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Abstract: This paper iticludes the findings of an experitnental study on instabilities of the chip formation process during end milling ofTi6Al4V alloy and the infiuence of these instabilities on chatter formation. It has been identified that the chip formation process has a discrete nature, associated with the periodic shearing process during machining. The chip formed during machining of titanium alloy TÍ6A14V is found to be mainly with primary serrated teeth appearing in the main body of the chip. Secondary .serrated… Show more

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Cited by 16 publications
(9 citation statements)
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References 9 publications
(5 reference statements)
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“…High frequency signal analysis showed that the amplitudes of the serration signal varied widely, i.e., from 5 N to several hundred newtons. These large amplitudes may be the result of resonance phenomena [19]. Anayet Ullah Patwari et al observed that with the increase of the cutting speed, the natural frequency of the spindle is excited, and the amplitude is going to increase up to the resonance cutting speed before decreasing again.…”
Section: High Frequency Analysismentioning
confidence: 99%
See 1 more Smart Citation
“…High frequency signal analysis showed that the amplitudes of the serration signal varied widely, i.e., from 5 N to several hundred newtons. These large amplitudes may be the result of resonance phenomena [19]. Anayet Ullah Patwari et al observed that with the increase of the cutting speed, the natural frequency of the spindle is excited, and the amplitude is going to increase up to the resonance cutting speed before decreasing again.…”
Section: High Frequency Analysismentioning
confidence: 99%
“…Papers usually present the contribution of the workmaterial composition and mechanical properties on machining. Other studies focus on vibrations: the usually undesirable vibrations largely influence chip formation and surface integrity, which has led to three main types of studies, i.e., on the role of the workpiece and cutting conditions in the occurrence of such phenomena (ex: flexible workpiece used by Urbikain et al [18]), on the influence of chip serration on the occurrence of chatter vibrations [19] and finally, studies that used this vibration to improve chip serration and breakability by inducing forced and controlled vibrations on the cutting tool [20] (vibration-assisted machining).…”
Section: Introductionmentioning
confidence: 99%
“…9,10 However, titanium alloys are difficult to be machined because of its material characteristics such as high chemical activation, low elastic modulus, and poor thermal conductivity. Patwari et al 11 studied the influence of chip serration frequency on chatter formation during end milling of Ti-6Al-4V; it included the findings of an experimental study on instabilities of the chip formation process and the influence of these instabilities on chatter formation during end milling of Ti-6Al-4V alloy. Huang et al 12 proposed a milling force vibration analysis in high-speed-milling titanium alloy.…”
Section: Introductionmentioning
confidence: 99%
“…By interpolation of the previous two chip classifications, four major chip types are obtained: stable (complete), unstable, critical and severe chips. More recent Patwari et al [17] developed a mathematical model to predict the instability process of the chip formation by using the concept of chip serration frequencies.…”
Section: Introductionmentioning
confidence: 99%