SGER: High Pressure Dynamic Piercing of Microholes

SGER：微孔的高压动态冲孔

• 批准号: 0418683
• 负责人: Rajiv Shivpuri
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0418683&HistoricalAwards=false
• 关键词: SGER; Pressure; Dynamic; Piercing; Microholes

Micro-holes, holes of 200-300 um diameter, have applications in MEMS, pneumatic sensors and manipulators, fluidic filters, fuel injection nozzles, bio-medical filters, ink jet printer nozzles, optical apertures, high pressure orifices, standard defects for testing materials, micropipettes, guides for wire-bonders and spinning nozzles. Various micromachining methods such as microdrilling and micro-EDM can produce these holes with a high degree of accuracy. However, their production rates are often insufficient for production line use. The objective of this SGER research is to create microholes by means of a high-pressure liquid pulse instead of solid punches. The research strategy is to suppress the natural ductility of the sheet material by hydrodynamic pressure and create shear localization at the die corners to initiate a straight and burr free hole. It is proposed to start with copper sheets followed by aluminum and stainless. There are many scientific and technological challenges in this approach including the design and assembly of tooling with precision in the mesoscale, sealing of the tooling for dynamic high pressure pulse, dynamic behavior of the sheet material at a scale where the grain size and micro-hetrogeniety effects cannot be ignored, and micro-tribological issues such as friction at the sheet /blank holder interface. Knowledge and understanding generated in this research will benefit micro and meso manufacturing research and teaching in general, and microforming in particular.

微孔，直径为200-300 μ m的孔，在MEMS、气动传感器和操纵器、流体过滤器、燃料喷射喷嘴、生物医学过滤器、喷墨打印机喷嘴、光学孔径、高压孔、用于测试材料的标准缺陷、微量移液管、用于引线接合器和纺丝喷嘴的引导件中具有应用。各种微加工方法，如微钻孔和微细电火花加工可以产生这些孔具有高精度。然而，它们的生产率往往不足以满足生产线的使用。SGER研究的目的是通过高压液体脉冲而不是固体冲头来创建微孔。研究策略是通过流体动压抑制板材的自然延展性，并在模具角部产生剪切局部化，以形成直孔和无毛刺孔。建议从铜片开始，然后是铝和不锈钢。在这种方法中存在许多科学和技术挑战，包括在介观尺度上精确地设计和组装模具、用于动态高压脉冲的模具的密封、在晶粒尺寸和微观不均匀性效应不可忽略的尺度上的片材材料的动态行为以及微观摩擦学问题，例如片材/坯料保持器界面处的摩擦。在这项研究中产生的知识和理解将有利于微型和中型制造的研究和教学一般，特别是微成形。