CN103065207A - Engine cylinder block process route planning method based on machining elements - Google Patents

Abstract

An engine cylinder block process route planning method based on machining elements comprises the following steps: (1) building a cylinder block information description based on a feature layer and a feature attribute layer; (2) based on the cylinder block description, making sure the machining chain of each feature fi, refining the machining chain of each feature fi so as to make sure each machining element fmeij, and building an integrated cylinder block process information model FME based on the machining element fmeij information; (3) analyzing the factors, such as the geometrical shape, the technical requirement, the process method and the optimization constraints, of the cylinder block, based on the basic principles of process route design, building a sequencing optimization mathematical model based on the cylinder block process information model FME; (4) based on the precedence relationship of the machining element, solving the established mathematical models, so as to gain the optimized process route. By refining the cylinder block features to get the machining elements, in order to resolve the engine cylinder block process, a feasible process route planning method based on the machining elements is put forward. By means of a heuristic type overall optimization on the sequencing of the process route, a partial optimization result is avoided.

Description

Engine cylinder-body process route planing method based on processing unit

Technical field

The invention belongs to the process planning field, particularly a kind of engine cylinder-body process route planing method.

Background technology

Technological design is to realize technological process and formulate the activity that the detailed operation plan is carried out, is to connect the bridge that product design and product are made, and be to finish the key link that product design information is changed to manufacturing information, manufacturing system there is important impact.The quality of technological design directly affects the aspects such as allocation and optimization, product quality, organization of production efficient, cost of products and production cycle that enterprise makes resource.Mechanical processing technique designs problem to be solved: according to the designing requirement of product, determine that part is converted to needed a series of job operations of end-state, processing sequence, tooling device of regulation etc. from virgin state.

Technological design is typical challenge in the part manufacture process, comprise miscellaneous service work of different nature and the functional requirements such as analysis, selection, planning and optimization, scope of design is wide, contain much information, closely related with concrete production environment and personal experience again, be a technical and empirical very strong job.Because the complicacy of the personalized and constraint of the diversity of part machining feature and job operation, processing request, when ordering feasible program quantity larger, that meet process rule is more, simple dependence experience is difficult to obtain the sequencing schemes of optimum or suboptimum, nor can use the classic algorithm of traditional logical decision or operational research such as the methods such as integer programming, dynamic programming or branch-and-bound to find the solution.

Find through the literature search to prior art, Xu Yuezeng is for the characteristics of box parts, set forth the feature profile describing method of box parts, set up the job operation matching rule base of different characteristic, realize the decision-making of part feature key element job operation, study simultaneously the optimization problem of part by one-step clamping, set up mathematical model, realize decision-making and the work step ordering of box parts characteristic element job operation.J.Chen etc. use the process planning problem of Hopfield network and simulated annealing solution prism part, the sequencing problem of feature is transformed into the traveling salesman problem (a kind of mathematical programming problem) of constraint, and the priority ranking of feature and tolerance are as constraint condition.The mixed black Slab that J.S.Huang and A.M.William set up based on mixed inference comes the processing feature relation, and its core algorithm is divided into four steps: defined feature and relevant important information thereof; Determine the precedence of feature according to given constraint and ranking criteria; Feature ordering; To the additional manufacturing procedure of feature.M.Horvath etc. propose the Process Planning Method of knowledge-based inference and genetic algorithm.Adopt the method for knowledge-based inference to generate preliminary process route scheme, then use exchange in the genetic algorithm, mutation operation process route is carried out local and the improvement overall situation, obtain new process route.

