CN115537702A - Covering and grinding-polishing processing method for complex profile of turbine cold effect test blade - Google Patents
Covering and grinding-polishing processing method for complex profile of turbine cold effect test blade Download PDFInfo
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- CN115537702A CN115537702A CN202211225914.9A CN202211225914A CN115537702A CN 115537702 A CN115537702 A CN 115537702A CN 202211225914 A CN202211225914 A CN 202211225914A CN 115537702 A CN115537702 A CN 115537702A
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- 238000005507 spraying Methods 0.000 claims abstract description 58
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- 238000011282 treatment Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 21
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- 239000003960 organic solvent Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 239000010431 corundum Substances 0.000 claims description 7
- 238000007751 thermal spraying Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 6
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
-
- 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
- C23C4/129—Flame spraying
-
- 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
- C23C4/18—After-treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a covering and grinding-polishing processing method for a complex profile of a turbine cold effect test blade, which comprises the following steps: embedding a thermocouple; step two: shielding the blade; shielding a local area on the surface of the blade through a shielding protective layer; step three: cleaning the blades; cleaning the surface of the shielded blade, and performing sand blowing, blowing and cleaning treatment on the surface of the shielded blade; step four: spraying the surface of the blade; spraying a metal coating on the surface of the cleaned blade, covering the thermocouple, filling the channel with the metal coating, and detecting the resistance value and the insulation of the thermocouple; step five: polishing the surface of the blade; and removing the shielding protective layer on the surface of the blade, and polishing the metal coating protruding from the surface of the blade. The invention not only realizes the protection of the embedded thermocouple, realizes the accuracy and the stability of temperature measurement, but also keeps the original profile of the blade to the maximum extent and ensures that the profile structure of the blade meets the design requirement of cold efficiency.
Description
Technical Field
The invention relates to the technical field of cooling of turbine blades of gas engines, in particular to a covering and polishing processing method for complex profiles of turbine cold efficiency test blades.
Background
In order to improve the performance of the next generation aircraft engines, the compressor pressure ratio and the turbine inlet gas temperature need to be increased. With the increase of the temperature of the gas at the inlet of the turbine, the high-temperature parts of the engine need to bear larger heat load, so that the development of a micro-scale cooling technology on the basis of the traditional cooling technology is urgently needed, and stronger cooling and heat exchange effects are generated in unit area. The microscale super-strong cooling technology can provide a new technical approach for solving the bottleneck of cooling capacity of the turbine blade after the temperature of gas before the turbine is increased in the development process of an advanced engine. Aiming at the cooling design of the micro-scale ultra-cooling turbine blade, cold effect test verification needs to be carried out urgently, and the surface temperature of the blade is recorded so as to check whether the actual cooling effect meets the design requirement.
A turbine blade cold effect test is carried out, wherein a thermocouple lead channel is machined at a given section position on the surface of a blade in an electromachining mode, a thermocouple is buried, the thermocouple is covered in a proper mode, data are collected in a test state, and the surface temperature of the blade is recorded in a temperature measuring mode.
At present, the thermocouple of the conventional turbine cold test blade is covered by a layer of stainless steel sheet on the surface of the thermocouple lead along the way, and the stainless steel sheet is fixed by adopting a spot welding mode. However, for the micro-scale ultra-cooled turbine blade, due to the compact arrangement of the surface air film holes, the high-speed cooling air flow at the air film hole outlet is easy to cause the stainless steel sheet to warp or even fall off, so that the thermocouple is partially or completely exposed in the gas environment; because the distance between adjacent air film hole rows is small, the stainless steel sheet easily shields the air film hole opening, so that the cold air flow discharged from the air film hole is reduced; the unevenness of the blade profile is aggravated by the thickness of the stainless steel sheet material, and the flow field on the surface of the blade is changed. The real working environment of the cold effect test blade can be changed under the above conditions, so that the experimental temperature measurement result is inconsistent with the actual situation; therefore, a method for covering and polishing the complex profile of the turbine cold test blade is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a covering and grinding-polishing processing method for a complex profile of a turbine cold-efficiency test blade, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a covering and grinding-polishing processing method for a complex profile of a turbine cold-efficiency test blade, which comprises the following steps of:
the method comprises the following steps: embedding a thermocouple; a channel is arranged at a selected position of the blade, and a thermocouple is buried;
step two: shielding the blade; shielding a local area on the surface of the blade through the shielding protective layer, and detecting the resistance value and the insulation of the thermocouple after shielding is finished;
step three: cleaning the blades; cleaning the surface of the shielded blade, and performing sand blowing, blowing and cleaning treatment on the surface of the shielded blade;
step four: spraying the surface of the blade; spraying a metal coating on the surface of the cleaned blade, covering the thermocouple and filling the channel with the metal coating;
step five: polishing the surface of the blade; and removing the shielding protective layer on the surface of the blade, polishing the metal coating protruding from the surface of the blade, and then detecting the resistance value and the insulation of the thermocouple.
