CN113913808A - Laser repairing method for marine diesel engine crankshaft - Google Patents
Laser repairing method for marine diesel engine crankshaft Download PDFInfo
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- CN113913808A CN113913808A CN202010662921.XA CN202010662921A CN113913808A CN 113913808 A CN113913808 A CN 113913808A CN 202010662921 A CN202010662921 A CN 202010662921A CN 113913808 A CN113913808 A CN 113913808A
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- Prior art keywords
- diesel engine
- crankshaft
- laser
- marine diesel
- cladding
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
Abstract
The invention relates to a laser repairing method for a marine diesel engine crankshaft, which is implemented by high-energy laser beams (10)4~105W/cm2) Heating the metal surface, rapidly heating and melting the surface of the matrix and the added alloy powder under the action of heat to form a metallurgical bonding surface cladding layer with extremely low dilution rate, repairing the marine diesel engine crankshaft by adopting a laser cladding process and the alloy powder, and reducing the residual magnetism because the interface after cladding welding is not easy to gather magnetism and the alloy powder with specific combination is adopted; and due to rapid heating and rapid cooling of the laser, heat input, heat affected zone andthe distortion is small, the deformation of the crankshaft of the marine diesel engine can be avoided, the dilution rate of the cladding layer is less than 5 percent, the cladding layer is in firm metallurgical combination with the matrix, and a good cladding layer with controllable cladding layer components and dilution can be obtained; the wear resistance of the marine diesel engine crankshaft is greatly improved.
Description
Technical Field
The invention relates to the technical field of laser welding processes, in particular to a laser repairing method for a marine diesel engine crankshaft.
Background
The wear of the marine crankshaft has a great safety influence on the normal operation of the diesel engine, which requires the crankshaft and the bearing bush to have higher wear resistance to improve the service life. In the matching design of the crankshaft and the bearing bush, the crankshaft is preferably protected from being abraded due to the easy replacement of the bearing bush and the higher difficulty in repairing the crankshaft. Various alloy powder materials used in the laser cladding process belong to self-melting alloys, and are different from the magnetic permeability of a crankshaft body material, so that the phenomenon of magnetism accumulation in MT magnetic powder inspection in a laser cladding layer and body combination area can be generated, and the laser cladding cannot pass ship inspection. The technical problem to be solved by technical personnel in the field is to find an alloy component formula meeting the crankshaft cladding by updating the formula of the laser cladding alloy material.
Disclosure of Invention
The invention aims to solve the technical problem of providing a laser repairing method for a marine diesel engine crankshaft, which can avoid deformation and has a cladding layer dilution rate of less than 5%.
In order to solve the technical problem, the laser repairing method for the crankshaft of the marine diesel engine, provided by the invention, comprises the following steps:
A. cleaning and detecting the size of the crankshaft of the marine diesel engine, and determining the abrasion part and the abrasion loss of the crankshaft of the marine diesel engine; according to the detection result, removing an extrusion wear fatigue layer and a corrosion fatigue layer at the worn part of the crankshaft of the marine diesel engine, and detecting the hardness of the unworn part;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. removing oil stains and water vapor on the surface of a crankshaft of the marine diesel engine, and clamping the crankshaft on a special machine tool;
D. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: less than or equal to 0.15 percent, Cr: 16.5 to 18.5%, Si: 1.0% to 2.0%, Mo: 0.15% to 0.25%, B: 0.15 to 0.25 percent, and the balance of Fe;
E. adopting a warehouse-card robot to match with a fiber laser to carry out continuous scanning, setting cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 25-35 g/min, and carrying out cladding on the surface of the worn part of the crankshaft of the marine diesel engine;
F. a vent pipe is arranged on one side of the laser molten pool and used for introducing inert gas into the cooled laser molten pool for cooling;
G. measuring the size of the cooled laser deposited part, then carrying out grinding processing, and carrying out PT and MT magnetic powder inspection again to ensure that the size and the surface quality of the crankshaft of the marine diesel engine meet the requirements; and detecting the hardness of the laser welding part to ensure that the hardness of the crankshaft of the marine diesel engine after laser welding meets the requirement.
