外文翻譯--薄板沖壓件焊裝夾具設(shè)計方法

1、<p><b>　　附 錄</b></p><p><b>　　附錄A 英文文獻</b></p><p>　　On Welding-Installation Fixtures Design of Sheet Stamping</p><p>　　Abstract: Due to forming error an

2、d compliance of stamp-ing, the fixture design of sheet stamping assembly is different from the fixture design of common machining component. In recent years, the new principles and algorithms of fixture design of sheet s

3、tamping have been developed. In the paper, the concept of shape closure and force closure, screw theory were firstly introduced. Secondly, the deterministic locating and total fixturing conditions were derived. Thirdly,

4、an “N-2-1”locating principl</p><p>　　Key Words: Fixture; Sheet Stamping; Optimal Design; Ro-Bust Design</p><p>　　Due to its high productivity and material utilization, stamping is widely used in

5、 automobiles, aircraft, and various household appliances manufacturing industry. The welding assembly of stamping becomes the key process of those products manufacturing, because welding fixture not only affects the perf

6、ormance of productivity, but also is directly related to the quality of the product. Statistics from the U.S. auto industry show that 72% of the body manufacturing errors are from the position error </p><p>

7、　　Manufacturing process (such as machining, welding, assembly and testing, etc.), the fixture is used in three-dimensional positioning and clamping device. The central problem of fixture design is to choose the optimal p

8、ositioning points and determine their best position to achieve the determine constraints positioning of work piece. If the work piece can be full restriction depending on the geometry of contact area will, we called it &

9、quot;shape closed"; If it also have to be fully bound with friction</p><p>　　Over the last decade, the "spiral theory” widely used in fixture design, which describes the three-dimensional motion as

10、 translating along one direction and rotating around this axis. Originally spiral theory proposed by Ball [6], and developed by literature [7] and [8]. According to spiral theory, literature [9] studied seven different t

11、ypes of finger contact, and suggested using finger-like shape to completely fix objects. Literature [10] using the extended spiral theory analyzed that rigid bo</p><p>　　Lots of literatures focus on the fixt

12、ure design of rigid pieces, but the fixture design of flexible sheet pieces is rarely involved, especially considering the deformation of the work piece under processing loads is almost none. In fact, as in the aviation

13、industry and the automotive industry, the deformation of sheet may result in serious bias. For easily deformed sheet, positioning fixture not only has basic functions that limiting rigid body motion, but also must be abl

14、e to limit excessive de</p><p>　　Sheet stamping assembly fixtures are widely used in automobiles, aircraft and household appliances industries, whose design quality directly affects the entire product manufa

15、cturing deviations. Due to sheet metal stamping’s characteristic of flexibility and manufacturing variations, the principle of traditional fixture design can not meet the design requirements, although the research of fix

16、ture design is already quite mature and the positioning principle of rigid part and the "spiral theory" ha</p><p>　　References</p><p>　　[1]　Li B, Tang H, Yang X,et al.Quality Design of

17、 Fixture Planning for Sheet Metal Assembly [ J ].International Journal of Advanced Manufacturing Technology,2007,32 (7-8):690-697.</p><p>　　[2]　Ceglarek D, Shi J. Dimensional Variation Reduction for Automoti

18、ve Body Assembly [J].Manufacturing Review, 1995,8(2):139-154.</p><p>　　[3]　Ceglarek D, Shi J. Fixture Failure Diagnosis for Autobody Assembly Using Pattern Recognition[J].ASME Journal of Engineering Industry

19、,1996,118(1):55-66.</p><p>　　[4]　Apley D, Shi J. Diagnosis of Multiple Fixture Faults in Panel Assembly[J].ASME Journal of Manufacturing Science and Engineering,1998,120(4):793-801.</p><p>　　[5]

20、　Chang M, Gossard D C. Computational Method forDiagnosis of Variation-related Assembly Problems [ J ]. International Journal of Production Research,1998,36 (11):2985-2995.</p><p>　　[6]　Liu Y, Hu S. Assembly

21、Fixture Fault Diagnosis Using Designated Component Analysis [ J].ASME Journal of Manufacturing Science and Engine ering,2005,127(2): 358-368.</p><p>　　[7]　Khan A, Ceglarek D, Shi J,et al.Sensor Optimization

22、for Fault Diagnosis in Single Fixture Systems: a Methodology [ J ].ASME Journal of Manufacturing Science and Engineering,1999,121(1):109-117.</p><p>　　[8]　Djurdjanovic D, Ni J. Stream of Variation Based Anal

23、ysis and Synthesis of Measurement Schemes in Multi-station Machining Systems [ C ]. Proceedings of the ASME International Mechamical Engineering Congress and Exposition, New York,2001,12:297-304.</p><p>　　[9

