CN114054456A - Protective fixture for removing coating of grate ring piece and repair process for coating on surface of grate ring piece - Google Patents
Protective fixture for removing coating of grate ring piece and repair process for coating on surface of grate ring piece Download PDFInfo
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- CN114054456A CN114054456A CN202111349801.5A CN202111349801A CN114054456A CN 114054456 A CN114054456 A CN 114054456A CN 202111349801 A CN202111349801 A CN 202111349801A CN 114054456 A CN114054456 A CN 114054456A
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- ring
- coating
- grate
- upper cover
- labyrinth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a protective fixture for removing a coating of a labyrinth ring piece, the labyrinth ring piece comprises a base ring and a labyrinth ring which are annular and are connected along the axial direction, a sealing labyrinth on the outer ring surface of the labyrinth ring is covered with a spraying layer, and the protective fixture comprises: the clamp comprises a clamp body, an upper cover body and an upper pressing assembly; the clamp body is vertically arranged, the lower end of the clamp body is used for being connected with the coating removing equipment, and the opposite upper end of the clamp body is used for supporting and positioning the grate ring piece; the upper cover body is connected to the upper end of the clamp body at intervals relatively so as to be matched with the clamp body to cover and protect a base body ring supporting the comb-tooth ring piece positioned on the clamp body; the upper pressing component is connected with the clamp body and is used for pressing and fixing the comb tooth ring extending out of the upper cover body on the clamp body downwards. The protective fixture for removing the coating of the grate ring piece has the advantages of simple structure, simple and convenient operations of installation, positioning, protection and the like of the grate ring piece, good protective effect of the matrix ring and easy disassembly.
Description
Technical Field
The invention relates to the technical field of removal of coatings on the surfaces of sealing labyrinth teeth, in particular to a protective fixture for removing coatings of a labyrinth tooth ring piece. In addition, the invention also relates to a grate ring surface coating repairing process by using the grate ring coating removing protection clamp.
Background
The turbine rotor part of a certain type of engine adopts a labyrinth and honeycomb sealing structure to carry out gas sealing, a baffle plate with the labyrinth structure is arranged in front of and behind each stage of rotor, and in order to achieve a better sealing effect, the labyrinth and the honeycomb carry out dynamic gas sealing in a small clearance fit mode. When the engine works, the comb teeth are inserted into the honeycombs and rub with the honeycombs, in order to prevent the comb tooth tips from being worn after long-term work and ensure the sealing effect, a wear-resistant nickel aluminum/aluminum oxide coating needs to be sprayed on the surface of the sealed comb tooth structure, the wear resistance of the comb teeth is improved, and the thickness of the coating can reach 0.215mm, as shown in figure 1. During the repair of an engine, the coating on the grate is abraded, the surface coating can be seriously failed, and the service life of parts is influenced, so that the nickel-aluminum/aluminum oxide coating on the surface of the grate needs to be removed and then sprayed again for repair. The difficulty of the repair process of the grate part lies in how to remove the original coating on the surface of the part completely and reduce the damage to the grate.
At present, the sealing labyrinth tooth coating is difficult to repair, a repair process is not available, and the sealing labyrinth tooth coating of the engine is scrapped after being worn. The reason why the traditional part coating removal method cannot be adopted is as follows:
the first is that: the method has the advantages that the surface coating of the sealing labyrinth is directly turned and removed by adopting a turning mode, the method can influence a part base body, and the machining damage to the tooth shape is great because the labyrinth structure of the baffle is irregular in shape, so that the surface coating cannot be removed by adopting the machining method.
Secondly, the following steps: the parts of the aero-engine are thin in grate by adopting a sand blowing or chemical method, and the coatings removed by adopting the sand blowing or chemical method have great influence on the matrix, so that the parts are unusable.
Disclosure of Invention
The invention provides a protective fixture for removing a coating of a comb tooth ring piece and a repair process for the surface coating of the comb tooth ring piece, and aims to solve the technical problems that the repair difficulty of the existing comb tooth ring piece is high, and a repair process and a corresponding protective fixture are not available.
The technical scheme adopted by the invention is as follows:
the utility model provides a protection anchor clamps are got rid of to labyrinth ring piece coating for get rid of the in-process and protect the position that need not to carry out the coating and get rid of on the labyrinth ring piece at labyrinth ring piece surface coating, the labyrinth ring piece is including all being the annular and along base member ring and the labyrinth ring that the axial links to each other, and the labyrinth of the outer anchor clamps of straining of labyrinth ring outer annular face is covered with the spraying layer, and protection anchor clamps include: the clamp comprises a clamp body, an upper cover body and an upper pressing assembly; the clamp body is vertically arranged, the lower end of the clamp body is used for being connected with the coating removing equipment, and the opposite upper end of the clamp body is used for supporting and positioning the grate ring piece; the upper cover body is connected to the upper end of the clamp body at intervals relatively so as to be matched with the clamp body to cover and protect a base body ring supporting the comb-tooth ring piece positioned on the clamp body; the upper pressing component is connected with the clamp body and is used for pressing and fixing the comb tooth ring extending out of the upper cover body on the clamp body downwards.
