CN111230309B - Novel coating cleaning method - Google Patents
Novel coating cleaning method Download PDFInfo
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- CN111230309B CN111230309B CN202010106084.2A CN202010106084A CN111230309B CN 111230309 B CN111230309 B CN 111230309B CN 202010106084 A CN202010106084 A CN 202010106084A CN 111230309 B CN111230309 B CN 111230309B
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- 238000000576 coating method Methods 0.000 title claims abstract description 86
- 239000011248 coating agent Substances 0.000 title claims abstract description 83
- 238000004140 cleaning Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000010521 absorption reaction Methods 0.000 claims abstract description 34
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 230000035939 shock Effects 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 9
- 238000004880 explosion Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 46
- 150000002500 ions Chemical class 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 239000011247 coating layer 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
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000012720 thermal barrier coating Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a novel coating cleaning method, wherein a cleaning device adopted by the method comprises a laser generating system for generating laser, a light path conversion system for focusing the laser, an absorption layer coating system matched with the laser, a motion system for controlling the movement of the cleaning device, a recovery system for recovering a falling coating, a water spraying system for generating an ionic water layer and a control system; the cleaning method comprises the following steps: 1: uniformly coating an absorption layer on the surface of a workpiece to be cleaned by using an absorption layer coating system, and placing the workpiece on a workbench; 2: starting a laser generating system to generate a laser beam according to preset laser parameters, wherein the laser beam is opposite to the workpiece to be cleaned in the step 1; 3: and focusing the laser in the step 2 into a focused laser beam through a light path conversion system, and forming a preset laser spot size by the focused laser beam.
Description
Technical Field
The invention relates to the technical field of laser processing, in particular to a novel coating cleaning method.
Background
The coating is widely applied to aerospace key components, and comprises but is not limited to a rust layer, a wear-resistant coating, a heat-resistant oxidation-resistant coating, an atmospheric and immersion corrosion resistant coating, an electric conduction and resistance coating, a mechanical part gap control coating, a chemical corrosion resistant coating and the like. Failure of the coating or damage and deterioration in use requires removal of the existing coating. Currently, physical (sand blasting and high-pressure water impact) and chemical (acid-base solution) methods are commonly used for removing the organic substances.
The methods have the defects of poor process controllability, long period, environmental pollution and easy damage to a substrate and a bonding layer. Especially, the zirconium oxide thermal barrier coating is mainly removed by blowing sand at present, and is used as the hot end component of the engine with the most harsh service condition, and the thermal barrier coating repair of the turbine blade and the guide blade occupies the main production share of the engine overhaul, so that an advanced removal method is particularly needed.
Disclosure of Invention
The embodiment of the invention provides a novel coating cleaning method, which is not limited by the shapes of a base material, a coating material and a removal area, and introduces residual compressive stress on the surface of the base material while removing the coating on the surface of the base material, thereby improving the performance of the base material and avoiding the damage to the base material in the coating removal process.
In a first aspect, an embodiment of the present invention provides a novel coating cleaning method, which is characterized in that a cleaning device adopted in the method includes a laser generation system for generating laser, a light path conversion system for focusing laser, an absorption layer coating system for matching with the laser, a motion system for controlling the movement of the cleaning device, a recovery system for recovering a falling coating, a water spray system for generating an ionic water layer, and a control system, wherein the laser generation system, the light path conversion system, the absorption layer coating system, the motion system, the recovery system, and the water spray system are all electrically connected with the control system; the cleaning method comprises the following steps:
step 1: uniformly coating an absorption layer on the surface of a workpiece to be cleaned by using an absorption layer coating system, and placing the workpiece on a workbench;
step 2: starting a laser generating system to generate a laser beam according to preset laser parameters, wherein the laser beam is opposite to the workpiece to be cleaned in the step 1;
and step 3: focusing the laser in the step 2 into a focused laser beam through a light path conversion system, and focusing the laser beam to form a preset laser spot size;
and 4, step 4: starting a water spraying system by a control system to spray water to the surface of an absorption layer of a workpiece to be cleaned, so that an ion flowing water layer is formed on the surface of the absorption layer and is used as a restraint layer during laser cleaning;
and 5: the focused laser beam irradiates the absorption layer through the ion flowing water layer, the laser and the absorption layer interact to generate plasma explosion, the plasma explosion generates high-pressure shock waves which are transmitted to the coating and the workpiece direction under the constraint action of the constraint layer, the coating on the surface of the workpiece falls off under the action of the high-pressure shock waves, and the fallen coating enters a recovery system;
step 6: and the control system controls the cleaning device to move according to the set cleaning track, and finally the coating cleaning of the whole workpiece surface is finished.
