Effect of Temperature on Tool Wear During Milling of Ti64

2021 ◽  
Vol 143 (7) ◽  
Author(s):  
Q. Lagarde ◽  
V. Wagner ◽  
G. Dessein ◽  
M. Harzallah
Keyword(s):  
Tool Wear ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Effect Of Temperature ◽  
Fundamental Parameter ◽  
Ir Camera ◽  
Radial Depth ◽  
Higher Temperature ◽  
Two Parameters ◽  
Machining Productivity

Abstract In recent years, the development of new, increasingly resistant materials limit machining productivity. This observation is especially true for titanium alloys. The state-of-the-art shows that one of the phenomena responsible for tool wear is temperature. The high temperature is explained by the low thermal conductivity of the alloy and its high mechanical properties. Consequently, high temperatures generated when cutting speeds are increasing lead to very rapid wear phenomena. However in milling, the period during which the insert is not in contact with the material may allow it to cool but its effect is not clearly established. In order to correlate tool wear and cutting temperatures in milling, an experimental bench has been developed. In turning and therefore with a fixed tool, the milling conditions are recreated and allow to measure the temperatures on the cutting face. Two parameters were tested: (i) radial depth, which influences the tooth stress time, and (ii) the cutting speed, which is the fundamental parameter of the cutting temperature. Experimentally, it appears that increasing radial engagement and cutting speed reduces tool life and increases temperatures. However, the phenomenological analysis is not immediate. The relationship between these phenomena is based on a heat balance of the cutting process. The use of an infrared (IR) camera in this problem and a specific analysis method allow observing the temperature gradients on the cutting face making the analysis more robust compared to the thermocouple technic. It thus appears that the increase in radial engagement leads to a higher tool temperature, but the analyses show above all a higher temperature within the insert and therefore more difficult to evacuate.

Cutting Temperature and Cutting Forces Investigation Based on the Taguchi Design Method when High-Speed Milling of Titanium Matrix Composites with PCD Tool

2016 ◽  
Vol 836-837 ◽  
pp. 168-174 ◽  
Author(s):  
Ying Fei Ge ◽  
Hai Xiang Huan ◽  
Jiu Hua Xu
Keyword(s):  
Cutting Force ◽  
Feed Rate ◽  
Cutting Forces ◽  
High Speed ◽  
Volume Fraction ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
High Speed Milling ◽  
Radial Depth

High-speed milling tests were performed on vol. (5%-8%) TiCp/TC4 composite in the speed range of 50-250 m/min using PCD tools to nvestigate the cutting temperature and the cutting forces. The results showed that radial depth of cut and cutting speed were the two significant influences that affected the cutting forces based on the Taguchi prediction. Increasing radial depth of cut and feed rate will increase the cutting force while increasing cutting speed will decrease the cutting force. Cutting force increased less than 5% when the reinforcement volume fraction in the composites increased from 0% to 8%. Radial depth of cut was the only significant influence factor on the cutting temperature. Cutting temperature increased with the increasing radial depth of cut, feed rate or cutting speed. The cutting temperature for the titanium composites was 40-90 °C higher than that for the TC4 matrix. However, the cutting temperature decreased by 4% when the reinforcement's volume fraction increased from 5% to 8%.

Experimental Investigation of Mechanical-Thermal Characteristics in High Efficiency Turning Titanium Alloy Ti6Al4V

2016 ◽  
Vol 836-837 ◽  
pp. 20-28
Author(s):  
Li Min Shi ◽  
Cheng Yang ◽  
Qi Jun Li
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Cutting Force ◽  
High Efficiency ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Thermal Characteristics ◽  
Tool Failure ◽  
Minimal Quantity Lubrication ◽  
Titanium Alloy Ti6al4v

Titanium alloy Ti6Al4V has poor machinability, which leads to high unit cutting force and cutting temperature, rapid tool failure. In this study, the effect of the cutting speed, feed rate and cooling condition on cutting force and cutting temperature is critically analysed by turning experiment. At the same time, the relationship is established among tool wear, cutting force and cutting temperature. This investigation has shown that cutting speed is the decisive factor which increasing cutting force and cutting temperature. In the process of turning, tool wear results in high amounts of heat and mechanical stress, which leads to serious tool wear. The Minimal Quantity Lubrication reduces the frictional condition at the chip-tool, decreases cutting force and cutting temperature, and delays the tool failure.