Furthermore, the clamp body comprises a shaft sleeve, a bottom plate arranged on the shaft sleeve, positioning plates arranged opposite to the bottom plate at intervals and a support post used for connecting the bottom plate and the positioning plates; the bottom plate is detachably connected with the coating removing equipment; the positioning plate is used for supporting and positioning the grate ring piece; the upper cover body is arranged opposite to the positioning plate and is connected with the positioning plate; the upper pressing component is vertically arranged, the lower end of the upper pressing component is connected with the positioning plate, and the opposite upper end of the upper pressing component penetrates through the upper cover body and then extends to the upper part of the upper cover body.
Furthermore, the positioning plate is provided with an annular mounting ring surface and a supporting ring surface which are sequentially arranged along the axial direction, the upper end surface of the positioning plate extends inwards to form a positioning groove, and the inner ring surface of the positioning groove forms a limiting ring surface; the mounting ring surface is used for supporting and limiting the upper cover body; the support ring surface is used for supporting the free end of the grate ring; the limiting ring surface is used for being attached to the outer ring surface of the positioning convex ring on the free end of the base ring so as to position the base ring.
Furthermore, the upper cover body comprises an upper cover in a circular cover shape and a baffle ring which is matched with the upper cover; the baffle ring is sleeved on the outer circle of the comb tooth ring and then supported on the upper end surface of the base body ring; the upper cover is arranged outside the baffle ring, the opening end of the upper cover is supported and connected on the positioning plate, the upper cover plate of the upper cover is provided with an opening for exposing the comb tooth ring, and the upper cover plate and the baffle ring are matched to form a sealing cover for sealing the upper end surface of the substrate ring.
Further, the upper pressing assembly comprises a pressing plate for pressing the grate ring downwards and a bolt component for mounting the pressing plate; the bolt component is vertically arranged, the lower end of the bolt component is connected with the positioning plate, and the opposite upper end of the bolt component extends outwards after penetrating through the upper cover body; the pressure plate is arranged on the excircle of the bolt component in a sliding manner and is used for propping against the upper end of the grate tooth ring under the action of the bolt component so as to press the grate tooth ring component on the positioning plate downwards.
According to another aspect of the invention, the invention also provides a repair process of the surface coating of the grate ring piece, which comprises the following steps: pre-testing the coating test piece by using a high-pressure water generating device to obtain a coating removal process parameter of the high-pressure water generating device; treating the comb tooth ring piece before formal repair: clamping and positioning the labyrinth ring piece to the labyrinth ring piece coating removal protection clamp after clamping the labyrinth ring piece coating removal protection clamp to the high-pressure water generation device; starting a high-pressure water generating device to remove the coating on the grate ring piece according to the coating removal process parameters; and re-spraying the spraying layer on the grate ring piece by adopting a plasma spraying process.
Further, the step of performing a pre-test on the coating test piece by using a high-pressure water generating device specifically comprises the following steps of: removing the coating on the coating test piece by using a high-pressure water generating device, and recording the actual value of the coating removal process parameter of the high-pressure water generating device; verifying the coating removal effect of the coating test piece and the influence of the coating test piece matrix; correcting the actual value of the coating removal process parameter according to the verification result to be used as the coating removal process parameter of the next test of the high-pressure water generating device; and repeating the steps until the optimized coating removal process parameters are obtained.
Further, the step of verifying the coating removal effect and the influence of the coating test piece matrix of the coating test piece specifically comprises the following steps: and (3) verifying the removal effect of the coating: sampling, carrying out microscopic metallographic detection and/or chromaticness treatment, and verifying the removal effect of the coating; and (3) verifying the influence of the coating test piece matrix: and detecting whether the size of the matrix of the coating test piece is changed or not through a micrometer and/or a microscopic metallographic phase.
Further, when the step of correcting the actual value of the coating removal process parameter according to the verification result is carried out, correcting the actual value of the coating removal process parameter by adopting an orthogonal method and/or a single variable comparison method; after the step of verifying the coating removal effect and the influence of the coating test piece matrix of the coating test piece, the method also comprises the following steps: and (5) re-spraying the coating test piece to detect whether the coating performance meets the design requirement.
