Electro-discharge ultra-fine drilling with carbon fiber electrodes

碳纤维电极放电超细钻孔

• 批准号: 429769676
• 负责人: Professor Dr.-Ing. Eckart Uhlmann
• 金额: --
• 依托单位: Fachgebiet Werkzeugmaschinen und Fertigungstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/429769676?language=en
• 关键词: Electro; discharge; ultra; fine; drilling

The current machining limits of electrical discharge drilling are a hole diameter of Dmin = 6.5 micrometer and an aspect ratio of l/D = 7.5 . Challenges of drilling by electrical discharge machining with small diameters D consist of the manufacturing guiding of the tool electrode. In the case of drill holes with diameters D <= 50 micrometer conventional rod-electrodes cannot be used with the result that the necessary rod-electrodes need to be prepared by electrical discharge dressing which in turn leads to a considerable increase of manufacturing costs.Compared to conventional electrodes the main advantages of carbon fibres as tool electrodes regarding the manufacturing of drill holes with diameters D in the range of a few micrometers are the small diameters D, the good electrical conductivity K, as well as the low costs. However, the use of single carbon fibres as tool electrodes for precision drilling by electrical discharge machining is not sufficiently investigated.Goal of this research project is the investigation, development, and the provision of manufacturing technologies as well as machining strategies for drilling of cylindrical holes with diameters of 10 micrometer <= D <= 30 micrometer and aspect ratios of l/D >= 10 by electrical discharge drilling with carbon fibre tool electrodes. Since no knowledge about the material-related removal process exists a technological research in dependence to generator parameters and dielectrics is necessary. In addition, the investigation of the fundamental relationships of process parameters, the maximum achievable aspect ratio l/D, the minimum achievable manufacturing tolerance, the maximum achievable removal rate Vw, and the reproducibility will be in the main focus of the research.After completion of the research project fundamental knowledge about the material-related removal process and interactions between tool and workpiece as well as technologies for the precision drilling of single holes by electrical discharge drilling with carbon fibre electrodes will be available. The technology that is to be developed in the scope of this project can be used for manufacturing of components like membranes, spinnerets, air bearings, and micro-feeders and can help to reduce manufacturing time and costs.

电气排放钻孔的当前加工极限是DMIN = 6.5千分尺的孔直径，而长宽比为l/d = 7.5。通过小直径D的电气加工钻孔的挑战D包括工具电极的制造指导。对于带直径d <= 50微米的钻孔，不能使用传统的传统杆电极，结果必须通过电气放电敷料来制备必要的杆 - 电极，从而使制造成本相当大的增加，这会导致与常规电力相关的碳纤维纤维的主要优势，而不是少量电动机，而不是制造工具，则是钻机的工具，即钻机的工具，而钻机则是钻机的钻机，而钻机则是钻机的钻机，而钻机则是钻机的钻机，而钻机则是钻机的钻机。直径D，良好的电导率K以及低成本。但是，将单个碳纤维用作刀具电极通过电气排放加工进行精确钻孔。该研究项目的目标是研究，开发和提供制造技术的研究，并提供了钻孔的圆柱孔的钻孔，并用10码尺<= d <= 30微米和远程钻机进行钻孔钻孔，以进行钻孔的钻孔，并提供<= d <= 30微米和远/dirliper <= 30微米和l/d/d/d/d/d。电极。由于对材料相关的去除过程没有任何知识，因此必须进行技术研究，这是对发电机参数的依赖性和介电是必要的。此外，调查过程参数的基本关系，最大可实现的纵横比L/d，最低可实现的制造容忍度，最大可实现的去除率大众VW以及可重复性的重点是研究的主要重点。在研究的完成之后将使用碳纤维电极进行排放钻孔。该项目范围中要开发的技术可用于制造膜，纺纱厂，空气轴承和微型进料器等组件，并可以帮助减少制造时间和成本。