CN117181552A - Rebound spraying method and rebound spraying assembly for sealing teeth of sealing comb plate of aero-engine - Google Patents

Abstract

The invention discloses a rebound spraying method and a rebound spraying assembly for sealing teeth of a sealing comb plate of an aeroengine, wherein the rebound spraying method comprises the following steps: setting a first preset spraying point and a second preset spraying point, wherein the first preset spraying point is far away from the teeth to be sprayed and sealed, the second preset spraying point is close to the teeth to be sprayed and sealed, the rebound incidence angle of the first preset spraying point is smaller than that of the second preset spraying point, the spray gun is moved from the first preset spraying point to the second preset spraying point, and the angle-variable movement rebound spraying is carried out on the tooth back area of the teeth to be sprayed and sealed through the rebound plate. The rebound spraying processing is carried out on the tooth back area of the sealing tooth shielding area by controlling the movement path and the spraying angle of the spray gun, the control of the thickness of the rebound spraying coating can be effectively realized by adjusting the technological parameters such as the movement speed of the spray gun, the spraying residence time and the like, and the consistency of the spraying process of the parts is good, the processing repeatability is high, and the spraying efficiency is high.

Description

Rebound spraying method and rebound spraying assembly for sealing teeth of sealing comb plate of aero-engine

Technical Field

The invention relates to the technical field of surface treatment professional thermal spraying, in particular to a rebound spraying method and a rebound spraying assembly for sealing teeth of a sealing comb plate of an aero-engine.

Background

With the continuous development of aviation industry, the performance requirements of people on aeroengines are also continuously improved. In order to meet the requirements of low oil consumption, low cost, high reliability and durability of civil aviation engines, the structural design of the engines is continuously optimized and improved in the design and manufacturing processes, and new materials and new processes are used.

Seals on turbojet, turbofan engines are used to prevent leakage of oil from the engine bearing cavities, control cooling air flow and prevent the gas of the main air flow from entering the turbine disk cavity. The comb teeth sealing piece is widely used for sealing bearing lubricating oil, and is also used as a flow limiting device for controlling air flow in a compressor and a turbine part, and the quality of the sealing device directly influences the power, thrust and efficiency of an engine. For example, the sealing of the outer ring (namely the radial clearance of the blade tip) of the turbine is realized, and the efficiency loss of the turbine is increased by 1% -3% when the ratio of the clearance of the blade tip to the length of the blade is increased by 1% according to the design requirement. It can be seen that the sealing of the gas path is one of the important ways to improve efficiency and performance. In order to further improve the efficiency of the compressor and turbine, the loss of tip leakage is reduced. In this regard, the sealing tooth structure of the sealing comb plate can be designed with various structures and size shapes according to the requirements, and most of the tooth tips and tooth sides of the sealing comb plate are required to be sprayed with sealing coatings with certain thickness so as to achieve the aim of sealing an air path. The sealing coating can be used for ensuring that the sealing comb teeth have good airtight sealing effect on one hand; on the other hand, the sealing tooth base body is also used for protecting the sealing tooth base body, and the service life of the sealing comb tooth is prolonged. In the processing and manufacturing process of an aero-engine, in order to ensure that the comb tooth sealing structure has good gas sealing characteristics, a sealing coating is usually sprayed on the tooth tip and the tooth side of the sealing tooth, and the coating consists of an adhesive bottom layer and a surface layer. The bottom layer is generally a nickel-aluminum composite coating, and the surface layer is a gray alumina coating. The coating is attached to the sealing comb tooth area, and along with the high-speed rotation of the rotor, the corresponding parts are ground and cut like a grinding wheel, so that a proper fit clearance is formed, and the whole sealing system is guaranteed to operate well.

As shown in fig. 1a and 1b, which are structural and partial views of the sealing comb structure. When spraying the sealing coating on the spraying area 12 on the sealing teeth 11 on the inner side of the comb plate of the sealing comb tooth structure 1, the spraying on the tooth surface area 111 of the sealing teeth 11 is convenient, but because of the interference of the size and the shape of the parts, certain areas which are shielded by the appearance structure are limited by the spraying angle, if the direct spraying method shown in fig. 2 is adopted, the flame flow 14 of the plasma spray gun 13 cannot be effectively sprayed on the tooth back area 112 of the sealing teeth 11, so that the coating thickness and the coating metallographic structure of the tooth back area 112 often cannot meet the expected technical requirements.

Disclosure of Invention

The invention aims to overcome the defect that the area covered by the sealing teeth cannot be effectively sprayed in the prior art, and provides a rebound spraying method and a rebound spraying assembly for sealing teeth of a sealing comb plate of an aeroengine.