Further, the optimized coating removal process parameters for removing the coating of the grate ring piece are as follows: water pressure: 2000-3000 bar, nozzle rotation speed: 800-1200 rpm, ejection distance: 30-50 mm.
The invention has the following beneficial effects:
when the grate ring shown in fig. 1 is installed on the grate ring coating removal protection clamp, firstly, the grate ring is supported and positioned at the upper end of the clamp body; then, relatively connecting the upper cover body to the top end of the clamp body, enabling the upper cover body and the clamp body to act in a matched mode, covering and protecting the base body ring of the comb-tooth ring piece in a protection cavity formed by enclosing the upper cover body and the clamp body, and enabling the comb-tooth ring of the comb-tooth ring piece to extend upwards out of the upper cover body; finally, the grate tooth ring piece is pressed and fixed on the clamp body through the upper pressing assembly, so that the installation and the positioning of the grate tooth ring piece and the sealing protection of the base body ring are realized, the base body ring which does not need to be subjected to coating removal on the grate tooth ring piece is not influenced by coating removal equipment, and the sealing grate tooth on the grate tooth ring is not interfered and damaged by the protective clamp and the coating removal equipment;
in the repair process of the surface coating of the labyrinth ring, the coating on the surface of the labyrinth ring is removed in a mode of jetting high-pressure water by a high-pressure water generating device, so that the coating on the surface of the part sealing labyrinth is completely removed, the size and the structure of a part matrix are not influenced, the part is ensured to reach the state before spraying, and the requirement of a design drawing is met; the protective fixture is removed through the coating of the labyrinth ring piece, so that other parts of the part are not impacted by water, the sealed labyrinth is not scratched by the fixture and a high-pressure water generating device, the part is convenient to fix and operate, and the stability in working is good; the high-pressure water jet technology is used for removing the coating, has the advantages of high efficiency, low cost, no damage to parts, convenient operation, safety, environmental protection and the like, solves the technical problem of removing and repairing the coating on the surface of the sealing labyrinth of the aero-engine, reduces the rejection rate of the parts and widens the repair process of the parts; the repair process is adopted to remove and repair the coating on the surface of the working outer ring of the sealing labyrinth on the surface of the aircraft engine, the process is stable, the sprayed coating on the surface of a part is detected to be completely removed, the size of the sealing labyrinth after repair meets the requirement of a design drawing, the size of the sealing labyrinth meets the requirement of the design drawing through trial run verification, and the design drawing and the use requirement are met; the process method is controllable in process, the repair process of the sealing labyrinth part of the aero-engine is created, the breakthrough of the repair technology of the sealing labyrinth part from 0 to 1 is realized, the scrappage is reduced, the machining efficiency is high, considerable economic benefits can be brought, and the process scheme can be popularized to the surface coating removal process of other sealing labyrinth structures of the aero-engine.
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 sectional front view of a grate ring;
FIG. 2 is a schematic structural view of a clamping and positioning of a labyrinth ring for a protective fixture for removing a coating of the labyrinth ring according to the preferred embodiment of the invention;
FIG. 3 is a schematic front view of the coating removal protective fixture of the labyrinth ring in FIG. 2;
FIG. 4 is a micrograph of a coating removal area on a coated test piece;
FIG. 5 is a microstructure of the re-sprayed spray coating;
FIG. 6a is a micrograph of an untreated coated coupon substrate;
FIG. 6b is a micrograph of the coated coupon substrate after high pressure water treatment;
FIG. 6c is a micrograph of the coated test piece substrate after sand blasting;
FIG. 6d is a micrograph of the sprayed coating after sand blasting of the coated test piece substrate;
FIG. 6e is a micrograph of a coated coupon being water de-coated under high pressure;
FIG. 7a is a topographical view of a ring gear before rework;
FIG. 7b is a diagram of the morphology of the grate ring after high pressure water de-coating.
Description of the figures
10. A grate-tooth ring piece; 101. spraying a layer; 11. a base ring; 111. positioning the convex ring; 12. a grate ring; 20. a clamp body; 21. a shaft sleeve; 22. a base plate; 23. positioning a plate; 231. mounting a torus; 232. a support annulus; 233. a limiting ring surface; 24. a pillar; 30. an upper cover body; 31. an upper cover; 32. a baffle ring; 40. an upper pressing assembly; 41. pressing a plate; 42. a bolt member; 421. a stud bolt; 422. locking the nut; 423. a compression nut; 424. and (7) capping.
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.
