High speed process damping in milling

Sellmeier, Volker; Denkena, Berend

doi:10.1016/j.cirpj.2011.12.001

Cited by 42 publications

(13 citation statements)

References 23 publications

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“…For a more accurate temperature measurement, the backside is coated with an emissivity spray. [5]. During the milling operation, the axial and radial depth of cut ap and ae, respectively, have constant values (see Table 1).…”

Section: 1experimental Setupmentioning

confidence: 98%

“…Andrew and Tobias stated that if with every following cut the amplitude of the chip thickness is increasing due to the regenerative effect, the machining process becomes unstable [4]. Tools with cutting edges, which have chamfers on their flank face, are used to increase the process stability [5]. This chamfered areas come into contact with the just cut wavy surface of the workpiece leading to an additional force component known as process damping forces [6].…”

Section: Introductionmentioning

confidence: 98%

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Influence of Machining Parameters on Heat Generation During Milling of Aluminum Alloys

et al. 2016

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Thin-walled components, i.e. fuselage frames of airplanes, are prone to an unstable process behavior during milling. Therefore, tools with a chamfer between the cutting edge and the flank face are often used for such machining tasks. During milling, the chamfered area comes into contact with the just cut surface. This contact leads to process damping forces and the induced heat into the workpiece in this contact zone is increased. Furthermore, the amount of induced heat depends on the process parameters. At certain spots on the machined surface this may lead to a local overheating, which can reduce stiffness significantly. When this occurs during milling of a thin-walled component, the component is often regarded as reject. In this paper, the influence of chamfers and process parameters on the induced heat into the workpiece is investigated experimentally. In addition, a simulation which predict the temperature in the workpiece in dependence of the process parameters is presented.

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Section: 1experimental Setupmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Influence of Machining Parameters on Heat Generation During Milling of Aluminum Alloys

et al. 2016

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“…Znanych jest wiele metod przeciwdziałania drganiom samowzbudnym [7,8,9,10]. Począwszy od metod bardziej wyrafinowanych jak stosowanie aktuatorów, czy pulsacja prędkości obrotowej, po bardziej tradycyjne -zwiększenie posuwu, zmniejszenie prędkości obrotowej.…”

Section: Wprowadzenieunclassified

The comparison of dynamic cutting force coefficients measured during self-excited vibrations for sharp and worn cutting edge

Nejman¹,

Śniegulska-Grądzka²

2015

Mechanik

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PORÓWNANIE DYNAMICZNYCH WSPÓŁCZYNNIKÓW SIŁ SKRAWANIA ZMIERZONYCH W CZASIE WYSTĘPOWANIA DRGAŃ SAMOWZBUDNYCH DLA OSTREJ I ZUŻYTEJ KRAWĘDZI SKRAWAJĄCEJ StreszczeniePodczas doboru warunków skrawania dla danego procesu należy wziąć pod uwagę przeciwdziałanie drganiom samowzbudnym. Powszechnie przyjętą metodą unikania drgań samowzbudnych podczas skrawania jest uwzględnienie granicy stabilności wyznaczonej dla wybranego narzędzia oraz rodzaju materiału obrabianego. Niestety, ta granica przesuwa się wraz z degradacją krawędzi ostrza skrawającego. W artykule przedstawiono wpływ zużycia ostrza na wyniki pomiaru dynamicznych współczynników sił skrawania. Słowa kluczowe: drgania samowzbudne, siły skrawania THE COMPARISON OF DYNAMIC CUTTING FORCE COEFFICIENTS MEASURED DURING SELF-EXCITED VIBRATIONS FOR SHARP AND WORN CUTTING EDGE AbstractPreventing the occurrence of self-excited vibration is very important in selection of cutting conditions. Commonly accepted method of avoiding self-excited vibrations during cutting is the determination of the stability limit for selected tool and workpiece material. Unfortunately, this limit changes with the degradation of the cutting edge. This paper presents the influence of the tool wear on the measurement results of dynamic coefficients of cutting forces.

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“…The model was first derived by Wu [8] and thereafter adapted by various other authors [9][10][11][12][13]. In literature, the consideration of process-damping effects has taken place mostly for worn tools [11,13].…”

Section: Introductionmentioning

confidence: 99%

Process stability of a novel roughing-finishing end mill

Denkena

Grabowski

Krödel

et al. 2020

Prod. Eng. Res. Devel.

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In this paper, stability investigations of a novel roughing-finishing end mill are carried out. This tool possesses two sharp finishing teeth and two radially recessed, chamfered roughing teeth. By applying the same tool for roughing and finishing operations, tool changes and process time can be reduced. For the stability investigations, the semi-discretization method for calculating stability charts was extended and made applicable for the novel tool concept by taking into account the radial recession of the chamfered cutting teeth. This is necessary because the radial recession leads to varying time-delays during the tooth engagement. Stability charts were then calculated for roughing-finishing tools with different radial recession as well as for conventional finishing and roughing tools. Furthermore, experimental stability charts were created. The results show a good agreement between calculated and experimental stability charts for the finishing tool. However, the calculated stability limits of the roughing-finishing tool and the roughing tool do not met with the experimental stability limits, which is attributed to inaccuracies in the modelling of process damping. Nevertheless, calculated as well as experimental stability charts indicate a significant increase of the stability limit of the roughing-finishing tool compared to the finishing tool.

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High speed process damping in milling

Cited by 42 publications

References 23 publications

Influence of Machining Parameters on Heat Generation During Milling of Aluminum Alloys

Influence of Machining Parameters on Heat Generation During Milling of Aluminum Alloys

The comparison of dynamic cutting force coefficients measured during self-excited vibrations for sharp and worn cutting edge

Process stability of a novel roughing-finishing end mill

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