CN103984289B - Complex structural member different mountain feature self adaptation determines method around Profile milling cutter rail - Google Patents
Complex structural member different mountain feature self adaptation determines method around Profile milling cutter rail Download PDFInfo
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- 230000007704 transition Effects 0.000 claims description 15
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Abstract
A kind of complex structural member different mountain feature self adaptation determines method around Profile milling cutter rail, it is characterized in that first setting up the Cutter coordinate system of part, obtains the different mountain feature in part, and divides different mountain feature by layer, obtains the machining area of each layer；Then obtained the driving line of each layer by method of section, obtained the cutter spacing line of processing by offsetting, add the advance and retreat cutter mode needed, generate complete process tool track.The Milling Process cutter rail that the present invention generates is accurate, it is possible to reduce the empty feed stroke in the course of processing, improves the working (machining) efficiency of part, can improve the crudy of part simultaneously.
Description
Technical field
The present invention relates to a kind of part by numerical control processing method, particularly relate to the profile milling of aircraft complex structural member different mountain feature
Self adaptation around milling cutter rail computational methods, a kind of utilizes Digit Control Machine Tool to the different mountain feature in aircraft complex structural member
Carry out the cutter rail computational methods of milling around its physical model outer contour shape, belong to CAD/CAPP/CAM technical field.
Background technology
Along with developing rapidly of Aeronautical Manufacturing Technology in China, in the manufacture of present generation aircraft, Digit Control Machine Tool processing aircraft is multiple
The application of miscellaneous structural member is more and more extensive.Aircraft complex structural member is the important composition portion of airframe skeleton and aerodynamic configuration
Point.It has the features such as complex-shaped, size is big, requirement on machining accuracy is high, rigidity is little, process technology difficulty is big, aircraft complex
Efficiency and the quality of structural member processing will directly affect quality and the manufacturing cycle of aircraft.
In view of the feature of aircraft complex structural member, according to statistics in the large-scale overall frame class part of aircraft more than 90%, groove
Ratio shared by feature is about 98%.Due to Airplane frame class part, usually profile exist a lot in cavity feature
Labyrinth, causes part inner mold to add technological requirement height in man-hour, and difficulty of processing increases, and working (machining) efficiency is low, and crudy can not be protected
Card, and when writing this part nc program, programming personnel's amount of labour is big.Especially in long interior profile,
On the one hand in order to alleviate weight during design, on the one hand in order to ensure the strength and stiffness requirement of part, in long interior profile modeling
Time often occur that continuous print laciniation, the so multiple continuous print laciniations in an interior profile are referred to as different mountain
Feature.
For this different mountain feature, traditional processing method is: using different mountain feature as an overall structure, find its end
The driving line that portion is maximum, utilizes an operation to complete the processing of different mountain feature, end face and transition face and processes as muscle part.Due to
The reason of groove type thin-walled, traditional processing method not only programing work amount is big especially, occurs playing cutter, broaching tool phenomenon, Er Qiehui
There is the excessive ratio of a large amount of empty feed stroke, particularly different mountain feature end face and bottom surface in the case of shallower, actual feed
Empty feed stroke is bigger, causes working (machining) efficiency low, so that the manufacturing cycle of aircraft extends.
The targeted complex structural member different mountain feature ring of the present invention is around the cutter rail computational methods of its Profile milling, the cutter of generation
Rail is to be processed around different mountain feature outline according to cutting-in, has the advantage that
1) the Milling Process cutter rail generated is accurate, it is possible to carry out batch processing, reduces the programing work amount of technologist.
2) the empty feed stroke in the course of processing can be reduced, improve the working (machining) efficiency of part.
3) machining deformation of part can be reduced, improve the crudy of part.
Different mountain feature ring is primarily adapted for use in aircraft complex knot around the cutter rail computational methods of its Profile milling and the cutter rail of generation
Component different mountain feature.Up to the present, the disclosed complex structural member different mountain feature ring cutter around its Profile milling not yet it is found to have
Rail computational methods.
