CN108145222A - Enclosed blisk pocketing processing method - Google Patents
Enclosed blisk pocketing processing method Download PDFInfo
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- CN108145222A CN108145222A CN201810001987.7A CN201810001987A CN108145222A CN 108145222 A CN108145222 A CN 108145222A CN 201810001987 A CN201810001987 A CN 201810001987A CN 108145222 A CN108145222 A CN 108145222A
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- curve
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- blisk
- cutter track
- pocketing
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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
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Abstract
The invention discloses a kind of enclosed blisk pocketing processing method, including step 1：Die-cavity roughing machining area divides；Step 2：Determine region division to be processed；Step 3：Tool path planning；The enclosed blisk pocketing processing method being capable of accurate piecemeal, reduce allowance, generating tool axis vector solves simple, realize the five-shaft numerical control processing of high-efficiency closed blisk cavity, improve enclosed blisk processing quality and processing efficiency, it can be applicable in integrated impeller blade Milling Process, be equally applicable in the process of the big overhanging part of other thin-walleds.
Description
Technical field
The present invention relates to NC milling manufacturing technology fields more particularly to a kind of enclosed blisk pocketing to add
Work method.
Background technology
At present, widely used multi-axis NC milling processing both at home and abroad.Enclosed blisk is modern high thrust-weight ratio aviation hair
The new construction that motivation uses, due to its with it is complicated, opening character is poor, blade is thin, the machining deformation control technology characteristics such as difficulty.
Leaf disk-like accessory is the core component of aerospace engine, and the trend of this kind of design of part development is using the enclosed with integral shroud
Overall structure.After enclosed blisk, the aeroperformance and functional reliability of engine are improved significantly.However, it closes
The runner of formula blisk is narrow and is in semi-closed state, and the material of leaf dish is mostly the hard-cutting materials such as titanium alloy, high temperature alloy,
Accurate piecemeal is difficult in enclosed blisk die-cavity roughing of the prior art, allowance is excessive, generating tool axis vector solving complexity,
Processing efficiency is low.This just proposes challenge to manufacturing technology.Therefore, it is necessary to explore novel technological method to solve the above problems.
Invention content
In order to solve the above technical problems, the object of the present invention is to provide one kind can accurate piecemeal, reduce allowance, knife
Axial vector solves simple enclosed blisk pocketing processing method.
A kind of enclosed blisk pocketing processing method proposed by the present invention, includes the following steps：
Step 1：Die-cavity roughing machining area divides；
Step 1.1：Direction of the broad sense cuboid in cavity region to be processed from blade inlet edge to trailing edge is defined as length
Direction is spent, corresponding two boundary surfaces are defined as front edge side boundary surface, rear side boundary surface；
Step 1.2：It is depth direction from shroud to wheel hub direction, corresponding two boundary surfaces are defined as shroud lateral boundaries song
Face, hub side boundary surface；
Step 1.3：Around leaf dish direction of rotation from side blade to opposite side blade for width direction, corresponding two boundary songs
Face is defined as leaf basin lateral boundaries curved surface, blade back lateral boundaries curved surface；
Step 1.4：Curve definitions corresponding to blade inlet edge peak are leading edge polar, where trailing edge minimum point
Curve definitions be rear polar；
Step 1.5：The corresponding leaf pelvic surface of sacrum in blade both sides, leaf back obtain the biasing of leaf basin side to cavity internal bias respectively
Face, blade back side biasing surface, offset or dish is allowance；
Step 2：Determine region division to be processed；
Step 2.1：The boundary surface on regional depth direction to be processed is determined according to specified depth bounds；
Step 2.2：The boundary surface and intermediate hierarchical on segmented areas length direction are determined according to specified length range
Face；
Step 2.3：According on depth direction hub side, shroud lateral boundaries curved surface determine that hub side, shroud lateral boundaries are bent
Line；
Step 2.4：On each layering curved surface, determine that leaf basin side, the boundary of blade back side are bent according to specified width range
Line；
Step 3：Tool path planning；
Step 3.1：On each layering face, region to be processed is defined as broad sense rectangle, by broad sense rectangle both sides institute
Direction principal direction, auxiliary direction are respectively defined as according to its relative length, principal direction is main cutting direction cutter track, auxiliary direction
Mainly connection cutting cutter track.
Step 3.2：By distinguishing major and minor direction so that meet required precision uniformly in the case of cutting every layer walk
Cutter track total path length is most short.
