CN113977109B - Processing method of aeroengine fingertip sealing plate - Google Patents
Processing method of aeroengine fingertip sealing plate Download PDFInfo
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- CN113977109B CN113977109B CN202111535212.6A CN202111535212A CN113977109B CN 113977109 B CN113977109 B CN 113977109B CN 202111535212 A CN202111535212 A CN 202111535212A CN 113977109 B CN113977109 B CN 113977109B
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- 238000007789 sealing Methods 0.000 title claims abstract description 129
- 238000003672 processing method Methods 0.000 title claims abstract description 9
- 238000001179 sorption measurement Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000003584 silencer Effects 0.000 claims description 6
- 239000012720 thermal barrier coating Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 6
- 238000007373 indentation Methods 0.000 abstract description 6
- 238000003754 machining Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 208000014674 injury Diseases 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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Abstract
The invention discloses a processing method of an aeroengine fingertip sealing sheet, which comprises the following steps: installing and positioning the fingertip sealing sheet raw material to be processed by adopting an air source vacuum adsorption positioning mode; cutting and processing are carried out on the fingertip sealing sheet raw material to be processed according to a preset scanning and processing track by adopting an ultrafast laser galvanometer scanning mode and combining a vacuum environment auxiliary process, wherein the preset scanning and processing track comprises the following components: firstly, cutting and processing a fingertip wire slot of the fingertip sealing piece in a mode of controlling processing according to 9 sections of wire distribution deformation, then cutting and processing an outer circle of the fingertip sealing piece, and finally cutting and processing an inner circle of the fingertip sealing piece. The high-quality processing of the fingertip sealing piece can be realized, so that the fingertip sealing piece is smooth, has no warpage and deformation, has no burrs on the kerf surface, has no sliding damage, indentation and crack on the fingertip sealing piece surface, and greatly improves the processing quality of the fingertip sealing piece surface.
Description
Technical Field
The invention belongs to the field of special processing, and particularly relates to a processing method of an aeroengine fingertip sealing sheet.
Background
At present, the aeroengine seal is one of important engineering problems of the engine, and the fingertip seal is a novel device which can be used for sealing a main bearing cavity of the aeroengine and sealing an airflow flow path, and is formed by alternately arranging and connecting sealing sheets consisting of a plurality of cantilever fingertip beams. The fingertip wire grooves of the fingertip sealing sheets adopt involute, logarithmic spiral and other forms. For processing the fingertip sealing sheet (figure 1), the requirements are extremely high, involute or logarithmic spiral narrow grooves with the size and position precision of 0.3mm are processed on a sheet with the size of 0.25mm, the groove size and position precision of 0.03mm are not changed, remelting layers are not formed after processing, the roughness Ra < 0.8 mu m is required to be flat, the parts are not allowed to warp and deform, the surfaces of the parts are not allowed to have any sliding damage, indentation and crack, burrs are not allowed to exist on the surfaces of the kerfs, and the processing difficulty is high.
Aiming at the technical problems, the machining methods such as wire-cut electric discharge machining, long pulse laser, mechanical machining and the like and the positioning device thereof cannot meet the machining technical requirements. In order to realize high-precision and high-quality machining of the special-shaped hole groove of the high-precision part of the aero-engine, development of a machining method of the fingertip sealing piece of the aero-engine is needed.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a processing method of an aeroengine fingertip sealing piece, which can realize high-quality processing of the fingertip sealing piece, so that the fingertip sealing piece is smooth, has no warpage and deformation, has no burrs on the kerf surface, has no sliding injury, indentation and crack on the fingertip sealing piece surface, and greatly improves the processing quality of the fingertip sealing piece surface.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a processing method of an aeroengine fingertip sealing plate comprises the following steps:
installing and positioning the fingertip sealing sheet raw material to be processed by adopting an air source vacuum adsorption positioning mode;
cutting and processing are carried out on the fingertip sealing sheet raw material to be processed according to a preset scanning and processing track by adopting an ultrafast laser galvanometer scanning mode and combining a vacuum environment auxiliary process, wherein the preset scanning and processing track comprises the following components: firstly, cutting and processing a fingertip wire slot of the fingertip sealing piece in a mode of controlling processing according to 9 sections of wire distribution deformation, then cutting and processing an outer circle of the fingertip sealing piece, and finally cutting and processing an inner circle of the fingertip sealing piece.
