CN101136038A - Plasticity forming numerical modeling method - Google Patents
Plasticity forming numerical modeling method Download PDFInfo
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- CN101136038A CN101136038A CNA2007100928566A CN200710092856A CN101136038A CN 101136038 A CN101136038 A CN 101136038A CN A2007100928566 A CNA2007100928566 A CN A2007100928566A CN 200710092856 A CN200710092856 A CN 200710092856A CN 101136038 A CN101136038 A CN 101136038A
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Abstract
The method comprises: the questionable feature is inputted into a knowledge-based plastic-forming numeric value simulating module; using the numeric value to simulate similar case in knowledge base; if there is a similar case, the pre-processing file of the case is directly inputted into the plastic-forming numeric value simulating software to make analysis; if there is no similar case, the numeric value simulating knowledge base is used to fill in the numeric value simulating pre-process parameters, and then transmits it to the numeric value simulating software to make analysis.
Description
Technical field
The present invention relates to a kind of plasticity forming numerical modeling method, be used for numerical simulation analysis is carried out in metal parts Plastic Forming processing, belong to the plastic forming technology field.
Background technology
Adopt finite element that the effective tool that numerical simulation has become technological design and mould design is carried out in the metal parts Plastic Forming, by measurable metal flow process of numerical simulation and forming defects, stress, strain, damage, distribution law of temperature field, even organize Changing Pattern, measurable shaping load, stressed, the temperature field of mould, technology and mould design there is very big reference value, it has changed the design cycle of traditional handicraft, reduced the die test number of times, improve design efficiency and level greatly, reduced mould, product development cost.During with the metal forming numerical simulation, after finishing geometric modeling, carry out the input of pre-treatment parameter, its process is comparatively complicated, selects morely, and technician, input parameter are had higher requirement, require technician's Plastic Forming basic theories more on top of, mechanics, finite element, Metal Forming technology, mould knowledge etc., requirement is to input parameter, i.e. pre-treatment parameter has deep understanding, and the pre-treatment parameter of being imported should be accurate.Otherwise simulation precision is not high, is difficult to instruct the design of technology and mould.At present the theoretical research personnel carry out numerical simulation because production technology is not known much have less understanding into, the parameter of inputs such as physical parameter, material model, friction and actual certain gap arranged, Simulation result and actually have than mistake; Enterprise technology personnel then technical merit are relatively low, can not grasp plastic forming theory, Finite Element Method scheduling theory comprehensively, simulation is slow, analog operation is carried out fewly, its accuracy of simulation not high yet (Liu Yuqi, computer simulation is in the application and the current situation of metal forming industry, forges and punching press, 2005,6).Existing simulation softward parameter such as material model are incomplete, material category is few on the one hand, the model of Dui Ying different temperatures is few on the other hand, as U.S. DEFORM software, kind surplus its material model has only 100, and be the Unite States Standard (USS) material, do not comprise in this software of the material model of the many materials of China, thereby can only use close material model sometimes, thereby influenced simulation precision.How effectively utilizing finite element numerical simulation software, improve numerical simulation efficient and precision, is the active demand of academia, industry member.
Summary of the invention
The objective of the invention is to height at metal current plasticity forming numerical modeling requirement Personnel Skill Levels, simulation precision is lower, the existing not congruent problem of basis of software parameter, a kind of new plasticity forming numerical modeling method based on knowledge is proposed, establishment is based on the plasticity forming numerical modeling module of knowledge, this module has the plasticity forming numerical modeling knowledge base, the numerical simulation module is independent of plasticity forming numerical modeling software, can independent operating, the pre-treatment parameter of successful case can be accessed from knowledge base, directly import plasticity forming numerical modeling software, also the pre-treatment parameter under helping, knowledge base directly can be inserted, thereby reduced technical requirement to the simulation personnel, shorten simulated time, and helped to improve dummy level.
For realizing this purpose, the present invention proposes a kind of plasticity forming numerical modeling method based on knowledge base and plasticity forming numerical modeling module.At first with the plasticity forming numerical modeling module of its problem characteristic input, by numerical simulation knowledge base search similar cases based on knowledge.If similar cases is arranged, then this case pre-processing file is directly accessed, directly import plasticity forming numerical modeling software, carry out the plasticity forming numerical modeling analysis.If there is not similar cases, then can helps numerical simulation pre-treatment parameter directly inserted and pass to plasticity forming numerical modeling software again and carry out sunykatuib analysis by the numerical simulation knowledge base.After numerical simulation analysis is finished with pre-treatment parameter and analog result input value modeling knowledge storehouse.
