外文翻譯----cadcaecam集成系統(tǒng)在壓鑄模具中的應(yīng)用-模具設(shè)計(jì)-文庫(kù)吧在線文庫(kù)
【正文】 ：有限差分法（ FDM）的流體動(dòng)力學(xué)和傳熱方程（如連續(xù)性方程， NavierStokes 方程和傅立葉方程等）或有限元法（ FEM）。該設(shè)計(jì)方案還包括澆注系統(tǒng)，溢出和冷卻通道的工藝設(shè)計(jì)，以及型腔的內(nèi)表面積和模具的熱平衡的計(jì)算和校核。該模具中金屬的流動(dòng)和凝固的模擬使用的是MAGMASOFT 軟件。這樣，縮孔缺陷就基本消除了。這時(shí) CAM軟件將及時(shí)對(duì)這些數(shù)據(jù)進(jìn)行處理并傳送到數(shù)控機(jī)床代碼庫(kù)。例如，由于使用 CAE 進(jìn)行模擬，上面提到的壓鑄件油泵的產(chǎn)品合格率在較短的時(shí)間里從 60%提高到 90%。它的作用是可以在較短的時(shí)間里是生產(chǎn)出高質(zhì)量的壓鑄件，交貨時(shí)間也大大縮短。同時(shí)需要對(duì)更多成功地應(yīng)用在實(shí)際生產(chǎn)中的壓鑄件資料，包括專(zhuān)業(yè)軟件系統(tǒng)中壓鑄件的資料進(jìn)行分析。 CAE 模擬結(jié)果表明，模具型腔內(nèi)的溫度分布不均勻。 集成系統(tǒng)的應(yīng)用總結(jié) 綜上所述，借助于 Pro/ENGINEER 的 CAD/CAM 軟件和主要專(zhuān)業(yè)軟件系統(tǒng)包的幫助，建立壓鑄模的三維實(shí)體造型和設(shè)計(jì)壓鑄工藝的技術(shù)方案。而且油泵壓鑄件的密封要求非常高，所以鑄件需要通過(guò)高水壓測(cè)試，且要求無(wú)任何泄漏。通過(guò)模擬可以清楚地看出金屬流動(dòng)和凝固過(guò)程中出現(xiàn)的問(wèn)題。在數(shù)據(jù)庫(kù) I 中存儲(chǔ)了各種標(biāo)準(zhǔn)零部件的數(shù)據(jù)和模具設(shè)計(jì)的經(jīng)驗(yàn)數(shù)據(jù)，如鑲嵌的厚度，型腔內(nèi)表面到模具外表面的距離等一些經(jīng)驗(yàn)數(shù)據(jù)，隨著該專(zhuān)業(yè)軟件系統(tǒng)數(shù)據(jù)庫(kù) I 的使用，該壓鑄模完整的三維實(shí)體造型終于全部完成，包括外表面和噴射機(jī)構(gòu)，型芯，澆注系統(tǒng)，溢出和冷卻通道等（如圖 3 所示） 。然后用 CAE 模擬軟件模擬壓鑄過(guò)程中金屬液在模具中的流動(dòng)和凝固過(guò)程。交貨的時(shí)間和整體的設(shè) 計(jì)與制造周期可以大大縮短 [2]。壓鑄件的結(jié)構(gòu)正變得越來(lái)越復(fù)雜化和大型化，同時(shí)，一個(gè)新的壓鑄產(chǎn)品的開(kāi)發(fā)周期要求更短。 Numerical simulation of metal flow and solidification 1. Introduction The application of die castings is expanding continuously. The construction of die castings is being more plex and largesized, and at the same time a shorter development cycle of new die casting products is required. How to produce high quality die castings in a shorter period with a lower cost has bee an important and urgent task of die casting enterprises. Recently concurrent engineering (CE) has been introduced into die casting production, and the CAD/CAE/CAM integrated system of die casting dies has been established [1]. In the CE process, the first step is to create a 3D part database for use in all aspects of the production process. The next step is to design the die casting process, which includes the design of gating system, overflows and cooling channels and whole set of die casting dies. In order to avoid the defects in the casting, by means of the casting simulation software the numerical simulation of metal flow and solidification in the dies, . the CAE, is performed. The database also provides the data which are needed in the generation of the cavity roughing and finishing CNC programs for die manufacturing by CAM, and is connected to the coordinate measuring machines (CMMs) for measuring [1,2]. Due to the use of a unitary database of 3D model in the whole period, all these steps can be performed simultaneously. The leadtime and whole cycle of design and manufacture can be shortened greatly [2]. Therefore, die casters have paid more and more attention to the CAD/CAE/CAM integrated system of dies, which embodies the CE concepts of modern advanced manufacturing technique. 2. Establishment of the CAD/CAE/CAM integrated system for die casting dies The general scheme of CAD/CAE/CAM integrated system of die casting dies is shown as Fig. 1. A CAD/CAM software, a CAE simulation software and a die casting expert system are included in it. Due to the plex shape of die castings, the largescale CAD/CAM software is required for the 3D solid modeling and manufacturing. Now the widely used CAD/CAM software are Pro/ENGINEER CAD/CAM software of PTC, Unigraphics II CAD/CAM software of EDS, and IDEAS CAD/CAM software of SDRC, USA. The principle of CAE simulation of castings is based on the solving of the equations in fluid dynamics and heat transfer (such as the continuity equation, the Navier–Stokes equation and the Fourier equation, etc.) by means of finite difference method (FDM) or finite elemen
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