CN117431538A - Laser cladding repair method for damage of contact surface of precision aluminum alloy piston - Google Patents
Laser cladding repair method for damage of contact surface of precision aluminum alloy piston Download PDFInfo
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- CN117431538A CN117431538A CN202311429648.6A CN202311429648A CN117431538A CN 117431538 A CN117431538 A CN 117431538A CN 202311429648 A CN202311429648 A CN 202311429648A CN 117431538 A CN117431538 A CN 117431538A
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- 238000004372 laser cladding Methods 0.000 title claims abstract description 40
- 230000008439 repair process Effects 0.000 title claims abstract description 40
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 21
- 238000005253 cladding Methods 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 230000003749 cleanliness Effects 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000005488 sandblasting Methods 0.000 claims abstract description 4
- 238000005468 ion implantation Methods 0.000 claims description 36
- 239000007789 gas Substances 0.000 claims description 19
- 230000007797 corrosion Effects 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 238000010884 ion-beam technique Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 229910001430 chromium ion Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000001307 helium Substances 0.000 claims description 8
- 229910052734 helium Inorganic materials 0.000 claims description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 229910003407 AlSi10Mg Inorganic materials 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 238000013021 overheating Methods 0.000 claims description 6
- 238000005461 lubrication Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- UDWPONKAYSRBTJ-UHFFFAOYSA-N [He].[N] Chemical compound [He].[N] UDWPONKAYSRBTJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 3
- 239000012159 carrier gas Substances 0.000 claims description 3
- 238000005524 ceramic coating Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000009713 electroplating Methods 0.000 claims description 3
- 230000005496 eutectics Effects 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000008642 heat stress Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000004544 sputter deposition Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000005204 segregation Methods 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- C23C24/106—Coating with metal alloys or metal elements only
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/48—Ion implantation
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a laser cladding repair method for damage of a contact surface of a precision aluminum alloy piston, which specifically comprises the following steps: step one: carrying out surface deplating treatment on the piston; step two: cleaning the surface of the piston to ensure the cleanliness; step three: covering and protecting the non-repairing area of the piston; step four: performing sand blasting treatment on the area to be repaired of the piston; step five: polishing the area to be repaired to remove the oxide layer; step six: marking the repairing position of the piston, and measuring and recording; in the invention, the aluminum alloy has better plasticity, the equiaxed crystal area generated by laser cladding can improve the mechanical property, and the three cladding layers formed by the method are of columnar crystal-equiaxed crystal-columnar crystal structures, and have the characteristics of high density, high strength and less segregation; compared with the prior method, the air holes are greatly reduced, larger air holes with larger sizes exist originally, and after the improvement of powder gas feeding and shielding gas, only a small amount of small air holes exist in the laser cladding layer.
Description
Technical Field
The invention belongs to the technical field of laser cladding repair, and particularly relates to a laser cladding repair method for damage of a contact surface of a precision aluminum alloy piston.
Background
An internal combustion engine piston of an aeroengine is an important part capable of converting gas pressure into mechanical energy, and is manufactured into a circular state by adopting a casting or powder metallurgy mode so as to bear high-speed gas impact force. The maximum stress position of the piston is the position of the maximum diameter profile surface, and when the part is damaged, the piston is unstable in the working state, so that the normal function is lost. The aviation internal combustion engine piston is a precise part, the manufacturing cost is high, the large economic loss is brought by replacement after damage, and the laser cladding is used as an additive manufacturing means, so that the aviation internal combustion engine piston has the advantages of high precision, small heat output, difficult large deformation and the like, and provides possibility for repairing the damaged part of the piston.
However, because the aluminum alloy has poor laser cladding property and weldability, the laser energy absorption rate is low when the conventional repair is adopted, the surface of the aluminum alloy is easy to oxidize, the gas escapes slowly, so that more pores are generated in the cladding layer, and the service life of the part is seriously influenced; for the reasons mentioned above, it is needed to invent a laser cladding repair method for damage of the profile surface of a precision aluminum alloy piston, which is used for reducing the porosity and improving the service performance.
Disclosure of Invention
The invention aims to provide a laser cladding repair method for damage of a contact surface of a precision aluminum alloy piston, which aims to solve the problems that the aluminum alloy provided in the background art is poor in laser cladding property and weldability and has more air holes.