Summary of the invention
The purpose of the present invention is primarily directed to the different mountain feature of complex structural member and processes present in NC Machining Process
The problems such as efficiency is low, and crudy is bad, a kind of complex structural member different mountain feature self adaptation of invention is true around Profile milling cutter rail
Determine method, to improve working (machining) efficiency and crudy.
Technical scheme is as follows:
A kind of complex structural member different mountain feature self adaptation determines method around Profile milling cutter rail, it is characterized in that it include with
Lower step:
Step 1: input material object parts model, sets Cutter coordinate system；
Step 2: obtain different mountain feature, and different mountain feature is divided by layer；
Step 3: the Rotating fields divided by different mountain feature, determines machining area；
Step 4: automatically generate required reference plane；
Step 5: obtain the driving line of different mountain feature machining；
Step 6: obtain each layer of cutter spacing line of different mountain feature machining；
Step 7: make the cutter spacing line of each layer of generation close；
Step 8: feed point and withdrawing point are set；
Step 9: the advance and retreat cutter of each layer of process operation is set；
Step 10: the cutter spacing line of every layer is connected, generates complete processing cutter rail；
When the side of milling different mountain feature, cutter carries out milling around different mountain feature, and cutter is always positioned at group simultaneously
, there is not sky feed stroke in the position of peak feature current milling region fixed range；
Described different mountain feature refers to the continuous zigzag physical model in complex structural member, and its geometric constitution mainly wraps
Include: side S, end face T, bottom surface B, horizontal slice face L, transition face F and limit face R, have between each geometric constitution and to determine
Annexation.
Described described acquisition different mountain feature is to use man-machine interactively and automatically identify that the method combined is carried out, by zero
Part physical model clicks side and determines the different mountain feature needing processing, according to selected side and different mountain feature geometries element it
Between annexation automatically identify other geometric elements that this different mountain feature comprises.
It is to divide using the end face in different mountain feature, layering face and bottom surface as layer that described different mountain feature is carried out dividing by layer
Basis, obtain the ring that each face is intersected with different mountain feature, from end face begin look for ought above place ring closest and
Same level can comprise ought the above ring of place ring and its plane produced, thus obtain a layer of different mountain feature.
The described Rotating fields divided by different mountain feature, determines that machining area is on the basis of obtained layer, will
The region comprised between the geometric element of layer is defined as this layer of corresponding machining area.
The described required reference plane that automatically generates refers to the bottom surface according to each layer of the different mountain feature obtained and manually sets
The bias put, normal direction and outwardly direction along bottom surface automatically generate required reference plane.
The described end face and the height of reference plane that drive line to be based on each layer of different mountain feature that obtain different mountain feature machining
Degree difference h, in conjunction with cutting-in parameter M of processingα, use method of section to obtain the driving line of each layer of different mountain feature.
Based on the described each layer of cutter spacing line obtaining different mountain feature machining is the driving line to obtain, according to processing cutter
The diameter of tool and the artificial margin value arranged will drive line along the outwardly biased cutter spacing line obtaining correspondence of its place plane automatically.
The cutter spacing line closing of described each layer that makes generation is adjacent end points and the processing of the cutter spacing line adjacent with two
Based on the radius of cutter, uniquely determine a circular arc by and a radius at 2, make the cutter spacing line of generation close.
The different mountain characterizing definition that the present invention relates to is as follows: different mountain feature is used for describing in complex structural member and one often occurs
Zigzag physical model continuously, as shown in Figure 2.The geometric constitution of different mountain feature specifically includes that side S, end face T, bottom surface B, water
Divide aspect L, transition face F and restriction face R equally.Side S is the basis of different mountain feature, divides with end face, bottom surface and all of level
Aspect is connected and in convex annexation；All horizontal planes included in different mountain feature are divided according to the height of Z-direction, takes height
The horizontal plane of degree peak is end face T, and minimum for bottom surface B, remaining horizontal plane is then for horizontal slice face L；Remove between horizontal plane
Joint face outside side is referred to as transition face F, and transition face is generally arc surface or inclined-plane is constituted；It is special that restriction face is used for limiting different mountain
The scope levied, such as the face R in Fig. 21And R2, restriction face can be divided into open according to the connection in the face of restriction and close two kinds
Type, open restriction face refers to the being not closed property constraint of restriction face place, and this limit face and transition face are convex annexation, such as Fig. 2
Middle R2Shown in, the restriction face of closing refers to that restriction face place exists closure constraint, and this limit face is recessed connection with transition face, as
Face R in Fig. 21Shown in, different restriction face types will correspond to different cutting strategies.
