CN105893661A - Multiple-station-progressive mold base-body structure topology optimization method - Google Patents
Multiple-station-progressive mold base-body structure topology optimization method Download PDFInfo
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses a multiple-station-progressive mold base-body structure topology optimization method. The multiple-station-progressive mold base-body structure topology optimization method includes the steps that 1, an optimization area of a base body is determined according to structural elements of a convex-concave mold outside a mold base body; 2, separation processes are subjected to numerical simulation with the finite element analysis method to obtain stress of a mold in the punching process; 3, the mold base-body structure is subjected to topology optimization based on the variable density method, the mold stress in the step 2 serves as the boundary condition of force to be mapped into a topology-optimization finite element model, finite-element simulation is designed through topology optimization with the fact that the mold structure is allowed to be deformed as the optimization constraint condition, the different cell density values are selected to be compared, and the optimization result is determined according to the maximum optimization benefit index; 4, according to the optimization result, the mold base body is designed, and whether the designed mold meets the deformation constraint condition or not is tested. By means of the multiple-station-progressive mold base-body structure topology optimization method, the structural rigidity of the mold can be effectively improved, the quality of a punching piece is more stable, and meanwhile the lightweight effect of the mold is achieved accordingly.
Description
Technical field
The present invention relates to mechanical engineering plastic processing method and mould applications, particularly relate to a kind of multistation level
Progressive die mould precursor structure Topology Optimization Method.
Background technology
Mould parent refers to the structure outside working part (punch-die, blank holder etc.).Mould parent accounts for
The ratio of mould gross mass is up to more than 80%, and traditional mould precursor structure is mainly designed to by virtue of experience,
Lack scientific theory to instruct.In order to ensure the intensity and toughness of mould structure, mould precursor structure size value
Bigger than normal, safety coefficient is relatively big, but increases mould structure volume and might not be effectively improved punching press matter
The stability of amount, volume increases the raising that will also result in production cost, and energy when increasing punch press work disappears
Consumption.
Particularly with high-accuracy multi-station progressive die, the deflection that in punching course, mould structure produces liquidates
The forming quality of casting die can produce material impact, and for the station that required precision is high, traditional moulds structure is not
Can guarantee that it has enough rigidity.Bigger mould structure deformation will cause stamping parts quality unstable,
Repeatedly repair a die, extend the manufacturing cycle of mould.
Summary of the invention
It is an object of the invention to overcome the shortcoming and defect of above-mentioned prior art, it is provided that a kind of multistation level
Progressive die mould precursor structure Topology Optimization Method.Improve mold stiffness and the stability of stamping parts stamping quality,
Reduce the mould structure deformation impact on stamping parts quality, reduce the number of times that repairs a die, alleviate mold weight, contracting
Short mould manufacturing cycle, reduces processing cost.
The present invention is achieved through the following technical solutions:
A kind of multi-station progressive die mould precursor structure Topology Optimization Method, comprises the steps:
Step (1): (include punch-die, fork truck position, blanking according to the structural element beyond mould parent
Groove etc.), the optimization region of mould parent is designed, determines the optimization region of mould parent；
Step (2): use finite element method that stamping procedure is carried out finite element modelling, it is thus achieved that punching press
During the contact force of mould and blank, wherein blank is set to elasticoplastic body, punch-die, blank holder etc.
Stamping tool is set to rigid body；
Step (3): set up multi-station progressive die mould precursor structure topological optimization FEM model, definition
Punch-die, mould parent etc. are elastomer, with the linear displacement (die deformation amount) of contact force application point
For response, with optimize region volume minimization (minimize and refer to: ensure mould structure deflection exist
On the premise of optimizing in restriction range, the material distribution making optimization region is more reasonable, without excess stock
Exist, it is to avoid cause waste of material, it is thus achieved that meet the minimal material distribution of constraints, i.e. volume is minimum
Change) it is optimization aim, retrain with the allowed band of malformation for optimizing, close to optimize the unit in region
Degree is optimized variable, realizes the topological optimization of mould precursor structure based on density variable method；
Step (4): obtain the cell density cloud atlas optimizing region according to topological optimization result, by calculating
Largest optimization performance indicator determines suitable density value, designs mould precursor structure according to optimum results, and
Carry out designed mould structure deforming constraints inspection.
Above-mentioned steps (4), obtains the cell density cloud atlas of mould parent by topological optimization computing, according to
Calculating largest optimization performance indicator selects rational density value (can obtain optimization by topological optimization computing
The cell density cloud atlas in region, the corresponding different material distribution of different density values, different close by contrast
The optimization performance indicator selection density value that angle value is corresponding, optimizes performance indicator the biggest, shows this density value pair
The material distribution answered more tends to reasonable), determine optimum results, complete mould with reference to cell distribution now female
The design of body structure.
