CN104462656B - Aircraft skin part feature recognition methods - Google Patents
Aircraft skin part feature recognition methods Download PDFInfo
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- CN104462656B CN104462656B CN201410636421.3A CN201410636421A CN104462656B CN 104462656 B CN104462656 B CN 104462656B CN 201410636421 A CN201410636421 A CN 201410636421A CN 104462656 B CN104462656 B CN 104462656B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000003754 machining Methods 0.000 claims abstract description 14
- 238000003801 milling Methods 0.000 claims abstract description 6
- 238000007665 sagging Methods 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 238000013386 optimize process Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004801 process automation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
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Abstract
A kind of aircraft skin part feature recognition methods, it is characterised in that it comprises the following steps：First, analysis of aircraft skin part design feature and processing characteristics define all kinds of covering machining features；Second, ring property figure and holographic attribute face edge graph are pre-seted and are built to skin part, the seed face of all kinds of covering machining features is defined, and the seed face of various features is searched for based on ring property figure and holographic attribute face edge graph；3rd, scanned for based on reverse side identified surface, seed face and expansion rule, search out all geometric elements of each category feature, build covering machining feature；4th, all kinds of characteristic informations are extracted, feature recognition result is obtained.The present invention can cover the characteristic type of aircraft skin part Milling Process, and recognition efficiency is high, and accuracy is high, be that the high-efficient automatic of covering processing is laid a good foundation, while providing effective means for the data transfer between CAD/CAPP/CAM systems.
Description
Technical field
The present invention relates to a kind of CAD/CAM technologies, especially a kind of CAD/CAM for improving aircraft skin part level of processing
Technology, specifically a kind of aircraft skin part feature recognition methods.
Background technology
At present, CAD, CAPP, CAM system have played very big respectively in terms of product design, technological design and numerical control programming
Effect.But these systems are each independent, it is impossible to realize automatic conversion of the information between each system and share, in application process
Automaticity and efficiency are low.For the purpose of improving product design, technological design sum control-register process automation degree and efficiency
CAD/CAPP/CAM is integrated into the active demand for industrial quarters, and feature can be used as the load of processing technology knowledge and experience
Body, effectively inherits processing technology knowledge and experience, the data transfer that can realize between each system by feature, realizes CAD/
CAPP/CAM is integrated.
Feature based can realize numerical control program establishment rapidly and efficiently, and the quick journey that feature recognition is feature based is compiled
The basis of technology.So feature identification technique becomes the important means for improving aircraft skin part by numerical control programming efficiency and quality.
And as skin part belongs to single part or hyperbolic part, its head is even more present with the skin part at tail
The situation of Varying-thickness, even variable cross-section, also there are many broken faces in addition to variable curvature, brings to feature recognition tired
Difficulty, in existing feature identification technique, does not have, for the curvature part with intersecting features, not covering aircraft skin part feature
Type, also cannot be processed to the situation that there is broken face, so the also no efficient recognition methods of feature recognition to aircraft skin.
The content of the invention
The purpose of the present invention is the feature recognition function of lacking aircraft skin for current feature identification technique, it is impossible to broken
This present situation that face is processed, invents a kind of aircraft skin characteristic recognition method.
The technical scheme is that：
A kind of aircraft skin part feature recognition methods, it is characterised in that it comprises the following steps：
First, analysis of aircraft stressed-skin construction feature and processing characteristics define all kinds of covering machining features；
Second, ring property figure and holographic attribute face edge graph are pre-seted and are built to aircraft skin part, are pre-seted master
Including：Set up Cutter coordinate system, select reverse side identified surface and part model input；Define the kind of all kinds of covering machining features
Sub- face, searches for the seed face of each category feature based on ring property figure and holographic attribute face edge graph；
3rd, process is optimized to the seed face with broken face, reverse side identified surface, seed face is then based on and is expanded rule
Then scan for, search out all geometric elements of each category feature, construct covering machining feature；
4th, all kinds of characteristic informations are extracted, feature recognition result is obtained.