The invention solves the technical problems by the following technical scheme: a rebound spraying method for sealing teeth of a sealing comb plate of an aeroengine is characterized by comprising the following steps:

s10: spraying a bottom layer on the seal teeth;

s20: spraying a surface layer on the seal teeth;

the step S10 specifically includes the following steps:

s11: mounting a rebound plate into a groove of the sealing comb plate;

s12: setting a first preset spraying point and a second preset spraying point, wherein the first preset spraying point is far away from the sealing teeth, the second preset spraying point is close to the sealing teeth, the rebound incidence angle of the first preset spraying point is smaller than that of the second preset spraying point, moving a spray gun from the first preset spraying point to the second preset spraying point, and performing variable-angle moving rebound spraying on the tooth back area of the sealing teeth through the rebound plate;

the step S20 includes a step S21: setting a third preset spraying point and a fourth preset spraying point, wherein the third preset spraying point is far away from the sealing teeth, the fourth preset spraying point is close to the sealing teeth, the rebound incidence angle of the third preset spraying point is smaller than that of the fourth preset spraying point, moving a spray gun from the third preset spraying point to the fourth preset spraying point, and performing variable-angle moving rebound spraying on the tooth back area through a rebound plate.

In the scheme, the rebound plate is arranged in the groove of the sealing comb plate, the incident spraying angle of the spray gun and the rebound plate is arranged, the rebound spraying processing is carried out on the tooth back area of the sealing tooth shielding area by controlling the movement path and the spraying angle of the spray gun, the first rebound spraying point and the third rebound spraying point correspond to the tooth root position, the second rebound spraying point and the fourth rebound spraying point correspond to the tooth tip position, namely, when rebound spraying is carried out, the rebound spraying on the tooth root position is completed by slightly smaller rebound angle, and in the moving process of the spray gun, rebound flame flow gradually moves from the tooth root to the tooth tip, at this moment, the rebound spraying space is gradually widened, so that slightly larger rebound angle is adopted when rebound spraying is carried out on the tooth tip position, thereby uniform rebound coating thickness and good coating metallographic quality can be obtained, moreover, the control on the rebound coating thickness can be effectively realized by adjusting the technological parameters such as the spray gun moving speed, the consistency of the part spraying process is good, the processing repeatability is high, and the spraying efficiency is high.

Preferably, the rebound incidence angles of the first preset spraying point, the second preset spraying point, the third preset spraying point and the fourth preset spraying point are larger than or equal to 40 degrees and smaller than or equal to 70 degrees.

In the scheme, according to different tooth angles, the plasma spraying flame flow forms a certain scattering state, and the actual flame flow is biased, so that the high-quality coating quality can be obtained when the rebound incident angle is larger than or equal to 40 degrees and smaller than or equal to 70 degrees.

Preferably, the difference between the rebound incident angle of the first preset spraying point and the rebound incident angle of the second preset spraying point is less than or equal to 5 degrees;

and/or, the difference between the rebound incident angle of the third preset spraying point and the rebound incident angle of the fourth preset spraying point is smaller than or equal to 5 degrees.

In this scheme, through setting up first spraying point and second in advance to predetermine the spraying point rebound incident angle difference, can spray the rebound spraying of bottom through rebound board to the back of tooth region at different spraying point spray guns, further make the bottom spraying more even, the third is predetermine spraying point and fourth and predetermine the spraying point and make the surface course spraying more even, both satisfied the metallographic quality requirement of coating, satisfied the requirement that coating thickness evenly covers again.

Preferably, the rebound incident angle of the first preset spraying point and the rebound incident angle of the second preset spraying point are 55 degrees and 60 degrees respectively;

and/or the rebound incidence angle of the third preset spraying point and the rebound incidence angle of the fourth preset spraying point are respectively 45 degrees and 50 degrees.

In this scheme, through the experiment, this angle setting can further improve the homogeneity to the regional spraying of back of the tooth, is convenient for realize the thickness control to the rebound spraying coating, further improves the uniformity of the regional spraying process of back of the tooth, and spraying efficiency is high.

Preferably, the step S12 includes step S121: and adjusting the distance between the rebound board and the tooth back of the sealing tooth, and controlling the rebound spraying distance between 4 and 5 mm.

In this scheme, this distance setting can further improve the homogeneity to the regional spraying of back of the tooth, and the regional spraying process of back of the tooth's uniformity is good, and spraying efficiency is high.

Preferably, the step S21 includes step S211: and adjusting the distance between the rebound board and the tooth back of the sealing tooth, and controlling the rebound spraying distance to be 3-4 mm.

In this scheme, the flame flow of the spray gun of surface course is shorter than the bottom layer, and this distance setting can further improve the homogeneity to the regional spraying of back of the tooth, and the regional spraying process of back of the tooth's uniformity is good, and spraying efficiency is high.

Preferably, step S111 is further included between the step S11 and the step S12: and installing the compression ring into the groove of the sealing comb plate, so that the compression ring is abutted with the upper end surface of the rebound plate.

