deform成形设备

成形设备PressSystemBehavior‹运用于各种分析z变形Deformationz热传导Heattransferz设备响应Press/equipmentresponse‹锤HammerzEnergybasedzMultipleblowsperforging‹螺旋压力机ScrewpresszEnergybasedzSingleblowperforging‹曲柄压力机MechanicalpresszConstantcycle-typicallysinewavevelocityprofilezInfinitepowerassumed‹液压机HydraulicpresszPowerlimitedzForceandspeedlimitedbyhydraulicsystemzSpeedandloadcontrolquitecommonzOnestrokeperforging成形设备PressSystemBehavior‹速度控制Speedcontrol[constant,F(time),F(stroke)]‹载荷控制Loadcontrol[constant,F(time),F(stroke)]‹锤Hammer[energy,mass,efficiency]‹螺旋压力机Screwpress[energy,inertia,leadangle,efficiency]成形设备PressSystemBehavior‹曲柄压力机Mechanicalpress[forgingstroke,cycles/time,totalstroke]‹液压机Hydraulicpress[powerenvelopedatapairs(load,speed)]‹停止准则Stoppingcriteria:z最大载荷Maximumload-PRINCIPLEDIEz最小速度Minimumspeed(stallcondition)-PRINCIPLEDIEz最大行程Maximumstroke-PRINCIPLEDIE成形设备PressSystemBehavior‹基于能量Energy‹势能Potentialenergy‹动能Kineticenergy‹时间步开始Startoftimestep(allvaluesareknown)‹时间步内变形效果Deformationeffectofonetimestep:PEmgh..=Emv=122Energylosttodeformationloadstrokeefficiency=×成形设备锤KEmv..=122‹时间步结束Endoftimestep‹当能量耗尽,模具运动停止。在前处理器中重新启动能量，然后模拟重新开始，继续模拟第二，第三锤等EnergyoriginalenergyenergylosttodeformationEnergymvloadstrokeefficiencyNewvelocityvloadstrokeeffeciencym=-==12222−×−×××成形设备锤‹基于能量Energy‹动能Kineticenergy‹时间分步耗尽动能‹时间步开始Startoftimestep(allvaluesareknown)‹时间步内变形效果DeformationeffectofonetimestepKEIradiansunittime..,/=×=122ωωEIrotationislinkedtotranslationbytheleadscrewpitch=×122ωiEnergylosttodeformationloadstrokeefficiency=×成形设备螺旋压力机‹时间步结束Endoftimestep‹当能量耗尽,模具运动停止。(Ascrewpresstypicallyisrunwithasingleblow,sincethetimetorestoreenergyisconsiderablygreaterthanthatofahammer)Energyoriginalenergyenergylosttodeformation=-新速度的计算和锤的一样，除去置换转动能和导螺杆螺距的能量为平动成形设备螺旋压力机‹假定功率足够INFINITEpower‹锤头速度Ramvelocity为正弦曲线SINUSOIDAL‹上下死点TopDeadCenter(TDC)andBottomDeadCenter(BDC)‹速率曲线totalstroke(ST)andcycles/unittime(C)‹偏移Offset(actualpartofvelocitycurveusedforforging)requiresforgingstroke(SF)tobeknown成形设备曲柄压力机‹流程Procedurez选择mechanicalpressz输入totalstroke和cycles/unittimez设定SMAX(instoppingcontrols)=STz设定diestrokePRINCIPALDIE=SF-ST这就设定“offset”初始速度startingvelocity在相应的速率曲线成形设备曲柄压力机TopDeadCenterStroke=0StartofforgingStroke=-8EndofforgingBottomDeadCenterStroke=-10Totalpressstroke=10Changeinpartheight=2Setstroke=-8(8”belowtopdeadcenter)Simulateonlytheforgingstroke成形设备曲柄压力机PressStrokeRamspeedTotalpressstrokeForgingstrokeBDCTDC成形设备曲柄压力机‹功率极限Powerlimited‹外在极限Outsidelimitsofmachine:z速率为零时最大力MaximumforceatZEROvelocity=PAz力为零时最大速率MaximumvelocityatZEROforce×P=pressureinhydraulicsystemA=Totalramarea系统流体流动决定成形设备液压机MaximumpowerlimitofhydraulicpressForgingloadRamspeed成形设备液压机Labstobecompletedatthistime(choosethebestoption):‹Lab14:HammerForgingSimulation‹Lab15:ScrewPressSimulation‹Lab20:MechanicalPress-SpikeForging‹Lab21:HydraulicPressSimulation成形设备算例