CN112746272A - Engine cylinder sleeve strengthening method - Google Patents
Engine cylinder sleeve strengthening method Download PDFInfo
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- CN112746272A CN112746272A CN202011576464.9A CN202011576464A CN112746272A CN 112746272 A CN112746272 A CN 112746272A CN 202011576464 A CN202011576464 A CN 202011576464A CN 112746272 A CN112746272 A CN 112746272A
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- 238000005728 strengthening Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012545 processing Methods 0.000 claims abstract description 35
- 239000000956 alloy Substances 0.000 claims abstract description 32
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 30
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 239000011247 coating layer Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 19
- 238000005275 alloying Methods 0.000 claims abstract description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010955 niobium Substances 0.000 claims abstract description 16
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 12
- 230000005855 radiation Effects 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 239000011651 chromium Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011733 molybdenum Substances 0.000 claims abstract description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012466 permeate Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 7
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 7
- 239000010937 tungsten Substances 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007605 air drying Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 18
- 239000003973 paint Substances 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract description 21
- 238000005260 corrosion Methods 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 14
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000010959 steel Substances 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229910001182 Mo alloy Inorganic materials 0.000 description 2
- 229910003296 Ni-Mo Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000007750 plasma spraying Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Images
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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
Abstract
The invention provides a method for strengthening an engine cylinder sleeve, which belongs to the field of preparation of engine components and specifically comprises the steps of cleaning the inner wall of the cylinder sleeve; uniformly spraying a prepared alloying coating on the surface of the inner wall of the cylinder sleeve to be reinforced, and air-drying a coating layer, wherein the alloying coating comprises 10-30% of alloy powder, 30-70% of alcohol and 5-15% of a binder, and the alloy powder is nickel, chromium, tungsten, molybdenum, vanadium and niobium; and performing radiation scanning on the surface of the sprayed inner wall of the cylinder sleeve by using laser, so that alloy elements in the coating layer permeate into the inner wall of the cylinder sleeve, wherein the processing power of the laser is 4000-. Through the treatment scheme of this application, show the corrosion resisting property who promotes methyl alcohol engine cylinder liner.
Description
Technical Field
The invention relates to the field of engine component preparation, in particular to a method for strengthening an engine cylinder sleeve.
Background
Methanol is more and more regarded as an automobile alternative fuel with a good application prospect, but the wide application of a methanol engine has a plurality of problems, in the actual working condition, the abrasion speed of a cylinder sleeve of the methanol engine is 20 times of that of a common engine, wherein the most important reason is corrosion. Methanol-fuel is highly corrosive to metals in vehicle fuel systems, particularly copper, aluminum, tin, lead, and the like.
Although the corrosion resistance of the cylinder liner can be improved by adopting a metallurgical bonding mode, for example, CN201910456716.5 applied by the public motor company adopts a plasma spraying technology to improve the bonding degree of the coating strengthening layer and the substrate, although the corrosion resistance effect is good, the plasma spraying technology has very high cost and is difficult to apply in batches, and the scheme does not mention the processing speed and efficiency, so a strengthening method for improving the corrosion resistance of the cylinder liner is urgently needed at present.
Disclosure of Invention
Therefore, in order to overcome the defects of the prior art, the invention provides a method for strengthening the engine cylinder liner, which can obviously improve the corrosion resistance of the methanol engine cylinder liner.
In order to achieve the above object, the present invention provides a cylinder liner reinforcement method for an engine, comprising: cleaning the inner wall of the cylinder sleeve; uniformly spraying a prepared alloying coating on the surface of the inner wall of the cylinder sleeve to be reinforced, and air-drying a coating layer, wherein the alloying coating comprises 10-30% of alloy powder, 30-70% of alcohol and 5-15% of a binder, and the alloy powder is nickel, chromium, tungsten, molybdenum, vanadium and niobium; and performing radiation scanning on the surface of the sprayed inner wall of the cylinder sleeve by using laser, so that alloy elements in the coating layer permeate into the inner wall of the cylinder sleeve, wherein the processing power of the laser is 4000-.
In one embodiment, the alloy powder comprises, by mass, 10-18% of nickel, 21-35% of chromium, 16-25% of tungsten, 5-8% of molybdenum, 14-18% of vanadium and 3-7% of niobium.
In one embodiment, the thickness of the paint layer is 0.05-0.5 mm.
In one embodiment, the inner wall of the cylinder sleeve is scanned by using laser spots, wherein the laser spots are circular spots, elliptical spots or square spots, the diameter of the circular spots is 1-3mm, the major axis and the minor axis of the elliptical spots are 1-3mm, and the length and the width of the square spots are 2-5 mm.
In one embodiment, the inner wall of the cylinder sleeve is continuously scanned by using a laser spot, and the processing speed is 9000-.
