简介：Thedynamicandstaticrecrystallizationbehaviorsoftwinrollcastlowcarbonsteelstripwereinvestigatedwithanattempttoprovideguidingdeformationparametersfortheonlinehotrolling.Inordertoinvestigatedynamicrecrystallizationbehavior,ascaststripwasreheatedandsoakedwithaustenitegrainsizesimilartothewidthleveloftheascastcolumnarstructure.Tensiletestwasusedandthedeformationtemperatureisintherangeof900℃to1100℃andstrainratesare0.01s-1,0.1s-1,1s-1.Theactivationenergyandstressexponentweredeterminedas306kJ/moland4.69respectively.Theratioofcriticalstraintothepeakstrainis0.65,andthatofcriticalstresstothepeakstressis0.92.ThedependenceofthepeakstrainontheinitialgrainsizeandZener-HollomonparametersZisεp=9.1×10-4×D00.48Z0.13.Thekineticsofthedynamicrecrystallizationandrecrystallizedgrainsizewaspredictedusingmodelspublished.Theascastcoarseausteniteweredramaticallyrefinedaftercompletedynamicrecrystallization.Forstaticrecrystallization,thetensiletestwascarriedoutonGleeble-3500thermo-mechanicalsimulator.Thedeformationtemperatureisintherangeof800℃to1200℃withstrainrate0.01s-1to1s-1.Theprestrainisfixedat0.04to0.12andtheinter-hitdelaytimevariesfrom1sto3000s.TheactivationenergyandAvramiexponentofstaticrecrystallizationweredeterminedas241kJ/moland0.54respectively.Akineticsmodelwasproposedtodescribethestaticrecrystallizationkinetics.Thepredictedresultswereingoodagreementwiththeexperimentalresults.

简介：Amagneticandtemperaturefield-coupledmathematicalmodelisproposedtocalculatetheinductionheatingprocessofadiscardsubstitutionblockforbillethotextrusionprocess.Themathematicalmodelisvalidatedbycomparingsimulationresultswithtemperaturemeasurementsrecordedduringphysicalmodeling.Basedonsystematicalanalysisofcalculationresults,aquantitativesawtoothinductionpowercurvewasproposedtorealizetheaimofachievingthebestdistributedtemperaturefieldintheblockwithintheshortestinductiontime.

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简介：Intwin-rollstripcastingprocess,transportphenomenaoffluidinthemoltenpooldirectlyaffecttheprocessstabilityandthequalityofproducts.Inordertoelucidatethefundamentaltransportphenomenaintwin-rollcasting,acommercialsoftwarecalledProCASTwasemployedtosimulatethetransientfluidflowandlevelprofilebehaviorsduringtheearlystageoftheprocessinthisstudy.Thecoupledsetofgoverningdifferentialequationsformass,momentumandenergybalanceweresolvedwiththefiniteelementmethodandthetransientfreesurfaceproblemwastreatedwithavolumeoffluids(VOF)approach.Theeffectofdifferentdeliverysystemsconfigurationonflowpattern,levelprofileinthepoolwasstudiedandanalyzedinthispaper.Thenewwedgemetaldeliverysystemshavebeenoptimizedforthetwin-rollstripcaster.Itwasshownthatnewtypemetaldeliverysystemshadapreferableeffectontheuniformdistributionoffluidandlevelfluctuationinthepool.Thesimulationresultsalsoprovideavaluablebasisfortheoptimizationofdeliverysystemandprocessparametersduringtheinitialpouringstage.

