Purpose The purpose of this paper is to determine the influence of the shape of a cutting edge on high-performance milling high-performance cutting. The main purpose of the test was to determine the possibility of increasing the efficiency of machining AlZn5.5CuMg alloy, which is used mainly for the thin-walled structural aerospace components. Design/methodology/approach In all, eight cutters for machining aluminum alloys with different shape of the cutting edge (1 – continuous, 4 – interrupted, 3 – wavy) were tested. The influence of different shapes of a cutting edge on cutting force components and vibration amplitude was analyzed. Furthermore, the impact of a chip breaker on the form of a chip was determined. Findings The conducted test shows that using discontinuous shapes of a cutting edge has impact on the reduction of the cutting force components and, in most cases, on the increase of vibration amplitude. Moreover, using a chip breaker caused significant chip dispersion. The optimal shape of a cutting edge for cutting AlZn5.5CuMg alloy is fine wavy shape. Practical implications Potential practical application of the research is high-performance milling of AlZn5.5CuMg alloy, for example, production of thin-walled aerospace structural components. Originality/value Different shapes of a cutting edge during high-performance milling of aluminum alloy were tested. The influence of tested geometries on HPC process was determined. The most favourable shape of a cutting edge for high-performance cutting of AlZn5.5CuMg alloy was determined.
Purpose The purpose of this paper is to determine the influence of a toroidal cutter axis orientation and a variable radius of curvature of the machined contour of sculptured surface on the five-axes milling process. Simulation and experimental research performed in this work are aimed to determine the relationship between the parameters of five-axes milling process and the shape and dimensional accuracy of curved outline of Inconel 718 alloy workpiece. Design/methodology/approach A subject of research are sculptured surfaces of the turbine blade. Simulation research was performed using the method of direct mapping tools in the CAD environment. The machining research was carried out with the use of multi-axis machining center DMU 100 monoBLOCK DMG, equipped with rotating dynamometer to measure the components of the cutting force. To control the shape and dimensional accuracy, the coordinate measuring machine ZEISS ACCURA II was used. Findings In this paper, the effect of the toroidal cutter axis orientation and the variable radius of curvature of the machined contour on the parameters of five-axes milling process and the accuracy of the sculptured surfaces was determined. Practical implications Five-axes milling with the use of a toroidal cutter is found in the aviation industry, where sculptured surfaces of the turbine blades are machined. The results of the research allow more precise planning of five-axes milling and increase of the turbine blades accuracy. Originality/value This paper significantly complements the current state of knowledge in the field of five-axes milling of turbine blades in terms of their accuracy.
The article presents the results of experimental studies in high performance milling of AlZn5.5MgCu aluminum alloy. The tests were performed with the use of end mill cutters with different serrated shapes of the cutting edge. End mills with continuous, interrupted and wavy with varied profile radius were used. The tests were conducted on a DMG's DMU 100 MonoBlock machining center with cutting force components measurement in workpiece system capabilities. The experimental tests were carried out using varied radial depth of cut ae and feed per tooth fz parameters according to applied three-level full design of experiment. The relationships between ae and fz parameters and cutting force components for various cutting edge shapes were determined. A continuous cutting edge was adopted as a reference shape. Based on the results of the tests, cutting force components models for analyzed cutting edge shapes were determined. A comparative analysis between the developed models and relationships was conducted. The study proved that when adopting end mills with serrated cutting edges, lower cutting force components are obtained, in comparison with cutters with continuous cutting edges. The results also showed that for end mills with serrated cutting edges radial depth of cut ae has a negligible influence on the feed force component Ff. The results proved, that end mills with serrated cutting edges should be used in high performance machining, where high values of ae and fz parameters are adopted. Furthermore, machining of thin-walled workpieces can be a potential application of these end mills, as lower values of cutting force components reduce the risk of deformation of milled thin walls.
