Influence of tool coating condition on side milling of amorphous laminated composite block

Abstract

Iron-based amorphous metallic glass foil has a growing demand for the energy-efficient electric parts due to the excellent magnetic performances. The extreme mechanical properties in terms of high ultimate strength and high hardness make it to be a typical difficult-to-cut material. In addition, the form of ribbon foil formed by melt spinning technique can effectively reduce the eddy loss but also makes the conventional milling to be hardly performed. Amorphous laminated composite block consisted of metallic glass foils bonded by adhesive material provides an alternative structure. In this work, the investigations on machineability and tool wear were conducted using amorphous composite block consisted with iron-based metallic glass foil and acrylic adhesive bonding to advance the understanding of cutting performance. TiAlN and diamond coatings were used to reveal the wear mechanisms. Infrared camera was used to capture the cutting temperature of tool and produced chip as well as wear types were identified by SEM/EDS analysis. As a result, good surface quality of machined surface was obtained, associated with burrs generated on the margin along laminating direction. TiAlN coating exhibited a superior cutting performance and wear resistance compared with diamond-coating, which on the other hand showed a better chip removal process but was suffered from the thermo-chemical wear significantly.