Contactless and continuous monitoring of the thermo-mechanical load profiles of protective coatings in the manufacturing technology by integrated ferromagnetic thin films

目前的项目建议旨在开发具有集成和已建立的铁磁薄膜的耐磨薄膜，作为硬金属基板上的薄膜复合材料（切削刀片作为金属切削工具），具有用于工业应用的传感器功能。在生产工艺中，应连续控制耐磨膜或刀具在车削过程中的曝光轮廓。为了实现数据汇编，将改进传感器测量头（高频线圈），该传感器测量头在几毫米距离内以非接触方式通过温度变化引起的磁性能变化来记录磁化率或磁导率的变化。此时，与感应膜应力有关的磁弹性特性，即磁膜各向异性的变化以及与传感器灵敏度相互作用的温度相关磁化，起着至关重要的作用。通过这些数据，将阐述与刀具状态（如磨损）的关系。其中一个挑战是将测量头小型化，同时使其适应整个工具系统，使其尽可能接近切削刃。因此，在实际切割和环境条件（安装、润滑剂和冷却剂）下，模型系统将作为可选产品开发的基础。

The present project proposal aims at wear resistant films with integrated and established ferromagnetic films as a film composite on hard metal substrates (cutting inserts as a tool for metal cutting) with a sensor function for industrial applications. By it the exposure profile of the wear resistant film or tool ought to be continuously controlled during a turning process in production technology. In order to realise data compilation, a sensor measuring head (high-frequency coil) will be refined which records changes of the susceptibility or permeability through changes of the magnetic properties due to the temperature evolution within a distance of a few millimetres in a non-contact mode. At this point, the magnetoelastic properties in connection with the induced film stress, i.e., also changes of the magnetic film anisotropy as well as the temperature dependent magnetisation which interact with the sensor sensitivity, play a crucial role. By means of these data the correlation with the tool status such as wear will be elaborated. One of the challenges, among others, is to miniaturise the measuring head and to approach it to the cutting edge as close as possible by simultaneously adapting it to the entire tool system. As a result a model system representing a demonstrator under real cutting- and ambient conditions (mounting, lubricant and coolant) will serve as a basis for an optional product development.