Preferably, in the second step, the shielding protective layer comprises a stainless steel sheet; the position of the shielding protective layer comprises a cold air inlet of the blade gas collecting box, a tail seam, a blade body air film hole and a cold air side thermocouple of the edge plate.
Preferably, in the third step, the sand blowing selects white corundum sand grains of 120 meshes to 220 meshes; the sand blowing pressure is 0.20MPa to 0.24MPa; the sand blowing direction is along the cold air outflow direction of the blades; the sand blowing distance is 6cm-10cm, and the sand blowing time is 0.5min-1min.
Preferably, in the third step, the cleaning is performed by using an organic solvent, and the organic solvent comprises acetone and alcohol.
Preferably, in the fourth step, the spraying program is compiled firstly in the spraying of the leaves; the technological parameters of the spraying equipment are that the flow of combustible gas is 300NLPM-700NLPM, the flow of oxygen is 70NLPM-320NLPM, the flow of shielding gas is 110NLPM-435NLPM, the powder output rate is 10g/min-55g/min, the distance of a spray gun is 100mm-300mm, and the spraying thickness is controlled to be 0.20mm +/-0.02 mm.
Preferably, the spraying equipment comprises a fixing component for fixing the blade and a spraying component for spraying the metal coating; the fixed assembly comprises a rotary base, the top end of the rotary base is rotatably connected with a rotary worktable, and a vice is fixedly mounted on the rotary worktable and used for clamping the blades; the spraying subassembly is including being used for carrying on the thermal spraying rifle of spraying, thermal spraying rifle fixed mounting is on the spraying support.
Preferably, in the fifth step, the polishing tool is a pneumatic polishing pen, and the polishing mode is manual polishing.
Preferably, the polishing head of the pneumatic polishing pen is made of corundum.
Preferably, in the fifth step, the thickness of the coating remained after the metal coating is polished is 0.08mm-0.12mm.
The invention discloses the following technical effects: the invention discloses a covering and polishing processing method for a complex profile of a turbine cold-efficiency test blade, which comprises the steps of shielding a local area of the surface of the blade, blowing sand and cleaning the surface of the shielded blade, spraying a metal coating at a position where a thermocouple is embedded in the surface of a blade runner, covering and fixing the thermocouple, and finally polishing the coating protruding out of the profile of the blade in a manual polishing mode to ensure continuous and smooth transition of the profile; the method mainly aims to ensure that the thermocouple embedded in the turbine cold-effect blade can effectively reflect the surface temperature of the blade in the test and can record the temperature measurement result in real time so as to analyze the average cooling effect of the surface of the blade; meanwhile, the original molded surface of the blade is not changed after the thermocouple is embedded, so that the mode that high-temperature gas and gas film cooling airflow flow through the surface of the blade in the test can meet the design requirement; the protection steel sheet that shelters from the protective layer need take off after the spraying is accomplished, can not shelter from the air film orifice and lead to the air film hole to flow out the air cooling volume and reduce, also can not aggravate the unevenness of blade profile, can not influence blade surface flow field. The invention not only realizes the protection of the embedded thermocouple, realizes the accuracy and the stability of temperature measurement, but also keeps the original profile of the blade to the maximum extent and ensures that the profile structure of the blade meets the design requirement of cold efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a schematic view of the spray coating device of the present invention;
FIG. 3 is a schematic view of the polishing apparatus of the present invention;
wherein, 1, a blade; 2. a rotating base; 3. a rotary table; 4. a vise; 5. a thermal spray gun; 6. spraying a bracket; 7. a pneumatic polishing pen; 8. polishing head; 9. a thermocouple; 10. a protection device; 11. a gas film hole; 12. measuring the cross section of the point; 13. a flange plate; 14. tenon tooth.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-3, the invention provides a covering and polishing processing method for a complex profile of a turbine cold-efficiency test blade, which comprises the following steps:
