CN106096125A - One not uniform thickness tailor welded weld line optimization method - Google Patents
One not uniform thickness tailor welded weld line optimization method Download PDFInfo
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Abstract
The invention discloses a kind of being applicable to, based on mesh mapping and genetic algorithm, automobile tailor welded covering plate weld line is carried out the technique optimization method of reasonable Arrangement.The method comprises the steps, step one: set up phantom；Step 2: mesh mapping Inverse seeking design weld line initial threshold position on plate；Step 3: determine method for designing obtain sample number strong point: step 4: structure compound condition response surface model: step 5: solving-optimizing approximate model: step 6: according to Optimized model optimal solution combination carry out simulation analysis assay.Adjusting process state modulator weld line position deviation and the mode of production by artificial Experience Design plate weld line is relied on to compare compared with simple, by setting up phantom, method plate weld line shaped position being carried out process optimization by mesh mapping, Binding experiment, can improve tailor welded weld line stamping after positional precision, improve forming property.
Description
Technical field
The invention discloses one to be applicable to based on mesh mapping and genetic algorithm automobile tailor welded covering plate
Weld line carries out the technique optimization method of reasonable Arrangement.
Background technology
The steel plate splicing of unlike material different-thickness can be become a complete stamping blanks by laser assembly solder technology, is to realize
One of important channel of body lightening, has obtained extensively application in vehicle body punching press field.During actual punching production, flat
Can there is the change of shape and position with the plastic deformation of plate in weld line on plate blank material, produces drift, final and product
Design weld line produces deviation, therefore needs to control the drift of weld line in punching course, is allowed to and designs the position of weld line
Put deviation within the margin of tolerance.The drift controlling weld line at present has two ways, one to be by technology controlling and process, and adjustment is drawn
Prolong muscle restraining forces and blank shape and control shape and the positional precision of final weld line.Due to strength-differential effect and blank shape
Shape can form the biggest impact to the quality that punching press is final, and the actual effect that therefore method of technology controlling and process weld seam produces is very
Limited.Another kind of method is on the premise of ensureing stamping parts quality, controls by adjusting the position of blank weld line
The drift of weld line after shaping eventually, this method is highly effective, but is all the most substantially to be determined blank weld seam by experience at present
The position of line, therefore there is no guarantee that the weld line drift control accuracy after shaping.Can fit in consideration of it, the present invention proposes one
For automobile tailor welded covering plate weld line being carried out the process optimization of reasonable Arrangement based on mesh mapping and genetic algorithm
Method, the method combines stamping simulation calculating, mesh mapping method and genetic algorithm butt welded seam wire shaped position and is optimized,
Combine to rational plate, can effectively improve the positional precision of weld line after shaping, it is ensured that forming quality, reduce drip molding
Produce the risk of defect.
Summary of the invention
The present invention comprises the steps of
Step 1: tentatively conventionally determine plate weld line shaped position, strike out for tailor welded part
Shape simulation analysis；
Step 2: design meets binder surface and the process complementary surface that Sheet Metal Forming Technology requires, will extend to process complementary surface and overstock
Form a complete weld line on drawing work model on charge level, extract the complete weld line on drawing work model,
Complete design weld line according to extracting utilizes the initial threshold position that mesh mapping method reverse weld line is corresponding on plate
Put；
Step 3: use test design method to obtain sample number with reverse weld line extreme position and design weld line hop count
Strong point；
Step 4: according to sample point experimental result, constructs response surface model, determines that optimization aim, constraints become with design
The polynomial response surface approximate function of amount；
Step 5: utilize genetic algorithm to carry out the genetic operation including selecting, intersect and make a variation, solve weld line position
The optimal solution of Parametric optimization problem；
Step 6: optimized optimal solution by weld line location parameter and obtain tailor welded plate, substitute into stamping finite element software
In calculate, inspection optimum results precision.
Further, in step 1, according to design butt welding piece model needs, weld line plane projection position determines weld line
Shaped position and hop count, carry out simulation analysis, and under ensureing forming quality premise, obtain weld line maximum position deviation is simultaneously
Mesh mapping reverse makees basis；
Further, in step 2, extract design weld line and discrete exist for dot grid mapping method Inverse seeking design weld line
Initial threshold position corresponding on plate, in conjunction with the middle weld line normal orientation that designs a model, determines hop count and the limit of weld line
Region.
