Temat: chatter - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The search for weak elements affecting the vibrostability of the system consisting of the machine tool and the cutting process, based on symptoms observed during operation
Poszukiwanie słabych ogniw w systemie obrabiarka-proces skrawania ze względu na jego wibrostabilność, na podstawie symptomów eksploatacyjnych
Autorzy:: Chodźko, M.
Powiązania:: https://bibliotekanauki.pl/articles/258071.pdf
Data publikacji:: 2015
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:: machine tool
modal analysis
chatter
stability
obrabiarka
analiza modalna
drgania chatter
stabilność
Opis:: The paper presents a methodology for the search of a “weak element” in the mass-damper-spring system of the machine tool under operating conditions, using experimental modal analysis. The subject matter of this ressearch was inspired by specific machining problems that occured in the industrial operation machine tolls. It became necessary to identify the reasons of the loss of stability, establish the self-excited vibrations mechanism, indicate the “week element” in the mass-spring-damping system, then specify the required changes in design, and verify them in practice. Athe paper also presents examples showing effectiveness of the proposed research method.
W artykule przedstawiono metodologię poszukiwania „słabego ogniwa” w dynamicznym systemie, składającym się z obrabiarki oraz procesu skrawania, z użyciem metod eksperymentalnej analizy modalnej. Prace te zostały zainspirowane koniecznością rozwiązania rzeczywistych problemów obróbkowych, które miały miejsce w przemysłowej eksploatacji obrabiarek różnego typu. Koniecznym stało się zidentyfikowanie przyczyn utraty stabilności obróbki oraz wskazanie „słabego ogniwa” w układzie masowo-dyssypacyjno-sprężystym obrabiarki. W konsekwencji określono zakres wymaganych zmian konstrukcyjnych oraz zweryfikowano ich skuteczność. W artykule wykazano również praktyczną efektywność zaproponowanej metodyki prowadzenia badań obrabiarek.
Źródło:: Problemy Eksploatacji; 2015, 1; 5-23
1232-9312
Pojawia się w:: Problemy Eksploatacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Chatter In Cutting Processes
Autorzy:: Rusinek, R.
Warmiński, J.
Powiązania:: https://bibliotekanauki.pl/articles/971228.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
cutting process dynamics
Opis:: Vibrations during a cuttting process are analysed by means of a frictional and a regenerative model. For this purpose a new model which contains a nonlinear friction force, defined by Rayleigh's self-excitation, is developed. Then a one degree of freedom model is examined using analytical and numerical methods. The regenerative model of cutting is separately examined in order to emphasize differences between frictional and regenerative models. Next, a mutual interaction of frictional and regenerative effects is discussed and their influence on process stability is shown. Finally, a two degree of freedom frictional model with an extra centrifugal force is investigated. Various kinds of behaviour, from regular to chaotic are shown.
Źródło:: Journal of Machine Engineering; 2009, 9, 1; 41-49
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Identification of dynamic cutting force coefficients by direct measurement of cutting forces during vibratory cutting
Autorzy:: Jemielniak, K.
Nejman, M.
Sniegulska-Gradzka, D.
Powiązania:: https://bibliotekanauki.pl/articles/99837.pdf
Data publikacji:: 2016
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
cutting force
modelling
Opis:: This paper presents the methodology of measuring the instantaneous cutting forces during vibratory cutting. It is based on elastically supported dynamometer vibrating with the tool during chatter. Acceleration of the dynamometer measured simultaneously allows for evaluation and elimination of inertia forces acting on the oscillating dynamometer. Displacements of the dynamometer and the tool in the feed direction during orthogonal cutting are measured by the contactless inductive sensor. The measurements allow for determination of averaged or instantaneous dynamic cutting force coefficients and their dependence on cutting conditions.
Źródło:: Journal of Machine Engineering; 2016, 16, 3; 47-57
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Stability analysis in milling based on operational modal data
Autorzy:: Powałka, B.
Chodźko, M.
Jemielniak, K.
