CN104475842A - Milling method for structural molded surface of integrated blade disc - Google Patents
Milling method for structural molded surface of integrated blade disc Download PDFInfo
- Publication number
- CN104475842A CN104475842A CN201410681318.0A CN201410681318A CN104475842A CN 104475842 A CN104475842 A CN 104475842A CN 201410681318 A CN201410681318 A CN 201410681318A CN 104475842 A CN104475842 A CN 104475842A
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- China
- Prior art keywords
- blade
- milling
- profile
- molded surface
- blisk
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/16—Working surfaces curved in two directions
- B23C3/18—Working surfaces curved in two directions for shaping screw-propellers, turbine blades, or impellers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
- B23C5/1009—Ball nose end mills
- B23C5/1018—Ball nose end mills with permanently fixed cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
- B23C5/1081—Shank-type cutters, i.e. with an integral shaft with permanently fixed cutting inserts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a milling method for a structural molded surface of an integrated blade disc. The milling method comprises the following steps: fixing a green body of the integrated blade disc to a workbench of a five-axis numerical control machine tool according to a mode that the blade tip of the blade body faces upwards, layering the green body of the integrated blade disc from top to bottom at a layer height of 0.05-0.15mm along the direction of a blade disc blade stacking shaft; performing coarse milling on a molded surface runner of the blade disc structure within the layer height range and then performing fine milling on the molded surface of the blade disc structure within the layer height range by adopting a four-blade milling cutter which is of a-ball nose-shaped structure, wherein two blades are used for performing the coarse milling and four blades are used for performing fine milling. After the molded surface of the blade disc in the layer is processed, the molded surface of the blade disc in the next layer is processed until the structural molded surface of the whole blade disc is processed in a mode that the whole disc is layered from the blade tip of the blade to the blade root. The milling method disclosed by the invention is used for milling the structural molded surface of the integrated blade disc, so that the processing quality and the processing production efficiency of the structural molded surface of the integrated blade disc are greatly improved, and the production cost is lowered.
Description
Technical field
The present invention relates to aero-engine leaf dish and manufacture process technology, particularly a kind of Blisk profile milling technological method for processing.
Background technology
Along with the development of aero engine technology, having there is a kind of integrally-built leaf dish in aero-engine, replaces the leaf dish of traditional assembly structure.Blisk is complicated, requirement on machining accuracy is high, especially vane working surface is Space Free-Form Surface, shape is very complicated, especially adapt to its high pressure, high-revolving condition of work, its material extensively adopts titanium alloy, titanium matrix composite, titanium aluminide composite etc. to be difficult to the composite of machining, Blisk profile machinability extreme difference.
The manufacturing technology of current blisk mainly adopts composite manufacturing technology, namely first adopts three axle lathes to open slightly to vane channel, and using five-axis machine tool to carry out the rough milling of blade, half finish-milling and finish-milling thereafter, this technological method for processing exists following shortcoming:
1) working (machining) efficiency is low, and the cycle is long.Fluting between blade profile and runner processing are mainly carried out in roughing, the material of nearly 80% is cut, during roughing, mainly be divided into two steps, the first step is fluting processing, and the object of fluting is interlobate airways open, forms passage, for roughing is ready, the general three axle lathes that use carry out.Fluting occupies a large amount of man-hour, and in whole roughing process, the effective rate of utilization of equipment is but less than 60%; Second step is blade profile roughing, and main purpose is the surplus that removal three axle lathe can not be processed; After roughing completes, blade profile need retain the surplus of 1.5 ~ 1.8mm, so just cause the space between blade profile more narrow and small, cause the accessibility of cutter poorer simultaneously, tool diameter selects space less, have only and use little cutter to process, now can only adopt the low feeding of the slow-speed of revolution, make the roughing cycle long.Roughing time and fine finishining time are than being on average about 10:1.
