Analysis of Tool Wear: Part II: Applications of Flank Wear Models

1970 ◽  
Vol 92 (1) ◽  
pp. 109-114 ◽  
Author(s):  
A. Bhattacharyya ◽  
A. Ghosh ◽  
Inyong Ham
Keyword(s):  
Tool Wear ◽  
Critical Points ◽  
Quantitative Assessment ◽  
Inflection Point ◽  
Flank Wear ◽  
Cemented Carbides ◽  
Temperature Sensitive ◽  
Tool Failure ◽  
Cutting Speeds ◽  
Asme Paper

For machining with cemented carbides and ceramics, a quantitative assessment of tool failure at the flank for establishing “limit criterion” is necessary. The arbitrarily chosen flank wear limit for all cutting speeds is not valid at higher cutting speeds because of the earlier appearance of the “inflection point” which is often taken as criterion of flank-failure. In this paper, proceeding from the basic physical model of flank wear described in Part I of the paper (ASME Paper No. 68—WA/Prod-5), tool-life relations in the form of Taylor’s equations have been theoretically developed, the parameters of which have been compared with, experimental results. Further, the critical points of inflexion where the flank-wear characteristic enters temperature sensitive region resulting in accelerated wear have been uniquely defined. The location of these critical points have also been verified experimentally.

Effect of tool wear on chip formation during dry machining of Ti-6Al-4V alloy, part 2: Effect of tool failure modes

2015 ◽  
Vol 231 (9) ◽  
pp. 1575-1586 ◽  
Author(s):  
Shoujin Sun ◽  
Milan Brandt ◽  
Matthew S Dargusch
Keyword(s):  
Plastic Deformation ◽  
Tool Wear ◽  
Failure Modes ◽  
Flank Wear ◽  
Cutting Tools ◽  
Cutting Edge ◽  
Machined Surface ◽  
Tool Failure ◽  
Geometric Ratio ◽  
Cutting Speeds

Variation in the geometric and surface features of segmented chips with an increase in the volume of material removed and tool wear has been investigated at cutting speeds of 150 and 220 m/min at which the cutting tools fail due to gradual flank wear and plastic deformation of the cutting edge, respectively. Among the investigated geometric variables of the segmented chips, slipping angle, undeformed surface length, segment spacing, degree of segmentation and chip width showed the different variation trends with an increase in the volume of material removed or flank wear width, and achieved different values when tool failed at different cutting speeds. However, the chip geometric ratio showed a similar variation trend with an increase in the volume of material removed and flank wear width, and achieved the similar value at the end of tool lives at cutting speeds of both 150 and 220 m/min regardless of the different tool failure modes. Plastic deformation of the tool cutting edge results in severe damage on the machined surface of the chip and significant compression deformation on the undeformed surface of the chip.

scholarly journals Impact of Cutting Speed on Tool Life of Coated and Uncoated Cemented Carbide during Turning of S31700 Grade Stainless Steel

2020 ◽  
Vol 9 (5) ◽  
pp. 2022-2025
Keyword(s):  
Stainless Steel ◽  
Tool Wear ◽  
Stainless Steels ◽  
Entire Range ◽  
Flank Wear ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Cemented Carbides ◽  
Depth Of Cut ◽  
Cutting Speeds

Here, we found and observed different results of experimental work in dry turning of S31700 grade stainless steels using coated and uncoated cemented carbides. The turning tests were conducted at three different cutting speeds (150and 200m/min) while feed rate and depth of cut were kept constant at 0.3 mm/rev and 1 mm, respectively. The cutting tools used were ISO P30 uncoated and TiN-TiCN-Al2O3 -ZrCN coated cemented carbides. We found the influences of cutting speed on the average flank wear. The worn parts of the cutting tools were also examined using optical microscopy and SEM. Here we concluded that cutting speed significantly affected the average flank wear. The multilayer effects superior resistance to tool wear compared to its uncoated counterpart in the entire range of cutting speeds during turning of S31700 stainless (AISI317) steel.

Cutting Tool Wear and Mechanisms of Chip Formation During High-Speed Machining of Compacted Graphite Iron

2007 ◽  
Author(s):  
Niniza S. P. Dlamini ◽  
Iakovos Sigalas ◽  
Andreas Koursaris
Keyword(s):  
Tool Wear ◽  
Surface Finish ◽  
Failure Criterion ◽  
Cutting Tool ◽  
Flank Wear ◽  
Cutting Tools ◽  
Compacted Graphite Iron ◽  
Crater Wear ◽  
Compacted Graphite ◽  
Cutting Speeds

Cutting tool wear of polycrystalline cubic boron nitride (PcBN) tools was investigated in oblique turning experiments when machining compacted graphite iron at high cutting speeds, with the intention of elucidating the failure mechanisms of the cutting tools and presenting an analysis of the chip formation process. Dry finish turning experiments were conducted in a CNC lathe at cutting speeds in the range of 500–800m/min, at a feed rate of 0.05mm/rev and depth of cut of 0.2mm. Two different tool end-of-life criteria were used: a maximum flank wear scar size of 0.3mm (flank wear failure criterion) or loss of cutting edge due to rapid crater wear to a point where the cutting tool cannot machine with an acceptable surface finish (surface finish criterion). At high cutting speeds, the cutting tools failed prior to reaching the flank wear failure criterion due to rapid crater wear on the rake face of the cutting tools. Chip analysis, using SEM, revealed shear localized chips, with adiabatic shear bands produced in the primary and secondary shear zones.