In this scheme, the clamping ring can be fixed the rebound board in the recess of the sealing comb fluted disc, guarantees the stability of rebound board when the spraying, prevents that the rebound board from being in the spraying processing time, because of the displacement that thermal deformation and flame flow strike and lead to changes.

Preferably, the step S10 includes a step S13: adjusting the spraying angle between the spray gun and the tooth surface of the seal tooth to be 85 degrees, and moving the spray gun to enable the moving range of flame flow of the spray gun to cover the spraying area of the tooth surface;

and/or, the step S20 includes a step S22: and (3) spraying the tooth surface of the seal tooth, adjusting the spraying angle between the spray gun and the tooth surface to 89 degrees, and moving the spray gun to enable the moving range of flame flow of the spray gun to cover the spraying area of the tooth surface.

In the scheme, through experiments, the spraying consistency is high and the coating is more uniform when the tooth surface area of the seal tooth is sprayed at the angle.

Preferably, the step S13 includes a step S131: and adjusting the spraying distance from the spray gun to the tooth surface to be between 95 and 100 mm.

In the scheme, the distance setting can further improve the uniformity of spraying the tooth surface area, the consistency of the spraying process of the tooth surface area is good, and the spraying efficiency is high.

Preferably, the step S22 includes step S221: and adjusting the spraying distance from the spray gun to the tooth surface to be 60-70 mm.

In this scheme, the flame flow of the spray gun of surface course is shorter than the bottom layer, and this distance setting can further improve the homogeneity to the regional spraying of flank of tooth, and the regional spraying process of flank of tooth's uniformity is good, and spraying efficiency is high.

Preferably, the step S10 includes step S14: adjusting the angle of the spray gun, and moving the spray gun to enable the spray gun to be over against the tooth tip area of the seal tooth for spraying;

and/or, the step S20 includes a step S23: and adjusting the angle of the spray gun, moving the spray gun to enable the spray gun to be opposite to the tooth tip region for spraying, and adjusting the spraying distance from the spray gun to the tooth tip of the sealing tooth to be 95-100 mm.

Preferably, before the step S10, the method further includes a step S100: and manufacturing rebound units according to the shape and the size of the grooves of the sealing comb plate, splicing the rebound units into rebound plates in the grooves, and reserving gaps between the rebound units.

In the scheme, the size and the size of the rebound board spliced by the rebound units can be well attached to the grooves, and gaps reserved between the rebound units can prevent the rebound board from being heated and extruded to deform when rebound spraying flame flows, so that the rebound effect of the rebound board is ensured.

The invention also discloses a rebound spraying assembly of the sealing teeth of the sealing comb plate of the aero-engine, which is used for the rebound spraying method.

Preferably, the seal tooth rebound spraying assembly comprises a rebound plate, wherein the rebound plate comprises at least two rebound units, and a gap is formed between every two adjacent rebound units.

In the scheme, gaps between the rebound units can prevent the rebound board from being heated and extruded to deform when rebound spraying flame flows, ensure the shape and the size of the rebound board to be matched with the grooves, and avoid uneven rebound spraying.

Preferably, the seal tooth rebound spraying assembly further comprises a pressing ring, wherein the pressing ring is arranged in a groove of the seal comb plate and is abutted to the upper end face of the rebound plate, and the pressing ring is in interference fit with the groove.

In the scheme, the compression ring is used for fixing the rebound unit in the groove of the sealing comb plate, so that displacement change caused by thermal deformation and flame flow impact during spraying processing of the rebound plate is prevented.

Preferably, the rebound plate is a teflon material.

In the scheme, the Teflon material has very remarkable rebound spraying effect, high spraying efficiency, uniform and controllable rebound spraying coating thickness and excellent coating metallographic quality.

The invention has the positive progress effects that: the rebound spraying processing of the tooth back area of the sealed tooth shielding area is realized by controlling the movement path and the spraying angle of the spray gun, the control of the thickness of the rebound spraying coating can be effectively realized by adjusting the technological parameters such as the movement speed of the spray gun, the spraying residence time and the like, and the consistency of the spraying process of the parts is good, the processing repeatability is high, and the spraying efficiency is high; the spraying processing of sealing the comb teeth in a narrow shielded area is realized, and the quality and the thickness of the coating after rebound spraying are adopted to completely meet the technical requirements of the quality of the related coating in a design drawing; the Teflon material is used as a rebound spraying auxiliary material, has very remarkable rebound spraying effect, high spraying efficiency, uniform and controllable rebound spraying coating thickness and can obtain excellent coating metallographic quality; the method is strong in universality, high in efficiency, practical and feasible, and has popularization and application values in spraying and processing of the sealing teeth of the aero-engine similar-structure comb plate.

Drawings

Fig. 1a is a structural view of a sealing comb structure in the prior art.

Fig. 1b is a partial structural view of a sealing comb structure in the prior art.

Fig. 2 is a schematic view showing a state of spraying a seal tooth in the prior art.