简介：Theentirerollerinlayedblockintelligencecoldstripshapemeterisdevelopedsuccessfullyinthispaper,whichcanstablyworkchronicallyinthecoldrollingworkshop,theindependentinnovationofthekeytechnologyofcoldstripshapemeasuring,theforeigntechnicalmonopolyandblockadearebrokenthrough.Thestructuralformwhichisdifferentfromtheinternationalpopularsegmenteddetectionrollerisputforward,theentiredetectionrollerinlayedblockisdeveloped,agroupofelasticblocksinthatthesenseorgansareinstalledareinlayedintheradialsymmetryrectangulargroovesofthedetectionrollerbody,theentirerollerstructureiscomposedofelasticpiecesandtherollerbody,thescratchofthestripsurfaceduetodifferentthermalexpansionofthetraditionaldetectionrollermeasuringunitisavoidedeffectively.Thesignaltransmissionformwhichisdifferentformtheinternationalpopulardryslipringisputforward,thespraywetslipringisdeveloped,slipringanddetectionrollercanbetakendownandinstalledaspossiblyasfast,sothemaintainisconvenient,whilethroughthesectionauto-spraycleaning,lubricationandcooling,theservicelifeisremarkableimprovedandtheoutsideinterferencesignalisreduced.Thesignalprocessingformwhichisdifferentformtheinternationalpopulargatheringcardisputforward,theembeddedDSPshapesignalprocessinghardwaresystemisdeveloped,theelectromagnet,temperature,humidityandvibration’sinterferenceofindustrypracticetoshapetransmissionsignalcanbeeffectivelyavoided,whichcanguaranteetheinstantaneityandmeasuredprecisionofshapemeasuredsignal.Theshapesignalprocessingsoftwaresystemwhosefunctioncontainserrorcompensation,patternrecognition,establishmentofthetargetshapeandtheclosed-loopcontrolcalculationisbuilt,theshapemeter’computerhumaninteractionisfriendly,andfunctionofshapemeterisstrong,atthesametimetheintellectualizedleveloftheshapemeterisimproved.Now,thi

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简介：在动力公辅系统设备中,引进了组态王HMI软件,进行工艺设备的实时参数监控及其操作。本文主要介绍了该软件系统冗余服务器的特点、结构组成,对其冗余功能的实现进行分析,最终通过实验室实际、组态、测试,完成了冗余数据传输,实现双服务器热备冗余功能。

简介：介绍了西门子6SE70变频器内置自由功能块实现张力控制的原理及应用效果。

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简介：本专利技术在本刊面世以来，受到广大用户欢迎，已承修抚顺红透山铜矿和山东莱芜钢铁股份有限公司等单位起重机主梁近10部，用户认为本技术具有省时间、省材料、高刚度3大特点。

简介：本专利技术在本刊面世以来，受到广大用户欢迎，已承修抚顺红透山铜矿和山东莱芜钢铁股份有限公司等单位起重机主梁近10部，用户认为本技术具有省时间、省材料、高刚度3大特点。

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简介：湘钢第二炼钢厂3号连铸机采用刚性引键杆作为引健装置，具有处理漏钢事故非常方便，节省生产对时间的特点，但有易变形的特点，使引键杆的对弧难度加大，引起引锭杆变形的原因有衬质因素、装配因素和操作因素，采取2种方案可以使引键杆变形问题得到解决。

简介：运用绝对型编码器来替换复杂的、陈旧的主令控制器,实现了高炉上料料车整个行程的数字化。通过PLC编程来控制高炉料车上料,达到控制精确、维护简单、运行可靠的要求。

简介：液体粘性调速离合器是世界上70年代末80年代初兴起的一种新型机械调速装置,它除了具有液力耦合器的优点外,较好地解决了液力耦合器的“丢转”现象,而且易于生产制造。它的基本原理是应用液体的粘性和油膜的剪切作用来传递动力。可长期在打滑状态下工作,实现柔性无级调速,又可传递巨大动力,在大功率风机和水泵上应用,节

简介：介绍了结晶器振动装置在连续铸钢中的重要作用,正弦振动与非正弦振动的特点及采用的实现机构,并分别介绍了3种振动机构的特点、原理及应用。

简介：全面分析了120t钢包烘烤器目前存在的问题，提出了优化改造方案，实施后取得了很好的效果。

简介：介绍了5号高炉消音器的改造情况,及QP-TX气体排散特效消声器的结构和特点。

简介：1西门子公司变频器常见故障案列a.调试过程中西门子MIDIMASTERVector（22kW）变频启动后即过流跳闸。变频器供货方与被控设备的供货方因沟通上的原因,在容量上不匹配（电机功率为30KW）。将变频器的控制模式选为矢量控制,在输入电机参数时,变频器自动将电机的额定电流60A限定在45A,电机铭牌上无功率因数的大小,按变频器手册的要求,将其设定为0,在作自动辨识（po88=1）后启动电机时,变频器过流跳闸。