Tooling Structure: Interface between Cutting Edge and Machine Tool

Rivin, Eugene I.; Agapiou, John S.; Brecher, Christian; Clewett, M.; Erickson, R. Barry; Huston, F.; Kadowaki, Yoshitsugu; Lenz, E.; Moriwaki, Toshimichi; Pitsker, A.; Shimizu, Sakayu; Schulte, Thorolf; Schulz, Markus; Smith, K.S.; Tsutsumi, Masaomi; Ulsoy, A. Galip; Weck, Manfred; Yokoyama, Kazuo

doi:10.1016/s0007-8506(07)63457-x

Cited by 76 publications

(40 citation statements)

References 28 publications

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“…Celem podstawowym wprowadzenia dodatkowej powierzchni kontaktu w złączach opartych o stożek 7:24 jest zredukowanie lub wyeliminowanie wad występujących głównie przy obróbce z dużymi prędkościami obrotowymi. Podstawowymi zaletami złączy 7:24 z dodatkową powierzchnią kontaktu są [5,10]:…”

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The influence of the 7:24 interface’s modification on the machining process’ physical and technological effects

Nowakowski

2015

Mechanik

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StreszczeniePrzedstawiono porównanie klasycznego złącza o zbieżności 7:24, stosowanego we wrzecionach obrabiarek, z jego modyfikacją, pozwalającą na uzyskanie dodatkowej powierzchni kontaktu. Dla dwóch przypadków -oprawki z narzędziem trzpieniowym oraz trzpienia z narzędziem nasadzanym -przeprowadzono analizę statyczną ugięcia oraz sztywności w kierunku promieniowym. Wykonano również próby frezowania obwodowego i czołowego. Obrobione powierzchnie posłużyły do oceny parametrów chropowatości uzyskanych w różnych warunkach połączenia narzędzia z obrabiarką. Słowa kluczowe: skrawanie, złącza obrabiarkowe, sztywność statyczna, chropowatość powierzchni THE INFLUENCE OF THE 7:24 INTERFACE'S MODIFICATION ON THE MACHINING PROCESS' PHYSICAL AND TECHNOLOGICAL EFFECTS AbstractThe paper presents the comparison of typical 7:24 interface with its modification, which allows to the obtainment of the additional contact surface. For the two cases: toolholder with the slot tool and pivot with cutter, the analysis of static deflection and stiffness in radial direction was carried out. The cylindrical and face milling tests were also conducted. The machined surfaces were valuated in the aspect of surface roughness parameters obtained in different interface conditions.

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“…Już przy prędkości n=10 000 obr/min, pod wpływem działania siły odśrodkowej stożek ulega rozszerzaniu, znacznie zmniejszając powierzchnię kontaktu pomiędzy uchwytem a wrzecionem [7]. Wrzeciono ze stożkiem SK30, podczas pracy z prędkością n=40 000 obr/min rozszerza się o 4-5 μm [5].…”

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The influence of the 7:24 interface’s modification on the machining process’ physical and technological effects

Nowakowski

2015

Mechanik

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“…The static stiffness of the boring bar body can be increased by using materials with higher Young's modulus. A boring bar made of tungsten carbide can be used up to a L/D ratio of approximately 7 [1].…”

Section: Introductionmentioning

confidence: 99%

Development and Optimization of Vibration-Damped Tool Holders for High Length-to-Diameter Boring Operations

Sørby¹

2016

High Speed Machining

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When the length-to-diameter ratio of a boring bar becomes too high, the vibration problem becomes excessive. This paper discusses the design and optimization of tuned mass dampers (TMDs) for vibration-damped boring bars. A typical TMD for a boring bar consists of a high-density mass, rubber elements, and viscous damping fluid. The TMD is mounted as close to the free end of the boring bar as possible for maximizing the damping effect. The different tuning strategies are related to the different types of vibrations that are observed in machining operations. It is shown that the classical tuning with minimized magnitude of the frequency response function will give the shortest settling time for free vibrations, while tuning for maximized negative real part of the frequency response function will give the highest resistance to regenerative chatter. For suppressing regenerative chatters, the internal damping in the material in the boring bar body is of minor importance for boring bars with TMDs, but of high importance for conventional undamped boring bars. The paper presents design solutions for TMDs in boring bars.

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“…Altintas and Weck [8] have contributed a comprehensive review to the fundamental modelling of chatter vibrations and the associated chatter stability lobes for the four metal cutting and grinding processes. Efforts have also been made to improve the prediction accuracy of the chatter stability by taking into account of various factors which are probably encountered in practice, for example the influence of structural interfaces on the dynamic stiffness of the machine [9], the mode-coupling effect [10], the feed speed variation [11] and the effect of noise excitation [12]. In addition, particular attentions have been paid to the vibration response of machine tool because monitoring the vibration frequencies during machining is an efficient way for identifying machine tool chatter and distinguishing between different types of instabilities [13].…”

Section: Introductionmentioning

confidence: 99%

Effects of bearing clearance on the chatter stability of milling process

Peng

Jackson

Guo

et al. 2010

Nonlinear Analysis: Real World Applications

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Abstract:In the present study, the influences of the bearing clearance, which is a common fault for machines, to the chatter stability of milling process are examined by using numerical simulation method. The results reveal that the presence of bearing clearance could make the milling process easier to enter the status of chatter instability and can shift the chatter frequency. In addition, the spectra analysis to vibration signals obtained under the instable milling processes show that the presence of bearing clearance could introduce more frequency components to the vibration responses but, however, under both the stable and instable milling processes, the generated frequency components will not violate the ideal spectra structures of the vibration responses of the milling process, which are usually characterized by the tooth passing frequency and its associated higher harmonics for the stable milling process and by the complex coupling of the tooth passing frequency and the chatter frequency for the instable milling process. This implies that, even under the case with bearing clearance fault, the stability of the milling process can still be determined by viewing the frequency spectra of the vibration responses. Moreover, the phenomena of the chatter frequency shift and the generation of more components provide potential ways to detect the bearing clearance in machines.

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Tooling Structure: Interface between Cutting Edge and Machine Tool

Cited by 76 publications

References 28 publications

The influence of the 7:24 interface’s modification on the machining process’ physical and technological effects

The influence of the 7:24 interface’s modification on the machining process’ physical and technological effects

Development and Optimization of Vibration-Damped Tool Holders for High Length-to-Diameter Boring Operations

Effects of bearing clearance on the chatter stability of milling process

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