Fundamental Research on Plasma Flow and Plasma-Solid Interactions for Laser-Induced Plasma Deburring.

激光诱导等离子体去毛刺的等离子体流和等离子体-固体相互作用的基础研究。

基本信息

批准号：
1911361
负责人：
Benxin Wu
金额：
$ 31.92万
依托单位：
Purdue University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-07-15 至 2024-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1911361&HistoricalAwards=false
关键词：
Fundamental Research Plasma Flow Solid

项目摘要

Removing material to fabricate parts or features can often result in unwanted small burrs (remaining small pieces of material beyond the desired features on workpieces) that typically need to be removed by additional processes. Micro scale deburring can be especially time consuming and expensive due to common challenges such as small features sizes, large burr-to-feature size ratios, and tight geometric feature tolerances. Through this award, a laser-induced plasma deburring process will be studied to determine if plasma flow (ionized gas flow) and plasma-solid interactions can effectively remove micro burrs without imparting significant damage to the workpiece. If this is verified, then laser-induced plasma deburring could find application in micro-deburring a wide range of feature shapes and materials. This new ability could benefit many advanced manufacturing industries relying on burr free, micro-scale structures and features for applications such as medical stents, fuel injector holes, etc. Although this research is focused on gaining a fundamental understanding of plasma flow interactions with micro scale structures (burrs) and the surfaces to which they adhere, the basic knowledge may benefit many other areas or technologies in manufacturing, aerospace and aeronautical fields, e.g., laser plasma-based surface particle cleaning, supersonic flow drag reduction, and micro/nanosatellite propulsion. In addition to the research component, planned engagement of graduate and undergraduate students in the research activities will strengthen the future workforce in advanced manufacturing industries. The next generation of manufacturing engineers will be cultivated through both an enriched undergraduate course on manufacturing, and local community outreach activities. The overall goal of this project is to gain a good fundamental understanding of laser-induced plasma flow, plasma-solid interactions and effects around a burr on a workpiece in the laser-induced plasma deburring process. The specific research objectives are to: (1) fundamentally understand laser-induced plasma flow (including the associated shock wave) and plasma-solid interactions around a burr on a workpiece; (2) understand the plasma effects on burrs and on workpiece surface integrity, microstructures and mechanical properties; and (3) determine if the plasma flow and plasma-solid interactions can generate sufficiently strong impacts to effectively remove micro burrs, without imparting significant workpiece damage. The specific research tasks include: (1) perform time-resolved measurements and observations of the laser-induced plasma deburring process; (2) develop a model to gain insights into the process of the plasma flow and plasma-solid interactions around a burr; and, (3) characterize burrs and workpieces before and after laser-induced plasma deburring to help understand the burr removal mechanism and determine the impact of the process on the remaining surface.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

去除材料来制造零件或特征通常会导致不需要的小毛刺（超出工件上所需特征的剩余小块材料），通常需要通过额外的工艺来去除。由于特征尺寸小、毛刺与特征尺寸比大以及严格的几何特征公差等常见挑战，微尺度去毛刺尤其耗时且昂贵。通过该奖项，将研究激光诱导等离子体去毛刺工艺，以确定等离子体流（电离气体流）和等离子体-固体相互作用是否可以有效去除微毛刺，而不会对工件造成重大损坏。如果这一点得到验证，那么激光诱导等离子体去毛刺可以应用于各种特征形状和材料的微去毛刺。这种新能力可以使许多先进的制造业受益，这些行业依赖于医疗支架、喷油器孔等应用的无毛刺、微尺度结构和特征。尽管这项研究的重点是对等离子流与微尺度相互作用的基本了解结构（毛刺）及其粘附的表面，基础知识可能有益于制造、航空航天和航空领域的许多其他领域或技术，例如基于激光等离子体的表面颗粒清洁、超音速流减阻和微/纳米卫星推进力。除了研究部分之外，研究生和本科生计划参与研究活动将加强先进制造业的未来劳动力队伍。下一代制造工程师将通过丰富的制造本科课程和当地社区外展活动来培养。该项目的总体目标是对激光诱导等离子体去毛刺工艺中的激光诱导等离子体流、等离子体-固体相互作用以及工件毛刺周围的影响有一个良好的基础了解。具体研究目标是：（1）从根本上理解激光诱导等离子体流（包括相关的冲击波）和工件毛刺周围的等离子体-固体相互作用； (2)了解等离子体对毛刺以及工件表面完整性、微观结构和机械性能的影响； (3)确定等离子流和等离子-固体相互作用是否可以产生足够强的冲击以有效去除微毛刺，而不会对工件造成明显的损坏。具体研究任务包括：（1）对激光诱导等离子体去毛刺过程进行时间分辨测量和观察； (2) 开发一个模型来深入了解毛刺周围的等离子体流和等离子体-固体相互作用的过程； (3) 表征激光诱导等离子去毛刺前后的毛刺和工件，以帮助了解毛刺去除机制并确定该工艺对剩余表面的影响。该奖项反映了 NSF 的法定使命，并被认为值得通过以下方式获得支持：使用基金会的智力价值和更广泛的影响审查标准进行评估。