Further, in the air source vacuum adsorption positioning mode, the air source pressure is 0.6 MPa-1.5 MPa; the vacuum pressure is-0.1 MPa to 0MPa.
Further, the processing parameters of the ultra-fast laser galvanometer scanning mode include: the pulse width of the ultrafast laser is 50 fs-300 fs; the pulse frequency of the ultrafast laser is 50 kHz-200 kHz; the ultrafast laser power is 5W-20W.
Further, the processing parameters of the ultra-fast laser galvanometer scanning mode further include: the defocusing amount is-1 mm; the incident angle is 45-90 degrees.
Further, the vacuum degree of the vacuum environment auxiliary process is 100Pa.
Further, the method for installing and positioning the fingertip sealing sheet raw material to be processed by adopting the air source vacuum adsorption positioning mode specifically comprises the following steps:
the device comprises an air source, a handle switch, a regulating valve, an electromagnetic valve, a vacuum generator and a tool sucker, wherein the air source input port is formed in the side face of the tool sucker, a vacuum adsorption outer circular groove corresponding to the outer circle of the fingertip sealing piece and a vacuum adsorption inner circular groove corresponding to the inner circle of the fingertip sealing piece are formed in one end face of the tool sucker, the vacuum adsorption outer circular groove is communicated with the air source input port, the air source input port is connected with one end of the vacuum generator, the other end of the vacuum generator is connected with one end of the electromagnetic valve, the other end of the electromagnetic valve is connected with one end of the regulating valve, the other end of the regulating valve is connected with one end of the handle switch, and the other end of the handle switch is connected with the air source.
Further, the air source adsorption device also comprises a silencer and a vacuum filter, and the silencer is connected with the vacuum generator; the vacuum filter is arranged between the vacuum generator and the tool sucker, one end of the vacuum filter is connected with one end of the vacuum generator, and the other end of the vacuum filter is connected with the air source input port.
Further, the air source adsorption device further comprises a vacuum gauge, and the vacuum gauge is installed on the tool sucker and used for measuring the vacuum pressure.
Further, an outer circular ring sealing strip is arranged on two sides of the vacuum adsorption outer circular ring groove on one end face of the tool sucker, and an inner circular ring sealing strip is arranged on two sides of the vacuum adsorption inner circular ring groove on one end face of the tool sucker.
Further, the tool sucker is provided with a mounting hole for being connected with the equipment workbench, and one end face of the tool sucker is further coated with a thermal barrier coating.
Compared with the prior art, the invention has at least the following beneficial effects: according to the processing method of the aircraft engine fingertip sealing piece, provided by the invention, the raw material of the fingertip sealing piece to be processed is positioned in a gas source vacuum adsorption positioning mode, the surface of the fingertip sealing piece is not required to be clamped, the surface of the fingertip sealing piece is smooth, free of sliding injury, free of indentation and crack, and the surface quality of the fingertip sealing piece is greatly improved through high-quality and damage-free positioning. The method comprises the steps of firstly cutting and processing the fingertip wire groove of the fingertip sealing piece according to a mode of 9-section line distribution deformation control processing by adopting an ultrafast laser galvanometer scanning mode and according to a preset scanning processing track, then cutting and processing the outer circle of the fingertip sealing piece, and finally cutting and processing the inner circle of the fingertip sealing piece to realize laser precise fine high-precision and high-quality processing of no warpage and no deformation of the fingertip sealing piece, no remelting layer, no burr, no crack and low roughness of the fingertip wire groove (involute groove and logarithmic spiral groove).
