Process and tool development for micromilling of cemented carbides

考虑到当前部件和工具小型化领域的发展，高强度材料（如硬质金属）的微加工是一个很有前途的研究领域。到目前为止，对硬质金属工件加工的初步研究主要存在于利用聚氯镉涂层刀具进行宏观加工的领域，而不允许将相互作用和切屑形成机制转移到微观加工中。利用氮化或硼化硬质材料层的pvd涂层硬质金属微刀具（d≤1mm）加工硬质金属材料，对刀具设计的机理和工艺相关性进行全面的科学观察和分析是完全未知的。切削刃形状的具体设计，以产生延展性的切屑形成，使WC-Co材料的加工。与其他工艺相比，有很大的潜力产生高效的表面系统。因此，该研究项目追求更高的科学目标，即确定具有不同硬相和粘结剂含量的硬质金属材料微加工的基本机制和相互关系，从而实现这类材料的微铣削加工。为了实现这一目标，加工技术研究所（ISF， Biermann教授）和材料工程系主任（LWT， Tillmann教授）之间的跨学科研究方法将在工艺和工具方面研究用于硬质合金切削的摩擦学适应微刀具的开发基础。

The micromachining of high-strength materials such as hard metals is a promising field of research, taking into account current developments in the field of miniaturization of components and tools. Up to now, first investigations on the machining of hard metal workpieces exist mainly in the field of macro-machining using PCD-coated tools, which, however, do not allow a transfer of the interactions and chip formation mechanisms for micro-machining. Comprehensive scientific observations and analyses of the mechanisms and process-relevant correlations to the tool design for the machining of hard metal materials by means of PVD-coated hard metal micro tools (d ≤ 1 mm) with nitridic or boridic hard material layers are completely unknown. The specific design of the cutting edge shape to produce a ductile chip formation enables the machining of WC-Co materials. In comparison to alternative processes, there is a great potential for the generation of efficient surface systems. Therefore, the research project pursues the superordinate scientific goal of identifying the basic mechanisms and interrelationships of micro-machining of hard metal materials with varying hard phase and binder content and thus making micromilling machining of this class of materials accessible. In order to achieve this goal, the interdisciplinary research approach between the Institute of Machining Technology (ISF, Prof. Biermann) and the Chair of Materials Engineering (LWT, Prof. Tillmann) will research the fundamentals for the development of tribological-adapted microtools for carbide cutting on the process and on the tool side.