Further, the thickness of the surface coating of the workpiece to be cleaned in the step 1 is 1-10000 μm.
Further, the absorption layer in the step 1 is an adhesive tape, black paint or dark liquid film, and the thickness is 0.01 mm-2 mm.
Further, in the step 2, the laser parameters are that the pulse width range is 5 ms-1000 ms, the wavelength is 530 nm-1080 nm, the energy is 10J-1000J, and the power density range is 107～1012GW/cm2The laser pulse repetition frequency is 0.001 Hz-100 Hz.
Further, when the 5PS is more than or equal to H +2H, coating removal is carried out on the front side and the back side of the workpiece; when 5PS is less than H +2H, removing the coating on the front or back surface of the workpiece; wherein P is the laser pulse width, S is the shock wave velocity, H is the workpiece thickness, and H is the coating thickness.
Further, the laser spot size in step 3 is 1 mm-500 mm.
Furthermore, the ion flowing water layer in the step 4 is deionized water, the resistivity of the deionized water is more than 10 megaohm-cm, and the thickness of the ion flowing water layer is 1 mm-2 mm.
Compared with the existing physical and chemical cleaning method, the method has the advantages that high-energy and high-power pulse laser is used for inducing high-pressure plasma explosion and shock waves on the surface (with a coating) of the workpiece material adhered with the absorption layer, the shock pressure is high, the cleaning effect is good, the coatings on the front surface and the back surface of the workpiece are removed, the impact area can be adjusted according to the size of a light spot, the area is controllable, the coatings can be selectively cleaned as long as light beams can reach, and the flexibility is high; the cleaning process is a green process, has no pollution, and can be widely applied to removing paint layers, rust layers, thermal barrier coatings and plasma spraying coatings; when the coating on the surface of the substrate is removed, residual compressive stress is introduced on the surface of the substrate material, so that the performance of the substrate material is improved, and the damage to the substrate material in the coating removal process is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, 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 view of a cleaning apparatus according to the present invention;
FIG. 2 is a schematic view showing the cleaning operation of the coating layer according to the present invention.
In the figure:
1. the device comprises a laser generating system 100, a laser beam 2, a light path conversion system 201, a focused laser beam 3, an absorption layer coating system 300, an absorption layer 4, a workpiece 401 to be cleaned, a front coating 402, a back coating 5, a control system 6, a motion system 7, a recovery system 8, a water spraying system 800, an ion flowing water layer 901, a shock wave 902 and a reflected wave.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 to 2 show a novel coating cleaning method according to an embodiment of the present invention, in which a cleaning device used in the method includes a laser generating system 1 for generating laser, a light path converting system 2 for focusing laser, an absorbing layer coating system 3 for cooperating with laser, a motion system 6 for controlling movement of the cleaning device, a recovery system 7 for recovering a falling coating, a water spraying system 8 for generating an ionic water layer, and a control system 5, and the laser generating system 1, the light path converting system 2, the absorbing layer coating system 3, the motion system 6, the recovery system 7, and the water spraying system 8 are all electrically connected to the control system 5; the cleaning method comprises the following steps:
step 1: uniformly coating the surface of a workpiece to be cleaned with an absorption layer 300 by using an absorption layer coating system 3, and placing the workpiece on a workbench;
step 2: starting the laser generating system 1 to generate a laser beam 100 according to preset laser parameters, wherein the laser beam 100 is opposite to the workpiece 4 to be cleaned in the step 1;
and 3, step 3: focusing the laser beam 100 in the step 2 into a focused laser beam 201 through the optical path conversion system 2, wherein the focused laser beam 201 forms a preset laser spot size;
and 4, step 4: the control system 5 starts the water spraying system 8 to spray water to the surface of the absorption layer 300 of the workpiece 4 to be cleaned, so that an ion flowing water layer 800 is formed on the surface of the absorption layer 300 and is used as a constraint layer during laser cleaning, and the constraint layer in the embodiment can also be transparent ice blocks or transparent glass;
and 5: the focused laser beam 201 irradiates the absorption layer 300 through the ion flowing water layer 800, the laser interacts with the absorption layer 300 to generate plasma explosion, the plasma explosion generates high-pressure shock waves which are transmitted to the coating and the workpiece 4 under the constraint action of the constraint layer, the coating on the surface of the workpiece 4 falls off under the action of the high-pressure shock waves, and the fallen coating enters the recovery system 7;
step 6: the control system 5 controls the cleaning device to move according to the set cleaning track, and finally the coating cleaning of the whole workpiece 4 surface is completed.