In order to achieve the above purpose, the present invention provides the following technical solutions: a laser cladding repair method for damage of a contact surface of a precision aluminum alloy piston specifically comprises the following steps:
step one: carrying out surface deplating treatment on the piston;
step two: cleaning the surface of the piston to ensure the cleanliness;
step three: covering and protecting the non-repairing area of the piston;
step four: performing sand blasting treatment on the area to be repaired of the piston;
step five: polishing the area to be repaired to remove the oxide layer;
step six: marking the repairing position of the piston, measuring and recording, and determining the cladding repairing thickness;
step seven: placing the piston on a workbench, and carrying out laser cladding on the end face of the contour of the piston for a plurality of times until the cladding layer is completely clad;
step eight: finish machining is carried out on the repaired part, and redundant additive is removed;
step nine: and (5) after passing the fluorescence and nondestructive detection, electroplating the surface of the aluminum alloy piston to finish the finished product.
In the first step, the surface deplating treatment of the piston comprises the following steps:
i, placing a piston in ion implantation equipment, guiding an ion beam to the surface of the piston through an accelerator, and enabling the ion beam to penetrate the surface of the piston and be embedded into a material to change the physical and chemical properties of the piston;
II, post-treatment: after ion implantation is completed, the piston is subjected to heat treatment, so that the performance of the piston is stabilized and optimized.
As a preferred embodiment of the present invention, the ion beam species implanted include:
a. carbon ion implantation: the hardness and the wear resistance of the surface of the piston are increased, and the lubrication characteristic and the corrosion resistance are improved; the energy range of carbon ion implantation is 20-100 keV;
b. oxygen ion implantation: the corrosion resistance and the thermal stability of the surface of the piston are improved, and the energy range of oxygen ion implantation is 10-50 keV;
c. chromium ion implantation: the hardness, the wear resistance and the corrosion resistance of the surface of the piston are improved, and the energy range of chromium ion implantation is 100-300 keV.
In the third step, the coverage protection of the non-repaired area of the piston includes the following two methods:
(1) mask protection: before laser cladding repair is performed, polyimide or ceramic coating is used for covering a non-repair area of the piston, so that damage to the non-repair area caused by sputtering and thermal influence in the laser cladding process is prevented.
(2) And (3) cooling: during the laser cladding repair process, cooling argon is used to maintain the temperature of the non-repaired area of the piston within an acceptable range, preventing overheating and deformation of the non-repaired area.
As a preferable technical scheme in the invention, the laser cladding advancing track in the step seven is changed from serpentine reciprocation to single-channel repetition, so that the heat input quantity is controlled, and the deformation of the part caused by heat stress accumulation is avoided.
In the seventh step, cast aluminum alloy AlSi10Mg powder with the particle size of 53-150 mu m is used for replacing a matrix material for cladding repair; the structure of the molten pool is essentially an as-cast structure.
As a preferred technical scheme in the invention, the operation steps in the step seven are as follows:
s1, moving a processing head to the position above a region to be clad, turning on indication red light, and adjusting defocusing amounts of the processing head and a repairing end face;
s2, deflecting the angle of the processing head by 3 degrees to avoid damaging the optical fiber lens by energy reflection;
s3, the robot scanning path is offset in parallel from inside to outside, the offset is 0.7mm, and 3 paths are scanned altogether; wherein the laser power is 800w, the scanning speed is 8mm/s, the light spot diameter is 1.8mm, the powder feeding is 2g/min, the powder feeding carrier gas amount is 5L/min, and the protection gas amount is 15L/min;
s4, raising the Z axis of the machining head by 0.2mm after the cladding of one layer is finished, preventing overheating and replacing the stainless steel sheet, and carrying out cladding of the next layer; and 3 layers are eutectic-coated, and each layer is 0.22mm thick.
