CN113458978A - Method for repairing sealing coating on inner surface of deep hole structure part - Google Patents
Method for repairing sealing coating on inner surface of deep hole structure part Download PDFInfo
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- CN113458978A CN113458978A CN202110606623.3A CN202110606623A CN113458978A CN 113458978 A CN113458978 A CN 113458978A CN 202110606623 A CN202110606623 A CN 202110606623A CN 113458978 A CN113458978 A CN 113458978A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
- B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
Abstract
The invention discloses a method for repairing a sealing coating on the inner surface of a deep-hole structural part, which comprises the following steps of 1: cleaning and deoiling, namely cleaning and deoiling the sealing coating on the surface of the deep-hole part by using a cleaning agent, and cleaning the sealing coating on the surface of the test piece by using a deoiling agent; step 2: removing the sealing coating remaining on the surface of the deep-hole part cleaned with the oil stain by high-pressure water washing; and step 3: performing sand blasting protection, namely performing sand blasting treatment on the surface of the deep-hole part after the sealing coating is cleaned; step 4; spraying protection, namely spraying the surface of the deep-hole part subjected to sand blowing, and spraying a sealing coating on the surface of the deep-hole part again, wherein the coating structure is Ni-Al 20% (bottom layer, 0.08-0.15 mm) + Al-Si 6% (surface layer, not less than 0.92 mm); step 5; and (3) checking the sealing coating, namely checking the sealing coating after the test piece is sprayed, measuring the coating tissue and the coating performance of each layer of the sealing coating, and solving the problem that the sealing coating on the inner circular surface of the labyrinth sealing sleeve of the medium-length hole part of the aircraft engine is difficult to repair.
Description
Technical Field
The invention relates to the technical field of sealing coating repair, in particular to a method for repairing a sealing coating on the inner surface of a deep-hole structural part.
Background
The sealing coating is a functional coating, and can deposit materials (such as aluminum-based alloy and other materials) on the surface of the part through a coating process, control the fit clearance between the parts, and reduce the leakage of fluid so as to achieve the purposes of improving the efficiency of an engine, reducing lubricating oil or pneumatic loss and the like. In the service life of an engine, if the inner circular surface coating of the deep-hole part is damaged or thinned, sealing failure can be seriously caused, and further lubricating oil leakage is caused, so that the sealing coating needs to be removed and repaired.
Before repair, according to the technical requirements, the residual coating on the inner circular surface needs to be removed completely, and then the coating needs to be sprayed again. The main problem faced is how to remove the residual coating from the inner circular surface and ensure that the substrate material is not affected.
The prior method for removing the old sealing coating on the inner circular surface of the labyrinth sealing sleeve on the engine comprises the following steps:
the first is that: a sand blowing and chemical removing mode is adopted, firstly, 6 percent of aluminum silicon (surface layer) metal coating can be completely removed by sand blowing, and because the Ni-Al20 percent metal bonding layer is well combined with a substrate and the metal bonding layer is difficult to remove by sand blowing, the metal bonding layer (Ni-Al20 percent) is removed by chemical soaking, but the method has the greatest difficulty in protecting deep-hole parts, and at present, no good protection mode exists.
Secondly, the following steps: the turning mode is adopted to remove Al-Si 6% (surface layer) + Ni-Al 20% (metal bonding layer), and part of the matrix is inevitably removed during turning. In addition, the sleeve is a thin-wall deep hole, so that the alignment difficulty before turning is high, and the machining efficiency is low.
In the prior art, when a sealing coating is removed and repaired, the sealing coating is easy to remove and repair only by sand blasting and cannot be cleaned, particularly, a dead angle part and a turning mode only cannot be controlled to cut, and a deep hole part base is easy to cut by mistake; therefore, a method for repairing the sealing coating on the inner surface of the deep-hole part with the deep-hole structure is urgently needed to remove and repair the sealing coating on the inner circular surface of the labyrinth sealing sleeve on the engine.
Disclosure of Invention
The invention provides a method for repairing a sealing coating on the inner surface of a deep-hole structural part, which aims to solve the technical problem that the sealing coating on the inner circular surface of a labyrinth sealing sleeve of the deep-hole structural part in an aircraft engine is difficult to remove and repair.