Further, in the step E, the laser power of the optical fiber laser is 1600W to 2100W, and the elevation is 300mm to 325 mm.
Further, in the step E, the spot size of the optical fiber laser is 4mm multiplied by 4mm, the scanning speed is 600mm/min to 1000mm/min, and the lap joint amount is 2 mm.
Further, the inert gas in the step F is argon.
The invention has the technical effects that: compared with the prior art, the laser repairing method for the crankshaft of the marine diesel engine adopts high-energy laser beams (10)4~105W/cm2) Heating the metal surface, rapidly heating and melting the surface of the matrix and the added alloy powder under the action of heat to form a metallurgical bonding surface cladding layer with extremely low dilution rate, repairing the marine diesel engine crankshaft by adopting a laser cladding process and the alloy powder, and reducing the residual magnetism because the interface after cladding welding is not easy to gather magnetism and the alloy powder with specific combination is adopted; and because of the rapid heating and rapid cooling of the laser, the heat input, the heat affected zone and the distortion are small, the deformation of the marine diesel engine crankshaft can be avoided, the dilution rate of the cladding layer is less than 5 percent, the cladding layer is in firm metallurgical combination with the substrate, and a good cladding layer with controllable cladding layer components and dilution can be obtained; the wear resistance of the marine diesel engine crankshaft is greatly improved; (2) PT is adopted for flaw detection before and after welding, defects are judged, and the qualification rate of product repair is improved.
Detailed Description
Example 1
A laser repairing method for a marine diesel engine crankshaft comprises the following steps:
A. cleaning and detecting the size of the crankshaft of the marine diesel engine, and determining the abrasion part and the abrasion loss of the crankshaft of the marine diesel engine; according to the detection result, removing a wear fatigue layer and a corrosion fatigue layer of the wear part of the crankshaft of the marine diesel engine; and detecting the hardness of the unworn part;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. removing oil stains and water vapor on the surface of a crankshaft of the marine diesel engine, and clamping the crankshaft on a special machine tool;
D. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.13%, Cr: 18.5%, Si: 2.0%, Mo: 0.24%, B: 0.23 percent, and the balance of Fe;
E. adopting a warehouse-card robot to cooperate with a fiber laser to carry out continuous scanning, setting cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 25g/min, cladding 3 layers on the surface of the worn part of the crankshaft of the marine diesel engine, and the thickness of an alloy cladding layer is 0.4-0.55 mm; the laser power of the fiber laser is 1800W, the elevation is 315mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 800mm/min, and the lap joint quantity is 2 mm;
F. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
G. measuring the size of the cooled laser deposited part, then carrying out grinding processing, and carrying out PT and MT magnetic powder inspection again to ensure that the size and the surface quality of the crankshaft of the marine diesel engine meet the requirements; and detecting the hardness of the laser welding part to ensure that the hardness of the crankshaft of the marine diesel engine after laser welding meets the requirement.
And (3) carrying out residual magnetism inspection on the joint of the laser cladding layer and the marine diesel engine crankshaft body, and displaying that the residual magnetism accords with a marine inspection standard by an obtained result.
Example 2
A laser repairing method for a marine diesel engine crankshaft comprises the following steps:
A. cleaning and detecting the size of the crankshaft of the marine diesel engine, and determining the abrasion part and the abrasion loss of the crankshaft of the marine diesel engine; according to the detection result, removing a wear fatigue layer and a corrosion fatigue layer of the wear part of the crankshaft of the marine diesel engine; and detecting the hardness of the unworn part;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. removing oil stains and water vapor on the surface of a crankshaft of the marine diesel engine, and clamping the crankshaft on a special machine tool;
D. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.05%, Cr: 16.7%, Si: 1.0%, Mo: 0.16%, B: 0.17% and the balance Fe;
E. adopting a warehouse-card robot to cooperate with a fiber laser to carry out continuous scanning, setting cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 30g/min, cladding 3 layers on the surface of the worn part of the crankshaft of the marine diesel engine, and the thickness of an alloy cladding layer is 0.45-0.60 mm; the laser power of the fiber laser is 1800W, the elevation is 315mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 900mm/min, and the lap joint quantity is 2 mm;
F. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
G. measuring the size of the cooled laser deposited part, then carrying out grinding processing, and carrying out PT and MT magnetic powder inspection again to ensure that the size and the surface quality of the crankshaft of the marine diesel engine meet the requirements; and detecting the hardness of the laser welding part to ensure that the hardness of the crankshaft of the marine diesel engine after laser welding meets the requirement.