As a specific embodiment of the present invention, the thickness of the coating on the surface of the workpiece 4 to be cleaned in step 1 is 1 μm to 10000 μm, and the coating in this embodiment may be a rust layer, a wear-resistant coating, a heat-resistant oxidation-resistant coating, an atmospheric and corrosion-resistant coating, an electric conductive and resistance coating, a gap control coating for mechanical parts, or a chemical corrosion-resistant coating.
As a specific embodiment of the invention, the absorption layer 300 in step 1 is an adhesive tape, black paint or dark liquid film, and the thickness is 0.01 mm-2 mm.
As a specific embodiment of the present invention, in step 2, the laser parameters are pulse width ranging from 5ms to 1000ms, wavelength ranging from 530nm to 1080nm, energy ranging from 10J to 1000J, and power density ranging from 107～1012GW/cm2The repetition frequency of the laser pulse is 0.001 Hz-100 Hz.
As a specific embodiment of the invention, when 5PS is more than or equal to H +2H, coating removal is carried out on the front surface and the back surface of the workpiece 4; and when the 5PS is less than H +2H, removing the coating on the front surface or the back surface of the workpiece 4, wherein P is the laser pulse width, S is the shock wave velocity, H is the workpiece thickness, and H is the coating thickness.
As a specific embodiment of the invention, the laser spot size in step 3 is 1mm to 500 mm.
As a specific embodiment of the invention, the ion flow water layer 800 in step 4 is deionized water, the resistivity of the deionized water is greater than 10 MegaOhm & cm, and the thickness of the ion flow water layer is 1mm to 2 mm.
In the implementation of this embodiment, the laser beam 100 is focused into a spot of a desired size by an optical conversion system, the focused laser beam forms a focused laser beam 201 and irradiates on the absorption layer 300 tightly coated on the coating layer through the transparent ion flowing water layer 800, the laser interacts with the absorption layer 300 to generate plasma explosion, the plasma explosion generates a high-pressure shock wave 901 propagating towards the coating layer and the workpiece 4 under the constraint action of the ion flowing water layer 300, the front coating 401 of the workpiece 4 falls off under the action of the high-pressure shock wave 901, the shock wave continues propagating along the workpiece 4 to the back surface of the workpiece 4 to be reflected to generate a reflected wave 902, the back coating of the workpiece 4 falls off under the action of the reflected wave 902, and the fallen coating enters the recovery system 7. Residual compressive stress is generated on the surface of the workpiece 4 after the coating is removed. The fatigue resistance, wear resistance and stress corrosion resistance of the workpiece 4 are improved.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the embodiments of the method, reference is made to the partial description of the embodiments of the apparatus for the relevant points. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (4)
1. A novel coating cleaning method is characterized in that a cleaning device adopted by the method comprises a laser generating system for generating laser, a light path conversion system for focusing the laser, an absorption layer coating system matched with the laser, a motion system for controlling the movement of the cleaning device, a recovery system for recovering a falling coating, a water spraying system for generating an ion water layer and a control system, wherein the laser generating system, the light path conversion system, the absorption layer coating system, the motion system, the recovery system and the water spraying system are all electrically connected with the control system; the cleaning method comprises the following steps:
step 1: uniformly coating an absorption layer on the surface of a workpiece to be cleaned by using an absorption layer coating system, and placing the workpiece on a workbench, wherein the absorption layer is an adhesive tape, black paint or a dark liquid film, and the thickness of the absorption layer is 0.01-2 mm;