More than only carry out research in theoretical aspect about what the process route method had, do not consider the technological requirement under the actual processing environment, lack practicality; The local process decision problem of part machining process is only considered in these researchs, does not have the process decision process of the whole processing technology of systematic study part.Reasonably process route not only can optimize and save make resource, shorten the product manufacturing cycle, the reduction manufacturing cost, can also improve the quality of products and promote technological progress in enterprises.Therefore, be necessary to provide a kind of planning of engine cylinder-body process route, to improve global optimization efficient, obtain the process route of optimum or near-optimization

Summary of the invention

The objective of the invention is for the deficiency in the existing process route optimization, a kind of engine cylinder-body skill route planning method based on processing unit is proposed, make it from processing the angle of unit, under the condition that satisfies various process constraints and optimization aim, the optimization of the process route of cylinder body is converted into optimization based on the process route of processing unit.

The solution of the present invention is as follows:

A kind of engine cylinder-body process route planing method based on processing unit may further comprise the steps,

Step 1 is set up based on the cylinder body information of characteristic layer and characteristic attribute layer and is described: according to the feature f of engine cylinder-body _i, cylinder body information is divided into characteristic layer, and each the feature f in the analytical characteristic layer _iAttribute, form the characteristic attribute layer;

Step 2 is described definite each feature f based on described cylinder body information _iMachining chain, the described feature f of refinement _iMachining chain to determine the first fme of processing _Ij, and set up based on the first fme of described processing _IjCylinder body technique information model FME, described cylinder body technique information model be based on cylinder body all processing metamessages set, be expressed as:

FME=(fme _ij)i=1,2,...,NP，j=1,2,...,NS _i；

Step 3, the mathematical model that foundation is sorted and optimized the first process route of processing among the described cylinder body technique information model FME: the factors such as geometric configuration, technical requirement, process and optimization constraint of analyzing cylinder body, according to the cardinal rule of Process Route Planning, set up the ordering optimized mathematical model based on described cylinder body technique information model FME;

Step 4 according to the precedence relationship of processing unit, is found the solution the process route that is optimized to the mathematical model of setting up.

In the described step 1, characteristic layer is used for describing each feature f of composition cylinder body _iBetween relation, to construct the characteristic relation figure of cylinder body, comprise between the main feature, between main feature and the supplemental characteristic and the relation between the supplemental characteristic; Described characteristic attribute layer is to feature f _iFurther complete description comprises the secondary attribute information of the primary attribute of feature title, characteristic direction etc. and physical dimension attribute, position dimension attribute, form and position tolerance attribute, machining chain attribute etc.

In the described step 2, cylinder body feature f _iMachining chain be cylinder body feature f _iJob sequence set, be expressed as:

$S=(({\mathrm{MP}}_{i1},f_{i1}),({\mathrm{MP}}_{i2},f_{i2}),\·\·\·,({\mathrm{MP}}_{{\mathrm{NS}}_i},f_i)),i=\mathrm{1,2},\·\·\·,\mathrm{NP}$

Wherein, NS _iRepresentation feature f _iThe job sequence number that needs from blank, at first adopts job operation MP _I1Process intermediate features f _I1Then use job operation MP _I2Process intermediate features f _I2, until adopt job operation Process qualified shape facility f _iTill.

Described processing unit is the wherein set of the processing technology information of a job sequence in the machining chain, is the elementary cell of machining chain.

Described processing unit with seven element group representations is:

fme _ij=(ID,f _i,MP _ij,ML _ij,MM _ij,MT _ij,MS _ij)i=1,2,...,NP，j=1,2,...,NS _i

Wherein, ID represents to process primitive encoding, MP _IjBe illustrated in process segment ML _IjTo feature f _iCarry out the job operation that machining adopts, MM _Ij, MT _IjAnd MS _IjJob operation MP is adopted in expression _IjMachining feature f _iRequired lathe, cutter and anchor clamps etc. are made resource, and NP is the feature sum of part.

In the described step 3, the constraint that needs to consider is expressed as following functional form:

S=f(P,Me,G,Dev,Tec,Cp)

S in the formula---process route;

P---selected job operation set;

Me---machining tool set;

Each morphology of G---part;

Dev---each surperficial form and position tolerance;

The technological requirement of the character of the division in Tec---process segment, the processing of benchmark and thermal treatment and other aided process;

Cp---processing charges.