Referring to fig. 2 and 3, a preferred embodiment of the present invention provides a protecting jig for removing a coating of a labyrinth ring 10, which is used for protecting a portion of the labyrinth ring 10 that does not need to be coated during a process of removing the coating on a surface of the labyrinth ring 10, wherein the labyrinth ring 10 includes a base ring 11 and a labyrinth ring 12 that are both annular and are connected in an axial direction, a spray coating 101 is coated on a seal labyrinth on an outer annular surface of the labyrinth ring 12, and the protecting jig includes: the fixture body 20, the upper cover body 30 and the upper pressing assembly 40; the fixture body 20 is vertically arranged, the lower end of the fixture body is used for being connected with coating removing equipment, and the opposite upper end of the fixture body is used for supporting and positioning the grate ring piece 10; the upper cover body 30 is oppositely connected to the upper end of the clamp body 20 at intervals so as to cooperate with the clamp body 20 to cover and protect the base ring 11 of the comb-tooth ring 10 supported and positioned on the clamp body 20; the upper pressing component 40 is connected with the clamp body 20 and is used for pressing and fixing the comb-shaped ring 12 extending out of the upper cover body 30 on the clamp body 20 downwards.
When the grate ring 10 shown in fig. 1 is mounted on the grate ring coating removal protection clamp, firstly, the grate ring 10 is supported and positioned at the upper end of the clamp body 20; then, relatively connecting the upper cover body 30 to the top end of the clamp body 20, enabling the upper cover body 30 and the clamp body 20 to act in a matched mode, covering and protecting the base body ring 11 of the grid-tooth ring piece 10 in a protection cavity formed by enclosing the base body ring and the clamp body, and enabling the grid-tooth ring 12 of the grid-tooth ring piece 10 to extend upwards out of the upper cover body 30; finally, the grate ring piece 10 is pressed and fixed on the clamp body 20 through the upper pressing assembly 40 to press the grate ring piece 12 downwards, so that the installation and the positioning of the grate ring piece 10 and the sealing protection of the base body ring 11 are realized, the base body ring 11 which does not need coating removal on the grate ring piece 10 is not influenced by coating removal equipment, and the sealing grate on the grate ring 12 is not interfered and damaged by the protection clamp and the coating removal equipment.
Alternatively, as shown in fig. 3, the fixture body 20 includes a shaft sleeve 21, a bottom plate 22 mounted on the shaft sleeve 21, a positioning plate 23 disposed opposite to the bottom plate 22 at an interval, and a support column 24 for connecting the bottom plate 22 and the positioning plate 23. The sleeve 21 is used for clamping with a chuck on a workbench of the coating removing device, and plays a role in fastening and positioning. Base plate 22 is adapted to removably couple to the coating-removal device. The positioning plate 23 is used for supporting and positioning the grate ring piece 10. The plurality of support columns 24 are sequentially arranged at intervals along the circumferential direction and used for supporting the positioning plate 23, the clamp body 20 is designed into a structure that the positioning plate 23 and the bottom plate 22 which are arranged in parallel are connected through the plurality of support columns 24, the grate ring piece 10 can be lifted, and coating removing equipment can conveniently perform coating removing processing on the outer circumferential surface of the grate ring 12. The upper cover body 30 is arranged opposite to the positioning plate 23 and connected with the positioning plate 23; the upper pressing component 40 is vertically arranged, the lower end of the upper pressing component is connected with the positioning plate 23, and the opposite upper end of the upper pressing component penetrates through the upper cover body 30 and then extends to the upper part of the upper cover body 30.
In this alternative, as shown in fig. 2 and 3, the positioning plate 23 is provided with an annular mounting ring surface 231 and an annular supporting ring surface 232 which are sequentially arranged along the axial direction, the upper end surface of the positioning plate 23 extends concavely to form a positioning groove, and the inner ring surface of the positioning groove forms a limiting ring surface 233. When the upper cover 30 is connected to the positioning plate 23, the upper cover 30 is supported on the mounting ring 231 and detachably connected to the mounting ring 231 via a fastener, so that the mounting ring 231 is used to support and limit the upper cover 30. When the grate ring 10 is installed, the lower end of the base ring 11 of the grate ring 10 is supported on the support ring surface 232, so that the support ring surface 232 is used for supporting the free end of the grate ring 12. When the base ring 11 is supported on the support ring surface 232, the outer ring surface of the upper positioning convex ring 111 is attached to the limiting ring surface 233, so that the limiting ring surface 233 is used for attaching to the outer ring surface of the upper positioning convex ring 111 at the free end of the base ring 11 to position the base ring 11. The fixture body 20 is simple in structure, easy to mount and dismount, and the grate ring 10 is simple to mount and position and high in positioning accuracy.