The expression of different mountain feature:
In different mountain feature, aspect is designated asI-th layer of side is the common side of different mountain feature, is designated asI-th layer of end face, is designated asI-th layer of transition face, is designated asI-th layer limits face, is designated asIf unrestricted face, then it is designated asLayer can be expressed as the intersection of these face types, is designated as:Thus it is divided into series of layers to represent the geometry topology of different mountain feature, it is designated as: P=∪
Lt, t=1,2 ....
The invention has the beneficial effects as follows:
The present invention generates that the speed of complex structural member different mountain feature Milling Process cutter rail is fast, accuracy is the highest, it is possible to enter
Row batch processing；The empty feed stroke in the course of processing can be reduced；The stability of the course of processing can be increased, reduce part
Machining deformation；Improving crudy and the working (machining) efficiency of part, the method is specific around different mountain feature outline milling simultaneously
The feature cut is a kind of cutter rail mode that a lot of commercialization CAM software cannot realize.
The Milling Process cutter rail that the present invention generates is accurate, it is possible to reduce the empty feed stroke in the course of processing, improves part
Working (machining) efficiency, the crudy of part can be improved simultaneously.
Accompanying drawing explanation
Fig. 1 is that the complex structural member different mountain feature ring of the present invention determines method flow diagram around the cutter rail of its Profile milling.
Fig. 2 is the different mountain feature schematic diagram of the present invention.
Fig. 3 is different mountain structure ring and the machining area structural representation of the present invention.
Fig. 4 is the different mountain Dividing Characteristics algorithm flow chart of the present invention.
Fig. 5 is that the method for section that uses of the present invention generates the schematic diagram driving line in each layer of side of different mountain feature.
Fig. 6 is that each layer of cutter spacing line of the present invention generates and enclosure method schematic diagram.
Fig. 7 is the feed point of the present invention and withdrawing point arranges schematic diagram.
Fig. 8 is the different mountain feature used in the example of the present invention.
Fig. 9 is the cutter rail comparison diagram using traditional milling method and the inventive method to obtain.
Detailed description of the invention
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 19.
The cutter rail that a kind of complex structural member different mountain feature ring carries out milling around its profile determines method, whole step such as Fig. 1
Shown in, it includes following ten steps:
Step 1, the input of material object parts model, set Cutter coordinate system.
Step 2, acquisition different mountain feature, and different mountain feature is divided by layer.
As shown in Figure 8, the acquisition of different mountain feature uses man-machine interactively and automatically identifies combination the different mountain feature of the present embodiment
Method: first click in material object parts model side determine need processing different mountain feature, automatic according to selected side
Identify other geometric elements that this different mountain feature comprises, and judge restriction face type: extract with this side be convex be connected own
Horizontal plane, calculates Z-direction height, and the face taking Z-direction height maximum is end face T, and the face of Z-direction height minimum is bottom surface B, and its lap is L；
Extract the face being connected with T, B and L, remove side S, be designated as transition face F；Extract the joint face of each transition face, if this transition face
Joint face in there is the face in addition to S, T, B and L, then this face is restriction face, if this restriction face is recessed connection with transition face,
Then belonging to closing restriction face, if being convex connection with transition face, belonging to open restriction face.