In the described step 3, according to the cardinal rule of Process Route Planning, the relation of processing unit comprises:

(a) if benchmark relation is arranged between the feature, before then will being placed on as the processing unit of the feature of benchmark, have the processing unit of the feature of benchmark relation to be placed on reference characteristic after;

(b) if the acted as reference mutual relation is arranged between the feature, then successively sequentially first as the sequence arrangement processing of benchmark according to feature;

(c) if positioning relation is arranged between the feature, before the processing unit that then will determine the further feature position is placed on, after the processing unit that is determined the position is placed on;

(d) if secondary relationship is arranged between the feature, the sequencing that is then produced by feature is determined the sequencing of processing unit;

(e) if the position accuracy demand relation is arranged between the feature, then these processing units are processed in the one-time positioning clamping;

(f) if similar feature association relation is arranged between the feature, then these processing units are concentrated in the least possible operation.

In the described step 3, satisfy the process route mathematical model of optimization aim, be expressed as:

min?F(x)

F(x)=α _FF _F(x)+α _CF _C(x)+α _MF _M(x)

$F_F\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\max [\mathrm{\δ}(G_{i}D,G_{i+1}D),\mathrm{\δ}(G_i\mathrm{FS},G_{i+1}\mathrm{FS}),\mathrm{\δ}(G_i{F}_t,G_{i+1}{F}_t)]$

$F_C\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\left[\mathrm{\δ}(G_{i}C,G_{i+1}C)\right]$

$F_M\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\left[\mathrm{\δ}(G_{i}M,G_{i+1}M)\right]$

In the formula, α _F, α _CAnd α _MBe respectively the weight coefficient of jig transformation number of times, number of changing knife and lathe number of transitions, determined as the case may be by the technologist; F _F(x), F _C(x), F _M(x) represent respectively clamping times, number of changing knife and lathe number of transitions; G _iD, G _iFS, G _iFt, G _iC, G _iM represents respectively to process positioning datum, fixturing surface, anchor clamps, cutter and the lathe of using.

In the described step 4, use Global Genetic Simulated Annealing Algorithm mathematical model is found the solution.

Described Global Genetic Simulated Annealing Algorithm may further comprise the steps:

1) carries out gene code to processing unit, produce at random the population of some as initial solution;

Processing unit carries out being expressed as fme=(ID, f, MP, ML, MM, MT, MS) behind the gene code, and wherein: ID, f, MP, ML, MM, MT and MS are respectively processing first numbering, machining feature, job operation, required lathe, cutter and anchor clamps,

Wherein, a processing unit in the set of gene representation cylinder body processing unit, chromosome is a kind of processing metasequence of cylinder body, has represented a kind of process program of cylinder body.First for a plurality of processing that require continuously processing or simultaneously processing, can merge into one;

2) adopt the wheel disc method that the individuality in the population is pressed the ordering of fitness size, individuality in the annealing process is accepted according to the Metropolis criterion, when the fitness value that reaches certain value or optimum individual when iterations remains unchanged, stop the optimum job sequence of algorithm output.

Beneficial effect of the present invention is as follows: for the diversity of engine cylinder body processing feature and job operation, the personalization of processing request and the complicacy of constraint, when the feasible program quantity that meets process rule is more, utilize the complementarity between the algorithm optimization mechanism, improve global optimization efficient, obtain the process route of optimum or near-optimization.

Description of drawings

Fig. 1 is the engine cylinder-body process route planning flow chart based on processing unit;

Fig. 2 is operation of the present invention, work step and processing unit graph of a relation;

Fig. 3 is the process flow diagram of Global Genetic Simulated Annealing Algorithm of the present invention.

Embodiment

The present invention is further illustrated below in conjunction with content of the present invention and accompanying drawing embodiment.