Tool Wear Characteristics in High Speed Milling of Ti-6Al-4V Alloy with Nitrogen Gas Medium

2006 ◽  
Vol 315-316 ◽  
pp. 588-592 ◽  
Author(s):  
Wei Zhao ◽  
Ning He ◽  
Liang Li ◽  
Z.L. Man
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
High Speed Milling ◽  
Radial Depth ◽  
Oil Mist ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes

High speed milling experiments using nitrogen-oil-mist as cutting medium were undertaken to investigate the characteristics of tool wear for Ti-6Al-4V Alloy, a kind of important and commonly used titanium alloy in the aerospace and automobile industries. Uncoated carbide tools have been applied in the experiments. The cutting speed was 300 m/min. The axial depth of cut and the radial depth of cut were kept constant at 5.0 mm and 1.0 mm, respectively. The feed per tooth was 0.1 mm/z. Optical and scanning electron microscopes have been utilized to determine the wear mechanisms of the cutting tools, and energy spectrum analysis has been carried out to measure the elements distribution at the worn areas. Meanwhile, comparisons were made to discuss the influence of different cutting media such as nitrogen-oil-mist and air-oil–mist upon the tool wear. The results of this investigation indicate that the tool life in nitrogen-oil-mist is significantly longer than that in air-oil-mist, and nitrogen-oil-mist is more suitable for high speed milling of Ti-6Al-4V alloy than air-oil-mist.

Evaluation of Thermal Effects in Turning Processes: Numerical and Experimental Approach

2019 ◽  
Author(s):  
Aruna Prabha Kolluri ◽  
Srinivasa Prasad Balla ◽  
Satya Prasad Paruchuru
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Tool Wear ◽  
Wear Mechanism ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Tool Material ◽  
Maximum Error ◽  
Tool Wear Mechanism ◽  
Coated Carbide

Abstract The 3D Finite element method (FEM) is an efficient tool to predict the variables in the cutting process, which is otherwise challenging to obtain with the experimental methods alone. The present study combines both experimental findings and finite element simulation outcomes to investigate the effect of tool material on output process variables, such as vibrations, cutting temperature distribution and tool wear mechanism. Machining of popular aerospace materials like Ti-6Al-4V and Al7075 turned with coated and uncoated tools are part of the investigation. The authors choose the orthogonal test, measured vibrations and cutting temperatures and used FE simulations to carry out the subsequent validations. This study includes the influence of the predicted heat flux and temperature distribution on the tool wear mechanism. The main aim of this study is to investigate the performance quality of uncoated and coated carbide tools along with its thermal aspects. Comparison of experiment and simulation outcomes shows good agreement with a maximum error of 9.02%. It has been noted that the increase of cutting temperature is proportional to its cutting speed. As the cutting speed increases, it is observed that vibration parameter and flank wear value also increases. Overall, coated carbide turning insert tool is the best method for metal turning with higher rotational speeds of the spindle.

Experimental Study of Cutting Performance and Tool Wear in Dry Side Milling of Aluminum Alloy with DLC-Coated HSS-Co Cutter

2012 ◽  
Vol 523-524 ◽  
pp. 64-69
Author(s):  
Yoshio Mizugaki ◽  
Kazuki Takafuji ◽  
Koichi Kikkawa ◽  
Teppei Kuroda ◽  
Taro Kimura
Keyword(s):  
Aluminum Alloy ◽  
Tool Wear ◽  
Tool Life ◽  
Cutting Speed ◽  
Cutting Performance ◽  
Experimental Results ◽  
Steel Matrix ◽  
Milling Cutter ◽  
Side Milling ◽  
Radial Depth