FIG. 3 is a flowchart of a rebound spraying method for sealing teeth of a sealing labyrinth plate according to a preferred embodiment of the present invention.

Fig. 4 is a schematic view of a movement track of a spray gun during spraying of seal teeth according to a preferred embodiment of the present invention.

Fig. 5 is a schematic structural view of a rebound board according to a preferred embodiment of the present invention.

Fig. 6 is a metallographic photograph showing rebound spraying of a seal tooth according to a preferred embodiment of the present invention.

Description of the reference numerals

Sealing comb tooth structure 1

Seal tooth 11

Tooth surface region 111

Back region 112

Tip region 113

Spray area 12

Spray gun 13

Flame flow 14

Rebound board 2

Rebound unit 21

Compression ring 3

Nickel aluminum bottom layer 4

Alumina surface layer 5

Groove 6

Spraying protection fixture 7

Detailed Description

The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.

As shown in fig. 1 a-6, the embodiment discloses a rebound spraying method for sealing teeth of a sealing comb of an aero-engine, which comprises the following steps:

s10: spraying the bottom layer of the sealing teeth 11;

s20: spraying a surface layer on the seal teeth 11;

the step S10 specifically includes the following steps:

s11: the rebound board 2 is installed in a groove 6 of the sealing comb plate;

s12: setting a first preset spraying point and a second preset spraying point, wherein the first preset spraying point is far away from the teeth 11 to be sprayed, the second preset spraying point is close to the teeth 11 to be sprayed, the rebound incidence angle of the first preset spraying point is smaller than that of the second preset spraying point, moving the spray gun 13 from the first preset spraying point to the second preset spraying point, and performing variable-angle moving rebound spraying on the back region 112 of the teeth 11 through the rebound board 2;

step S20 includes step S21: setting a third preset spraying point and a fourth preset spraying point, wherein the third preset spraying point is far away from the teeth 11 to be sprayed, the fourth preset spraying point is close to the teeth 11 to be sprayed, the rebound incidence angle of the third preset spraying point is smaller than that of the fourth preset spraying point, moving the spray gun 13 from the third preset spraying point to the fourth preset spraying point, and performing variable-angle moving rebound spraying on the tooth back area 112 through the rebound board 2.

The rebound plate 2 is arranged in the groove 6 of the sealing comb plate, the incident spraying angle of the spray gun 13 and the rebound plate 2 is set, the rebound spraying processing is carried out on the tooth back area 112 of the shielding area of the sealing tooth 11 by controlling the movement path and the spraying angle of the spray gun 13, the control on the thickness of the rebound spraying coating can be effectively realized by adjusting the technological parameters such as the movement speed of the spray gun 13, the spraying residence time and the like, the consistency of the part spraying process is good, the processing repeatability is high, and the spraying efficiency is high.

In this embodiment, the rebound incidence angles of the first preset spray point, the second preset spray point, the third preset spray point and the fourth preset spray point are greater than or equal to 40 ° and less than or equal to 70 °. According to the different tooth shape angles of the seal teeth 11, and because the plasma spraying flame flow 14 is in a certain scattering state, the actual flame flow 14 can be biased, and when the rebound incidence angle is more than or equal to 40 degrees and less than or equal to 70 degrees, the coating quality with better quality can be obtained. Of course, in other embodiments, other angles of bounce incident angle may be selected.

Specifically, as shown in fig. 4, when the back region 112 is subjected to rebound spraying, in this step, the initial spraying point is the E point, the final spraying point is the F point, the rebound incident angle of the rebound spraying of the spray gun 13 to the rebound board 2 is adjusted to 55 ° at the E point, 60 ° is set at the F point, the spray gun 13 is moved from the E point to the F point, the variable angle movement spraying is performed, and the rebound spraying processing of the back region 112 is completed, wherein in this step, the first preset spraying point is the E point, the second preset spraying point is the F point, i.e., the rebound incident angle of the first preset spraying point and the rebound incident angle of the second preset spraying point are 55 ° and 60 °, respectively. As shown in fig. 4, when the back region 112 is subjected to rebound spraying, in this step, the initial spraying point is point E, the final spraying point is point F, the rebound incidence angle of the rebound spraying of the spray gun 13 to the rebound board 2 is adjusted to 45 ° at point E, 50 ° is set at point F, the spray gun 13 is moved from point E to point F, the variable angle movement spraying is performed, and the rebound spraying processing of the back region 112 is completed, wherein in this step, the third preset spraying point is point E, the fourth preset spraying point is point F, that is, the rebound incidence angle of the third preset spraying point and the rebound incidence angle of the fourth preset spraying point are 45 ° and 50 °, respectively. Through the setting of the difference value of the rebound incidence angles of the first preset spraying point and the second preset spraying point, the spray gun 13 can spray the rebound of the bottom layer to the tooth back area 112 through the rebound board 2 at different spraying points, so that the bottom layer is sprayed more uniformly, and the third preset spraying point and the fourth preset spraying point are used for spraying the surface layer more uniformly.