The whole process of the inventive method comprises the retrieval of numerical simulation case, the input of pre-treatment parameter, three steps of numerical simulation knowledge base case filling:
1. numerical simulation case retrieval
Carry out the problem of Plastic Forming simulation for needs, earlier with the plasticity forming numerical modeling module of its problem characteristic input based on knowledge, problem characteristic can be product type feature, shape facility, size feature, material characteristics, forming process feature, by module with the numerical simulation knowledge base in search for, seek similar cases.Comprise plastic molding method ABC, numerical simulation pre-treatment parameter knowledge (wherein material model will be tested through actual tests) and numerical simulation case in the numerical simulation knowledge base and (should comprise the geometric modeling of the part of simulating, set pre-treatment parameter and analog result in the case, analog result comprises the stress field, strain field, temperature field, velocity field, rate of strain field, metal flow, damage of whole process, possible defective and shaping load, and numerical simulation result is through verification experimental verification).
2. pre-treatment parameter input
If similar cases is arranged, then the pre-processing file of this case from the numerical simulation knowledge base directly accessed, and, carry out the plasticity forming numerical modeling analysis directly by plasticity forming numerical modeling module input plasticity forming numerical modeling software based on knowledge.If there is not similar cases, then with numerical simulation pre-treatment parameter by directly inserting based on the tables of data in the plasticity forming numerical modeling module of knowledge, can ask for help by numerical simulation knowledge base inquiry relevant knowledge and case when filling in, after tables of data is inserted the pre-treatment parameter is directly passed to plasticity forming numerical modeling software, carry out the plasticity forming numerical modeling analysis.
3. numerical simulation knowledge base case is filled
After numerical simulation analysis is finished, with the numerical simulation result arrangement, through contrasting with test, behind the Pass Test result, with pre-treatment parameter and analog result input value modeling knowledge storehouse, file layout can be used the used form of numerical simulation software, also data available table, picture, animated format.
The present invention is based on that independently knowledge base and plasticity forming numerical modeling module are carried out the input of pre-treatment parameter, with the direct input value simulation softward of pre-treatment parameter, can avoid existing comparatively loaded down with trivial details selection, the input of numerical simulation software pre-treatment parameter on the one hand, on the other hand, can reduce technical requirement to the simulation personnel, those skilled in the art can carry out the input of pre-treatment parameter under the help of knowledge base, and abundant parameter knowledge, case helps to improve the numerical simulation level in the knowledge base.Can improve numerical simulation efficient and level by the present invention, promote applying of numerical simulation.
The present invention can be used for Plastic Forming new product development, new technology research and development, can be used for fields such as automobile, the manufacturing of motorcycle metal forming spare, the manufacturing of aircraft drip molding, naval vessel drip molding manufacturing.
Description of drawings
Fig. 1 is the inventive method step block diagram.
Fig. 2 is a piston extrusion in the embodiment of the invention 1.
Fig. 3-1～Fig. 3-3 is a special-shaped piston extrusion in the embodiment of the invention 2, and wherein Fig. 3-1 is a front view, and Fig. 3-2 is the A-A cut-open view of front view, and Fig. 3-3 is a upward view.
Embodiment
For understanding technical scheme of the present invention better, be further described below in conjunction with drawings and the specific embodiments.
In the invention process, at first with the plasticity forming numerical modeling module of its problem characteristic input, by numerical simulation knowledge base search similar cases based on knowledge.If similar cases is arranged, then this case pre-processing file is directly accessed, directly import plasticity forming numerical modeling software, carry out the plasticity forming numerical modeling analysis.If there is not similar cases, then helps numerical simulation pre-treatment parameter directly inserted and pass to plasticity forming numerical modeling software again and carry out sunykatuib analysis by the numerical simulation knowledge base.After numerical simulation analysis is finished with pre-treatment parameter and analog result input value modeling knowledge storehouse.
Embodiment
Embodiment 1
Backward extrusion is a kind of typical plastic working technique.The present invention is an example with piston extrusion shown in Figure 2.Material is 20Cr, and size is respectively: Ф d
1=40mm, Ф d
2=30mm, h
1=43 mm, h
2=50mm, R=2mm.
At room temperature be shaped by backward extrusion technology with cylinder blank during extruding.Mould mainly comprises drift, die.Simulation softward adopts U.S. DEFORM software, and concrete steps of the present invention are as follows:
1. numerical simulation case retrieval
---cylindrical shape, size feature, material characteristics---20Cr, technology characteristics---cold extrusion, backward extrusion are that clue is retrieved in based on the numerical simulation knowledge base in the plasticity forming numerical modeling module of knowledge, and whether retrieval has similar numerical value simulation case with the part shape feature.
