CN107457615A - The grinding processing method of turbo blade step surface - Google Patents
The grinding processing method of turbo blade step surface Download PDFInfo
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- CN107457615A CN107457615A CN201710785193.XA CN201710785193A CN107457615A CN 107457615 A CN107457615 A CN 107457615A CN 201710785193 A CN201710785193 A CN 201710785193A CN 107457615 A CN107457615 A CN 107457615A
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- Prior art keywords
- turbo blade
- processed
- grinding
- step surface
- inclination
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/14—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding turbine blades, propeller blades or the like
Abstract
The invention discloses a kind of grinding processing method of turbo blade step surface, comprise the following steps：A, selection is using inclination filing；B, turbo blade angle of inclination selection to be processed；C, grinding wheel dressing method is determined；D, according to designed inclination angle degree clamping turbo blade to be processed；E, the step surface and integral shroud plane for treating turbine blades carry out grinding；F, turbo blade detects, and unqualified submission defective work processing, certified products carry out subsequent processing.Grinding wheel structure is changed to the sawtooth pattern of inclined turbo blade towards corresponding zigzag wheel face, realization is processed and formed at one time to sawtooth pattern face, and utilize the outer rim processing inclined-plane of emery wheel, so as to realize that clamped one time can complete overall dimension processing, avoid the mismachining tolerance that multiple clamping is brought, the labor intensity of operator is alleviated, improves processing efficiency.
Description
Technical field
The present invention relates to aero engine turbine blades processing technique field, especially, is related to a kind of turbo blade step
The grinding processing method in face.
Background technology
Aero-turbine one-level working-blade, working environment is severe, the calorific intensity that should have, fatigue resistance and
Croop property.Turbo blade is typically made up of tenon tooth, listrium, several parts of blade, and tenon tooth end face connects with listrium, and connecting part leads to
Often there is the switching R to differ in size.(shown in below figure 6,7)., it is necessary to by Reference Transforming to listrium before tenon tooth is processed, it is vented
The upper and lower listrium in side and tenon tooth end face, totally 3 planes.Tetra- faces of A.B.C.D form a step surface simultaneously.
According to technological requirement, it is necessary to process A.B.C.D.E totally 5 positions, the positioning method of original processing method is：Due to by
Air inlet margin plate end face is black skin, is not used to positioning processing, M, N, L point and K faces can only be chosen on the blade of essence casting
Locating element, then using three work step processing of flat stone mill point, the 1st step：A faces are processed, at the processing of emery wheel edge B, C, the 2nd
Step：Process D faces, the 3rd step：Process E faces.
The problem of original processing process is present：
1) processing efficiency is extremely low, and generally a collection of 55 blades need 1 day half about 12 hour process time, if there is part overproof
Processing, then increase cycle half a day again, processing efficiency is low to have a strong impact on that the production of certain type turbo blade is delivered.
2) crudy is unstable, and a collection of part often has that 2~3 parts are overproof, and out-of-tolerance parts are needed by unqualified
Product processing, have impact on the flowing of part.
The reason for efficiency is low, quality is unstable is caused to have at 3 points by thinking：
1) process falls behind
It is from process chart it can be seen that qualified from blank to finally processing, if processed using common plane grinding machine：
One part needs repeatedly clamping processing, measurement, and it is qualified that a plane at least needs clamping to process for 3 times, and a part is extremely
It is few to need clamping 9 times repeatedly.The labor intensity of operator is big, and efficiency is low.Multiple clamping brings the hidden danger of position error, if having
Clamped one time is unstable, then causes dimension overproof.Though once filled as shown in figure 8, can be realized after being converted into numerical control plane grinding
Folder processes all planes, but can not solve the problems, such as processing dimension fluctuation.
