No abstract

Inconel 718 alloy exhibits high strength and creep-rupture strength at high temperatures. These properties are heavily influenced by heat treatment. Machining, especially milling of this alloy is very difficult because of the high strength and hardness at high temperature. Self-hardening is one of the problems, which leads to enormous tool wear. Productivity of machining is relatively low. This paper is focused on the factors which have the greatest effect on the cutting tool wear and the machined surface quality when the Inconel 718 is machined. There is a description of these factors and their explanations. The experiment for comparing three different cutting tool materials is described. The experiment is also focused on the confirmation of the theoretical information.

This work deals with the problematics of cutting forces when drilling holes in Inconel 718. Drills with different geometries of cutting edge were used. The cutting forces and torques were measured during the experiment. The feed cutting force had the greatest influence of all the cutting forces, therefore only the cutting force feed was evaluated. The torque was monitored. This material is known for its unique properties of high strength at high temperatures, corrosion resistance, high hardness, work hardening and low thermal conductivity. Part of the paper is focused on the experiment where the effects of the geometry of the cutting edge on cutting forces are evaluated. This paper is limited only to carbide tools. The results of the experiment are compared with results from other research institute.

This work deals with the problematics of drilling holes in Inconel 718. This material has found applications especially in the aerospace industry and in other demanding applications due to its characteristic properties. Its special properties are high strength at high temperatures, corrosion resistance, low thermal conductivity, high hardness and work hardening. Even using modern technologies, the machining of this material is a problem. These problems are partially described in this paper. The drilling of this material is a topical subject and therefore modern approaches are used for this operation. This paper is limited only to carbide tools. The second part of the paper is focused on the experiment where the effects of the geometry of the cutting edge on cutting tool life are evaluated. The results of the experiment are compared with results from other research institutes.

This article is focused on the influence of the work environment and values of cutting conditions on tool wear in machining of nickel -based super alloys. These materials are popular in the aerospace industry and in other demanding applications, due to their excellent mechanical properties. Machining of these materials brings many problems mainly due to their high strength at high temperatures, low thermal conductivity, high hardness and work hardening. Therefore it is necessary to reduce the influence of these factors on the tool, for example by changing the cutting conditions or optimization of cutting environment. The problems with the machining of these super alloys are described. The next part is focused on the experiment where the cutting process and cutting tool wear were evaluated. For the test a milling cutter with indexable inserts was used. During the test the cutting speed and feed rate was changed.