Above-mentioned steps (3), need to define topological optimization three elements during building topology optimized FEMs model, bag
Include optimization aim, optimized variable and optimization constraint；When optimization aim is to meet optimization constraint, optimize region
Material reasonable layout, realize optimize region volume minimization；Optimized variable is the unit optimizing region
Density；Optimize constraint and be the permission deflection of mould structure.
Above-mentioned steps (2), uses finite element method (Dynaform) to shape drawing, bending etc.
Operation carries out numerical simulation, increases * DATABASE_NCFORC in * .dyn (post processing file) file
Statement (keyed file), it is thus achieved that mould and the contact force of blank；Based on Deform-3D (finite element fraction
Analysis software) separation circuit such as punching, stamping-out is carried out numerical simulation, it is thus achieved that mould and base in punching course
The contact force file (* .KEY) of material, wherein blank is set to elasticoplastic body, and punch-die, blank holder etc. rush
Pressure instrument is set to rigid body；Then by load map, contact force is loaded onto as the boundary condition of power
In topological optimization FEM model.
In order to reflect influencing each other between structure loss of weight and two kinds of factors of the rigidity of structure, close at selected unit
Introduce during angle value and optimize performance indicator formula, it may be assumed that
Definition structure optimizes volume ratio Vfrac=V/V0, wherein V0Initial for mould prototype structure design space
Volume, V be optimize after the volume of structure.Optimize volume ratio VfracThen represent structure loss of weight situation, Vfrac
The least expression structure weight loss effect is the best.Definition structure optimizes deflection and compares Sfrac=S/S0, wherein S0For
Original structure initial deformation amount, S be optimize after the deflection of structure, SfracThe least expression malformation is the least.
Optimize performance indicator OPT the biggest, show to optimize the structure obtained the most reasonable.
The present invention, relative to prior art, has such advantages as and effect:
(1) present invention is based on numerical simulation method, can carry out progressive die mould structure in advance
Force analysis and topology optimization design, it is possible to the more elastic deformation amount of Accurate Prediction mould structure.
(2) the multi-station progressive die mould structure Topology Optimization Method that the present invention uses, it is possible to be effectively improved
Mould structure rigidity, reduces mould structure elastic deformation amount, so that the quality of stamping parts is more stable.
Meanwhile, the utilization rate of material can be improved, effectively reduce the volume and weight of mould, reach light-weighted
Effect.
Accompanying drawing explanation
Fig. 1 is progressive die mould precursor structure topology optimization design flow chart
Fig. 2 is that certain multi-station progressive die lower mold can optimize region
The optimization benefit value that cell density value that Fig. 3 is different is corresponding
Fig. 4 is lower mold feet structure after optimization
Fig. 5 is that certain multi-station progressive die upper mold can optimize region
Fig. 6 is upper mold feet structure after optimization
In upper figure: 1 feet (can optimize region)；2 lower mold die holders；3 lower mold feets；4 upper mold feets
Region can be optimized；5 upper mold die holders；6 upper mold feets
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
As shown in Figures 1 to 6.The invention discloses a kind of multi-station progressive die mould precursor structure topology excellent
Change method.
Fig. 1 show the flow chart of multi-station progressive die mould precursor structure topology optimization design.
Be broadly divided into following steps: 1, according to part, fork truck positions such as the punch-dies beyond mould parent, fall
The structural elements such as hopper, determine the optimization region of parent；2, use finite element method that drawing etc. is become
The separation circuits such as shape operation, stamping-out carry out numerical simulation, it is thus achieved that the stress of mould in punching course, wherein
Blank is set to elasticoplastic body, and the stamping tool such as punch-die, blank holder is set to rigid body；3, based on change
Densimetry carries out topological optimization to mould precursor structure, arranges punch-die, mould parent etc. for elastomer,
Mould stress in step 2 is mapped in topological optimization FEM model as the boundary condition of power, with
Mould structure allows to be deformed into optimization constraints and carries out topology optimization design finite element modelling, selects difference
Cell density value compare, determine optimum results according to largest optimization performance indicator；4, according to optimization
Mould parent is designed by result and whether the mould of inspection institute's design meets deformation constraints.This
Bright can be effectively improved mould structure rigidity, the quality making stamping parts is more stable.Meanwhile, mould is made to reach
To light-weighted effect.
Illustrate multi-station progressive die mould precursor structure topological optimization side of the present invention by the following examples
Method.
1) lower mold mould precursor structure topological optimization
Use the multi-station progressive die mould precursor structure Topology Optimization Method that the present invention proposes, grading to this
Mould lower mold mould precursor structure is optimized design.First it is parent can be optimized space be designed, as
Shown in Fig. 2, determine that parent can optimize space.Then, based on FInite Element be respectively adopted Dynaform,
Deform-3D carries out numerical simulation, the definition punching such as punch-die, blank holder to forming process and separation circuit
Pressure instrument is rigid body, and blank is elasticoplastic body, it is thus achieved that mould and the contact force of plate in each stamping procedure.
