CN103336485A - Rapid generating method of milling path of web of airplane structural member - Google Patents
Rapid generating method of milling path of web of airplane structural member Download PDFInfo
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Abstract
A rapid generating method of the milling path of a web of an airplane structural member belongs to the technical field of CAM. The rapid generating method comprises the following steps: at first, clicking a web surface on which a tool path needs to be generated in a part model through a mouse in a CAM system, automatically constructing a milling area of the web of the clicked web surface, then selecting processing technology information of the clicked web surface automatically generated or manually inputted according to data in a process database, and achieving the rapid and automatic generation of the processing area and the processing path. The method is high in computing efficiency and strong in flexibility, reduces the programming workload of engineers, meanwhile, supports the batch processing to a single web surface and a plurality of web surfaces, and can meet different requirements of engineers.
Description
Technical field
The present invention relates to a kind of numerical-control processing method, especially a kind of automatic generation method of Milling Process track, specifically a kind of aircraft structure web Milling Process track generates method fast.
Background technology
As everyone knows, aircraft structure is the main load-carrying member of aircraft, comprises structure types such as frame, beam, wallboard, because the aircraft structure crudy requires height, the process-cycle is short, mainly in the enterprising line number control processing of high-grade, digitally controlled machine tools.China's Aviation Manufacturing Enterprises is passed through technological transformation for many years, introduce and developed numerically-controlled machine and the support equipment of a large amount of high values, high use cost, but the overall utilization factor less than 40% of equipment, its one of the main reasons is exactly that the efficient of numerical control programming is low, for the large-scale integral structural member, the ratio of its programming time and machine tooling time has reached 7:1, has caused the long-time waste of lathe ability.
At present aircraft structure digital control processing programing work mainly carries out at some commercialization CAM platforms, as the CATIA of French Da Suo company, the UG NX of Siemens, the Pro/E of PTC etc.When using these softwares to carry out the establishment of job sequence, need manually click a large amount of geometric element structure machining areas, a large amount of machined parameters manually are set, the workload of programming is very big, especially to have size big for aircraft structure, the characteristics that work flow is many, this programming mode is elapsed time very; In addition, for reducing the take-off weight of aircraft, under the prerequisite that guarantees design of part intensity, aircraft structure adopts equal strength design usually, has therefore formed the large amount of complex machining area in part, as dark narrow groove, close chamfered groove etc., the machining area of these structures can't directly obtain from part, need manually to calculate and to create assisted geometric and make up machining area, difficulty height, workload are big, also are one of major reasons that influences the aircraft structure numerical control programming; Moreover when manually programming, because human negligence, human factor such as lack experience make the programming quality of stability relatively poor, the later stage needs carry out program optimization in conjunction with simulation work in a large number, and the standardization deficiency that causes programming, and influences accumulation of knowledge.
Another programming mode is based on the automatic numerical control programming mode of feature at present, this method is by identifying the characteristic information in the part automatically, automatically construct machining area and choose parameter, realize the automatic generation of job sequence, but this technology is not used widely at present.At first, feature identification technique is difficult to cover the automatic identification of all part features, especially this baroque part of aircraft structure, often the situation of imperfect and identification error can't be identified, be identified to appearance, because the low quality of programming that caused of the quality of recognition result is low, later stage still needs to carry out a large amount of manual repairs to be done, and the overall lifting degree of programming efficiency is not high.Secondly, emphasize integrated automation based on the automatic numerical control programming of feature, do not have artificial the intervention in the process, often be difficult to embody the rational subjective demand of engineering staff, so dirigibility is relatively poor.
Summary of the invention
The objective of the invention is to adapt to complex structural member programming needs at existing C AM software, cause the programming time long, and existing web machining prgraming based on feature exist the identification difficulty big, need manual intervention to repair to cause the not high problem of programming efficiency, invent a kind of counting yield height, dirigibility is strong and can support the aircraft structure web Milling Process track of single web and a plurality of web batch processing to generate method fast simultaneously.
