CN106980742A - A kind of load projection mapping method that punch forming information is introduced to limit element artificial module - Google Patents
A kind of load projection mapping method that punch forming information is introduced to limit element artificial module Download PDFInfo
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Abstract
The invention discloses a kind of load projection mapping method that punch forming information is introduced to limit element artificial module, comprise the following steps：By the node force information of stamping middle plate, positioning projection is mapped on die face grid twice；Load information on die face grid is transferred on mould tetrahedron element, realizes and the node active force of plate is applied directly on mould to replace effect of the plate to mould.It the method achieve the transmission of power between plate and mould in punch forming, there is important theory directive significance and application value to the analysis of automobile stamping forming die structure, it belongs to automobile technical field, the problem of how it is solved in the prior art fast and accurately by sheet metal forming information projection mapping to limit element artificial module, realizes the load projection mapping between different grid model node active forces.
Description
Technical field
The invention belongs to punch forming technical field, more particularly to one kind punch forming letter is introduced to limit element artificial module
The load projection mapping method of breath.
Background technology
With increasingly being paid attention in terms of the feature of environmental protection, security and comfortableness of automobile, automotive light weight technology is increasingly becoming
The new trend of automobile industry development.However, light-weighted requirement makes the performance more and more higher of Body Steel Plate material, high strength steel
Plate is also more and more extensive in the application of vehicle body.However, the application of high-strength steel sheet brings a series of problems to punching production：It is high-strength
Spend steel plate formability is poor, resilience seriously, the insufficient rigidity of diel, design problem become increasingly complex and design parameter
It is on the increase, difficult influence manufacturing schedule of diel installation and debugging modification etc..Traditional low-intensity steel plate stamping Die Design is accurate
Then, specification can no longer meet the requirement of high-strength steel sheet stamping Die Design.The simple volume and thickness for increasing mould simply,
From the higher mold materials of hardness, the energy consumption in mold materials cost and production is added, and can not play and carry sometimes
The effect of high mould safety coefficient.Therefore, for the punching press loading characteristic of high-strength steel sheet, it is badly in need of a kind of analysis side of quantification
Method carries out intensity and toughness check, life prediction and further structural optimization analysis to diel, sets up new mould knot
Configuration formula, standard and Fatigue Life Assessment standard.
Traditional mould structure design method, mainly designer are according to the experience and conventional phase of Mould Enterprise designer
Designed like mould structure formation, be theoretically unsound to assess the quality of mould structure design, and to die structure analysis and
Influence concern of the die deformation amount to shaping is seldom.Some domestic and international scholars utilize finite element analysis technology, are signed an undertaking in stamping die
Studied in terms of structure analysis, their research method can offer reference for the optimization design of punching die structure.
Becchio etc. analyzes the stressing conditions of diel using finite element method first, analyzes drawing die entirety
Stress situation and deformation are distributed, and include some applications for carrying out punching mould structure analysis, and the Keum of South Korea etc. uses finite element
Analytical technology analyzes the elastic deformation of mould and press, and studies Die Elastic Deformation by coupling shaping and structural analysis
Influence to punching press part forming.At home, Sun Chengzhi of Shanghai Automotive Industry (group) company car engineering research institute etc.
Diel blank holder stressing conditions are obtained by experiment, and blank holder stress distribution situation has been tried to achieve using numerical simulation,
As a result show that the result that the stress distribution trend of simulation is drawn with experiment is more coincide.The Liu Dihui of Hunan University have studied one kind
Grid variable mappings algorithm for simulating car collision, it is believed that among vehicle collision simulation analysis, it is contemplated that part is rushed
Sheet thickness change, the influence of material hardening and residual stress to simulation result after pressure；Zeng Peng, Zhu of Shanghai Communications University
The flat influence research that have studied punch forming history to vehicle body typical structure crash-worthiness, using the step based on total theory of plasticity
Journal of Sex Research is formed to the typical cap-shaped structure of vehicle body in the method for forming, and shaping history is analyzed to hat by emulation and Experimental Comparison
The influence of Structural Crashworthiness.The Hu equality of Jilin University, using the efficient quickly inverse shaping finite element analysis side of independent development
Method and mesh mapping technology, it is proposed that introduce technological factor, ensure the design cycle again, improve the body of a motor car of collision simulation precision
And the fine simulating analysis of part.However, application of the grid variable load mapping method among die structure analysis, research
Scholar compare it is less.
