毕业论文- sla设备的机械系统设计.docVIP

SLA设备的机械系统设计 学 院 机电工程学院 专 业 班 级 学 号 姓 名 指导教师 负责教师 2013年6月 Abstract Since the mid-1980s, Stereolithography technology development and application of more extensive and in-depth, light curing machine demand is also growing. Thus, this thesis light curing machine mechanical structure has been designed. Including: 1, XY scanning mechanism; 2, Z axis lifting mechanism; 3, scraper, and on which part of the structure has been improved. XY plane scanning direction movement and horizontal movement of the blade using precision ball screw drive, so that it does not appear when a longer trip jitter, will help ensure scanning accuracy, movement and stability. Using linear stepper motor directly connected to ball screw, respond more quickly and accurately, but because there is no middle parts, simplify the mechanical structure and high precision. Through the three-dimensional modeling of light-cured in the design and mechanical systems, making their campaigns and drive more reasonable and stable, then in the production process so that it can better carry out production. Keywords: Scanning; agencies; Rapid Prototyping ; Transmission　 目 录 摘 要 I 目 录 III 1绪 论 1 1.1 快速原型技术简介 1 1.1.1 RP的基本构思 1 1.1.2 几种典型的快速成型技术 2 1.1.3 各种成型方法简介及对比 4 1.2 快速成型精度概述 4 1.3 立体激光固化成型（SLA）的成型原理 6 1.4 SLA的国内外发展现状 7 1.5 本次设计的主要工作 8 1.5.1 主要设计任务 8 1.5.2 主要技术参数 8 2机械结构的设计方案 9 2.1 X-Y向扫描运动机构的设计 9 2.2 Z轴升降系统设计 10 2.3 刮刀系统的设计 12 3机械结构的设计计算 13 3.1脉冲当量、传动比及步进电机步进角的确定 13 3.2 滚珠丝杠的选型与计算 13 3.2.1滚珠丝杠受力计 13 3.2.2 滚珠丝杠螺母副的选型和校核 16 3.3 导轨的选型及计算 23 3.3.1 初选导轨的型号 23 3.3.2 计算滚动导轨副的距离寿命 23 3.4 步进电机的选择 24 3.4.1 步进电机简介 24 3.4.2 传动系统等效转动惯量的计算 25 3.4.3 所需转动力矩的计算 27 3.5 联轴器的选择 33 3.6 轴承寿命计算 34 3.6.1 X-Y向深沟球轴承寿命计算 34 3.6.2 Z向深沟球轴承寿命计算 35 3.7 刮刀系统设计 35 3.7.1 刮板的选择 35 3.7.2 刮板的材料和移动速度对涂层质量的影响 36 4 PLC控制系统 38 4.1步进电机的简介 38 4.2步进电机的工作原理及特性 38 4.3 PLC简单介绍