In one embodiment, the inner wall of the cylinder sleeve is intermittently scanned in a punctiform manner by using laser spots, and the intermittent dwell time is 0.1-0.4 s.
In one embodiment, the surface of the sprayed inner wall of the cylinder sleeve is scanned by adopting a spaced oblique line processing mode, and the included angle between an oblique line and an axial straight line of the inner wall of the cylinder sleeve ranges from 60 degrees to 90 degrees.
In one embodiment, the laser is irradiated on the paint layer in 65-90% of the expected area of the reinforcement.
In one embodiment, the laser irradiates 75-90% of the area of the coating layer to be strengthened.
In one embodiment, a plurality of laser radiation heads are used to simultaneously scan the coating layer.
Compared with the prior art, the invention has the advantages that: the corrosion resistance of the inner wall of the cylinder sleeve can be obviously improved, and high-speed and high-efficiency processing is realized. Moreover, the alloy material adds low-cost metals Ni and Nb, the high-temperature oxidation corrosion resistance of the cylinder sleeve is increased by the Ni-Cr alloy, the strong reducing medium resistance of the cylinder sleeve is increased by the Ni-Mo alloy, and the acid corrosion resistance of the cylinder sleeve is increased by the Ni-Cr-Mo alloy, so that not only is Nb formed into stable NbC or Nb in steel4C3And the steel is distributed on the matrix in a fine dispersion manner, so that the precipitation strengthening effect is achieved, the overheating of the steel can be prevented, and the integral high-temperature stability is improved. The invention can obviously improve the corrosion resistance of the cylinder sleeve of the methanol engine by the targeted design of materials and process, and can realize low costThe method has high efficiency and is suitable for industrial application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of the structure of a cylinder liner in an embodiment of the present invention;
FIG. 2 is a schematic illustration of cylinder liner machining in an embodiment of the present invention; and
fig. 3 is a schematic view of spot processing in an embodiment of the present invention.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that aspects may be practiced without these specific details.
The embodiment of the application provides a method for strengthening an engine cylinder sleeve, which comprises the following steps:
cleaning the inner wall of the cylinder sleeve;
uniformly spraying the prepared alloying coating on the surface of the inner wall of the cylinder sleeve to be reinforced, and air-drying the coating layer, wherein the alloying coating comprises 10-30% of alloy powder, 30-70% of alcohol and 5-15% of binder, and the alloy powder is nickel, chromium, tungsten, molybdenum, vanadium and niobium;
the surface of the sprayed cylinder sleeve inner wall is subjected to radiation scanning by laser, so that a micro-molten pool is generated on the surface of the test piece, alloy elements in the coating layer permeate into the cylinder sleeve inner wall, and the processing power of the laser is 4000-20000W. The surface after laser strengthening obtains a coating strengthening layer with the depth of 0.15-1.0mm, and the hardness reaches HRC50-HRC 65.
As shown in fig. 1, 1 is a cylinder liner, 1.1 is a cylinder liner inner wall, 3 is a laser processing area, and 4 is a processing included angle. The granularity of the alloy powder is not more than 300 meshes. The metals in the alloy powder are mixed uniformly. In one embodiment, the surface of the sprayed cylinder sleeve inner wall is scanned by adopting an interval oblique line processing mode, the included angle between an oblique line and an axial straight line of the cylinder sleeve inner wall ranges from 60 degrees to 90 degrees, and the preferred included angle ranges from 75 degrees. In one embodiment, the inner wall of the cylinder sleeve is continuously scanned by using a laser spot, and the processing speed is 9000-. As shown in fig. 1, the laser welding passes on the paint layer are continuous.
The method for strengthening the engine cylinder sleeve can obviously improve the corrosion resistance of the inner wall of the cylinder sleeve and simultaneously realize high-speed and high-efficiency processing. Moreover, the alloy material adds low-cost metals Ni and Nb, the high-temperature oxidation corrosion resistance of the cylinder sleeve is increased by the Ni-Cr alloy, the strong reducing medium resistance of the cylinder sleeve is increased by the Ni-Mo alloy, and the acid corrosion resistance of the cylinder sleeve is increased by the Ni-Cr-Mo alloy, so that not only is Nb formed into stable NbC or Nb in steel4C3And the steel is distributed on the matrix in a fine dispersion manner, so that the precipitation strengthening effect is achieved, the overheating of the steel can be prevented, and the integral high-temperature stability is improved. The invention can obviously improve the corrosion resistance of the cylinder sleeve of the methanol engine by the targeted design of materials and processes, can realize the processing with low cost and high efficiency, and is suitable for industrialized application.
In one embodiment, the alloy powder comprises, by mass, 10-18% of nickel, 21-35% of chromium, 16-25% of tungsten, 5-8% of molybdenum, 14-18% of vanadium and 3-7% of niobium.