2. pre-treatment parameter input
By retrieval, find a similar cases in the numerical simulation knowledge base, shape is the same with Fig. 2 part shape, is cylindrical shape also, and size is approaching, and it is of a size of: Ф d
1=42mm, Ф d
2=33mm, h
1=48mm, h
2=55mm, R=2mm.The technology that is adopted also is backward extrusion (room temperature), and material also is 20Cr.There is complete pre-treatment parameter in the case, stores with the Key file mode.Its major parameter has:
Friction factor between punch and blank: 0.12
Friction factor between die and blank: 0.12
Punch kinematic parameter: 15mm/s
Simulation step number: 100
Step-length: 0.48
Blank material model: with room temperature 20Cr compression stress strain curve
Blank temperature: 25 ℃
Plug temperature: 25 ℃
Die temperature: 25 ℃
Blank is divided the grid number: 20000
Punch is divided the grid number: 10000
Die is divided the grid number: 20000
After input DEFORM is finished in the part geometry moulding of required analysis, import the Key file that comprises the pre-treatment parameter of the case that retrieves into DEFORM, finish the input of pre-treatment parameter, the beginning numerical simulation.
3. numerical simulation knowledge base case is filled
After numerical simulation analysis is finished, numerical simulation result is put in order, comprise the pre-treatment parameter, stress field, strain field, damage distributes, metal flow, the forming process load change, mould is stressed etc., through contrasting with test, behind the Pass Test result, with pre-treatment parameter and analog result input value modeling knowledge storehouse, the pre-treatment parameter is stored with the Key file mode, stress field, strain field, damage distributes, metal flow, mould is stressed with the storage of DB formatted file, use the picture format file simultaneously, the animated format file storage, forming process load change picture format file, the sheet format file storage.
Embodiment 2
Piston extrusion shown in Figure 3 is a special-shaped piston, and material is 20CrMn.At room temperature be shaped by compound cold-extrusion technology with cylinder blank during extruding, mould mainly comprises two drifts, die.Simulation softward adopts U.S. DEFORM software, and concrete steps of the present invention are as follows:
1. numerical simulation case retrieval
---cylindrical shape, fork-shaped, material characteristics---20CrMn, technology characteristics---Compound Extrusion, cold extrusion are that clue is retrieved in based on the numerical simulation knowledge base in the plasticity forming numerical modeling module of knowledge, and whether retrieval has similar numerical value simulation case with the part shape feature.
2. pre-treatment parameter input
By retrieval, in knowledge base, do not find similar cases, so in knowledge base, inquire introduction to the pre-treatment parameter, the case that part is similar is through searching, to the top hole shape, can be with reference to figure 2 piston extrusion cases, to fork-shaped, finding an end is fork-shaped extrusion case, respectively with reference to two case input pre-treatment parameters.
After input DEFORM is finished in the part geometry moulding of required analysis, import the Key file that comprises the pre-treatment parameter of the case that retrieves into DEFORM, finish the input of pre-treatment parameter, the beginning numerical simulation.
3. numerical simulation knowledge base case is filled
After numerical simulation analysis is finished, numerical simulation result is put in order, comprise the pre-treatment parameter, stress field, strain field, damage distributes, metal flow, the forming process load change, mould is stressed etc., through contrasting with test, behind the Pass Test result, with pre-treatment parameter and analog result input value modeling knowledge storehouse, the pre-treatment parameter is stored with the Key file mode, stress field, strain field, damage distributes, metal flow, mould is stressed with the storage of DB formatted file, use the picture format file storage simultaneously, forming process load change picture format file, the animated format file, the sheet format file storage.
Claims (4)
1. a plasticity forming numerical modeling method is characterized in that it comprises the following steps:
A. import problem characteristic:, earlier its problem characteristic is imported plasticity forming numerical modeling module based on knowledge for the problem that needs carry out the Plastic Forming simulation;
B. case retrieval: by based on the plasticity forming numerical modeling module of knowledge with the numerical simulation knowledge base in search for, seek similar cases;
C. numerical simulation analysis: if retrieve similar cases in the B step, then directly access the pre-processing file of this case in the numerical simulation knowledge base, and, carry out the plasticity forming numerical modeling analysis directly by plasticity forming numerical modeling module input plasticity forming numerical modeling software based on knowledge; If do not retrieve similar cases, then with numerical simulation pre-treatment parameter by directly inserting based on the tables of data in the plasticity forming numerical modeling module of knowledge, after tables of data is inserted the pre-treatment parameter is directly passed to plasticity forming numerical modeling software, carry out the plasticity forming numerical modeling analysis;
D. numerical simulation knowledge base case is filled: after numerical simulation analysis was finished, with the numerical simulation result arrangement, warp and test contrast were behind the Pass Test result, with pre-treatment parameter and analog result input value modeling knowledge storehouse.