Technical scheme of the present invention is:
A kind of aircraft structure web Milling Process track generates method fast, it is characterized in that it may further comprise the steps:
(1) under the CAM environment, click web face to be processed by mouse, obtain web face row;
(2) be the seed face with selected web face, make up web Milling Process zone automatically;
(3) according to the data in the technological data bank, adopt automatically and the method that manually combines, carry out the processing technology decision-making, obtain the processing technology scheme of selected web;
(4) web machining area and processing scheme are invested process operation corresponding among the CAM automatically, generate cutter path fast.
The web face that described web face to be processed is clicked in the model by mouse obtains, it supports choosing of single web face and a plurality of web faces simultaneously, the web face choose position and the properties affect that is not subjected to web, freely determined according to actual needs by operating personnel.
Described automatic structure web Milling Process zone may further comprise the steps:
1) extracts respectively that selected web face is the seed face in the web face row, its outline and interior profile are extracted respectively, interior profile can be sky, deposit among OuterLoop and the InnerLoop, OuterLoop is corresponding to the intersection edges of web face and broad sense side, and InnerLoop is corresponding to web face and the intersection edges of hole (H) and island (I) on it; The broad sense side comprises side, corner face and sagging face;
2) OuterLoop and the InnerLoop with the seed face carries out the joint face expansion, and the face that obtains linking to each other with the web face is listed as, and deposits in face row C respectively
OutAnd C
In, and obtain the wherein connection attribute of each face and seed face;
1. find the face adjacent with the web face according to each limit among OuterLoop and the InnerLoop, the face that these are adjacent is deposited in characteristic face row C
OutAnd C
InIn;
2. obtain C
OutAnd C
InIn each face the corner degree and the face angle that become with the web face, what wherein the corner kilsyth basalt showed is the transition relation of face and face, what the face angle was represented is the position relation of face and face, then to look two adjacent surfaces be recessed connection if the face angle is spent less than 180, otherwise be protruding connection;
3) after obtaining the joint face row of web face, according to bottom web face machining area decision rule or building method, create web Milling Process zone automatically; Web Milling Process zone comprises: web face (B), and web face processing border (Loop), end face (T), its median ventral plate face (B) is clicked by mouse and obtains;
(1) for the web face of profile in not containing, namely InnerLoop is empty web face, and its machining area judgment rule or building method are as follows:
The building method of end face T is as follows:
1. travel through C
OutIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected with the web face, deposit in face row C
TIn;
2. travel through C
TIn all faces, find all face middle distance web face vertical range point P farthest
Top, pass through P
TopConstruct the face parallel with the web face as end face T.
The building method of web face processing border Loop is as follows:
1. extract C
TIn each face, travel through all limits of each face, find the not limit on this face adjacent side, web face, and deposit in E
UpIn;
2. extract C
TIn each face, travel through all limits of each face, find the limit on the web face, and deposit in E
DownIn;
3. travel through E
DownEach limit, each edge web face normal direction is stretched, tensile elongation equals end face to the distance of web face, and stretched face is stored in C
ProfileIn;
4. take out C
ProfileIn all faces, add epiplastron face and end face, make up a bounding box, with E
UpIn the extracting section that is in the bounding box of all limits come out, deposit in E
InsideIn;
5. with E
DownIn all limits and E
InsideIn all limits be projected on the web face, deposit in C respectively
Edge1And C
Edge2In, judge C
Edge1All limits and C
Edge2In all limits whether intersection point is arranged; If there is intersection point to be stored in C
InsectionIn, appoint and get an intersection point,
Begin to extract processing border Loop, method is as follows;
A) judge whether this intersection point has the C of belonging to counterclockwise
Edge2The limit, if then turn to step b), then turn to step c) if not; Counterclockwise pressing web normal direction right-handed helix rule judges;
B) along this C
Edge2The limit travels through, and until to next intersection point, gets back to step a);
C) along this C
Edge1The limit travels through, and until to next intersection point, gets back to step a);
D) travel through go back to initial intersection point place always along aforesaid way, deposit all limits that traveled through in Loop, as shown in Figure 7.