After obtaining the geological information of different mountain feature, need to solve each horizontal plane comprising T, B and L and determined
Machining area, generate the reasonable processing sequence between each processing level, thus generate the cutter path of optimization, concrete grammar is such as
Under: 1) for a horizontal plane Pi, reject the closing in different mountain feature and limit face and Pi, residue face list is denoted as FLi, seek PiWith
FLiIntersection row ELi, according to connectivity, by ELiIt is divided into multiple linkage section, including closed-loop and non-close ring, it is judged that each
Linkage section and PiAnnexation, and if PiIntersect at PiBorder, then be stored in circular row table Pi_ EL and circular row table P_EL；2) for
End face T and layering face L is by being highly ranked up；3) from the beginning of end face, each horizontal plane PiProjection to B place, bottom surface plane obtains
To closed-loop F_EL, circular row table P_EL searches the ring nearest for ring F_EL obtaining can comprising and distance ought above be projected
Pi_ EL and its face P producedi；4) horizontal plane PiWith ring PiThe different mountain part comprised between _ EL [j] is the processing of this layer
Region.Different mountain structure ring and machining area structural representation are as shown in Figure 3.
The method that different mountain characteristic layer divides: 1. on the basis of material object parts mode input, selects the public of different mountain feature
Side, obtains different mountain feature；2. by common side, connected all horizontal planes are obtained, and by all horizontal planes by height
Degree is ranked up, and is stored in the row FaceList of face；3., from the beginning of the i-th from the row FaceList of face, present level face institute is obtained
The intersection of plane and different mountain feature；4. the circular row of all intersections composition is obtained；5. from the beginning of first ring, it is judged that this ring is
The no limit comprising present level face, if comprising the limit in present level face, is then stored in circular row table LoopList, if not by this ring
Comprise, continue to judge, jump to step 5.；6. judge whether i is less than the quantity of face row FaceList, if it is lower, jump to step
③；7., from horizontal plane list FaceList from the beginning of jth, ring Loop [j] circulation of the border composition obtaining this horizontal plane is looked into
Look for distance the shortest when front ring, and comprise the ring LoopList [k] when front ring；8. ring Loop [j] place plane FaceList [j] and
LoopList [k] place plane area encompassed constitutes a layer of different mountain feature, is stored in layers list；9. whether j is judged
Less than the quantity of FaceList, if it is lower, jump to step 7..Travel through all of ring, obtain the complete layer of different mountain feature
Divide.The algorithm flow chart that different mountain characteristic layer divides is as shown in Figure 4.
Step 3, the Rotating fields divided by different mountain feature, determine machining area.
The geometric element that different mountain feature is each layer constitute the bottom surface of the machining area of this layer, i.e. this layer, end face, side and
Transition face constitutes the machining area of different mountain this layer of feature, thus all of layer has collectively constituted the processing district that different mountain feature is complete
Territory.
Step 4, the bottom surface of foundation selection and set bias, the normal direction outwardly direction along bottom surface automatically generates institute
The reference plane needed；
Step 5, the driving line of acquisition different mountain feature machining, as shown in Figure 5.
According to each different mountain end face and difference in height h of reference plane, in conjunction with cutting-in parameter M of processingα, obtain drive surface
Number of plies n.The computational methods of described drive surface number of plies n are:
In formula, h is the distance between end face and reference plane, MαFor the cutter cutting-in parameter of processing, [] is for rounding symbol.
Every layer of drive surface from the distance of end face is:
Lt=i × Mα, 0≤i≤n
Work as Ln＞ h, Ln=h
Use method of section, the machining area of every layer of drive surface and different mountain feature is asked friendship, obtain each top of different mountain feature
The driving line of each layer in the machining area that face is corresponding.
Step 6, according to tool radius, the line that drives generated is obtained discrete cutter along the drive surface at its place is outwardly biased
Bit line.
Step 7, end points a according to adjacent two scattered cutter spacing lines1、b1With the summit o driving line1Three some structures one
Section circular arc makes these two cutter spacing lines close, and in like manner constructs circular arc between other scattered cutter spacing lines, so that whole cutter spacing line
Close, as shown in Figure 6.
Step 8, select cutter spacing line the longest in one layer, each machining area the same side, find intermediate point, feed point is set
With withdrawing point, as shown in Figure 7.
Step 9, a process operation is set with each layer, circular arc feed and circular arc withdrawing are set, and at last layer
Axial feed is added before circular arc feed.
Step 10, the cutter spacing line of every layer is connected, generate complete processing cutter rail, as shown in Figure 9.
Part that the present invention does not relate to is same as the prior art maybe can use prior art to be realized.