Further, in the air source vacuum adsorption positioning mode, the air source pressure is 0.6 MPa-1.5 MPa; the vacuum pressure is-0.1 MPa to 0MPa, and the required gas pressure supply device is simple and easy to obtain under the pressure, so that the efficiency is improved and the cost is saved.
Further, the ultrafast laser pulse width is 50 fs-300 fs, and the processing quality requirement is met. The ultra-fast laser pulse frequency is 50 kHz-200 kHz, the enhancement effect of vacuum on the self-focusing length of the femtosecond laser depends on the laser repetition frequency, the threshold value of the femtosecond laser processing material is reduced in a high repetition frequency vacuum environment, and the processing efficiency is improved. The ultra-fast laser power is 5W-20W, and the laser with the ultra-fast laser power has strong economical efficiency and meets the processing quality requirement.
Further, the processing parameters of the ultra-fast laser galvanometer scanning mode further comprise: the defocusing amount is-1 mm, the incident angle is 45-90 degrees, and the laser beam cutting forming taper and the part profile deformation during scanning can be effectively controlled.
Further, the processing is performed under the vacuum degree of 100Pa, a vacuum auxiliary processing technology is adopted, under the vacuum environment, the loss caused by ionization in the laser propagation is weakened, meanwhile, the light guide is enhanced, and larger laser pulse energy can be adopted. Because the air pressure of the vacuum environment is extremely low, the laser ablation product is vaporized and erupted more efficiently, and the efficiency is obviously improved. Meanwhile, the processing surface has no phenomena of ablation, discoloration, buckling deformation and the like in a vacuum environment, the processing quality is improved, and the efficient high-quality processing is realized under the vacuum degree of 100Pa.
Further, an air source vacuum adsorption positioning mode is adopted to mount and position the fingertip sealing sheet raw material to be processed, during adsorption operation, an air source is connected with an air path, a handle switch is turned on, a pressure value is regulated through a pressure regulating valve, when an electromagnetic valve is electrified, compressed air (air source) enters a vacuum generator, and after the vacuum generator works, the compressed air is input from an air source input port, so that vacuum is generated in a cavity of a tool sucker, the lowest vacuum degree is achieved, the outer circle of the fingertip sealing sheet is adsorbed by a vacuum adsorption outer circular groove, the inner circle of the fingertip sealing sheet is adsorbed by a vacuum adsorption inner circular groove, and the fingertip sealing sheet raw material to be processed is tightly attached to the tool sucker under the action of pressure difference between the inner and outer sides of the tool sucker; when the operation is relaxed, when the solenoid valve is powered off, compressed air (air source) cuts off, and under the condition that no compressed air (air source) is input, frock sucking disc releases the fingertip sealing piece raw materials of waiting to process very fast, and this structure convenient operation adsorbs effectually.
Further, the air source adsorption device also comprises a silencer and a vacuum filter, and noise is eliminated through the silencer, so that noise pollution is avoided. And filtering pollutants in the gas through a vacuum filter to ensure the surface of the part to be clean and flat.
Further, the air source adsorption device further comprises a vacuum gauge, and the vacuum pressure value is determined through the vacuum gauge, so that accurate control is facilitated.
Further, the two sides of the tool sucker, which are positioned on the end face of the tool sucker and are positioned on the vacuum adsorption outer circular groove, are provided with outer circular ring-shaped sealing strips, and the two sides of the tool sucker, which are positioned on the end face of the tool sucker and are positioned on the vacuum adsorption inner circular groove, are provided with inner circular ring-shaped sealing strips, so that the tight adsorption effect is better.
