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1、第48卷第10期機(jī)械工程學(xué)報(bào)Vol.48No.102012年5月JOURNALOFMECHANICALENGINEERINGMay2012DOI:10.3901/JME.2012.10.082大型模鍛液壓機(jī)平衡系統(tǒng)原理及其理論研究111211趙長(zhǎng)財(cái)楊盛福劉培培董國(guó)疆曹秒艷郝海濱(1.燕山大學(xué)機(jī)械工程學(xué)院秦皇島066004;2.燕山大學(xué)車輛與能源學(xué)院秦皇島066004)摘要:滑塊平衡系統(tǒng)是大型模鍛液壓機(jī)關(guān)鍵部件,其作用是避免滑塊在工作狀態(tài)下產(chǎn)生傾斜,從而保證上下模具準(zhǔn)確壓合,確保工件質(zhì)量,對(duì)滑塊運(yùn)行精度及產(chǎn)品質(zhì)量的保證具有決定性作用。液壓機(jī)工作過程中,偏心力矩是未知的,如何由實(shí)測(cè)的滑塊四
2、角位移差值確定所需的平衡力,成為一個(gè)關(guān)鍵技術(shù)與理論難題。為此,提出力偶調(diào)平、位置控制平衡系統(tǒng)的新概念及其工作原理,即在滑塊四角布置四組柱塞平衡缸,并由高精度位移傳感器對(duì)滑塊四角行程進(jìn)行實(shí)時(shí)監(jiān)測(cè),以控制相應(yīng)缸組加壓與泄壓。建立了其參數(shù)化力學(xué)模型,推導(dǎo)出滑塊四角位移差值與所需平衡力之間的函數(shù)關(guān)系式,并繪制出相關(guān)曲線,可以在已知滑塊四角位移差值的條件下,為實(shí)際加工過程中平衡力的控制提供理論依據(jù),也可為同類型液壓機(jī)滑塊同步平衡系統(tǒng)的設(shè)計(jì)提供理論參考。關(guān)鍵詞:液壓機(jī)平衡系統(tǒng)平衡力模鍛中圖分類號(hào):TG156PrincipleandTheoreticalAnalysisoftheBalancingS
3、ystemforLargeDieForgingHydraulicPress1112ZHAOChangcaiYANGShengfuLIUPeipeiDONGGuojiang11CAOMiaoyanHAOHaibin(1.CollegeofMechanicalEngineering,YanshanUniversity,Qinhuangdao066004;2.CollegeofVehiclesandEnergy,YanshanUniversity,Qinhuangdao066004)Abstract:Balancingsystemoftheglidingblockiskeycomponent
4、tothelargedieforginghydraulicpress,whichprovidestherectificationmomentontheeccentricloadworkingconditiontoensurethepositionprecisionoftheglidingblockandtheproductquality.Duringtheworkingprocessofthehydraulicpress,theeccentricmomentisunknown,thenhowtodeterminetherequiredrectificationmomentthrough
5、themeasureddisplacementdifferencesofthe4cornersoftheglidingblockbecomesakeytechnicalandtheoreticalpuzzle.Therefore,theconceptandoperatingprincipleofthemomentlevelingandpositioncontrolbalancingsystemhasbeenputforward,thatis,arrangefourpairsofbalancecylindersinfourcornersoftheglidingblock,andmonit
6、orthefourcorner'sdisplacementbyhigh-precisiondisplacementsensorinreal-time,toincreaseorreducethehydraulicpressureofcorrespondingpairofcylinders.theparameterizedmechanicalmodeloftheglidingblockhasbeenconstructed,andtheanalyticfunctionsbetweenthedisplacementdifferencesofthefourcornersoftheglidingb
7、lockandtherequiredrectificationforcehavebeentheoreticallydeduced,thecorrespondingcurveshavealsobeendrawn,whichcanprovidetheoreticalreferencenotonlyfortherectificationforcecontrolduringtheactualworkingprocess,butalsoforthedes