In one embodiment, the thickness of the paint layer is 0.05-0.5 mm.
In one embodiment, the inner wall of the cylinder sleeve is scanned by using a laser spot which is a circular spot, an elliptical spot or a square spot, wherein the diameter of the circular spot is 1-3mm, the major axis and the minor axis of the elliptical spot are 1-3mm, and the length and the width of the square spot are 2-5 mm.
In one embodiment, as shown in FIG. 3, the laser spot is used to intermittently scan the inner wall of the cylinder liner in a spot-like manner, and each intermittent dwell time is 0.1-0.4 s. The laser weld bead on the paint layer is discontinuous.
In one embodiment, the laser is irradiated on the paint layer in 65-90% of the expected area of the reinforcement.
In one embodiment, the laser is irradiated on the paint layer in an area of 75-90% of the area expected for strengthening.
In one embodiment, a plurality of laser radiation heads are used to simultaneously scan the coating layer.
In one embodiment, the engine cylinder liner strengthening method comprises the following steps:
(1) cleaning the inner wall of the cylinder sleeve 1.1: cleaning the inner wall 1.1 of the cylinder sleeve to ensure that the inner wall 1.1 of the cylinder sleeve is free of rust, oil stain and the like;
(2) spraying an alloying coating: the prepared alloying coating is uniformly sprayed on the surface of 1.1 of the inner wall of the cylinder sleeve by a spray gun, and then the coating layer is dried by natural wind or a fan, and the thickness of the coating layer is uniform and reaches 0.05 mm. The alloying coating comprises 15% of alloy powder, 70% of alcohol and 15% of binder by mass, wherein the alloy powder comprises the following components in percentage by mass: ni 14%, Cr 35%, W25%, Mo 5%, V18% and Nb 3%; the specific components of the binder can be PVC and resin with the proportion of 1: 1;
(3) the method comprises the steps of adopting laser spots to carry out continuous radiation scanning on 1.1 of the surface of the sprayed cylinder sleeve inner wall to enable alloy elements in a coating layer to permeate into the cylinder sleeve inner wall, wherein the laser processing power is 4000-. The machining area 3 occupies 65-90%, preferably more than 75%, of the intended area of reinforcement, i.e. the area of radiation of the laser on the coating layer occupies 65-90%, preferably more than 75%, of the intended area of reinforcement. 2 or more processing heads can be adopted to work together in the processing process. The interval between two adjacent oblique lines is 0.5-1 mm. The surface after laser strengthening obtains a coating strengthening layer with the depth of 0.15mm, and the hardness reaches HRC50-HRC 65. The coating strengthening layer is an inner wall layer which comprises a coating layer and a cylinder sleeve and is irradiated by laser.
In another embodiment, a method of strengthening an engine cylinder liner includes the steps of:
(1) cleaning the inner wall of the cylinder sleeve 1.1: cleaning the inner wall 1.1 of the cylinder sleeve to ensure that the inner wall 1.1 of the cylinder sleeve is free of rust, oil stain and the like;
(2) spraying an alloying coating: the prepared alloying coating is evenly sprayed on the surface of 1.1 of the inner wall of the cylinder sleeve by a spray gun, and then the coating is dried by natural wind or a fan, and the thickness of the coating is even and reaches 0.5 mm. The alloying coating comprises 25 mass percent of alloy powder, 60 mass percent of alcohol and 15 mass percent of binder, wherein the mass percent of the alloy powder is as follows: ni 18%, Cr 30%, W20%, Mo 8%, V17% and Nb 7%;
(3) adopting laser spots to continuously radiate and scan 1.1 of the sprayed surface of the inner wall of the cylinder sleeve to enable alloy elements in the coating layer to permeate into the inner wall of the cylinder sleeve, wherein the processing power of laser is 10000W, and the laser spots use circular spots, elliptical spots or square spots, wherein the diameter of the circular spots is 1-3mm, the major axis and minor axis of the elliptical spots are 1-3mm, the length and width of the square spots are 2-5 mm, the processing speed is 12000mm/min, the processing area 3 adopts a spaced oblique line processing mode, as shown in figure 2, a two-way spaced oblique line processing mode is adopted, the spacing between laser welding beads in the processing area 3 is 0.3-0.8mm, the included angle between an oblique line and an axial straight line is 70-80 degrees, the processing area 3 occupies 65-90 percent, preferably more than 75 percent of the strengthening expected area, namely, the radiation area of the laser on the coating layer occupies 65-, preferably 75% or more. 2 or more processing heads can be adopted to work together in the processing process. The interval between two adjacent oblique lines is 0.5-1 mm. The surface after laser strengthening obtains a coating strengthening layer with the depth of 1.0mm, and the hardness reaches HRC50-HRC 65.