the method comprises the following steps: embedding a thermocouple 9; a channel is arranged at a selected position of the blade 1, and a thermocouple 9 is embedded;
step two: a shading blade 1; the local area of the surface of the blade 1 is shielded and protected through a shielding protective layer, and the resistance value and the insulation of the thermocouple 9 are detected after the shielding protective layer is finished;
step three: cleaning the blade 1; cleaning the surface of the blade 1 after the protective layer is shielded, and performing sand blowing, blowing and cleaning treatment on the surface of the blade 1 after the protective layer is shielded;
step four: spraying the surface of the blade 1; spraying a metal coating on the surface of the cleaned blade 1, covering the thermocouple 9 and filling the channel;
step five: polishing the surface of the blade 1; and removing the shielding protective layer on the surface of the blade 1, polishing the metal coating protruding from the surface of the blade 1, and then detecting the resistance value and the insulation of the thermocouple 9.
The invention discloses a covering and grinding-polishing processing method for a complex profile of a turbine cold-efficiency test blade, which is characterized in that a thermocouple lead channel and an embedded armored thermocouple are processed at the position of a given measuring point section 12 on the surface of a blade 1 in an electric processing mode, a thermocouple 9 is covered in a proper mode, data are collected in a test state, and the surface temperature of the blade is recorded in a temperature measuring mode; when the device is used, the local area of the surface of the blade 1 is shielded and protected, sand blowing and cleaning treatment is carried out on the surface of the blade 1 after the protective layer is shielded, a metal coating is sprayed at the position where the thermocouple 9 is embedded in the runner surface of the blade 1, the thermocouple 9 is covered and fixed, and finally the coating protruding out of the molded surface of the blade 1 is polished in a manual polishing mode to ensure continuous and smooth transition of the molded surface; the method mainly aims to ensure that a thermocouple 9 embedded in the turbine cold-effect blade 1 can effectively reflect the surface temperature of the blade 1 in the test and can record a temperature measurement result in real time so as to analyze the average cooling effect of the surface of the blade 1; meanwhile, the original molded surface of the blade 1 is not changed after the thermocouple 9 is buried, so that the mode that high-temperature gas and air film cooling airflow flow through the surface of the blade 1 in a test meets the design requirement is ensured.
Further, in the step one, grooving, adopting an electric machining mode, manufacturing a curve metal electrode adaptive to the thermocouple 9 according to a pre-designed on-way lead of the thermocouple 9, setting a proper electric machining parameter, and machining a lead channel which meets the embedding requirement of the thermocouple 9 on the blade, wherein the groove width is 0.55-0.60mm, and the groove depth is 0.5-0.6mm; when the thermocouple is buried, the metal section of the thermocouple 9 is straightened and stably placed into the lead groove channel and is uniformly pressed along the way; after embedding, primarily fixing the thermocouple 9 by using a curing adhesive (ethyl cyanoacrylate), dripping the curing adhesive into the thermocouple 9 at a distance of about 50mm, after solidification, welding the thermocouple 9 on two sides by using stainless steel wires in a contact resistance welding or laser spot welding manner, and finally fixing the thermocouple 9; the diameter of the stainless steel wire is 0.2mm, and the stainless steel wire is fixed at intervals of 2-10mm along the way; welding spots are positioned at two sides of the thermocouple 9 and cannot be positioned on the thermocouple 9, and during welding, the stainless steel wires are flattened to ensure that the stainless steel wires can contact and press the thermocouple 9; the welding starting point is 10 times of the diameter from the position of a thermocouple 9 measuring point; after the detection is finished, the thermocouple 9 is closely attached to the bottom surface of the channel through visual inspection, the position of a measuring point of the thermocouple 9 is closely attached to the top surface of the channel, the profile of the blade 1 is not obviously protruded along the way, and the resistance value and the insulativity of the thermocouple 9 are rechecked.
