A comparative study of characterization of machined surfaces of some commercial polymeric materials under varying machining parameters

Kaiser, M. S.; Fazlullah, Fahim; Ahmed, Shafaat

doi:10.21595/jmeacs.2020.21643

Cited by 7 publications

(12 citation statements)

References 24 publications

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“…When 0.2Si and 17.9Si added alloys are machined at 0.5 mm depth of cut and 3.6m/min cutting speed, relatively curly chips are observed in the case of 17.9Si added alloy (10. a1 and b1). This is because of lower elongation of the materials as Si decreases the ductility of the materials [7,20]. When the 4.0 mm depth of cut is used, a similar nature is observed for both materials but the thickness is higher (10. a2 and b2).…”

Section: Photographs Of the Chipsmentioning

confidence: 90%

Role of Si on machined surfaces of Al- based automotive alloys under varying machining parameters

Razin

Ahammed

Nur

et al. 2022

Journal of Mechanical and Energy Engineering

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Al-based automotive alloys with different level of Si content has been conducted on the characterization of machined surfaces in terms of roughness, temperature, chips formation as well as microstructue evaluation under different machining conditions. For this experiment a shaper machine with HSS single point V-shaped cutting tool is used at different cutting speed and depth of cut. The experimental results show that the surface roughness of the alloys decresess with cutting speed and depth of cut but it is more prominent on cutting speed. It is because of high cutting speed is more associated with the higher cutting temperatur and softening the work material leading to better surface finish. Higher Si added alloys shows the better surface finish due to formation of different intermettalics as more brittle. For brittle and higher hardness it produces the higher temperature during machining. During machining relatively curly and short chips are form by the high Si added alloy becase of its low elongation properties. Fracture surfaces of higher Si added alloy display more crack propagation obtained by the plate-like Si rich intermetallics.

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Section: Photographs Of the Chipsmentioning

confidence: 90%

Role of Si on machined surfaces of Al- based automotive alloys under varying machining parameters

Razin

Ahammed

Nur

et al. 2022

Journal of Mechanical and Energy Engineering

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“…It is occurred due to lower elongation of the materials. It is well known that addition of Si into this type of alloys increases the tensile strength with the expenses of elongation [21,22]. When the 0.2Si and 17.9Si alloys are gone through the down milling process the chips are relatively extended in size with the curly nature for 17.9Si alloy (Figure 6c and 6d).…”

Section: Chip Formationmentioning

confidence: 97%

Characterization of Machined Surfaces of Al-based Automotive Alloys with Different Levels of Si Content under Up Milling and Down Milling Operation

Ahammed¹,

Razin²,

Al-Nur³

et al. 2022

AMS

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This paper aims to investigate and compare the characteristics of machined surfaces and chips formation of aluminium-based automotive alloys with varying silicon content. The milling operations are performed using horizontal milling machine under two peripheral up milling and down milling methods with an HSS slab milling cutter. The experiment has conducted for different cutting speeds in dry condition while the depth of cut and machining feed are kept constant throughout the evaluation. The study reveals that the down-milled surface has higher hardness and better surface finish resulting in lower roughness as the cutting force is compressive in nature. On the contrary, the up-milled surface has lower hardness and micro cracks on it, which resulted in relatively higher surface roughness as the cutting force is tensile shear in nature. In addition, the surface hardness increases with the increment of silicon content in the alloys for both milling methods for the presence of hard Si rich intermetallics. The chips produced during up milling are shorter whereas the chips produced during down milling are longer for creation of higher temperature and pressure. Higher Si added alloy shows the curly like chips for its lower elongation behaviour. Fracture behaviour of higher Si alloy also confirms crack propagation obtained by the massive cleavage of the brittle and plate-types Si rich intermetallics.

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“…The breakage of the chip at the highest depth of cut can be ascribed to the synergistic presence of low temperatures and high stresses due to the highest material removal rate. Discontinuous chips can indeed be produced when high compressive stresses are involved or when a brittle material is machined [15].…”

Section: Fig 6 Morphology Of the Chips Obtained Under Dry And Cryogen...mentioning

confidence: 99%

Investigation of surface finish and chip morphology in cryogenic machining biomedical grade polyetheretherketone

SAJJA

2023

Materials Research Proceedings

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Abstract. Polyetheretherketone (PEEK) is attracting the attention of the biomedical field, thanks to its high biocompatibility and wear resistance. Nevertheless, the attainment of good quality surfaces when machining PEEK is still challenging. In this framework, the aim of the paper is to investigate the viability of using cryogenic machining to enhance the surface finish of PEEK compared to the outcomes of dry cutting. To do that, turning trails were executed at varying cooling strategy and depth of cut, and the resultant surface finish and chip morphology were evaluated. The obtained results indicated that cryogenic machining carried out at the highest depth of cut greatly enhanced the PEEK machinability.

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A comparative study of characterization of machined surfaces of some commercial polymeric materials under varying machining parameters

Cited by 7 publications

References 24 publications

Role of Si on machined surfaces of Al- based automotive alloys under varying machining parameters

Role of Si on machined surfaces of Al- based automotive alloys under varying machining parameters

Characterization of Machined Surfaces of Al-based Automotive Alloys with Different Levels of Si Content under Up Milling and Down Milling Operation

Investigation of surface finish and chip morphology in cryogenic machining biomedical grade polyetheretherketone

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