2) frock clamp positioning method is unstable
It can be seen that, what blade located lateral was leaned on is two points of blade leading edge, upper and lower listrium from the clamping of part
Machined surface bottom is hanging, causes part to be respectively formed cantilever beam structure in grinding, when surplus is bigger than normal, then machined surface meeting
There is " sinking " phenomenon.There is Auxiliary support under tenon machined surface, but practical operation is got up considerably complicated, complete armrest sense, support
Power greatly then jacks up tenon very much, too small then tenon " sinking ".Clamp structure causes to position unstable.As shown in Figure 9 and Figure 10.
3) flat stone mill can not ensure listrium lateral dimension
Because effective machined surface of emery wheel is the cylindrical of emery wheel, emery wheel side side in grinding process can constantly be lost,
But can not repair, therefore listrium lateral dimension can gradually increase.Listrium and tenon tooth end face switching R are processed on flat stone mill simultaneously
It can only be formed by hand finish emery wheel, this dressing method uniformity extreme difference, while danger coefficient is high, easily causes industrial injury thing
Therefore.As shown in figure 11.
The content of the invention
The invention provides a kind of grinding processing method of turbo blade step surface, to solve existing turbo blade step surface
It can support to form cantilever design in process, turbo blade part cantilever part can be caused under the influence of pressing force is processed
Sink, so as to reduce machining accuracy and improve the technical problem of processing risk.
The present invention provides a kind of grinding processing method of turbo blade step surface, comprises the following steps：A, selection is used and inclined
Oblique filing；B, turbo blade angle of inclination selection to be processed；C, grinding wheel dressing method is determined；D, filled according to designed inclination angle degree
Press from both sides turbo blade to be processed；E, the step surface and integral shroud plane for treating turbine blades carry out grinding；F, turbine leaf
Piece detects, and unqualified submission defective work processing, certified products carry out subsequent processing.
Further, angle of inclination selects in step b, is specially：It will carry and assemble the fixture of turbo blade to be processed
Heeling condition is adjusted to, and makes to leave spacing between the top of the turbo blade to be processed after inclination and grinding wheel guard, with
Avoid turbo blade top to be processed contact from shortening the service life of emery wheel to grinding wheel spindle protective cover, while avoid lathe Y
Axle triggers alarm close to extreme position.
Further, the angle of inclination of turbo blade to be processed is controlled at 15 °~40 °.
Further, the angle of inclination of turbo blade to be processed is 30 °.
Further, angle of inclination adjusts, and is specially：According to the size and processing request of turbo blade to be processed, adjust
Whole fixture angle of inclination, and clamping turbo blade to be processed.
Further, grinding wheel dressing method is determined in step c, is specially：By adjusting and determining turbo blade to be processed
Angle of inclination so that the step surface and integral shroud plane of turbo blade to be processed are transformed into sawtooth pattern face and inclined-plane.
Further, emery wheel is repaired using emery wheel, directly repairs out zigzag and switching arc.
Further, the sawtooth to match with the sawtooth pattern face of inclined turbo blade to be processed is designed to using emery wheel
Shape.
Further, grinding uses the processing mode of roughing feed jog, to advantageously ensure that machining shape；Selection uses
Gross blow hole Brown Alundum emery wheel carries out grinding, to ensure that turbo blade to be processed does not produce burn phenomenon in grinding.
Further, step e is specially：Using shaping grinding machine tool directly process turbo blade to be processed step surface and
Integral shroud plane, so as to realize that clamped one time stably processes all faces.