and 2, step: starting a laser generating system to generate a laser beam according to preset laser parameters, wherein the laser beam is opposite to the workpiece to be cleaned in the step 1;
and step 3: focusing the laser in the step 2 into a preset laser spot size through a light path conversion system, and focusing a laser beam to form the preset laser spot size;
and 4, step 4: starting a water spraying system by a control system to spray water to the surface of an absorption layer of a workpiece to be cleaned, so that an ion flowing water layer is formed on the surface of the absorption layer and is used as a restraint layer during laser cleaning;
and 5: the focused laser beam irradiates on the absorption layer through the ion flowing water layer, the laser and the absorption layer interact to generate plasma explosion, the plasma explosion generates high-pressure shock waves which are transmitted to the coating and the workpiece under the constraint action of the constraint layer, the coating on the surface of the workpiece falls off under the action of the high-pressure shock waves, and the fallen coating enters a recovery system;
step 6: the control system controls the cleaning device to move according to a set cleaning track, and finally the coating cleaning of the whole workpiece surface is completed;
in the step 2, the laser parameters are that the pulse width range is 5 ms-1000 ms, the wavelength is 530 nm-1080 nm, the energy is 10J-1000J, and the power density range is 107～1012GW/cm2The repetition frequency of laser pulse is 0.001 Hz-100 Hz, and when 5PS is more than or equal to H +2H, coating removal is carried out on the front side and the back side of the workpiece; when 5PS is less than H +2H, removing the coating on the front or back surface of the workpiece; wherein P is the laser pulse width, S is the shock wave velocity, H is the workpiece thickness, and H is the coating thickness.
2. The novel coating cleaning method according to claim 1, wherein the thickness of the coating on the surface of the workpiece to be cleaned in step 1 is 1 μm to 10000 μm.
3. The novel coating cleaning method according to claim 1, wherein the laser spot size in step 3 is 1 mm-500 mm.
4. The novel method for cleaning a coating according to claim 1, wherein the ion-flow water layer in step 4 is deionized water, the resistivity of the deionized water is greater than 10 mega ohm-cm, and the thickness of the ion-flow water layer is 1mm to 2 mm.
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| CN202010106084.2A CN111230309B (en) | 2020-02-20 | 2020-02-20 | Novel coating cleaning method |
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| CN202010106084.2A CN111230309B (en) | 2020-02-20 | 2020-02-20 | Novel coating cleaning method |
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| CN111230309A CN111230309A (en) | 2020-06-05 |
| CN111230309B true CN111230309B (en) | 2022-06-10 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505297A (en) * | 2020-11-17 | 2022-05-17 | 中国科学院沈阳自动化研究所 | A kind of laser cleaning and strengthening composite rust removal method for plate heat exchange fins |
| EP4056310A1 (en) * | 2021-03-10 | 2022-09-14 | General Electric Company | Method of removing contaminants from a diffusion-coated component |
| CN113118631B (en) * | 2021-03-17 | 2023-01-17 | 江苏大学 | A Method Based on Laser Shock for Thick Coating Removal and Substrate Surface Modification |
| CN113305104A (en) * | 2021-05-26 | 2021-08-27 | 广东省科学院新材料研究所 | Method for stripping and removing coating on surface of substrate |
| CN113458609A (en) * | 2021-05-27 | 2021-10-01 | 上海传芯半导体有限公司 | Processing method for regenerating mask light-transmitting substrate and manufacturing method for mask substrate |
| CN115780348A (en) * | 2022-10-20 | 2023-03-14 | 北京航空航天大学合肥创新研究院(北京航空航天大学合肥研究生院) | Water jet assisted laser cleaning method for surface of fan blade |
| CN115945465A (en) * | 2023-02-01 | 2023-04-11 | 南昌航空大学 | A method for removing zirconia thermal barrier coating |
| CN117225819A (en) * | 2023-09-21 | 2023-12-15 | 中国人民解放军空军工程大学航空机务士官学校 | Duplex cleaning method for composite material coating |
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