CN104056968A - Die structure optimizing method taking service life into account - Google Patents
Die structure optimizing method taking service life into account Download PDFInfo
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- CN104056968A CN104056968A CN201410204461.0A CN201410204461A CN104056968A CN 104056968 A CN104056968 A CN 104056968A CN 201410204461 A CN201410204461 A CN 201410204461A CN 104056968 A CN104056968 A CN 104056968A
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Abstract
The invention discloses a die structure optimizing method taking the service life into account. Through optimizing of a high-strength die structure, stress concentration of the die structure in the punching process is effectively reduced, and the fatigue life of a die is prolonged. The die structure optimizing method provides reference for developing a high-strength steel stamping die and checking the strength of the die.
Description
Technical field
The present invention relates to provide a kind of optimization method of mould structure, belong to stamping die of automotive covering part technical field.
Background technology
Along with the development of Hyundai Motor, people have had new requirement to vehicle safety and fuel economy.Adopting advanced high-strength steel material is a good approach that improves bus body strength and reduce energy resource consumption.It is good that AHSS has formability, and intensity is high, the feature that collision energy-absorbing ability is outstanding.Adopting high-strength steel material that the thickness of material is reduced, thereby realize body lightening, is a good approach.High-strength steel sheet punching press requires higher plastic force, and mold stresses increases greatly.In the situation that the alternate stress that CYCLIC LOADING produces, to bear high load capacity, high impact forces and stress concentrated, mould is easy to produce distortion and the fracture failure causing due to fatigue.In addition, the hardness of advanced high-strength steel steel plate approaches of mold materials itself, causes the wearing and tearing of die-face to be accelerated, and greatly reduced die life.The undesired inefficacy of mould and damage that the fatigue rupture of advanced high-strength steel mould causes, not only can affect the product quality of production, and can cause the waste in mold materials and man-hour, causes the rising of production efficiency reduction and production cost.
Summary of the invention
For probing into high-strength Optimizing die structure method, the present invention proposes a kind of structural optimization method of considering service life, Fig. 1 is the Optimizing die structure method flow diagram that the present invention is based on analysis of fatigue, mainly comprises the following steps:
(1) by Finite Element Method, set up the grid model of mould, with solid element, mould is carried out the boundary conditions such as discrete, definition material properties, kinematic parameter, load, constraints; (2) mould punching process is carried out to finite element simulation, obtain the stress analysis result of mould; (3) according to mold stresses distribution results, according to material requirements, check mould strength, if there is not stress and exceed the region that yield limit (the tension limit) or stress approach yield limit (the tension limit) in stress cloud atlas, prove that mould structure meets requirement of strength, enter next step, otherwise prove that this mould structure does not meet requirement of strength.(4) extract dangerous position FEM model panel load spectrum, analysis of fatigue relevant parameter is set, mould structure is carried out to analysis of fatigue, check the fatigue strength of mould, estimation mould fatigue life; (5) according to stress analysis and analysis of fatigue result, mould is carried out to structure optimization, the stress that reduces mould is concentrated, and improves the fatigue life of mould.In mould use procedure, mainly depend on fatigue life service life, can be converted into service life according to safety coefficient.
The present invention is the advantage of prior art relatively:
(1) for mold materials, select to provide foundation, reduce mold materials waste; (2) estimated the fatigue life of mould, for foundation is provided in service life of mould; (3) optimized mould structure, the stress that has reduced mould is concentrated, and has improved die life; (4), for Design of Dies provides reference frame, shortened the construction cycle of product.
Accompanying drawing explanation
The Optimizing die structure method flow of Fig. 1 based on analysis of fatigue
Fig. 2 punching course mould maximum equivalent cloud charts
Fig. 3 mould node maximum equivalent sequence (sequence from big to small)
Fig. 4 mould analysis of fatigue result
The structural adjustment of Fig. 5 blank holder
Blank holder structure maximum equivalent cloud atlas after Fig. 6 optimizes
Blank holder structure maximum equivalent contrast before and after Fig. 7 optimizes
Mould analysis of fatigue result after Fig. 8 optimizes
The specific embodiment
Below in conjunction with the method for a kind of Optimizing die structure of considering service life of the present invention, the present invention will be further described:
The single action cupping tool blank holder structure optimization that be 1,000,000 punching presses projected life of take is example.Plate is DP780 high-strength steel, and blank holder material is HT300.In finite element software, set up the finite element grid model of mould, set the boundary conditions such as material parameter, kinematic parameter and kinematic constraint of finite element simulation.Mould punching process is carried out to finite element simulation, and as shown in Figure 2, maximum concentrated stress appears at blank holder inside corner position to finite element analysis result, and maximum equivalent is 252MPa.HT300 is cast iron quality, and strength check be take the tension limit as standard, and in punching course, the maximum equivalent of blank holder is less than material tension limit 300MPa, meets requirement of strength.Next carry out analysis of fatigue, what Fig. 3 showed is the node stress detailed data of blank holder FEM model, and it is 252MPa that numbering 169658 nodes have maximum equivalent, selects this node as the object of analysis of fatigue.In finite element software post-processing module delivery node load, according to the fatigue behaviour parameter of blank holder material, joint line fatigue cumulative damage theory, CYCLIC LOADING operating mode is set 1,000,000 times, blank holder is carried out to analysis of fatigue, analysis of fatigue result is as shown in Figure 4: under the operating mode of 1,000,000 CYCLIC LOADING, and the Cumulative Fatigue Damage coefficient D ≈ 1.3 of blank holder., during 1,000,000 CYCLIC LOADING, there is fatigue rupture in Cumulative Fatigue Damage coefficient D>1.