(2) for the web face of profile in containing, owing to be subjected to the influence of inner island or internal holes, its machining area judgment rule or building method are as follows:
The building method of interior profile end face (T) is as follows:
1. travel through C
InIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected with the web face, deposit in face row C
TIn;
2. travel through C
TIn all faces, find all face middle distance web face vertical range point P farthest
Top, pass through P
TopConstruct the face parallel with the web face as end face (T), this end face (T) and the end face (T) that is constructed by outer shroud are before compared, will be apart from the web identity distance from the final end face (T) of a conduct;
Definite method of web processing inner boundary Loop:
1. travel through C
InIn all faces, find and the face angle of the web face faces greater than 180 degree, namely becoming the protruding face that is connected with the web face is the hole sidewall, deposits in face row C
LoopIn;
2. travel through C
InIn all faces, finding with the face angle of web face is the sides, island less than the non-vanishing face of 180 degree and corner degree, deposits in face row C
LoopIn;
2. extract face row C
LoopIn each face, travel through all limits of each face, find the limit on the web face, it is projected on the web face, the limit that projection obtains is deposited among the Loop.
4, method according to claim 1 is characterized in that described step (3) web Milling Process process decision method comprises contents such as cutter decision-making and cutting parameter be definite:
1) cutter decision-making comprises that cutter is long, tool radius, and it determines that method is:
1. extract end face (T) to the distance B of web face (B), the reference value as tool length d chooses satisfies d 〉=D;
2. process border (Loop) mean curvature radius minimum value r as the reference value that tool radius R chooses with web, satisfy r 〉=R;
3. from tool magazine, choose the cutter that satisfies above two each and every one conditions, many cutter is met the demands as if having simultaneously, manually determine which selects cutter by operating personnel;
2) cutting parameter determine comprise cutting-in, cut wide, tool path pattern, the speed of mainshaft and speed of feed; Corresponding definite method is as follows:
1. cutting-in, the decision-making of cutting wide, feeding and the rotating speed tool-information of making a strategic decision out according to part material and previous step extracts from the cutting parameter database automatically;
2. can find corresponding tool path pattern from technological data bank, advance and retreat cutter strategy is with other required machined parameters.
Described web processing mode is chosen corresponding process operation from the CAM system, compose automatically in process operation constituting the geometric element of machining area and the result of process decision, generates the cutter path of web Milling Process.
Beneficial effect of the present invention:
The present invention at first clicks the web face that needs to generate the cutter rail in the part model by mouse in the CAM system, automatically make up selected web facing cut and cut the machining area of processing, then according to the data in the technological data bank, can select to generate or manually import automatically the processing technology information of selected web, realize the fast automatic generation of machining area and machining locus.
The present invention has the counting yield height, dirigibility is strong, has alleviated engineering staff's programing work amount, supports single web and a plurality of web batch processing simultaneously, can satisfy engineering staff's different demands.
Description of drawings
Fig. 1 is that web Milling Process track of the present invention generates method flow diagram fast.
Fig. 2 is the synoptic diagram in web Milling Process of the present invention zone, wherein T is end face, B is the web face of required processing, OuterLoop deposits the web outline, InnerLoop deposits profile in the web, outline refers to the intersection edges of web face and broad sense side (side, corner face and sagging face etc.), and interior profile refers to the web face and the intersection edges of hole (H) and island (I) on it.
Fig. 3 is the structure process flow diagram of characteristic face row during web Milling Process of the present invention zone is determined.