In one embodiment, the engine cylinder liner strengthening method comprises the following steps:
(1) cleaning the inner wall of the cylinder sleeve 1.1: cleaning the inner wall 1.1 of the cylinder sleeve to ensure that the inner wall 1.1 of the cylinder sleeve is free of rust, oil stain and the like;
(2) spraying an alloying coating: the prepared alloying coating is evenly sprayed on the surface of 1.1 of the inner wall of the cylinder sleeve by a spray gun, and then the coating is dried by natural wind or a fan, and the thickness of the coating is even and reaches 0.5 mm. The alloying coating comprises the following components in percentage by mass, namely 25% of alloy powder, 60% of alcohol and 15% of binder, wherein the alloy powder comprises the following components in percentage by mass: ni 16%, Cr 28%, W25%, Mo 8%, V18% and Nb 5%;
(3) the method comprises the steps of carrying out point-like interval radiation scanning on 1.1 of the sprayed surface of the inner wall of the cylinder sleeve by adopting laser spots, enabling alloy elements in a coating layer to permeate into the inner wall of the cylinder sleeve, and enabling the laser processing power to be 20000W, wherein the laser spots are circular spots, elliptical spots or square spots, the diameter of each circular spot is 2.5mm, the length and width of each elliptical spot is 2-2.5mm, the length and width of each square spot is 3-4mm, a processing area 3 is shown in figure 3, the interval between processing tracks 3 is 0.1-1mm, each point stays for 0.1-0.4s, and the processing area 3 occupies more than 75% of the strengthening expected area. 2 or more processing heads can be adopted to work together in the processing process. The surface after laser strengthening obtains a coating strengthening layer with the depth of 1.0mm, and the hardness reaches HRC50-HRC 65. The coating strengthening layer is an inner wall layer which comprises a coating layer and a cylinder sleeve and is irradiated by laser.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for strengthening an engine cylinder liner, comprising:
cleaning the inner wall of the cylinder sleeve;
uniformly spraying a prepared alloying coating on the surface of the inner wall of the cylinder sleeve to be reinforced, and air-drying a coating layer, wherein the alloying coating comprises 10-30% of alloy powder, 30-70% of alcohol and 5-15% of a binder, and the alloy powder is nickel, chromium, tungsten, molybdenum, vanadium and niobium;
and performing radiation scanning on the surface of the sprayed inner wall of the cylinder sleeve by using laser, so that alloy elements in the coating layer permeate into the inner wall of the cylinder sleeve, wherein the processing power of the laser is 4000-.
2. The engine cylinder liner strengthening method of claim 1, wherein the alloy powder comprises, by mass, 10-18% of nickel, 21-35% of chromium, 16-25% of tungsten, 5-8% of molybdenum, 14-18% of vanadium, and 3-7% of niobium.
3. The engine cylinder liner strengthening method of claim 1, wherein the thickness of the coating layer is 0.05-0.5 mm.
4. The engine cylinder sleeve strengthening method according to claim 1, characterized in that a laser spot is adopted to scan the inner wall of the cylinder sleeve, and the laser spot is a circular spot, an elliptical spot or a square spot, wherein the diameter of the circular spot is 1-3mm, the major axis and the minor axis of the elliptical spot are 1-3mm, and the length and the width of the square spot are 2-5 mm.
5. The engine cylinder liner strengthening method of claim 4, wherein the inner wall of the cylinder liner is continuously scanned by laser spots, and the processing speed is 9000-.
6. The engine cylinder sleeve reinforcing method according to claim 4, characterized in that the inner wall of the cylinder sleeve is intermittently scanned in a punctiform manner by laser spots, and the dwell time of each interval is 0.1-0.4 s.
7. The engine cylinder sleeve strengthening method according to claim 1, characterized in that the surface of the sprayed cylinder sleeve inner wall is scanned by adopting an interval oblique line processing mode, and the included angle between the oblique line and the axial straight line of the cylinder sleeve inner wall ranges from 60 degrees to 90 degrees.
8. The engine cylinder liner strengthening method of claim 1, wherein the irradiation area of the laser on the paint layer is 65-90% of the expected strengthening area.
9. The engine cylinder liner strengthening method of claim 8, wherein the irradiation area of the laser on the paint layer accounts for 75-90% of the expected strengthening area.
10. The engine cylinder liner strengthening method of claim 1, wherein a plurality of laser radiation heads are used to simultaneously perform radiation scanning on the coating layer.
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| CN202011576464.9A CN112746272A (en) | 2020-12-28 | 2020-12-28 | Engine cylinder sleeve strengthening method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114318330A (en) * | 2021-12-14 | 2022-04-12 | 江苏紫金动力股份有限公司 | Method for strengthening engine cylinder sleeve |
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