Of course, in other embodiments, the initial spraying point may be set at point F, the final spraying point may be set at point E, the spray gun 13 may be moved from point F to point E, and the spray gun 13 may be moved from point F to point E to perform variable angle moving spraying, where the coating is sprayed onto the portion close to the tooth tip region 113, but because the space of the tooth back region 112 is relatively closed, the flame flow 14 gradually moves toward the tooth root region when moving from point F to point E, and at the same time, the spray flame flow of the rebound sputtering may be accelerated to gather toward the tooth root region, so that many unknown process defects may be caused to the rebound spraying inside the tooth back region 112, and the rebound space may become gradually smaller during the rebound spraying, so that the relevant interference of the rebound flame flow may be gradually aggravated, and the discharge of smoke dust and ineffective rebound spray particles during the rebound spraying is inconvenient, and uniform rebound coating thickness and good coating metallographic quality may not be obtained.

Of course, in other embodiments, other angles may be selected for the bounce incident angle of the first preset spray point, the bounce incident angle of the second preset spray point, the bounce incident angle of the third preset spray point, and the bounce incident angle of the fourth preset spray point, provided that the bounce incident angle of the first preset spray point is less than the bounce incident angle of the second preset spray point, and the bounce incident angle of the third preset spray point is less than the bounce incident angle of the fourth preset spray point.

In this embodiment, the difference between the rebound incident angle of the first preset spray point and the rebound incident angle of the second preset spray point and the difference between the rebound incident angle of the third preset spray point and the rebound incident angle of the fourth preset spray point are both 5 °, and in other embodiments, the difference between the rebound incident angles may be set between 0 ° and 5 °. The angle setting can further improve the uniformity of spraying the back of tooth region 112, is convenient for realizing the thickness control of rebound spraying coating, improves the uniformity of the back of tooth region 112 spraying process, and has high spraying efficiency.

Specifically, in this embodiment, the rotation speed of the sealing comb plate is set to 60 rpm during spraying, the plasma spray gun 13 is used for generating an ion arc heat source for performing plasma spraying processing on the sealing comb plate, the flame flow 14 of the spray gun 13 is a plasma spraying flame flow 14, and the spraying powder is heated to a molten or semi-molten state in the plasma flame flow 14 and is sprayed onto the surface of the sealing comb plate through the flame flow 14. Of course, in other embodiments, the rotation speed of the sealing comb plate during spraying can be set at other values between 40 and 120 rpm.

Before the sealing comb plate is formally sprayed, the optimal rebound distance and rebound angle between the rebound plate 2 and the tooth backs of the sealing teeth 11 are determined through experiments, and the rebound distance can be adjusted by cushioning adhesive tapes with different layers under the rebound plate 2.

In this embodiment, when the back region 112 is subjected to the primer coating, step S12 further includes step S121: the distance between the rebound board 2 and the back of the sealing teeth 11 is adjusted, and the rebound spraying distance is controlled between 4mm and 5 mm. The distance setting can further improve the uniformity of spraying the back of tooth region 112, and the consistency of the back of tooth region 112 spraying process is good, and the spraying efficiency is high.

In this embodiment, when the back region 112 is subjected to the primer coating, step S21 includes step S211: the distance between the rebound board 2 and the back of the sealing teeth 11 is adjusted, and the rebound spraying distance is controlled between 3mm and 4 mm. The flame flow 14 of the spray gun 13 of the surface layer is shorter than that of the bottom layer, the distance can further improve the uniformity of spraying the back of teeth region 112, the uniformity of the spraying process of the back of teeth region 112 is good, and the spraying efficiency is high.

As shown in fig. 4, in the present embodiment, step S111 is further included between step S11 and step S12: the pressing ring 3 is installed in the groove 6 of the sealing comb plate, so that the pressing ring 3 is abutted against the upper end face of the rebound plate 2. The compression ring 3 can fix the rebound board 2 in the groove 6 of the sealing comb plate, so that the rebound board 2 is ensured to be stable during spraying, and displacement change caused by thermal deformation and impact of flame flow 14 during spraying of the rebound board 2 is prevented.

In the case of performing the bottom coating on the tooth surface, as shown in fig. 4, in this step, the coating distance from the spray gun 13 to the tooth surface is adjusted to about 95-100mm, the coating angle between the spray gun 13 and the tooth surface is adjusted to about 85 °, the spray gun 13 is moved from the point a to the point B, so that the moving range of the flame flow 14 of the spray gun 13 can cover the coating area 12 of the tooth surface, and the coating of the tooth surface is completed, that is, step S10 further includes step S13: the spray angle of the spray gun 13 to the tooth surface of the seal tooth 11 is adjusted to about 85 °, and the spray gun 13 is moved so that the movement range of the flame flow 14 of the spray gun 13 covers the tooth surface region 111, and in other embodiments, the angle is preferably 85 °. Step S13 further includes step S131: the spraying distance from the spray gun 13 to the tooth surface is adjusted to be between 95 and 100mm, wherein the spraying distance is the distance from the spray gun 13 to the surface of the seal tooth 11.

