文獻(xiàn)翻譯—基于catia的汽車(chē)改裝式升降臺(tái)數(shù)字樣機(jī)建模及應(yīng)用研究

1、<p><b>　　附 錄</b></p><p><b>　　附錄A</b></p><p>　　Modified Car Lifting Platform Based on CATIA Modeling and Application of Digital Prototyping</p><p>　　D

2、escribes the use of CATIA V5 mechanical parts i and zero-dimensional modeling, virtual assembly of the basic process components and steps, and worm assembly, for example in detail. The effect of improving the mechanical

3、design to improve design efficiency and shorten the design cycle time, has some practical significance</p><p>　　1 Overview</p><p>　　CATIA software from IBM and Dassault company to launch high-en

4、d CAD / CAM software, has become the international aviation industry preferred design software. With its strong surface design features in the machinery, aircraft, automobile, shipbuilding and other widely used design, C

5、ATIA surface modeling capabilities is reflected in the features and advantages it provides a very rich modeling tools to support the user modeling needs. As its unique high-order Bezier curve and surface features, the &l

6、t;/p><p>　　CATIA V5 is based on the Windows platform, and to fully parametric feature modeling technology as the core feature-based modeling software, which is consistent with the Windows-style menu bar, standa

7、rd shortcuts, contextual menus, multi-document interface, you can make the difference Windows applications to share data, OLE integration, so work quickly and efficiently, can significantly reduce training time. CATIA pa

8、rts assembly is basic, but also the most advantages and features function modules</p><p>　　2 three-dimensional modeling based on CATIA and assembly</p><p>　　2.1 Design sketches</p><p&

9、gt;　　Sketch design is the starting point of three-dimensional design, and its essence is a two-dimensional line, surface design, software design with a traditional two-dimensional functions. Parametric design of the basi

10、c approach is to start from scratch design, size and geometric constraints imposed by creating a sketch feature, then apply the size-driven technology to automatically generate parts of the three-dimensional solid model,

11、 in the use of technology to generate two-dimensional contour ske</p><p>　　2.2 to generate three-dimensional part blank</p><p>　　CATIA has a strong three-dimensional solid modeling functionality

12、, the user plane in the sketch, after drawing two-dimensional graphics, into the part design (Part Design) modules, you can rotate, stretch, lofting, stiffened, and other methods to generate the draft three-dimensional p

13、arts to be rough. Constraints can also use parameterized functions to be modified according to need. Designers can change for the body part blank to achieve the design process by "drawing" to "design"

14、 changes, and C</p><p>　　2.3 complete the three-dimensional modeling</p><p>　　CATIA V5 provides feature-based design, will feature as a design element, the characteristics of the product as a co

15、mbination, through the object from the class to be achieved step by step description of the specific shape of the design. After generating the rough three-dimensional parts can be used to drilling, slotting, shells, cham

16、fer, plus convex sets, such as T with internal and external threads on the "rough" to "processing", the final completion of mechanical parts solid modeling.</p><p>　　2.4 complete the virt

17、ual assembly</p><p>　　Virtual assembly is using virtual assembly technology, three-dimensional computer model will be assembled together, it can avoid the application of physical prototypes, but also for par

18、ts for clearance and interference testing, reduce the sample error rate. In the product design process can use various techniques such as analysis, evaluation, simulation, and give full consideration to the assembly area

19、s and related products during the various possible factors. Product performance and functionali</p><p>　　CATIA-based virtual assembly model has parallel, bottom-up and top-down approach to product developmen

20、t, this article focuses on bottom-up design. Construct the first module in the parts of parts of the three-dimensional model, then components in the assembly module to create constraints between the position, orientation

21、 relationships, about the relationship between parts to quantify the actual with the virtual assembly process between the various components entities location constraint relation</p><p>　　CATIA assembly work

22、bench provides a flexible and intuitive tool to determine the relationship between parts. Workbench allows users to assemble the component parts and various sub-assemblies combined together to form the final assembly in

23、the assembly environment, according to the defined constraints, parts can be modified, analysis, and relocation HJ. CATIA features with a single database, regardless of how editors edit parts and components where the who

24、le assembly of parts to maintain the cons</p><p>　　And Pro / E compared to the assembly process using CATIA has automatically created two parts to be assembled their design basis points of overlap between co

25、mponents to facilitate the designer a clear design basis between the assembly and parts between the base difference.</p><p>　　3 Design Example</p><p>　　The worm drive, for example, the use of CA

26、TIA modeling and assembly process and methods described.</p><p>　　3.1 to create three-dimensional model worm</p><p>　　Analysis of the structure of the worm part, clearly the main features of the