Further optimizing the scheme, in the second step, the shielding protective layer comprises a stainless steel sheet; the position of the shielding protective layer comprises a cold air inlet of the gas collecting box of the blade 1, a tail seam, a blade body air film hole 11 and a cold air side thermocouple 9 of a flange plate 13. The shielding protective layer on the surface of the blade 1 is usually made of stainless steel sheets, and is used for completely shielding the cold air inlet, the tail seam, the blade body air film hole 11 and the cold air side electric couples 9 of the edge plate 13, the shielding protective layer can be firmly fixed in a contact resistance welding or laser spot welding mode and is ensured to have no obvious crack, so that the sprayed metal coating is prevented from blocking the cold air inlet and outlet of the blade 1 or damaging the cold air side electric couples 9 of the edge plate 13; after the shielding protection layer is completed, the resistance value and the insulation of the thermocouple 9 are detected, and the measuring point is ensured to meet the temperature measurement requirement. If the measuring point is damaged, the thermocouple 9 at the position of the damaged measuring point is replaced in time, and the thermocouple survival rate is rechecked.
In the third step, the sand blowing selects white corundum sand grains of 120 meshes to 220 meshes; the sand blowing pressure is 0.20MPa to 0.24MPa; the sand blowing direction is along the cold air outflow direction of the blade 1; the sand blowing distance is 6cm-10cm, and the sand blowing time is 0.5min-1min. The sand blowing is that special sand blowing equipment is adopted, sand grains are sprayed on the surface to be sprayed of the blade 1 through a special nozzle by utilizing compressed air, and oil stains, rust, oxide scales, dirt and other stains on the surface of the blade 1 are removed by means of the impact force of the sand grains. The sand blowing time is not suitable to be too long, so that the thermocouple 9 is prevented from being damaged by the sand blowing effect; the sand blowing frequency is determined according to the surface cleaning effect of the blade 1, sand grains on the surface of the residual blade 1 are blown by compressed air after sand blowing, and air flow channels of the blade 1, such as an air film hole 11, are quickly communicated, so that no sand grains are left.
In the third step, an organic solvent is adopted for cleaning, and the organic solvent comprises acetone and alcohol. The surface and the interior of the blade 1 are cleaned by adopting an organic solvent, so that the subsequent spraying is ensured to be free from oil stains or dirt on the inner surface and the outer surface. Acetone and alcohol are commonly used organic solvents and are not described in detail herein.
Further optimizing the scheme, in the fourth step, spraying the blades 1 and writing a spraying program; the technological parameters of the spraying equipment are that the flow of combustible gas is 300NLPM-700NLPM, the flow of oxygen is 70NLPM-320NLPM, the flow of shielding gas is 110NLPM-435NLPM, the powder output rate is 10g/min-55g/min, the distance of a spray gun is 100mm-300mm, and the spraying thickness is controlled to be 0.20 +/-0.02 mm. Spraying a metal coating on the blade 1, namely spraying a part of the blade body of the blade 1 and the flow channel surface of the edge plate 13 without shielding protection by adopting supersonic flame spraying, wherein the spraying material is nickel-chromium carbide powder; firstly, writing a spraying program for the sprayed blade 1, wherein the writing requirement is to ensure that the effective part to be sprayed of the blade 1 can be uniformly covered with a coating; after the program is compiled, the blade 1 is placed on a rotary worktable 3 to perform program trial operation, so that the compiled program can cover all parts of the blade 1 to be sprayed; after the program is confirmed, the technological parameters in spraying are determined, wherein the flow rate of combustible gas is 300NLPM-700NLPM, the flow rate of oxygen is 70NLPM-320NLPM, the flow rate of shielding gas is 110NLPM-435NLPM, the powder output rate is 10g/min-55g/min, the distance of a spray gun is 100mm-300mm (adjusted according to the size of a blade 1), and spraying equipment can be operated after the parameters are confirmed. The sprayed metal coating is ensured to completely and uniformly cover the thermocouple 9 and fill the channel, and the spraying thickness of the metal coating is controlled to be 0.20mm +/-0.02 mm; the rest parts such as the edge plate 13 and the like can be lightly sprayed, the shielding protection state of the blade 1 is ensured to be normal in the spraying process, and the spraying is stopped and corresponding measures are taken to recover the normal shielding protection state if the blade falls off and the like; and after spraying, the covering condition of the thermocouple 9 is checked, and the insulation and resistance value of the thermocouple 9 are detected to ensure that the state of a measuring point is normal.