2) during fine finishining, blade is variable cross-section distorted-structure, leaf length, blade are thin, cause blade tip place rigidity extreme difference, cutting force acts on the termination of leaf exhibition, very easily produces elastic deformation and simultaneous chatter, is difficult to ensure size, different cutter spacing for the processing of slim vane and springback influence also different, can directly cause gauge overproof; And process chatter blade surface can be caused to produce chatter mark, and easily make cutter tipping, have a strong impact on blade surface quality.
3) blade profile of most of blisk is only 0.2 ~ 0.3mm at inlet and outlet edge thickness, and when fine finishining is carried out, blade relies on without intensity, at front and rear edge place, easily occurred cutting, sharp limit, contracting strength, the phenomenon such as root face.Cause that accessory size is overproof even to be scrapped.
4), when carrying out half essence and fine finishining, curved surface stress deformation, by the impact of many factors, directly carries out analysis to it extremely difficult.Therefore take the method for pouring into adhesive for building between blade path, change the damping characteristic of part with this, reduce the chatter of blade; But in fact, when pouring into adhesive for building, determine because of operating personnel, the quality of different operating personnel's perfusions is inconsistent, the different blade profiles of even same operating personnel's perfusion, its quality also disunity, and containing non-ferrous metal in adhesive for building, titanium alloy is produced and pollutes.
Therefore, traditional machining process has been difficult to be competent at, must explore new processing technology.
Summary of the invention
The object of the invention is to the weak point overcoming existing process, a kind of brand-new Blisk profile milling technological method for processing is provided, to improve the crudy of Blisk profile, and enhances productivity, reduce production cost.
Basic thought of the present invention prior art is adopted three axle lathes to open slightly to vane channel, rear use five-axis machine tool is rough milled successively to blade, half finish-milling and finish-milling complete whole processing of Blisk profile, becoming employing five-axis machine tool uses one milling cutter layering is completed the thick of whole Blisk profiles in same floor height, fine finishining, vane channel is opened slightly, blade rough mills the roughing merging into bladed-disk assemblies profile, half finish-milling of blade and finish-milling merge into the fine finishining of bladed-disk assemblies profile, complete the processing of Blisk profile successively.
A kind of Blisk profile milling technological method for processing provided by the invention, its content mainly comprises, the base substrate of blisk is up fixed on five-axle number control machine tool workbench by blade tip, blisk base substrate is pressed the layering of 0.05 ~ 0.15mm floor height from the top down along blade stacking direction of principal axis, coarse milling processing is carried out with two-edged with same handle, four swords are used for four blade milling cutters of the ball nose shape and structure of smart Milling Process, first coarse milling processing is carried out to the bladed-disk assemblies profile runner in this floor height scope, again smart Milling Process is carried out to the bladed-disk assemblies airfoil surface in this floor height scope, after this layer of leaf dish-type face all processes, the lower one deck bladed-disk assemblies profile of reprocessing, until whole leaf dish processes the structure profile of whole leaf dish from blade tip to blade root layering.
In Blisk profile milling technological method for processing of the present invention, retain accurately machined surplus after the blade leading edge of this floor height, exhaust limit and middle part roughing preferably equal.
In Blisk profile milling technological method for processing of the present invention, the cutter rotating speed of Milling Process preferably controls the scope at 5000 ~ 7640r/min.
In Blisk profile milling technological method for processing of the present invention, the structure of four blade milling cutters of described ball nose shape and structure is, two symmetrical conveyor screws grind the milling blade of globulate structure, for the rough milling of bladed-disk assemblies profile, the conveyor screw of two other symmetry processes a step respectively, on step conveyor screw, grind out milling blade, the finish-milling for bladed-disk assemblies profile is processed, and the end of whole cutter head is ball nose shape.For accurately machined two stepped ramp type milling blades, its step height preferably controls be 0.8 ~ 1.5mm.Cutting angle for accurately machined stepped ramp type milling blade is less than the cutting angle for rough machined milling blade.