Further, the tool sucker is provided with a mounting hole for being connected with the equipment workbench, so that the installation is convenient. A thermal barrier coating is further coated on one end face of the tool sucker, so that the tool sucker is prevented from being damaged due to heat accumulation in the machining process.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a raw material for a fingertip seal to be processed;
FIG. 2 is a schematic view of a process for manufacturing a fingertip seal;
FIG. 3 is a schematic diagram of an air source adsorption device according to the present invention;
FIG. 4 is a top view of the tooling suction cup of the present invention;
FIG. 5 is a front cross-sectional view of the tooling suction cup of the present invention;
FIG. 6 is a side cross-sectional view of the tooling suction cup of the present invention;
FIG. 7 is a schematic illustration of a fingertip seal;
fig. 8 is an enlarged partial schematic view of a fingertip seal.
In the figure: 1-an air source; 2-a handle switch; 3-regulating valve; 4-an electromagnetic valve; 5-a vacuum generator; 6-muffler; 7-a vacuum filter; 8-a vacuum gauge; 9-a tool sucker; 901-an air source input port; 902-vacuum adsorbing an outer ring groove; 903-vacuum adsorbing the inner circumferential groove; 904-an outer annular sealing strip; 905-inner circular ring seal strip; 906-mounting holes; 907-a thermal barrier coating; 10-fingertip sealing sheet raw material; 11-fingertip sealing sheet.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As a specific embodiment of the present invention, referring to fig. 1 to 6, a processing method of an aeroengine fingertip sealing sheet specifically includes:
and the fingertip sealing sheet raw material 10 to be processed is installed and positioned in a vacuum adsorption positioning mode by adopting an air source. Preferably, in the air source vacuum adsorption positioning mode, the air source pressure is 0.6 MPa-1.5 MPa; the vacuum pressure is-0.1 MPa to 0MPa. The fingertip sealing piece raw material to be processed is positioned in a gas source vacuum adsorption positioning mode, so that the fingertip sealing piece is smooth in surface, free of sliding injury, free of indentation and free of crack, namely, the surface quality of the fingertip sealing piece is greatly improved through high-quality and damage-free positioning.
Specifically, the invention installs and positions the fingertip sealing sheet raw material to be processed through the multi-point air source adsorption device, and the fingertip sealing sheet raw material to be processed is fixed on a machine tool workbench through the multi-point air source adsorption device. As shown in fig. 3 to 6, the air source adsorption device comprises an air source 1, a handle switch 2, a regulating valve 3, an electromagnetic valve 4, a vacuum generator 5 and a tool sucker 9, wherein an air source input port 901 is formed in the side surface of the tool sucker 9, a vacuum adsorption outer circular groove 902 corresponding to the outer circle of a fingertip sealing piece and a vacuum adsorption inner circular groove 903 corresponding to the inner circle of the fingertip sealing piece are formed in one end surface of the tool sucker 9, preferably, outer circular ring sealing strips 904 are arranged on two sides of the vacuum adsorption outer circular groove 902 on one end surface of the tool sucker 9, inner circular ring sealing strips 905 are arranged on two sides of the vacuum adsorption inner circular groove 903 on one end surface of the tool sucker 9, and the vacuum adsorption effect is ensured to be more reliable through the sealing strips. The vacuum adsorption outer circular groove 902 and the vacuum adsorption inner circular groove 903 are communicated with the air source input port 901, the air source input port 901 is connected with one end of the vacuum generator 5, the other end of the vacuum generator 5 is connected with one end of the electromagnetic valve 4, the other end of the electromagnetic valve 4 is connected with one end of the regulating valve 3, the other end of the regulating valve 3 is connected with one end of the handle switch 2, and the other end of the handle switch 2 is connected with the air source 1.
