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1、毕业设计（论文）摘要本文详细地阐述了某飞机结构件零件的制造与工艺及NC铣削加工程序编制。航空类零件因其外形复杂，制造精度高，其工艺编制难度大，用普通机械加工的方法难以胜任这些要求。为利用先进的现代制造技术，提高加工效率，保证加工质量，可采用通用CAD/CAM软件进行三维建模、数控加工。对于该零件的加工，其工艺是决定制造成败的关键。该零件的制造充分利用了三轴和五轴数控加工技术，大大减小了工艺编制的难度。为保证零件加工的经济性，大余量的去除可用普通铣床完成，再通过数控加工中心完成表面的粗、精加工以及孔的钻、铰工序。数字模型建立与数控加工是零件加工
2、精度的保证。鉴于UG的强大功能和友好界面，因此在制造过程的规划上使用此软件进行建模和NC铣削程序编制。该零件的三维建模和数控加工用UG软件完成。其三维建模用到了线架构和曲面设计、自由曲面设计两大模块。数控加工中粗加工为三轴联动加工，半精加工和精加工为五轴联动加工并生成数控加工程序。关键词：三维建模；机械制造工艺规程；NC铣削；UGI毕业设计（论文）AbstractThisthesisexpatiatethemanufacturingprocessofacertainplane’stie-inandtheprocessofdesigningit
3、sNCprogram.Becausetheaeronauticalcomponents’surfaceiscomplex,themanufactureprecisionishigh,itscraftestablishmentdifficultyisbig,theserequestsarenotcompetentwiththeordinarymachiningmethod.Inordertousetheadvancedmoderntechniqueofmanufacturing,enhancethemachiningefficiency,gua
4、ranteethemachiningquality,wecanuseGeneralCAD/CAMsoftwarecarriesontheThreeDimensionalModeling,theNumericalControlMachining.Regardingthissampleparts’machining,itscraftisthedecisionofthemanufacturingsuccessorfailure.ThemanufacturingofthepartshasfullyusedFive-axisnumericalcontr
5、olmachiningtechnology,resultinginreducingthedifficultyofcraftestablishmentgreatly.Inordertoguaranteethecomponents’machiningtheefficiency,theeliminationofbigallowancecompleteswithplain-millingmachine,thencompletesthesurfaceroughing,finishingandtheholedrilling,reamingthrought
6、henumericalcontrolmachiningcenter.Thenumericalmodelestablishmentandthenumericalcontrolmachiningaretheparts’machiningprecisionguarantees.AsUG′spowerfulcapacityanditsfriendlyinterface,wearedeterminedtousethissoftwaretoestablishmodelanddesignNCmillingprocess.Thisparts’three-di
7、mensionalmodelingandthenumericalcontrolmachiningcompletedwiththeUGsoftware.Itsthreedimensionalmodelingusesthetwomodules:WireframeandSurfacedesignandFreestyle.Intheprocessofthenumericalcontrolmachining,theroughingisthethree-axislinkagemachining,thesemi-finishingandthefinishi
8、ngarefive-axislinkagesmachiningandthenproducingthenumericalcontrolmachiningprocedu