In a further optimized scheme, the spraying equipment comprises a fixing component for fixing the blade 1 and a spraying component for spraying a metal coating; the fixed assembly comprises a rotary base 2, the top end of the rotary base 2 is rotatably connected with a rotary worktable 3, a vice 4 is fixedly arranged on the rotary worktable 3, and the vice 4 is used for clamping the blade 1; the spraying assembly comprises a thermal spraying gun 5 for spraying, and the thermal spraying gun 5 is fixedly installed on a spraying support 6. The blade 1 is fixed on the rotary worktable 3 through the vice 4, and the rotary base 2 drives the blade 1 to rotate, so that the spraying without dead angles is convenient; the spraying process is a process that a spraying bracket 6 drives a thermal spraying gun 5 to move regularly at a certain distance from the blade 1, and molten metal particles sprayed from a spray gun of the spray gun cover the surface of the blade 1.
Furthermore, the spraying support 6 is a mechanical arm with at least three freedom degrees of movement, so that the spraying without dead angles is conveniently realized.
Further optimizing the scheme, in the fifth step, the polishing tool is a pneumatic polishing pen 7, and the polishing mode is manual polishing; the thickness of the residual coating after polishing the metal coating is 0.08mm-0.12mm; the polishing head 8 of the pneumatic polishing pen 7 is made of corundum. The surface of the blade 1 is polished by polishing the coating of the convex profile in a manual polishing mode, specifically, after the blade 1 is sprayed, a proper tool is adopted to remove the shielding protective layer, the metal coating on the surface of the shielding protective layer is polished preferentially according to the situation in the removing process, the area covering the thermocouple 9 is avoided during polishing, and the profile fluctuation caused by the uneven subsequent polishing amount is avoided; after the shielding protective layer is removed, a pneumatic polishing pen 7 is adopted, a manual polishing mode is utilized, the coating of the profile of the protruding blade 1 is polished, and the polishing head 8 is usually made of corundum. The rough grinding is mainly used in the early stage of grinding, the metal coating can be quickly ground to a thickness above a target thickness, then the fine grinding is carried out, the continuous smooth transition of the profile of the blade 1 is used as the target for the fine grinding, the grinding amount is particularly noticed in the grinding process, and the thermocouple 9 is prevented from being damaged or the profile is prevented from fluctuating due to transition grinding. The thickness of the coating remaining after sanding was 0.08mm to 0.12mm. The other parts such as the edge plate 13 and the like are only slightly polished by light. After polishing, the blade 1 ensures that no insulating layer of the thermocouple 9 is exposed, no gap exists between the measuring point position and the base body of the blade 1, pits and other abnormal conditions. And after polishing, the resistance value and the insulativity of the thermocouple 9 are detected again to ensure the survival rate of the measuring points.
The using method comprises the following steps:
referring to fig. 2, after partially shielding the surface of the blade 1 to which the thermocouple 9 is attached and performing treatments such as sand blasting, cleaning, and the like on the surface of the shielded blade 1, the tenon teeth 14 of the blade 1 are clamped and fixed to the vise 4 (the vise 4 is fixed to the rotary table 3 in advance) and the thermocouple 9 bundle is integrated into a disk shape and put into the protection device 10 of the thermocouple 9; and debugging the spraying program, and operating the spraying program after confirming the spraying parameters. The blade 1 will make a round trip rotary motion according to the form requirement on rotary table 3, and spraying support 6 will drive hot spraying gun 5 and move apart from blade 1 a certain position simultaneously, and the metal powder in hot spraying gun 5 receives spout high fever gas to erode the melting and then sprays to blade 1 surface and form the coating.