Blisk profile milling processing technology of the present invention, it is a kind of contour cross section technological method for processing, a kind of technique of processing Blisk profile that applicant creates, blade profile is taked to be divided into several layerings by different processing step pitches, in the processing of each layering, first carry out the rough milling between blade profile runner, after rough milling completes, carry out the finish-milling processing of blade profile immediately, now, because the interchannel blank of blade profile is not yet removed, and it is thick, the position of finish-milling processing is thick apart from not carrying out, the root distance of finish-milling processing is very little, this ensure that blade profile working position has enough intensity, therefore, do not need to increase blade processing intensity at blade profile interchannel filling clay thick to complete blade profile, finish-milling is processed, this not only eliminates fills the operation that clay increases blade processing intensity, also improve working (machining) efficiency.The present invention utilizes blisk self structure to carry out blade profile processing, blade profile processing is carried out than filling clay, because the blade of machine-shaping and removed material are integrated, there is not blind, the vibration produced in processing absorbs by by the material being cut removal, therefore can not produce vibration on the surface processed, the blade profile of machine-shaping there will not be the generation causing blade surface chatter mark owing to processing chatter.
The proposition of Blisk profile milling processing technology of the present invention, fully take into account the Milling Process for a blade profile, the surplus that the inlet and outlet limit place Milling Process of blade is removed always is greater than in the middle part of blade profile, therefore, adopt the leaf of prior art to check and regulate body milling process, the cutting force being easy to cause inlet and outlet limit place to bear is larger.So the present invention is when considering milling process, consider first the large surplus at inlet and outlet limit place to be removed, ensure that blade profile is in milling process with this, the cutting force had point of contact is without larger change.
Blisk profile milling processing technology of the present invention, also fully take into account when technological design, in blisk rough milling process, total requirement is that cutter can have larger contact area with part when cutting, and removes to reach large surplus; And in fine finishining, be reduce the vibration that brings of cutting force, require that Tool in Cutting sword is more sharp better, and work in-process and feature contacts area little.Therefore, the present invention uses slightly in the processing of a layering, finish-milling alternately processing, if work in-process, rough mill and use different cutters from finish-milling, then, in process, lathe always ceaselessly can go tool changing, such method cannot ensure the quality of part, its working (machining) efficiency more has no way of improving, and for this reason, devises a kind of milling cutter of new construction especially.This milling cutter is the improvement carried out on the basis of four traditional sword spherical tool, and carried out Curve guide impeller to wherein two-edged, its cutter head end structure is similar to round nose shape, is namely formed by processing about 1mm step on the blade of two symmetries; Add man-hour at coarse milling, cutter mainly uses two bulb swords, and ball sword and part have enough large contact area, and cutter produces less vibration, and the cutting force that part bears is also less.In fine finishining, four cutting edges all participate in cutting, and wherein two step sword work in-processes have enough sharpness, and cutter is sharper, and the cutting force of generation is less, and the distortion that corresponding part produces is less; Two other bulb sword work in-process and feature contacts area are comparatively large, contribute to the surface smoothness improving blade profile.
The present invention has following very outstanding Advantageous Effects:
1, test shows, for the blisk that material, structure are all identical, the method of the invention is adopted to complete roughing compared with traditional diamond-making technique, process-cycle obtains great shortening, roughing shortens to 1:1 with the fine finishining time than by original 10:1, and eliminates semifinishing operation.
2, the method for the invention is adopted, the high strength that blade has is relied on during fine finishining, cutter rotating speed during original fine finishining can be increased to 7640r/min from 800r/min ~ 1200r/min, and Tool in Cutting speed is increased to 2500mm/min by 50mm/min ~ 75mm/min, fine finishining time several times can be shortened.
3, the present invention uses contour Cross Section Method to process, and cutting force, along the release of sustained height direction, reduces helical milling in the past and processes the axial cutting force brought, make blade profile surface luminous intensity higher; Decrease blade profile front and rear edge and add man-hour, the mistake brought because trembling is cut, root face, contracting strength phenomenon.
4, the present invention uses special construction cutter, can take into account the processing of rough milling the requirement of each finish-milling two kinds difference of leaf dish, decrease the error that lathe tool changing brings, ensure that the qualification rate of part.
