CN103472766B - The structural member digital control processing chain generation method that process program and machining cell merge mutually - Google Patents
The structural member digital control processing chain generation method that process program and machining cell merge mutually Download PDFInfo
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Abstract
The present invention relates to a kind of structural member digital control processing chain generation method that process program merges mutually with machining cell, key step is as follows: 1) process program builds; 2) process program and machining cell construct digital control processing chain mutually.The structural member digital control processing chain generation method that this process program and machining cell merge mutually, by setting up the Flight Structures NC Machining machining chain that process program and machining cell merge mutually, the degree of depth expresses technological process, complete digital control processing file automatically to generate, to realize the full automation of NC Programming System.
Description
Technical field
The present invention relates to a kind of structural member digital control processing chain generation method that process program merges mutually with machining cell, in the quick NC Programming System of aircraft complex structural member, for expressing the machining cell structure results model in automated programming process, map by being formed with CAM software processing structure tree, directly generate digital control processing file in instantiation mode, belong to aircraft digital advanced manufacturing technology field.
Background technology
Along with the development of Technology of NC Programming, CAM(computer-aided manufacturing) system has extremely strong complicated numerical control programming processing power, but the experience of the simple technologist of dependence adopts interactive mode to generate digital control processing file can not meet actual needs.Therefore, require that system can set up corresponding model, the degree of depth expresses technological process, completes digital control processing file and automatically generates, to realize the full automation of NC Programming System.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of structural member digital control processing chain generation method that process program merges mutually with machining cell, by setting up the Flight Structures NC Machining machining chain that process program and machining cell merge mutually, the degree of depth expresses technological process, complete digital control processing file automatically to generate, to realize the full automation of NC Programming System.
For overcoming the above problems, concrete technical scheme of the present invention is as follows: a kind of structural member digital control processing chain generation method that process program and machining cell merge mutually, and key step is as follows:
1) process program builds;
2) process program and machining cell construct digital control processing chain mutually;
Wherein said process program builds, and comprises two basic technologies: (1) process program model; (2) process program builds rule;
Wherein, process program model adopts tree structure to represent, comprise part, lathe, station, operation, work step, program and cutter seven grades of nodes, these seven grades of nodes are set membership successively; Based on this tree structure model, in conjunction with the typical process flow of aircraft structure, each class aircraft structure is set up process program template; On this basis, process program also must meet certain structure rule, and specific rules is as follows:
(1) priority is at each processing stations, and the design sequence of each work step must meet:
or
wherein
represent " having precedence over ";
(2) existence is for ensureing that process program meets technological requirement, and in process program, some work step must exist, and some work step can not exist, and wherein " 1 " represents to exist, and " 0 " represents not exist, and " 0 or 1 " represents to exist and do not exist;
(3) often cutter all must can be participated in actual cut in validity technological process and remove a certain amount of excess stock, to ensure that process program is effective, rule is as follows: set WP as a certain operation, WS
1, WS
2..., WS
nfor the work step sequence of WP, CT
1, CT
2..., CT
nfor WS
1, WS
2..., WS
ntool sequence, d
1, d
2..., d
n, m
r1, m
r2..., m
rnand m
a1, m
a2..., m
anbe respectively and CT
1, CT
2..., CT
ncorresponding diameter sequence, side direction surplus and axial surplus sequence, MP is the technology characteristics type of the required processing of operation WP, as infructescence WS
1, WS
2..., WS
nthe middle sub-work step sequence WS that there is processing MP
(1), WS
(2)..., WS
(k), and WS
(1), WS
(2)..., WS
(k)corresponding tool diameter and process redundancy sequence are respectively d
(1), d
(2)..., d
(k), m
(r1), m
(r2)..., m
(rk)and m
(a1), m
(a2)..., m
(ak), 1≤k≤n, then must meet: d
(1)>=d
(2)>=...>=d
(k), m
(r1)>=m
(r2)>=...>=m
(rk)and m
(a1)>=m
(a2)>=...>=m
(ak);
Wherein WS
rrepresent profile in roughing, namely under the prerequisite retaining allowance for finish and revise distortion institute made allowance, remove most of process redundancy;
WS
wrepresent finishing web, put in place by the processing of broad sense web;
WS
crepresent corner processing, namely remove the surplus of rotation angle position;
WS
ssrepresent profile in semi-finishing, namely remove the part process redundancy in upright side walls face again, discharge distortion further;
WS
sfrepresent outer rim in half finish-milling, namely remove the part process redundancy of inside and outside edge strip curved surface, discharge distortion further:
WS
fsrepresent profile in finishing, the upright side walls face by part is machined to design size;
WS
ffrepresent outer rim in finish-milling, namely, outer rim Machining of Curved Surface is to design size;
WS
trepresent and cut off processing, cut off from workpiece by part.