It is of the present invention by analysis of aircraft skin part design feature and processing characteristics, will be with process similarity and several
The geometrical body of what information is defined as covering machining feature includes that definition is sunk, leads to window, hole and contour feature.Undercut nature is to cover
The bottom surface of undercut nature, mainly comprising top surface, base angle face and bottom surface, is defined as the seed face of undercut nature by the shallow slot on skin；
Logical window is characterized in that on covering the position for needing to wear using Milling Process milling, shows as in shape being relatively large in diameter (typically larger than 20mm)
Manhole or irregular hole, mainly comprising wall, top surface and bottom surface, the bottom surface of logical window feature is defined as into logical window feature
Seed face；Hole characteristic is the position for needing to drill through using drilling processing on covering, shows as diameter in shape less (generally little
In or be equal to 20mm) manhole, mainly comprising wall, top surface and bottom surface, the bottom surface of hole characteristic is defined as into hole characteristic
Seed face；Contour feature is the theoretical profile border of skin part, is used as the guide line of trimming programming, mainly comprising contoured surface,
Reverse side identified surface is defined as into the seed face of profile.
The basis for selecting of described reverse side identified surface is：It is front to define skin part face to be processed, the face of vis-a-vis
For reverse side, any one face in covering reverse side is chosen as reverse side identified surface.
The described seed face for searching for each category feature based on ring property figure and holographic attribute face edge graph is referred to based on ring property
Figure and holographic attribute face edge graph, while the ring property and topological connection relation in the face of analysis, expand out and meet all kinds of feature seed faces
Seed face of the face of ring property and topological connection relation feature as each category feature.Ring property figure refers to had by analysis face
Ring property, construct ring property figure, ring property is referred mainly to whether there is inner ring, has how many bar several inner ring, each inner ring distinguish
The characteristics such as inner ring side.
It is described whether be connected according to curved surface when process is optimized to broken face first, whether continuous and thickness for curvature
Identical Rule of judgment, searches out and meets the curved surface for requiring, the curved surface for having associated relation is considered as broken face, process is optimized,
And form complete feature to replace original broken region feature, it is ensured that the accuracy of undercut nature identification.
All of front is found according to reverse side identified surface first when described undercut nature builds, seed face is opened up according to sinking
Exhibition rule traversal front is correctly sunk seed face, and rule is expanded in seed face of sinking：During front of the definition containing inner ring is
Between aspect, by comprise only outer annular edge front and and expand as bottom surface of sinking with the disjunct face of intermediate surface, according to sagging
Correct base angle face is found in seed face, recycles base angle face of sinking to find correctly sagging top surface.The undercut nature of required extraction
Information mainly includes：Sagging numbering, thickness, bottom surface, base angle face and top surface.
Described logical window and hole characteristic find all of reverse side according to reverse side identified surface when building first, by traveling through reverse side
The curved surface with inner ring side is obtained as logical window feature and the seed face of hole characteristic.Wherein, the reverse side by inner ring side quantity more than 2
Or inner ring side quantity is equal to 2 and the reverse side expansion with diameter greater than 20mm is logical window seed face；Inner ring side quantity is equal to into 2 and diameter
Reverse side less than or equal to 20mm is expanded as hole seed face.Correct wall is found further according to seed face, is found further according to wall
Correct top surface.The logical window characteristic information of required extraction mainly includes：The numbering of logical window, logical window depth, bottom surface, wall and top
Face；The hole characteristic information of required extraction mainly includes：The numbering in hole, bottom surface, wall, top surface, bore dia, hole depth, hole site,
The axial of hole, accuracy class, tolerance.
Described contour feature finds all of reverse side according to profile seed face when building first, searches again for adjacent with reverse side
All of face, obtain all of side, then the wall of hole and logical window removed from side, that is, obtained all of contoured surface.
