Identification of Subsurface Deformation in Machining of Inconel 718

2011 ◽  
Vol 117-119 ◽  
pp. 1681-1688 ◽  
Author(s):  
Jin Ming Zhou ◽  
Volodymr Bushlya ◽  
Ru Lin Peng ◽  
Jan Eric Stahl
Keyword(s):  
Tool Wear ◽  
Inconel 718 ◽  
High Speed ◽  
Strain Analysis ◽  
Cutting Parameters ◽  
Correct Prediction ◽  
Process Conditions ◽  
Machined Surface ◽  
Subsurface Deformation ◽  
Subsurface Region

There is considerable industrial significance to understand the nature of subsurface deformation under the machined surface for correct prediction of surface properties in machined components based upon the machined conditions and material behaviors that give rise to them. In this study, high speed machining of Inconel 718 was carried with whisker reinforced ceramic cutting tool under different conditions of tool wear, coolant state and cutting parameters. The objective of the present investigation was to determine the effect of both cutting parameters and tool wear on the plastic deformation in the subsurface region of Inconel 718 after the finishing machining with above process conditions. The surface and subsurface region of machined specimens were examined using a high resolution scan electron microscope (HRSEM) and EBSD technique, microhardness measurements were also conducted on the test samples, accordingly plastic strain analysis were carried out.

Influence Characteristics of Tool Vibration and Wear on Machined Surface Topography in High-Speed Milling

2014 ◽  
Vol 800-801 ◽  
pp. 585-589
Author(s):  
Bin Jiang ◽  
Guang Lei Cao ◽  
Ming Hui Zhang ◽  
Shou Zheng Sun ◽  
Xuan Chi Liu
Keyword(s):  
Tool Wear ◽  
Surface Topography ◽  
High Speed ◽  
Three Dimensional ◽  
Cutting Parameters ◽  
Three Dimensional Model ◽  
Machined Surface ◽  
Tool Vibration ◽  
Key Factor ◽  
Vibration Measuring

Existing research on machined surface topography, only consider its response to vibration or wear certain factors, both vibration and wear impact on machined surface topography exist ambiguity and uncertainty, it cannot solve the design conflicts of machined surface topography. For this, this paper analyzes blade installation error, tool wear, vibration and deformation to reveal effects of tip space trajectory, build a three-dimensional model of machined surface topography in simulation, extract its characteristic parameters, by simulation of different amplitudes and wear, found that axis amplitude is a key factor affecting surface residual height, flank wear affects contour distribution distance significantly, by specimen milling experiments, use vibration measuring instrument and ultra-depth microscopy to obtain vibration, wear characteristics and machined surface topography parameters under different cutting parameters, then use the gray system theory to get correlation analysis of the test data, results showed that the influence of tool wear on machined surface topography is prominent than tool vibration.

Initial tool wear behavior in high-speed turning of Inconel 718

2020 ◽  
Vol 44 (3) ◽  
pp. 395-404
Author(s):  
Morvarid Memarianpour ◽  
Seyed Ali Niknam ◽  
Sylvain Turenne ◽  
Marek Balazinski
Keyword(s):  
Steady State ◽  
Tool Wear ◽  
Inconel 718 ◽  
High Speed ◽  
Wear Behavior ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Industrial Applications ◽  
Wide Range ◽  
Tool Wear Mechanism

Three distinctive regions of tool wear, known as initial wear, steady-state wear, and accelerated wear, are well understood. However, the effects of cutting parameters on the initial tool wear mechanism, morphology, and size have received less attention as compared to the other two regions. Knowing that adequate control of initial tool wear may lead to extended tool life, in particular in hard-to-cut metals such as superalloys, this topic has become a source of attention. Amongst superalloys, Inconel 718 is considered as one of the most difficult to cut materials, which has a wide range of industrial applications. This study intends to evaluate the effects of cutting parameters on initial tool wear, as well as tool wear progression, when turning Inconel 718. Therefore, microstructural evaluation of the initial tool wear mode under various cutting conditions, as well as tool wear measurements, were conducted. It was observed that certain elements of the workpieces were migrated to the insert flank face. This is evidence of adhesion at the initial moments of the cutting process. In contrast to many other easy-to-cut materials, the steady-state wear period when turning Inconel 718 is significantly short under a higher level of cutting speed and feed rate.