Fig. 4 is the calculating synoptic diagram of corner of the present invention degree and face angle, wherein f
1, f
2Be two adjacent faces, e is intersection edges, p
MidBe the mid point of intersection edges, n among the A
1, n
2Be adjacent surface f
1, f
2At p
MidNormal vector, choose f
1, f
2In arbitrary be reference field, choose f here
1Be reference field, determine the direction n of limit e according to the right-handed helix rule
e, n
1To n
2Angle be designated as θ, if θ〉π, then the corner degree is 2 π-θ, if θ＜π, then the corner degree is θ; N among the B
1, n
2Be adjacent surface f
1, f
2Main normal direction, choose f equally
1Be reference field, determine the direction n of limit e according to the right-handed helix rule
e, n
1To n
2Angle be designated as θ, if θ〉π, then the face angle is 2 π-θ, if θ＜π, then the face angle is θ.
Fig. 5 is outer shroud processing boundary formation line drawing synoptic diagram of the present invention, wherein E
UpBe processing required sidewall sideline of using, border, E
DownIntersection for sidewall and web face.
Fig. 6 is structure bounding box synoptic diagram of the present invention, E
InsideFor being in the required sidewall sideline part of bounding box inside, E
DownIntersection for sidewall and web face.
Fig. 7 is that outer shroud processing of the present invention border makes up synoptic diagram, wherein C
Edge1Be E
InsideProjection line on the web face, C
Edge2Be E
DownProjection line on the web face, C
InsectionBe C
Edge1With C
Edge2The intersection point on each limit, arrow are depicted as the direction on each limit, place.
Fig. 8 is processing of the present invention border synoptic diagram, and wherein Loop is the inner and outer boundary of web Milling Process, and B is web, and T is end face.
Fig. 9 is web process tool of the present invention decision-making, wherein D be end face to the vertical range of web face, R is minimum radius-of-curvature in web processing all limits, border, d is tool length, r is tool radius.
Figure 10 generates design sketch fast for web Milling Process track of the present invention, is example with the web milling of the described groove of the embodiment of the invention, and its center line M is the feed track, and line N is the process tool track, and line O is the withdrawing track, and line P is that interlayer moves the cutter track.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1-10.
A kind of aircraft structure web Milling Process track generates method fast, and its process flow diagram comprises following each step as shown in Figure 1:
At first, under the CAM environment, click web face to be processed by mouse, be the seed face with the web face of choosing, carry out face and expand and to obtain the characteristic face row corresponding with the web face, by corresponding rule the characteristic face row are mated again and construct the automatic structure in realization web Milling Process zone, as shown in Figure 2, determine machined parameters by process decision again; The result who constitutes the geometric element of machining area and process decision the most at last composes in the CAM system in the corresponding process operation automatically, generates the cutter path of web Milling Process.
Concrete implementation step can be divided into following components:
1, the web face chooses.
The web face that web face to be processed is clicked in the model by mouse obtains, and supports choosing of single web face and a plurality of web faces simultaneously, the web face choose position and the properties affect that is not subjected to web, freely determined according to actual needs by operating personnel.
2, web Milling Process zone makes up automatically.
1) extracts respectively that selected web face is the seed face in the web face row, its outline and interior profile (can be sky) are extracted respectively, as shown in Figure 2, deposit among OuterLoop and the InnerLoop, OuterLoop is corresponding to the intersection edges of web face and broad sense side (side, corner face and sagging face etc.), and InnerLoop is corresponding to web face and the intersection edges on hole and island etc. on it;
2) OuterLoop and the InnerLoop with the seed face carries out the joint face expansion, and the face that obtains linking to each other with the web face is listed as, and deposits in face row C respectively
OutAnd C
In, and obtain the wherein connection attribute of each face and seed face;
1. find the face adjacent with the web face according to each limit among OuterLoop and the InnerLoop, flow process as shown in Figure 3, the face that these are adjacent is deposited in characteristic face row C
OutAnd C
InIn;
2. obtain C
OutAnd C
InIn each face the corner degree and the face angle that become with the web face, what wherein the corner kilsyth basalt showed is the transition relation of face and face, what the face angle was represented is the position relation of face and face, corresponding computing method as shown in Figure 4, wherein then looking two adjacent surfaces as if the face angle less than 180 degree is recessed connection, otherwise is protruding connection.
