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第一作业调研报告.........................................................................................................................11.1调研内容.....................................................................................................................11.2工作量与要求.............................................................................................................11.3正文.............................................................................................................................1ThedevelopmentandapplicationofNCmachinetoolservosystem................................2第二作业：典型曲线数字积分法插补方法.................................................................................132.1目的...........................................................................................................................132.2要求...........................................................................................................................132.3DDA法双曲线插补的积分表达式.........................................................................132.4终点判别...................................................................................................................152.5插补举例...................................................................................................................15第三作业：加工中心零件加工编程.............................................................................................173.1目的和要求...............................................................................................................173.2数控机床设备...........................................................................................................173.3加工工艺制订...........................................................................................................193.4要完成的程序编写任务...........................................................................................22《数控技术》课程（2015）大作业院（系）专业姓名学号班号任课教师完成日期哈尔滨工业大学机电工程学院2015年5月1数控大作业第一作业调研报告1.1调研内容请以课堂所学习的知识为基础，自主选择课程中所涉及的任一知识点进行调研。可以调研知识点的发展脉络，也可以重点介绍该知识点的发展现状、争议与未来发展趋势。请提交交独一无二的报告1.2工作量与要求1.报告需用英文撰写，可计算机打印，也可手写，但最后封面需手工签名。2.格式请参照本科生毕业论文要求（见教务处网站），总字数不少于2000字。3.在调研报告的最后，请列出参考的主要文献（英文学术刊物上正式发表的文献不少于5篇）或网址，并在正文中标注引用。4.如果出现雷同，两位同学均无成绩。1.3正文2ThedevelopmentandapplicationofNCmachinetoolservosystemSincetheinventionofNCmachinetoolin1950s,servosystemhasbeentheindispensablecomponentoftheNCmachinetool.Withtherapiddevelopmentofnewmaterials,electronicpowerandcontrollingsystem,theservosystemhasevolvedfromthestep-by-stepsystemtoDCsystemandthentoACsystem.AstheblossomofACservotechnology,ACservosystemwillreplacetheDCsystemwhollyandtakeupthedominantpositioninthefamilyofservosystem.Withtheelectronicpowerconversionunitasactuatorandcontrollerascore,Servosystemwhichcontainstheservodriverandservomotorconstitutesthemainpartoftheelectric-drivingandautomaticcontrolsystem.Whenworking,firstlytheservosystemwillreceivethesignalfromNCdevices,andthendrivethemotionofmachinetoolaswellasensuretheaccuracyandspeedinessofmovementundertheguidanceofpulsecommand.Usually,precisionandspeedoftheNCmachinetoolandothertechnicalindicatorsmainlydependontheservosystemitself1.TheimprovementandassortmentofNCservosystem3Atpresent,engineerstendtoassessthequalitybyreferencetoseveralimportantindicators,suchasprecision,speedandsoon.Therefore,aNCservosystemmustmeettheserequirements.HighprecisionUnlikethetraditionalmanufacturingwhichcanbemanuallyhandledtoregulateandcompensateerrors,theNCservosystemhasahighdemandonpositioningaccuracyandrepeatedpositioningaccuracyQuickreposecharacteristicQuickresponseisoneofimportantindicatorsofservosystem’sdynamicqualitywhichrequirestheservosystemfollowingthecommandsignalwithminimumerroraswellasquickreposeandhighstability.Oncereceivingtheinstructionofmanipulator,theworkingmachinecanrestoretheoriginalstateofequilibriumquicklyafterashortregulationoradisturbancefromouterspace.WidespeedrangeDuetothedifferenceinworkpiecematerials,cuttingtoolandprocessrequirements,servosystemmusthavewidespeedrange,soastoensurethattheCNCmachineinanycircumstancescangettheoptimalcuttingcondition.Thusthemachinetoolcansatisfytherequirementofhighspeedmachiningaswellastherequirementoflowspeedfeed.Thespeedrangeisgenerallylargerthan1to10000.whenthemachineis4workinginalowcuttingspeedwhichaskforalargerstabletorqueoutput,NCservosystemmustmaintainagoodreliability.Goodreliabilitytheusageofmachinetoolisfrequent,usuallywith24hours'continuouswork,sotheservosystemmusthavegoodworkingreliability.ServosystemofNCmachinetoolcanbedividedintoopenloopcontrolsystemandclosedloopcontrolsystemaccordingtothepresenceoffeedbacktestcomponents.DrivecontrolUnittransformsfeedinginstructionstoperformsignalneededbyactuator,andthenactuatorconvertthissignalintomechanicaldisplacement.InOpenloopcontrolsystem,thereisnofeedbackdetectingcomponentsandcomparingcontrollinks.Onthecontrary,theseareessentialpartofaclosed-loopcontrolsystem.ThecompositionofservosystemServosystemcanbeclassifiedintothefeeddrivesystemandthespindledrivesystemonthebasisoffunctionandusage.Besides,theNCservosystemcana