StreszczenieZaprezentowano wyniki badań wpływu zmiany zarysu linii ostrza frezu palcowego na przebieg skła-dowych sił skrawania podczas wysokowydajnego frezowania stopu aluminium AlZn5.5MgCu. Badano następujące zarysy linii ostrza: sinusoidalny ciągły, przerywany o zarysie trapezowym, prostokątnym, okrągłym i trójkątnym. Słowa kluczowe: wysokowydajna obróbka, stopy aluminium, siły skrawania, zarys linii ostrza THE INFLUENCE OF THE CUTTER EDGE CONTOUR LINE ON THE CUTTING FORCES IN THE HIGH PERFORMANCE CUTTING OF AlZn5.5MgCu ALUMINUM ALLOY. AbstractIn the paper there will be presented research results of the influence of cutter edge contour line on the values of cutting force components in the high-performance cutting AlZn5.5MgCu alloy. There were used the following cutting edge contour lines: sinusoidal continuous and interrupted: trapezoidal, rectangular, circular and triangular.
Proces szlifowania stosuje się nie tylko w obróbce wykoń-czeniowej ale również jako obróbkę zgrubną dla materiałów trudnoskrawalnych. Efekt końcowy szlifowania zależy od wielu różnych, trudnych do zmierzenia parametrów procesu. Jednym z nich jest stan zużycia ściernicy. Może on powodować błędy w procesie szlifowania, takie jak przypalenia szlifierskie lub powodować wystąpienie drgań typu chatter. Można temu zapobiec monitorując stan procesu. Większość istniejących obecnie systemów jest skomplikowana w zastosowaniach przemysłowych. Wymaga zwykle montażu czujnika niedaleko strefy obróbki. Celem niniejszej pracy badawczej jest opracowanie systemu diagnostycznego dla procesu szlifowania z posuwem pełzającym (creep feed grinding) z zastosowaniem łatwo mierzalnego parametru procesu. Jako sygnał diagnostyczny wykorzystano dźwięk generowany podczas procesu. W artykule przedstawiono możliwość wykorzystania sygnałów audio rejestrowanych podczas procesu do monitorowania stanu ściernicy. SŁOWA KLUCZOWE: szlifowanie, monitorowanie, CFGThe grinding process is used not only in finishing operations but also as a roughing difficult-to-cut materials. The end grinding effects is dependent on a variety of difficult to measure process parameters. One of them is the condition of the grinding wheel wear. It can cause errors in the grinding process, such as grinding burns or cause the occurrence of chatter vibration type. This can be prevented by monitoring the state of the process. Most of the existing systems is complicated for industrial applications. It usually requires mounting the sensor near the machining area. The purpose of this research is to develop a diagnostic system for the Creep Feed Grinding process (CFG) using easily measurable parameter of the process. The sound produced during the process was used as a diagnostic signal. The article presents the possibility of using audio signals registered during the process to monitor the state of the grinding wheel. KEYWORDS: grinding monitoring, CFG WprowadzenieSzlifowanie jako operacja końcowa decyduje o przydatności przedmiotu obrobionego. Błędy na tym etapie produkcji są z reguły bardzo kosztowne. Wynik końcowy szlifowania zależy od wielu różnych, trudnych do zmierzenia parametrów procesu. Osiągnięcie wymaganej jakości obróbki w okresie trwałości ściernicy skutkuje z reguły nadmierną ostrożnością w doborze parametrów obróbkowych. Z tego to powodu obciąganie ściernicy wykonuje się wcześniej niż wymagał by tego jej stan rzeczywisty. Powoduje to przyśpieszone zużycie ściernicy oraz zmniejsza efektywnośc procesu. Efekt ten jest szczególnie widoczny w szlifowaniu CFG gdzie ze względu na znaczne naddadki obróbkowe osiagające wartości rzędu mm oraz rodzaj stosowanych ściernic zużycie ściernicy jest szczególnie intensywne. Z kolei stan czynnej powierzchni ściernicy ma decydujący wpływ na jakość powierzchni obrabianego przedmiotu. Niestety uzyskaną w procesie szlifowania jakość przedmiotu można określić dopiero po jego zakończeniu. Sytuację pogarsza fakt, że w zależności od warunków pr...
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