Jarosław Buk

Zastosowanie systemu Omative w obróbce łopatki turbiny ze stopu Inconel 718

The modern aviation industry is increasingly demanding its components, while striving for maximum efficiency and maximum profit. New construction solutions make it necessary to use special materials such as heatresistant super alloys. These are alloys based on nickel, cobalt or iron. Of these, one of the best properties is Inconel 718 [1, 2]. The advantages of this alloy are particularly important in those engine points that are subjected to the largest loads. The turbine blades work in the most difficult temperature and load conditions. The blade end speed reaches 390 m/s, the gas temperature is even 1200 °C and their speed is 600 m/s. The turbine blade material, in addition to high strength, must be characterized by high heat resistance, high temperature creep resistance, corrosion and oxidation resistance and high hardness. Density of the alloy, which affects the weight of the engine, is also important in generating centrifugal forces [3, 4]. Inconel 718 is one of the hardest materials to work on. Blade locks are currently being successfully developed in the Creep-Feed Grinding (CFG) process. This method allows for efficient machining of elements made of super alloys and other hard-working materials. It allows the parts to be polished after heat treatment and ensures high surface quality [5]. On the other hand, in the case of free surfaces of the blades, the method of their execution is simultaneous process of five-axes milling. Due to the complexity of this machining, the presence of high milling strength components and the high cost of the workpiece and tooling, it is legitimate to use a system that monitors the correctness of the cutting process. They are based on the measurement of selected physical quantities, such as: cutting force, vibration, power and engine torque, sound emission or coolant flow. Measured signals (after processing) serve to obtain process measures

Programowanie obróbki wiertła stopniowego pełnowęglikowego z wykorzystaniem systemu MTS

In the aerospace and automotive industries, progressive carbide step drills are commonly used. Appropriate tool geometry including the shape of the flute, the number of teeth and their type, and especially variant of the drill correction used has a significant influence on the drilling parameters. These parameters determine the drilling power, temperature, chip evacuation and tool life. Therefore, to obtain the right drill geometry is so important at the design stage. For this reason, we are constantly looking for the right macro and microgeometry of the drill, adapted to the required machining conditions. The paper presents the process of programming the exemplary step drill geometry and its machining process using the MTS system [1, 2, 3, 4, 5].

Measurements of the blade’s fir tree slots profile deviation on conturograph

* Dr hab. inż Jan Burek, prof. PRz (jburek@prz.edu.pl), mgr inż. Jarosław Buk (jbuk@prz.edu.pl), mgr inż. Marcin Płodzień (plodzień@prz.edu.pl), mgr inż. Paweł Turek (pturek@prz.edu.pl), mgr inż. Marcin Sałata (msalata@prz.edu.pl) – Katedra Technik Wytwarzania i Automatyzacji, Wydział Budowy Maszyn i Lotnictwa, Politechnika Rzeszowska Pomiar odchyłki profilu zamka łopatki wirnika na konturografie