In the preferred technical scheme of the invention, in the step S3, the ratio of the powder feeding air flow to the protection air flow is 1:3, the powder feeding air is changed from 5L/min helium to 5L/min nitrogen, and the protection air is changed from 15L/min argon to 15L/min helium, so that helium-nitrogen mixed gas is formed, the extrusion of oxygen is realized, and the heat conduction rate and the cooling rate are improved.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the aluminum alloy has better plasticity, so that the equiaxed crystal region generated by laser cladding can improve the mechanical property, and the three-layer cladding layer formed by the method is of a columnar crystal-equiaxed crystal-columnar crystal structure, and has the characteristics of high density, high strength and less segregation; compared with the prior art, the method has the advantages that the air holes are greatly reduced, larger air holes with larger sizes exist originally, and only a small amount of small air holes exist in the laser cladding layer after the improvement of powder feeding gas and shielding gas; therefore, the design of the invention proves that the laser cladding process can repair the piston damaged by the impact of the fuel gas, prolong the service life of the piston, improve the repair technology of the aluminum alloy piston, save the use cost of the piston parts of the engine, and can be applied and popularized to repair other similar aluminum alloy parts.
Drawings
FIG. 1 is a schematic diagram of the steps of the present invention;
FIG. 2 is a schematic diagram of sample pores when the powder gas is 5L/min helium and the shielding gas is 15L/min argon;
FIG. 3 is a schematic diagram of the sample pores when the powder gas is fed with 5L/min nitrogen and the shielding gas is fed with 15L/min helium.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 to 3, the present invention provides a technical solution: a laser cladding repair method for damage of a contact surface of a precision aluminum alloy piston specifically comprises the following steps:
step one: carrying out surface deplating treatment on the piston;
step two: cleaning the surface of the piston to ensure the cleanliness;
step three: covering and protecting the non-repairing area of the piston;
step four: performing sand blasting treatment on the area to be repaired of the piston;
step five: polishing the area to be repaired to remove the oxide layer;
step six: marking the repairing position of the piston, measuring and recording, and determining the cladding repairing thickness;
step seven: placing the piston on a workbench, and carrying out laser cladding on the end face of the contour of the piston for a plurality of times until the cladding layer is completely clad;
step eight: finish machining is carried out on the repaired part, and redundant additive is removed;
step nine: and (5) after passing the fluorescence and nondestructive detection, electroplating the surface of the aluminum alloy piston to finish the finished product.
In this embodiment, in the first step, the surface deplating treatment of the piston is as follows:
i, placing a piston in ion implantation equipment, guiding an ion beam to the surface of the piston through an accelerator, and enabling the ion beam to penetrate the surface of the piston and be embedded into a material to change the physical and chemical properties of the piston;
II, post-treatment: after ion implantation is completed, the piston is subjected to heat treatment, so that the performance of the piston is stabilized and optimized.
In this embodiment, the ion beam species implanted include:
a. carbon ion implantation: the hardness and the wear resistance of the surface of the piston are increased, and the lubrication characteristic and the corrosion resistance are improved; the energy range of the carbon ion implantation is 20keV;
b. oxygen ion implantation: the corrosion resistance and the thermal stability of the surface of the piston are improved, and the energy of oxygen ion implantation is 10keV;
c. chromium ion implantation: the hardness, the wear resistance and the corrosion resistance of the surface of the piston are improved, and the energy of chromium ion implantation is 100keV.
In the present embodiment, in the third step, the coverage protection of the non-repair area of the piston includes the following two methods:
(1) mask protection: before laser cladding repair is performed, polyimide or ceramic coating is used for covering a non-repair area of the piston, so that damage to the non-repair area caused by sputtering and thermal influence in the laser cladding process is prevented.
(2) And (3) cooling: during the laser cladding repair process, cooling argon is used to maintain the temperature of the non-repaired area of the piston within an acceptable range, preventing overheating and deformation of the non-repaired area.
In the embodiment, the laser cladding advancing track in the step seven is changed from serpentine reciprocation to single-channel repetition, so that the heat input quantity is controlled, and the deformation of the part caused by heat stress accumulation is avoided.
In the embodiment, in the seventh step, cast aluminum alloy AlSi10Mg powder with the particle size of 53 μm is used for replacing a matrix material for cladding repair; the structure of the molten pool is an as-cast structure, and the AlSi10Mg is selected to realize the repair position with higher specific strength, better heat transfer and better casting performance.