Further, in step 3, reverse goes out weld line extreme position, selects suitable test design method, orthogonal experiment
Design, latin square experiment design and uniform experiment design etc., it is thus achieved that about weld line in the position sample data of each end points
Point, group of data points is combined into different weld line shaped positions.
Further, in step 4, the optimization aim of Optimized model is stamping rear product section weld line physical location
With the maximum of design attitude deviation, make maximum position deviation value minimum；Constraints is that stamping gross requires
Big reduction, maximum thicken rate and meet without cracking, ridging defect requirement, and wherein maximum reduction, maximum thicken rate bound and lead to
Cross emulation and stock material performance parameter determines；Sample number strong point simulation result matching optimization aim and the multinomial of constraints
Response surface model, concrete data model is:
F optimization aim is the minima of product section weld line maximum deviation；WiFor maximum reduction, RiFor increasing most
Thick rate；ΔmaxRepresent weld line physical location and the deviation of design attitude after shaping；I is series sample point correspondence sequence number；A, b table
It is shown as and ensures that good shaping is without the plate reduction minima ftractureed, maximum；C, d are expressed as ensureing well to shape without wrinkling plate
Material thickens rate minima, maximum；
Further, in steps of 5, Quadratic response model construction sample point design variable is used to subtract with desired value and maximum
Thin rate, maximum thicken the response surface model between rate two constraints, utilize genetic algorithm to carry out including selecting, intersecting and become
The genetic operation of different grade, selects suitable iterations to solve design corresponding during the i.e. maximum position deviation minimum of optimal result and becomes
Amount, obtains the combination of optimal plate weld line shaped position and weld line position maximum deviation minimizes.
Further, in step 6, new plate combination substitutes in finite element emulation software, product section after inspection shaping
Weld line maximum position deviation and optimum results.
Accompanying drawing explanation
Fig. 1 is the implementing procedure schematic diagram of the inventive method.
Fig. 2 is for extracting product model weld line schematic diagram.
Fig. 3 is mesh mapping method reverse plate weld line origin pole extreme position schematic diagram.
Fig. 4 is that one or more snippets weld line specifically determines mode schematic diagram.
Fig. 5 is imitative automobile door plate model reverse weld line series sample point initial position schematic diagram.
Fig. 6 is traditional approach plate different from optimization method weld line forming simulation weld line position deviation schematic diagram.
Fig. 7 traditional approach and optimization method plate weld line simulation analysis and full-scale investigation result schematic diagram table.
Fig. 8 traditional approach and optimization method plate weld line full-scale investigation result schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing and instantiation, embodiment is illustrated:
Fig. 1 is the implementing procedure schematic diagram of the inventive method.
Fig. 2 is for extracting product model weld line schematic diagram.After hole etc. is processed by tailor welded parts product design model
After supplementing binder surface process complementary surface part, total model, extracts total weld line Fig. 2 (a) including product section, and Fig. 2 (b) is weldering
Suture takes a little discrete posterior nodal point.
Fig. 3 is mesh mapping method reverse plate weld line origin pole extreme position schematic diagram.
Fig. 4 is that one or more snippets weld line specifically determines mode schematic diagram.The weld line node initial bit gone out according to reverse
Putting, two limit end points form an enclosed region in its initial normal orientation, require that according to designing a model weld line hop count can be true
Fixed different weld line shaped position.Fig. 4 (a), when designing a model and plate requirement is with single hop weld line, reflects according to grid
Penetrate reverse and go out the weld line initial several limit node location N1, N2, N3 on plate, need maximum limit position in optimization process
Put and carry out considering analysis, thus N2, N3 two limit positions, select at the node normal direction maximum limit i.e. N2 of point, now N1, N2 2 exists
Being perpendicular to normal direction and form an enclosed region with raw sheet material, the difference of end positions forms different weld lines and plate combination.