The contour feature information of required extraction mainly includes：Profile numbering, contoured surface, accuracy class.
Beneficial effects of the present invention：
The present invention can cover the characteristic type of aircraft skin part Milling Process, and recognition efficiency is high, and accuracy is high, to carry
High covering process automation level is laid a good foundation, and provides effective hand for the data transfer between CAD/CAPP/CAM systems
Section.
Description of the drawings
Fig. 1 is the aircraft skin part feature recognition methods flow chart of the present invention.
Aircraft skin part schematic diagrames of the Fig. 2 for the embodiment of the present invention, wherein 1 is sagging, 2 are logical window, and 3 is hole, and 4 are wheel
It is wide.Skin part is mainly by these structure compositions.
Fig. 3 is that undercut nature defines schematic diagram, and wherein C is bottom surface of sinking, and D is base angle face of sinking, and E is the top surface that sink, often
Individual sinking is made up of a bottom surface, several base angle faces and a top surface.
Fig. 4 is logical window characterizing definition schematic diagram, and wherein F is logical window bottom surface, and G is logical window wall, and H is logical window top surface, Wedge
To lead to window top face profiles profile side, each logical window is by a bottom surface, several walls, a top surface and some profile side structures
Into.
Fig. 5 is that hole characteristic defines schematic diagram, and wherein I is bottom hole face, and J is wall surface of the hole, and K is hole top surface, each Kong Youyi
Bottom surface, several walls and a top surface are constituted.
Fig. 6 is the ring property figure in a face, wherein L1And L2Two rings being had by the face, L1There are 8 inner ring sides, L2
There are 2 inner ring sides.
Fig. 7 be undercut nature partial holography attribute face edge graph, wherein f1For bottom surface of sinking, and with side e1、e2、e3、e4、e5、
e6、e7、e8It is connected with 8 base angles face, for example side e1、e2Respectively with base angle face f2、f3It is connected, face f2、f3With side e9Connected, base angle
Face f3With sagging top surface f4With side e10It is connected.
Fig. 8 is the unique mark schematic diagram of undercut nature topology element, each element type is identified using tag values.
Fig. 9 is the sagging schematic diagram in broken face.
Figure 10 is undercut nature identification process figure.
Figure 11 is logical window feature recognition flow chart.
Figure 12 is hole characteristic identification process figure.
Figure 13 is aircraft skin part feature recognition result schematic diagram, and wherein feature recognition result can be stored in XML format
In file.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in figures 1-13.
Flow chart is as shown in Figure 1.Comprise the following steps that：
1st, analysis of aircraft skin part architectural characteristic and processing characteristic, define undercut nature, logical window feature, hole characteristic and wheel
Wide feature.
There is substantial amounts of sagging, logical window and hole in aircraft skin part (hereinafter referred to as covering) structure, as shown in Fig. 2 logical
Cross to its architectural characteristic and representative process method analysis, covering machining feature is summarized as：Undercut nature, logical window feature, Kong Te
Seek peace contour feature.
1) undercut nature (Subsidence)：Sink the shallow slot referred on covering, as shown in figure 3, each sink the bottom of by
Face, base angle face and top surface are constituted, wherein the bottom surface sinking, as shown in C in Fig. 3, in the face such as Fig. 3 of base angle shown in D, top surface such as Fig. 3
Shown in middle E.
With reference to the sagging geometry characteristic of covering and exemplary process, undercut nature (S) is defined as：
S=SGeo∪SAttr
SGeo=Stop∪Sbase∪Sbottom
SGeoRepresent the geological information of undercut nature, wherein Stop、Sbase、SbottomTop surface, the bottom of undercut nature are represented respectively
Edged surface, bottom surface；SAttrRepresent the non-geometric parameter information of undercut nature, including sagging numbering, sagging type and sagging bottom surface
Design thickness.