In this embodiment, the operation steps in the seventh step are as follows:
s1, moving a processing head to the position above a region to be clad, turning on indication red light, and adjusting defocusing amounts of the processing head and a repairing end face;
s2, deflecting the angle of the processing head by 3 degrees to avoid damaging the optical fiber lens by energy reflection;
s3, the robot scanning path is offset in parallel from inside to outside, the offset is 0.7mm, and 3 paths are scanned altogether; wherein the laser power is 800w, the scanning speed is 8mm/s, the light spot diameter is 1.8mm, the powder feeding is 2g/min, the powder feeding carrier gas amount is 5L/min, and the protection gas amount is 15L/min;
s4, raising the Z axis of the machining head by 0.2mm after the cladding of one layer is finished, preventing overheating and replacing the stainless steel sheet, and carrying out cladding of the next layer; and 3 layers are eutectic-coated, and each layer is 0.22mm thick.
In the embodiment, in S3, the ratio of the flow rate of the powder feeding gas to the flow rate of the protection gas is 1:3, the powder feeding gas is changed from 5L/min helium to 5L/min nitrogen, and the protection gas is changed from 15L/min argon to 15L/min helium, so that helium-nitrogen mixed gas is formed, extrusion oxygen is realized, and the heat conduction rate and the cooling rate are improved, so that oxidation of aluminum alloy is avoided, and the porosity is greatly reduced.
Example 2
The difference from this embodiment 1 is that: in this embodiment, the ion beam species implanted include:
a. carbon ion implantation: the hardness and the wear resistance of the surface of the piston are increased, and the lubrication characteristic and the corrosion resistance are improved; the energy of carbon ion implantation is 80keV;
b. oxygen ion implantation: the corrosion resistance and the thermal stability of the surface of the piston are improved, and the energy of oxygen ion implantation is 30keV;
c. chromium ion implantation: the hardness, the wear resistance and the corrosion resistance of the surface of the piston are improved, and the energy of chromium ion implantation is 200keV.
In the embodiment, in the seventh step, cast aluminum alloy AlSi10Mg powder with the grain diameter of 90 μm is used for replacing the matrix material for cladding repair; the structure of the molten pool is essentially an as-cast structure.
Example 3
The difference from the above embodiment is that: the difference from this embodiment 1 is that: in this embodiment, the ion beam species implanted include:
a. carbon ion implantation: the hardness and the wear resistance of the surface of the piston are increased, and the lubrication characteristic and the corrosion resistance are improved; the energy of carbon ion implantation is 100keV;
b. oxygen ion implantation: the corrosion resistance and the thermal stability of the surface of the piston are improved, and the energy of oxygen ion implantation is 50keV;
c. chromium ion implantation: the hardness, the wear resistance and the corrosion resistance of the surface of the piston are improved, and the energy of chromium ion implantation is 300keV.
In the embodiment, in the seventh step, cast aluminum alloy AlSi10Mg powder with the particle size of 150 μm is used for replacing the matrix material for cladding repair; the structure of the molten pool is essentially an as-cast structure.
Although embodiments of the present invention have been shown and described in detail with reference to the foregoing detailed description, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A laser cladding repair method for damage of a contact surface of a precision aluminum alloy piston is characterized by comprising the following steps: the method specifically comprises the following steps:
step one: carrying out surface deplating treatment on the piston;
step two: cleaning the surface of the piston to ensure the cleanliness;
step three: covering and protecting the non-repairing area of the piston;
step four: performing sand blasting treatment on the area to be repaired of the piston;
step five: polishing the area to be repaired to remove the oxide layer;
step six: marking the repairing position of the piston, measuring and recording, and determining the cladding repairing thickness;
step seven: placing the piston on a workbench, and carrying out laser cladding on the end face of the contour of the piston for a plurality of times until the cladding layer is completely clad;
step eight: finish machining is carried out on the repaired part, and redundant additive is removed;
step nine: and (5) after passing the fluorescence and nondestructive detection, electroplating the surface of the aluminum alloy piston to finish the finished product.
2. The laser cladding repair method for damage to the contact surface of a precision aluminum alloy piston according to claim 1, which is characterized in that: in the first step, the surface deplating treatment of the piston comprises the following steps:
i, placing a piston in ion implantation equipment, guiding an ion beam to the surface of the piston through an accelerator, and enabling the ion beam to penetrate the surface of the piston and be embedded into a material to change the physical and chemical properties of the piston;
II, post-treatment: after ion implantation is completed, the piston is subjected to heat treatment, so that the performance of the piston is stabilized and optimized.