According to one aspect of the invention, a method for repairing a sealing coating on the inner surface of a deep-hole structural part is provided, which comprises the following steps:
step 1: cleaning and deoiling, namely cleaning and deoiling the sealing coating on the surface of the test piece by using a cleaning agent, and cleaning the sealing coating on the surface of the test piece by using a deoiling agent to remove oil stains on the surface of the sealing coating;
step 2: removing the coating, namely removing the sealing coating remained on the surface of the deep-hole part after oil stain cleaning through high-pressure water washing;
and step 3: performing sand blasting protection, namely performing sand blasting treatment on the surface of the deep-hole part after the sealing coating is cleaned;
step 4; spraying protection, namely spraying the surface of the deep-hole part subjected to sand blowing, and spraying a sealing coating on the surface of the deep-hole part again, wherein the coating has the structure of Ni-Al 20% (bottom layer) and Al-Si 6% (surface layer);
step 5; and (4) checking the sealing coating, namely checking the sealing coating after the test piece is sprayed, and measuring the coating structure and the coating performance of each layer of the sealing coating.
By adopting the technical scheme, when the labyrinth sealing coating of the deep-hole part of the aircraft engine is repaired, the original sealing coating is cleaned and oiled through the step 1, oil stain on the original old sealing coating is removed through a cleaning agent and the old sealing coating is softened, the old sealing coating is cleaned through high-pressure water washing in the step 2, and when the old sealing coating is cleaned through high-pressure water, because the material of the old sealing coating is different from that of the base material of the deep-hole part, only the old sealing coating on the outer wall of the deep-hole part is removed under the washing of the old sealing coating through the high-pressure water, the base material of the deep-hole part cannot be damaged, the sealing coating processed by the deep-hole part is blown sand through the step 3, the surface of the deep-hole part is polished smooth, and a new sealing coating is sprayed on the surface of the deep-hole part which is blown sand through the step 4, the sealing coating on the surface of the deep-hole part is repaired by spraying Ni-Al 20% (bottom layer) + Al-Si 6% (surface layer), the repaired new sealing coating is subjected to coating organization and coating performance detection in the step 5, and the problem that the sealing coating on the inner circular surface of the labyrinth sealing sleeve of the deep-hole part in the aircraft engine is difficult to remove and repair by observing that the coating organization and the coating performance of the new sealing coating meet the requirements.
Further, in the step 2, a sealing coating is removed by adopting high-pressure water washing, and the method specifically comprises the following steps:
the high-pressure water washing is to pressurize water by a high-pressure water generator, and then convert the water into high-speed fine water jet by a spraying device with fine apertures,
the speed of the fine water jet is controlled to be more than one Mach number, then the water flow acts on a target position in a spiral high speed mode through a high-speed rotating device of a high-pressure nozzle of the spraying device to form a water milling cutter effect, and an old sealing coating on the surface of the deep-hole part is washed and removed through a washing cutter formed by high-pressure water.
Through adopting above-mentioned technical scheme, pressurize rivers to thousands of atmospheric pressure through high pressure water generating device in step 2, spout high pressure water along high-pressure nozzle to will high-pressure nozzle form water milling cutter at high-speed rotation on the high-pressure squirt, wash the old coating of obturating that the sanitizer has been washd through the water milling cutter that high pressure water formed, clean up old coating of obturating, and wash old coating of obturating because coating and deep hole part of obturating through the high-pressure squirt.
Further, the process parameters of the high-pressure water in the step 2 are as follows: water pressure: 2600-: 1000-: 25-40 mm.
By adopting the technical scheme, the parameters of the high-pressure water are set to be water pressure 2600-, at the moment, the energy consumption required to be provided due to the fact that the rotating speed of the nozzle is too large is also too large, energy loss is easily caused, and the jet distance is set between 25mm and 40mm, so that the cutting effect of a water milling cutter formed by high-pressure water on an old sealing coating on the inner wall of a deep-hole part is optimal, when the jet distance is smaller than 25mm, the jet force of the high-pressure water is too large, the sealing coating is easily splashed in the deep-hole part to cause collision damage of the deep-hole part, the distance is too short, the impact force of the high-pressure water is too large, impact abrasion is easily caused on the inner wall of the deep-hole part, when the jet distance is larger than 40mm, the pressure of the high-pressure water jet cannot achieve the effect of cleaning the old sealing coating, and the large-area sealing coating cannot be cleaned easily.
Further, in the step 2, the surface of the deep-hole part washed by the high-pressure water is repeatedly cleaned by the oil removing agent, and the sealing coating is fully cleaned.