Described process program and machining cell construct digital control processing chain mutually, comprise the following steps:
1) process domain structure tree to build: adopt layering to ask friendship characteristic recognition method, build expansion slot descriptor tree shaped model and processing territory tree structure model, complete the identification of aircraft structure feature, wherein:
1.1) slot descriptor related description is as follows: complex-shaped surface mould is made up of profile, island, constraint end face and constraint bottom surface, and profile and island are formed by connecting according to certain sequence by multiple sidewall dough sheet, and there is the constraint end face of self and constraint bottom surface, this structure is claimed to be broad sense sidewall, be expressed as s, be divided into wheel profile and island-shaped, be expressed as s
p, s
i; On certain station direction, using profile and island as broad sense sidewall, and with constraint end face, retrain remote definition vallecular cavity feature together with bottom surface, and subsidiary characteristic is defined on broad sense sidewall, as caved in, muscle, corner, opening and closing angle etc., namely form expansion slot descriptor, be expressed as g, its BNF normal form is defined as follows:
< expands slot descriptor >::=(< station direction >, < identifies >, < retrains end face _ 1>, < retrains bottom surface _ 1>, { bottom surface }, < broad sense sidewall >, { broad sense sidewall }, [father's groove], { pilot trench })
< identifies >::=(< groove >|< opening >|< hole >)
< broad sense sidewall >::=(< side collection >, < type >, < retrain end face _ 2>, < retrains bottom surface _ 2>, { muscle }, { angle of release }, { closing angle }, { caving in }, { bottom roundings }, { corner }, { chamfering }, [frock] ...)
< type >::=(< profile >|< island >)
Wherein, expansion slot descriptor and each broad sense sidewall all have respective constraint end face and constraint bottom surface, might not be equal between them, and in addition, for ease of the finishing of sidewall node, a broad sense sidewall may belong to multiple expansion slot descriptor; Yi Zhi, expansion slot descriptor meets following character:
Character 1 on a certain station direction, if there is broad sense sidewall s, its side collection F={f
1, f
2..., f
n, constraint end face is p
t, constraint bottom surface is p
b, n>=2, so, by side f
1, f
2..., f
nand p
t, p
ba complete totally enclosed three-dimensional communication space must be formed;
Character 2, on a certain station direction, expands slot descriptor g if existed, by wheel profile broad sense sidewall s
pand several island-shaped broad sense sidewalls s
i1, s
i2..., s
in, constraint end face p
tand constraint bottom surface p
bformed, so, s
p, s
i1, s
i2..., s
inand p
t, p
ba complete totally enclosed three-dimensional communication space must be formed;
1.2) domain structure tree related description is processed as follows: do as one likes matter 2 known expansion slot descriptor defines a closed three-dimensional communication space, this space is the excess stock territory that this cavity feature of formation need be removed, therefore, the processing territory of available expansion slot descriptor tree shaped model definition and expression part, result is called the processing territory tree structure model of part, the root node of processing territory tree structure model is work territory σ, the child node of σ is station direction, exist under each station several separate and exist set membership territory unit a; The three dimensional closure material area that territory unit is the constraint end face of expansion slot descriptor, constraint bottom surface, the side collection of wheel profile broad sense sidewall and island-shaped broad sense sidewall side collection surround, its BNF normal form can be expressed as: < territory unit >::=(< outline side collection >, { side, island collection }, < retrains end face >, < retrains bottom surface >, [father field unit], { subdomain unit })
2) cutter mates with territory unit: the technological process described according to process program, extract process redundancy and the tool-information of each work step, based on the geometric attribute of processing territory unit, comprise height, minimum widith, side fillet value and bottom surface fillet value, choose the machinable slot descriptor feature of cutter;
3) machining cell builds: according to cutter can working ability, namely giving under definition cavity feature, tool geometrical parameter, side direction surplus and axial surplus condition, technical office's cutter can machining area, having can the different geometric configuration of machining area again, choose different process operations, and the geometric parameter of calculating processing operation; Have and machining area, process operation type, process operation geometric parameter, machined parameters and tool geometrical parameter can form machining cell, in Flight Structures NC Machining programming, the most frequently used process operation is that pocket machining operation operates two kinds with contour machining; Wherein