Flow process of the present invention as shown in Figure 1, a kind of engine cylinder-body process route planing method based on processing unit, it may further comprise the steps:

Step 1, set up based on the cylinder body information of characteristic layer and characteristic attribute layer and describe: according to the feature of engine cylinder-body, cylinder body information is divided into characteristic layer, and the attribute of each the feature fi in the analytical characteristic layer, form the characteristic attribute layer;

In the present embodiment, the characteristic layer in the step 1 is used for describing the relation that forms between each feature of cylinder body, to construct the characteristic relation figure of cylinder body, comprises between the main feature, between main feature and the supplemental characteristic and the relation between the supplemental characteristic.Wherein, main feature is the feature for the overall geometry shape of detail of construction.Supplemental characteristic depends on main feature or other the auxiliary features, is the further modification to main feature or other supplemental characteristics.The characteristic attribute layer refers to the secondary attribute information of the primary attribute of feature title, characteristic direction etc. and physical dimension attribute, position dimension attribute, form and position tolerance attribute, machining chain attribute etc.The characteristic attribute layer is further to the complete description of feature fi, is used for describing the specific object of each feature fi of cylinder body.The cylinder body information of taking this kind method to set up is described, and can avoid the independence of feature, makes that the process planning result's is more accurate.

Step 2 is described definite each feature f based on cylinder body information _iMachining chain, refinement feature f _i, machining chain to determine the first fme of processing _Ij, and based on the first fme of processing _IjSet up cylinder body technique information model FME, cylinder body technique information model is based on the set of the information of all processing units of cylinder body, is expressed as:

FME=(fme _ij)i=1,2,...,NP，j=1,2,...,NS _i；

In the step 2, from the process of cylinder body, to each feature f _i, generally to could form final feature f through repeatedly processing _i, so machining chain is feature f _iJob sequence set, be expressed as: $S=(({\mathrm{MP}}_{i1},f_{i1}),({\mathrm{MP}}_{i2},f_{i2}),\·\·\·,({\mathrm{MP}}_{{\mathrm{NS}}_i},f_i)),i=\mathrm{1,2},\·\·\·,\mathrm{NP}$

Wherein, NS _iRepresentation feature f _iThe job sequence number that needs.From blank, at first adopt job operation MP _I1Process intermediate features f _I1Then use job operation MP _I2Process intermediate features f _I2, until adopt job operation

Process qualified shape facility f _iTill.

Processing unit is the wherein set of the processing technology information in a process segment in the machining chain, is the elementary cell of machining chain.In the present embodiment, processing unit with seven element group representations is:

fme _ij=(ID,f _i,MP _ij,ML _ij,MM _ij,MT _ij,MS _ij)i=1,2,...,NP，j=1,2,...,NS _i

Wherein, ID represents to process primitive encoding, MP _IjBe illustrated in process segment ML _IjTo feature f _iCarry out the job operation that machining adopts, MM _Ij, MT _IjAnd MS _IjJob operation MP is adopted in expression _IjMachining feature f _iRequired lathe, cutter and anchor clamps etc. are made resource, and NP is the feature sum of part.In actual applications, the Consideration of processing unit also can be deleted as the case may be.

Process is a changing process of cylinder body feature configuration, because in process, each feature is in a kind of machining state, therefore the status information of process route can be demarcated by a plurality of processing unit, cylinder body technique information model is based on the set of the information of all processing units of cylinder body, and the form of embodying is:

FME=(fme _ij)i=1,2,...,NP，j=1,2,...,NS _i

Step 3, the mathematical model that foundation is sorted and optimized the first process route of processing among the cylinder body technique information model FME: the factors such as geometric configuration, technical requirement, process and optimization constraint of analyzing cylinder body, according to the cardinal rule of Process Route Planning, set up the ordering optimized mathematical model based on processing unit.

Feature fi processes centered by the unit, one group of machining information of processing unit mapping of every one-phase.Be comprised of the first institute of a plurality of processing from the blank to the cylinder body, each processing unit comprises corresponding machining information.All machining feature f with particular cylinder block _iAfter information is refined as a plurality of processing unit, according to the considerations demand that should be noted that in the process, from overall angle, to whole feature f among the cylinder body technique information model FME _iProcessing unit sort.