And (3) carrying out residual magnetism inspection on the joint of the laser cladding layer and the marine diesel engine crankshaft body, and displaying that the residual magnetism accords with a marine inspection standard by an obtained result.
Example 3
A laser repairing method for a marine diesel engine crankshaft comprises the following steps:
A. cleaning and detecting the size of the crankshaft of the marine diesel engine, and determining the abrasion part and the abrasion loss of the crankshaft of the marine diesel engine; according to the detection result, removing a wear fatigue layer and a corrosion fatigue layer of the wear part of the crankshaft of the marine diesel engine; and detecting the hardness of the unworn part;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. removing oil stains and water vapor on the surface of a crankshaft of the marine diesel engine, and clamping the crankshaft on a special machine tool;
D. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.10%, Cr: 17.5%, Si: 1.0%, Mo: 0.20%, B: 0.20 percent, and the balance of Fe;
E. adopting a warehouse-card robot to cooperate with a fiber laser to carry out continuous scanning, setting cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 35g/min, cladding 3 layers on the surface of the worn part of the crankshaft of the marine diesel engine, and the thickness of an alloy cladding layer is 0.50-0.65 mm; the laser power of the fiber laser is 1800W, the elevation is 315mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 1000mm/min, and the lap joint quantity is 2 mm;
F. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
G. measuring the size of the cooled laser deposited part, then carrying out grinding processing, and carrying out PT and MT magnetic powder inspection again to ensure that the size and the surface quality of the crankshaft of the marine diesel engine meet the requirements; and detecting the hardness of the laser welding part to ensure that the hardness of the crankshaft of the marine diesel engine after laser welding meets the requirement.
And (3) carrying out residual magnetism inspection on the joint of the laser cladding layer and the marine diesel engine crankshaft body, and displaying that the residual magnetism accords with a marine inspection standard by an obtained result.
Example 4
A laser repairing method for a marine diesel engine crankshaft comprises the following steps:
A. cleaning and detecting the size of the crankshaft of the marine diesel engine, and determining the abrasion part and the abrasion loss of the crankshaft of the marine diesel engine; according to the detection result, removing a wear fatigue layer and a corrosion fatigue layer of the wear part of the crankshaft of the marine diesel engine; and detecting the hardness of the unworn part;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. removing oil stains and water vapor on the surface of a crankshaft of the marine diesel engine, and clamping the crankshaft on a special machine tool;
D. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: 0.06%, Cr: 18.0%, Si: 1.5%, Mo: 0.18%, B: 0.19 percent, and the balance of Fe;
E. adopting a warehouse-card robot to match with a fiber laser to carry out continuous scanning, setting cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 32g/min, cladding 3 layers on the surface of the worn part of the crankshaft of the marine diesel engine, and the thickness of an alloy cladding layer is 0.45-0.60 mm; the laser power of the fiber laser is 1800W, the elevation is 315mm, the spot size of the fiber laser is 4mm multiplied by 4mm, the scanning speed is 700mm/min, and the lap joint quantity is 2 mm;
F. a vent pipe is arranged on one side of the laser molten pool and used for introducing argon into the laser molten pool in cooling for cooling;
G. measuring the size of the cooled laser deposited part, then carrying out grinding processing, and carrying out PT and MT magnetic powder inspection again to ensure that the size and the surface quality of the crankshaft of the marine diesel engine meet the requirements; and detecting the hardness of the laser welding part to ensure that the hardness of the crankshaft of the marine diesel engine after laser welding meets the requirement.
And (3) carrying out residual magnetism inspection on the joint of the laser cladding layer and the marine diesel engine crankshaft body, and displaying that the residual magnetism accords with a marine inspection standard by an obtained result.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.