Through adopting above-mentioned technical scheme, through the high pressure water clearance in the repeated step 2, with the old coating residue clean up that seals on the deep hole part inner wall, the repetition carries out high pressure water washing, carries out abundant washing to the inner wall of deep hole part, and the rethread degreaser is deoiled the washing to the surface of the deep hole part that the high pressure water was cleared up for old coating clean up that seals conveniently carries out the spraying of new coating that seals.
Further, the deep-hole parts cleaned in the step 2 by high-pressure water washing are visually observed, and after the sealing coating on the surfaces of the deep-hole parts is cleaned, the surfaces of the deep-hole parts are dried, and the cleaned deep-hole parts are placed into a drying box for drying.
Through adopting above-mentioned technical scheme, through the old coating of obturating of water under high pressure clearance in step 2, the colour of observing the deep hole inner wall according to experience visual inspection can judge whether the clean up of the coating of obturating on the deep hole part inner wall, place the deep hole part of clean up and carry out drying process at the stoving incasement, remaining drop of water is dried when washing the high-pressure water, avoid remaining a large amount of drops of water on the inner wall of deep hole part, cause the coating of obturating to adsorb inhomogeneous when carrying out the spraying coating of obturating to the inner wall of deep hole part, thereby influence the restoration of the coating of obturating of deep hole part.
Further, the process parameters of the drying box for drying the deep-hole parts in the step 2 are as follows: drying at 50-80 deg.C for 20-40 min.
By adopting the technical scheme, the temperature of the drying box is set between 50 ℃ and 80 ℃, the drying effect of the drying box on the deep-hole parts is best, when the temperature is lower than 50 ℃, the drying time of the drying box on the deep-hole parts is too long, which is not beneficial to production, when the temperature is higher than 80 ℃, the drying effect of the drying box on the deep-hole parts is good, but the temperature is too high, which is not beneficial to fast taking after drying, and too much energy consumption is consumed during drying, the drying time is set between 20 minutes and 40 minutes, because the deep-hole parts have deep inner holes and more adsorbed water drops, the drying box can not timely transmit hot air to the deep hole parts when drying the deep-hole parts, the water drops in the deep-hole parts can be fully dried by drying for 20 minutes to 40 minutes, if the time is less than 20 minutes, the water drops in the deep-hole parts can not be dried in time easily, if the time is longer than 40min, when deep-hole parts in the drying box are dried, the energy consumption of the drying box is increased easily due to overlong time.
Further, before drying in the drying box, the moisture on the deep-hole parts is dried by compressed air, and the pressure of the compressed air is 0.1-0.5 MPa.
Through adopting above-mentioned technical scheme, the deep hole part air-dries the processing through compressed air when drying, blows off the adsorbed drop of water of deep hole part hole depths through compressed air, avoids deep hole part structure complicacy to lead to the drop of water to adsorb inside, need expend a large amount of time to heat the deep hole part when drying, and the drop of water in the deep hole part is detached through compressed air processing, can accelerate the stoving of deep hole part, reduces the stoving time, has practiced thrift the energy consumption.
Furthermore, in the step 4, before the deep-hole part is subjected to spray protection, the deep-hole part needs to be subjected to sand blasting treatment, the residual sealing coating on the surface of the deep-hole part is cleaned, the surface of the deep-hole part is polished by a sand blasting machine, the gloss of the surface of the deep-hole part is guaranteed, so that the residual coating on the deep-hole part and the substrate of the deep-hole part are distinguished, visual distinction is facilitated, and the surface roughness of the deep-hole part is changed by the sand blasting treatment of the deep-hole part, so that a new sealing coating can be sprayed.
Through adopting above-mentioned technical scheme, before carrying out the spraying protection to the deep hole part, treat the spraying surface to the deep hole part through the sand blower and blow the sand and handle, polish the surface that treats the spraying with the deep hole part and control the roughness on deep hole part surface, conveniently when carrying out the spraying of new seal coating for new seal coating adhesion is firm.
Further, when a new sealing coating is sprayed on the deep-hole part in the step 4, the Ni-Al 20% and the Al-Si 6% are sequentially melted by using heat energy and then sprayed to a required position.
By adopting the technical scheme, when a new sealing coating is sprayed on the deep-hole part, the Ni-Al 20% and the Al-Si 6% are sequentially melted and sprayed at the appointed position, the coating of the sealing coating is firmer by sequentially melting the Ni-Al 20% and the Al-Si 6%, and the Ni-Al 20% and the Al-Si 6% are sequentially melted and sprayed, so that the operation is convenient and the adhesion is firm when the sealing coating is repaired.