2. plasticity forming numerical modeling method as claimed in claim 1 is characterized in that: described numerical simulation knowledge base comprises plastic molding method ABC, plasticity forming numerical modeling pre-treatment parameter knowledge and numerical simulation case.
3. plasticity forming numerical modeling method as claimed in claim 1 is characterized in that: described problem characteristic comprise the product type feature or/and shape facility or/and the size feature or/and material characteristics or/and the forming process feature; The retrieval of described case be by the product type feature or/and shape facility or/and the size feature or/and material characteristics or/and the forming process feature is carried out the case retrieval; Described analog result comprises that pre-treatment parameter, stress field, strain field, damage distribution, metal flow, forming process load change and mould are stressed.
4. plasticity forming numerical modeling method as claimed in claim 2 is characterized in that: the material model in the numerical simulation pre-treatment parameter knowledge of described numerical simulation knowledge base is through the actual tests test, and numerical simulation result is through verification experimental verification.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165451A (en) * | 2008-09-30 | 2011-08-24 | 新日本制铁株式会社 | Molding simulation method, molding simulation device, program, recording medium, and molding method based on simulation result |
| CN103207922A (en) * | 2013-04-28 | 2013-07-17 | 中国兵器工业第五九研究所 | Case retrieval method based on precise plastic making database |
| CN106156446A (en) * | 2016-07-28 | 2016-11-23 | 重庆大学 | Plastic forming process energy consumption analysis method based on numerical simulation |
| CN108563880A (en) * | 2018-04-20 | 2018-09-21 | 中国兵器工业第五九研究所 | It is a kind of meter and strain hardening and softening metal material constitutive model method for building up |
| CN109471888A (en) * | 2018-11-15 | 2019-03-15 | 广东电网有限责任公司信息中心 | A kind of method of invalid information in quick filtering xml document |
| CN110489475A (en) * | 2019-08-14 | 2019-11-22 | 广东电网有限责任公司 | A kind of multi-source heterogeneous data processing method, system and relevant apparatus |
| CN113111503A (en) * | 2021-04-01 | 2021-07-13 | 重庆传晟酷德大数据科技有限公司 | Multi-source heterogeneous data construction method based on CAD |
-
2007
- 2007-10-18 CN CN200710092856A patent/CN100585603C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165451B (en) * | 2008-09-30 | 2013-11-27 | 新日铁住金株式会社 | Molding simulation method, molding simulation device, program, recording medium, and molding method based on simulation result |
| CN102165451A (en) * | 2008-09-30 | 2011-08-24 | 新日本制铁株式会社 | Molding simulation method, molding simulation device, program, recording medium, and molding method based on simulation result |
| CN103207922A (en) * | 2013-04-28 | 2013-07-17 | 中国兵器工业第五九研究所 | Case retrieval method based on precise plastic making database |
| CN103207922B (en) * | 2013-04-28 | 2016-04-27 | 中国兵器工业第五九研究所 | A kind of Case retrieval course method based on precision plastic forming database |
| CN106156446A (en) * | 2016-07-28 | 2016-11-23 | 重庆大学 | Plastic forming process energy consumption analysis method based on numerical simulation |
| CN108563880B (en) * | 2018-04-20 | 2022-01-28 | 中国兵器工业第五九研究所 | Metal material constitutive model building method considering strain hardening and softening |
| CN108563880A (en) * | 2018-04-20 | 2018-09-21 | 中国兵器工业第五九研究所 | It is a kind of meter and strain hardening and softening metal material constitutive model method for building up |
| CN109471888A (en) * | 2018-11-15 | 2019-03-15 | 广东电网有限责任公司信息中心 | A kind of method of invalid information in quick filtering xml document |
| CN109471888B (en) * | 2018-11-15 | 2021-11-09 | 广东电网有限责任公司信息中心 | Method for rapidly filtering invalid information in xml file |
| CN110489475B (en) * | 2019-08-14 | 2021-01-26 | 广东电网有限责任公司 | Multi-source heterogeneous data processing method, system and related device |
| CN110489475A (en) * | 2019-08-14 | 2019-11-22 | 广东电网有限责任公司 | A kind of multi-source heterogeneous data processing method, system and relevant apparatus |
| CN113111503A (en) * | 2021-04-01 | 2021-07-13 | 重庆传晟酷德大数据科技有限公司 | Multi-source heterogeneous data construction method based on CAD |
| CN113111503B (en) * | 2021-04-01 | 2024-03-05 | 重庆传晟酷德大数据科技有限公司 | CAD-based multi-source heterogeneous data construction method |
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|---|---|
| CN100585603C (en) | 2010-01-27 |
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