3. The laser cladding repair method for the damage of the contact surface of the precision aluminum alloy piston according to claim 2, which is characterized in that: the ion beam species implanted include:
a. carbon ion implantation: the hardness and the wear resistance of the surface of the piston are increased, and the lubrication characteristic and the corrosion resistance are improved; the energy range of carbon ion implantation is 20-100 keV;
b. oxygen ion implantation: the corrosion resistance and the thermal stability of the surface of the piston are improved, and the energy range of oxygen ion implantation is 10-50 keV;
c. chromium ion implantation: the hardness, the wear resistance and the corrosion resistance of the surface of the piston are improved, and the energy range of chromium ion implantation is 100-300 keV.
4. The laser cladding repair method for damage to the contact surface of a precision aluminum alloy piston according to claim 1, which is characterized in that: in the third step, the coverage protection of the non-repairing area of the piston comprises the following two modes:
(1) mask protection: before laser cladding repair is performed, polyimide or ceramic coating is used for covering a non-repair area of the piston, so that damage to the non-repair area caused by sputtering and thermal influence in the laser cladding process is prevented.
(2) And (3) cooling: during the laser cladding repair process, cooling argon is used to maintain the temperature of the non-repaired area of the piston within an acceptable range, preventing overheating and deformation of the non-repaired area.
5. The laser cladding repair method for damage to the contact surface of a precision aluminum alloy piston according to claim 1, which is characterized in that: and in the step seven, the laser cladding advancing track is changed from serpentine reciprocation to single-channel repetition, so that the heat input quantity is controlled, and the deformation of the part caused by heat stress accumulation is avoided.
6. The laser cladding repair method for damage to the contact surface of a precision aluminum alloy piston according to claim 1, which is characterized in that: in the seventh step, cast aluminum alloy AlSi10Mg powder with the particle size of 53-150 mu m is used for replacing a matrix material to carry out cladding repair; the structure of the molten pool is essentially an as-cast structure.
7. The laser cladding repair method for damage to the contact surface of a precision aluminum alloy piston according to claim 1, which is characterized in that: the operation steps in the step seven are as follows:
s1, moving a processing head to the position above a region to be clad, turning on indication red light, and adjusting defocusing amounts of the processing head and a repairing end face;
s2, deflecting the angle of the processing head by 3 degrees to avoid damaging the optical fiber lens by energy reflection;
s3, the robot scanning path is offset in parallel from inside to outside, the offset is 0.7mm, and 3 paths are scanned altogether; wherein the laser power is 800w, the scanning speed is 8mm/s, the light spot diameter is 1.8mm, the powder feeding is 2g/min, the powder feeding carrier gas amount is 5L/min, and the protection gas amount is 15L/min;
s4, raising the Z axis of the machining head by 0.2mm after the cladding of one layer is finished, preventing overheating and replacing the stainless steel sheet, and carrying out cladding of the next layer; and 3 layers are eutectic-coated, and each layer is 0.22mm thick.
8. The laser cladding repair method for damage to the contact surface of the precision aluminum alloy piston as claimed in claim 7, wherein the method comprises the following steps: in the step S3, the ratio of the powder feeding air flow to the protection air flow is 1:3, the powder feeding air is changed from 5L/min helium to 5L/min nitrogen, and the protection air is changed from 15L/min argon to 15L/min helium, so that helium-nitrogen mixed gas is formed, extrusion oxygen is realized, and the heat conduction rate and the cooling rate are improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311429648.6A CN117431538A (en) | 2023-10-31 | 2023-10-31 | Laser cladding repair method for damage of contact surface of precision aluminum alloy piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311429648.6A CN117431538A (en) | 2023-10-31 | 2023-10-31 | Laser cladding repair method for damage of contact surface of precision aluminum alloy piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117431538A true CN117431538A (en) | 2024-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311429648.6A Pending CN117431538A (en) | 2023-10-31 | 2023-10-31 | Laser cladding repair method for damage of contact surface of precision aluminum alloy piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117431538A (en) |
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2023
- 2023-10-31 CN CN202311429648.6A patent/CN117431538A/en active Pending
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