In face of Press Tools for Automobiles present situation with keen competition, shorten the design cycle of product, lift designing quality, reduce mould
Tool cost has very important significance.Therefore, in the urgent need to introducing new meter in Press Tools for Automobiles structured design process
Calculation method, lifts the analysis precision of labyrinth, and then realizes the optimization design of structural parameters.Numerous scholars enter to computational methods
Research is gone, has found computational accuracy and the higher algorithm of efficiency, obtained many achievements, but still there are more problem values to obtain further
Explore.
The content of the invention
The invention provides a kind of load projection mapping method that punch forming information is introduced to limit element artificial module, purport
The problem of how solving in the prior art fast and accurately by sheet metal forming information transmission to limit element artificial module,
The transmission between different grid model node active forces is realized, so as to reach raising mould structure finite element analysis precision, reduction
Model solution scale, the purpose for realizing Optimizing die structure.
In order to solve the above technical problems, the load provided by the present invention that punch forming information is introduced to limit element artificial module
Lotus projection mapping method, comprises the following steps：
(1) plate nodal information is extracted, the product digital-to-analogue provided according to product department, product type face is extracted, by product type face
It imported into analysis of sheet metal forming software and being formed property of plate is analyzed, and the extraction plate nodal information from analysis result；
(2) die face mesh node information is extracted, and craft type face is set up according to above-mentioned analysis of sheet metal forming result, according to
Mould CAD threedimensional model is set up in craft type face, extracts Mould CAD threedimensional model type face, and Mould CAD threedimensional model type face is led
Enter into Hyperworks to carry out mesh generation, obtain the type surface grids nodal information of Mould CAD threedimensional model；
(3) the node force information of stamping middle plate is mapped to die face grid node by writing Programmed loading
On, obtain the die face mesh node information after load map；
(4) the die face mesh node information after the load map that will be obtained in step (3) is imported in Hyperworks,
Using the die face grid node masterpiece after load map as force boundary condition, mould FEM model is set up, to mould structure
Finite element analysis.
Further, the load map method in step (3) comprises the following steps：
Step 1, using ifstream file modes, read in plate nodal information after sheet-metal press working emulation；
Step 2, using ifstream file modes, read in die face mesh node information；
Step 3, the thought progress Global localization using central projection：With a certain section in plate nodal information in step (1)
Point centered on point O, given threshold value length is radius r and with pressing direction into angle theta (θ<90 °) projected, then to mould
Type surface grids node carries out global search, each node of die face grid is judged whether in view field, in view field
The unit of die face grid node construction is the unit scope of local positioning；Mould type surface grids are each in compared projections region
The vector product size of the vector that node and node O are constituted respectively with pressing direction unit vector, determines vector product in view field
The die face grid node of minimum value is the origin of coordinates of local positioning；
Step 4, local positioning carried out to die face grid node using point projection thought in the plane, by the overall situation
The origin of coordinates that positioning is determined sets up local coordinate system, and plate nodal information interior joint O is accurately located at into die face grid
In in corresponding triangular mesh unit；
Step 5, using interpolating shape functions the loading force on node O is mapped on corresponding die face grid node；
Step 6, repeat the above steps, until the loading force in plate nodal information on all nodes is all mapped to
Untill on die face grid node；
Step 7, using Ofstream outfile modes, export load map rear mold type surface grids nodal information.
Further, analysis of sheet metal forming software refers to business analysis of sheet metal forming software Autoform in step (1), production
Product need to analysis result be good in Autoform, and error or warning can not occur in its analysis result.
Further, the overall stiffness of mould is not influenceed in step (2) on the simplification of Mould CAD threedimensional model.
