Progress in development of coated indexable cemented carbide inserts for machining of iron based work piece materials

Abstract

Abstract. Increasing demands on material properties of iron based work piece materials, e.g. for the turbine industry, complicate the machining process and reduce the lifetime of the cutting tools. Therefore, improved tool solutions, adapted to the requirements of the desired application have to be developed. Especially, the interplay of macro-and micro geometry, substrate material, coating and post treatment processes is crucial for the durability of modern high performance tool solutions. Improved and novel analytical methods allow a detailed understanding of material properties responsible for the wear behaviour of the tools. Those support the knowledge based development of tailored cutting materials for selected applications. One important factor for such a solution is the proper choice of coating material, which can be synthesized by physical or chemical vapor deposition techniques. Within this work an overview of state-of-the-art coated carbide grades is presented and application examples are shown to demonstrate their high efficiency. Machining processes for a material range from cast iron, low carbon steels to high alloyed steels are covered.

Characterization of Ceramics Coatings Processed by Sol-Gel for Cutting Tools

“…Regardless of the presence of coating on the surfaces of the insert, the authors concluded that the main reason for the poor machinabilities (flank wear) of the CGI (and NGI as well) is that the generated cutting temperatures are much higher than for the FGI. One of the main reasons to use aluminium oxide as a tool coating is because it presents a high wear resistance [3,19]. The Al 2 O 3 is characterized by excellent thermal stability, chemical inertness, relatively high hardness at elevated temperatures, and good mechanical and anti-corrosive properties [19,20].…”

“…One of the main reasons to use aluminium oxide as a tool coating is because it presents a high wear resistance [3,19]. The Al 2 O 3 is characterized by excellent thermal stability, chemical inertness, relatively high hardness at elevated temperatures, and good mechanical and anti-corrosive properties [19,20]. Nevertheless, the main properties of the TiO 2 include low cost, high stability, chemical inertness, biocompatibility, and non-toxicity [21].…”