Accompanying drawing explanation
Accompanying drawing 1 is the Blisk schematic diagram processed.
Accompanying drawing 2 adopts existing technique to open thick process schematic diagram to blisk.
Accompanying drawing 3 adopts existing processes blisk, the chatter mark schematic diagram that processing chatter produces at blade surface.
Accompanying drawing 4-1 is the milling cutter construction schematic diagram that Milling Process of the present invention uses.
Accompanying drawing 4-2 is the structural representation of milling cutter in another direction that Milling Process of the present invention uses.
In above-mentioned accompanying drawing, the object of each shown by reference numeral mark is respectively: 1-milling cutter blade; 2-milling cutter tip; 3-finish-milling sharpener sword; 4-coarse milling blade.
Detailed description of the invention
Provide embodiments of the invention below in conjunction with accompanying drawing, and by embodiment, the present invention is further described specifically.What be necessary to herein means out is; embodiment is only for the invention will be further described; limiting the scope of the invention can not be interpreted as; the person skilled in the art in this field can make some nonessential improvement according to the content of the invention described above and adjustment is implemented, but such enforcement still should belong to protection scope of the present invention.
Embodiment 1
The present embodiment process to as if the blisk of certain model aero-engine, this blisk material is TC17, and diameter is ￠ 613mm, and the model of the five axle milling machines used is LIECHTI g-mill50.To Blisk profile milling technological method for processing, the base substrate of blisk is up fixed on five-axle number control machine tool workbench by blade tip, blisk base substrate is pressed the layering of 0.10mm floor height from the top down along blade stacking direction of principal axis, coarse milling processing is carried out with two-edged with same handle, four swords are used for four blade milling cutters of the ball nose shape and structure of smart Milling Process, first coarse milling processing is carried out to the bladed-disk assemblies profile runner in this floor height scope, again thick smart Milling Process is carried out to the bladed-disk assemblies airfoil surface in this floor height scope, and make the blade in this floor height enter limit, the allowance for finish that exhaust limit and middle part are retained after roughing is equal, after leaf dish-type face in this floor height all processes, reprocess the leaf dish-type face in next floor height, until whole leaf dish processes the structure profile of whole leaf dish from blade tip to petiole layering.In Milling Processes, the rotating speed of milling cutter controls the scope at 5000 ~ 7640r/min.Four blade milling cutters of the described ball nose shape and structure used, are wherein not used in two other blade rough machined, are the blade of stepped ramp type structure, and the finish-milling for bladed-disk assemblies profile is processed, and the step difference of two stepped ramp type blades is about 1.0mm.Use before process of the present invention processes Blisk profile, first program composition is carried out to this part, and set machined parameters and meet requirement in the inventive method.
Applicant adopts the Blisk profile of process of the present invention to several blade profile to process, and the Blisk profile after processing after testing, show that blade profile meets designing requirement completely, and working (machining) efficiency is significantly increased.
Claims (3)
1. a Blisk profile milling technological method for processing, it is characterized in that, the base substrate of blisk is up fixed on five-axle number control machine tool workbench by blade tip, blisk base substrate is pressed the layering of 0.05 ~ 0.15mm floor height from the top down along blade stacking direction of principal axis, coarse milling processing is carried out with two-edged with same handle, four swords are used for four blade milling cutters of the ball nose shape and structure of smart Milling Process, first coarse milling processing is carried out to the bladed-disk assemblies profile runner in this floor height scope, again smart Milling Process is carried out to the bladed-disk assemblies airfoil surface in this floor height scope, after this layer of leaf dish-type face all processes, the lower one deck bladed-disk assemblies profile of reprocessing, until whole leaf dish processes the structure profile of whole leaf dish from blade tip to blade root layering.
2. Blisk profile milling technological method for processing according to claim 1, is characterized in that, retains accurately machined surplus equal after the blade leading edge of this floor height, exhaust limit and middle part roughing.