Further, the specific steps of local positioning include in Step 4：
A, using in Step 3 Global localization determine die face grid node as the origin of coordinates, in die face grid
Two sides of a certain triangular element A by node of the origin of coordinates are that reference axis sets up local coordinate system；
If b, node O subpoint are in triangular element A, net corresponding in die face grid node O
Lattice unit is triangular element A；If node O subpoint is not in triangular element A, in die face grid with
The origin of coordinates is that two sides of another triangular element of node are that reference axis sets up local coordinate system, rejudges node O's
Whether projection is in selected triangular element, untill node O grid cells corresponding in die face grid are found.
The present invention is by being accurately positioned between two sets of different grid cells, by punching press plate grid cell and die face
Establish a kind of corresponding relation between grid cell, build plastic force and die face grid node on plate cell node it
Between load map relational model, sheet forming power is more accurately delivered on die face, thus improve simulation calculation essence
Degree；In the analysis that this method is applied to mould structure, the load suffered by mold portions can be accurately calculated, can be more preferable
The Structural Analysis Models such as intensity, fatigue are met, the lightweight of mould is realized.
Compared with prior art, this method has advantages below:
1st, by the plastic force accurate transfer in sheet forming numerical analysis to die face grid node, it is used as mould knot
The boundary condition of structure analysis, structural optimization analysis is carried out to mould, can rational modification mould carrying precursor structure so that mould is female
Body, which reaches, to be met stiffness requirement and realizes light-weighted purpose.
2nd, sheet metal forming numerical simulation and die structure analysis numerical simulation are expressed using two nested grids, can be according to difference
Requirement of the process to grid rationally carries out mesh generation, and the contradiction between solving precision and scale of model is solved well；With
The interaction force between plate and mould is deformed instead of contact coupling complicated between them, is more truly reflecting mould
On the premise of having stress, it enormously simplify the complexity of problem and significantly reduce the solution scale of model, and the method can be pushed away
Extensively arrive other application field.
In summary, a kind of load map side that punch forming information is introduced to limit element artificial module in the present invention
Method, realizes the transmission of power between plate and mould, has important theory to improving the analysis of stamping forming die for automotive lamps structure
Directive significance and application value.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the present invention；
Fig. 2 is the three-dimensional modeling structural representation of floor side member in the embodiment of the present invention；
Fig. 3 is load map directional diagram；
Fig. 4 is Global localization figure；
Fig. 5 is local positioning figure；
Fig. 6 is the interpolation calculation figure of load；
Fig. 7 is load map method flow diagram.
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.
As shown in figs. 1-7, the load provided by the present invention for introducing punch forming information to limit element artificial module is projected
Mapping method, comprises the following steps：
(1) plate nodal information is extracted：Using Autoform as numerical simulation platform, the product number provided according to product department
Mould, is extracted product type face (upper and lower type benchmark), product type face is imported into Autoform being formed property of plate is analyzed,
Judge whether product there are formability problems (the problems such as such as drawing crack, corrugation) according to analysis result, as fruit product has formability to ask
Topic then proposes that product change is required to product, and then new product is analyzed again according to feedback, until no formability problems,
It is not required to carry product change requirement if fruit product does not have formability problems；Obtain the punching press model of no forming defects, and from point
Analyse and plate nodal information (node coordinate, unit, nodal force) is extracted in result；Analysis result can not occur error or
Warning, plate nodal information is exported with af forms, and af files are opened in Excel is saved as dat formatted files and made
For plate nodal information source file 1；
(2) die face mesh node information is extracted：Craft type face, root are set up according to sheet forming result in Autoform
Mould CAD threedimensional model is set up according to craft type face, and Rational Simplification is carried out to it, but to the simplification of Mould CAD threedimensional model
The overall stiffness of mould is not influenceed；Mould CAD threedimensional model type face is extracted, and Mould CAD threedimensional model type face is imported into
Mesh generation is carried out in Hyperworks, Mould CAD threedimensional model type surface grids nodal information (node coordinate, unit) is obtained,
Mould CAD threedimensional model type surface grids nodal information is saved as into dat files as die face gridding information source file 2；