The invention has the advantages that：
The grinding processing method of turbo blade step surface of the present invention, using filing is tilted, lower pressure is decomposed, subtracted
It is few support is positioned under turbo blade pressing force, without increase supporting construction be just able to maintain that structural stability and
Improve machining accuracy.While with the change for being ground direction, turbo blade is also provided with clamping into heeling condition, will be original
Step surface and the processing that vertical plane process change is sawtooth pattern face and inclined-plane, so as to be adapted to inclination filing.By emery wheel
Structure is changed to realize once adding to sawtooth pattern face towards corresponding zigzag wheel face with the sawtooth pattern of inclined turbo blade
Work is molded, and using the outer rim processing inclined-plane of emery wheel, so as to realize that clamped one time can complete overall dimension processing, is avoided repeatedly
The mismachining tolerance that clamping is brought, the labor intensity of operator is alleviated, improves processing efficiency.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the step flow chart of the grinding processing method of the turbo blade step surface of the preferred embodiment of the present invention；
Fig. 2 is the scattered schematic diagram of the grinding force of the turbo blade step surface of the preferred embodiment of the present invention；
Fig. 3 is the schematic diagram of the lathe grinding interference of the preferred embodiment of the present invention；
Fig. 4 is the schematic diagram of the emery wheel finishing sand of the preferred embodiment of the present invention；
Fig. 5 is the turbo blade flow process chart after the process optimization of the preferred embodiment of the present invention；
Fig. 6 is the lateral working position schematic diagram of turbo blade；
Fig. 7 is the working position schematic diagram that turbo blade tenon tooth end is overlooked；
Fig. 8 is existing turbo blade flow process chart；
Fig. 9 is existing Clamp of turbine blade positioning schematic diagram；
Figure 10 is existing turbo blade processing stress diagram；
Figure 11 is existing emery wheel loss schematic diagram.
Embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be limited by following and
The multitude of different ways of covering is implemented.
Fig. 1 is the step flow chart of the grinding processing method of the turbo blade step surface of the preferred embodiment of the present invention；Fig. 2 is
The scattered schematic diagram of the grinding force of the turbo blade step surface of the preferred embodiment of the present invention；Fig. 3 is the preferred embodiment of the present invention
The schematic diagram of lathe grinding interference；Fig. 4 is the schematic diagram of the emery wheel finishing sand of the preferred embodiment of the present invention；Fig. 5 is this hair
Turbo blade flow process chart after the process optimization of bright preferred embodiment.
As depicted in figs. 1 and 2, the grinding processing method of the turbo blade step surface of the present embodiment, comprises the following steps：a、
Selection is using inclination filing；B, turbo blade angle of inclination selection to be processed；C, grinding wheel dressing method is determined；D, according to design
Angle of inclination clamping turbo blade to be processed；E, treat the step surface of turbine blades and integral shroud plane carries out grinding and added
Work；F, turbo blade detects, and unqualified submission defective work processing, certified products carry out subsequent processing.Turbo blade platform of the present invention
The grinding processing method of terrace, using filing is tilted, lower pressure is decomposed, reduces the turbo blade under being positioned to support
Pressing force, without increase supporting construction be just able to maintain that structural stability and improve machining accuracy.With grinding side
To change while, turbo blade is also provided with clamping into heeling condition, original step surface and vertical plane are processed
The processing on sawtooth pattern face and inclined-plane is converted into, so as to be adapted to inclination filing.Grinding wheel structure is changed to and inclined turbine leaf
The sawtooth pattern of piece is realized and sawtooth pattern face is processed and formed at one time, and utilize the outer of emery wheel towards corresponding zigzag wheel face
Edge processes inclined-plane, so as to realize that clamped one time can complete overall dimension processing, the mismachining tolerance for avoiding multiple clamping from bringing, subtracts
The light labor intensity of operator, improves processing efficiency.
As shown in Figures 2 and 3, in the present embodiment, angle of inclination selects in step b, is specially：It will carry and assemble and be to be added
The fixture of work turbo blade is adjusted to heeling condition, and makes top and the grinding wheel guard of the turbo blade to be processed after inclination
Between leave spacing, with avoid turbo blade top to be processed contact to grinding wheel spindle protective cover and shorten emery wheel use the longevity
Life, while avoid lathe Y-axis from triggering alarm close to extreme position.Turbo blade to be processed after inclination so that whirlpool to be processed
The step surface and integral shroud plane of impeller blade are transformed into sawtooth pattern face and inclined-plane, solve emery wheel side participate in grinding and can not
The problem of finishing.
As shown in Figures 2 and 3, in the present embodiment, the angle of inclination of turbo blade to be processed is controlled at 15 °~40 °.
As shown in Figures 2 and 3, in the present embodiment, the angle of inclination of turbo blade to be processed is 30 °.