Further, in the step 5, the coating structure distribution and the coating performance of the sealing coating sprayed on the test piece again are observed through a microscope.
By adopting the technical scheme, the new sealing coating is sprayed on the inner wall of the deep-hole part after the old sealing coating is cleaned up, the new sealing coating and the old sealing coating are observed through a microscope, the coating tissue distribution and the performance of the combined coating of the new sealing coating are observed under the microscope through section observation of a test piece, and the new sealing coating is obtained to meet the use standard.
The invention has the following beneficial effects:
the invention relates to a method for repairing a sealing coating on the inner surface of a deep-hole part with a deep-hole structure, which comprises the steps of removing oil stains on an old sealing coating by using an oil stain cleaning agent when repairing the sealing coating of the deep-hole part, pressurizing water to thousands of atmospheric pressures by using a high-pressure water gun, converting the water into high-speed micro water jet by using a spraying device with small pore diameter, wherein the speed of the water jet is generally more than one Mach number, the water jet has huge striking energy, enabling water flow to act on the surface of an object in a spiral high speed by using a high-speed rotating device of a nozzle, forming a water milling cutter by rotating the high-pressure nozzle along the high-pressure water gun at a high speed, cutting and cleaning the old sealing coating by using the high-speed rotating water milling cutter, repeatedly performing oil stain cleaning and high-pressure water cleaning on the surface to be repaired of the deep-hole part, and removing the old sealing coating on the surface of the deep-hole part, compressed air is conducted on cleaned deep-hole parts to be air-dried, large water drops adsorbed on the deep-hole parts are cleaned, the deep-hole parts air-dried through the compressed air are baked in a drying box, the water drops adsorbed on the deep-hole parts are cleaned, the surface to be repaired of the deep-hole parts is polished smoothly through a sand blower, and molten Ni-Al 20% and Al-Si 6% coatings are sprayed on the surface to be repaired of the deep-hole parts to form a new sealing coating, so that the problem that the sealing coating of the inner circular surface of a labyrinth sealing sleeve of the deep-hole parts in an aircraft engine is difficult to repair is solved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic overall flow diagram of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the high pressure water of the preferred embodiment of the present invention;
FIG. 3 is a microscopic view of the tissue distribution of the novel seal coating of the preferred embodiment of the present invention.
Illustration of the drawings:
1. a high pressure water gun; 2. a high-pressure spray head.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 1 and fig. 2, the embodiment discloses a method for repairing a sealing coating on an inner surface of a deep-hole structural part, which includes selecting a deep-hole part to be repaired with a sealing coating as a test piece.
Step 1: cleaning and deoiling, cleaning and deoiling the sealing coating on the surface of the test piece by using a cleaning agent, and cleaning the sealing coating on the surface of the test piece by using a deoiling agent to remove oil stains on the sealing coating. In the step 1, the coating on the surface of the test piece is continuously cleaned and deoiled by adopting a common cleaning agent, such as Yitong stainless steel three-in-one cleaning agent, SP-109 multifunctional oil stain cleaning agent and the like. And cleaning the sealing coating of the deep-hole part to be tested by using an oil stain cleaning agent to remove redundant oil stains.
Step 2: and removing the coating, namely removing the sealing coating remained on the surface of the deep-hole part cleaned with the oil stain by high-pressure water washing. In the step 2, high-pressure water is adopted to remove when an old sealing coating is removed, the high-pressure water gun 1 is connected with a high-pressure nozzle 2 to generate high-pressure water to be aligned with the sealing coating to be repaired to be cleaned, the high-pressure water gun 1 pressurizes the water to more than thousands of atmospheric pressures, the water is converted into high-speed fine water jet through a spraying device with fine apertures, the speed of the water jet is generally more than one-time Mach number and has huge striking energy, then the water jet passes through a high-speed rotating device of the nozzle to act on the surface of an object in a spiral high-speed mode, the high-pressure nozzle 2 rotates at a high speed along the high-pressure water gun 1 to form a water milling cutter, and the old sealing coating is cut and cleaned through the high-speed rotating water milling cutter. And removing the residual sealing coating on the surface of the deep-hole part by using high-pressure water. The parameter of the high-pressure water in the high-pressure water gun 1 is 2800bar, the rotating speed of the high-pressure spray head 2 is 1100rpm, and the spraying distance of the high-pressure spray head 2 to the inner wall of the deep-hole part is 35 mm. And (3) repeating the operation of the step (1) on the sealing coating on the surface of the deep-hole part, removing oil on the surface of the deep-hole part by using an oil removing agent, and repeatedly washing by using high-pressure water in the step (2) to clear the residual sealing coating on the surface of the deep-hole part.