(3) the node force information of stamping middle plate is mapped to die face grid node by writing Programmed loading
On：
Step 1, using ifstream file modes, read in plate nodal information source file 1 after sheet-metal press working emulation；
Step 2, using ifstream file modes, read in die face gridding information source file 2；
Step 3, the thought progress Global localization using central projection：Centered on a certain node O in plate nodal information
Point, given threshold value length is radius r and with pressing direction into angle theta (θ<90 °) projected, then to die face grid section
Point carries out global search, judge die face grid each node whether in view field (if there is no view field, then
Think that the plate node is invalid), the unit of die face joint structure is the unit scope of local positioning in view field；Than
The vectorial vector product respectively with pressing direction unit vector constituted compared with each node of mould type surface grids in view field and node O
Size, the die face grid node for determining vector product minimum value in view field is the origin of coordinates of local positioning；
Step 4, local positioning carried out to die face grid node using point projection thought in the plane, by the overall situation
The origin of coordinates that positioning is determined sets up local coordinate system, and node O is accurately located at corresponding three in die face grid
In hexagonal lattice unit；
Step 5, the loading force on node O is mapped to corresponding die face grid three using interpolating shape functions
On corner shaped elements node, the transmission of the load variate-value between grid model is realized；
Step 6, repeat the above steps, until the loading force in plate nodal information on all nodes is all mapped to
Untill on die face grid node, plate interstitial content is more than die face grid node number after sheet-metal press working is emulated
When, it is understood that there may be multiple plate nodes correspond in same die face triangular mesh, now to mapping rear mold type veil
Loading force on lattice node is averaged；
Step 7, using Ofstream outfile modes, the power of each node, obtains institute on export die face grid
The load output file 3 needed；
(4) load output file 3 is read in Hyperworks, by the die face grid node masterpiece after load map
For force boundary condition, mould FEM model is set up, structure is carried out to mould using Optistruct modules in Hyperworks
Analysis and post processing.
As shown in figure 5, the specific steps of local positioning include in Step 4：
A, using in Step 3 Global localization determine die face grid node as the origin of coordinates, in die face grid
Two sides of a certain triangular element A by node of the origin of coordinates are that reference axis sets up local coordinate system；
If b, punching press model node O subpoint are in triangular element A, punching press model node O is in die face
Upper corresponding grid cell is triangular element A；If the subpoint of O points is not in triangular element A, in mould type
Two sides of another triangular element in surface grids by node of the origin of coordinates are that reference axis sets up local coordinate system, are sentenced again
Whether disconnected punching press model node O projection is in selected triangular element, until finding punching press model node O on die face
Untill corresponding grid cell.
Mapping method will be elaborated using automobile longeron as research object below：
Fig. 2 is the three-dimensional modeling structural representation of certain longeron, chooses to enter at local shape A according to the geometry of floor side member
Row analysis；
As shown in figure 4, carrying out Global localization using the thought of central projection, that is, set a certain node O in plate nodal information
Centered on point, using given threshold value length as radius r and with pressing direction angle theta (θ<90 °) projected, then to die face
Each node of grid carries out global search, judges each node of die face grid whether in view field, view field's internal model
The unit of tool type face joint structure be in the unit scope of local positioning, compared projections region each node of mould type surface grids and
The vector product size of the vector that node O is constituted respectively with pressing direction unit vector, determines vector product minimum value in view field
Die face grid node be local positioning the origin of coordinates；Tetra- nodes of M6, M7, M10, M11 are in view field in Fig. 4
It is interior, compare OM6 and punching press in OM6, OM7, OM10, OM11 vector and the size of pressing direction unit vector e0 vector product, figure
Direction unit vector e0 vector product is minimum, i.e., M6 nodes are local coordinate origin；
As shown in figure 5, local positioning is carried out to die face grid node using the projection thought of point in the plane, to mould
Tool type surface grids triangular element E8 is analyzed, and the M6 nodes determined using Global localization is local coordinate system origin, sides
M6M11, side M6M7 are respectively that u, v coordinate axle set up local coordinate system, and summit can be expressed as the triangle τ of { M6, M7, M11 }
U1=M11-M6, v2=M7-M6 in parametric form τ (s, t)=M6+su1+tv2 formulas, (s, t) ∈ D=(s, t) | s ∈ [0,1],
T ∈ [0,1], s+t≤1 }, s herein, t is parameter, equivalent to x, and y is the same, and u1, v2 are vector；Judge Fig. 4 interior joints O in plane