Step 3.3：For each layering face, according to above-mentioned gained leaf basin, blade back lateral boundaries curve, wheel hub, shroud side
Boundary's curve plans each layer of cutter track,
Step 3.4：Cutter track on each layering face is continuous cutting, and transition connection knife is established between two layering faces
Road.
Further, the method for the boundary surface described in step 2.1 on determining regional depth direction to be processed is：Take one
A plane for crossing blisk rotating shaft asks friendship to obtain two curves being located in plane with shroud face and wheel hub surface respectively, will
The parameter discretes such as two curves are identical points to meet required precision, discrete in each correspondence successively according to depth range parameter
Linear interpolation and intermediate interpolated point is fitted between point, generation two correspond to the intermediate bent of depth direction range head and the tail parameter respectively
Line, two intermediate curves just generate the wheel hub side on piecemeal regional depth direction to be processed around the rotating shaft rotation of blisk
Boundary's curved surface, shroud lateral boundaries curved surface.
Further, boundary surface on segmented areas length direction and intermediate hierarchical face are determined described in step 2.2
Method is：The parameter on length direction corresponding to two leading edge, rear polars is respectively 0,1, by specified length range
It is divided into several minizones, i.e., the position in corresponding each layering face；It is identical points by parameter discretes such as two polars
Make to meet required precision, according to the length direction parameter divided equally in length range successively between each corresponding discrete point it is linear
Interpolation is simultaneously fitted intermediate interpolated point, generates the intermediate curve of corresponding length direction hierarchy parameters, intermediate curve is around blisk
Rotating shaft rotation just generates the layering curved surface on piecemeal zone length direction to be processed.
Further, determine that hub side, the method for shroud lateral boundaries curve are described in step 2.3：It is layered curved surface difference
Hub side, shroud lateral boundaries curve are obtained with hub side, shroud lateral boundaries surface intersection；
Further, leaf basin side is determined described in step 2.4, the method for boundary curve of blade back side is：It is layered curved surface point
Do not intersect to obtain leaf basin side, blade back side intersection curve with leaf dish side, blade back side biasing surface；By parameter discretes such as two intersection curves
Make to meet required precision for identical points, be revolved between each corresponding discrete point successively according in width range head and the tail parameter
Turn linear interpolation and be fitted intermediate interpolated point, rotation center is layering face and the intersection point of leaf dish rotating shaft, and generation width direction is treated
The corresponding leaf basin side of machining area, blade back lateral boundaries curve.
Further, principal direction described in step 3.1, the definition mode of auxiliary direction are：Based on the larger definition of length
Direction, another direction are defined as auxiliary direction.
Further, every layer described in the step 3.2 cutter track path computing mode walked is：The cutter track path in major and minor direction point
It is not obtained by above-mentioned corresponding boundary curve interpolation；Since leaf dish is this feature of revolving body, wherein upper slitter in the width direction
Road curve is circular curve, by between the corresponding discrete point of boundary curve rotating linear interpolation obtain.
Further, the planning mode of cutter track described in step 3.3 is：It is " returning " font cutter track to design cutter track type, from
The a certain starting point of boundary is set out respectively, and upper continuous feed is cut, and from coil to coil inwardly reduces in both directions, is reduced step-length satisfaction and is cut
Wide required precision.
Further, the withdrawing cutter track of the transition connection cutter track including last layer described in step 3.4 and next layer into
Knife cutter track.
According to the above aspect of the present invention, the present invention has at least the following advantages：The enclosed blisk pocketing processing method energy
Enough accurate piecemeals reduce allowance, and generating tool axis vector, which solves, simply realizes that the five-shaft numerical control of high-efficiency closed blisk cavity adds
Work improves enclosed blisk processing quality and processing efficiency, can be applicable in integrated impeller blade Milling Process, can also answer
In the process for using the big overhanging part of other thin-walleds.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after attached drawing is coordinated to be described in detail such as.
Description of the drawings
Fig. 1 is enclosed blisk cavity area schematic of the present invention；
Fig. 2 is the cutter track track schematic diagram of the present invention in the width direction；
Fig. 3 is cutter track track schematic diagram of the present invention along depth direction；
Fig. 4 is the road of every layer of cutter track of the invention through schematic diagram.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but be not limited to the scope of the present invention.
