Theory of chip formation in grinding of biphasic brittle materials using the example of WC-Co carbide

以WC-Co硬质合金为例的双相脆性材料磨削切屑形成理论

基本信息

批准号：
249151161
负责人：
Professor Dr.-Ing. Thomas Bergs, since 7/2019
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：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/249151161?language=en
关键词：
Theory chip formation grinding biphasic

项目摘要

The phase fractions and the WC grain size distribution of WC-Co cemented carbides significantly influence their material properties such as, the hardness H, the Youngs modulus E and the critical fracture toughness KIc. Furthermore, during the first research period it was proven that the cemented carbide specification significantly influences the material removal behavior and consequently also the quality of the workpieces of the cemented carbides. In addition to high workpiece quality, grinding of cemented carbides has to meet economical requirements as well. A cost driver is the grinding tool wear. It must be assumed that the cemented carbide specification has a decisive influence on the grinding tool wear. Currently it is unknown how the phase fractions and the WC grain size distribution affects the grinding tool wear. Therefore, the aim of the research project is a description and an explanation model for the tool wear as a function of the WC-Co cemented carbide specification in grinding. For the investigation of the wear mechanisms, single grain cutting tests are carried out. By an analysis of the scratch tracks, the quantitative wear of the grains can be investigated. The qualitative analysis of the grains by means of scanning electron and transmission electron microscopy additionally enables the identification of the wear mechanisms. Grinding tests are then carried out in order to examine the grinding wheel wear and to check the transferability of the findings from the single grain cutting tests. Finally, a qualitative description and explanation model for grinding tool wear in grinding of WC-Co carbides is developed.

WC-CO胶结碳化物的相位分数和WC晶粒尺寸分布显着影响其材料特性，例如硬度H，Youngs Modulus E和临界断裂韧性KIC。此外，在第一个研究期间，证明固定的碳化物规范会显着影响材料去除行为，从而影响碳化物碳化物的工件的质量。除了高工件质量外，胶结碳化物的研磨还必须满足经济要求。成本驱动器是磨削工具穿着。必须假定粘贴碳化物规格对磨削工具的磨损具有决定性的影响。目前，尚不清楚相位分数和WC晶粒尺寸分布如何影响研磨工具的磨损。因此，研究项目的目的是描述和解释模型，该模型是WC-CO胶结碳化物规范的函数。为了研究磨损机制，进行了单粒切割测试。通过对刮擦轨道的分析，可以研究谷物的定量磨损。通过扫描电子和透射电子显微镜对晶粒的定性分析还可以鉴定磨损机制。然后进行研磨测试，以检查磨轮的磨损并检查单粒切割测试中发现的可转移性。最后，开发了用于研磨WC-CO碳化物磨削工具磨损的定性描述和解释模型。