The geometric parameter BNF of pocket machining operation is expressed as follows:
Geometric parameter: :=(< retrains end face >, < retrains bottom surface >, < profile leads first >, { unit is led on island }, < axial surplus >, < radial slack >); Wherein, profile leads unit and island are led unit and are closed-loop, and island are led first number and are more than or equal to 0, in addition, easily knows that above-mentioned geometric element defines a closed vallecular cavity, can complete the calculating of slot machining cutter rail in conjunction with cutter, policing parameter etc.;
The geometric parameter BNF of contour machining operation is expressed as follows:
Geometric parameter: :=(< retrains end face >, < retrains bottom surface >, < profile leads first >, [initial constraint unit], [stopping constraint unit], < axial surplus >, < radial slack >); Wherein, it is the most important geometric element of contour machining that profile leads unit, both can be closed-loop, and also can be open loop, and initial constraint unit and termination constraint unit are for retraining the initial sum final position of cutter in process;
4) process program and machining cell merge: obtain often machinable for cutter machining cell sequence by step 3), under adding these machining cell sequences the cutter pitch of process program to, form the tree structure of 8 grades of nodes, this tree structure is the digital control processing chain of aircraft structure, expresses the technological process of part in microcosmic point; Digital control processing chain and CATIA process tree-model and there are mapping relations, under the cutter pitch of correspondence, machining cell between them and process operation map one by one, by by the process operation optimum configurations of machining cell in the process operation of instantiation, robotization can generate digital control processing file.
The structural member digital control processing chain generation method that this process program and machining cell merge mutually, this model is in the quick NC Programming System of aircraft complex structural member, for expressing the machining cell structure results model in automated programming process, mapping by being formed with CAM software processing structure tree, directly generating digital control processing file in instantiation mode.
Accompanying drawing explanation
Fig. 1 is that process program tree structure represents model schematic.
Fig. 2 is slot descriptor schematic diagram.
Fig. 3 is processing territory tree structure model schematic.
Fig. 4 a is work territory meaning figure.
Fig. 4 b is the schematic diagram of territory unit.
Fig. 5 a is pocket machining operation geometric parameter schematic diagram.
Fig. 5 b is contour machining operation geometric parameter schematic diagram.
Fig. 6 is machining cell case decomposition schematic diagram.
Fig. 7 a is digital control processing chain model schematic diagram.
Fig. 7 b is that CATIA processes tree-model schematic diagram.
Embodiment
A kind of structural member digital control processing chain generation method that process program and machining cell merge mutually, is characterized in that key step is as follows:
1) process program builds;
2) process program and machining cell construct digital control processing chain mutually;
Wherein said process program builds, and comprises two basic technologies: (1) process program model; (2) process program builds rule;
Wherein, process program model adopts tree structure to represent, comprise part, lathe, station, operation, work step, program and cutter seven grades of nodes, these seven grades of nodes are set membership successively, as shown in Figure 1; Part node in tree structure is root node, and cutter pitch is leaf node, and i-th grade of node is the father node of the i-th+1 grade node, 1≤i≤6.To sum up, provide the BNF normal form that process program represents model, as follows:
< part node >::=(< part type >, < blank type >, < blank material >, < lathe node >} ...)
< lathe node >::=(< lathe code name >, < control system type >, < station node >} ...)
< station node >::=(< station direction >, < frock >, < procedure-node >} ...)
< procedure-node >::=(< operation numbering >, < operation title >, < process segment >, < work step node >} ...)
< work step node >::=(< work step numbering >, < technology characteristics >, < job operation >, < program node >} ...)
< program node >::=(< program name >, { < cutter pitch >} ...)
< cutter pitch >::=(< geometric parameter >, < process redundancy >, < cutting parameter > ...)
Yi Zhi, above-mentioned model can intactly express numerical control processing technology flow process, for the templating and fast custom realizing numerical control processing technology scheme provides basic model.