Embodiment：A kind of enclosed blisk pocketing processing method, includes the following steps：
Step 1：Die-cavity roughing machining area divides；
Step 1.1：Direction of the broad sense cuboid in cavity region to be processed from blade inlet edge to trailing edge is defined as length
Direction is spent, corresponding two boundary surfaces are defined as front edge side boundary surface, rear side boundary surface；
Step 1.2：It is depth direction from shroud to wheel hub direction, corresponding two boundary surfaces are defined as shroud lateral boundaries song
Face, hub side boundary surface；
Step 1.3：Around leaf dish direction of rotation from side blade to opposite side blade for width direction, corresponding two boundary songs
Face is defined as leaf basin lateral boundaries curved surface, blade back lateral boundaries curved surface；
Step 1.4：Curve definitions corresponding to blade inlet edge peak are leading edge polar, where trailing edge minimum point
Curve definitions be rear polar；
Step 1.5：The corresponding leaf pelvic surface of sacrum in blade both sides, leaf back obtain the biasing of leaf basin side to cavity internal bias respectively
Face, blade back side biasing surface, offset or dish is allowance；
Step 2：Determine region division to be processed；
Step 2.1：The boundary surface on regional depth direction to be processed is determined according to specified depth bounds；
Step 2.2：The boundary surface and intermediate hierarchical on segmented areas length direction are determined according to specified length range
Face；
Step 2.3：According on depth direction hub side, shroud lateral boundaries curved surface determine that hub side, shroud lateral boundaries are bent
Line；
Step 2.4：On each layering curved surface, determine that leaf basin side, the boundary of blade back side are bent according to specified width range
Line；
Step 3：Tool path planning；
Step 3.1：On each layering face, region to be processed is defined as broad sense rectangle, by broad sense rectangle both sides institute
Direction principal direction, auxiliary direction are respectively defined as according to its relative length, principal direction is main cutting direction cutter track, auxiliary direction
Mainly connection cutting cutter track.
Step 3.2：By distinguishing major and minor direction so that meet required precision uniformly in the case of cutting every layer walk
Cutter track total path length is most short.
Step 3.3：For each layering face, according to above-mentioned gained leaf basin, blade back lateral boundaries curve, wheel hub, shroud side
Boundary's curve plans each layer of cutter track,
Step 3.4：Cutter track on each layering face is continuous cutting, and transition connection knife is established between two layering faces
Road.
The method of boundary surface on regional depth direction to be processed is determined described in step 2.1 is：Take one it is excessively whole
The plane of leaf dish rotating shaft asks friendship to obtain two curves being located in plane, by two curves with shroud face and wheel hub surface respectively
Wait parameter discretes for identical points to meet required precision, according to the depth range parameter successively line between each corresponding discrete point
Property interpolation and be fitted intermediate interpolated point, two intermediate curves for corresponding to depth direction range head and the tail parameter respectively are generated, in two
Half interval contour rotates the hub side boundary surface just generated on piecemeal regional depth direction to be processed around the rotating shaft of blisk, encloses
Band lateral boundaries curved surface.
The method that boundary surface and intermediate hierarchical face on segmented areas length direction are determined described in step 2.2 is：Before
The parameter on length direction corresponding to two edge, rear polars is respectively 0,1, specified length range is divided into several
A minizone, i.e., the position in corresponding each layering face；The parameter discretes such as two polars are made to meet precision for identical points
It is required that it linear interpolation and is fitted between each corresponding discrete point successively according to the length direction parameter divided equally in length range
Intermediate interpolated point, generates the intermediate curve of corresponding length direction hierarchy parameters, and intermediate curve is rotated around the rotating shaft of blisk
Just the layering curved surface on generation piecemeal zone length direction to be processed.
Hub side, the method for shroud lateral boundaries curve are determined described in step 2.3 is：Be layered curved surface respectively with hub side,
Shroud lateral boundaries surface intersection obtains hub side, shroud lateral boundaries curve；
Leaf basin side is determined described in step 2.4, the method for boundary curve of blade back side is：Be layered curved surface respectively with leaf dish
Side, blade back side biasing surface intersect to obtain leaf basin side, blade back side intersection curve；It is identical by parameter discretes such as two intersection curves
Points make to meet required precision, are inserted according to rotating linear is carried out between each corresponding discrete point successively in width range head and the tail parameter
It is worth and is fitted intermediate interpolated point, rotation center is layering face and the intersection point of leaf dish rotating shaft, generates width direction region to be processed
Corresponding leaf basin side, blade back lateral boundaries curve.