M6M7M11 subpoint, if node O subpoint is in triangular element M6M7M11, node O is in die face grid
Upper corresponding grid cell is E8, if the subpoint of O points is not in triangular element E8, using M6 nodes as local coordinate
It is that origin re-establishes local coordinate system, rejudges projections of the node O in remaining element E1, E4, E5, E7, E11, until
Untill finding node O grid cells corresponding in die face grid；
As shown in fig. 6, the loading force on sheet forming triangular element node is mapped into mould using interpolating shape functions
On type surface grids triangular element；If three node Ms 6 of certain triangular mesh, M7, M11 interpolation shape letter in die face grid
Number respectively N1, N2, N3, wherein：
N2=s1 can similarly be obtained；
N1=1-N2-N3=1-s1-t1
Wherein, e1, e2, e3 represent vector, s1, t1 be parameter, (s1, t1) ∈ D=(s1, t1) | s1 ∈ [0,1], t1 ∈
[0,1],s1+t1≤1}；
It can be seen that, interpolating shape functions are exactly node O coordinate value, when obtaining in triangle to the closest point of spatial point
After coordinate, interpolating function of this in corresponding triangle is also determined that；
If load of the plate nodal information interior joint O point of load under the global coordinate system of space be Fo=(Fox, Foy,
Foz), the load is moved on the triangle of tri- node compositions of mould triangular mesh M6, M7, M11, and mobile target point exists
It is respectively N1, N2, N3 to the interpolating shape functions of three nodes in triangle, is interpolated into the load difference on three nodes
P1=(P1x, P1y, P1z), P2=(P2x, P2y, P2z), P3=(P3x, P3y, P3z) are designated as,
The mapping of remaining plate nodal force can similarly be obtained.
The present invention is directed to high-strength steel plate stamping and forming process, have studied a kind of new grid variable load projection mapping side
Method, this method proposes the load projection mapping computational methods between a kind of two sets of different mesh triangles shape units, to improving automobile
Finite element analysis precision has important theory directive significance and application value with Die Structure Optimization.
Claims (6)
1. a kind of load projection mapping method that punch forming information is introduced to limit element artificial module, it is characterised in that：Including
Following steps：
(1) plate nodal information is extracted, the product digital-to-analogue provided according to product department, extracts product type face, product type face is imported
Being formed property of plate is analyzed into analysis of sheet metal forming software, and the extraction plate nodal information from analysis result；
(2) die face mesh node information is extracted, and craft type face is set up according to above-mentioned analysis of sheet metal forming result, according to technique
Mould CAD threedimensional model is set up in type face, extracts Mould CAD threedimensional model type face, and Mould CAD threedimensional model type face is imported into
Mesh generation is carried out in Hyperworks, the type surface grids nodal information of Mould CAD threedimensional model is obtained；
(3) the node force information of stamping middle plate is mapped on die face grid node by writing Programmed loading,
Obtain the die face mesh node information after load map；
(4) the die face mesh node information after the load map that will be obtained in step (3) is imported in Hyperworks, to carry
Die face grid node masterpiece after lotus mapping is force boundary condition, sets up mould FEM model, limited to mould structure
Meta analysis.
2. the load projection mapping method according to claim 1 that punch forming information is introduced to limit element artificial module,
It is characterized in that：Load map in step (3) is achieved by the steps of：
Step1, using ifstream file modes, read in plate nodal information after sheet-metal press working emulation；
Step2, using ifstream file modes, read in die face mesh node information；
Step3, the thought progress Global localization using central projection：The a certain node O using in plate nodal information in step (1) as
Central point, given threshold value length is radius r and with pressing direction into angle theta (θ<90 °) projected, then to mould type veil
Lattice node carries out global search, judges each node of die face grid whether in view field, mould type in view field
The unit of surface grids joint structure is the unit scope of local positioning；In compared projections region each node of mould type surface grids and
The vector product size of the vector that node O is constituted respectively with pressing direction unit vector, determines vector product minimum value in view field
Die face grid node be local positioning the origin of coordinates；
Step4, local positioning carried out to die face grid node using point projection thought in the plane, it is true by Global localization
The fixed origin of coordinates sets up local coordinate system, and plate nodal information interior joint O is accurately located in die face grid and it
In corresponding triangular mesh unit；
Step5, the loading force on node O is mapped on corresponding die face grid node using interpolating shape functions；
Step6, repeat the above steps, until the loading force in plate nodal information on all nodes is all mapped into mould type
Untill on surface grids node；
Step7, using Ofstream outfile modes, export load map rear mold type surface grids nodal information.