Evaluation of Surface Roughness and Tool Wear in High Speed Machining of Inconel 718

2019 ◽  
Vol 943 ◽  
pp. 66-71
Author(s):  
Moola Mohan Reddy ◽  
Viviana Yong Chai Nie
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Feed Rate ◽  
Inconel 718 ◽  
High Speed ◽  
Cutting Parameters ◽  
Spindle Speed ◽  
Depth Of Cut ◽  
High Speed Machining ◽  
Super Alloy

This research work considered the high speed milling operation of Inconel 718 using a 4 flute solid carbide end mill tool without the use of coolant. Inconel 718 is a Nickel based Heat Resistance Super Alloy (HRSA) that is vastly used in the aerospace industries due to its excellent corrosion resistance and good mechanical properties. However, Inconel 718 is considered as a difficult-to-cut super alloy, which poses several problems when machining the material. The aim of this work is to investigate the effect and the influence of cutting parameters (feed rate, spindle speed, and depth of cut) on the quality of the machined surface as well as to evaluate the tool wear after machining. This evaluation of the surface roughness was done using a CNC milling machine at various parameters range for the values of feed rate (50-150 mm/min), spindle speed (2000-4000 RPM), and depth of cut (0.05-0.1 mm). The experiment was designed using Response Surface Analysis Method with Central Composite Design (CCD) to optimize the experimentation. The resulting tool wear and surface roughness after high speed machining were then analysed using ANOVA to determine the cutting parameters which is most affecting the surface roughness.

COMPARISON OF PREPARATION METHODS IN TERMS OF TOOL LIFE AND SURFACE ROUGHNESS

2021 ◽  
Vol 2021 (4) ◽  
pp. 4836-4840
Author(s):  
ROBERT STRAKA ◽  
◽  
JOZEF PETERKA ◽  
TOMAS VOPAT ◽  
◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Cutting Parameters ◽  
Turning Process ◽  
Machined Surface ◽  
Preparation Methods ◽  
Machined Surface Roughness ◽  
Cutting Inserts ◽  
Drag Finishing ◽  
Edge Preparation

The article compares two cutting edge preparation methods and their influence on the machined surface roughness of the difficult to cut nickel alloy Inconel 718 and the tool wear of cutting inserts made of cemented carbide. The manufacturing and preparation process of cutting inserts used in the experiment were made by Dormer Pramet. The preparation methods used in the experiment were drag finishing and brushing. Cutting parameters did not change during the whole turning process to maintain the same conditions in each step of the process and were determined based on tests for a semi-finishing operation of the turning process. To obtain durability of 25 to 30 minutes with controlled development of the tool wear the cutting parameters were determined with cooperation with the cutting inserts manufacturer.

Experimental studies on graphite powder-mixed electro-discharge machining of Inconel 718 super alloys: Comparison with conventional electro-discharge machining

2018 ◽  
Vol 233 (2) ◽  
pp. 384-402 ◽  
Author(s):  
Santosh Kumar Sahu ◽  
Saurav Datta
Keyword(s):  
Thermal Conductivity ◽  
Residual Stress ◽  
Wear Rate ◽  
Tool Wear ◽  
Inconel 718 ◽  
Material Removal ◽  
Graphite Powder ◽  
Tool Wear Rate ◽  
Machined Surface ◽  
Electro Discharge Machining

Inconel 718 is a nickel-based super alloy widely applied in aerospace, automotive, and defense industries. Low thermal conductivity, extreme high temperature strength, strong work-hardening tendency make the alloy difficult-to-cut. In contrast to traditional machining, nonconventional route like electro-discharge machining is relatively more advantageous to machine this alloy. However, low thermal conductivity of Inconel 718 restricts electro-discharge machining from performing well. In order to improve the electro-discharge machining performance of Inconel 718, powder-mixed electro-discharge machining was reported in this paper. It was carried out by adding graphite powder to the dielectric media in consideration with varied peak discharge current. The morphology and topographical features of the machined surface including surface roughness, crack density, white layer thickness, metallurgical aspects (phase transformation, crystallite size, microstrain, and dislocation density), material migration, residual stress, microindentation hardness, etc. were studied and compared with that of the conventional electro-discharge machining. Additionally, effects of peak discharge current were discussed on influencing different performance measures of powder-mixed electro-discharge machining. Material removal efficiency and tool wear rate were also examined. Use of graphite powder-mixed electro-discharge machining was found to be better in performance for improved material removal rate, superior surface finish, reduced tool wear rate, and reduced intensity as well as severity of surface cracking. Lesser extent of carbon migration onto the machined surface as observed in powder-mixed electro-discharge machining in turn reduced the formation of hard carbide layers. As compared to the conventional electro-discharge machining, graphite powder-mixed electro-discharge machining exhibited relatively less microhardness and residual stress at the machined surface.

scholarly journals Conduction-Based Thermally Assisted Micromilling Process for Cutting Difficult-to-Machine Materials

2020 ◽  
Vol 4 (2) ◽  
pp. 34 ◽  
Author(s):  
Timo Platt ◽  
Alexander Meijer ◽  
Dirk Biermann
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
End Milling ◽  
High Speed Steel ◽  
High Strength ◽  
Process Conditions ◽  
Manufacturing Processes ◽  
Central Process ◽  
Workpiece Temperature ◽  
Micro End Milling