Based on this tree structure model, in conjunction with the typical process flow of aircraft structure, each class aircraft structure is set up process program template; On this basis, process program also must meet certain structure rule, and specific rules is as follows:
(1) priority is at each processing stations, and the design sequence of each work step must meet:
or
wherein
represent " having precedence over ";
(2) existence is for ensureing that process program meets technological requirement, and in process program, some work step must exist, and some work step can not exist, and wherein " 1 " represents to exist, and " 0 " represents not exist, and " 0 or 1 " represents to exist and do not exist;
(3) often cutter all must can be participated in actual cut in validity technological process and remove a certain amount of excess stock, to ensure that process program is effective, rule is as follows: set WP as a certain operation, WS
1, WS
2..., WS
nfor the work step sequence of WP, CT
1, CT
2..., CT
nfor WS
1, WS
2..., WS
ntool sequence, d
1, d
2..., d
n, m
r1, m
r2..., m
rnand m
a1, m
a2..., m
anbe respectively and CT
1, CT
2..., CT
ncorresponding diameter sequence, side direction surplus and axial surplus sequence, MP is the technology characteristics type of the required processing of operation WP, as infructescence WS
1, WS
2..., WS
nthe middle sub-work step sequence WS that there is processing MP
(1), WS
(2)..., WS
(k), and WS
(1), WS
(2)..., WS
(k)corresponding tool diameter and process redundancy sequence are respectively d
(1), d
(2)..., d
(k), m
(r1), m
(r2)..., m
(rk)and m
(a1), m
(a2)..., m
(ak), 1≤k≤n, then must meet: d
(1)>=d
(2)>=...>=d
(k), m
(r1)>=m
(r2)>=...>=m
(rk)and m
(a1)>=m
(a2)>=...>=m
(ak);
Wherein WS
rrepresent profile in roughing, namely under the prerequisite retaining allowance for finish and revise distortion institute made allowance, remove most of process redundancy;
WS
wrepresent finishing web, put in place by the processing of broad sense web;
WS
crepresent corner processing, namely remove the surplus of rotation angle position;
WS
ssrepresent profile in semi-finishing, namely remove the part process redundancy in upright side walls face again, discharge distortion further;
WS
sfrepresent outer rim in half finish-milling, namely remove the part process redundancy of inside and outside edge strip curved surface, discharge distortion further:
WS
fsrepresent profile in finishing, the upright side walls face by part is machined to design size;
WS
ffrepresent outer rim in finish-milling, namely, outer rim Machining of Curved Surface is to design size;
WS
trepresent and cut off processing, cut off from workpiece by part.
Described process program and machining cell construct digital control processing chain mutually, comprise the following steps:
1) process domain structure tree to build: adopt layering to ask friendship characteristic recognition method, build expansion slot descriptor tree shaped model and processing territory tree structure model, as shown in Figure 2, complete the identification of aircraft structure feature, wherein:
1.1) slot descriptor related description is as follows: complex-shaped surface mould is made up of profile, island, constraint end face and constraint bottom surface, and profile and island are formed by connecting according to certain sequence by multiple sidewall dough sheet, and there is the constraint end face of self and constraint bottom surface, this structure is claimed to be broad sense sidewall, be expressed as s, be divided into wheel profile and island-shaped, be expressed as s
p, s
i; On certain station direction, using profile and island as broad sense sidewall, and with constraint end face, retrain remote definition vallecular cavity feature together with bottom surface, and subsidiary characteristic is defined on broad sense sidewall, as caved in, muscle, corner, opening and closing angle etc., namely form expansion slot descriptor, be expressed as g, its BNF normal form is defined as follows:
< expands slot descriptor >::=(< station direction >, < identifies >, < retrains end face _ 1>, < retrains bottom surface _ 1>, { bottom surface }, < broad sense sidewall >, { broad sense sidewall }, [father's groove], { pilot trench })
< identifies >::=(< groove >|< opening >|< hole >)
< broad sense sidewall >::=(< side collection >, < type >, < retrain end face _ 2>, < retrains bottom surface _ 2>, { muscle }, { angle of release }, { closing angle }, { caving in }, { bottom roundings }, { corner }, { chamfering }, [frock] ...)
