机械5

基于平动并联机构的机床的运动学分析与设计 摘要 随着信息技术的进步和全球化制造技术的进步，企业为了提高自身的竞争力，需要更高效的成本更低的加工设备，而传统的机床在未来的加工行业中将是H。克服高速加工（轨道速度可达50米/分钟）和空间曲面加工和机床通用性等困难将无法满足现代加工技术的要求。因此，探索和研究现代机床具有十分重要的意义。 虚拟轴机床比传统的系列数控机床具有许多优点。传统数控机床的各种自由度串联、悬臂结构、级联嵌套LED传动链长、传动系统复杂、累积误差大、精度低、成本昂贵，目前大多数机床为4轴联动，很少5轴。虚拟轴机床的并联加工中心结构简单，传动链短，刚度大，质量轻，切削效率高，响应快，特别是六轴联动容易实现，因此可以加工成更复杂的三轴。弯曲曲面的加工精度和粗糙度直接由控制程序保证，因此，硬件成本低，且附加值高的软件，高附加值是一种机电一体化产品。 针对目前机械加工的发展趋势，本文设计了一种并联机床试验台。并行部分分配给合作者，作者主要负责并联机床实验台的总体框架结构设计。 该平台由三个并联的并联螺杆（驱动电机）、铸铁机架、加载卡平台、电主轴和弹簧铣夹头组成。 关键词：并联机构；虚轴加工；雅可比矩阵；正解算法 Ki
nematic A
nalysis a
nd Desig
n of Machi
ne Tools Based o
n Parallel Tra
nslatio
n Structure Abstract With the progress of the i
nformatio
n tech
nology a
nd the developme
nt of the global ma
nufacturi
ng tech
niques, e
nterprises require more efficie
nt a
nd lower cost machi
nes by reaso
n of e
nha
nci
ng their competitive ability. But co
nve
ntio
nal machi
ne toolswill e
ncou
nter ma
ny difficultieswhich are hard to overcome i
n the future, for i
nsta
nce of high-speed machi
ni
ng( path speed exceedi
ng 50m/mi
n)a
nd high efficie
nt space curved surfaci
ng machi
ni
ng aswell as flexibility of machi
nes. Thus, it isvery importa
nt to explore a
nd study ki
nd of moder
n machi
nes. Be compared to the
normal
numerical co
ntrol machi
ne tool, it has larger rigidity, stro
nger carryi
ng capacity, smaller error, higher precisio
n, smaller ratio of self-weight a
nd load, better dy
namical capacity, less i
nvestme
nt of hardware, but stro
nger fu
nctio
n of software. All of these show its high additio
nal tech
nicalvalve. This research topic for the curre
nt tre
nd of the processi
ng machi
ne, developed a desig
n of a parallel machi
ne test-bed task,which the Author co-desig
n a
nd a part
ner. Some of them parallel to the allocatio
n of the part
ner, the author mai
nly respo
nsible for the PMT test-bed framework of the overall structural desig
n. Platform from roughly parallel bodies- three parallel screw(motor drive
n), cast iro
n rack,with card platform a
nd Spi
ndle a
nd milli
ng chucks of spri
ng. Keywords: parallel i
nstructio
n,virtual axis processi
ng, Jacobia
n Matrix, positive solutio
n algorithm 目录 摘要I Abstract II 1.绪论1 1.1课题背景与意义1 1.2并联机床发展历史及现状2 1.3本文主要研究内容8 2.重要零部件选型10 2.1依照主轴功率确定电主轴型号10 2.2选择主轴下部刀具夹头11 2.3工件装卡夹具选用12 2.4滚珠丝杠螺母副的计算与选型16 2.4.1最大工作载荷的计算16 2.4.2最大动载荷的计算17 2.4.3规格型号的初选18 2.4.4刚度的验算18 2.4.5稳定性的校验20 2.4.6滚珠丝杠总长度的确定20 2.5滚动轴承的选用21 2.5.1基本额定载荷21 2.5.2滚动轴承的选择21 2.5.3轴承的校核22 2.5.4步进电机转轴上总转动惯量的计算23 2.5.5步进电机转轴上等效负载转矩的计算25 2.5.6步进电动机尺寸28 2.6联轴器的选用29 3.机床数学模型建立31 3.1机床空间位置理论31 3.1.1位置逆解模型32 3.1.2灵活度分析33 3.2铸造机架的材料及热处理36 3.3机架的截面形状、壁厚及周边筋的布置36 3.4立柱与底座的连接方式39 3.5底座的造型40 4.机床电路设计41 4.1电路布线方案41 4.2电路控制要求41 4.3电路控制连线原理41 5.实验结果与三维建模43 5.1设计并联机床结果43 5.2并联机床solidworks三维建模43 总结与展望46 参考文献47 附录49 致谢54