Alternatively, as shown in fig. 2 and 3, the upper housing 30 includes an upper housing 31 in a shape of a circular cap, and a stopper ring 32 cooperating with the upper housing 31. The baffle ring 32 is sleeved on the outer circle of the grate ring 12 and then supported on the upper end surface of the base body ring 11; in this alternative, the baffle ring 32 may be an integral ring or may be formed by connecting a plurality of arc-shaped rings which are arranged along the circumferential direction. The upper cover 31 covers the baffle ring 32, the opening end of the upper cover is supported and connected to the positioning plate 23, the upper cover plate of the upper cover 31 is provided with an opening for exposing the comb-tooth ring 12, and the upper cover plate and the baffle ring 32 are matched to form a sealing cover for sealing the upper end surface of the base body ring 11. The upper cover 30 is simple in construction, easy to install and remove, and the enclosure to the base ring 11 is reliable, effectively preventing it from being affected by the coating removal equipment.
Preferably, as shown in fig. 3, an inward-concave limiting ring groove is formed on the inner plate surface of the upper cover plate, one end of the baffle ring 32 in the axial direction is clamped in the limiting ring groove, so that the baffle ring 32 is limited, and meanwhile, through the connection between the upper cover 31 and the positioning plate 23, the upper cover 31 can apply downward pressure on the baffle ring 32, so that the baffle ring 32 presses the base ring 11, thereby effectively preventing the grate-tooth ring 10 from shifting in the installation and working processes, and ensuring good installation and working stability of the grate-tooth ring 10; the outer plate surface of the upper cover plate is gradually inclined from the outer periphery to the middle, so that high-pressure water sprayed by the coating removing equipment can be effectively prevented from being sprayed to the outer periphery, and the high-pressure water can be guided to flow inwards into the clamp.
Alternatively, as shown in fig. 2 and 3, the upper press assembly 40 includes a press plate 41 for pressing the grate ring 12 downward, and a bolt member 42 for mounting the press plate 41. The bolt component 42 is vertically arranged, the lower end of the bolt component is connected with the positioning plate 23, and the opposite upper end of the bolt component extends outwards after penetrating through the upper cover body 30; in this alternative, bolt part 42 includes stud 421, threaded connection lock nut 422 and gland nut 423, block 424 on the stud 421 excircle, and stud 421 is vertical to be set up, and its bottom and locating plate 23 threaded connection just lock fixedly through lock nut 422. The pressure plate 41 is slidably arranged on the outer circle of the bolt component 42 and is used for abutting against the upper end of the grate ring 12 under the action of the bolt component 42 so as to press the grate ring component 10 downwards on the positioning plate 23; specifically, the pressing plate 41 is pressed down and locked by the pressing nut 423 while being shielded by the cap 424 covering the outside of the pressing nut 423. The upper pressing assembly 40 is simple in structure, easy to install and detach, stable and reliable in pressing down of the grate ring piece 10, capable of effectively preventing the grate ring piece 10 from shifting in the installation and working processes, and good in installation and working stability of the grate ring piece 10.
The invention also provides a repair process of the surface coating of the grate ring piece, which comprises the following steps:
pre-testing the coating test piece by using a high-pressure water generating device to obtain a coating removal process parameter of the high-pressure water generating device;
treating the comb tooth ring piece 10 before formal repair: after the grate ring coating removal protection clamp in any one of the above manners is clamped to a high-pressure water generating device, clamping and positioning the grate ring 10 to the grate ring coating removal protection clamp;
starting a high-pressure water generating device to remove the coating on the grate ring member 10 according to the coating removal process parameters;
and re-spraying the spray coating 101 on the grate ring member 10 by adopting a plasma spraying process.
When the water jet system works, the high-pressure water jet technology is to pressurize water to thousands of atmospheric pressures through a high-pressure water generating device and then convert the water into high-speed fine water jet through a jetting device with fine apertures, and the speed of the water jet is generally more than one Mach number, so that the water jet system has huge striking energy; then, the water flow acts on the surface of the object at a spiral high speed through the high-speed rotation of the spray gun to form a 'water milling cutter' effect, thereby achieving the aim of removing the coating. The invention adopts French Roselle high-pressure Water de-coating equipment, the model is Water jet 1500R, the medium is Water (industrial Water), the equipment mainly comprises a de-coating working chamber, a nozzle motion system (including a robot system), a rotary working table, a high-pressure Water pump, a Water circulation treatment system and the like, the invention adopts a spray gun with a five-hole nozzle, the inner diameter of the nozzle is 0.2mm, the five nozzles are distributed on a nozzle seat of phi 55, and the nozzle rotates by a round mandrel of the nozzle seat.