The working principle of the air source adsorption device is as follows: when the adsorption operation is performed, the air source 1 is connected with the air path, the handle switch 2 is opened, the pressure value is regulated through the pressure regulating valve 3, when the electromagnetic valve 4 is electrified, compressed air (air source) enters the vacuum generator 5, and after the vacuum generator 5 works, the compressed air is input from the air source input port 901, so that vacuum is generated in the cavity of the tool sucker 9, the lowest vacuum degree is achieved, the outer circle of the fingertip sealing piece is adsorbed by the vacuum adsorption outer circular groove 902, the inner circle of the fingertip sealing piece is adsorbed by the vacuum adsorption inner circular groove 903, namely, the raw material of the fingertip sealing piece to be processed is tightly attached to the tool sucker under the action of the pressure difference between the inner and outer parts of the tool sucker 9; when the operation is relaxed, when the electromagnetic valve 4 is powered off, the compressed air (air source) is blocked, and under the condition that no compressed air (air source) is input, the tool sucker 9 quickly releases the raw material of the fingertip sealing plate to be processed.
For example, when solenoid valve 4 is energized, compressed air (air source) gets into vacuum generator 5, and vacuum generator 5 work makes frock sucking disc intracavity produce the vacuum to reach minimum vacuum, the frock sucking disc closely laminates under the effect of inside and outside pressure differential and adsorbs the fingertip sealing piece raw materials that wait to process, at ultrafast laser galvanometer scanning cutting's in-process, keeps closely adsorbing the state, after cutting processing is accomplished, solenoid valve 4 outage, stops the air feed in the frock sucking disc, fingertip sealing piece breaks away from with the frock sucking disc rapidly.
As a preferred embodiment, the air source adsorption device further comprises a muffler 6 and a vacuum filter 7, wherein the muffler 6 is connected with the vacuum generator 5, and noise is eliminated through the muffler 6. The vacuum filter 7 is arranged between the vacuum generator 5 and the tool sucker 9, one end of the vacuum filter 7 is connected with one end of the vacuum generator 5, the other end of the vacuum filter 7 is connected with the air source input port 901, and pollutants in the air are filtered through the vacuum filter 7. Preferably, the air source adsorption device further comprises a vacuum gauge 8, wherein the vacuum gauge 8 is arranged on the tool sucker 9 and used for measuring the vacuum pressure, and the vacuum pressure value is determined through the vacuum gauge 8.
As a more preferred embodiment, a mounting hole 906 for connection with an equipment table is provided on the tool chuck 9, and one end face of the tool chuck 9 is further coated with a thermal barrier coating 907.
That is, as shown in fig. 3 to 6, according to the structural characteristics and the optimization process of the fingertip sealing plate, the tooling sucker 9 with the vacuum adsorption outer circular groove 902 and the vacuum adsorption inner circular groove 903 is designed, because the fingertip sealing plate is an annular part, the whole wafer is processed, the deformation factors of the laser processing part are considered, the vacuum adsorption outer circular groove 902 and the vacuum adsorption inner circular groove 903 are designed on the tooling sucker, the part is prevented from buckling deformation in the process of processing the fingertip sealing plate into the annular plate from the whole wafer, the tight adsorption state is maintained, and the processing precision is ensured. The vacuum gas path channel of the tool sucker 9 is connected with an external vacuum generator through a gas source input port 901, air in the cavity of the tool sucker is pumped out under the action of the vacuum generator, and a fingertip sealing piece is adsorbed on the tool sucker under the action of internal and external atmospheric pressure difference, so that the vacuum adsorption outer circular ring groove 902 and the vacuum adsorption inner circular ring groove 903 are respectively sealed by adopting two outer circular ring sealing strips 904 and an inner circular ring sealing strip 905 for ensuring a tight adsorption state. The air source input port 901 is communicated with the vacuum adsorption outer circular groove 902 and the vacuum adsorption inner circular groove 903 to form an adsorption passage, and the tool sucker is connected and positioned with the equipment workbench through the mounting hole 906. According to the laser processing technology characteristics, the fingertip sealing piece is considered to be adsorbed tightly with the tool sucker when being adsorbed on the tool sucker, so that the tool sucker is prevented from being deformed or damaged due to heat accumulation in the processing process, and the surface of the tool sucker is coated with a layer of thermal barrier coating 907, so that the tool sucker is ensured not to be damaged due to heat accumulation in the processing process.