Principal direction described in step 3.1, the definition mode of auxiliary direction are：It is principal direction by the larger definition of length, it is another
A direction is defined as auxiliary direction.
Every layer described in the step 3.2 cutter track path computing mode walked be：The cutter track path in major and minor direction is respectively by above-mentioned institute
Corresponding boundary curve interpolation obtains；Since leaf dish is this feature of revolving body, wherein upper cutter track curve is round in the width direction
Curved line, by between the corresponding discrete point of boundary curve rotating linear interpolation obtain.
The planning mode of cutter track described in step 3.3 is：It is " returning " font cutter track to design cutter track type, a certain from boundary
Starting point is set out respectively, and upper continuous feed is cut, and from coil to coil inwardly reduces in both directions, and diminution step-length satisfaction cuts wide precision will
It asks.
Transition connection cutter track described in step 3.4 includes the withdrawing cutter track and next layer of feed cutter track of last layer.
The enclosed blisk pocketing processing method, the cutter used are hard alloy bulb milling cutter (including staight shank
Rose cutter and taper shank rose cutter), specific processing method is at length of blade direction (i.e. blade inlet edge to rear direction)
Carry out layering processing, every layer is processed by the way of font " is returned " from inside to outside, feed mode be oblique line feed, the technique
Method focuses on the generation of cutter location and the interference checking of cutter shaft.
The concrete operation step of process is：
The first, primary blades, left and right adjacent blades, shroud, the allowance of wheel hub and in front and rear edge are set on numerically-controlled machine tool
The propagation of position；
The 2nd, the initial position (front edge side or rear side) of processing and the cavity type of milling are set on numerically-controlled machine tool
(levorotation chamber or right cavity)；
The 3rd, the machining area of cavity, radially layered number on numerically-controlled machine tool are set and cut width；
The 4th, the collision detection points of cutter and knife-axial controlling angle are set on numerically-controlled machine tool；
The 5th, specific size, rotating speed and the amount of feeding of cutter are set on numerically-controlled machine tool.
The enclosed blisk pocketing processing method can accurate piecemeal, reduce allowance, generating tool axis vector solve
Simply, it realizes the five-shaft numerical control processing of high-efficiency closed blisk cavity, improves enclosed blisk processing quality and processing
Efficiency,
The above is only the preferred embodiment of the present invention, is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of enclosed blisk pocketing processing method, it is characterised in that：Include the following steps：
Step 1：Die-cavity roughing machining area divides；
Step 1.1：It is length side to define direction of the broad sense cuboid in cavity region to be processed from blade inlet edge to trailing edge
To corresponding two boundary surfaces are defined as front edge side boundary surface, rear side boundary surface；
Step 1.2：From shroud to wheel hub direction for depth direction, corresponding two boundary surfaces be defined as shroud lateral boundaries curved surface,
Hub side boundary surface；
Step 1.3：Around leaf dish direction of rotation from side blade to opposite side blade for width direction, corresponding two boundary surfaces are determined
Justice is leaf basin lateral boundaries curved surface, blade back lateral boundaries curved surface；
Step 1.4：Curve definitions corresponding to blade inlet edge peak are leading edge polar, the song where trailing edge minimum point
Line is defined as rear polar；
Step 1.5：The corresponding leaf pelvic surface of sacrum in blade both sides, leaf back obtain leaf basin side biasing surface, leaf to cavity internal bias respectively
Back side biasing surface, offset or dish are allowance；
Step 2：Determine region division to be processed；
Step 2.1：The boundary surface on regional depth direction to be processed is determined according to specified depth bounds；
Step 2.2：Boundary surface on segmented areas length direction and intermediate hierarchical face are determined according to specified length range；
Step 2.3：According on depth direction hub side, shroud lateral boundaries curved surface determine hub side, shroud lateral boundaries curve；
Step 2.4：On each layering curved surface, the boundary curve of leaf basin side, blade back side is determined according to specified width range；
Step 3：Tool path planning；
Step 3.1：On each layering face, region to be processed is defined as broad sense rectangle, it will be where broad sense rectangle both sides
Direction is respectively defined as principal direction, auxiliary direction according to its relative length, and principal direction is main cutting direction cutter track, and auxiliary direction is main
It is connection cutting cutter track.
Step 3.2：By distinguishing major and minor direction so that every layer of cutter track walked in the case where meeting required precision and uniformly cutting
Total path length is most short.