2) lead to window feature (Window)：Logical window refer to the irregular hole for needing milling to wear on skin part or with diameter greater than
The circular hole of 20mm, as shown in figure 4, each logical window is made up of wall, top surface, bottom surface and top surface profile side, wherein the bottom surface of logical window,
As shown in F in Fig. 4, in wall such as Fig. 4 shown in G, in top surface such as Fig. 4 shown in H, W in top surface profile side such as Fig. 4edgeIt is shown.
With reference to the logical window geometry characteristic of covering and exemplary process, logical window feature (W) is defined as：
W=WGeo∪WAttr
WGeo=Wside∪Wtop∪Wbottom∪Wtopedge
WGeoRepresent the geological information of logical window feature, wherein Wside、Wtop、Wbottom、WtopedgeLogical window feature is represented respectively
Wall, top surface, bottom surface, top surface profile side；WAttrThe non-geometric parameter information of logical window feature is represented, including logical window is numbered and leads to window
Depth.
3) hole characteristic (Hole)：Hole refers to need the diameter for drilling through to lead to less than or equal to the circle of 20mm on skin part
Hole, as shown in figure 5, each hole is made up of wall, top surface, bottom surface, the bottom surface of its mesopore, as shown in I in Fig. 5, in wall such as Fig. 5
Shown in J, in top surface such as Fig. 5 shown in J.
With reference to covering bore geometry characteristic and exemplary process, hole characteristic (H) is defined as：
H=HGeo∪HAttr
HGeo=Hside∪Htop∪Hbottom
HGeoRepresent the geological information of hole characteristic, wherein Hside、Htop、HbottomRepresent respectively the wall of hole characteristic, top surface,
Bottom surface；HAttrRepresent hole characteristic non-geometric parameter information, including hole numbering, bore dia, hole depth, hole site, hole it is axial,
Accuracy class, tolerance.
4) contour feature (Profile)：Profile refers to the theoretical profile border of skin part, is used as the guiding of trimming programming
Line.One skin part only one of which contour feature, as indicated with 4 in fig. 2, is made up of all of contoured surface of skin shape.
With reference to covering profile geometry characteristic and exemplary process, contour feature (P) is defined as：
P=PGeo∪PAttr
PGeo=Pprofile
PGeoRepresent the geological information of contour feature, wherein PprofileThe wall of expression contour feature, top surface, bottom surface；PAttr
Represent the non-geometric parameter information of contour feature, including profile numbering, the accuracy class of contoured surface.
2nd, ring property figure and holographic attribute face edge graph are pre-seted and are built to skin part
1) part model is pre-seted, sets up Cutter coordinate system, selectes reverse side identified surface and part model input
Definition.The basis for selecting of wherein reverse side identified surface is：It is front to define skin part face to be processed, and the face of vis-a-vis is anti-
Face, chooses any one face in covering reverse side.
2) all point, line, surface topology elements of CAD model are obtained, is renamed according to the mode of topological classification+identification code
Topology element, as shown in figure 8, giving each topology element specific identification code, makes topology element have uniqueness, is easy to follow-up
Feature recognition and feature recognition result preserve.
3) build the ring property figure of skin model.
Ring property figure is to construct ring property figure by the ring property that analysis face has, and ring property refers mainly to whether there is herein
Inner ring, there are several inner ring, each inner ring to distinguish the characteristics such as how many bar inner ring side, its content includes：
The information in face：The unique mark in face, the inner ring edge strip number for whetheing there is inner ring, inner ring number, each inner ring, such as 1 institute of table
Show.
Table 1
As shown in fig. 6, utilize ring property figure, inner ring contained by a face and interior contained by each inner ring can be clearly given expression to
Ring side.
4) build the holographic attribute face edge graph of skin model.
Holographic attributed graph adds the information on more sides used for feature recognition and face on the basis of the edge graph of attribute face
Information, its content includes：
The information on side：While unique mark, while belong to inner ring or outer ring mark, adjacent surface angle, corner degree, edge lengths,
As shown in table 2；
Table 2
The information in face：The unique mark in face, curved surface or plane mark, the quantity of intersection, the area in face, the inner and outer ring in face
Number, as shown in table 3.