As shown in Figure 1, Figure 2 and Figure 3, in the present embodiment, angle of inclination adjustment, it is specially：According to turbo blade to be processed
Size and processing request, adjustment fixture angle of inclination, and clamping turbo blade to be processed.
As shown in Figure 2, Figure 3 and Figure 4, in the present embodiment, grinding wheel dressing method is determined in step c, is specially：Pass through adjustment
With the angle of inclination for determining turbo blade to be processed so that the step surface and integral shroud plane of turbo blade to be processed are transformed into saw
Profile of AT and inclined-plane.
As shown in figure 4, in the present embodiment, emery wheel is repaired using emery wheel, directly repairs out zigzag and switching arc
Shape.
As shown in Figure 2, Figure 3 and Figure 4, in the present embodiment, it is designed to and inclined turbo blade to be processed using emery wheel
The zigzag that sawtooth pattern face matches.
As shown in Fig. 1, Fig. 3, Fig. 4 and Fig. 5, in the present embodiment, grinding uses the processing mode of roughing feed jog, to have
Beneficial to guarantee machining shape.Selection carries out grinding using gross blow hole Brown Alundum emery wheel, to ensure that turbo blade to be processed exists
Burn phenomenon is not produced during grinding.
As shown in Figures 2 and 3, in the present embodiment, step e is specially：Whirlpool to be processed is directly processed using shaping grinding machine tool
The step surface and integral shroud plane of impeller blade, so as to realize that clamped one time stably processes all faces.
During implementation, there is provided a kind of grinding processing method of turbo blade step surface, improve grinding step surface processing technology,
Parts fixation mode and crushing mode.Comprise the following steps：
The first step：Filing is tilted using step surface
Due to clamp structure limit, cantilever beam structure turbine blades part is unstable, to meet design requirement and
Transformed error is reduced, clamp structure can not just be changed, it is necessary to find solution on existing fixture.As shown in Figures 2 and 3,
By the way that fixture is adjusted into an angle, the power vertically downward being subject to when the tenon tooth end face of turbo blade part is processed then is decomposed
For vertical force and horizontal lateral force (as shown in Figure 2), the vertical force that tenon tooth end face is subject to reduces, and can mitigate cantilever beam structure
Influence.Therefore tenon tooth end face without using Auxiliary support again.
Second step：Part turns angle Selection
1st, by calculating, it is best that fixture angle of inclination is adjusted to 45 ° of effects, but tenon tooth end face is too high, in processing integral shroud
When, tenon tooth position can push up grinding wheel spindle protective cover, the service life of serious curtailment emery wheel.Fixture is too high simultaneously causes lathe Y
Axle is close to extreme position, easily triggering alarm, therefore 45 ° and improper.
2nd, manufactured for convenience of base, the angle that fixture is adjusted should be integer.
3rd, through live repetition test, finally determine fixture angle of inclination being adjusted to 30 °, fixture positioning cantilever beam can be mitigated
Sinkage caused by effect, while do not shorten emery wheel service life, as shown in Figure 3.
3rd step：Determine grinding wheel dressing method
Originally 3 planes of processing, after being adjusted to 30 ° by fixture angle of inclination, step surface and plane that ABCDE is formed
Become a sawtooth pattern face and an inclined-plane.Therefore common flat-faced wheel can not then be processed, to disposable processing sawtooth
Face is needed by shaping roller, by crushing into the zigzag consistent with face to be processed.As shown in Figure 3 and Figure 4.
Because form grinding typically uses roughing feed, the processing mode of jog, shape, but this grinding are advantageously ensured that
Mode is because the face for participating in grinding is more, therefore caused grinding heat is also bigger than common plain grinding, to ensure part machined surface not
Burn phenomenon is produced, from the emery wheel of ultra-soft gross blow hole Brown Alundum.
Grinding wheel structure and processing before improvement, as shown in Figure 10 and Figure 11.Grinding wheel structure and processing after improvement, as Fig. 2,
Shown in Fig. 3 and Fig. 4.