Fig. 4 (b) when design a model and plate requirement for multistage weld line time, according to mesh mapping reverse go out weld line on plate at the beginning of
Begin the several limit node location N1, N2, N3, needs segmentation to consider extreme position.Between N1 and N2 and between N1 and N3, with
Single hop weld line selects similar, but must be connected by common node on middle N1N1` line and form the multistage weldering being readily produced operation
Suture.
Fig. 5 is that case study on implementation imitates automobile door plate model reverse weld line initial position combination schematic diagram.
Fig. 6 is that case study on implementation traditional approach plate different from optimization method weld line forming simulation weld line position deviation is shown
It is intended to.At identical conditions, after traditional method arranges weld line plate forming simulation, product section weld line position deviation is maximum
Value is 15.22mm, and after optimization method determines weld line position plate forming simulation, weld line position deviation maximum is 9.63mm.
Fig. 7 case study on implementation traditional approach and optimization method plate weld line full-scale investigation result schematic diagram.According to two kinds of sides
Formula carries out full-scale investigation respectively, and traditional approach plate stamping rear product section weld line maximum position deviation in kind is
15.34mm, optimization method determines that weld line plate stamping rear product section weld line maximum position deviation in kind is
9.45mm。
Fig. 8 is case study on implementation traditional approach and optimization method plate weld line simulation analysis and full-scale investigation result schematic diagram
Table.
Case is implemented
In this article with weld line final position and design attitude maximum deviation f as optimization aim, maximum thickens rate R,
Little reduction W is that Optimizing Process Parameters constraints controls forming property good in sheet forming process, with the two of weld line
Endpoint location x1, x2 be design variable to regulate the weld line difformity position at limit area, set up Optimized model as follows:
Can show that plate occurs without the cracking defect such as wrinkling according to material mechanical parameters and engineering practical experience
Maximum thickens rate R, the maximin of minimum reduction W.Limit area by mesh mapping method reverse weld line can be true
Determine the extreme position of weld line both sides.
The plate that plate and this method optimization determine in a conventional manner carries out shock pressure experiments in kind, corresponding technological parameter bar
Under part, obtain punching press material object result optimizing target, between constraints and variable, approximate response surface model.
According to the relation between plate weld line location variable and optimization aim and constraints, structure in MATLAB software
Build cubic response face approximate model.
Maximum weld line position deviation f response surface model:
F=-8331.8+141.4x1+24.475x2-0.711x1 2-0.42x1x2+0.0396x2 2+
0.001374x1 3-0.000359x2 3+0.000478x1 2x2+0.000886x1x2 2The coefficient of determination is 0.9535, adjusts
The coefficient of determination is 0.9085.
Maximum reduction W response surface model:
R=-2444.8+85.55x1-38.29x2-0.3574x1 2-0.3594x1x2+0.4148x2 2+
3.556x10-4x1 3+1.191x10-3x1 2x2-7.57x10-5x1x2 2-8.255x10-4x2 3The coefficient of determination 0.956 is adjusted
The whole coefficient of determination 0.9361.
Maximum thickens rate W response surface model:
W=3876.4-0.8109x1-75.11x2-0.3166x1 2+0.6678x1x2+0.1484x2 2
+0.001276x1 3-0.001876x1 2x2-0.0002697x1x2 2-2.259x10-4x2 3The coefficient of determination 0.9145, adjusts
The whole coefficient of determination 0.9032.
By the coefficient of determination with adjustment coefficient of determination numerical value it may be concluded that the fitting precision of agent model is the highest, can
To meet the requirement of precision of prediction.
Utilize genetic algorithm to carry out including selecting, intersect and the genetic operation of variation etc..In this research, take population big
Little n=30, obtaining final optimization pass result through loop iteration is: weld line two-end-point position is x1=168.5mm, x2=
156mm, weld seam maximum amount of movement is 9.63mm, and maximum thickens rate 28.75%, maximum reduction 29.16%, it is seen that optimum results
Meet constraints.Technological parameter after optimizing substitutes in stamping finite element software Dynaform and is calculated
9.28mm, it is seen that the precision of optimum results is that comparison is high.