Adopting an ultrafast laser galvanometer scanning mode to process the fingertip sealing sheet raw material to be processed according to a preset scanning processing track by combining a vacuum environment auxiliary process, wherein the preset scanning processing track comprises the following steps: firstly, processing a fingertip wire slot of the fingertip sealing piece in a mode of controlling processing according to 9 sections of wire distribution deformation, then processing an outer circle of the fingertip sealing piece, and finally processing an inner circle of the fingertip sealing piece. The processing parameters of the ultra-fast laser galvanometer scanning mode include: the pulse width of the ultrafast laser is 50 fs-300 fs; the pulse frequency of the ultrafast laser is 50 kHz-200 kHz; the ultrafast laser power is 5W-20W; the defocusing amount is-1 mm; the incident angle is 45-90 degrees; vacuum environment auxiliary process, vacuum degree 100Pa. The ultra-fast laser galvanometer scanning method and the scanning processing track are adopted, and the vacuum environment auxiliary process is combined, so that the ultra-fast laser galvanometer scanning processing of the fingertip sealing piece of the aeroengine is formed, and the precise fine high-precision and high-quality laser processing of no warpage and no deformation of the fingertip sealing piece, no remelting layer, no burr, no crack and low roughness of the fingertip wire slot (involute slot and logarithmic spiral slot) is realized.
As shown in fig. 1 and 2, according to the structural characteristics of the fingertip sealing piece, in order to prevent the thin-wall fingertip sealing piece from cutting deformation, a 9-section linear distribution deformation control processing mode is adopted for processing.
Specifically, the 9-section line distribution deformation control processing mode is as follows: a total of 36 fingertip wire grooves are formed in the fingertip sealing sheet, the fingertip sealing sheet is equally divided into 4 areas which are respectively I, II, III and IV, each area comprises 9 fingertip wire grooves, the fingertip wire grooves are processed according to the rotation symmetry sequence of the 9 fingertip wire grooves in the 4 areas, 36 fingertip wire grooves are processed by 9 groups of processing programs in total, and the sequence of the 9 groups of processing programs is specifically as follows:
group 1: i-a, III-a, II-a, IV-a;
group 2: i-b, III-b, II-b, IV-b;
group 3: i-c, III-c, II-c, IV-c;
group 4: i-d, III-d, II-d, IV-d;
group 5: i-e, III-e, II-e, IV-e;
group 6: i-f, III-f, II-f, IV-f;
group 7: i-g, III-g, II-g, IV-g;
group 8: i-h, III-h, II-h, IV-h;
group 9: a-i, III-i, II-i, IV-i.
Note that: the ultrafast laser galvanometer scans and processes according to the drawn fingertip line slot pattern, and the processing track is automatically identified.
Examples
Taking a certain fingertip sealing sheet (fig. 7 and 8) as an example: the processing of the fingertip sealing sheet is extremely high in requirement, 36 involute narrow grooves (fingertip trunking) with the diameter of 0.3mm are processed on a sheet with the diameter of 0.25mm, the size and position precision of the fingertip trunking are 0.03mm, no heavy melting layer exists after processing, the roughness Ra is less than 0.8 mu m, the high-temperature alloy material is required to be flat, the fingertip sealing sheet is not allowed to warp and deform, the surface of the fingertip sealing sheet is not allowed to have any sliding injury, indentation and crack, and the surface of a kerf is not allowed to have burrs.
The method comprises the following steps:
(1) Installing and positioning a fingertip sealing sheet raw material to be processed: installing and positioning fingertip sealing sheet raw materials on ultrafast laser processing equipment through an aero-engine fingertip sealing sheet high-precision nondestructive multi-point air source adsorption device (figure 1);
specifically, determining pressure parameters of a tool sucker: 1) Air source pressure: 0.8MPa; 2) Vacuum pressure: -0.06MPa.