Table 3
The topology information and each yuan of all geometric elements required for feature recognition are represented using holographic attribute face edge graph
Annexation between element, as shown in fig. 7, by introducing corner degree, face angle degree can clearly express the connection between face and face
Relation, wherein corner degree can represent the conversion relations of two adjacent surfaces, and face angle degree can represent the position relationship of two adjacent surfaces.
3rd, faceted search is carried out based on reverse side identified surface, seed face and expansion rule, builds machining feature
1) machining feature seed face definition：Bottom surface of the seed face of undercut nature for undercut nature, as shown in C in Fig. 3；It is fixed
The seed face of the logical window feature of justice is the bottom surface of logical window feature, as shown in F in Fig. 4；The seed face for defining hole characteristic is hole characteristic
Bottom surface, as shown in I in Fig. 5.
2) selected based on reverse side identified surface and the definition of seed face, travel through the holographic attribute face edge graph of skin model, planted
Sub- face matching, it is specific as follows：
(1) all faces of skin model are obtained and is stored in face row BodyFaces, ergodic surface row BodyFaces, identified according to reverse side
Face extracts all covering reverse side, is stored in face row BackFaces, further ergodic surface row BackFaces, searches for adjacent with reverse side
Face, that is, obtain all sides, be stored in face row SideFaces, remove reverse side and the remaining face in side is front, be stored in face row
FrontFaces, ergodic surface row FrontFaces, front of the definition containing inner ring are intermediate surface, are stored in face row
MidLayerFaces, then all reverse side are traveled through, the reverse side that there is inner ring is stored in face row FF。
(2) travel through all fronts, only the front of outer shroud and with the disjunct face of intermediate surface, then be stored in face row LSseed,
Traversal of lists LSseed, search out all broken faces in list, and broken face is matched to merge respectively again form seed face and deposit
In list SseedIn, concrete grammar is as follows：In list LSseedIn arbitrarily take out a face S1 and search for the face being adjacent, then divide
Not Ji Suan two faces corner degree and face angle degree, degree A1 in corner is in two intersections and respectively draws straight line and meet at intersection
Upper same point, the angle of two straight lines of gained.Face angle degree F1 is the angle of two intersection Central Point Method vectors, if corner
Degree meets condition：0 ° or A1 ≈ 180 ° of A1 ≈, face angle degree meets condition：0 ° or F1 ≈ 180 ° of F1 ≈, then search for and adjacent surface phase
Adjacent face, if being unsatisfactory for condition continues to search, until search is less than till meeting the face for requiring, the face of search is stored in
In list L1, judge the number in face in L1, if number is equal to 1, S1 is stored in into SseedIn, if number is more than 1, will
Face in list L1 merges, then the face of merging is stored in SseedIn.By the face in list L1 in list LSseedMiddle removing,
And list L1 is emptied, then repeatedly aforesaid operations, final to obtain seed face list Sseed。
(3) travel through FFAll faces, obtain all inner ring, be stored in side row Ein, while row number be more than 2 or while row number etc.
Row W when the circle diameter constituted in 2 and in row is then stored in more than 20mmin, while row number be equal to 2 and while arrange composition circle diameter
Side row H is stored in then less than or equal to 20mmin, side row WinThe face at place is stored in Wseed, side row HinThe face at place is stored in Hseed, i.e.,
WseedFor logical window feature seed face row, i.e. HseedArrange for hole characteristic seed face.
4) the sagging seed face S to obtainseedIt is extended, builds complete undercut nature, particular flow sheet such as Figure 10 institutes
Show.
(1) take out SseedFirst face, newly defines a undercut nature, travels through front face row FrontFaces, search with
The face that seed face is connected, base angle face of as sinking, as shown in D in Fig. 3.