Referring to the attached drawing 3, after the metal coating is sprayed, the surface protecting layer of the blade 1 is removed, the sprayed metal coating is polished by the pneumatic polishing pen 7 according to the mode of the attached drawing 3, the polishing amount is particularly noticed in the polishing process, and damage to the thermocouple 9 or profile fluctuation caused by transition polishing or insufficient polishing is avoided.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A covering and grinding-polishing processing method for a complex profile of a turbine cold test blade is characterized by comprising the following steps:
the method comprises the following steps: embedding a thermocouple (9); a channel is arranged at a selected position of the blade (1), and a thermocouple (9) is buried;
step two: a shielding blade (1); shielding a local area on the surface of the blade (1) through a shielding protective layer, and detecting the resistance value and the insulation of the thermocouple (9) after shielding is finished;
step three: cleaning the blade (1); cleaning the surface of the shielded blade (1), and performing sand blowing, blowing and cleaning treatment on the surface of the shielded blade (1);
step four: spraying the surface of the blade (1); spraying a metal coating on the surface of the cleaned blade (1), covering the thermocouple (9) and filling the channel;
step five: polishing the surface of the blade (1); and removing the shielding protective layer on the surface of the blade (1), polishing the metal coating protruding from the surface of the blade (1), and then detecting the resistance value and the insulation of the thermocouple (9).
2. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 1, characterized by comprising the following steps: in the second step, the shielding protective layer comprises a stainless steel sheet; the position of the shielding protective layer comprises a cold air inlet of the gas collecting box of the blade (1), a tail seam, a blade body air film hole and a cold air side thermal couple (9) of the edge plate.
3. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 1, characterized by comprising the following steps: in the third step, the sand blowing selects white corundum sand grains of 120 meshes to 220 meshes; the sand blowing pressure is 0.20MPa to 0.24MPa; the sand blowing direction is along the cold air outflow direction of the blade (1); the sand blowing distance is 6cm-10cm, and the sand blowing time is 0.5min-1min.
4. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 3, characterized by comprising the following steps: in the third step, the cleaning adopts an organic solvent, and the organic solvent comprises acetone and alcohol.
5. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 1, characterized by comprising the following steps: in the fourth step, spraying the blades (1) and compiling a spraying program; the technological parameters of the spraying equipment are that the flow of combustible gas is 300NLPM-700NLPM, the flow of oxygen is 70NLPM-320NLPM, the flow of shielding gas is 110NLPM-435NLPM, the powder output rate is 10g/min-55g/min, the distance of a spray gun is 100mm-300mm, and the spraying thickness is controlled to be 0.20mm +/-0.02 mm.
6. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 5, characterized by comprising the following steps: the spraying equipment comprises a fixing component for fixing the blade (1) and a spraying component for spraying a metal coating; the fixed assembly comprises a rotary base (2), the top end of the rotary base (2) is rotatably connected with a rotary worktable (3), a vice (4) is fixedly installed on the rotary worktable (3), and the vice (4) is used for clamping the blades (1); the spraying assembly comprises a thermal spraying gun (5) for spraying, and the thermal spraying gun (5) is fixedly installed on a spraying support (6).
7. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 1, characterized by comprising the following steps: in the fifth step, the polishing tool is a pneumatic polishing pen (7), and the polishing mode is manual polishing.
8. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 7, characterized by comprising the following steps: the polishing head (8) of the pneumatic polishing pen (7) is made of corundum.
9. The covering and grinding-polishing processing method for the complex profile of the turbine cold-work test blade according to claim 7, characterized by comprising the following steps: in the fifth step, the thickness of the residual coating after the metal coating is polished is 0.08mm-0.12mm.
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| CN202211225914.9A CN115537702A (en) | 2022-10-09 | 2022-10-09 | Covering and grinding-polishing processing method for complex profile of turbine cold effect test blade |
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| CN202211225914.9A CN115537702A (en) | 2022-10-09 | 2022-10-09 | Covering and grinding-polishing processing method for complex profile of turbine cold effect test blade |
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Application publication date: 20221230 |