Friction Coefficients on Surface Finish of AlTiN Coated Tools in the Milling of Ti6Al4V

Lui

et al. 2021

JMMP

The present study proposes an integrated prediction model for both shearing and ploughing constants for the peripheral milling of Inconel 718 by using a preidentified mean normal friction coefficient. An equation is presented for the identification of normal mean friction angle of oblique cutting in milling. A simplified oblique cutting model is adopted for obtaining the shear strain and shearing constants for a tool of given helix angle, radial rake angle, and honed edge radius. The shearing and ploughing constants predicted from analytical model using the Merchant’s shear angle formula and the shear flow stress from the selected Johnson–Cook material law are shown to be consistent with the experimental results. The experimentally identified normal friction angles and shearing and edge ploughing constants for the Inconel 718 milling process are demonstrated to have approximately constant values irrespective of the average chip thickness. Moreover, the predicted forces obtained in milling aged Inconel 718 alloy are in good agreement with the experimental force measurements reported in the literature. Without considering the thermal–mechanical coupling effect in the material law, the presented model is demonstrated to work well for milling of both annealed and aged Inconel 718.

Section: Removal Of Bottom Tool Edge Ploughing Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Shearing and Ploughing Constants in Milling of Inconel 718

Lui

et al. 2021

JMMP

“…Mohammad Akmal et al [9] studied the effects of AlTiN coatings by slot milling Ti6Al4V and compared it with end mills made up of uncoated solid carbide. The paper has utilized magnetic, friction finishing technique to evaluate the cutting forces and frictional coefficient.…”

Section: Literature Reviewmentioning

confidence: 99%

Comparative analysis of process parameters in wear properties of coated and uncoated tool inserts during machining of Hastelloy C-276

Kiran¹,

Nagaraju²

2020

FME Transactions

Machining is the most significant process for any manufacturing company to improve the quality of the finished component. The objective of this article is to analyse the process performance of Hastelloy C-276 using PVD (Physical Vapour Deposition) coated, uncoated and alumina-based ceramic tool inserts of high grade quality. Turning process was performed on NC (Numerical Control) machine by varying RPM, feed rate and depth of cut based on the Taguchi L9 orthogonal array approach. In this study, crank wear, flank wear, nose wear, SR (Surface Roughness), MRR (Material Removal Rate), tool temperature and feed force are examined during machining of hardened material and simultaneously static structural analysis of the tool insert along with the tool holder was performed using ANSYS mechanical. This research investigation helps in determining appropriate parameters with varied coated inserts to make the process easier, efficient and economical.

“…Among the various factors that affect the friction coe cient at the cutting interface, the type of work and tool materials, tool geometry, tool wear, and lubricating conditions can be highlighted. These factors are responsible for changes in the machining forces and heat generated in the cutting zones, and as such, they continuously change the tribosystem's behavior [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Nanosheets on Thermo-Physical and Tribological Properties of Sustainable Cutting Fluids for MQL Application in Machining Processes

Baldin

Silva

Gelamo

et al. 2021

Preprint

This study investigates the effects of applying two vegetable and one mineral-based cutting fluids with 0.05 %wt and 0.1 %wt dispersion of graphene sheets on the tribosystem generated at the interface between the cemented carbide tool and the AISI 1045 steel workpiece. The fluids are firstly characterized (viscosity, thermal conductivity and diffusivity, and wettability) and tested in reciprocating and ramp milling tests. The results show that the graphene sheets alter the thermo-physical and tribological properties of the cutting fluids; in this case, vegetable-based cutting fluids, even in minimum quantities and with graphene nanoparticles, have a high potential for increasing the efficiency and sustainability of the milling process.