When the surface layer is sprayed on the tooth surface, as shown in fig. 4, the spraying distance of the surface layer is set to be 60mm-70mm, the spraying angle between the spray gun 13 and the tooth surface is adjusted to be about 89 degrees, and under the spraying distance and angle, the spray gun 13 is moved from the point a to the point B to finish the spraying of the surface layer of the tooth surface, namely, the step S20 comprises the steps of: the tooth surface of the seal tooth 11 is sprayed, the spray angle between the spray gun 13 and the tooth surface is adjusted to about 89 °, and the spray gun 13 is moved so that the movement range of the flame flow 14 of the spray gun 13 covers the spray region 12 of the tooth surface, and in other embodiments, the angle is preferably 89 °. Step S22 further includes step S221: the spray distance from the spray gun 13 to the tooth surface is adjusted to be between 60 and 70 mm. The spraying consistency is high when the tooth surface region 111 of the seal tooth 11 is sprayed at the angle and the distance, the coating is more uniform, and the spraying efficiency is high.

As shown in fig. 4, when the bottom layer spraying is performed on the tooth tip, the angle of the spray gun 13 is adjusted to ensure that the spray gun 13 is just opposite to the tooth tip of the seal tooth 11, and the spray gun 13 is moved from point C to point D, so as to finish the spraying of the bottom layer of the tooth tip, namely, step S10 further includes step S14: adjusting the angle of the spray gun 13, and moving the spray gun 13 to enable the spray gun 13 to face the tooth tip area 113 of the seal tooth 11 for spraying; when the surface layer spraying is carried out on the tooth tip, the spraying is arranged between 60mm and 70mm, the posture of the spray gun 13 is adjusted, the spray gun 13 is opposite to the tooth tip of the seal tooth 11, the spray gun 13 is moved from the point C to the point D, and the spraying of the surface layer of the tooth tip is finished, namely, the step S20 further comprises the step S23: the angle of the spray gun 13 is adjusted, the spray gun 13 is moved to enable the spray gun 13 to spray the teeth tip area 113, and the spraying distance from the spray gun 13 to the teeth tip of the seal tooth 11 is adjusted to be 95-100 mm.

In the present embodiment, the spraying of the tooth surface region 111 is first performed, that is, the spray gun 13 is moved from the point a to the point B, so that the moving range of the flame flow 14 of the spray gun 13 can cover the tooth surface region 111; secondly, spraying the tooth tip region 113, namely, moving the spray gun 13 from the point C to the point D to finish spraying the bottom layer of the tooth tip region 113; and then spraying the back region 112, namely moving the spray gun 13 from the point E to the point F, and performing variable-angle moving spraying to finish rebound spraying processing of the back region 112.

The spraying of the tooth surface region 111 is performed preferentially, so that the influence on the tooth tip region 113 and the tooth back region 112 in the spraying process can be reduced to the greatest extent; secondly, after spraying the tooth surface region 111, spraying the tooth tip region 113, the flame flow 14 is equivalent to intangibly preheating the base material at the tooth back region 112, and when the preheated tooth back region 112 is sprayed again in a rebound manner, the combination of the base material and the coating of the tooth back region 112 is more facilitated, and meanwhile, due to the angle influence, the sprayed powder is basically not sputtered to the tooth back region 112. Of course, in other embodiments, the spraying sequence for the tooth face region 111, the tooth tip region 113, and the tooth back region 112 may be disordered, i.e., spraying may be performed in any combination of sequences.

As shown in fig. 4 and 5, in this embodiment, the method further includes a step of manufacturing a rebound board 2 before spraying, cutting a high temperature teflon board (polytetrafluoroethylene) for rebound according to the shape and size of the groove 6 area of the sealing labyrinth, selecting a high temperature resistant teflon board with a thickness of 5mm±1mm, cutting the teflon board into 8 rebound units 21, and then placing the cut teflon rebound units 21 in the groove 6 to splice into a circle, wherein when placing the teflon board, in order to prevent the teflon board from being deformed by thermal extrusion when rebounding the flame flow 14, the gap between every two adjacent rebound units 21 is controlled to be about 3mm, that is, step S100 is further included before step S10: and manufacturing rebound units 21 according to the shape and the size of the groove 6 of the sealing comb plate, splicing the rebound units 21 into the rebound plate 2 in the groove 6, and reserving gaps between the rebound units 21. The rebound boards 2 spliced by the rebound units 21 can be well attached to the grooves 6, and gaps reserved between the rebound units 21 can prevent the rebound boards 2 from being heated, extruded and deformed when the flame flow 14 is rebound, so that the rebound effect of the rebound boards 2 is ensured.