The Genesis of Tool Wear in Machining

2015 ◽  
Author(s):  
Trung Nguyen ◽  
Kyung-Hee Park ◽  
Xin Wang ◽  
Jorge Olortegui-Yume ◽  
Tim Wong ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Tool Wear ◽  
Titanium Alloys ◽  
Flank Wear ◽  
Lamellar Microstructure ◽  
Dissolution Mechanism ◽  
Low Alloy Steels ◽  
Crater Wear ◽  
Alloy Steels ◽  
Cutting Speeds

This paper presents a series of experimental and theoretical efforts that we have made in unraveling the tool wear mechanisms under steady state conditions in machining for the last few decades. Two primary modes of steady state tool wear considered in this paper are flank and crater wear. We preface this paper by stating that flank wear is explained as abrasive wear due to the hard phases in a work material while crater wear is a combination of abrasive wear and generalized dissolution wear which encompasses both dissolution wear as well as diffusion wear. However, the flank wear was not a function of the abrasive cementite content when turning low alloy steels with pearlitic microstructures. The machined surfaces of these alloys are examined to confirm the phase transformation (ferrite to austenite), which diminishes the effect of cementite content. In particular, the cementite phase present in low alloy steels dissociates and diffuses into the transformed austenitic phase during machining. Dissolution wear is claimed to describe the behavior of crater wear at high cutting speeds. The original dissolution mechanism explains the crater wear in the machining of ferrous materials and nickel alloys at high cutting speeds, but the generalization of the dissolution wear is necessary for titanium alloys. In machining titanium alloys, the original dissolution mechanism did not show a good correlation with experimental results; generally the diffusivity of the slowest diffusing tool constituent in titanium limits the wear rate. The phase transformation from alpha (HCP) to beta (BCC) phases can also take place in machining titanium alloys, which drastically increases the crater wear due to the few orders of magnitude increase in diffusivity. The most puzzling issue is however the presence of the scoring marks even though no hard inclusion is typically present in titanium alloys. This is finally explained by the heterogeneity in the microstructure due to the anisotropic hardness of alpha (HCP) phase (the hardness in c-direction is 50% higher than the hardness in other directions) and the presence of lamellar microstructure (alternating layers of alpha and beta). The lamellar microstructure has not only the in-plane anisotropic hardness but also a greater hardness than other phases. Even though we cannot claim to fully understand the physics behind tool wear, our combined approaches have unveiled some elementary wear mechanisms.

scholarly journals Metallurgical and Machinability Characteristics of Wrought and Selective Laser Melted Ti-6Al-4V

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Manikandakumar Shunmugavel ◽  
Ashwin Polishetty ◽  
Junior Nomani ◽  
Moshe Goldberg ◽  
Guy Littlefair
Keyword(s):  
Tool Wear ◽  
Cutting Tool ◽  
Flank Wear ◽  
Research Work ◽  
Cutting Speed ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Coating Delamination ◽  
All Speeds ◽  
Cutting Speeds

This research work presents a machinability study between wrought grade titanium and selective laser melted (SLM) titanium Ti-6Al-4V in a face turning operation, machined at cutting speeds between 60 and 180 m/min. Machinability characteristics such as tool wear, cutting forces, and machined surface quality were investigated. Coating delamination, adhesion, abrasion, attrition, and chipping wear mechanisms were dominant during machining of SLM Ti-6Al-4V. Maximum flank wear was found higher in machining SLM Ti-6Al-4V compared to wrought Ti-6Al-4V at all speeds. It was also found that high machining speeds lead to catastrophic failure of the cutting tool during machining of SLM Ti-6Al-4V. Cutting force was higher in machining SLM Ti-6Al-4V as compared to wrought Ti-6Al-4V for all cutting speeds due to its higher strength and hardness. Surface finish improved with the cutting speed despite the high tool wear observed at high machining speeds. Overall, machinability of SLM Ti-6Al-4V was found poor as compared to the wrought alloy.