(2) front FrontFaces is traveled through, searches for the face being connected with base angle face, that is, obtain the top surface that sink, such as E institutes in Fig. 3
Show.One complete undercut nature is constituted by bottom surface, base angle face, top surface, undercut nature list is stored in
SubsidenceList。
(3) take out SseedSecond face, circulation step (1) (2), the rest may be inferred, takes out Sseed3rd face ... is until taking
Go out SseedLast face, circulation step (1) (2), obtains the preliminary recognition result of undercut nature.
5) the logical window seed face W to obtainseedIt is extended, builds completely logical window feature, particular flow sheet such as Figure 11 institutes
Show.
(1) take out WseedFirst face, newly defines a logical window feature, travels through all face BodyFaces, search and seed
The face that face is connected, as leads to window wall, as shown in G in Fig. 5.
(2) front FrontFaces is traveled through, searches for the face being connected with wall, as led to window top surface, as shown in H in Fig. 4, take
Go out the appearance profile side of top surface, W in such as Fig. 4edgeIt is shown.By bottom surface, wall, top surface, top surface profile side constitute one it is complete
Whole logical window feature, is stored in logical window feature list WindowList.
(3) take out WseedSecond face, circulation step (1) (2), the rest may be inferred, takes out Wseed3rd face ... is until taking
Go out WseedLast face, circulation step (1) (2), the identification of logical window feature complete.
6) the hole seed face H to obtainseedIt is extended, builds complete hole characteristic, particular flow sheet is as shown in figure 12.
(1) take out HseedFirst face, newly defines a hole characteristic, travels through all face BodyFaces, search and seed face
Connected face, as wall surface of the hole, as shown in J in Fig. 5.
(2) front FrontFaces, the face that search is connected with wall, as hole top surface, as shown in K in Fig. 5 are traveled through.The bottom of by
Face, wall, top surface constitute a complete hole characteristic, are stored in hole characteristic list HoleList.
(3) take out HseedSecond face, circulation step (1) (2), the rest may be inferred, takes out Hseed3rd face ... is until taking
Go out HseedLast face, circulation step (1) (2), the identification of hole characteristic complete.
7) a skin part only one of which contour feature, the wall of all holes and logical window from all sides
Reject in SideFaces, remaining face is all contoured surfaces of contour feature.
4th, extraction process undercut nature, undercut nature, logical window feature, hole characteristic and contour feature information, obtain feature knowledge
Other result, recognition result can be stored in XML file, and partial recognition result sectional drawing is as shown in figure 13.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (7)
1. a kind of aircraft skin part feature recognition methods, it is characterised in that it comprises the following steps：
First, analysis of aircraft stressed-skin construction feature and processing characteristics define all kinds of covering machining features；
Second, ring property figure and holographic attribute face edge graph are pre-seted and are built to aircraft skin part, are pre-seted main bag
Include：Set up Cutter coordinate system, select reverse side identified surface and part model input；Define the seed of all kinds of covering machining features
Face, searches for the seed face of each category feature based on ring property figure and holographic attribute face edge graph；
3rd, process is optimized to the seed face with broken face, is then based on reverse side identified surface, seed face and expands rule entering
Line search, searches out all geometric elements of each category feature, constructs covering machining feature；
4th, all kinds of characteristic informations are extracted, feature recognition result is obtained；
The described seed face that each category feature is searched for based on ring property figure and holographic attribute face edge graph refer to based on ring property figure and
Holographic attribute face edge graph, while the ring property and topological connection relation in the face of analysis, expand out and meet all kinds of feature seed face rings spies
Seed face of the face of property and topological connection relation feature as each category feature；Ring property figure refers to the ring having by analysis face
Characteristic, constructs ring property figure, and ring property is referred mainly to whether there is inner ring, has how many bar inner ring several inner ring, each inner ring distinguish
Side characteristic.
