile size is less than the lower limit of the original size, repair is allowed. 3.1.10 Shell
3.1.10.1 After the supercharger shell is corroded, its minimum wall thickness shall not be less than 50% of the designed wall thickness. If the cooling water chamber of the shell passes the water pressure test of 1.5 times the working pressure (but not less than 0.4MPa), it is allowed to continue to be used. 3.1.10.2 If the local minimum wall thickness of the supercharger turbine shell exceeds the provisions of 3.1.10.1 or is damaged, it is allowed to be repaired by welding or repaired with heat-resistant adhesive. The repaired shell must be subjected to the water pressure test according to the test pressure specified in 3.1.10.1. It can only be used after passing the test.
3.1.10.3. When cracks appear on the supercharger turbine shell, welding is allowed. After welding, the color penetration method should be used to check whether there are cracks at the weld, and a 0.4MPa water pressure test should be carried out. No leakage is allowed.
3.1.10.44
For defects such as cracks and corrosion on compressor casings made of lead alloy, argon arc welding is allowed to be used for repair. After welding, dye penetrant inspection should be carried out.
3.1.10.5When the remaining volume of the anti-corrosion zinc block in the casing cooling water cavity is less than 1/2 of the original volume, it should be replaced.
Rolling bearings
CB / T 3563-93
3.1.11.1:
When the cumulative working time of rolling bearings reaches their rated service life, new bearings should be replaced.
3.1.11.2 Rolling bearings should rotate flexibly, without abnormal noise and overheating. The bearing parts should be free of defects such as damage, corrosion, cracks, loose cages, etc. 3.1.11.3When replacing rolling bearings, the model and accuracy grade specified in the technical documents should be used. Generally, bearings with accuracy not lower than D grade should be used. 3.1.11.4 The elasticity of the vibration damping plate of the rolling bearing shall be uniform and good, without defects such as biting, excessive wear and fracture. If the above defects occur or the clearance exceeds the specified value, it shall be replaced. When replacing the vibration damping plate, the material and technical performance of the vibration damping plate shall be the same as the original one.
When there are rust spots on the surface of the vibration damping plate, it is allowed to continue to be used after polishing.
3.1.12 Sliding bearings
3.1.12.1 The radial clearance of the sliding bearing (see Figure 7) shall not exceed the limit clearance specified in the supercharger manual or 1.5 times the upper limit of the new assembly. If it exceeds the regulations, it shall be repaired or replaced.
3.1.12.2 The sliding surface roughness of the sliding bearing Ra<0.8μmc3.1.12.3 The lower part of the sliding bearing shall be in uniform contact with the journal, and its contact angle 0 shall be within the range of 45°～.90°, and the axial contact length shall not be less than 80% of the total length. If the above requirements are not met, repairs are allowed, but the radial clearance after repair shall comply with the provisions of Article 3.1.12.1.
3.1.12.4 The alloy layer of the sliding bearing shall not have defects such as cracks, peeling, melting, severe corrosion, shelling, etc. If the above defects exist, it shall be repaired or replaced. 193
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