摘要本文着重对数控镗铣床的主轴箱变速操纵机构和液压平衡系统两个部分做了研究和设计。在对变速操纵机构的设计中，对其工作原理进行分析。依据传动轴的安装、齿轮在轴上的布置和排列、相啮合齿轮的宽度进行机构整体设计。对液压系统的设计中先考虑主轴箱与平衡液压缸的连接，完成两者之间连接结构的初步设计；对液压系统进行分析设计，完成了液压缸的结构和参数设计、液压缸稳定性的校核、液压系统的性能验算等工作。关键词：变速操纵机构；液压平衡系统；平衡液压缸Thedesignofthespeedchangeandcontrolsmechanismandhydraulicbalancedsystemofnumericalcontrolboring-millingmachineAbstractThethesisfocusesonresearchinganddesigningthespindleboxinspeedchangeandcontrolsmechanismandhydraulicbalancedsystemofnumericalcontrolboring-millingmachine.Inthedesignofspeedchangeandcontrolsmechanism,andanalyzeitsprincipletomakeitmeetrequirements,thendesignedentiretyofthemechanismaccordancewithinstallationofthetransmissionshaft,configurationandlacingofgearontheaxis,widthofgearswhicharemesheswitheachother.Inthedesignofhydraulicsystem,thelinkofmainspindleboxandbalancinghydrauliccylinderhavebeentakenintoaccount,thepreliminarystructuraldesignwasfinished;accordingtoanalyzeanddesignhydraulicssystem,thedesignofthestructuresandparametersofthehydrauliccylinder,stabilitycheckcriterionofhydrauliccylinder,thecalculationofhydraulicsystem’sbehaviorwasfinished.Keywords:thespindleboxinspeedchangeandcontrolsmechanism;hydraulicbalancedsystem;balancedhydrauliccylinder目录摘要AbstractTOC\o"1-3"\h\uHYPERLINK\l"_Toc8656"1绪论PAGEREF_Toc86561HYPERLINK\l"_Toc29227"1.1数控镗铣床概述PAGEREF_Toc292271HYPERLINK\l"_Toc2580"1.2数控镗铣床的结构组成PAGEREF_Toc25801HYPERLINK\l"_Toc28699"1.3数控镗铣床的发展动向PAGEREF_Toc286992HYPERLINK\l"_Toc6836"1.4液压技术PAGEREF_Toc68363HYPERLINK\l"_Toc4879"1.4.1液压技术的现状及其发展PAGEREF_Toc48793HYPERLINK\l"_Toc22266"1.4.2液压技术的特点PAGEREF_Toc222663HYPERLINK\l"_Toc1011"2数控镗铣床变速操纵机构设计PAGEREF_Toc10114HYPERLINK\l"_Toc21447"2.1主轴箱变速操纵机构工作原理PAGEREF_Toc214474HYPERLINK\l"_Toc23875"2.2主轴箱变速操纵机构中传动轴的安装PAGEREF_Toc238755HYPERLINK\l"_Toc7768"2.3齿轮在轴上的布置和排列PAGEREF_Toc77685HYPERLINK\l"_Toc10538"2.4相啮合齿轮的宽度PAGEREF_Toc105385HYPERLINK\l"_Toc10862"3液压平衡系统设计计算PAGEREF_Toc108626HYPERLINK\l"_Toc23974