In the repair process of the surface coating of the labyrinth ring, the coating on the surface of the labyrinth ring 10 is removed in a mode of jetting high-pressure water by a high-pressure water generating device, so that the completely removed coating on the surface of the part sealing labyrinth is realized, the size and the structure of a part matrix are not influenced, the part is ensured to reach the state before spraying, and the requirement of a design drawing is met; the protective fixture is removed through the coating of the labyrinth ring piece, so that other parts of the part are not impacted by water, the sealed labyrinth is not scratched by the fixture and a high-pressure water generating device, the part is convenient to fix and operate, and the stability in working is good; the high-pressure water jet technology is used for removing the coating, has the advantages of high efficiency, low cost, no damage to parts, convenient operation, safety, environmental protection and the like, solves the technical problem of removing and repairing the coating on the surface of the sealing labyrinth of the aero-engine, reduces the rejection rate of the parts and widens the repair process of the parts; the repair process is adopted to remove and repair the coating on the surface of the working outer ring of the sealing labyrinth on the surface of the aircraft engine, the process is stable, the sprayed coating on the surface of a part is detected to be completely removed, the size of the sealing labyrinth after repair meets the requirement of a design drawing, the size of the sealing labyrinth meets the requirement of the design drawing through trial run verification, and the design drawing and the use requirement are met; the process method is controllable in process, the repair process of the sealing labyrinth part of the aero-engine is created, the breakthrough of the repair technology of the sealing labyrinth part from 0 to 1 is realized, the scrappage is reduced, the machining efficiency is high, considerable economic benefits can be brought, and the process scheme can be popularized to the surface coating removal process of other sealing labyrinth structures of the aero-engine.
Optionally, the step of performing a pre-test on the coating test piece by using a high-pressure water generator specifically includes the following steps:
removing the coating on the coating test piece by using a high-pressure water generating device, and recording the actual value of the coating removal process parameter of the high-pressure water generating device;
verifying the coating removal effect of the coating test piece and the influence of the coating test piece matrix;
correcting the actual value of the coating removal process parameter according to the verification result to be used as the coating removal process parameter of the next test of the high-pressure water generating device;
and repeating the steps until the optimized coating removal process parameters are obtained.
In the alternative, when the optimized coating removal process parameters are obtained by adopting the steps, the parameters are accurate, when the parameters are adopted for coating removal, the coating is completely removed, the removal efficiency is high, no damage is caused to a part substrate, and after the part coating is removed and sprayed again, the size of the part meets the requirements of design drawings and actual use.
Optionally, the step of "verifying the coating removal effect and the influence of the substrate of the coated test piece" specifically includes the following steps:
and (3) verifying the removal effect of the coating: sampling, carrying out microscopic metallographic detection and/or chromaticness treatment, and verifying the removal effect of the coating; during specific operation, sampling the coating test piece with the removed coating, performing microscopic metallographic detection, and detecting whether residues exist on the surface of the matrix of the coating test piece, wherein the detection result is shown in fig. 4, and the result shows that the coating of the test piece adopts a high-pressure water removal area, so that no coating residues exist, and the matrix has no abnormal change; and then the method of treating the coating removal surface by the chromatism at 580 ℃ is adopted, the color development is uniform, the coating is completely removed, and the effect of high-pressure water on the coating removal is obvious.
And (3) verifying the influence of the coating test piece matrix: detecting whether the size of the matrix of the coating test piece is changed or not through a micrometer and/or a microscopic metallographic phase; during specific operation, through a micrometer and microscopic metallographic examination (see fig. 6a and 6b), the size of the comb tooth ring matrix is unchanged and is consistent with the original size, and the size of the matrix is not influenced by multiple spraying (within 10 times); compared with the flat test piece roughened by a sand blowing process (fig. 6c, 6d and 6e), the influence of the high-pressure water parameter injection on the surface roughness of the comb ring base body is smaller than that of sand blowing, spraying is not influenced, and the matrix structure and the grain outline are not obviously influenced by adopting high-pressure water for coating removal.
Optionally, when the step of "correcting the actual value of the coating removal process parameter according to the verification result" is performed, the actual value of the coating removal process parameter is corrected by using an orthogonal method and/or a single variable comparison method. When the single variable contrast method is operated specifically, a coating test piece is protected by a half coating, a half coating is removed, and finally the coating removal effect is compared; and when the coating removal process parameters are corrected, one parameter is kept to be changed, and the rest parameters are kept unchanged. The color quality treatment refers to a treatment of heating in a heating furnace in an oxidizing atmosphere at a certain temperature for a certain time to discolor a part. Different materials have different colors, the colors displayed by the coating and the matrix at high temperature are different, and the high-pressure water can be used for judging whether the coating is completely removed or not by adopting color quality treatment. And (3) a color quality treatment process: the part must be clean before the chromaticness treatment, after the high-pressure water removes the coating, wash the surface that needs the chromaticness to observe, heat to 580 duC in the air electric stove and preserve heat for 1 hour, the furnace check, check the color difference of the surface of test piece.