2. method according to claim 1, is characterized in that by analysis of aircraft skin part design feature and processing characteristics,
Geometrical body with process similarity and geological information is defined as into covering machining feature, it is defined herein to sink, lead to window, hole and wheel
Wide feature；Undercut nature is the shallow slot on covering, mainly comprising top surface, base angle face and bottom surface, the bottom surface of undercut nature is defined
For the seed face of undercut nature；Logical window is characterized in that on covering the position for needing to mill through using Milling Process, shows as in shape straight
Manhole or irregular hole of the footpath more than 20mm, mainly comprising wall, top surface and bottom surface, the bottom surface of logical window feature are defined
To lead to the seed face of window feature；Hole characteristic is the position for needing to drill through using drilling processing on covering, shows as diameter in shape
Less than or equal to the manhole of 20mm, mainly comprising wall, top surface and bottom surface, the bottom surface of hole characteristic is defined as into hole characteristic
Seed face；Contour feature is the theoretical profile border of skin part, is used as the guide line of trimming programming, mainly comprising contoured surface,
Reverse side identified surface is defined as into the seed face of profile.
3. method according to claim 1, is characterized in that the basis for selecting of described reverse side identified surface is：Define covering zero
Part face to be processed is front, and the face of vis-a-vis is reverse side, chooses any one face in covering reverse side as reverse side identified surface.
4. method according to claim 1, is characterized in that described when being optimized process to the seed face with broken face
Whether it is connected according to curved surface first, whether curvature continuously searches out the curved surface for meeting requirement, meets this annexation by having
Curved surface is considered as broken face, is optimized process, and forms complete feature to replace original broken region feature, it is ensured that undercut nature is known
Other accuracy.
5. method according to claim 2, first according to reverse side identified surface when it is characterized in that described undercut nature builds
Find all of front, rule traversal front is expanded according to seed face of sinking and correctly sunk seed face, seed face of sinking
Expand rule：Front of the definition containing inner ring is intermediate surface, will comprise only the front of outer annular edge and is not attached to intermediate surface
Face expand as bottom surface of sinking, correct base angle face is found according to sagging seed face, recycles base angle face of sinking to find correctly
Sagging top surface；The undercut nature information of required extraction mainly includes：Sagging numbering, thickness, bottom surface, base angle face and top surface.
6. method according to claim 2, first according to reverse side mark when it is characterized in that described logical window and hole characteristic build
All of reverse side is found in knowledge face, obtains the curved surface with inner ring side as logical window feature and the seed of hole characteristic by traveling through reverse side
Face；Wherein, by inner ring, when quantity is more than 2 reverse side or inner ring, quantity is equal to 2 and the reverse side expansion with diameter greater than 20mm is logical
Window seed face；Inner ring side quantity is equal to into 2 and diameter is hole seed face less than or equal to the reverse side expansion of 20mm；Further according to seed
Correct wall is found in face, finds correct top surface further according to wall；The logical window characteristic information of required extraction mainly includes：Logical window
Numbering, logical window depth, bottom surface, wall and top surface；The hole characteristic information of required extraction mainly includes：The numbering in hole, bottom surface, wall
Face, top surface, bore dia, hole depth, hole site, the axial of hole, accuracy class and tolerance.
7. method according to claim 2, first according to profile seed face when it is characterized in that described contour feature builds
All of reverse side is found, all of face adjacent with reverse side is searched again for, is obtained all of side, then hole is removed from side and is led to
The wall of window, that is, obtained all of contoured surface；The contour feature information of required extraction mainly includes：Profile numbering, contoured surface
And accuracy class.
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| CN106652034B (en) * | 2016-09-23 | 2020-04-28 | 江西洪都航空工业集团有限责任公司 | Modeling method for quickly generating guide hole on skin part |
| CN109145753B (en) * | 2018-07-23 | 2020-10-02 | 珠海格力电器股份有限公司 | Watch hand identification method and device |
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