< type >::=(< profile >|< island >)
Wherein, expansion slot descriptor and each broad sense sidewall all have respective constraint end face and constraint bottom surface, might not be equal between them, and in addition, for ease of the finishing of sidewall node, a broad sense sidewall may belong to multiple expansion slot descriptor; Yi Zhi, expansion slot descriptor meets following character:
Character 1 on a certain station direction, if there is broad sense sidewall s, its side collection F={f
1, f
2..., f
n, constraint end face is p
t, constraint bottom surface is p
b, n>=2, so, by side f
1, f
2..., f
nand p
t, p
ba complete totally enclosed three-dimensional communication space must be formed;
Character 2, on a certain station direction, expands slot descriptor g if existed, by wheel profile broad sense sidewall s
pand several island-shaped broad sense sidewalls s
i1, s
i2..., s
in, constraint end face p
tand constraint bottom surface p
bformed, so, s
p, s
i1, s
i2..., s
inand p
t, p
ba complete totally enclosed three-dimensional communication space must be formed;
1.2) domain structure tree related description is processed as follows: do as one likes matter 2 known expansion slot descriptor defines a closed three-dimensional communication space, this space is the excess stock territory that this cavity feature of formation need be removed, therefore, the processing territory of available expansion slot descriptor tree shaped model definition and expression part, result is called the processing territory tree structure model of part, as shown in Figure 3, the root node of processing territory tree structure model is work territory σ, work territory σ is the summation in region to be processed after blank model deducts part model, as shown in fig. 4 a, the child node of σ is station direction, exist under each station several separate and exist set membership territory unit a, territory unit is the constraint end face of expansion slot descriptor, constraint bottom surface, the three dimensional closure material area that the side collection of wheel profile broad sense sidewall and island-shaped broad sense sidewall side collection surround, its BNF normal form can be expressed as: < territory unit >::=(< outline side collection >, { side, island collection }, < retrains end face >, < retrains bottom surface >, [father field unit], { subdomain unit }), work territory shown in Fig. 4 a can be divided into three territory units, a
1, a
2, a
3, as shown in Figure 4 b,
2) cutter mates with territory unit: the technological process described according to process program, extract process redundancy and the tool-information of each work step, based on the geometric attribute of processing territory unit, comprise height, minimum widith, side fillet value and bottom surface fillet value, choose the machinable slot descriptor feature of cutter;
3) machining cell builds: according to cutter can working ability, namely giving under definition cavity feature, tool geometrical parameter, side direction surplus and axial surplus condition, technical office's cutter can machining area, having can the different geometric configuration of machining area again, choose different process operations, and the geometric parameter of calculating processing operation; Have and machining area, process operation type, process operation geometric parameter, machined parameters and tool geometrical parameter can form machining cell, be illustrated in figure 6 machining cell instance graph.In Flight Structures NC Machining programming, the most frequently used process operation is that pocket machining operation operates two kinds with contour machining; Wherein
The geometric parameter BNF of pocket machining operation is expressed as follows:
Geometric parameter: :=(< retrains end face >, < retrains bottom surface >, < profile leads first >, { unit is led on island }, < axial surplus >, < radial slack >); As shown in Figure 5 a, wherein, profile leads unit and island are led unit and are closed-loop, and the number that unit is led on island is more than or equal to 0, in addition, easily know that above-mentioned geometric element defines a closed vallecular cavity, slot machining cutter rail can be completed in conjunction with cutter, policing parameter etc. and calculate;
The geometric parameter BNF of contour machining operation is expressed as follows:
Geometric parameter: :=(< retrains end face >, < retrains bottom surface >, < profile leads first >, [initial constraint unit], [stopping constraint unit], < axial surplus >, < radial slack >); As shown in Figure 5 b, wherein, it is the most important geometric element of contour machining that profile leads unit, both can be closed-loop, and also can be open loop, and initial constraint unit and termination constraint unit are for retraining the initial sum final position of cutter in process;
4) process program and machining cell merge: obtain often machinable for cutter machining cell sequence by step 3), under adding these machining cell sequences the cutter pitch of process program to, form the tree structure of 8 grades of nodes, this tree structure is the digital control processing chain of aircraft structure, as shown in Figure 7a, the technological process of part is expressed in microcosmic point; Digital control processing chain and CATIA process tree-model and there are mapping relations, under the cutter pitch of correspondence, machining cell between them and process operation map one by one, by by the process operation optimum configurations of machining cell in the process operation of instantiation, robotization can generate digital control processing file, as shown in Figure 7b.