This paper presents the experimental results of cutting performance and tool wear of a milling cutter in dry side milling of aluminum alloy A2017. The milling cutter consists of Co-bonded High-Speed-Steel matrix with Diamond-Like-Carbon coating (abbrev. DLC-coated HSS-Co cutter). The machining experiments were carried out under cutting speed of 63 to 189 [m•min-1] and feed of 0.08 [mm/tooth/rev], and the criterion of tool life was the generation of gauge and/or scratch on a machined surface. The experimental results support that the DLC-coated cutter in up cutting has good performance among four types of combination by the presence or absence of coating and the up/down cutting manner. They also showed that the tool life of DLC-coated cutter in up cutting under cutting speed of 157 [m•min-1] was corresponding to the cutting distance of 80 [m] with average width of flank wear 102 [μm] and that in down cutting was 60 [m] with 85 [μm]. In the range of cutting distance up to 100 [m], the resultant cutting force with the DLC-coated cutter was smaller than that with a non-coating cutter. In case of the DLC-coated cutter in up cutting under the cutting speed of 189 [m•min-1], a chatter vibration occurred during the initial cutting distance. In case of the radial depth of cut of 1.5 [mm], it lasted up to the cutting distance of 10 [m] and more.

Effect of tool wear on chip formation during dry machining of Ti-6Al-4V alloy, part 1: Effect of gradual tool wear evolution

2015 ◽  
Vol 231 (9) ◽  
pp. 1559-1574 ◽  
Author(s):  
Shoujin Sun ◽  
Milan Brandt ◽  
Matthew S Dargusch
Keyword(s):  
Plastic Deformation ◽  
Tool Wear ◽  
Chip Formation ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Machined Surface ◽  
Segmented Chip ◽  
Gradual Development ◽  
Geometric Variables ◽  
On Chip

Geometric features of the segmented chip have been investigated along with the volume of material removed at a cutting speed at which tool wear is characterized by the gradual development of flank wear when cutting Ti-6Al-4V alloy. The chip geometric variables varied with an increase in the volume of material removed as the combined effect of change in tool’s geometry and increase in cutting temperature. Plastic deformation dimples were observed as periodical regions on the machined surface, a row on each undeformed surface and region on the top of the slipping surface of the segmented chip when cutting with new tool; these dimples on the undeformed surface and machined surface are elongated in the direction of chip flow. All these dimples became less with an increase in the volume of material removed and almost disappeared when the chip was removed with the worn tool at the end of its life. A model of segmented chip formation process has been proposed to satisfactorily explain the formation of the plastic deformation dimples on the undeformed surface and machined surface of the segmented chip produced with a new cutting tool and the transition of chip geometry with the evolution of tool wear.

An Approach on Fuzzy and Regression Modeling for Hard Milling Process

2015 ◽  
Vol 813-814 ◽  
pp. 498-504 ◽  
Author(s):  
A. Tamilarasan ◽  
D. Rajamani ◽  
A. Renugambal
Keyword(s):  
Manufacturing Systems ◽  
Metal Removal ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Milling Process ◽  
Regression Modeling ◽  
Average Error ◽  
Depth Of Cut ◽  
Hard Milling ◽  
Radial Depth

This paper proposes the prediction of cutting temperature, tool wear and metal removal rate using fuzzy and regression modeling techniques for the hard milling process. The feed per tooth, radial depth of cut, axial depth of cut and cutting speed were used as process state variables.The experiements were conducted using RSM based central composite rotatable design methodology. Regression and fuzzy modeling were used to evaluate the input – output relationship in the process. It is interesting to observe that the R2 and average error values for each response are very consistent with small variations were obtained.Also, the confirmation results show that very less relative error varitions. Thus, the developed fuzzy models directly integrated in manufacturing systems to reduce the more computational complexity in the process planning activities.