And installing the tool sucker on an equipment workbench, adjusting the air source pressure value and the vacuum pressure value to be in a working range, installing the fingertip sealing sheet raw material after the vacuum pressure of the tool sucker is stable, and aligning the fingertip sealing sheet raw material.
(2) Determining the scanning processing parameters of the ultrafast laser galvanometer: reasonable laser processing parameters are determined according to material processing characteristics (material metal, nonmetal type, material thickness and material surface quality).
The processing parameters of the ultra-fast laser galvanometer scanning mode include: 1) Determining the ultrafast laser pulse width: 200fs; 2) Determining the ultrafast laser pulse frequency: 80kHz; 3) Determining laser power: 5W; 4) Defocus amount: +1mm; 5) Incidence angle θ:90 °; 6) Setting a scanning track: drawing a fingertip slot pattern of a fingertip sealing piece, and automatically identifying a scanning track; 7) And the vacuum environment is assisted, and the vacuum degree is 100MPa.
(3) Ultra-fast laser galvanometer scanning processing fingertip trunking: and positioning and processing the fingertip trunking by using ultra-fast laser processing equipment (an ultra-fast laser galvanometer scanning mode).
According to the structural characteristics of the fingertip sealing piece, a 9-section line distribution deformation control processing distribution mode is adopted for processing in order to prevent the thin-wall part from cutting deformation.
The 9-section line distribution deformation control processing mode is as follows: a total of 36 fingertip wire grooves are formed in the fingertip sealing sheet, the fingertip sealing sheet is equally divided into 4 areas which are respectively I, II, III and IV, each area comprises 9 fingertip wire grooves, the fingertip wire grooves are processed according to the rotation symmetry sequence of the 9 fingertip wire grooves in the 4 areas, 36 fingertip wire grooves are processed by 9 groups of processing programs in total, and the sequence of the 9 groups of processing programs is specifically as follows:
group 1: i-a, III-a, II-a, IV-a;
group 2: i-b, III-b, II-b, IV-b;
group 3: i-c, III-c, II-c, IV-c;
group 4: i-d, III-d, II-d, IV-d;
group 5: i-e, III-e, II-e, IV-e;
group 6: i-f, III-f, II-f, IV-f;
group 7: i-g, III-g, II-g, IV-g;
group 8: i-h, III-h, II-h, IV-h;
group 9: a-i, III-i, II-i, IV-i.
(4) Ultra-fast laser galvanometer scanning processing fingertip sealing piece excircle and inner circle: and positioning and processing the outer circle and the inner circle of the fingertip sealing sheet by using ultra-fast laser processing equipment (ultra-fast laser galvanometer scanning mode).
According to the structural characteristics of the fingertip sealing piece, in order to prevent the thin-wall part from cutting deformation, after 36 fingertip trunking are processed, the outer circle and the inner circle of the fingertip sealing piece are sequentially processed.
Note that: the method comprises the steps of sequentially processing an outer circle and an inner circle of a fingertip sealing piece, dividing the fingertip sealing piece into a circle with the inner circle diameter of 77mm and a circle with the outer circle diameter of 100mm, enabling the fingertip sealing piece to be tightly adsorbed by a tool sucking disc, preventing the fingertip sealing piece from deforming, powering off an electromagnetic valve after all cutting of the fingertip sealing piece and the outer circle is completed, isolating compressed air (an air source), stopping air supply in the tool sucking disc under the condition that no compressed air (an air source) is input, separating parts from the tool sucking disc, and taking down the fingertip sealing piece (the circle) and an excessive material piece (the disc).
(4) Cleaning the surface of the fingertip sealing piece: and (5) utilizing a compressed air gun to blow and dry pollutants on the surface of the fingertip sealing sheet.