As shown in fig. 3 and 4, in particular, in the rebound spraying method for the sealing teeth of the sealing comb of the aeroengine provided by the invention, a series of detail steps are further included in step S10, and in particular, the following steps are further included before the rebound board 2 (step S11) composed of the rebound units 21 is placed:

s101, washing: cleaning or scrubbing the surface of the sealing comb plate to be sprayed to ensure that the surface is clean and free of pollutants such as greasy dirt and the like;

s102, a protection step: a spraying protection tool 7 or a high-temperature-resistant protection adhesive tape for spraying is adopted to protect a non-spraying area of the sealing comb plate, a plurality of layers of protection adhesive tapes can be stuck near the spraying area 12, wherein the spraying protection tool 7 is used for protecting the non-spraying area of the sealing comb plate to prevent overspray, and a high-temperature-resistant protection adhesive tape for plasma spraying can also be adopted to protect the non-spraying area;

s103, blowing sand: dry blowing sand is carried out on the surface of the area 12 to be sprayed, so that the surface to be sprayed is roughened, the adhesion of the coating is facilitated, and after blowing sand, surface sand grains are removed;

and the step of fixing the rebound unit after the placement of the rebound board 2 (S11) is further comprised of S111: after the rebound unit 21 is cut and placed, the metal compression ring 3 is installed through interference fit between the outer diameter of the metal compression ring 3 and the inner diameter of the groove 6 of the sealing comb plate, and is placed at the upper end of the rebound plate 2, and the metal compression ring 3 is used for fixing the rebound plate 2 in the groove 6.

S112, aligning the parts: and (3) placing the sealing comb plate (part) on a spraying positioning tool, and aligning the tool to ensure that the concentricity between the sealing comb plate and the turntable is within 1 mm. The positioning tool is used for being connected with a turntable of the spraying equipment, limiting, clamping and fixing the sealing comb plate on the tool, and guaranteeing reliable and accurate relative positions between the sealing comb plate and the spray gun 13 during spraying.

After the above steps are completed, the primer layer may be subjected to rebound spraying (step S12).

Furthermore, it is more preferable to further include a step of checking the rebound board 2 periodically after finishing the spraying of the bottom layer, which can be performed periodically, and the frequency of the specific implementation can be determined according to the use condition of the rebound unit 21, when it is found that the rebound unit 21 for rebound spraying is severely thermally deformed.

The invention also discloses a rebound spraying assembly for rebound spraying of the sealing teeth of the sealing comb plate of the aeroengine, which can be applied to the rebound spraying method.

The structure of the rebound spraying assembly is shown in fig. 5, the seal tooth 11 rebound spraying assembly comprises a rebound board 2, the rebound board 2 comprises at least two rebound units 21, and a gap is arranged between every two adjacent rebound units 21. The gap between the rebound units 21 can prevent the rebound board 2 from being heated, extruded and deformed when the flame flow 14 of the spray coating is rebounded, ensure the shape and the size of the rebound board 2 to be matched with the groove 6, and avoid uneven spray coating. In this embodiment, the rebound board 2 is formed by splicing eight rebound units 21, and the sizes of the eight rebound units 21 are consistent (the circumferential angle is slightly smaller than 45 °), so that uniform manufacturing and replacement are facilitated. Of course, in other embodiments, the rebound units 21 making up the rebound board 2 may be of other numbers than two to form a complete rebound board 2 by a combined orientation for ease of manufacture, maintenance and replacement.

As shown in fig. 4, the seal tooth 11 rebound spraying assembly further comprises a compression ring 3, wherein the compression ring 3 is arranged in the groove 6 of the seal comb plate and is abutted against the upper end face of the rebound plate 2, and the compression ring 3 is in interference fit with the groove 6. The compression ring 3 is used for fixing a rebound unit 21 in the groove 6 of the sealing comb plate, so that displacement change of the rebound plate 2 caused by thermal deformation and impact of flame flow 14 during spraying processing is prevented.

In this embodiment, the rebound board 2 is a teflon material (polytetrafluoroethylene). The Teflon material has very obvious rebound spraying effect, high spraying efficiency, uniform and controllable rebound spraying coating thickness and excellent coating metallographic quality.

