本科机械毕业设计论文CAD图纸QQ401339828PAGEXLIVPAGEii摘要本课题首先主要介绍我国数控机床的发展得过程与现状，并分析其存在的问题，对数控机床的发展趋势进行探讨，并对数控机床主轴箱进行了设计和计算。主轴箱由安装在精密轴承上的空心主轴和一系列的变速出伦组成。数控机床能获得在调速范围内的任意切削速度，以满足零件的切削要求。目前，数控机床的发展趋势是通过电气与机械装置进行无级调速。变频电机通过带传动和变速齿轮为主轴提供动力，通常变频电机的调速范围为3-5，不能满足主轴的变速要求，需串联变速箱以扩大其变速范围。本设计将原来的带轮不卸荷结构设计为带轮卸荷机构，使输入轴在带轮出只受转矩，将轴上的径向力传递到箱体，改善输入轴的受力情况。关键字：主传动系统；分级变速；主轴组件AbstractInthisdesign,thedevelopmentandcurrentsiuuationofNCmachineinchinawasintroducedangaseriesofploblemswerepresented.ThedevelopmenttrendtoNClathewasdiscussed.somecountermeasureswaspresentedforthedevelopmentofNCmachineinchinaandtheheadstockhasbeendesigneg.headstocksiscomposedofthehollowspindlewhichisinstalledinprecisionbearingsandaseriesoftransmissiongears.Thespindlecanobtainanyspeedinthespeedrangetomeettheprocessingrequirementsofcutting.Atpresent,thedevelopmenttrengistoprovideacontinuouslyvariablespeedthroughtheelectricalormechanicaldevices.Variablefrequencymotouconveysthepowerthroughbeltdriveangasetoftransmissiongears.Thespeedrangerequirementsofthespindlespeed;Thetransmissiongearsistoexpandthescopeofavariable-speedtomeetthespeedrangeofthespindle.Inaddition,inthisdesignofthebeltdriveshasbeenchangedfromtheoriginalunloadingstructureintotheloadingstructure,transmissedtheforcetothelathebodysothatinputshaftinonlyforcedtorque,improvedtheforcingstateoftheshaft.Keywords：maindrivesystem；stepspeedchanging；spindleunit目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc390416156"摘要PAGEREF_Toc390416156\hIHYPERLINK\l"_Toc390416157"AbstractPAGEREF_Toc390416157\hIIHYPERLINK\l"_Toc390416158"1引言PAGEREF_Toc390416158\h1HYPERLINK\l"_Toc390416159"1.1本课题的研究背景和意义PAGEREF_Toc390416159\h1HYPERLINK\l"_Toc390416160"1.2本课题的国内外研究现状PAGEREF_Toc390416160\h1HYPERLINK\l"_Toc390416161"1.3本课题研究方法和系统论述PAGEREF_Toc390416161\h2HYPERLINK\l"_Toc390416162"1.4本课题的设计内容概述PAGEREF_Toc390416162\h3HYPERLINK\l"_Toc390416163"2数控机床主传动系统设计PAGEREF_Toc390416163\h4HYPERLINK\l"_Toc390416164"2.1主传动系统的设计要