搜索
陕西航空职业技术学院毕业设计（论文）说明书机电工程系机电一体化-1-数控车床纵向进给系统设计摘要了解数控机床的概念，所谓数字控制是按照含有机床(刀具)运动信息程序所指定的顺序自动执行操作的过程。而计算机数控机床就是数控机床在计算机监控下进行工作。它的优点很多,可以在同一机床上一次装夹可完成多个操作，生产率显著提高等优点，但它的价格昂贵。由于我国现在使用的机床大多数为普通车床，自动化程度低,要更新现有机床需要很多资金。为了解决这个问题,也为了适应多品种中、小批量零件加工我们选择机床经济型数控改造。纵向进给机构的改造：拆去原机床的溜板箱、光杠与丝杠以及安装座,配上滚珠丝杠及相应的安装装置，纵向驱动的步进电机及减速箱安装在车床的床尾,不占据丝杠空间。横向进给机构的改造：拆除横向丝杠换上滚珠丝杠,由步进电机带动。总体设计方案:CJK6140车床主轴转速部分保留圆机床的手动变速功能。车床的纵向和横向进给运动采用步进电机驱动。最后,根据已知条件对纵向横向伺服进给机构进行设计与计算。关键词：运动信息，滚珠丝杠，步进电机-2--2-CJK6140NCLathesVerticalFeedSystemDesignABSTRACTNumericalControl(NC)isanymachiningprocessinwhichtheoperationsareexecutedautomaticallyinsequencesasspecifiedbytheprogramthatcontainstheinformationforthetoolmovement.WhenNumericalControlisperformedundercomputersupervision,itiscalledComputerNumericalControl(CNC).CNCmachineshavemanyadvantagesoverconventionalmachines.Forexample,thereisapossibilitylfperformingoperationsonthesamemachineinonesetupandproductionissignificantlyincreased.Oneofitsdisadvantagesisthattheyarequiteexpensive.Inourcountryconventionalmachineisusedwidely.Soifthemachinesarereplaced,thereisgoingtoneedalargemoney.Inordertoagreewiththedevelopmentofoureconomy,wecanreformtheconventionalmachines.Thereformationofthetoolmovement:wedemolishthecurrentsmoothleading,leadingscrewandinstallingstand.Thenreplacetheballleakingtotherelevantposition.Thereformationofthehorizontalmechanism:wemakethehorizontalballleadscrewinsteadoftheconventionalscrew.AndSteppermotordrivesthescrew.Theoverallmasterdesign:thespindle’sgearshiftoftheCA6140mechanismcontrolledbytheformeroperatinglever.Themovingoftheverticaltableandthehorizontaltableisdrovebytheballscrew,whichisdrovebytheSteppermotors.Thelast,wedesigntheverticalandhorizontalmechanismonthebasisofknownnumbers.)KEYWORDS:toolmovement，conventionalmachines，Steppermotor-3-目录CJK6140数控车床纵向进给系统设计....................................................................................1摘要.....................................................................................................................................-1-ABSTRACT..........................................................................................................................-2-第一部分绪论...................................................................................................................-1-第二部分设计方案的确定.................................................................................................-3-2.1数控系统运动方式的确定.....................................................................................-3-2.2伺服进给系统的改造设计.....................................................................................-3-2.3数控系统的硬件电路设计......................................................................................-4-2.4纵向进给系统的设计.............................................................................................-5-第三部分机械设计.......................................................................................................-6-3.1纵向进给系统的设计.............................................................................................-6-3.2切削力的计算.........................................................................................................-6-3.3滚珠丝杠的设计计算.............................................................................................-7-3.3.1求轴向力.......................................................................................................-7-3.3.2计算丝杠动载荷Cj......................................................................................-7-3.3.3丝杠效率计算...............................................................................................-8-3.3.4校核...............................................................................................................-8-3.4齿轮箱减速器设计部分.........................................................................................-9-3.4.1传动比i.........................................................................................................-9-3.4.2齿面接触强度设计计算...............................................................................-9-3.4.3齿根弯曲强度设计：..................................................................................-11-3.4.4设计计算：.................................................................................................-12-3.5其他机械设计部分...............................................................................................-12-3.5.1减速箱最小输出轴的计算.........................................................................-12-3.5.2轴承的选择.................................................................................................-13-3.6步进电机的选择...................................................................................................-13-3.6.1计算减速器的传动比I...............................................................................-13-3.6.2计算系统转动惯量......................................................................................-13-3.6.3确定步进电机动力参数.............................................................................-14-第四部分数控设计...................................