Carry out full-scale investigation the most respectively, (a) traditional approach plate stamping rear product in kind in accompanying drawing 7
Part weld line maximum position deviation is 15.34mm, and (b) is that optimization method determines weld line plate stamping rear product in kind
Part weld line maximum position deviation is 9.45mm.Full-scale investigation and emulation experiment error are all within 10%.Emulation experiment with
Full-scale investigation result shows, in process conditions such as identical pressure-pad-force, beads, part portion lacks without cracking and wrinkling shaping
On the premise of Xianing, the plate determined is arranged the most in advance the shaped position of weld line, weld line actual bit can be effectively reduced
Put the deviation with design attitude, improve the distribution of not homonymy material in model and the more disorderly conjunction that designs a model, reduce weld seam simultaneously
Line position produces the risk of cracking.
In order to improve the positional precision problem not waiting thick laser assembly solder plate weld line, the present invention proposes one and reflects based on grid
Penetrate the not uniform thickness tailor welded weld line optimization method with genetic algorithm, it is characterised in that employing following steps:
Step 1: tentatively conventionally determine plate weld line shaped position, strike out for tailor welded part
Shape simulation analysis；
Step 2: design meets binder surface and the process complementary surface that Sheet Metal Forming Technology requires, will extend to process complementary surface and overstock
Form a complete weld line on drawing work model on charge level, extract the complete weld line on drawing work model,
Complete design weld line according to extracting utilizes the initial threshold position that mesh mapping method reverse weld line is corresponding on plate
Put；
Step 3: use test design method to obtain sample number with reverse weld line extreme position and design weld line hop count
Strong point；
Step 4: according to sample point experimental result, constructs response surface model, determines that optimization aim, constraints become with design
The polynomial response surface approximate function of amount；
Step 5: utilize genetic algorithm to carry out including selecting, intersect and the genetic operation of variation etc., solve weld line position
Put the optimal solution of Parametric optimization problem；
Step 6: optimized optimal solution by weld line location parameter and obtain tailor welded plate, substitute into stamping finite element software
In calculate, inspection optimum results precision.
Plate is welded by mesh mapping, Binding experiment method for designing response surface model by this method by setting up phantom
Suture shaped position carries out technique optimization method, obtains the combination of rational plate, improves tailor welded weld line stamping rear real
Position, border and the precision of design attitude, thus improve forming property, the process optimization for tailor welded weld line provides a kind of real
Border feasibility and the method for novelty, have practice guiding action to production.
Example provided above is only the preferred embodiment of the present invention, every according to the claims in the present invention and description of the invention content
Simple equivalence change and the modification made, all should belong to the scope that patent of the present invention covers.
Claims (7)
1. a not uniform thickness tailor welded weld line optimization method, it is characterised in that use following steps:
Step 1: tentatively conventionally determine plate weld line shaped position, carries out stamping imitative for tailor welded part
True analysis；
Step 2: design meets binder surface and the process complementary surface that Sheet Metal Forming Technology requires, will extend to process complementary surface and overstock charge level
On form a complete weld line on drawing work model, extract the complete weld line on drawing work model, according to
The complete design weld line extracted utilizes the initial threshold position that mesh mapping method reverse weld line is corresponding on plate；
Step 3: initial line extreme position and design weld line hop count with the weld seam of reverse use test design method to obtain sample
Notebook data point；
Step 4: according to sample number strong point experimental result, constructs response surface model, determines that optimization aim, constraints become with design
The polynomial response surface approximate function of amount；
Step 5: utilize genetic algorithm to carry out the genetic operation including selecting, intersect and make a variation, solve weld line location parameter
The optimal solution of optimization problem；
Step 6: the optimal solution optimized by weld line location parameter obtains tailor welded plate, substitutes in stamping finite element software
Calculate, the precision of inspection optimum results.
2. as claimed in claim 1, in step 1, according to design butt welding piece model needs, weld line plane projection position determines
Weld line shaped position and hop count, carry out simulation analysis, under ensureing forming quality premise, obtains weld line maximum position deviation
Make basis for mesh mapping reverse simultaneously.
3. as claimed in claim 1, in step 2, extraction design weld line is the most discrete for dot grid mapping method Inverse seeking design
The initial threshold position that weld line is corresponding on plate, in conjunction with the middle weld line normal orientation that designs a model, determines the section of weld line
Number and limit area.