Claims (1)
1. the structural member digital control processing chain generation method that merges mutually with machining cell of a process program, is characterized in that key step is as follows:
1) process program builds;
2) process program and machining cell construct digital control processing chain mutually;
Wherein said process program builds, and comprises two basic technologies: (1) process program model; (2) process program builds rule;
Wherein, process program model adopts tree structure to represent, comprise part, lathe, station, operation, work step, program and cutter seven grades of nodes, these seven grades of nodes are set membership successively; Based on this tree structure model, in conjunction with the typical process flow of aircraft structure, each class aircraft structure is set up process program template; On this basis, process program also must meet certain structure rule, and specific rules is as follows:
(1) priority is at each processing stations, and the design sequence of each work step must meet: WS
r< WS
w< WS
c< WS
ss< WS
sf< WS
fs< WS
ffor WS
r< WS
w< WS
ss< WS
sf< WS
c< WS
fs< WS
ff, wherein " < " expression " has precedence over ";
(2) existence is for ensureing that process program meets technological requirement, and in process program, some work step must exist, and some work step can not exist, and wherein " 1 " represents to exist, and " 0 " represents not exist, and " 0 or 1 " represents to exist and do not exist;
(3) often cutter all must can be participated in actual cut in validity technological process and remove a certain amount of excess stock, to ensure that process program is effective, rule is as follows: set WP as a certain operation, WS
1, WS
2..., WS
nfor the work step sequence of WP, CT
1, CT
2..., CT
nfor WS
1, WS
2..., WS
ntool sequence, d
1, d
2..., d
n, m
r1, m
r2..., m
rnand m
a1, m
a2..., m
anbe respectively and CT
1, CT
2..., CT
ncorresponding diameter sequence, side direction surplus and axial surplus sequence, MP is the technology characteristics type of the required processing of operation WP, as infructescence WS
1, WS
2..., WS
nthe middle sub-work step sequence WS that there is processing MP
(1), WS
(2)..., WS
(k), and WS
(1), WS
(2)..., WS
(k)corresponding tool diameter and process redundancy sequence are respectively d
(1), d
(2)..., d
(k), m
(r1), m
(r2)..., m
(rk)and m
(a1), m
(a2)..., m
(ak), 1≤k≤n, then must meet: d
(1)>=d
(2)>=...>=d
(k), m
(r1)>=m
(r2)>=...>=m
(rk)and m
(a1)>=m
(a2)>=...>=m
(ak);
Wherein WS
rrepresent profile in roughing, namely under the prerequisite retaining allowance for finish and revise distortion institute made allowance, remove most of process redundancy;
WS
wrepresent finishing web, put in place by the processing of broad sense web;
WS
crepresent corner processing, namely remove the surplus of rotation angle position;
WS
ssrepresent profile in semi-finishing, namely remove the part process redundancy in upright side walls face again, discharge distortion further;
WS
sfrepresent outer rim in half finish-milling, namely remove the part process redundancy of inside and outside edge strip curved surface, discharge distortion further:
WS
fsrepresent profile in finishing, the upright side walls face by part is machined to design size;
WS
ffrepresent outer rim in finish-milling, namely, outer rim Machining of Curved Surface is to design size;
WS
trepresent and cut off processing, cut off from workpiece by part;
Described process program and machining cell construct digital control processing chain mutually, comprise the following steps:
1) process domain structure tree to build: adopt layering to ask friendship characteristic recognition method, build expansion slot descriptor tree shaped model and processing territory tree structure model, complete the identification of aircraft structure feature, wherein:
1.1) slot descriptor related description is as follows: complex-shaped surface mould is made up of profile, island, constraint end face and constraint bottom surface, and profile and island are formed by connecting according to certain sequence by multiple sidewall dough sheet, and there is the constraint end face of self and constraint bottom surface, this structure is claimed to be broad sense sidewall, be expressed as s, be divided into wheel profile and island-shaped, be expressed as s
p, s
i; On certain station direction, using profile and island as broad sense sidewall, and with constraint end face, retrain remote definition vallecular cavity feature together with bottom surface, and subsidiary characteristic is defined on broad sense sidewall, as caved in, muscle, corner, opening and closing angle etc., namely form expansion slot descriptor, be expressed as g, its BNF normal form is defined as follows:
< expands slot descriptor >::=(< station direction >, < identifies >, < retrains end face _ 1>, < retrains bottom surface _ 1>, { bottom surface }, < broad sense sidewall >, { broad sense sidewall }, [father's groove], { pilot trench })
< identifies >::=(< groove >|< opening >|< hole >)
< broad sense sidewall >::=(< side collection >, < type >, < retrain end face _ 2>, < retrains bottom surface _ 2>, { muscle }, { angle of release }, { closing angle }, { caving in }, { bottom roundings }, { corner }, { chamfering }, [frock] ...)