(5) Fingertip seal inspection: and checking the processing quality of the fingertip trunking.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The processing method of the aeroengine fingertip sealing sheet is characterized by comprising the following steps of:
installing and positioning the fingertip sealing sheet raw material to be processed by adopting an air source vacuum adsorption positioning mode;
cutting and processing are carried out on the fingertip sealing sheet raw material to be processed according to a preset scanning and processing track by adopting an ultrafast laser galvanometer scanning mode and combining a vacuum environment auxiliary process, wherein the preset scanning and processing track comprises the following components: firstly, cutting and processing a fingertip wire slot of a fingertip sealing piece in a mode of controlling processing according to 9 sections of wire distribution deformation, then cutting and processing an outer circle of the fingertip sealing piece, and finally cutting and processing an inner circle of the fingertip sealing piece;
the method for installing and positioning the fingertip sealing sheet raw material to be processed by adopting the air source vacuum adsorption positioning mode specifically comprises the following steps:
installing and positioning a fingertip sealing sheet raw material to be processed through an air source adsorption device;
the air source adsorption device comprises an air source (1), a handle switch (2), a regulating valve (3), an electromagnetic valve (4), a vacuum generator (5), a silencer (6), a vacuum filter (7), a vacuum meter (8) and a tool sucker (9), wherein an air source input port (901) is formed in the side face of the tool sucker (9), a vacuum adsorption outer circular groove (902) corresponding to the outer circle of a fingertip sealing piece and a vacuum adsorption inner circular groove (903) corresponding to the inner circle of the fingertip sealing piece are formed in one end face of the tool sucker (9), the vacuum adsorption outer circular groove (902) and the vacuum adsorption inner circular groove (903) are communicated with the air source input port (901), the air source input port (901) is connected with one end of the vacuum generator (5), the other end of the vacuum generator (5) is connected with one end of the electromagnetic valve (4), the other end of the electromagnetic valve (4) is connected with one end of the regulating valve (3), the other end of the regulating valve (3) is connected with one end of the handle switch (2), and the other end of the handle switch (2) is connected with the air source (1). The silencer (6) is connected with the vacuum generator (5); the vacuum filter (7) is arranged between the vacuum generator (5) and the tool sucker (9), one end of the vacuum filter (7) is connected with one end of the vacuum generator (5), and the other end of the vacuum filter (7) is connected with the air source input port (901); the vacuum gauge (8) is arranged on the tool sucker (9) and used for measuring the vacuum pressure;
an outer circular sealing strip (904) is arranged on one end face of the tool sucker (9) and positioned on two sides of the vacuum adsorption outer circular groove (902), and an inner circular sealing strip (905) is arranged on one end face of the tool sucker (9) and positioned on two sides of the vacuum adsorption inner circular groove (903);
the fixture sucker (9) is provided with a mounting hole (906) for being connected with an equipment workbench, and one end face of the fixture sucker (9) is further coated with a thermal barrier coating (907).
2. The method for processing the aeroengine fingertip sealing sheet according to claim 1, wherein in the air source vacuum adsorption positioning mode, the air source pressure is 0.6-1.5 MPa; the vacuum pressure is-0.1 MPa to 0MPa.
3. The method for processing the fingertip sealing sheet of the aeroengine according to claim 1, wherein the processing parameters of the ultra-fast laser galvanometer scanning mode comprise: the pulse width of the ultrafast laser is 50 fs-300 fs; the pulse frequency of the ultrafast laser is 50 kHz-200 kHz; the ultrafast laser power is 5-W W to 20W.
4. The method for processing the fingertip sealing sheet of the aeroengine according to claim 3, wherein the processing parameters of the ultra-fast laser galvanometer scanning mode further comprise: the defocusing amount is-1 mm; the incident angle is 45-90 degrees.
5. A method of processing an aeroengine fingertip seal according to claim 3, wherein the vacuum degree of the vacuum environment auxiliary process is 100Pa.
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