外文翻譯--板料成形中有限元仿真及相關(guān)技術(shù)的研究進(jìn)展-資料下載頁(yè)
2025-05-12 06:34本頁(yè)面
【導(dǎo)讀】為此，作者調(diào)查了歐洲、日本和美國(guó)的行業(yè)，與工程師和研究人員討論上述問(wèn)。各行業(yè)中使用的軟件如表所示，行業(yè)用戶對(duì)有限元素的評(píng)價(jià)也歸納在表中。據(jù)這些信息提出在這領(lǐng)域的研究方法。汽車(chē)制造商為迎接這些挑戰(zhàn)而采取的戰(zhàn)略是有時(shí)稱(chēng)為3R的策略：縮短上市。時(shí)間，降低開(kāi)發(fā)成本以贏得競(jìng)爭(zhēng)，減少車(chē)輛重量以提高燃料效率。在增加技術(shù)難度，如使用鋁合金和高強(qiáng)度鋼，和要求沖壓件高幾何精度情況下。的硬件和軟件以及最后在合理的時(shí)間內(nèi)處理大型仿真的計(jì)算機(jī)硬件。在80和90年代關(guān)于金屬板料成形仿真已舉辦了許多國(guó)際會(huì)議并發(fā)表了許相關(guān)。然而，通過(guò)這些信息還不足以解決上述問(wèn)題。論貢獻(xiàn)巨大，但是它還不能應(yīng)用于實(shí)際生產(chǎn)。對(duì)三維汽車(chē)車(chē)身面板成形過(guò)程建模。一個(gè)大時(shí)間步長(zhǎng)值，逆變形板料從最終的零件配置到最初的板料配置。維金屬板料有限元仿真的國(guó)際專(zhuān)題討論會(huì)上被提出了。在最近十年期間，由于這些非常密集的研究，板料成。而非基于系統(tǒng)化戰(zhàn)略。
【正文】 he applicability of PAMSTAMP in cooperation with ESI and IBM in 1990. This was the earliest attempt, for Japanese automakers, to employ a FE code to the sheet stamping section. Although Mazda had an inhouse die face CAD system which could provide information for optimizing the die face geometry, the system could not keep pace with the rapid changes in the technical trends and therefore Mazda decided to introduce FE simulation. In contrast to the European automakers, Mazda use only PAMSTAMP as the simulation code, and two engineers are intensively engaged in simulations. Advanced simulation (2) Nissan Motor Nissan started the use of ITAS3D in 1994, and PAMSTAMP and AUTO FORM were introduced a little later to the tool design section. Nissan has developed the special version of ITAS3D in cooperation with Rilke intending to obtain a correct deformation shape at the early stages of stamping operation。 the deformation due tow eight and the binder wrapping. Most of the puter tryouts are performed during the early design stage, just after part design, using the roughly approximated die face geometry. Four engineers are engaged in simulation of new parts and also in the development of the simulation system. (3) Toyota Motor Since Toyota had very advanced geometric modeling software, Die Face CAD, and well trained die design engineers, they were not much enthusiastic for introduction of the simulation. However, the increase usage of high strength steel sheet in the press shop and introduction of new panel shapes, such as a largesize donepiece side panel, forced Toyota to employ FE simulation. LSDYNA3D was tested in 1993 and introduced. Now, Toyota has their own “Virtual Tryout System”, which consists of well defined user interface, LSDYNA3D and a newly developed data base. Currently four simulation engineers work on this system. (4) Nippon Steel The Japan Deep Drawing Research Group (JDDRG) facilitates a close relationship between the automotive and steel panies in Japan. Mainly based on this framework, Nippon Steel has carried out cooperative research works with automotive was introduced in1991, and PAMSTAMP in 1994. The main advantage of FEM simulation is the reduction in the number of experiments, which was the main technical means to solve problems asked by the sheet metal users, before the introduction of FEM. US industries (1) Chrysler Corporation Among the big three automakers in US, Chrysler was the last to introduce the simulation. However, Chrysler developed a most advanced simulation system using CATIA and LSDYNA3D in 1994, which became the mainstream in the design of production die process. All major significant panels are simulated by it. The key reasons which made Chrysler adopt simulation were there cent advances in the dynamic code, the puter hardware and the visualization tool. (2) Ford Motor Company MTLFRM, the only incremental static implicit code used for panel forming simulation, was being developed as early as the end of the 197039。 by Tang and coworkers [69] and is used exclusively at Ford. A major advantage of this code is its ability to predict almost all the forming defects including the spring back, while the drawbacks are long putation time. However, recently, by introducing an advanced direct space matrix solver into MTLFRM, putation time was significantly reduced. The dynamic explicit code OPTRIS is also used in the tool design stage. (3) National Steel In North America there is a cooperative research program between the automakers and sheet metal suppliers, called he AutoSteel Partnership National Steel decided to use FEM simulation to have mon technical bases with the automakers, and introduces LSDYNA3D and FASTFORM3D in 1996. These codes are extensively used in customer support activities, such as the tubular hydro forming and the forming of tailor welded blanks. (4) US Steel US Steel also has close collaboration with automakers through cooperative activities such as the AutoSteel Partnership and he spring back project[36]. Evaluation of service property of steel sheet is an important subject. For example, the dent resistance of formed panel was simulated by bining a dynamic code with a static code.
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