The increasing demand for complex and wear-resistant forming tools made of difficult-to-machine materials requires efficient manufacturing processes. In terms of high-strength materials; highly suitable processes such as micromilling are limited in their potential due to the increased tool loads and the resulting tool wear. This promotes hybrid manufacturing processes that offer approaches to increase the performance. In this paper; conduction-based thermally assisted micromilling using a prototype device to homogeneously heat the entire workpiece is investigated. By varying the workpiece temperature by 20 °C < TW < 500 °C; a highly durable high-speed steel (HSS) AISI M3:2 (63 HRC) and a hot-work steel (HWS) AISI H11 (53 HRC) were machined using PVD-TiAlN coated micro-end milling tools (d = 1 mm). The influence of the workpiece temperature on central process conditions; such as tool wear and achievable surface quality; are determined. As expected; the temporary thermal softening of the materials leads to a reduction in the cutting forces and; thus; in the resulting tool wear for specific configurations of the thermal assistance. While only minor effects are detected regarding the surface topography; a significant reduction in the burr height is achieved.

scholarly journals Prediction of Tool Lifetime and Surface Roughness for Nickel-Based Waspaloy

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Shao-Hsien Chen ◽  
Chung-An Yu
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
High Speed ◽  
Cutting Speed ◽  
High Strength ◽  
Cutting Parameters ◽  
Experimental Results ◽  
Predictive Values ◽  
Actual Surface ◽  
Wide Range

In recent years, most of nickel-based materials have been used in aircraft engines. Nickel-based materials applied in the aerospace industry are used in a wide range of applications because of their strength and rigidity at high temperature. However, the high temperatures and high strength caused by the nickel-based materials during cutting also reduce the tool lifetime. This research aims to investigate the tool wear and the surface roughness of Waspaloy during cutting with various cutting speeds, feed per tooth, cutting depth, and other cutting parameters. Then, it derives the formula for the tool lifetime based on the experimental results and explores the impacts of these cutting parameters on the cutting of Waspaloy. Since the impacts of cutting speed on the cutting of Waspaloy are most significant in accordance with the experimental results, the high-speed cutting is not recommended. In addition, the actual surface roughness of Waspaloy is worse than the theoretical surface roughness in case of more tool wear. Finally, a set of mathematical models can be established based on these results, in order to predict the surface roughness of Waspaloy cut with a worn tool. The errors between the predictive values and the actual values are 5.122%∼8.646%. If the surface roughness is within the tolerance, the model can be used to predict the residual tool lifetime before the tool is damaged completely. The errors between the predictive values and the actual values are 8.014%∼20.479%.

Turning of Inconel 718 by Cemented Carbides

2011 ◽  
Vol 496 ◽  
pp. 138-143 ◽  
Author(s):  
Ivan Mrkvica ◽  
Ryszard Konderla ◽  
Miroslav Faktor
Keyword(s):  
Tool Wear ◽  
Inconel 718 ◽  
Cutting Parameters ◽  
Nickel Superalloy ◽  
Cutting Conditions ◽  
Cutting Process ◽  
Cemented Carbides ◽  
Dry Turning ◽  
Cutting Inserts

This article deals with dry turning of nickel superalloy - Inconel 718. The different cemented carbides were applied for cutting process. These inserts were produced by Pramet Tools Ltd. company. This paper discusses durability of cutting inserts, the different intensity of tool wear at various cutting parameters. The most suitable cutting conditions are chosen in the scope of applied tools.

KT5331AS0 and 45 Steel Milling Comparison of Surface Characteristics

2011 ◽  
Vol 66-68 ◽  
pp. 2062-2068
Author(s):  
Jian Sheng Ding ◽  
Yang Ping Xu
Keyword(s):  
Mass Fraction ◽  
High Speed ◽  
Steel Surface ◽  
Surface Composition ◽  
Surface Hardness ◽  
Surface Oxidation ◽  
Surface Characteristics ◽  
Cutting Parameters ◽  
Machined Surface ◽  
Cooling Conditions

To study the surface composition, hardness, microstructure of the machined surface in KT5331AS0 and 45 steel at different cutting parameters and cooling conditions. The results show that: in the cutting process the mass fraction of W in KT5331AS0 steel surface were reduced to varying degrees, the basic chemical composition of 45 steel surface did not change; When KT5331AS0 steel in the high-speed, higher feed rate, it will be cause surface hardness increasing, however the hardness of 45 steel have no regular variation; 45 steel will have greater depth of the torn surface after milling, tearing a wider range, more obvious surface oxidation.

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