On the Wear Mechanisms and Cutting Performance of Silicon Carbide Whisker-Reinforced Alumina

1992 ◽  
Vol 114 (3) ◽  
pp. 301-308 ◽  
Author(s):  
A. R. Thangaraj ◽  
K. J. Weinmann
Keyword(s):  
Silicon Carbide ◽  
Wear Mechanisms ◽  
Flank Wear ◽  
Dimensional Accuracy ◽  
Depth Of Cut ◽  
Tool Failure ◽  
Silicon Carbide Whisker ◽  
Nickel Based Superalloy ◽  
Notch Wear ◽  
Cutting Speeds

The objective of this research was to study the types of wear suffered by silicon carbide whisker-reinforced aluminum oxide inserts in the machining of Inconel 718. Further, it was desired to study the effects of tool wear and cutting conditions on cutting forces, workpiece dimensional accuracy, and surface finish. Machining tests were conducted using 12.7 mm diameter round inserts at cutting speeds ranging from 6.0 to 13.0 m/s. The feed rates ranged from 0.13 to 0.51 mm/rev and two depths of cut of 0.76 and 1.27 mm were used. Tool failure in the cutting of the relatively soft (220 HB) nickel-based superalloy was due to excessive wear. Flank wear played a larger role at the lower speeds, but depth-of-cut notch wear was significant at the higher speeds. Abrasion, adhesion, and chipping were found to be the dominant wear mechanisms. The results of this study are presented and discussed in this paper.

Tool Performance in High Speed Finish Milling of Ti6Al4V

Manufacturing ◽  
2002 ◽  
Author(s):  
D. Barnett-Ritcey ◽  
M. A. Elbestawi
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
Flank Wear ◽  
Tool Failure ◽  
Tool Materials ◽  
Fine Grained ◽  
Life Tool ◽  
Tool Performance ◽  
High Feed ◽  
Coated Carbide

High feed rates may be achieved when finish milling titanium (Ti6AI4V) alloy (300HB) at speeds of 152–305 m/min (500–1000sfm). Three tool materials (micro-grain C2 carbide, fine-grained C2 carbide, and a TiAIN coated carbide) were tested using liquid (flood and through-spindle coolant (TSC) at pressures of 2.07 MPa), pressurized air (69–689 kPa (10–100psi)), and dry (no coolant) coolant conditions to prolong tool life. Tool wear manifested itself in two distinct patterns, gradual flank wear or micro-chipping leading to gross fracture. Which of these will lead to tool failure, will depend largely on the ability of the coolant to cool the tool (retard flank wear) without inducing thermal shock. Typically, under pressurized air, speeds up to 267 m/min (875sfm) and chip loads of 0.057–0.114 mm (0.00225–0.0045") may be attained.

Prediction of Tool Wear Based on Cutting Forces When End Milling Titanium Alloy Ti-6Al-4V

2014 ◽  
Author(s):  
Cynthia Stanley ◽  
Durul Ulutan ◽  
Laine Mears
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Flank Wear ◽  
End Milling ◽  
Cutting Parameters ◽  
Resultant Force ◽  
Process Time ◽  
Force Output ◽  
Tool Failure ◽  
Tool Flank Wear

Research regarding tool wear in the machining of difficult materials is important because it is a significant indicator of process failure in terms of degradation of part quality, and the resulting high cost and increased process time. Prior researchers have investigated the effects of cutting parameters on tool wear and as a result, tool life has seen significant improvement. However, these studies are not concerned with tool flank wear during machining; they instead focus on tool flank wear after a certain amount of cutting distance. This study proposes a new method of predicting tool flank wear during machining that has the capability of suggesting tool failure without directly measuring the tool. For this purpose, a detailed set of experiments on end milling of titanium alloy Ti-6Al-4V was conducted and analyzed. Then, the resultant force output, which can be monitored during machining, was used to establish a predictive algorithm for tool flank wear. Using the increase in the resultant force as well as the total energy spent on the workpiece, it was shown that tool flank wear can be effectively predicted during machining and this can decrease the time spent on tool failure inspection and early tool change, increasing the throughput of the process.

Tool Wear in Milling Hardened Die Steel

1998 ◽  
Vol 120 (4) ◽  
pp. 669-673 ◽  
Author(s):  
S. Nelson ◽  
J. K. Schueller ◽  
J. Tlusty
Keyword(s):  
Tool Wear ◽  
Tool Life ◽  
Flank Wear ◽  
Chip Thickness ◽  
Hardened Steel ◽  
Depth Of Cut ◽  
Limiting Factor ◽  
End Mill ◽  
Carbide Inserts ◽  
Cutting Speeds

Tool wear is an important limiting factor in machining hardened steel. Plane milling of H13 hot work tool steel (42–46 HRC) was conducted on a three-axis machine to obtain flank wear data with the objective of finding operating parameters providing extended tool life. Microgram carbide and PCBN tipped carbide round inserts in an off-center ball nose end mill with a single cutting edge were considered. Tool life was longer for the micrograin carbide inserts when cutting speeds were near 150 m/min. The PCBN grades performed best at the highest speed tested. A limited radial and axial depth of cut with a larger maximum chip thickness provided the best tool life over the parameters tested.

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