基于分区组合方法的SLA变光斑扫描路径规划  

Scanning Path Planning of Variable Spot Based on Partition Combination Method in Stereolithography

作　　者：郭小锋[1] 关迎召 崔陆军[1] 乔书杰[2] 谷明辉 Guo Xiaofeng;Guan Yingzhao;Cui Lujun;Qiao Shujie;Gu Minghui(School of Mechanical and Electronic,Zhongyuan University of Technology,Zhengzhou 450007 Henan,China;School of Intelligent Engineering,Zhengzhou College of Finance and Economics,Zhengzhou 450044,Henan,China)

机构地区：[1]中原工学院机电学院,河南郑州450007 [2]郑州财经学院智能工程学院,河南郑州450044

出　　处：《应用激光》2024年第7期172-181,共10页Applied Laser

基　　金：国家自然科学基金项目(51705545);河南省科技攻关项目(222102220058,222102220091);河南省高等学校重点科研项目(22A460027)。

摘　　要：激光路径规划是立体光固化打印(SLA)中的关键技术之一。现有的激光路径规划通常采用单一尺寸光斑或简单变光斑扫描方法。单一小光斑扫描不利于提高打印效率,而简单的光斑扫描在打印具有狭长薄壁特征的模型时,容易出现局部成型质量差,甚至打印失败等问题。基于分区组合的思想,提出了一种变光斑分区扫描路径规划算法。算法由以下步骤组成:首先,针对每层切片分别使用大、小光斑完成预扫描以获得数据基础。然后基于预扫描的交点数据,将待填充区域细分为不同光斑类型的子区域。通过判别区域邻接关系,将同类子区域进行合并。最后,在不同光斑类型的合并区域内生成相应的激光扫描路径。实验表明所提出算法相比单一小光斑扫描,在成型质量相近的情况下,对模型A和B,打印效率分别可提高19.5%和21.2%;而相比于简单变光斑扫描,在较少效率损失的情况下,模型A和B成型件的结构强度分别提高了14.3%和14.9%。In the domain of stereolithography(SLA),laser path planning algorithms are pivotal for optimizing the printing process.Traditional methods,which rely on small or simple variable laser spots,often struggle with balancing printing efficiency and quality,particularly when dealing with models that feature long-narrow or thin-walled sections.This paper introduces a novel path planning algorithm that employs a variable spot size,based on the partition-combination concept.The algorithm consists of following steps:For each layer slice,two sizes of laser spots are used to complete pre-scanning process firstly.Then,the filling region is divided into multiple subregions with different spot types.According to the adjacency relationship,the subregions of the same type are merged into larger ones to ensure the scanning continuity.Finally,the merged subregions are filled and generate scanning paths using variable spot.Experimental results indicate that the proposed algorithm enhances the printing efficiency for models A and B by 19.5%and 21.2%,respectively,over single small spot scanning methods,while maintaining comparable formation quality.Furthermore,when compared to simple variable spot scanning methods,the structural strength of models A and B improves by 14.3%and 14.9%,respectively,with only a minimal reduction in efficiency.

关 键 词：增材制造 立体光固化 变光斑 路径规划 分区组合 

分 类 号：TH164[机械工程—机械制造及自动化]