Then, topological optimization three elements are defined: optimization aim, optimized variable, optimization retrain, to optimize region
Volume minimization be optimization aim, with optimize region cell density as optimized variable, to contact masterpiece
By the linear displacement (elastic deformation amount) of point for optimizing constraints, i.e. ensure that maximum linear displacement does not surpasses
Cross a certain limit value.Limit maximum linear displacement a little in this embodiment less than 0.1mm.?
Hyperworks sets up mould precursor structure topological optimization FEM model, and using contact force as border
Condition maps on topological optimization FEM model, obtains topological optimization result by interative computation.Optimize
The constant interval of variable (cell density value) is 0～1, select cell density value more than 0.1 respectively, 0.2,
0.3,0.4 time cell distribution contrast, and calculate the optimization benefit value of its correspondence, according to cell density
More than 0.10, after 0.20,0.30,0.40 design the optimization benefit value of structure be respectively 1.5608,1.5049,
1.5322,1.4934, as shown in Figure 3.Optimization performance indicator when visible element density is more than 0.1 is optimal,
Therefore, lower mold feet structure chooses cell density more than 0.10 as the most reasonable with reference to carrying out structure design.
Fig. 4 show by cell density more than the 0.10 lower mold parent being designed (i.e. feet) structure,
There are 9 feets.This mold was originally the most empirically designed, and needed 11 feets, before i.e. optimizing
Rear respectively 11 and 9 feets.Contact force required for applying both structures respectively, is optimized
Maximum deformation quantity front and back is respectively 0.082mm and 0.077mm, is satisfied by maximum distortion less than 0.1mm
Deformation constraints, and with optimize before compared with, after optimization, deflection reduces 6.1%, weight saving
13.2%.
2) upper die mold precursor structure topological optimization
First be upper mold parent can be optimized space be designed, owing to being upper mold, do not exist charging conduit and
Fork truck position, as long as therefore according to the installation requirements of punch-die, can not optimize after region determines and remove,
It is that mould parent can optimize space, as shown in Figure 5.Then according to the step of a upper embodiment is opened up
Flutter optimization (optimize constraint and be still limited the maximum linear displacement pinpointed less than 0.1mm), contrast cell density value
More than 0.10,0.20,0.30,0.40 time cell distribution, and again by optimize performance indicator carry out
Calculate, choose and optimize the performance indicator optimal cell density situation more than 0.10 as depending on that structure designs
According to.
Fig. 6 show according to cell density more than the 0.10 lower mold parent being designed (i.e. feet) structure,
There are 8 feets.This mold was originally the most empirically designed, and needed 11 feets, before i.e. optimizing
Rear respectively 11 and 8 feets.Contact force required for applying both structures respectively, simulation calculates
Maximum deformation quantity before and after being optimized is of substantially equal, be satisfied by deform constraints, but with optimize before phase
Ratio, weight saving after optimization 26.6%.
As it has been described above, just can preferably realize the present invention.
Embodiments of the present invention are also not restricted to the described embodiments, and other are any without departing from the present invention's
The change made under Spirit Essence and principle, modify, substitute, combine, simplify, all should be putting of equivalence
Change mode, within being included in protection scope of the present invention.
Claims (5)
1. a multi-station progressive die mould precursor structure Topology Optimization Method, it is characterised in that include as follows
Step:
Step (1): according to the structural element beyond mould parent, the optimization region of mould parent is carried out
Design, determines the optimization region of mould parent；
Step (2): use finite element method that stamping procedure is carried out finite element modelling, it is thus achieved that punching press
During the contact force of mould and blank, wherein blank is set to elasticoplastic body, and punch-die, blank holder set
It is set to rigid body；
Step (3): set up multi-station progressive die mould precursor structure topological optimization FEM model, definition
Punch-die, mould parent are elastomer, with the linear displacement of contact force application point for response, to optimize district
The volume in territory is optimization aim, retrains, to optimize the list in region with the allowed band of malformation for optimizing
Unit's density is optimized variable, realizes the topological optimization of mould precursor structure based on density variable method；
Step (4): obtain the cell density cloud atlas optimizing region according to topological optimization result, by calculating
Largest optimization performance indicator determines suitable density value, designs mould precursor structure according to optimum results, and
Carry out designed mould structure deforming constraints inspection.
The most according to claim 1, multi-station progressive die mould precursor structure Topology Optimization Method, it is special
Levy and be: step (4), obtained the cell density cloud atlas of mould parent by topological optimization computing, according to
Calculate largest optimization performance indicator and select density value, determine optimum results, complete with reference to cell distribution now
Become the design of mould precursor structure.