Machinability of Pearlitic Cast Iron With Cubic Boron Nitride (CBN) Cutting Tools

2002 ◽  
Vol 124 (4) ◽  
pp. 820-832 ◽  
Author(s):  
Jiancheng Liu ◽  
Kazuo Yamazaki ◽  
Hiroyuki Ueda ◽  
Norihiko Narutaki ◽  
Yasuo Yamane
Keyword(s):  
Cast Iron ◽  
Boron Nitride ◽  
Tool Wear ◽  
High Speed ◽  
Cubic Boron Nitride ◽  
Cutting Tools ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Machining Conditions ◽  
Machining Center

In order to increase the accurate finishing productivity of pearlitic cast iron, face milling by CBN (Cubic Boron Nitride) cutting tools was studied. The main focus of the study is the machinability investigation of pearlitic cast iron with CBN cutting tools by studying the relationships among machining conditions such as feed rate, cutting speed as well as CBN cutting tool type, tool wear, workpiece surface quality, cutting forces, and cutting temperature. In addition, an emphasis is put on the effect of Al additive in pearlitic cast iron on its machinability and tool wear characteristics. High-speed milling experiments with CBN cutting tools were conducted on a vertical machining center under different machining conditions. The results obtained provide a useful understanding of milling performance by CBN cutting tools.

The Study of Tool Wear Performance on Pocket Milling Strategy

2014 ◽  
Vol 699 ◽  
pp. 64-69 ◽  
Author(s):  
A.B. Mohd Hadzley ◽  
A. Siti Sarah ◽  
R. Izamshah ◽  
M.R. Nurul Fatin
Keyword(s):  
Tool Wear ◽  
Tool Path ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Cnc Milling ◽  
Wear Performance ◽  
Pocket Milling ◽  
Cnc Milling Machine ◽  
Radial Depth ◽  
Wet Condition

The increasing productivity demand in machining industry has lead for fast material removal machining technique of pocket milling using different tool path strategies. This project aims to study about the effect of different tool path strategies on tool wear when machining aluminium alloy 7076. Five milling strategies were evaluated outward helical, inward helical, back and forth, offset on part one-way and offset on part zigzag. CATIA V5R19 was used to setup milling path and the machining experiments were carried out on a HAAS’ 3 axis CNC milling machine. The machining was held under wet condition with 2500 rpm cutting speed, 800 mm/min feed rate, 2 mm radial depth of cut and 2 mm axial depth of cut. The results showed that the best tool path strategies are inward helical and offset on part one-way, while the worst tool path strategy is outward helical. Failure to evacuate chip during pocket milling is the main reason to cause rapid tool wear due to temperature rise and higher contact time and area of cutting tool with the chip. Results from this experiment help to guide the machinist to perform pocket milling effectively.

scholarly journals The effect of MQL on tool wear progression in low-frequency vibration-assisted  drilling of CFRP/Ti6Al4V stack material

2021 ◽  
Author(s):  
Ramy Hussein ◽  
Ahmad Sadek ◽  
Mohamed Elbestawi ◽  
Helmi Attia
Keyword(s):  
Tool Wear ◽  
Vibration Amplitude ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Low Frequency ◽  
Drilling Process ◽  
Machining Parameters ◽  
Geometrical Accuracy ◽  
Low Frequency Vibration

Abstract In this paper, the tool wear mechanism in low-frequency vibration-assisted drilling (LF-VAD) of carbon fiber reinforced polymer (CFRP)/Ti6Al4V stacks has been proposed using variably machining parameters. Based on the kinematics analysis, the effect of vibration amplitude on the chip formation, uncut chip thickness, chip radian, and axial velocity was presented. Subsequently, the effect of LF-VAD on the cutting temperature, tool wear, delamination, and geometrical accuracy was presented for different vibration amplitude. The LF-VAD with the utilization of minimum quantity lubricant (MQL) resulted in a successful drilling process of 50 holes, with a 63 % reduction of the cutting temperature. For the rake face, LF-VAD reduced the adhered height of Ti6Al4V by 80 % at low cutting speed and reduced the crater depth by 33 % at the high cutting speed. On the other hand, LF-VAD reduced the flank wear land by 53 %. Furthermore, LF-VAD showed a significant enhancement on the CFRP delamination, geometrical accuracy, and burr formation.

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