Processing unit carries out in the sequencer procedure in cylinder body technique information model FME, and the constraint that consider is numerous, and such as the selection of characteristic processing method, the selection of lathe and the selection of cutter etc., so constraint can be expressed as following functional form:

S=f(P,Me,G,Dev,Tec,Cp)

S in the formula---process route;

P---selected job operation set;

Me---machining tool set;

Each morphology of G---part;

Dev---each surperficial form and position tolerance;

The technological requirements such as character of the division in Tec---process segment, the processing of benchmark and thermal treatment and other aided process;

Cp---processing charges.

In addition, according to the cardinal rule of Process Route Planning, the relation of processing unit comprises:

(a) if benchmark relation is arranged between the feature, before then will being placed on as the processing unit of the feature of benchmark, have the processing unit of the feature of benchmark relation to be placed on reference characteristic after;

(b) if the acted as reference mutual relation is arranged between the feature, then successively sequentially first as the sequence arrangement processing of benchmark according to feature;

(c) if positioning relation is arranged between the feature, before the processing unit that then will determine the further feature position is placed on, after the processing unit that is determined the position is placed on;

(d) if secondary relationship is arranged between the feature, the sequencing that is then produced by feature is determined the sequencing of processing unit;

(e) if the position accuracy demand relation is arranged between the feature, then these processing units are processed in the one-time positioning clamping;

(f) if similar feature association relation is arranged between the feature, then these processing units are concentrated in the least possible operation.

Relation between the above-mentioned feature namely refers to different feature fi(i=1,2 ..., the mutual relationship between N).

In actual process, in order to improve the crudy of part, shorten the manufacturing cycle, need reduction to make the replacement frequency of resource (lathe, cutter or anchor clamps etc.) as far as possible.Because the frequent of benchmark can cause the clamping error, be unfavorable for the stability of technological process; Increasing the time that can increase non-cut of number of changing knife reduces the utilization ratio of lathe.According to cardinal rule and other considerations of above considerations, Process Route Planning, the final process route mathematical model of determining to satisfy the first ordering of processing optimization aim is expressed as:

min?F(x)

F(x)=α _FF _F(x)+α _CF _C(x)+α _MF _M(x)

$F_F\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\max [\mathrm{\δ}(G_{i}D,G_{i+1}D),\mathrm{\δ}(G_i\mathrm{FS},G_{i+1}\mathrm{FS}),\mathrm{\δ}(G_i{F}_t,G_{i+1}{F}_t)]$

$F_C\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\left[\mathrm{\δ}(G_{i}C,G_{i+1}C)\right]$

$F_M\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\left[\mathrm{\δ}(G_{i}M,G_{i+1}M)\right]$

In the formula, α _F, α _CAnd α _MBe respectively the weight coefficient of jig transformation number of times, number of changing knife and lathe number of transitions, determined as the case may be by the technologist.F _F(x), F _C(x), F _M(x) represent respectively clamping times, number of changing knife and lathe number of transitions; G _iD, G _iFS, G _iFt, G _iC, G _iM represents respectively to process positioning datum, fixturing surface, anchor clamps, cutter and the lathe of using.

Step 4 according to the precedence relationship of processing unit, is found the solution the process route that is optimized to the mathematical model of setting up.

In the present embodiment, carry out the optimization of process route based on Global Genetic Simulated Annealing Algorithm, mathematical model is found the solution.

The process flow diagram of Global Genetic Simulated Annealing Algorithm as shown in Figure 3.Detailed process is as follows:

At first carry out gene code to processing unit, produce at random the population of some as initial solution.

To process unit carries out being expressed as fme=(ID, f, MP, ML, MM, MT, MS) behind the gene code: ID, f, MP, ML, MM, MT and MS are respectively the first numbering of processing, machining feature, job operation, required lathe, cutter and anchor clamps.