3) after obtaining the joint face row of web face, according to bottom web face machining area decision rule or building method, create web Milling Process zone automatically.Web Milling Process zone comprises: web face B, and web face processing border Loop, end face T, as shown in Figure 2.Its median ventral plate face B is clicked by mouse and obtains.
(1) for the web face of profile in not containing, namely InnerLoop is empty web face, and its machining area judgment rule or building method are as follows:
The building method of end face T is as follows:
1. travel through C
OutIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected with the web face, deposit in face row C
TIn;
2. travel through C
TIn all faces, find all face middle distance web face vertical range point P farthest
Top, pass through P
TopConstruct the face parallel with the web face as end face T.
The building method of web face processing border Loop is as follows:
1. extract C
TIn each face, travel through all limits of each face, find the not limit on this face adjacent side, web face, and deposit in E
UpIn, as shown in Figure 5;
2. extract C
TIn each face, travel through all limits of each face, find the limit on the web face, and deposit in E
DownIn, as shown in Figure 5;
3. travel through E
DownEach limit, each edge web face normal direction is stretched, tensile elongation equals end face to the distance of web face, and stretched face is stored in C
ProfileIn, as shown in Figure 6;
4. take out C
ProfileIn all faces, add epiplastron face and end face, make up a bounding box, with E
UpIn the extracting section that is in the bounding box of all limits come out, deposit in E
InsideIn, as shown in Figure 6;
5. with E
DownIn all limits and E
InsideIn all limits be projected on the web face, deposit in C respectively
Edge1And C
Edge2In, judge C
Edge1All limits and C
Edge2In all limits whether intersection point is arranged; If there is intersection point to be stored in C
InsectionIn, appoint and get an intersection point, begin to extract processing border Loop, as shown in Figure 7, method is as follows:
A) judge this intersection point (judges by web normal direction right-handed helix rule counterclockwise) on the direction whether the C of belonging to is arranged counterclockwise
Edge2The limit, if then turn to step b), then turn to step c) if not;
B) along this C
Edge2The limit travels through, and until to next intersection point, gets back to step a);
C) along this C
Edge1The limit travels through, and until to next intersection point, gets back to step a);
D) travel through go back to initial intersection point place always along aforesaid way, deposit all limits that traveled through in Loop, as shown in Figure 7.
(2) for the web face of profile in containing, owing to be subjected to the influence of inner island or internal holes, its web Milling Process zone construction step is as follows:
The building method of interior profile end face T:
1. travel through C
InIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected with the web face, deposit in face row C
TIn;
2. travel through C
TIn all faces, find all face middle distance web face vertical range point P farthest
Top, pass through P
TopConstruct the face parallel with the web face as end face T, this end face T and the end face T that constructed by outer shroud are before compared, will be apart from a conduct final end face T of web identity distance away from.
The extracting method of web processing inner boundary Loop:
1. travel through C
InIn all faces, find and the face angle of the web face faces greater than 180 degree, namely become the protruding face that is connected (being the hole sidewall) with the web face, deposit in face row C
LoopIn;
2. travel through C
InIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected (being the sides, island) with the web face, deposit in face row C
LoopIn;
2. extract face row C
LoopIn each face, travel through all limits of each face, find the limit on the web face, it is projected on the web face, the limit that projection obtains is deposited among the Loop.
By above step, can realize that mouse clicks the machining area that the web face generates the web milling automatically, as shown in Figure 8.
3, according to the data in the technological data bank, adopt automatically and the method that manually combines, carry out the processing technology decision-making, obtain the processing technology scheme of selected web face.
1) web Milling Process process decision content comprises: the cutter decision-making, cutting parameter is definite etc.