The beneficial effect of the grinding processing method of turbo blade step surface of the present invention：
(1) processing situation is tried：Filing is tilted using step and processes a collection of testpieces, totally 55, needs 6.8 hours altogether,
Original processing method, which processes 55 parts, about needs 12 hours, and efficiency improves 40%.Because clamped one time can be completed to process, avoid
The position error that clamping is brought repeatedly, while stress when processing reduces tenon tooth cross grinding is tilted, without Auxiliary support
Also can complete to process.Processing accessory size stability is far above former process.
(2) verification the verifying results：21 batches of blades of improvement project post-processing are continuously tracked, totally 1155 blades, none part blade
Dimension overproof.Former every batch of blade of process has 2~3 dimension overproofs.Qualification rate is obviously improved.Listrium turns with tenon tooth end face
Meet R and repair emery wheel every time by shaping roller and automatically form, the R that transfers shape and R sizes have preferable uniformity.Process program
Operator is when processing part after improvement, it is only necessary to and clamped one time can complete overall dimension processing, while without manual trim sand
Wheel, greatly alleviate the labor intensity of operator.In process none part is overproof, is truly realized quality, efficiency
Doulbe-sides' victory.Technique before improvement is as shown in figure 8, the technique after improving is as shown in Figure 5.
(3) production application：All step surface processing are can be applied to, and are incorporated in plane and the processing for the R that transfers, can be effective
Raising processing efficiency and crudy.
By the way that fixture is tilted into 30 ° of direct clamping turbo blade parts, grinding force suffered by scattered tenon tooth end face (A faces), take
Disappear Auxiliary support；Emery wheel is repaired with emery wheel, directly repairs out step shape and switching R；Directly processed with shaping grinding machine tool
Step surface (ABCD faces)；With emery wheel inclined-plane position processing E faces；Realize that clamped one time stably processes all faces.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. grinding processing method of turbo blade step surface, it is characterised in thatComprise the following steps：A, selection is using inclination filing；B, turbo blade angle of inclination selection to be processed；C, grinding wheel dressing method is determined；D, according to designed inclination angle degree clamping turbo blade to be processed；E, the step surface and integral shroud plane for treating turbine blades carry out grinding；F, turbo blade detects, and unqualified submission defective work processing, certified products carry out subsequent processing.
- 2. the grinding processing method of turbo blade step surface according to claim 1, it is characterised in thatAngle of inclination selects in the step b, is specially：The fixture for carrying and assembling turbo blade to be processed is adjusted to heeling condition, and makes the turbine leaf to be processed after inclination Spacing is left between the top of piece and grinding wheel guard, to avoid turbo blade top to be processed contact to grinding wheel spindle protective cover And shorten the service life of emery wheel, while avoid lathe Y-axis from triggering alarm close to extreme position.
- 3. the grinding processing method of turbo blade step surface according to claim 2, it is characterised in thatThe angle of inclination of turbo blade to be processed is controlled at 15 °~40 °.
- 4. the grinding processing method of turbo blade step surface according to claim 3, it is characterised in thatThe angle of inclination of turbo blade to be processed is 30 °.
- 5. the grinding processing method of turbo blade step surface according to claim 3, it is characterised in thatAngle of inclination adjusts, and is specially：According to the size and processing request of turbo blade to be processed, adjustment fixture angle of inclination, and clamping turbine leaf to be processed Piece.
- 6. the grinding processing method of turbo blade step surface according to claim 1, it is characterised in thatGrinding wheel dressing method is determined in step c, is specially：By the angle of inclination for adjusting and determining turbo blade to be processed so that the step surface and integral shroud of turbo blade to be processed are put down Face is transformed into sawtooth pattern face and inclined-plane.
- 7. the grinding processing method of turbo blade step surface according to claim 6, it is characterised in thatEmery wheel is repaired using emery wheel, directly repairs out zigzag and switching arc.
- 8. the grinding processing method of turbo blade step surface according to claim 6, it is characterised in thatThe zigzag for being designed to match with the sawtooth pattern face of inclined turbo blade to be processed using emery wheel.