Wherein, a processing unit in the set of gene representation cylinder body processing unit, chromosome is a kind of processing metasequence of cylinder body, has represented a kind of process program of cylinder body.First for a plurality of processing that require continuously processing or simultaneously processing, can merge into one.

Then adopt the wheel disc method that the individuality in the population is sorted by the fitness size.Avoid because losing of some information of selecting to cause guarantees algorithm complexity by variation and intersection.Individuality in the annealing process is accepted according to Metropolis criterion (simulated annealing), when the fitness value that reaches certain value or optimum individual when iterations remains unchanged, stops the optimum job sequence of algorithm output.

Adopt the engine cylinder-body process route planing method based on processing unit disclosed in this invention, the impacts such as geometric configuration, technical requirement, process and optimization constraint of cylinder body have been taken into full account, be characterized as processing unit by the segmentation cylinder body, for the technique that solves engine cylinder-body has proposed a feasible process route planing method based on processing unit, heuristic global optimizing is carried out in ordering to process route, has avoided local optimum result's generation.

The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.

Claims (10)

1. engine cylinder-body process route planing method based on processing unit is characterized in that: may further comprise the steps,

Step 1 is set up based on the cylinder body information of characteristic layer and characteristic attribute layer and is described: according to the feature f of engine cylinder-body _i, cylinder body information is divided into characteristic layer, and each the feature f in the analytical characteristic layer _iAttribute, form the characteristic attribute layer;

Step 2 is described definite each feature f based on described cylinder body information _iMachining chain, the described feature f of refinement _iMachining chain to determine the first fme of processing _Ij, and set up based on the first fme of described processing _IjCylinder body technique information model FME, described cylinder body technique information model be based on cylinder body all processing metamessages set, be expressed as:

FME=(fme _ij)i=1,2,...,NP，j=1,2,...,NS _i；

Step 3, the mathematical model that foundation is sorted and optimized the first process route of processing among the described cylinder body technique information model FME: analyze geometric configuration, technical requirement, the process of cylinder body and optimize constraint, according to the cardinal rule of Process Route Planning, set up the ordering optimized mathematical model based on processing unit among the described cylinder body technique information model FME;

Step 4 according to the precedence relationship of processing unit, is found the solution the process route that is optimized to the mathematical model of setting up.

2. described based on the first engine cylinder-body process route planing method of processing according to claim 1, it is characterized in that: in the described step 1, characteristic layer is used for describing each feature f of composition cylinder body _iBetween relation, to construct the characteristic relation figure of cylinder body, comprise between the main feature, between main feature and the supplemental characteristic and the relation between the supplemental characteristic; Described characteristic attribute layer is to feature f _iFurther complete description.

3. according to claim 1 based on the first engine cylinder-body process route planing method of processing, it is characterized in that: in the described step 2, cylinder body feature f _iMachining chain be cylinder body feature f _iJob sequence set, be expressed as: $S=(({\mathrm{MP}}_{i1},f_{i1}),({\mathrm{MP}}_{i2},f_{i2}),\·\·\·,({\mathrm{MP}}_{N{S}_i},f_i)),i=\mathrm{1,2},\·\·\·,\mathrm{NP}$

Wherein, NS _iRepresentation feature f _iThe job sequence number that needs from blank, at first adopts job operation MP _I1Process intermediate features f _I1Then use job operation MP _I2Process intermediate features f _I2, until adopt job operation

Process qualified shape facility f _iTill.

4. according to claim 3 based on the first engine cylinder-body process route planing method of processing, it is characterized in that: described processing is first in the wherein set of the processing technology information of a job sequence in the machining chain, is the elementary cell of machining chain.

5. the engine cylinder-body process route planing method based on processing unit according to claim 4 is characterized in that: described processing unit with seven element group representations is:

fme _ij=(ID,f _i,MP _ij,ML _ij,MM _ij,MT _ij,MS _ij)i=1,2,...,NP，j=1,2,...,NS _i

Wherein, ID represents to process primitive encoding, MP _IjBe illustrated in process segment ML _IjTo feature f _iCarry out the job operation that machining adopts, MM _Ij, MT _IjAnd MS _IjJob operation MP is adopted in expression _IjMachining feature f _iRequired manufacturing resource, NP is the feature sum of part.