Optionally, after the step of "verifying the coating removal effect and the influence of the coating test piece substrate" of the coating test piece, the method further comprises the steps of: and (5) re-spraying the coating test piece to detect whether the coating performance meets the design requirement. During specific operation, the repaired test piece is adopted to remove the residual coating on the surface, then the nickel aluminum/aluminum oxide coating is sprayed again, the test piece is cut to check the sprayed coating again, the structure shows that the structure of the coating is normal, and the performance of the coating meets the design requirement.
Optionally, the optimized coating removal process parameters for removing the coating of the grate ring member are as follows: water pressure: 2000-3000 bar, nozzle rotation speed: 800-1200 rpm, ejection distance: 30-50 mm. When the parameters are adopted for removing the coating, the coating is completely removed, the removing efficiency is high, the part substrate is not damaged, and after the part coating is removed and sprayed again, the size of the part meets the requirements of design drawings and actual use.
Optionally, the step "before formal rework of the ring grid member 10" specifically includes the following steps:
cleaning and deoiling: the surface of the grate ring member 10 is mainly cleaned by adopting a corresponding cleaning agent;
clamping protection: the grate ring coating removal protection clamp is clamped to a high-pressure water generating device, and then the grate ring 10 is clamped and positioned on the grate ring coating removal protection clamp.
Optionally, when the high-pressure water generating device is started to remove the coating on the labyrinth ring 10 according to the coating removal process parameters, firstly, the side face, the tooth tip and the tooth socket of the sealed labyrinth are respectively sprayed for 1-2 times, then, after the coating is removed completely, the moisture on the surface of the part is dried by compressed air, and then, the part is dried by an oven (60-100 ℃).
Optionally, the step of "spraying the sprayed layer 101 again on the grate ring member 10 by using the plasma spraying process" includes the following specific operations: visual inspection → cleaning → sand blasting protection → sand blasting (sand blasting plays a role in surface roughening, and the roughness before spraying is required to be more than Ra2.5, so that the coating bonding surface can be increased, and the coating bonding performance is improved) → spray protection → spraying → cleaning after coating → inspection.
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. The utility model provides a protection anchor clamps are got rid of to labyrinth ring spare coating, its characterized in that for get rid of the in-process at labyrinth ring spare (10) surface coating and protect the position that need not to carry out the coating and get rid of on labyrinth ring spare (10), labyrinth ring spare (10) are including all being the annular and along base ring (11) and the labyrinth ring (12) that axially link to each other, the labyrinth of obturating of the outer annular of labyrinth ring (12) is covered with spraying layer (101), and the protection anchor clamps include: the clamp comprises a clamp body (20), an upper cover body (30) and an upper pressing assembly (40);
the fixture body (20) is vertically arranged, the lower end of the fixture body is used for being connected with coating removing equipment, and the opposite upper end of the fixture body is used for supporting and positioning the grid tooth ring piece (10);
the upper cover body (30) is connected to the upper end of the clamp body (20) at an interval relatively so as to cooperate with the clamp body (20) to cover and protect the base body ring (11) of the comb-tooth ring (10) which is supported and positioned on the clamp body (20);
the upper pressing component (40) is connected with the fixture body (20) and is used for pressing and fixing the grate ring (12) extending out of the upper cover body (30) downwards on the fixture body (20).
2. The labyrinth ring coating removal protective fixture as claimed in claim 1,
the clamp body (20) comprises a shaft sleeve (21), a bottom plate (22) arranged on the shaft sleeve (21), positioning plates (23) arranged opposite to the bottom plate (22) at intervals, and a support column (24) used for connecting the bottom plate (22) and the positioning plates (23);
the bottom plate (22) is used for being detachably connected with the coating removing equipment;
the positioning plate (23) is used for supporting and positioning the grate ring piece (10);
the upper cover body (30) is arranged opposite to the positioning plate (23) and is connected with the positioning plate (23);
the upper pressing component (40) is vertically arranged, the lower end of the upper pressing component is connected with the positioning plate (23), and the opposite upper end of the upper pressing component penetrates through the upper cover body (30) and then extends to the upper part of the upper cover body (30).
