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Vpliv lastnosti pločevine na natančnost numeričnih simulacij
Rovan, Anej (Author), Pepelnjak, Tomaž (Mentor) More about this mentor... This link opens in a new window

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Abstract
V procesu snovanja in konstrukcije orodij za preoblikovanje pločevine se uporabljajo numerični programi, ki simulirajo obnašanje materiala preoblikovanca v procesu preoblikovanja. Problematika pri tem je, da realna geometrija v nekaterih primerih bolj odstopa od simulirane kot v drugih. V nalogi smo opazovali odstopanje realne geometrije izdelka od teoretičnega modela ter odstopanje simulirane geometrije izdelka od teoretičnega modela. Opazovali smo do kakšnega odstopanja geometrije pride pri preoblikovanju platin treh različnih materialov, usmerjenosti platin v orodju in pa odstopanje zaradi metode obreza izdelka. Primerjali smo obrez izdelka z laserjem in obrez z rezilnimi matricami v orodju. Za posamezno kombinacijo materiala in usmerjenosti platine ter načina obreza smo primerjali odstopanja geometrije realnega preizkusa in simulacije preoblikovanja. Izpostaviti smo želeli ključne dejavnike, ki imajo velik vpliv na zanesljivost rezultatov simulacije. Velik vpliv ima vrsta materiala, saj so nekateri materiali z nizko mejo tečenja občutljivi že na majhne spremembe obremenitev pri preoblikovanju, medtem ko ima učinek elastičnega izravnavanja velik vpliv na geometrijo izdelkov iz materialov z velikimi elastičnimi raztezki. Usmerjenost platine je potrebno upoštevati pri simulacijah preoblikovanja anizotropnih materialov. Geometrija kosa obrezanega z laserjem se bistveno ne razlikuje od kosa obrezanega v orodju z noži, hkrati ima obrez majhen učinek na geometrijo izdelka.

Language:Slovenian
Keywords:orodje za štancanje preoblikovanje pločevine numerična simulacija anizotropija pločevine elastično izravnavanje materialov
Work type:Master's thesis/paper (mb22)
Organization:FS - Faculty of Mechanical Engineering
Year:2018
Views:220
Downloads:113
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Secondary language

Language:English
Title:The Influence of Sheet Metal Charateristic on Accuracy of Numerical Simulations
Abstract:
In the process of molding sheet metal forming tools, numerical programs are used to simulate the behavior of the forming material in the transformation process. The problem posed is that, in reoccurring cases, real geometry deviates slightly from the simulated one. In this paper, we examined the deviation of the real product geometry from the theoretical model and the simulated product geometry from the theoretical model. We observed that a deviation of geometry occurs in the transformation of platinum of three different materials, the orientation of the platinum in the tool and the deviations due to the circumcision method of the product. We analyzed the trimming of the product with a laser compared to cutting it with knives in the tool. For a particular combination of material, the orientation of platinum and the method of circumcision, we compared the deviations of the real experimental geometry with the simulated one. We wanted to highlight key factors which have a major impact on the reliability of the simulation results. The blank material has a significant impact since materials with low yield strength are very sensitive to small changes of loads at forming, on the other hand, spring back is very influential on part geometry made from materials with high elastic strain. The orientation of blank should be taken into account in the simulations of the transformation of anisotropic materials. The geometry of the laser cut parts does not differ significantly from parts cut in the tool with knives, but at the same time, the circumcision has a small effect on the geometry of the product.

Keywords:stamping tool sheet metal forming numerical simulation anisotropy of sheet metal springback of materials

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