MRI: Track 1 Acquisition of Spray Particle & Spray Droplet Size Analyzer for Precision Manufacturing

MRI：轨道 1 喷雾颗粒的采集

• 批准号: 2333138
• 负责人: Alex Povitsky
• 金额: $ 12.62万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2333138&HistoricalAwards=false
• 关键词: MRI; Track; Acquisition; Spray; Particle

This Major Research Instrumentation (MRI) award supports the acquisition of a spray particle and spray droplet size analyzer for precision manufacturing technology and semiconductor technology. Grinding operations in manufacturing produce substantial heat which can cause damage to the component being made. Coolant must be delivered to the grinding surface, but this coolant can be easily mixed with air causing is to be less effective. The spray particle and spray droplet size analyzer will provide measurements of the break-up of a coolant jet during grinding and will enable improved coolant nozzle design and coolant delivery modeling. This instrument will enable research on variety of materials, including those that are hard-to-grind and hard to dissipate heat, and coolant properties. Improvements in cooling will reduce heat pollution in the environment, which is substantial in the grinding industry. The instrument will also enable evaluation and mitigation of the spread of oil-based coolant and formation of oil mist that represents a fire hazard and safety hazard when inhaled. The instrument will enhance research and training in the Center for Precision Manufacturing at the University of Akron and benefit the Northeastern Ohio region which is home to over 30% of the State of Ohio’s manufacturing workers. The students who will benefit from the instrument, including those from communities under-represented in engineering, will gain hands-on training and knowledge spanning fundamentals of fluid dynamics and heat transfer to the needs of the manufacturing and semiconductor industries.If the heat produced during grinding is not managed properly it can lead to thermal damage such as tensile residual stresses, discoloration, softening, re-hardening, and cracks. Coherent (laminar) jets provide coolant fluid delivery for maximized lubrication at the contact zone critical to defect-free grinding at high material remove rates. Turbulent jet spread does not allow the coolant jet to effectively breach the high-speed air boundary layer - created by entrainment of air along the surface of rapidly rotating grinding wheel - and gain access to the hot wheel-to-workpiece interface. It is unknown to what degree sprayed coolant is delivered to the grinding zone. The spray particle and spray droplet size analyzer will enable improved understanding of the laminar to turbulent transition of a fluid jet under various working conditions. Numerical modeling of the disintegration and transition to turbulence of coherent coolant jets represents challenges that will be overcome using the instrument to verify numerical model of jet break-up. The ability to accurately model coolant jet coherence is a potential game changer in the field of metalworking. To validate the numerical model, the performance of manufactured nozzles will be studied experimentally using the instrument. Also, the presence of particles in the coolant causes contamination of the nozzle that affects the jet disintegration. The evaluation of jet coherence together with quantification of particles in the jet will assist in prediction of need for replacement of the nozzle. Selection of cooling jet parameters to ensure that the jet is coherent will be achieved by studying jet break-up using the acquired instrument.This project is jointly funded by the Major Instrumentation Research Program (MRI) and the Advanced Manufacturing Program (AM) in the division of Civil, Mechanical and Manufacturing Innovation (CMMI).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.

这项主要的研究仪器（MRI）奖支持用于精确制造技术和半导体技术的喷雾颗粒和喷雾液尺寸分析仪。制造业中的磨削行动产生大量热量，可能会损害所制造的组件。冷却液必须递送到研磨表面，但是这种冷却液可以很容易地将其与空气混合在一起的效果较低。喷雾颗粒和喷雾液尺寸分析仪将在研磨过程中提供冷却液射流破裂的测量，并可以改善冷却液喷嘴设计和冷却液递送建模。该仪器将对各种材料进行研究，包括那些难以散热的材料，难以散发热量以及冷却液特性。冷却的改善将减少环境中的热污染，这在磨削行业是很大的。该仪器还将对油基冷却液的传播以及石油雾的形成进行评估和缓解，该油雾代表了涉及火灾和安全危险。该工具将在阿克伦大学（University of Akron）的精密制造中心加强研究和培训，并使俄亥俄州东北部地区受益，该地区拥有俄亥俄州30％以上制造工人的遗体。将从工具中受益的学生，包括从工程中代表不足的社区的学生，将获得动手动态动态和热传递的基本知识，并将热量转移到制造业和半导体行业的需求中，如果磨削过程中产生的热量无法正确地造成热损害，则可以导致诸如紧张的压力，crack不断降低，不良效果，柔和地效应，并将其贬低。连贯的（层流）喷气机提供冷却液输送，以最大化接触区的润滑至关重要的，以高材料以无缺陷的磨削去除速率。湍流的喷气式喷射不允许冷却液射流有效地违反高速空气边界层 - 通过沿快速旋转磨轮的空气入口而产生的高速空气边界层 - 并进入热轮到工作界面的接口。尚不清楚在多大程度上喷涂冷却剂到研磨区。喷雾颗粒和喷雾液尺寸分析仪将使对层流在各种工作条件下对流体射流的湍流过渡。瓦解和向相干冷却液湍流的过渡的数值建模代表了使用该仪器验证喷气破裂数值模型的挑战。精确建模冷却液射流相干性的能力是金属加工领域的潜在游戏改变者。为了验证数值模型，将使用仪器对制造的喷嘴的性能进行实验研究。同样，冷却液中的颗粒的存在会导致影响喷气机崩解的喷嘴的污染。射流连贯性以及射流中颗粒的定量的评估将有助于预测需要更换喷嘴。 Selection of cooling jet parameters to ensure that the jet is coherent will be achieved by studying jet break-up using the acquired instrument.This project is jointly funded by the Major Instrumentation Research Program (MRI) and the Advanced Manufacturing Program (AM) in the division of Civil, Mechanical and Manufacturing Innovation (CMMI).This award reflects NSF's statutory mission and has been deemed honestly of support through evaluation using the Foundation's intellectual merit and broader影响审查标准。