3. the load projection mapping method according to claim 1 that punch forming information is introduced to limit element artificial module,
It is characterized in that：Analysis of sheet metal forming software refers to business analysis of sheet metal forming software Autoform in step (1), and product need to be
Analysis result is good in Autoform, and error or warning can not occur in its analysis result.
4. the load projection mapping method according to claim 1 that punch forming information is introduced to limit element artificial module,
It is characterized in that：The overall stiffness of mould is not influenceed in step (2) on the simplification of Mould CAD threedimensional model.
5. the load projection mapping method according to claim 2 that punch forming information is introduced to limit element artificial module,
It is characterized in that：The specific steps of local positioning include in Step4：
A, the die face grid node that Global localization is determined using in Step3 is the origins of coordinates, with seat in die face grid
Mark origin is that a certain triangular element A of node two sides are that reference axis sets up local coordinate system；
If b, node O subpoint are in triangular element A, grid list corresponding in die face grid node O
Member is triangular element A；If node O subpoint is not in triangular element A, with coordinate in die face grid
Origin is that two sides of another triangular element of node are that reference axis sets up local coordinate system, rejudges node O projection
Whether in selected triangular element, untill node O grid cells corresponding in die face grid are found.
6. the load projection mapping method according to claim 1 that punch forming information is introduced to limit element artificial module,
It is characterized in that：Structural analysis and rear place are carried out to mould using Optistruct modules in Hyperworks in step (4)
Reason.
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| CN110837707A (en) * | 2019-11-04 | 2020-02-25 | 南京麦慎数字科技有限公司 | Finite element analysis system, finite element analysis method, computer equipment and storage medium |
| CN113239592A (en) * | 2021-05-19 | 2021-08-10 | 北京航空航天大学 | Hierarchical load decomposition method for simulation application of complex multi-layer structure product |
| CN116933442A (en) * | 2023-08-15 | 2023-10-24 | 广州知元科技有限责任公司 | Stamping process simulation model modeling method and related device |
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| 刘源: "《高强度钢板冲压模具强度分析与结构优化》", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 杨旭静 等: "《载荷映射方法及其在模具结构优化中的应用》", 《湖南大学学报（自然科学版）》 * |
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|---|---|---|---|---|
| CN108856418A (en) * | 2018-05-29 | 2018-11-23 | 南京六和普什机械有限公司 | A kind of Robust Optimization method of auto parts aluminium sheet Sheet Metal Forming Technology |
| CN110837707A (en) * | 2019-11-04 | 2020-02-25 | 南京麦慎数字科技有限公司 | Finite element analysis system, finite element analysis method, computer equipment and storage medium |
| CN110837707B (en) * | 2019-11-04 | 2023-06-06 | 南京麦慎数字科技有限公司 | Finite element analysis system, method, computer equipment and storage medium |
| CN113239592A (en) * | 2021-05-19 | 2021-08-10 | 北京航空航天大学 | Hierarchical load decomposition method for simulation application of complex multi-layer structure product |
| CN113239592B (en) * | 2021-05-19 | 2022-07-01 | 北京航空航天大学 | Hierarchical load decomposition method for simulation application of complex multi-layer structure product |
| CN116933442A (en) * | 2023-08-15 | 2023-10-24 | 广州知元科技有限责任公司 | Stamping process simulation model modeling method and related device |
| CN116933442B (en) * | 2023-08-15 | 2024-02-09 | 广州知元科技有限责任公司 | Stamping process simulation model modeling method and related device |
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