< type >::=(< profile >|< island >)
Wherein, expansion slot descriptor and each broad sense sidewall all have respective constraint end face and constraint bottom surface, might not be equal between them, and in addition, for ease of the finishing of sidewall node, a broad sense sidewall may belong to multiple expansion slot descriptor; Yi Zhi, expansion slot descriptor meets following character:
Character 1 on a certain station direction, if there is broad sense sidewall s, its side collection F={f
1, f
2..., f
n, constraint end face is p
t, constraint bottom surface is p
b, n>=2, so, by side f
1, f
2..., f
nand p
t, p
ba complete totally enclosed three-dimensional communication space must be formed;
Character 2, on a certain station direction, expands slot descriptor g if existed, by wheel profile broad sense sidewall s
pand several island-shaped broad sense sidewalls s
i1, s
i2..., s
in, constraint end face p
tand constraint bottom surface p
bformed, so, s
p, s
i1, s
i2..., s
inand p
t, p
ba complete totally enclosed three-dimensional communication space must be formed;
1.2) domain structure tree related description is processed as follows: do as one likes matter 2 known expansion slot descriptor defines a closed three-dimensional communication space, this space is the excess stock territory that this cavity feature of formation need be removed, therefore, the processing territory of available expansion slot descriptor tree shaped model definition and expression part, result is called the processing territory tree structure model of part, the root node of processing territory tree structure model is work territory σ, the child node of σ is station direction, exist under each station several separate and exist set membership territory unit a; The three dimensional closure material area that territory unit is the constraint end face of expansion slot descriptor, constraint bottom surface, the side collection of wheel profile broad sense sidewall and island-shaped broad sense sidewall side collection surround, its BNF normal form can be expressed as: < territory unit >::=(< outline side collection >, { side, island collection }, < retrains end face >, < retrains bottom surface >, [father field unit], { subdomain unit })
2) cutter mates with territory unit: the technological process described according to process program, extract process redundancy and the tool-information of each work step, based on the geometric attribute of processing territory unit, comprise height, minimum widith, side fillet value and bottom surface fillet value, choose the machinable slot descriptor feature of cutter;
3) machining cell builds: according to cutter can working ability, namely giving under definition cavity feature, tool geometrical parameter, side direction surplus and axial surplus condition, technical office's cutter can machining area, having can the different geometric configuration of machining area again, choose different process operations, and the geometric parameter of calculating processing operation; Have and machining area, process operation type, process operation geometric parameter, machined parameters and tool geometrical parameter can form machining cell, in Flight Structures NC Machining programming, the most frequently used process operation is that pocket machining operation operates two kinds with contour machining; Wherein
The geometric parameter BNF of pocket machining operation is expressed as follows:
Geometric parameter: :=(< retrains end face >, < retrains bottom surface >, < profile leads first >, { unit is led on island }, < axial surplus >, < radial slack >); Wherein, profile leads unit and island are led unit and are closed-loop, and island are led first number and are more than or equal to 0, in addition, easily knows that above-mentioned geometric element defines a closed vallecular cavity, can complete the calculating of slot machining cutter rail in conjunction with cutter, policing parameter etc.;
The geometric parameter BNF of contour machining operation is expressed as follows:
Geometric parameter: :=(< retrains end face >, < retrains bottom surface >, < profile leads first >, [initial constraint unit], [stopping constraint unit], < axial surplus >, < radial slack >); Wherein, it is the most important geometric element of contour machining that profile leads unit, both can be closed-loop, and also can be open loop, and initial constraint unit and termination constraint unit are for retraining the initial sum final position of cutter in process;
4) process program and machining cell merge: by step 3) obtain often machinable for cutter machining cell sequence, under adding these machining cell sequences the cutter pitch of process program to, form the tree structure of 8 grades of nodes, this tree structure is the digital control processing chain of aircraft structure, expresses the technological process of part in microcosmic point; Digital control processing chain and CATIA process tree-model and there are mapping relations, under the cutter pitch of correspondence, machining cell between them and process operation map one by one, by by the process operation optimum configurations of machining cell in the process operation of instantiation, robotization can generate digital control processing file.
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