2) cutter decision-making comprises cutter length, tool radius etc., and it determines that method is as follows:
1. extract end face T to the distance B of web face B, the reference value as tool length d chooses satisfies d 〉=D;
2. process border Loop mean curvature radius minimum value r as the reference value that tool radius R chooses with web, satisfy r 〉=R;
3. from tool magazine, choose the cutter that satisfies above two each and every one conditions, many cutter is met the demands as if having simultaneously, manually determine which selects cutter by operating personnel.
3) cutting parameter determine comprise cutting-in, cut wide, tool path pattern, necessary parameter such as the speed of mainshaft and speed of feed.Corresponding definite method is as follows:
1. cutting-in, the decision-making of cutting wide, feeding and the rotating speed tool-information of making a strategic decision out according to part material and previous step extracts from the cutting parameter database automatically;
2. from technological data bank, can find corresponding tool path pattern, other required machined parameters such as advance and retreat cutter strategy.
4, from the CAM system, choose corresponding process operation according to the web processing mode, compose automatically in process operation constituting the geometric element of machining area and the result of process decision, generate the cutter path of web Milling Process.As shown in figure 10.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (5)
1. an aircraft structure web Milling Process track generates method fast, it is characterized in that it may further comprise the steps:
(1) under the CAM environment, click web face to be processed by mouse, obtain web face row;
(2) be the seed face with selected web face, make up web Milling Process zone automatically;
(3) according to the data in the technological data bank, adopt automatically and the method that manually combines, carry out the processing technology decision-making, obtain the processing technology scheme of selected web;
(4) web machining area and processing scheme are invested process operation corresponding among the CAM automatically, generate cutter path fast.
2. method according to claim 1, it is characterized in that the web face that described web face to be processed is clicked in the model by mouse obtains, it supports choosing of single web face and a plurality of web faces simultaneously, the web face choose position and the properties affect that is not subjected to web, freely determined according to actual needs by operating personnel.
3. method according to claim 1 is characterized in that described automatic structure web Milling Process zone may further comprise the steps:
1) extracts respectively that selected web face is the seed face in the web face row, its outline and interior profile are extracted respectively, interior profile can be sky, deposit among OuterLoop and the InnerLoop, OuterLoop is corresponding to the intersection edges of web face and broad sense side, and InnerLoop is corresponding to web face and the intersection edges of hole (H) and island (I) on it; The broad sense side comprises side, corner face and sagging face;
2) OuterLoop and the InnerLoop with the seed face carries out the joint face expansion, and the face that obtains linking to each other with the web face is listed as, and deposits in face row C respectively
OutAnd C
In, and obtain the wherein connection attribute of each face and seed face;
1. find the face adjacent with the web face according to each limit among OuterLoop and the InnerLoop, the face that these are adjacent is deposited in characteristic face row C
OutAnd C
InIn;
2. obtain C
OutAnd C
InIn each face the corner degree and the face angle that become with the web face, what wherein the corner kilsyth basalt showed is the transition relation of face and face, what the face angle was represented is the position relation of face and face, then to look two adjacent surfaces be recessed connection if the face angle is spent less than 180, otherwise be protruding connection;
3) after obtaining the joint face row of web face, according to bottom web face machining area decision rule or building method, create web Milling Process zone automatically; Web Milling Process zone comprises: web face (B), and web face processing border (Loop), end face (T),, its median ventral plate face (B) is clicked by mouse and obtains;
(1) for the web face of profile in not containing, namely InnerLoop is empty web face, and its machining area judgment rule or building method are as follows:
The building method of end face T is as follows:
1. travel through C
OutIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected with the web face, deposit in face row C
TIn;
2. travel through C
TIn all faces, find all face middle distance web face vertical range point P farthest
Top, pass through P
TopConstruct the face parallel with the web face as end face T.