3. Blisk profile milling technological method for processing according to claim 2, is characterized in that, the cutter rotating speed of Milling Process is 5000 ~ 7640r/min.
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| CN201410681318.0A CN104475842B (en) | 2014-11-24 | 2014-11-24 | A kind of Blisk profile milling technological method for processing |
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| CN201410681318.0A CN104475842B (en) | 2014-11-24 | 2014-11-24 | A kind of Blisk profile milling technological method for processing |
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| CN104475842A true CN104475842A (en) | 2015-04-01 |
| CN104475842B CN104475842B (en) | 2016-08-24 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107159951A (en) * | 2016-11-29 | 2017-09-15 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of integrated impeller blade circulates milling rigidity reinforced method |
| CN110899801A (en) * | 2019-12-24 | 2020-03-24 | 贵阳博亚机械制造有限公司 | Machining tool and machining method for stainless steel parts |
| CN111113092A (en) * | 2019-12-27 | 2020-05-08 | 中国航发湖南南方宇航工业有限公司 | Method for machining impeller blades under clamping of integral impeller clamp |
| WO2021107229A1 (en) * | 2019-11-29 | 2021-06-03 | 주식회사 티씨티 | Impeller machining apparatus and machining method using same |
| CN113377069A (en) * | 2021-05-14 | 2021-09-10 | 苏州千机智能技术有限公司 | Method for generating mixed milling cutter path for machining blisk blade profile |
| CN114700539A (en) * | 2022-04-27 | 2022-07-05 | 西安三航动力科技有限公司 | Composite milling method for five-axis channel of blisk |
| CN115070126A (en) * | 2022-06-29 | 2022-09-20 | 中国航发动力股份有限公司 | A kind of rough machining method of integral blisk parts |
| CN115319419A (en) * | 2022-08-22 | 2022-11-11 | 昆山西诺巴精密模具有限公司 | Processing method and application of titanium alloy blisk |
| CN115555800A (en) * | 2022-06-30 | 2023-01-03 | 苏州千机智能软件有限公司 | Combined milling method for centrifugal impeller with splitter blades |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111113092B (en) * | 2019-12-27 | 2021-06-22 | 中国航发湖南南方宇航工业有限公司 | Method for machining impeller blades under clamping of integral impeller clamp |
| CN113377069A (en) * | 2021-05-14 | 2021-09-10 | 苏州千机智能技术有限公司 | Method for generating mixed milling cutter path for machining blisk blade profile |
| CN113377069B (en) * | 2021-05-14 | 2022-11-08 | 苏州千机智能技术有限公司 | Mixed milling cutter path generation method for machining blisk blade profile |
| CN114700539A (en) * | 2022-04-27 | 2022-07-05 | 西安三航动力科技有限公司 | Composite milling method for five-axis channel of blisk |
| CN114700539B (en) * | 2022-04-27 | 2023-07-18 | 西安三航动力科技有限公司 | Combined milling method for five-axis channels of blisk |
| CN115070126A (en) * | 2022-06-29 | 2022-09-20 | 中国航发动力股份有限公司 | A kind of rough machining method of integral blisk parts |
| CN115070126B (en) * | 2022-06-29 | 2025-02-18 | 中国航发动力股份有限公司 | A rough machining method for integral blade disk parts |
| CN115555800A (en) * | 2022-06-30 | 2023-01-03 | 苏州千机智能软件有限公司 | Combined milling method for centrifugal impeller with splitter blades |
| CN115319419A (en) * | 2022-08-22 | 2022-11-11 | 昆山西诺巴精密模具有限公司 | Processing method and application of titanium alloy blisk |
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Address after: Xindu District of Chengdu city in Sichuan province 610503 Shulong avenue into the industrial park into the Group Technology Center Patentee after: China Hangfa aviation Polytron Technologies Inc Address before: Xindu District of Chengdu city in Sichuan province 610503 Shulong avenue into the industrial park into the Group Technology Center Patentee before: Sichuan Chengfa Aviation Science & Technology Co., Ltd. |