27、 structure to determine the modeling steps. By rotating the worm body, composed of the alveolar and keyway parts, the basic characteristics of a rotating body.</p><p>　　3.1.1 Create three-dimensional model o

28、f the worm part</p><p>　　(1) in draft mode to draw shapes according to the rough shape of the worm rough sketches, the establishment of size constraints, such as size changes, chamfer, etc. (of course, also

29、in the formation of rough chamfer after the entity).</p><p>　　(2) In the design mode, the use of rotating parts (Shaft) tool to generate worm blank.</p><p>　　(3) According to the worm's para

30、meters, to calculate the alveolar pitch worm and the worm screw according to the mode of curves and surfaces generated a worm wrapped around the spiral, as the slot scanning wire.</p><p>　　(4) Since the end

31、of cylindrical worm Archimedes Archimedes spiral, oblique axial plane to a straight line ∞], so the worm shaft can choose almost plane, in draft mode, draw a trapezoid (must be a closed curve), its distance from the axis

32、 of the bottom margin is just the worm tooth root radius, both sides of the edge and face angle of 20. (Note: The pitch at both sides of the edge distance should be the pitch circle space width).</p><p>　　(5

33、) in the part design mode using the narrow slot (Slot) tool to generate an alveolar; use the whole array of tools to worm out of the alveolar process.</p><p>　　(6) in draft mode to draw shapes keyway, the us

34、e of stretch cutting (Pocket) tool to generate key slot, to complete the three-dimensional construction of the worm</p><p><b>　　Mode.</b></p><p>　　3.1.2 create three-dimensional mode

35、l worm parts</p><p>　　Analysis of worm parts of the structure, clearly a major component characteristics to determine the modeling steps. As the worm gear and ring gear teeth by the core 2 parts, so the ring

36、 gear and the tooth should be separated from the core model, and then assembled.</p><p>　　Parts using CATIA modeling platform provided by the ring gear and the worm were generated tooth core.</p><

37、p>　　3.2 parts of the assembly</p><p>　　3.2.1 Import Parts</p><p>　　Assembly in CATIA provides the product structure workbench tool bar, use of existing parts into the function of the prior co

38、nductivity has been designed worm and worm parts.</p><p>　　3.2.2 the establishment of binding</p><p>　　As part of the import process CAITA has established a worm in the worm and the axial profil

39、e width of 1 / 2 of the face overlap constraint relations, has pledged its profile in the worm drive of the main (center section) on the alignment, in The only other two to determine the direction of the constraint relat

40、ionship. Center distance worm gear in accordance with requirements (center distance worm and worm gear during physical modeling, based on the geometric parameters of worm and worm calculate</p><p>　　Along th

41、e axis of the worm to establish worm constraint relation, which is to ensure "in the middle of the worm and worm gear worm side of the axis of symmetry perpendicular to the plane" and "worm width 1 / 2 sym

42、metry on the alveolar surface profile" coincidence (Note: during the worm and worm wheel solid modeling calculations must be accurate, otherwise it will not be accurate worm and worm wheel working position) to ensur

43、e that the worm and worm gear installed in the corresponding position. G</p><p>　　4 Conclusion</p><p>　　CATIA 3D design software design tools provide a complete and convenient user interface, th

44、e interface and options designed with a consistent style with Microsoft products, greatly reducing the user for the software to learn and adapt to the cycle, to a large extent improved the operation of complex 3D modelin

45、g software defects. Meanwhile, CATIA feature-based 3D modeling functions it has the following advantages:</p><p>　　(1) inherited the use of solid modeling software for product design, the user can directly s

46、ee on the screen the true three-dimensional model of the product characteristics, to model their ideas closer to the body composition, more intuitive design.</p><p>　　(2) parametric design changes to facilit

47、ate the graphic size, quickly plotted, relative to the two-dimensional graphics methods, designed to greatly reduce the workload, especially in the subsequent parametric design for the technical staff provides an easy de

48、sign, easy to modify the platform, facilitating product serial design.</p><p>　　(3) The feature-based modeling idea, the use of Boolean operators seeking intersecting lines, intersecting lines, the engineeri

49、ng drawing speed faster, more accurate line.</p><p>　　(4) assembly method using a virtual machine, you can directly check the product design space mechanical system components and assembly of interference an

50、d to further visualize the design and analysis, concurrent engineering has a certain significance.</p><p><b>　　附錄B</b></p><p>　　基于CATIA的汽車(chē)改裝式升降臺(tái)數(shù)字樣機(jī)建模及應(yīng)用研究</p><p>　　介紹了利