3. The labyrinth ring coating removal protective fixture as claimed in claim 2,
an annular mounting ring surface (231) and a supporting ring surface (232) which are sequentially arranged along the axial direction are arranged on the positioning plate (23), the upper end surface of the positioning plate (23) extends inwards to form a positioning groove, and the inner ring surface of the positioning groove forms a limiting ring surface (233);
the mounting ring surface (231) is used for supporting and limiting the upper cover body (30);
the support ring surface (232) is used for supporting the free end of the grate ring (12);
the limiting ring surface (233) is attached to the outer ring surface of the positioning convex ring (111) at the free end of the base body ring (11) so as to position the base body ring (11).
4. The labyrinth ring coating removal protective fixture as claimed in claim 2,
the upper cover body (30) comprises a round cover-shaped upper cover (31) and a baffle ring (32) which is matched with the upper cover (31) for action;
the baffle ring (32) is sleeved on the outer circle of the comb tooth ring (12) and then supported on the upper end face of the base body ring (11);
the upper cover (31) is covered outside the baffle ring (32) and the opening end of the upper cover is connected to the positioning plate (23) in a supporting manner, an opening for exposing the comb tooth ring (12) is formed in the upper cover plate of the upper cover (31), and the upper cover plate and the baffle ring (32) are matched to form a sealing cover for sealing the upper end face of the base body ring (11).
5. The labyrinth ring coating removal protective fixture as claimed in claim 2,
the upper pressing assembly (40) comprises a pressing plate (41) for pressing the grate ring (12) downwards and a bolt component (42) for mounting the pressing plate (41);
the bolt component (42) is vertically arranged, the lower end of the bolt component is connected with the positioning plate (23), and the opposite upper end of the bolt component extends out after penetrating through the upper cover body (30);
the pressing plate (41) is arranged on the outer circle of the bolt component (42) in a sliding mode and used for abutting against the upper end of the grate ring (12) under the action of the bolt component (42) so as to press the grate ring (10) on the positioning plate (23) downwards.
6. The repair process of the surface coating of the grate ring piece is characterized by comprising the following steps of:
pre-testing the coating test piece by using a high-pressure water generating device to obtain a coating removal process parameter of the high-pressure water generating device;
treating the grate ring piece (10) formally before repair: clamping and positioning the labyrinth ring piece (10) onto the labyrinth ring piece coating removal protection clamp after clamping the labyrinth ring piece coating removal protection clamp to the high-pressure water generation device;
starting a high-pressure water generating device to remove the coating on the grate ring piece (10) according to the coating removal process parameters;
and (3) spraying the spraying layer (101) again on the grate ring piece (10) by adopting a plasma spraying process.
7. The repair process of the coating on the surface of the grate ring piece as claimed in claim 6, wherein the step of performing the pre-test on the coating test piece by using the high-pressure water generating device specifically comprises the following steps:
removing the coating on the coating test piece by using a high-pressure water generating device, and recording the actual value of the coating removal process parameter of the high-pressure water generating device;
verifying the coating removal effect of the coating test piece and the influence of the coating test piece matrix;
correcting the actual value of the coating removal process parameter according to the verification result to be used as the coating removal process parameter of the next test of the high-pressure water generating device;
and repeating the steps until the optimized coating removal process parameters are obtained.
8. The repair process of the coating on the surface of the grate ring piece as claimed in claim 7, wherein the step of verifying the coating removal effect and the influence of the substrate of the coating test piece specifically comprises the following steps:
and (3) verifying the removal effect of the coating: sampling, carrying out microscopic metallographic detection and/or chromaticness treatment, and verifying the removal effect of the coating;
and (3) verifying the influence of the coating test piece matrix: and detecting whether the size of the matrix of the coating test piece is changed or not through a micrometer and/or a microscopic metallographic phase.
9. The repair process of the surface coating of the grate ring piece as claimed in claim 7,
correcting the actual value of the coating removal process parameter by adopting an orthogonal method and/or a single variable comparison method when the step of correcting the actual value of the coating removal process parameter according to the verification result is carried out;
after the step of verifying the coating removal effect and the influence of the coating test piece matrix of the coating test piece, the method also comprises the following steps: and (5) re-spraying the coating test piece to detect whether the coating performance meets the design requirement.
10. The repair process of the surface coating of the grate ring piece as claimed in claim 7,
the optimized coating removal process parameters for removing the coating of the grate ring piece are as follows: water pressure: 2000-3000 bar, nozzle rotation speed: 800-1200 rpm, ejection distance: 30-50 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111349801.5A CN114054456B (en) | 2021-11-15 | 2021-11-15 | Protective fixture for removing coating of grate ring piece and repair process for coating on surface of grate ring piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111349801.5A CN114054456B (en) | 2021-11-15 | 2021-11-15 | Protective fixture for removing coating of grate ring piece and repair process for coating on surface of grate ring piece |
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| CN114054456B (en) | 2022-10-18 |
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