Claims (4)
1. A laser repairing method for a marine diesel engine crankshaft is characterized by comprising the following steps:
A. cleaning and detecting the size of the crankshaft of the marine diesel engine, and determining the abrasion part and the abrasion loss of the crankshaft of the marine diesel engine; according to the detection result, removing an extrusion wear fatigue layer and a corrosion fatigue layer at the worn part of the crankshaft of the marine diesel engine, and detecting the hardness of the unworn part;
B. detecting the worn part with the worn fatigue layer and the corroded fatigue layer removed by adopting PT flaw detection to ensure that the worn part has no surface defect and internal defect;
C. removing oil stains and water vapor on the surface of a crankshaft of the marine diesel engine, and clamping the crankshaft on a special machine tool;
D. mixing the alloy powder prepared in proportion, and adding the mixed alloy powder into a powder conveying system; the adopted alloy powder comprises the following components in percentage by weight: less than or equal to 0.15 percent, Cr: 16.5 to 18.5%, Si: 1.0% to 2.0%, Mo: 0.15% to 0.25%, B: 0.15 to 0.25 percent, and the balance of Fe;
E. adopting a warehouse-card robot to match with a fiber laser to carry out continuous scanning, setting cladding process parameters of the fiber laser, carrying out laser cladding on the surface to be repaired by adopting a pneumatic coaxial powder feeding method, wherein the powder feeding speed is 25-35 g/min, and carrying out cladding on the surface of the worn part of the crankshaft of the marine diesel engine;
F. a vent pipe is arranged on one side of the laser molten pool and used for introducing inert gas into the cooled laser molten pool for cooling;
G. measuring the size of the cooled laser deposited part, then carrying out grinding processing, and carrying out PT and MT magnetic powder inspection again to ensure that the size and the surface quality of the crankshaft of the marine diesel engine meet the requirements; and detecting the hardness of the laser welding part to ensure that the hardness of the crankshaft of the marine diesel engine after laser welding meets the requirement.
2. The laser repairing method for the crankshaft of the marine diesel engine according to claim 1, wherein in the step E, the laser power of the fiber laser is 1600W to 2100W, and the elevation is 300mm to 325 mm.
3. The laser repairing method for the marine diesel engine crankshaft according to claim 2, wherein in the step E, the spot size of the optical fiber laser is 4mm x 4mm, the scanning speed is 600mm/min to 1000mm/min, and the lap joint amount is 2 mm.
4. The laser repairing method for the crankshaft of the marine diesel engine according to claim 3, wherein the inert gas in the step F is argon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010662921.XA CN113913808A (en) | 2020-07-10 | 2020-07-10 | Laser repairing method for marine diesel engine crankshaft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010662921.XA CN113913808A (en) | 2020-07-10 | 2020-07-10 | Laser repairing method for marine diesel engine crankshaft |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677049A (en) * | 2012-05-27 | 2012-09-19 | 丹阳市宏图机械制造有限公司 | Laser restoring process for surface of high carbon alloy roller |
| WO2014025244A1 (en) * | 2012-08-07 | 2014-02-13 | Torims Toms | Apparatus and method for repair and renovation of crankshaft journal surfaces in-situ by means of laser cladding |
| CN105543838A (en) * | 2015-12-25 | 2016-05-04 | 燕山大学 | Remanufacturing method for marine crankshaft |
| CN109371396A (en) * | 2018-12-27 | 2019-02-22 | 安徽工业大学 | A kind of big thickness cold roll laser restorative procedure of high-carbon stiff dough flawless |
-
2020
- 2020-07-10 CN CN202010662921.XA patent/CN113913808A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677049A (en) * | 2012-05-27 | 2012-09-19 | 丹阳市宏图机械制造有限公司 | Laser restoring process for surface of high carbon alloy roller |
| WO2014025244A1 (en) * | 2012-08-07 | 2014-02-13 | Torims Toms | Apparatus and method for repair and renovation of crankshaft journal surfaces in-situ by means of laser cladding |
| CN105543838A (en) * | 2015-12-25 | 2016-05-04 | 燕山大学 | Remanufacturing method for marine crankshaft |
| CN109371396A (en) * | 2018-12-27 | 2019-02-22 | 安徽工业大学 | A kind of big thickness cold roll laser restorative procedure of high-carbon stiff dough flawless |
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