Step 3.3：For each layering face, according to above-mentioned gained leaf basin, blade back lateral boundaries curve, wheel hub, shroud lateral boundaries are bent
Line plans each layer of cutter track,
Step 3.4：Cutter track on each layering face is continuous cutting, and transition connection cutter track is established between two layering faces.
2. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 2.1
The method for stating the boundary surface on determining regional depth direction to be processed is：A plane for crossing blisk rotating shaft is taken, point
Friendship is not asked to obtain two curves being located in plane with shroud face and wheel hub surface, is identical point by parameter discretes such as two curves
Number linear interpolation and is fitted intermediate interpolated between each corresponding discrete point successively to meet required precision, according to depth range parameter
Point, generates two intermediate curves for corresponding to depth direction range head and the tail parameter respectively, and two intermediate curves are returned around blisk
Shaft rotation just generates hub side boundary surface, shroud lateral boundaries curved surface on piecemeal regional depth direction to be processed.
3. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 2.2
The method for stating boundary surface and intermediate hierarchical face on determining segmented areas length direction is：Two leading edge, rear polar institutes
Parameter on corresponding length direction is respectively 0,1, and specified length range is divided into several minizones, i.e., corresponding each
The position in layering face；The parameter discretes such as two polars are made to meet required precision for identical points, according in length range
Interior divided equally length direction parameter linear interpolation and is fitted intermediate interpolated point between each corresponding discrete point successively, and generation corresponds to
The intermediate curve of length direction hierarchy parameters, intermediate curve just generate piecemeal region to be processed around the rotating shaft rotation of blisk
Layering curved surface on length direction.
4. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 2.3
State determining hub side, the method for shroud lateral boundaries curve is：Layering curved surface obtains respectively with hub side, shroud lateral boundaries surface intersection
To hub side, shroud lateral boundaries curve.
5. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 2.4
State determining leaf basin side, the method for boundary curve of blade back side is：Layering curved surface intersects respectively with leaf dish side, blade back side biasing surface
To leaf basin side, blade back side intersection curve；The parameter discretes such as two intersection curves are made to meet required precision, root for identical points
According to carrying out rotating linear interpolation and being fitted intermediate interpolated point between each corresponding discrete point successively in width range head and the tail parameter, revolve
Turn center as layering face and the intersection point of leaf dish rotating shaft, the corresponding leaf basin side in generation width direction region to be processed, blade back side
Boundary's curve.
6. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 3.1
State principal direction, the definition mode of auxiliary direction is：It is principal direction by the larger definition of length, another direction is defined as auxiliary direction.
7. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Described in step 3.2
Every layer of cutter track path computing mode walked be：The cutter track path in major and minor direction is respectively by above-mentioned corresponding boundary curve interpolation
It obtains；Since leaf dish is this feature of revolving body, wherein upper cutter track curve is circular curve in the width direction, by boundary song
Rotating linear interpolation obtains between the corresponding discrete point of line.
8. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 3.3
Stating the planning mode of cutter track is：It is " returning " font cutter track to design cutter track type, from a certain starting point of boundary respectively along two
Continuous feed cutting on direction, and from coil to coil inwardly reduces, and reduces step-length satisfaction and cuts wide required precision.
9. enclosed blisk pocketing processing method according to claim 1, it is characterised in that：Institute in step 3.4
The transition connection cutter track stated includes the withdrawing cutter track and next layer of feed cutter track of last layer.
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| CN110695422A (en) * | 2019-11-11 | 2020-01-17 | 苏州千机智能技术有限公司 | Milling method for fixed shaft of closed blisk cavity |
| CN110711883A (en) * | 2019-11-11 | 2020-01-21 | 苏州千机智能技术有限公司 | Blisk runner side surface cycloid milling rough machining method |
| CN112230602A (en) * | 2020-09-09 | 2021-01-15 | 广州中望龙腾软件股份有限公司 | Cavity secondary rough cutter path planning method and device and storage medium |
| CN113182565A (en) * | 2021-03-30 | 2021-07-30 | 成都飞机工业（集团）有限责任公司 | Weak-rigidity molded surface regional milling method |
| CN113199068A (en) * | 2021-03-31 | 2021-08-03 | 成都飞机工业（集团）有限责任公司 | Machining method for sharp corner structure of glass fiber reinforced plastic part |
| 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 |
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| 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 |
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