As shown in fig. 6, the nickel aluminum bottom layer 4 and the aluminum oxide surface layer 5 after rebound spraying of the tooth back region 112 obtained by using the rebound assembly and the rebound method have good coating metallographic quality, completely meet the technical requirements of the relevant coating quality in the design drawing, have good consistency in the spraying process, high processing repeatability and high spraying efficiency, and the rebound spraying coating thickness is uniform and controllable.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims (16)

1. A rebound spraying method for sealing teeth of a sealing comb plate of an aeroengine is characterized by comprising the following steps:

s10: spraying a bottom layer on the seal teeth;

s20: spraying a surface layer on the seal teeth;

the step S10 specifically includes the following steps:

s11: mounting a rebound plate into a groove of the sealing comb plate;

s12: setting a first preset spraying point and a second preset spraying point, wherein the first preset spraying point is far away from the sealing teeth to be sprayed, the second preset spraying point is close to the sealing teeth to be sprayed, the rebound incidence angle of the first preset spraying point is smaller than that of the second preset spraying point, moving a spray gun from the first preset spraying point to the second preset spraying point, and performing variable-angle moving rebound spraying on the tooth back area of the sealing teeth through the rebound plate;

the step S20 includes a step S21: setting a third preset spraying point and a fourth preset spraying point, wherein the third preset spraying point is far away from the seal teeth to be sprayed, the fourth preset spraying point is close to the seal teeth to be sprayed, the rebound incident angle of the third preset spraying point is smaller than that of the fourth preset spraying point, moving a spray gun from the third preset spraying point to the fourth preset spraying point, and performing variable-angle moving rebound spraying on the tooth back area through a rebound plate.

2. The rebound spray method of claim 1 wherein the rebound incidence angle of the first, second, third and fourth preset spray points is greater than or equal to 40 ° and less than or equal to 70 °.

3. The rebound spray method of claim 1 wherein the difference in rebound incidence angle of the first predetermined spray point and the second predetermined spray point is less than or equal to 5 °;

and/or, the difference between the rebound incident angle of the third preset spraying point and the rebound incident angle of the fourth preset spraying point is smaller than or equal to 5 degrees.

4. A rebound spray method as claimed in claim 3, characterised in that the rebound incidence angle of the first predetermined spray point and the rebound incidence angle of the second predetermined spray point are 55 ° and 60 ° respectively;

and/or the rebound incidence angle of the third preset spraying point and the rebound incidence angle of the fourth preset spraying point are respectively 45 degrees and 50 degrees.

5. The rebound spraying method of claim 1, wherein the step S12 comprises a step S121 of: and adjusting the distance between the rebound board and the tooth back of the sealing tooth, and controlling the rebound spraying distance between 4 and 5 mm.

6. The rebound spraying method of claim 1, wherein the step S21 comprises a step S211 of: and adjusting the distance between the rebound board and the tooth back of the sealing tooth, and controlling the rebound spraying distance to be 3-4 mm.

7. The rebound spraying method according to claim 1, wherein between said step S11 and said step S12, further comprising step S111: and installing the compression ring into the groove of the sealing comb plate, so that the compression ring is abutted with the upper end surface of the rebound plate.

8. The rebound spraying method of claim 1, wherein the step S10 comprises a step S13 of: adjusting the spraying angle between the spray gun and the tooth surface of the seal tooth to be 85 degrees, and moving the spray gun to enable the moving range of flame flow of the spray gun to cover the spraying area of the tooth surface;

and/or, the step S20 includes a step S22: and (3) spraying the tooth surface of the seal tooth, adjusting the spraying angle between the spray gun and the tooth surface to 89 degrees, and moving the spray gun to enable the moving range of flame flow of the spray gun to cover the spraying area of the tooth surface.

9. The rebound spraying method of claim 8, wherein the step S13 comprises a step S131 of: and adjusting the spraying distance from the spray gun to the tooth surface to be between 95 and 100 mm.

10. The rebound spraying method of claim 8, wherein the step S22 comprises step S221: and adjusting the spraying distance from the spray gun to the tooth surface to be 60-70 mm.

11. The rebound spray method of claim 1, wherein the step S10 comprises a step S14 of: adjusting the angle of the spray gun, and moving the spray gun to enable the spray gun to be over against the tooth tip area of the seal tooth for spraying;

and/or, the step S20 includes a step S23: and adjusting the angle of the spray gun, moving the spray gun to enable the spray gun to be opposite to the tooth tip region for spraying, and adjusting the spraying distance from the spray gun to the tooth tip of the sealing tooth to be 95-100 mm.

12. The rebound spray method of claim 1, further comprising step S100 prior to said step S10: and manufacturing rebound units according to the shape and the size of the grooves of the sealing comb plate, splicing the rebound units into rebound plates in the grooves, and reserving gaps between the rebound units.

13. A rebound spray assembly for sealing teeth of a sealing labyrinth of an aircraft engine, characterized in that it is used in a rebound spray method according to claims 1-12.

14. The rebound spray assembly of claim 13 wherein the seal rebound spray assembly comprises a rebound plate comprising at least two rebound units with a gap between adjacent rebound units.

15. The rebound spray assembly of claim 14 wherein the seal rebound spray assembly further comprises a compression ring disposed within the recess of the seal labyrinth and abutting the upper face of the rebound plate, the compression ring being in interference fit with the recess.

16. The rebound spray assembly of claim 14, wherein the rebound plate is a teflon material.