The deep-hole parts are repeatedly cleaned by high-pressure water, and after the deep-hole parts are cleaned, the cleaned deep-hole parts are visually observed, so that the sealing coating is clear and complete.
And (3) blowing the deep-hole part which is completely cleaned by the high-pressure water in the step (2), cleaning water drops adsorbed in the deep-hole part by penetrating compressed air through the deep-hole part, wherein the pressure of the compressed air is 0.3MPa, and drying the deep-hole part which is completely cleaned by the water drops. And (3) putting the deep-hole parts into a drying box for drying treatment, wherein the technological parameters of the drying box are set to be 60 ℃, and the drying time is set to be 30 min. The deep-hole parts are dried through the drying box, and after 30min of constant-temperature baking at 60 ℃, adsorbed water drops in the deep-hole parts are completely cleaned, so that the to-be-repaired surfaces of the deep-hole parts are in a dry state, and the phenomena that molten Ni-Al 20% and Al-Si 6% coatings react with water to generate oxide impurities when new sealing coatings are sprayed due to the fact that the surfaces of the deep-hole parts are wet are avoided.
And step 3: and (4) performing sand blasting protection, performing sand blasting treatment on the surface of the deep-hole part after the sealing coating is cleaned, polishing the position of the surface of the deep-hole part to be sprayed with the sealing coating through a sand blasting machine, and polishing the surface roughness of the deep-hole part until the requirement of spraying a new sealing coating is met.
And 4, step 4: and (4) spray protection, namely performing spray treatment on the surface of the deep-hole part subjected to sand blowing, and spraying a sealing coating on the surface of the deep-hole part again, wherein the coating structure is Ni-Al 20% (bottom layer) and Al-Si 6% (surface layer). Heating Ni-Al 20% and Al-Si 6% to a molten state, setting Ni-Al 20% as a bottom layer of a sealing coating, wherein the thickness is 0.1mm, spraying Al-Si 6% on a Ni-Al 20% layer to form a surface layer, the thickness is 0.92mm, and sequentially spraying Ni-Al 20% and Al-Si 6% coatings to complete the repairing of the sealing coating of the deep-hole part.
Referring to fig. 1 and fig. 3, the method for repairing the sealing coating on the inner surface of the deep-hole part with the deep-hole structure further comprises a step 5; and (4) checking the sealing coating, namely checking the sealing coating after the test piece is sprayed, and measuring the coating structure and the coating performance of each layer of the sealing coating. And (3) detecting the coating tissues and the coating performances before and after the repairing of the sealing coating through a microscope, so as to meet the design requirements.
The working principle of the method for repairing the sealing coating on the inner surface of the deep-hole structural part comprises the following steps: when repairing a sealed coating of a deep-hole part, removing oil stains on an old sealed coating by using an oil stain cleaning agent, pressurizing water to thousands of atmospheric pressures by using a high-pressure water gun, converting the water into high-speed micro water jet by using a spraying device with small apertures, wherein the speed of the water jet is generally more than one Mach number and has huge striking energy, then enabling the water flow to act on the surface of an object in a spiral shape at high speed by using a high-speed rotating device of a spray head, forming a water milling cutter by the high-pressure spray head rotating along the high-pressure water gun at high speed, cutting and cleaning the old sealed coating by using the water milling cutter rotating at high speed, repeatedly performing oil stain cleaning and high-pressure water cleaning on the surface to be repaired of the deep-hole part, completely removing the old sealed coating on the surface of the deep-hole part, and cleaning large water beads adsorbed on the deep-hole part by performing compressed air drying on the cleaned deep-hole part, the deep-hole part air-dried by compressed air is baked in a drying box, water drops adsorbed on the deep-hole part are cleaned, the surface to be repaired of the deep-hole part is polished smoothly by a sand blower, and molten Ni-Al 20% and Al-Si 6% coatings are sprayed on the surface to be repaired of the deep-hole part to form a new sealing coating.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for repairing a sealing coating on the inner surface of a deep hole structure part is characterized by comprising the following steps: the method comprises the following steps:
step 1: cleaning and deoiling, namely cleaning and deoiling the sealing coating on the surface of the test piece, and cleaning the sealing coating on the surface of the test piece by using a deoiling agent to remove oil stains on the surface of the sealing coating;
step 2: removing the coating, namely removing the sealing coating remained on the surface of the deep-hole part after oil stain cleaning through high-pressure water washing;
and step 3: performing sand blasting protection, namely performing sand blasting treatment on the surface of the deep-hole part after the sealing coating is cleaned;
step 4; spraying protection, namely spraying a sealing coating on the surface of the deep-hole part subjected to sand blowing again, wherein the coating has the structure of Ni-Al 20% (bottom layer) and Al-Si 6% (surface layer);
step 5; and (4) checking the sealing coating, namely checking the sealing coating after the test piece is sprayed, and measuring the coating structure and the coating performance of each layer of the sealing coating.
2. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 1, wherein the method comprises the following steps:
and 2, removing the sealing coating by adopting high-pressure water washing, which specifically comprises the following steps:
the high-pressure water washing is to pressurize water by a high-pressure water generator, and then convert the water into high-speed fine water jet by a spraying device with fine apertures,
the speed of the fine water jet is controlled to be more than one Mach number, then the water flow acts on a target position in a spiral high speed mode through a high-speed rotating device of a high-pressure nozzle of the spraying device to form a water milling cutter effect, and an old sealing coating on the surface of the deep-hole part is washed and removed through a washing cutter formed by high-pressure water.
3. The method for repairing a sealing coating on an inner surface of a deep-hole structural part according to claim 2, wherein the method comprises the step of applying a sealing coating on an inner surface of a deep-hole structural part
The technological parameters of the high-pressure water in the step 2 are as follows:
water pressure: 2600-,
rotating speed of the nozzle: 1000-
Jet distance: 25-40 mm.
4. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 3, wherein the method comprises the following steps:
adding the following steps after the step 2: and (4) cleaning the surface of the deep-hole part washed by high-pressure water again by using the degreasing agent, and fully cleaning the residues of the sealing coating.
5. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 1, wherein the method comprises the following steps:
adding the following steps after the step 2: and (3) carrying out visual observation on the deep-hole part cleaned by the high-pressure water washing in the step (2), and after the sealing coating on the surface of the deep-hole part is cleaned, drying the surface of the deep-hole part, and putting the cleaned deep-hole part into a drying box for drying.
6. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 5, wherein the method comprises the following steps:
the process parameters of the drying box for drying the deep-hole parts are as follows:
drying at 50-80 deg.C for 20-40 min.
7. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 6, wherein the method comprises the following steps:
before drying in a drying box, the moisture on the deep-hole parts is dried by compressed air, and the pressure of the compressed air is 0.1-0.5 MPa.
8. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 1, wherein the method comprises the following steps:
and 3, performing sand blasting treatment on the surface of the deep-hole part after the sealing coating is cleaned, specifically:
the method has the advantages that the residual sealing coating on the surface of the deep-hole part is cleaned, the surface of the deep-hole part is polished by the sand blower to ensure the gloss of the surface of the deep-hole part, so that the residual sealing coating and the substrate of the deep-hole part on the deep-hole part are distinguished, visual distinction is facilitated, and the surface roughness of the deep-hole part is changed by the sand blower treatment of the deep-hole part, so that the new sealing coating can be sprayed.
9. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 8, wherein the method comprises the following steps:
and 4, when spraying a new sealing coating on the sand-blown deep-hole part, melting Ni-Al 20% and Al-Si 6% in sequence by using heat energy and then spraying the molten Ni-Al 20% and Al-Si 6% to a target position.
10. The method for repairing the sealing coating on the inner surface of the deep-hole structural part according to claim 1, wherein the method comprises the following steps:
and 5, carrying out test observation on the coating structure distribution and the coating performance of the sealing coating sprayed again on the test piece through a microscope.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134447A (en) * | 2021-11-16 | 2022-03-04 | 武汉材料保护研究所有限公司 | Method for repairing Babbitt metal layer in inner hole of labyrinth sealing type cover plate |
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| CN115122243A (en) * | 2022-07-25 | 2022-09-30 | 西门子燃气轮机部件(江苏)有限公司 | Coating thickness removing method with controllable coating thickness |
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