Claims (8)
1. complex structural member different mountain feature self adaptation determines a method around Profile milling cutter rail, it is characterized in that it includes following
Step:
Step 1: input material object parts model, sets Cutter coordinate system；
Step 2: obtain different mountain feature, and different mountain feature is divided by layer；
Step 3: the Rotating fields divided by different mountain feature, determines machining area；
Step 4: automatically generate required reference plane；
Step 5: obtain the driving line of different mountain feature machining；
Step 6: obtain each layer of cutter spacing line of different mountain feature machining；
Step 7: make the cutter spacing line of each layer of generation close；
Step 8: feed point and withdrawing point are set；
Step 9: the advance and retreat cutter of each layer of process operation is set；
Step 10: the cutter spacing line of every layer is connected, generates complete processing cutter rail；
When the side of milling different mountain feature, cutter carries out milling around different mountain feature, and cutter is always positioned at different mountain spy simultaneously
Levy the position of current milling region fixed range, there is not sky feed stroke；
Described different mountain feature refers to the continuous zigzag physical model in complex structural member, and its geometric constitution specifically includes that
Side S, end face T, bottom surface B, horizontal slice face L, transition face F and restriction face A, have the connection determined between each geometric constitution
Relation.
2. the method for claim 1, is characterized in that described acquisition different mountain feature is to use man-machine interactively and automatically know
The method not combined is carried out, and the different mountain feature needing to process by clicking side to determine in material object parts model, according to institute
The annexation between side and different mountain feature geometries element is selected automatically to identify other geometric elements that this different mountain feature comprises.
3. the method for claim 1, it is characterized in that described different mountain feature carries out division by layer is with in different mountain feature
The basis that divides as layer of end face, horizontal slice face and bottom surface, obtain the ring that each face is intersected with different mountain feature, open from end face
Begin to search ought above place ring closest and same level can comprise ought above the ring of place ring and its produce
Plane, thus obtain a layer of different mountain feature.
4. the method for claim 1, be is characterized in that the described Rotating fields divided by different mountain feature, determines processing district
Territory is on the basis of obtained layer, and the region comprised between the geometric element of layer is defined as this layer of corresponding processing
Region.
5. the method for claim 1, is characterized in that the described required reference plane that automatically generates refers to according to acquisition
The bottom surface that different mountain feature is each layer and the artificial bias arranged, normal direction and outwardly direction along bottom surface automatically generate required
Reference plane.
6. the method for claim 1, is characterized in that the described driving line obtaining different mountain feature machining is based on different mountain
End face that feature is each layer and difference in height h of reference plane, in conjunction with the cutting-in parameter of processing, use method of section to obtain different mountain special
Levy the driving line of each layer.
7. the method for claim 1, it is characterized in that the described each layer of cutter spacing line obtaining different mountain feature machining be with
Based on the driving line obtained, driving line is put down by diameter and the artificial margin value arranged according to process tool automatically along its place
Face out biasing and obtain the cutter spacing line of correspondence.
8. the method for claim 1, it is characterized in that the cutter spacing line of described each layer that makes generation is closed is with two
Based on the adjacent end points of adjacent cutter spacing line and the radius of process tool, uniquely determine a circle by and a radius at 2
Arc, makes the cutter spacing line of generation close.
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| CN104216335B (en) * | 2014-09-02 | 2016-09-14 | 南京航空航天大学 | Passageway machining method between the casing boss of feature based |
| CN104570948B (en) * | 2015-01-16 | 2017-07-11 | 南京航空航天大学 | Space flight plate parts hole characteristic processing method |
| CN106681278B (en) * | 2017-03-07 | 2019-02-22 | 清华大学 | Cutter and workpiece instant contact contour extraction method during five axis Flank machinings |
| CN107127401B (en) * | 2017-03-20 | 2019-01-18 | 广东长盈精密技术有限公司 | Numerically controlled processing equipment and its continuous process to matrix arrangement form workpiece |
| CN114115118B (en) * | 2022-01-24 | 2022-06-10 | 广州中望龙腾软件股份有限公司 | Tool path generation method and equipment for automatically identifying groove characteristics and storage medium |
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