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High speed milling in thin-walled aircraft structures

Bałon Paweł, Rejman Edward, Smusz Robert, Szostak Janusz, Kiełbasa Bartłomiej

Applied Computer Science

2018

Vol. 14, no 2

82--95

Aircraft structures are designed to mainly consist of integral elements which have been produced by welding or riveting of component parts in technologies utilized earlier in the production process. Parts such as ribs, longitudinals, girders, frames, coverages of fuselage and wings can all be categorized as integral elements. These parts are assembled into larger assemblies after milling. The main aim of the utilized treatments, besides ensuring the functional criterion, is obtaining the best ratio of strength to construction weight. Using high milling speeds enables economical manufacturing of integral components by reducing machining time, but it also improves the quality of the machined surface. It is caused by the fact that cutting forces are significantly lower for high cutting speeds than for standard machining techniques.

Surface microhardening studies on steels after high feed milling

Petrů Jana, Zlámal Tomáš, Špalek František, Čep Robert

Advances in Science and Technology. Research Journal

2018

Vol. 12, no 2

222--230

The paper deals with the impact of high-speed machining production methods on the integrity of component surfaces. One has to point out that cutting conditions during machining have a significant impact on the final properties of surface and subsurface layers of the workpiece. The conclusion summarizes and analyzes the achieved results of experimental activities on stainless austenitic steel 1.4301, hardened tool steel 1.2343 and high-speed steel 1. 3344 (ASP 2023). The results of the work experimental parts demonstrate the influence of cutting parameters on selected surface integrity ones, specifically strengthening the surface and subsurface layers. The performed experiments show that microhardness of a surface layer of the machined material can be influenced by suitable cutting conditions and other cutting process parameters.

State of residual stresses after the process of milling selected aluminium alloys

Kuczmaszewski Józef, Łogin Waldemar, Pieśko Paweł, Zagórski Ireneusz

Advances in Science and Technology. Research Journal

2018

Vol. 12, no 1

63--73

The purpose of this paper was to analyse the structure and the state of residual stresses in the samples made of rolled AW-2024 and AW-7075 aluminium alloy plates, prior to machine cutting and after the process of milling under various machining conditions. The state of stresses was evaluated on the basis of measurements by means of sin2vF X-ray diffractometry and layer removal method. Furthermore, top layer microstructures were compared in half-finished product, machined product, and core material samples.