Powiązania:: https://bibliotekanauki.pl/articles/99831.pdf
Data publikacji:: 2011
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: milling
chatter
operational modal analysis
Opis:: Prediction of process stability in milling is usually based on experimental frequency response functions of machine tool and cutting force model. Alternatively, operational modal analysis may be applied for the prediction of a stability diagram. It does not require modal impact test but uses vibration signal acquired during actual cutting to identify modal parameters. Such an approach considers boundary conditions that may be different during cutting. On the other hand synthesis of frequency response function is not feasible due to the lack of scaled modal residues. Thus, in this paper modal mass obtained by means of impact test is used to calculate frequency response functions. Estimation of modal damping and natural frequency is carried out using only acceleration signals measured during flexible workpiece machining.
Źródło:: Journal of Machine Engineering; 2011, 11, 4; 70-77
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of linear feed drive controller setting in CNC turning lathe on the stability of machining
Autorzy:: Grau, Jan
Sulitka, Matej
Soucek, Pavel
Powiązania:: https://bibliotekanauki.pl/articles/100033.pdf
Data publikacji:: 2019
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
ball-screw
feed drive
Opis:: The paper deals with the influence of linear feed drive controller setting of a CNC turning lathe on the stability of machining. A coupled simulation model of feed drive control and ball screw drive mechanics with a transmission belt was created and validated by the feed drive diagnostic measurements. The influence of drive control on the overall dynamic compliance at the TCP and the limits of stable depth of cut was examined. Impact of the feed drive actual kinematics configuration on the stability limits was studied as well.
Źródło:: Journal of Machine Engineering; 2019, 19, 2; 18-31
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: In-process control with a sensory tool holder to avoid chatter
Autorzy:: Bleicher, F.
Schörghofer, P.
Habersohn, C.
Powiązania:: https://bibliotekanauki.pl/articles/100160.pdf
Data publikacji:: 2018
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: adaptive control
condition monitoring
chatter
Opis:: Hydro-, steam- and gas- turbines, aircraft components or moulds are milled parts with complex geometries and high requirements for surface quality. The production of such industry components often necessitates the use of long and slender tools. However, instable machining situations together with work pieces with thin wall thickness can lead to dynamic instabilities in the milling processes. Resulting chatter vibrations cause chatter marks on the work piece surface and have influence on the tool lifetime. In order to detect and avoid the occurrence of process instabilities or process failures in an early stage, the Institute for Production Engineering and Laser Technology (IFT) developed an active control system to allow an in-process adaption of machining parameters. This system consists of a sensory tool holder with an integrated low cost acceleration sensor and wireless data transmission under real time conditions. A condition monitoring system using a signal-processing algorithm, which analyses the received acceleration values, is coupled to the NC- control system of the machine tool to apply new set points for feed rate and rotational speed depending on defined optimisation strategies. By the implementation of this system process instabilities can be avoided.
Źródło:: Journal of Machine Engineering; 2018, 18, 3; 16-27
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Multiple regenerative effect governing chatter behaviour after onset
Autorzy:: Sato, H.
Powiązania:: https://bibliotekanauki.pl/articles/99970.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tools
chatter
vibration
regenerative effect
Opis:: Chatter is the self-excited vibration that occurs during cutting. The entire structure of a self-excited vibration comprises two core mechanisms, i.e., stability limit and sustained vibration with finite amplitude after onset. The latter mechanism remained unnoticed until the discovery of the multiple regenerative effect (MRE) in 1980. However, its effects have not yet been recognized correctly. This paper summarizes the problems that could be resolved by considering the MRE in the analysis from the theoretical and practical viewpoints. In conventional stability limit analyses,tool traces never intersect; however, after the onset of chatter in an actual system, traces immediately intersect. This resultsin tool-workpiece separation, chip thickness variation during the separation period, and chip breakage. A solution for equation of motion considering the MRE agrees well with chatter behaviour in actual applications. In addition, the solution yields the phase relationship between the displacement of work motion and the cutting force, although this relationship is not considered in the equation of motion. Further, the relationship between the penetrating cutting speed and the resistive force, confirmed experimentally, is introduced in equation of motion, which verifies the widening of the stability region at low cutting speeds.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 51-76
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Fundamental issues in self-excited chatter in grinding
Autorzy:: Entwistle, R.
Stone, B.
