中国激光, 2014, 41 (7): 0703009, 网络出版: 2014-04-23
PMMA微结构件激光融化成型实验
Experiment of Laser Melting-Forming for PMMA Microstructure Parts
激光技术 CO2激光 融化成型 微结构件 复制精度 laser technique CO2 laser melting-molding micro-structured parts replication precision
摘要
为了满足聚甲基丙烯酸甲酯(PMMA)微结构件的高效率和高质量成型加工,提出了激光融化成型新方法,设计和研制实验装置,采用CO2激光扫描辐照方式进行融化成型实验,依据热物理和能量守恒原理,理论计算和模拟分析试样在激光扫描过程中的温度场变化,并通过正交实验设计和实验,分析工艺参数对微结构复制精度的影响。结果表明:熔体温度是影响成型质量的主要因素,温度高则成型精度好;工艺参数对微结构复制精度的影响程度分别是:激光功率对提高复制精度起决定性作用,其次是扫描时间和模具温度,最后是成型压力。采用优化后的工艺参数进行实验,获得较好的微结构复制精度,表明了PMMA微结构件的激光融化成型具有可行性。
Abstract
In order to realize molding process of polymethyl methacrylate (PMMA) micro-structured parts with high efficiency and high precision, a new molding method is presented with laser melting. This paper develops fabrication and experiment devices,and carry out the experiment of laser melting-molding on PMMA microstructures by CO2 laser scanning. According to thermal physics and energy conservation the temperature variation of samples is analyzed with the method of numerical analysis and simulation, and the effects of the various processing parameters on replication quality are investigated via orthogonal experiment. The results show that the temperature of the melt is the main factor affecting the quality of the molding, where high temperature leads to a good molding precision. Laser power is the decisive parameter to influence the replication precision of the micro-structure; scanning time and mould temperature are the secondary factors; molding pressure is the least important among them. At last, the molding process of PMMA microstructure with good replication precision is obtained by optimized process. It is demonstrated that the proposed process is a feasible and effective way to laser melting-molding PMMA micro-structured parts.
谭文胜, 周建忠, 黄舒, 朱炜立, 孟宪凯. PMMA微结构件激光融化成型实验[J]. 中国激光, 2014, 41(7): 0703009. Tan Wensheng, Zhou Jianzhong, Huang Shu, Zhu Weili, Men Xiankai. Experiment of Laser Melting-Forming for PMMA Microstructure Parts[J]. Chinese Journal of Lasers, 2014, 41(7): 0703009.