24、]　Ding Y, Kim P, Ceglarek D,et al.Optimal Sensor Distribution for Variation Diagnosis for Multi-station Assembly Processes[J].IEEE Transactions of Robotics and</p><p>　　Automation,2003,19(4):543-556.</p&g

25、t;<p>　　[10]　Camelio J A, Hu S. Sensor Placement for Effective Diagnosis of Multiple Faults in Fixturing of Compliant Parts [J].ASME Journal of Manufacturing Science andEngineering,2005,127(1):68-74.</p>&l

26、t;p>　　[11]　Li B, Yang J, Ding H. A Rapid Location and State Memory Fixture System for Arbitrarily Part[J].Journal of Donghua University,2000,17(3):27-31.</p><p>　　[12]　Wang Q, Yang J, Li B. Application an

27、d Realization of Rapid Searching Technology in the RL&SM Universal Fixture System[J].Journal of Donghua University,2002, 19(3):19-22.</p><p>　　[13]　Wang Y, Li B, Yang J. Investigation on Dimensional Erro

28、r Compensation for Single Sheet Metal Assembly Station[C]. Proceedings of ICMEM, Wuxi, China,2007:699-703.　　　</p><p>　　[14]　Cai W, Hu S, Yuan J. Deformable Sheet Metal Fixturing: Principles, Algorithms, and

29、Simulations[J].ASME Journalof Manufacturing Science and Engineering,1996,118(3): 318-324. 367Journal of Donghua University (Eng. Ed.) Vol.26, No.4(2009)</p><p><b>　　附錄B 文獻翻譯</b></p><p&

30、gt;　　薄板沖壓件焊裝夾具設(shè)計方法</p><p>　　摘　要:由于薄板沖壓件的易變形性和制造誤差特征,薄板焊裝夾具設(shè)計顯著區(qū)別于普通機械加工工件定位夾具。本文首先介紹了夾具設(shè)計的形閉合與力閉合概念、螺旋理論的發(fā)展,給出了確切定位和完全夾緊條件;然后,重點闡述了面向薄板沖壓件焊裝夾具設(shè)計的“N-2-1”定位原理和夾具的優(yōu)化設(shè)計方法;最后分析了夾具的穩(wěn)健性設(shè)計方法。可以預料,采用該方法可有效地減少和控制定位誤差的

31、影響。</p><p>　　關(guān)鍵詞:夾具;薄板沖壓件;優(yōu)化設(shè)計;穩(wěn)健設(shè)計</p><p>　　沖壓加工以其較高的生產(chǎn)率和材料利用率,廣泛應用于汽車、飛機和各種家用電器制造工業(yè),沖壓件的焊接裝配成為上述產(chǎn)品制造的關(guān)鍵工序,焊裝夾具的性能不僅影響到生產(chǎn)率,而且直接關(guān)系到產(chǎn)品的質(zhì)量。美國汽車工業(yè)的統(tǒng)計表明[1],72%的車身制造誤差源于焊裝夾具定位誤差,因此如何有效地減少和控制定位誤差的影響,對

32、提高焊裝質(zhì)量至關(guān)重要。薄板焊裝夾具與通用的機加工夾具存在顯著的差別,它不僅要滿足精確定位的共性要求,還要充分考慮薄板沖壓件的易變形性和沖壓制造偏差較大的特征,以適應于產(chǎn)品的高質(zhì)量要求。近十幾年來,許多學者在薄板焊裝夾具的設(shè)計上開展了大量工作,提出了一些新型的薄板沖壓件焊裝夾具的設(shè)計理論和方法,取得了顯著效果。本文首先介紹夾具設(shè)計方法的研究進展,然后系統(tǒng)地闡述夾具的N-2-1定位原理、優(yōu)化設(shè)計及魯棒性設(shè)計方法,最后給出本文的結(jié)論。<

33、/p><p>　　制造過程(如加工、焊接、裝配和檢測等)中,夾具是用于在三維空間定位和夾緊工件的設(shè)備。夾具設(shè)計的中心問題就是選擇最優(yōu)定位點數(shù)并確定它們的最佳位置,以實現(xiàn)工件的確定約束定位。如果工件依靠接觸區(qū)域幾何形狀便可完全約束,稱為“形閉合”;如果還必須借助摩擦才能完全約束,則稱為“力閉合”。通常形狀閉合強調(diào)動態(tài)分析,而力閉合則研究工件的靜態(tài)穩(wěn)定。1885年,Reuleaux首先研究了二維工件的形閉合機制,證明了形