In 3 d modeling software, counter stress concentrates dangerous position to carry out structure optimization.The sharply variation of part section is to produce the concentrated one of the main reasons of stress.As shown in Figure 5, four the former design radius of corner sizes in turning in blank holder structure inner side are R=30mm in the adjustment of blank holder structure, and after revising, radius of corner is R=50mm.Re-establish the FEM model of mould, mould punching process is carried out to finite element simulation.As shown in Figure 6, punching course is revised the time dependent curve of forward and backward blank holder structure maximum equivalent as shown in Figure 7 to amended blank holder structure maximum equivalent cloud atlas.From simulation result, after structure optimization, blank holder maximum equivalent peak value reduces to 241MPa.Blank holder inside corner position stress concentration phenomenon is necessarily controlled, and in whole punching course, maximum equivalent mean value has had obvious minimizing before optimizing.Blank holder structure after optimizing is carried out to analysis of fatigue, analysis of fatigue result as shown in Figure 8: the accumulated damage coefficient D ≈ 0.89 of 1,000,000 CYCLIC LOADING.Accumulated damage coefficient D<1, does not destroy in 1,000,000 CYCLIC LOADING.After optimization, blank holder structure fatigue life is improved, and be about 111.6 ten thousand the fatigue life of the blank holder structure of analysis of fatigue software estimation.
The foregoing is only preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.All any modifications of making are within the spirit and principles in the present invention equal to be replaced and improves, within all should being included in protection scope of the present invention.
Claims (6)
1. consider a method for the Optimizing die structure in service life, it is characterized in that comprising the following steps:
(1) by Finite Element Method, set up the grid model of mould, with solid element, mould is carried out discrete, definition material properties, kinematic parameter, loading environment, constraints.
(2) mould punching process is carried out to finite element simulation, obtain the stress analysis result of mould
(3) according to mold stresses analysis result, check mould structure intensity, if meet requirement of strength, enter next step, otherwise adjust mould structure according to stress analysis result, return to step (1).
(4) according to mold stresses distribution results, determine the moment and position that in punching course, the maximum concentrated stress of mould occurs, this position is the danger position that fatigue rupture may occur mould.
(5) extract dangerous position FEM model panel load spectrum, analysis of fatigue relevant parameter is set, mould structure is carried out to analysis of fatigue, check the fatigue strength of mould, estimation mould fatigue life.If mould meets fatigue life, require service life to illustrate that mould structure meets design requirement, otherwise carry out next step.
(6) according to stress analysis and analysis of fatigue result, adjust mould structure, return to step (1), re-start finite element modeling, finite element simulation, check mould structure intensity, check mould fatigue strength flow process, until mould structure meets design requirement.
2. a kind of method of considering the Optimizing die structure in service life according to claim 1, is characterized in that: in step (1), it is discrete that mould selects solid element to carry out, and plate selects shell unit to carry out discrete.
3. a kind of method of considering the Optimizing die structure in service life according to claim 1, is characterized in that: in step (2), the whole punching course of mould is carried out to emulation, finite element simulation is exported the stress analysis result of a plurality of time steps.
4. a kind of method of considering the Optimizing die structure in service life according to claim 1, is characterized in that: in step (4), according to stress distribution cloud atlas, determine the moment and position that in whole punching course, the maximum concentrated stress of mould occurs.
5. a kind of method of considering the Optimizing die structure in service life according to claim 1, is characterized in that: in step (5), from stress analysis destination file, extract the panel load spectrum of dangerous position FEM model.
6. a kind of method of considering the Optimizing die structure in service life according to claim 1, is characterized in that: in step (6), adjust mould structure, until meet design requirement die life according to stress analysis and analysis of fatigue result.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017146252A (en) * | 2016-02-19 | 2017-08-24 | 株式会社日立産機システム | Electric apparatus diagnosis system |
| JP2017146183A (en) * | 2016-02-17 | 2017-08-24 | 株式会社日立産機システム | Method and system for diagnosing electric apparatus equipped with resin mold for electrical insulation |
| CN107838225A (en) * | 2017-11-27 | 2018-03-27 | 吕言 | Press tonnage monitoring device, method and press machine system |
| CN109766634A (en) * | 2019-01-11 | 2019-05-17 | 徐州徐工矿业机械有限公司 | A kind of mining positive research and development method of large-scale steel-casting digitlization |
| CN110955930A (en) * | 2019-10-22 | 2020-04-03 | 首钢集团有限公司 | Mining engineering vehicle lightweight model obtaining method and device |
-
2014
- 2014-05-11 CN CN201410204461.0A patent/CN104056968A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017146183A (en) * | 2016-02-17 | 2017-08-24 | 株式会社日立産機システム | Method and system for diagnosing electric apparatus equipped with resin mold for electrical insulation |
| JP2017146252A (en) * | 2016-02-19 | 2017-08-24 | 株式会社日立産機システム | Electric apparatus diagnosis system |
| CN107838225A (en) * | 2017-11-27 | 2018-03-27 | 吕言 | Press tonnage monitoring device, method and press machine system |
| CN109766634A (en) * | 2019-01-11 | 2019-05-17 | 徐州徐工矿业机械有限公司 | A kind of mining positive research and development method of large-scale steel-casting digitlization |
| CN110955930A (en) * | 2019-10-22 | 2020-04-03 | 首钢集团有限公司 | Mining engineering vehicle lightweight model obtaining method and device |
| CN110955930B (en) * | 2019-10-22 | 2023-08-11 | 首钢集团有限公司 | Mining engineering vehicle lightweight model acquisition method and device |
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Application publication date: 20140924 |