Powiązania:: https://bibliotekanauki.pl/articles/99440.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
grinding
vibration
contact stiffness
regeneration
Opis:: The modelling of chatter in grinding is more complex than for metal cutting. This is because the number of parameters that influence the onset of chatter in grinding is daunting. Also, unlike metal cutting, the growth of chatter in grinding may take a significant time and so growth rates are also important. Initially the modelling of grinding chatter was simply an extension of that already developed for metal cutting. However this was soon found to be inadequate and the models were increased in complexity to include improved grinding force models the contact stiffness of the wheel and regeneration of surface waves on both the work and wheel. Some solutions to chatter in grinding were also proposed. Most notably these included the use of varying speed and flexible grinding wheels. This position paper re-visits the almost universal assumption that grinding chatter is always regenerative. It is shown that a grinding force model for oscillating conditions, that has been experimentally confirmed, indicates that both torsional vibration and non-regeneration need to be considered. The consequences for current methods of chatter elimination are discussed.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 26-50
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analytical time-domain model for tool point dynamics in turning
Autorzy:: Berglind, L.
Ziegert, J.
Powiązania:: https://bibliotekanauki.pl/articles/99687.pdf
Data publikacji:: 2014
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
turning
analytical model
time domain
Opis:: An analytical time domain solution is developed to model the dynamic response of a tool during a simple turning operation. The time domain solution developed in this paper relies on the superposition principal under the linear assumption to construct the time response of single mode, single degree of freedom cutting tool. The results from the analytical solution are compared with those generated using numerical time domain simulations and it is found that the two solutions converge as the time step used in the numerical simulation decreases.
Źródło:: Journal of Machine Engineering; 2014, 14, 4; 75-94
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Position paper - fundamental issues in self-excited chatter in turning. Appendix – research into process damping by Altintas et al
Autorzy:: Ito, Y.
Powiązania:: https://bibliotekanauki.pl/articles/100059.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: turning
cutting
parametric vibration
chatter
stability
Opis:: Although observing a considerable number of new interesting behavior in dynamic states of machining, nearly all researches into the chatter vibration have been based on those conducted by Tobias, Tlusty and Merritt. In fact, we have established myriad remedies for the chatter suppression on the strength of their achievements; however, some crucial issues remain still in uncertainties, e.g., validity of penetration effects, definition duly what are the essential features of the chatter vibration. This position paper describes the facing problems of the chatter vibration in detail, aiming at the establishment of a generalized chatter loop. By this chatter loop, we may unveil synthetically the deterioration and improvement of the stability chart by all the influencing attributes, such as forced vibration and non-linearity within the machine-tool-work system.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 7-25
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Improving machining performance against regenerative tool chatter through adaptive normal pressure at the tool clamping interface
Autorzy:: Fu, Q.
Rashid, A.
Nicolescu, C. M.
Powiązania:: https://bibliotekanauki.pl/articles/99845.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
tool
internal turning
vibration
clamping
damping
interface
Opis:: Chatter in machining process is one of the common failures of a production line. For a cantilever tool, such as a boring bar, the rule of thumb requires the overhang length of the tool to be less than 4 times the diameter. The reason is because longer overhang will induce severe tool vibration in the form of chatter during machining. When a longer overhang than 4 times diameter is necessary for performing special machining operations, damping methods are needed to suppress tool chatter. One of the methods is the constrained layer damping method. Materials, such viscoelastic material, are applied in the vibration node regions of the structure to absorb the concentrated vibration strain energy and transform the mechanical energy to heat. With a cantilever tool clamped in a tool holder, the clamping interface is usually the vibration node region. The friction in the joint interface with low normal pressure became another source of damping and can be used for tool chatter suppression in mechanical structures. Joint interfaces are well known to possess normal pressure dependent stiffness and damping. The normal pressure's effect on the structures frequency response function had been observed by H. Akesson [1] et al, and L.Mi [2] et al. However, the direct effect of the joint interface normal pressure on machining process stability hasn't been investigated. In this paper, a cantilever tool with 6,5 overhang length to diameter ratio is investigated. The direct effect of the tool clamping interface's normal pressure on the machining process stability is studied. Three different levels of clamping normal pressure are tested with an internal turning process. The machining results indicate another adaptable solution on shop floor for suppressing tool chatter.
Źródło:: Journal of Machine Engineering; 2013, 13, 1; 93-105
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: A method of identification of complex cutting forces acting in unstable cutting process
Autorzy:: Bach, P.
