Stability analysis in milling of flexible parts based on operational modal analysis

Powałka, B.; Jemielniak, Krzysztof

doi:10.1016/j.cirpj.2014.11.003

Cited by 27 publications

(5 citation statements)

References 15 publications

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“…Nevertheless, the location of the experimental peaks and valleys is shifted and does not match with the theoretical ones (black lobes). This occurs due to the dependence of the modal parameters on the dynamics of the spindle; actually, modal damping and natural frequencies of the system obtained from the Tap-Tests will differ from those resulting from the cutting [16]. That is to say, the ability of the system to absorb energy or damp forces will increase when the spindle is turning (cutting).…”

Section: Machining T Machining Tests Estsmentioning

confidence: 99%

Analysis of the Tool Stick-Out Influence on Machining Chatter

Albizu¹,

Arrazola²,

Ørskov³

2021

Esaform 2021

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Increased stability in machining processes is highly desired by all machining industries when vibrations and specially chatter occur. This phenomenon is defined as a self-excited vibration that occurs due to the regeneration of waviness of the workpiece surface. In machining industry, the trend is to rely on the trial and error method or mere experience when deciding the machining spindle speeds, depths of cut and tool stick-outs, all of which are parameters directly related to chatter occurrence. Currently, the shortest possible tool stick-out is chosen by default, but literature has proven that longer stick-outs may bring some advantages when it comes to material removal rates. Aiming to prove this theory, this paper will discuss the influence of the tool stick-out on machining chatter occurrence. To that end, the effect of the tool stick-out on the modal parameters of the system, on the Stability Lobe Diagram (SLD) and on productivity will be analysed. Therefore, a number of Tap-Tests to different tool/tool-holder/stick-out combinations have been performed, in order to gather the data (FRFs and SLDs) where the analysis is based on. Last but not least, some machining tests have been conducted aiming to compare the theoretical chatter occurrence conditions, provided by the SLD, with the experimental ones. For that, two Al5083 workpieces have been slot milled under different cutting conditions, facilitating the unexpected results wherein the conclusions have been based upon.

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Section: Machining T Machining Tests Estsmentioning

confidence: 99%

Analysis of the Tool Stick-Out Influence on Machining Chatter

Albizu¹,

Arrazola²,

Ørskov³

2021

Esaform 2021

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“…Significant reduction in the time of machining along with avoidance of chatter on the finished surface of the workpiece indicates that incorporation of the variable dynamics of the workpiece in the milling of thin-walled parts is essential. Powałka and Jemielniak [22] extracted SLDs, using operational modal analysis and solely based on the system response data measured by accelerometer during machining. Their results showed that the SLDs obtained from this method are not sensitive to the coefficients of cutting force model.…”

Section: -Introductionmentioning

confidence: 99%

Three dimensional prediction of stability lobes in end milling of thin-walled structures based on tool and workpiece dimensions

2021

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Nowadays, researchers are very interested to investigate the dynamic behavior of the thin-walled structures during the machining process due to their broad application in aerospace, automotive industries and etc. One of the main problems in machining of thin-walled structures is unstable chatter vibrations, which causes the poor machined surface quality and decreases the system life span. In this regard, the main aim of this paper is to propose a practical method to solve the chatter instability problem during the milling process of thin-walled components. To this end, first the effects of geometrical parameters like workpiece height, thickness, and tool overhang, diameter and their ratios on the chatter stability are investigated. Then three dimensional stability lobe diagrams (SLDs) base on the mentioned parameters are presented for the first time. In which one can implement the mentioned diagrams to switch the unstable machining process to stable one by changing the value of the system parameters. Finally, the results obtained by the experimental test show that the presented three dimensional diagrams can be utilized to avoid chatter instability in the milling process.

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“…Performing cutting with chatter is unacceptable due to the traces left on the workpiece surface (so-called chatter marks), the noise, the risk of damage to the tool, or even the machine tool subassemblies [1]. The problem of chatter vibrations is particularly troublesome while machining the workpieces with low stiffness [2,3]. An example of such machining can be the turning of slender shafts.…”

Section: Introductionmentioning

confidence: 99%

Implementation of an Algorithm to Prevent Chatter Vibration in a CNC System

Jasiewicz

Miądlicki

2019

Materials

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Machining of shafts characterized by a high compliance is difficult due to the occurrence of self-excited chatter vibrations. It is possible to limit their occurrence through the appropriate selection of technological parameters. For a proper selection of these parameters it is necessary to know the dynamic properties of the machine–tool–workpiece. This study proposes an approach through which these properties can be determined as a result of the synthesis of the dynamic properties of the system, using the receptance coupling method. Knowledge of these properties allows us to select the technological parameters of the lathe using the assistance system integrated into the CNC (Computerized Numerical Control). The final section of this work presents the experimental validation of the assistant and proposed procedures.

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Stability analysis in milling of flexible parts based on operational modal analysis

Cited by 27 publications

References 15 publications

Analysis of the Tool Stick-Out Influence on Machining Chatter

Analysis of the Tool Stick-Out Influence on Machining Chatter

Three dimensional prediction of stability lobes in end milling of thin-walled structures based on tool and workpiece dimensions

Implementation of an Algorithm to Prevent Chatter Vibration in a CNC System

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