- 9. the grinding processing method of turbo blade step surface according to claim 7, it is characterised in thatGrinding uses the processing mode of roughing feed jog, to advantageously ensure that machining shape；Selection carries out grinding using gross blow hole Brown Alundum emery wheel, to ensure that turbo blade to be processed does not produce burning in grinding Hinder phenomenon.
- 10. the grinding processing method of turbo blade step surface according to any one of claim 1 to 9, it is characterised in thatStep e is specially：The step surface and integral shroud plane of turbo blade to be processed are directly processed using shaping grinding machine tool, so as to realize clamped one time It is stable to process all faces.
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| CN109015119A (en) * | 2018-08-16 | 2018-12-18 | 蓝思科技（长沙）有限公司 | A kind of processing method for turning round class glassware |
| CN110497318A (en) * | 2019-08-16 | 2019-11-26 | 成都和鸿科技有限公司 | A kind of heavy duty gas turbine processing idler wheel and its design method |
| CN110497250A (en) * | 2019-06-14 | 2019-11-26 | 成都和鸿科技有限公司 | A kind of processing method of small-sized combustion engine turbine guide vane circular arc and end face |
| CN111113208A (en) * | 2019-12-25 | 2020-05-08 | 贵阳航发精密铸造有限公司 | Method for machining radial arc groove of guide blade of complex hollow turbine |
| CN112372379A (en) * | 2020-11-12 | 2021-02-19 | 中国航发南方工业有限公司 | Grinding method for complex curved surface type blade tip for aero-engine |
| CN113021186A (en) * | 2021-02-23 | 2021-06-25 | 贵阳航发精密铸造有限公司 | Grinding fixture for tenon of aviation turbine blade |
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| CN109015119A (en) * | 2018-08-16 | 2018-12-18 | 蓝思科技（长沙）有限公司 | A kind of processing method for turning round class glassware |
| CN110497250A (en) * | 2019-06-14 | 2019-11-26 | 成都和鸿科技有限公司 | A kind of processing method of small-sized combustion engine turbine guide vane circular arc and end face |
| CN110497318A (en) * | 2019-08-16 | 2019-11-26 | 成都和鸿科技有限公司 | A kind of heavy duty gas turbine processing idler wheel and its design method |
| CN111113208A (en) * | 2019-12-25 | 2020-05-08 | 贵阳航发精密铸造有限公司 | Method for machining radial arc groove of guide blade of complex hollow turbine |
| CN112372379A (en) * | 2020-11-12 | 2021-02-19 | 中国航发南方工业有限公司 | Grinding method for complex curved surface type blade tip for aero-engine |
| CN112372379B (en) * | 2020-11-12 | 2022-04-01 | 中国航发南方工业有限公司 | Grinding method for complex curved surface type blade tip for aero-engine |
| CN114799383A (en) * | 2021-01-19 | 2022-07-29 | 中国航发商用航空发动机有限责任公司 | Method and device for trimming casting edge plate of single crystal turbine blade and single crystal turbine blade |
| CN114799383B (en) * | 2021-01-19 | 2024-01-02 | 中国航发商用航空发动机有限责任公司 | Method and device for trimming casting flange plate of single crystal turbine blade and single crystal turbine blade |
| CN113021186A (en) * | 2021-02-23 | 2021-06-25 | 贵阳航发精密铸造有限公司 | Grinding fixture for tenon of aviation turbine blade |
| CN113478167A (en) * | 2021-07-21 | 2021-10-08 | 中国航发航空科技股份有限公司 | Method for repairing blade shroud of working blade of high-pressure turbine of aircraft engine |
| CN113967857A (en) * | 2021-10-26 | 2022-01-25 | 中国航发沈阳黎明航空发动机有限责任公司 | Machining method for deformation repair of turbine front sealing disc |
| CN113967857B (en) * | 2021-10-26 | 2023-09-22 | 中国航发沈阳黎明航空发动机有限责任公司 | Machining method for deformation repair of turbine front sealing disc |
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