Polacek, M.
Chvojka, P.
Burian, D.
Drobilek, J.
Powiązania:: https://bibliotekanauki.pl/articles/99872.pdf
Data publikacji:: 2014
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: chatter
stability inaccuracy
complex cutting forces
forces identification
Opis:: The calculations of machining stability limit currently known do not provide a precise prediction of chatter-free cutting conditions. The inaccuracy is probably caused by mathematical models of dynamic forces acting on the cutting process during unstable machining. These models need to be modified. A new analysis of experimental data measured by one of the authors, M. Poláček, in the 1968-1974 period, forecasted an existence of several dynamic forces, which are mutually phase-shifted, thus complex. This fact has not been thoroughly investigated previously. As the assumed forces cannot be calculated from any equations, they must be identified experimentally. This research paper proposes a theoretical method of an experimental identification of these forces. The new model is intended to be used in the future for the development of a more accurate calculation of stability diagram.
Źródło:: Journal of Machine Engineering; 2014, 14, 4; 18-28
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Application of the finite element method in the milling process stability diagnosis
Autorzy:: Dunaj, Paweł
Marchelek, Krzysztof
Chodźko, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/279318.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: chatter
finite element modelling
modal analysis
machine tool
Opis:: The article presents results of both experimental and FEM model-based investigations on chatter phenomena that occur in the end milling process. On the basis of chatter symptoms observed during machining, the mechanism of its occurrence has been identified. Then, a FEM model has been built to indicate machine tool elements responsible for loss of stability. Afterwards, experimental modal analysis has been conducted in order to validate the FEM model. Finally, on the basis of the validated model, the structural changes have been proposed and applied in the real object resulting in increased stability.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 353-367
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Analysis of chattering phenomenon in industrial S6-high rolling mill
Autorzy:: Valigi, M. C.
Papini, S.
Powiązania:: https://bibliotekanauki.pl/articles/329438.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: chatter
vibration analysis
S6-high rolling mill
Opis:: Chatter in rolling mills is the undesirable vibration observed in most of the rolling mills operating at high speed and rolling thin strip. In this work the authors discuss some problems relative to the vibrations occurring in a S6-high cold rolling mill. It can result in not good surface finish for some applications and, rare cases, in gauge variations in the rolled strip and it is considered to be the result of interaction between rolling mill structure and rolling-process. Three basic types of chatter can be classified in rolling mills: torsional, third-octave mode, and fifth-octave-mode chatter. S6-high rolling mill is an innovative mode to work the steel: it allows the use of very small work rolls laterally guided by individually adjustable side support rolls, which are supported by two rows of roller bearings mounted in cassettes. It has six rolls able to roll steel strip coming directly from hot rolling mill train. A proposed solution based on empirical observations, vibration analysis and considerations of a model is described with the aim to improve the quality of the product and increasing production.
Źródło:: Diagnostyka; 2013, 14, 3; 3-8
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Characterization of band sawing based on cutting forces
Autorzy:: Thaler, T.
Bric, I.
Bric, R.
Potocnik, P.
Muzic, P.
Govekar, E.
Powiązania:: https://bibliotekanauki.pl/articles/99509.pdf
Data publikacji:: 2012
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: band sawing
cutting forces
condition monitoring
tool wear
chatter
Opis:: Band sawing is one of the most efficient methods for which in general it is known that uneven tool wear, chatter and cutting blade defects can affect cutting performance significantly. A data acquisition system was arranged on an industrial band saw machine in order to characterize the band sawing process based on measurements of forces. In this paper, the cutting force signals are analyzed in order to demonstrate important relations to workpiece and cutting blade properties. It is shown that cutting forces contain information about in homogeneity of a cut workpiece. Signals of cutting forces also reveal important properties of blade geometry that is related to uneven blade wear. Discontinuities such as blade welding are clearly evident in force signals and it is shown that unevenness of blade backing geometry can cause a significant variation in forces due to wedging between the workpiece and a blade support. An original method for blade shape extraction from force signals is presented in detail. Paper also reports on chatter phenomena observed at specific cutting conditions. Possible solutions to the addressed problems and phenomena are discussed in the conclusion.
Źródło:: Journal of Machine Engineering; 2012, 12, 1; 41-54
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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