6. according to claim 1 based on the first engine cylinder-body process route planing method of processing, it is characterized in that: in the described step 3, the constraint that needs to consider is expressed as following functional form:

S=f(P,Me,G,Dev,Tec,Cp)

S in the formula---process route;

P---selected job operation set;

Me---machining tool set;

Each morphology of G---part;

Dev---each surperficial form and position tolerance;

The technological requirement of the character of the division in Tec---process segment, the processing of benchmark and thermal treatment and other aided process;

Cp---processing charges.

7. according to claim 1 based on the first engine cylinder-body process route planing method of processing, it is characterized in that: in the described step 3, according to the cardinal rule of Process Route Planning, the relation of processing unit comprises:

(a) if benchmark relation is arranged between the feature, before then will being placed on as the processing unit of the feature of benchmark, have the processing unit of the feature of benchmark relation to be placed on reference characteristic after;

(b) if the acted as reference mutual relation is arranged between the feature, then successively sequentially first as the sequence arrangement processing of benchmark according to feature;

(c) if positioning relation is arranged between the feature, before the processing unit that then will determine the further feature position is placed on, after the processing unit that is determined the position is placed on;

(d) if secondary relationship is arranged between the feature, the sequencing that is then produced by feature is determined the sequencing of processing unit;

(e) if the position accuracy demand relation is arranged between the feature, then these processing units are processed in the one-time positioning clamping;

(f) if similar feature association relation is arranged between the feature, then these processing units are concentrated in the least possible operation.

8. according to claim 1 based on the first engine cylinder-body process route planing method of processing, it is characterized in that: in the described step 3, satisfy the process route mathematical model of optimization aim, be expressed as:

min?F(x)

F(x)=α _FF _F(x)+α _CF _C(x)+α _MF _M(x)

$F_F\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\max [\mathrm{\δ}(G_{i}D,G_{i+1}D),\mathrm{\δ}(G_i\mathrm{FS},G_{i+1}\mathrm{FS}),\mathrm{\δ}(G_i{F}_t,G_{i+1}{F}_t)]$

$F_C\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\left[\mathrm{\δ}(G_{i}C,G_{i+1}C)\right]$

$F_M\left(x\right)=\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}\left[\mathrm{\δ}(G_{i}M,G_{i+1}M)\right]$

In the formula, α _F, α _CAnd α _MBe respectively the weight coefficient of jig transformation number of times, number of changing knife and lathe number of transitions;

F _M(x) represent respectively clamping times, number of changing knife and lathe number of transitions;

G _iD, G _iFS, G _iFt, G _iC, G _iM represents respectively to process positioning datum, fixturing surface, anchor clamps, cutter and the lathe of using.

9. the engine cylinder-body process route planing method based on processing unit according to claim 1 is characterized in that: in the described step 4, use Global Genetic Simulated Annealing Algorithm mathematical model is found the solution.

10. according to claim 9 based on the first engine cylinder-body process route planing method of processing, it is characterized in that: described Global Genetic Simulated Annealing Algorithm may further comprise the steps:

1) carries out gene code to processing unit, produce at random the population of some as initial solution, processing unit carries out being expressed as fme=(ID behind the gene code, f, MP, ML, MM, MT, MS), wherein: ID, f, MP, ML, MM, MT and MS are respectively processing first numbering, machining feature, job operation, required lathe, cutter and anchor clamps;

2) adopt the wheel disc method that the individuality in the population is pressed the ordering of fitness size, individuality in the annealing process is accepted according to the Metropolis criterion, when the fitness value that reaches certain value or optimum individual when iterations remains unchanged, stop the optimum job sequence of algorithm output.

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