51、用CATIA V5進(jìn)行機(jī)械零件i維造型以及零、部件虛擬裝配的基本過(guò)程與步驟，并以蝸輪蝸桿裝配為例進(jìn)行詳細(xì)說(shuō)明。對(duì)于改善機(jī)械設(shè)計(jì)的效果、提升設(shè)計(jì)效率、縮短設(shè)計(jì)加工周期，具有一定的現(xiàn)實(shí)意義</p><p><b>　　1 概述</b></p><p>　　CATIA軟件是IBM公司和Dassault公司合作推出的高端CAD／CAM軟件，現(xiàn)已成為國(guó)際航空工業(yè)首選的設(shè)計(jì)軟件。

52、它以其強(qiáng)大的曲面設(shè)計(jì)功能在機(jī)械、飛機(jī)、汽車(chē)、造船等設(shè)計(jì)領(lǐng)域得到廣泛應(yīng)用，CATIA的曲面造型功能的特點(diǎn)和優(yōu)勢(shì)體現(xiàn)在它提供了極豐富的造型工具來(lái)支持用戶的造型需求。如其特有的高次Bezier曲線曲面功能，次數(shù)能達(dá)到15，能很好地滿足特殊行業(yè)對(duì)曲面光滑性的苛刻要求。應(yīng)用CATlA構(gòu)造的實(shí)體模型可直接應(yīng)用于ANSYS等分析軟件中進(jìn)行有限元分析。CATIA軟件具有與其他三維CAD軟件標(biāo)準(zhǔn)的數(shù)據(jù)接口，方便模型數(shù)據(jù)的轉(zhuǎn)換。  &

53、#160; CATIA V5是基于Windows平臺(tái)的全參數(shù)化和以特征建模技術(shù)為核心的特征造型軟件，它與Windows保持一致風(fēng)格的菜單條、標(biāo)準(zhǔn)的快捷鍵、上下關(guān)聯(lián)的菜單、多文檔界面、可以使不同的Windows應(yīng)用程序共享數(shù)據(jù)的OLE集成，使工作快速高效，可顯著減少培訓(xùn)時(shí)間。零件裝配是CATIA基本的、也是最具優(yōu)勢(shì)和特色的功能模塊，包括創(chuàng)建裝配體、添加指定的部件或零件到裝配體、創(chuàng)建部件之間的裝配關(guān)系、移動(dòng)和布置裝配成員、生成產(chǎn)品的爆炸圖、

54、裝配干涉和間隙分析等主要功能?。</p><p>　　3．1．2 創(chuàng)建蝸輪零件三維模型    分析蝸輪零件的結(jié)構(gòu)，明確主要組成特征，確定建模步驟。由于蝸輪是由齒圈和齒芯2部分組成，所以應(yīng)將齒圈和齒芯分開(kāi)建模，再進(jìn)行裝配。    利用CATIA所提供的零件建模平臺(tái)分別生成蝸桿的齒圈和齒芯。     &

55、#160;   3．2 零件的裝配    3．2．1導(dǎo)入零部件    在CATIA所提供的裝配工作臺(tái)上的產(chǎn)品結(jié)構(gòu)工具欄中，利用插入已有部件功能導(dǎo)人事先已經(jīng)設(shè)計(jì)好的蝸輪和蝸桿零件。    </p><p>　　3．2．2 建立約束    由于在導(dǎo)入部件的過(guò)程中C

56、AITA已建立了蝸桿軸向剖面和位于蝸輪寬度1／2處的端面重合的約束關(guān)系，已經(jīng)保證了其在蝸桿傳動(dòng)的主剖面(中心剖面)上的對(duì)齊，在此只須確定另2個(gè)方向的約束關(guān)系。按照蝸桿傳動(dòng)的中心距要求(中心距在進(jìn)行蝸桿和蝸輪的實(shí)體建模時(shí)，根據(jù)蝸輪與蝸桿的幾何參數(shù)計(jì)算獲得)，建立蝸桿軸線與蝸輪軸線間的偏移約束，確保二者之間的距離滿足設(shè)計(jì)要求。     建立蝸輪沿蝸桿軸線的約束關(guān)系，即保證"位于蝸

57、桿中部與蝸桿軸線垂直的蝸桿齒側(cè)對(duì)稱平面"與"蝸輪寬度1／2處剖面上齒槽對(duì)稱平面"重合(注意：在進(jìn)行蝸桿和蝸輪的實(shí)體建模時(shí)必須計(jì)算準(zhǔn)確，否則將得不到蝸桿和蝸輪的準(zhǔn)確工作位置)，保證蝸桿和蝸輪安裝在對(duì)應(yīng)的位置上。生成如圖1所示的蝸桿傳動(dòng)裝配模型。    4 結(jié)束語(yǔ)    CATIA三維設(shè)計(jì)軟件提供了完整的設(shè)計(jì)工具及方便的操作界面，其界面及選項(xiàng)的設(shè)計(jì)