The building method of web face processing border Loop is as follows:
1. extract C
TIn each face, travel through all limits of each face, find the not limit on this face adjacent side, web face, and deposit in E
UpIn;
2. extract C
TIn each face, travel through all limits of each face, find the limit on the web face, and deposit in E
DownIn;
3. travel through E
DownEach limit, each edge web face normal direction is stretched, tensile elongation equals end face to the distance of web face, and stretched face is stored in C
ProfileIn;
4. take out C
ProfileIn all faces, add epiplastron face and end face, make up a bounding box, with E
UpIn the extracting section that is in the bounding box of all limits come out, deposit in E
InsideIn;
5. with E
DownIn all limits and E
InsideIn all limits be projected on the web face, deposit in C respectively
Edge1And C
Edge2In, judge C
Edge1All limits and C
Edge2In all limits whether intersection point is arranged; If there is intersection point to be stored in C
InsectionIn, appoint and get an intersection point,
Begin to extract processing border Loop, method is as follows;
A) judge whether this intersection point has the C of belonging to counterclockwise
Edge2The limit, if then turn to step b), then turn to step c) if not; Counterclockwise pressing web normal direction right-handed helix rule judges;
B) along this C
Edge2The limit travels through, and until to next intersection point, gets back to step a);
C) along this C
Edge1The limit travels through, and until to next intersection point, gets back to step a);
D) travel through go back to initial intersection point place always along aforesaid way, deposit all limits that traveled through in Loop, as shown in Figure 7.
(2) for the web face of profile in containing, owing to be subjected to the influence of inner island or internal holes, its machining area judgment rule or building method are as follows:
The building method of interior profile end face (T) is as follows:
1. travel through C
InIn all faces, find and the face angle of the web face faces less than 180 degree, namely become the recessed face that is connected with the web face, deposit in face row C
TIn;
2. travel through C
TIn all faces, find all face middle distance web face vertical range point P farthest
Top, pass through P
TopConstruct the face parallel with the web face as end face (T), this end face (T) and the end face (T) that is constructed by outer shroud are before compared, will be apart from the web identity distance from the final end face (T) of a conduct;
Definite method of web processing inner boundary Loop:
1. travel through C
InIn all faces, find and the face angle of the web face faces greater than 180 degree, namely becoming the protruding face that is connected with the web face is the hole sidewall, deposits in face row C
LoopIn;
2. travel through C
InIn all faces, finding with the face angle of web face is the sides, island less than the non-vanishing face of 180 degree and corner degree, deposits in face row C
LoopIn;
2. extract face row C
LoopIn each face, travel through all limits of each face, find the limit on the web face, it is projected on the web face, the limit that projection obtains is deposited among the Loop.
4. method according to claim 1 is characterized in that described step (3) web Milling Process process decision method comprises contents such as cutter decision-making and cutting parameter be definite:
1) cutter decision-making comprises that cutter is long, tool radius, and it determines that method is:
1. extract end face (T) to the distance B of web face (B), the reference value as tool length d chooses satisfies d 〉=D;
2. process border (Loop) mean curvature radius minimum value r as the reference value that tool radius R chooses with web, satisfy r 〉=R;
3. from tool magazine, choose the cutter that satisfies above two each and every one conditions, many cutter is met the demands as if having simultaneously, manually determine which selects cutter by operating personnel;
2) cutting parameter determine comprise cutting-in, cut wide, tool path pattern, the speed of mainshaft and speed of feed; Corresponding definite method is as follows:
1. cutting-in, the decision-making of cutting wide, feeding and the rotating speed tool-information of making a strategic decision out according to part material and previous step extracts from the cutting parameter database automatically;
2. can find corresponding tool path pattern from technological data bank, advance and retreat cutter strategy is with other required machined parameters.
5. method according to claim 1, it is characterized in that described web processing mode chooses corresponding process operation from the CAM system, automatically compose in process operation constituting the geometric element of machining area and the result of process decision, generate the cutter path of web Milling Process.
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