34、成二維物體的形閉合必需四個定位點[2]。之后,Somoff證明三維物體的形閉合需要七個定位點,1978年,Lakshminarayana[3]從靜態(tài)平衡角度利用代數(shù)理論進一步證明了三維工件的形閉合至少需要七個點。1988年,Nguyen研究了機器手力閉合機制[4],而Asada和Kitagawa[5]于1989年研究了用于凸形和凹形工件的機器手的形閉合。通常的六點定位原理一般地需要夾緊力將工件完全約束,因此常常是力閉合。</p&g

35、t;<p>　　近十幾年來,“螺旋理論”廣泛流行于夾具設(shè)計中,螺旋理論將三維工件的三維空間運動描述為沿某一方向的平移和繞這一軸線的轉(zhuǎn)動。最初由Ball[6]提出,并得到文獻[7]和文獻[8]的發(fā)展。根據(jù)螺旋理論,文獻[9]研究了七種不同類型的指狀接觸,并建議用指狀外形去完全固定夾緊物體。文獻[10]利用擴展的螺旋理論就剛體的全部或局部約束分析了有摩擦夾緊。文獻[11]提出了用于棱柱形工件的加工夾具自動布置的數(shù)學理論。文獻[

36、12]討論了各夾具定位接觸阻止工件相互螺旋運動的能力,提出了一種用于夾具設(shè)計的工件運動約束方法。文獻[13]利用小螺旋模型考慮了夾具定位誤差對工件幾何精度的影響。文獻[14]在夾具約束分析中研究了表面接觸和摩擦問題。文獻[15]開發(fā)出了考慮動態(tài)約束、完全夾緊和刀具路徑偏差的夾具設(shè)計和分析軟件。可以說,夾具設(shè)計的螺旋理論已經(jīng)用于處理確定定位和完全夾緊問題、定位質(zhì)量、接觸類型和摩擦等問題,并取得了明顯成績。</p><p

37、>　　大量的文獻集中論述了剛性件的夾具設(shè)計,但關(guān)于薄板柔性件的夾具設(shè)計研究很少涉及,特別是考慮加工載荷作用下工件變形的夾具設(shè)計的研究幾乎沒有。實際上,象在航空工業(yè)和汽車工業(yè),薄板變形可能導致嚴重的尺寸偏差。對于易變形薄板,定位夾具除了具備限制零件剛體運動的基本功能外,還必須能夠限制過多的工件變形。較早考慮工件或夾具定位單元剛性的研究見于文獻 [16],他們根據(jù)實驗結(jié)果研究了夾具剛度和磨損對尺寸精度的影響。文獻[17]提出了一種用于

38、柔性定位夾具的夾具系統(tǒng)分析的有限元模型,加工過程中的加工力可看作是作用于節(jié)點的力。基于該模型,可以計算出工件變形、夾緊力和應力分布,可運用庫侖摩擦定律去計算工件與夾具定位單元間接觸處的摩擦力。雖然通過考慮工件變形和有限元分析推動了這一領(lǐng)域,但它既沒有提出任何一種具體的定位原理,也沒有為具有柔性的薄板提出一種定位方案。此外,這種模型并沒有將工件的有限元分析結(jié)果同夾具設(shè)計規(guī)范聯(lián)系起來,它更多的是工件的分析而不是夾具設(shè)計。文獻[18]提出了一

39、種薄板夾具定位分析的方法,他們研究了用于平板和殼體的三點和四點夾具定位系統(tǒng),夾具布置必須使得工件中的應力低于材料的屈服應力。然而,這</p><p>　　薄板沖壓件焊裝夾具廣泛應用于汽車、飛機及家用電器等工業(yè),焊裝夾具的設(shè)計質(zhì)量直接影響到整個產(chǎn)品的制造偏差。由于薄板沖壓件的柔性和制造偏差特征,傳統(tǒng)的夾具設(shè)計原理不能滿足薄板沖壓件的設(shè)計要求,盡管夾具設(shè)計研究已經(jīng)相當成熟,剛性零件的定位原理和“螺旋理論”得到了深入研

40、究。“N-2-1”定位原理針對薄板沖壓件在橫向上的易變形特征,提出了在第一基面上的定位點數(shù)目大于3,定位效果不僅取決于定位點的數(shù)目,而且取決于定位點的布置形式,并提出了采用有限元分析與非線性規(guī)劃的定位點設(shè)計方法。為薄板沖壓件焊裝夾具的設(shè)計提供了理論基礎(chǔ)和設(shè)計方法。由于薄板沖壓件的制造尺寸偏差較大,定位點位置的選擇對定位偏差的影響更明顯,夾具的穩(wěn)健設(shè)計可顯著地改善定位誤差。因此,在薄板焊裝夾具設(shè)計過程中,貫徹“N-2-1”定位原理和穩(wěn)健性