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Fundamental material based investigations to understand electric discharge machinability of electrically conductive ceramics with oxide matrix

基于基础材料的研究，以了解氧化物基体导电陶瓷的放电加工性能

基本信息

批准号：
283180766
负责人：
Professor Dr.-Ing. Thomas Bergs
金额：
--
依托单位：
Werkzeugmaschinenlabor - WZL
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/283180766?language=en
关键词：
Fundamental material based investigations understand

项目摘要

Structural ceramics are used in applications in e.g. Engineering and Medical technology requiring good mechanical properties such as hardness and wear resistance. These properties restrict the machinability of the materials in terms of component complexity and material removal rate. In manufacturing technology of ceramics, net-shape strategies have therefore been developed to mass produce complex components while customized parts are typically produced by green machining of blanks. However for high precision a final machining of these components after sintering is necessary. Electric discharge machining allows for precision machining of customized ceramic components provided that the material is electrically conductive. Yet the EDM process which has become a standard process in machining of metals is not sufficiently understood in case of ceramics. In the project proposed, two material systems of ceramics with oxide matrix and carbide dispersion are investigated. The aim of the study is to elucidate in how far the ED machinability, surface properties and bulk properties of the ceramics can be deduced from their composition and microstructural architecture. Compositions of materials are systematically varied and their interaction with ED machining parameters is studied. For this purpose materials are characterized in depth before and after the machining process with a clear focus on the process zones created by the interaction of the ED process with the material surface. Complementary the machining data are recorded. The correlations found in this multidimensional parameter space are used as input data for a model. The aim is to understand the material removal mechanisms and to enunciate a model-based description of the ED-process which not only allows to quantitatively predict ED-machinability but also to devise a set of design and machining guidelines for the materials investigated. The acquired broad basic knowledge is provided to the industry, ceramics and tooling machine manufacturers as well as end users, for the development of ceramic materials tailored for specific applications as well as for a systematic design of ED machining technologies. It represents a milestone for the Implementation of standardized ceramic-specific technology databases in the tooling machines and will be the key to a widespread application of ED machinable ceramic materials. For this purpose the proposal consolidates the knowledge and experience of both project partners in the field of ED machinable ceramics and in ED machining.

结构陶瓷的应用领域包括：工程和医疗技术需要良好的机械性能，例如硬度和耐磨性。这些特性在部件复杂性和材料去除率方面限制了材料的机械加工性。因此，在陶瓷制造技术中，已开发出净形状策略来批量生产复杂部件，而定制零件通常通过毛坯的绿色加工来生产。然而，为了实现高精度，必须在烧结后对这些部件进行最终加工。放电加工可以对定制陶瓷部件进行精密加工，前提是该材料具有导电性。然而，对于陶瓷加工而言，已成为金属加工标准工艺的电火花加工工艺尚未得到充分理解。在提出的项目中，研究了两种具有氧化物基体和碳化物弥散的陶瓷材料体系。该研究的目的是阐明陶瓷的电火花加工性能、表面性能和整体性能可以在多大程度上从其成分和微观结构中推断出来。系统地改变材料的成分，并研究它们与电火花加工参数的相互作用。为此，在加工过程之前和之后对材料进行深度表征，重点关注 ED 过程与材料表面相互作用产生的加工区域。补充记录加工数据。在这个多维参数空间中找到的相关性被用作模型的输入数据。目的是了解材料去除机制，并阐明 ED 工艺的基于模型的描述，该描述不仅可以定量预测 ED 机械加工性，还可以为所研究的材料设计一套设计和机械加工指南。所获得的广泛基础知识被提供给行业、陶瓷和机床制造商以及最终用户，用于开发适合特定应用的陶瓷材料以及电火花加工技术的系统设计。它代表了在机床中实施标准化陶瓷专用技术数据库的一个里程碑，并将成为广泛应用电火花加工陶瓷材料的关键。为此，该提案整合了项目合作伙伴在电火花加工陶瓷和电火花加工领域的知识和经验。