4. as claimed in claim 1, in step 3, reverse goes out weld line extreme position, selects suitable test design method,
Orthogonal, latin square experiment design and uniform experiment design, it is thus achieved that about weld line at the position sample of each end points
Notebook data point, group of data points is combined into different weld line shaped positions.
5. as claimed in claim 1, in step 4, the optimization aim of Optimized model is stamping rear product section weld line
Physical location and the maximum of design attitude deviation, make maximum position deviation value minimum；Constraints is stamping basic matter
Amount requires that maximum reduction, maximum thicken rate and meet without cracking, ridging defect requirement, and wherein maximum reduction, maximum thicken rate
Bound is determined by emulation and stock material performance parameter；Sample number strong point simulation result matching optimization aim and constraints
Polynomial response surface model, concrete data model is:
F optimization aim is the minima of product section weld line maximum deviation；WiFor maximum reduction, RiRate is thickened for maximum；
ΔmaxRepresent weld line physical location and the deviation of design attitude after shaping；I is series sample point correspondence sequence number；A, b are expressed as
Ensure that good shaping is without the plate reduction minima ftractureed, maximum；C, d are expressed as ensureing well to shape increasing without wrinkling plate
Thick rate minima, maximum.
6. as claimed in claim 1, in steps of 5, use Quadratic response model construction sample point design variable and desired value
And maximum reduction, maximum thicken the response surface model between rate two constraints, genetic algorithm is utilized to carry out including selecting, handing over
The genetic operation of fork and variation etc., selects suitable iterations to solve during the i.e. maximum position deviation minimum of optimal result corresponding
Design variable, obtain optimal plate weld line shaped position combination and weld line position maximum deviation minimize.
7. as described in claim 1-6, in step 6, new plate combination substitutes in finite element emulation software, after inspection shapes
Product section weld line maximum position deviation and optimum results.
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| CN106844924A (en) * | 2017-01-12 | 2017-06-13 | 桂林电子科技大学 | Method based on Response Surface Method and genetic algorithm optimization PCB microstrip line constructions |
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| CN107515978A (en) * | 2017-08-17 | 2017-12-26 | 广东工业大学 | The method of response surface model is built based on genetic algorithm and applies its system |
| CN109145459A (en) * | 2018-08-27 | 2019-01-04 | 中车齐齐哈尔车辆有限公司 | A kind of weld seam unit generation method and device |
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| CN106844924A (en) * | 2017-01-12 | 2017-06-13 | 桂林电子科技大学 | Method based on Response Surface Method and genetic algorithm optimization PCB microstrip line constructions |
| CN106844924B (en) * | 2017-01-12 | 2021-02-23 | 桂林电子科技大学 | Method for optimizing PCB microstrip line structure based on response surface method and genetic algorithm |
| CN107515978A (en) * | 2017-08-17 | 2017-12-26 | 广东工业大学 | The method of response surface model is built based on genetic algorithm and applies its system |
| CN107498181A (en) * | 2017-08-19 | 2017-12-22 | 浙江哈尔斯真空器皿股份有限公司 | Improve the method and its automatic welding device of metal thermos cups smooth welding joint degree |
| CN107498181B (en) * | 2017-08-19 | 2019-07-26 | 浙江哈尔斯真空器皿股份有限公司 | Improve the method and its automatic welding device of metal thermos cups smooth welding joint degree |
| CN109145459A (en) * | 2018-08-27 | 2019-01-04 | 中车齐齐哈尔车辆有限公司 | A kind of weld seam unit generation method and device |
| CN110262396A (en) * | 2019-06-04 | 2019-09-20 | 中国第一汽车股份有限公司 | A kind of not equal area Bu Dengliaohou process data processing method for expecting thick product drawing die of laser assembly solder |
| CN111639406A (en) * | 2020-06-01 | 2020-09-08 | 湖南大学 | Method for optimizing shape of time sequence flanging tool knife edge |
| CN111639406B (en) * | 2020-06-01 | 2022-08-16 | 湖南大学 | Method for optimizing shape of time sequence flanging tool knife edge |
| CN115255704A (en) * | 2022-06-13 | 2022-11-01 | 中国第一汽车股份有限公司 | Process optimization method for crack of tailor-welded joint of tailor-welded blank stamped parts with different thicknesses |
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