The most according to claim 1, multi-station progressive die mould precursor structure Topology Optimization Method, it is special
Levy and be: step (3), topological optimization three elements during building topology optimized FEMs model, need to be defined, bag
Include optimization aim, optimized variable and optimization constraint；When optimization aim is to meet optimization constraint, optimize region
Material reasonable layout, realize optimize region volume minimization；Optimized variable is the unit optimizing region
Density；Optimize constraint and be the permission deflection of mould structure.
The most according to claim 1, multi-station progressive die mould precursor structure Topology Optimization Method, it is special
Levy and be: step (2), use finite element software Dynaform, Deform-3D respectively to shaping and dividing
Numerical simulation is carried out, by increasing * DATABASE_NCFORC statement in * .dyn file from operation
And * .KEY file, it is thus achieved that mould and the contact force of blank；Wherein blank is set to elasticoplastic body, convex-concave
Mould, blank holder are set to rigid body；Then by load map, contact force is added as the boundary condition of power
It is loaded onto in topological optimization FEM model.
Multi-station progressive die mould precursor structure Topology Optimization Method the most according to claim 2, its
It is characterised by:
In order to reflect influencing each other between structure loss of weight and two kinds of factors of the rigidity of structure, close at selected unit
Introduce during angle value and optimize performance indicator formula, it may be assumed that
Definition structure optimizes volume ratio Vfrac=V/V0, wherein V0Initial for mould prototype structure design space
Volume, V be optimize after the volume of structure；Optimize volume ratio VfracThen represent structure loss of weight situation, Vfrac
The least expression structure weight loss effect is the best；Definition structure optimizes deflection and compares Sfrac=S/S0, wherein S0For
Original structure initial deformation amount, S be optimize after the deflection of structure, SfracThe least expression malformation is the least；
Optimize performance indicator OPT the biggest, show to optimize the structure obtained the most reasonable.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009381A (en) * | 2017-12-25 | 2018-05-08 | 北京航空航天大学 | A kind of Continuum Structure reliability Topology Optimization Method under displacement and global stress mixed constraints |
| CN108171731A (en) * | 2017-09-28 | 2018-06-15 | 中国矿业大学(北京) | A kind of automatic preferred method of minimum image set for taking the more element constraints of topological geometry into account |
| CN108256215A (en) * | 2018-01-15 | 2018-07-06 | 广东省智能制造研究所 | A kind of gantry machining center ram and its optimum design method based on structural Topology Optimization |
| CN108629086A (en) * | 2018-04-12 | 2018-10-09 | 华中科技大学 | A kind of Stress relief method suitable for increasing material manufacturing part |
| CN109583078A (en) * | 2018-11-27 | 2019-04-05 | 上海交通大学 | Contact force automatic loading method |
| CN111054829A (en) * | 2019-11-11 | 2020-04-24 | 泊头市金键模具有限责任公司 | Die surface thinning method of stamping die |
| CN111539145A (en) * | 2020-04-22 | 2020-08-14 | 安徽工程大学 | Optimization method of compression molding die for automobile hat rack |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108171731A (en) * | 2017-09-28 | 2018-06-15 | 中国矿业大学(北京) | A kind of automatic preferred method of minimum image set for taking the more element constraints of topological geometry into account |
| CN108171731B (en) * | 2017-09-28 | 2021-12-14 | 中国矿业大学(北京) | Minimum image set automatic optimization method considering topological geometry multi-element constraint |
| CN108009381A (en) * | 2017-12-25 | 2018-05-08 | 北京航空航天大学 | A kind of Continuum Structure reliability Topology Optimization Method under displacement and global stress mixed constraints |
| CN108009381B (en) * | 2017-12-25 | 2021-05-25 | 北京航空航天大学 | Continuum structure reliability topological optimization method under mixed constraint of displacement and global stress |
| CN108256215A (en) * | 2018-01-15 | 2018-07-06 | 广东省智能制造研究所 | A kind of gantry machining center ram and its optimum design method based on structural Topology Optimization |
| CN108629086A (en) * | 2018-04-12 | 2018-10-09 | 华中科技大学 | A kind of Stress relief method suitable for increasing material manufacturing part |
| CN108629086B (en) * | 2018-04-12 | 2020-06-02 | 华中科技大学 | Stress adjusting method suitable for additive manufacturing part |
| CN109583078A (en) * | 2018-11-27 | 2019-04-05 | 上海交通大学 | Contact force automatic loading method |
| CN111054829A (en) * | 2019-11-11 | 2020-04-24 | 泊头市金键模具有限责任公司 | Die surface thinning method of stamping die |
| CN111054829B (en) * | 2019-11-11 | 2022-07-22 | 泊头市金键模具有限责任公司 | Die surface refining method of stamping die |
| CN111539145A (en) * | 2020-04-22 | 2020-08-14 | 安徽工程大学 | Optimization method of compression molding die for automobile hat rack |
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