Temperature Variation in the Cutting Tool in End Milling

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Masahiko Sato ◽  
Naoki Tamura ◽  
Hisataka Tanaka
Keyword(s):  
Optical Fiber ◽  
Temperature Variation ◽  
Optical Fibers ◽  
Cutting Tool ◽  
End Milling ◽  
Time Lag ◽  
Cutting Speed ◽  
Rake Face ◽  
Tool Insert ◽  
Tungsten Carbide Tool

This paper describes the cyclic temperature variation beneath the rake face of a cutting tool in end milling. A newly developed infrared radiation pyrometer equipped with two optical fibers is used to measure the temperature. A small hole is drilled in the tool insert from the underside to near the rake face, and an optical fiber is inserted in the hole. One of the optical fibers runs through the inside of the machine tool spindle and connects to the other optical fiber at the end of the spindle. Infrared rays radiating from the bottom of the hole in the tool insert during machining are accepted and transmitted to the pyrometer by the two optical fibers. For a theoretical analysis of the temperature in end milling, a cutting tool is modeled as a semi-infinite rectangular corner, and a Green’s function approach is used. Variation in tool-chip contact length in end milling is considered in the analysis. Experimentally, titanium alloy Ti–6Al–4V is machined in up and down milling with a tungsten carbide tool insert at a cutting speed of 214 m/min. In up milling, the temperature beneath the rake face increases gradually during the cutting period and reaches a maximum just after the cutting. In contrast, in down milling, the temperature increases immediately after cutting starts; it reaches a maximum and then begins to decrease during cutting. This suggests that the thermal impact to the cutting tool during heating is larger in down milling than in up milling, whereas that during cooling is larger in up milling than in down milling. Temperature variation is measured at different depths from the rake face. With increasing depth from the rake face, the temperature decreases and a time lag occurs in the temperature history. At 0.6 mm from the major cutting edge, the temperature gradient toward the inner direction of the tool insert is about 300°C/0.5 mm. The calculated and experimental results agree well.

Measurement of Rake Face Temperature in Cryogenic Machining of Titanium Alloy

2020 ◽  
Author(s):  
Masahiko Sato ◽  
Masashi Kamoto
Keyword(s):  
Carbon Dioxide ◽  
Titanium Alloy ◽  
Optical Fiber ◽  
Liquid Nitrogen ◽  
Cutting Tool ◽  
Weight Ratio ◽  
Rake Face ◽  
Cryogenic Machining ◽  
Tool Insert ◽  
Face Temperature

Abstract Titanium alloys are widely used as mechanical components, since they have superior properties such as high strength-to-weight ratio. They are regarded as difficult-to-cut materials. Their low thermal conductivity increases the temperature near the cutting edge, which causes excessive tool wear during cutting. Recently, many studies on cryogenic machining have been conducted. Cryogenic machining has emerged as an environmentally friendly alternative to traditional emulsion coolants. In this study, the rake face temperatures of cutting tool in the turning of titanium alloy under dry, soluble coolant, cryogenic carbon dioxide coolant and liquid nitrogen coolant conditions were measured to clarify the effect of coolant on cutting temperature. Turning tests were performed using a precision lathe. Tool insert was made by a translucent alumina. A small hole was drilled into the tool insert. An infrared radiation pyrometer with an optical fiber was used. The optical fiber was inserted into the hole. During chip formation, the infrared rays, radiated from the tool-chip interface and transmitted through the cutting tool, were accepted and transmitted by the optical fiber. The effects of cryogenic coolant on the rake face temperature were investigated. The rake face temperatures under carbon dioxide cooling and liquid nitrogen cooling were approximately 60 °C and 90 °C lower than that in dry cutting, respectively.

Experimental Research of Effective Cutting Speed Influence on Surface Roughness in Ball End Milling of C45 Material with Hardness 34 HRC

2014 ◽  
Vol 657 ◽  
pp. 53-57 ◽  
Author(s):  
Sándor Ravai Nagy ◽  
Ioan Paşca ◽  
Mircea Lobonțiu ◽  
Mihai Banica
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Experimental Research ◽  
Inclination Angle ◽  
Cutting Tool ◽  
End Milling ◽  
Cutting Speed ◽  
Cnc Machine Tools ◽  
Machined Surface ◽  
Ball End Milling

Machining of Complex Concave or Convex Surfaces Requires the Use of Ball End Milling Cutters. Obtaining the Expected Surface Quality Compete Various Technological Factors which should be Taken into Account. Following the Machining of the Surface with Different Inclination Angles between the Cutting Tool Axes and the Machined Surface, Significant Changes of the Surface Roughness have been Observed. Based on the Tests Performed, we can Determine the Range of the Tool Inclination Angle, which is the Best for the Surface Quality. we have also Made a Correlation between the Cutting Speeds, Inclination Angle of the Cutting Tool Toward the Machined Surface for an Obtained Surface Quality. the Presented Results are Based on Experimental Research in Industrial Conditions by Using CNC Machine Tools with 5 Axes. the Tests have been Performed on the C45 Material, Heat Treated to 34HRC.

Development of a Cutting Tool with Micro Built-In Thermocouples - Characteristic of the Micro Cu/Ni Thermocouples Fabricated by Electroless Plating and Electro Plating

2012 ◽  
Vol 523-524 ◽  
pp. 815-820
Author(s):  
Junichi Harashita ◽  
Yuji Tomoda ◽  
Jun Shinozuka
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Seebeck Coefficient ◽  
Electroless Plating ◽  
Cutting Tool ◽  
Cutting Temperature ◽  
Measuring Method ◽  
Rake Face ◽  
Tool Insert ◽  
Cu Film

This study has devised a tool insert with micro built-in thermocouples in order to establish a cutting-temperature measuring method for practical use. This tool insert possesses seven pairs of micro Cu/Ni film thermocouple near the cutting edge on the rake face. In this study, Cu film and Ni film were deposited in the micro grooves corresponding to a circuit pattern of the micro thermocouple by means of electroless plating and electroplating. This paper shows the results of the investigation concerning the electrical properties of the micro Cu/Ni film thermocouples. The influence of the current density in electroplating on the electrical resistivity of the films was examined. The characteristic of the Seebeck property of the micro Cu/Ni film thermocouple was investigated in a temperature difference of up to 600 K with a heating apparatus developed. The Seebeck coefficient of the micro Cu/Ni film thermocouple was smaller by 28 % than that of a Cu/Ni wire thermocouple. The result implies that the degradation in the Seebeck property of the micro Cu/Ni film thermocouple derives from an existence of an impurity between Cu film and Ni film in the hot junction.

Improving Tool Wear Resistance in Inconel 718 Cutting by Considering Surface Microstructures of CBN Cutting Tool

2016 ◽  
Vol 1136 ◽  
pp. 561-566
Author(s):  
Tatsuya Sugihara ◽  
Shota Takemura ◽  
Toshiyuki Enomoto
Keyword(s):  
Wear Resistance ◽  
Inconel 718 ◽  
Cutting Tool ◽  
Orthogonal Cutting ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Polished Surface ◽  
Rake Face ◽  
Crater Wear ◽  
Surface Microstructures

Nickel-based superalloys such as Inconel 718 are known as one of the most difficult-to-cut materials due to their mechanical and chemical properties and the tool life is extremely short. Recently, Cubic-Boron-Nitride (CBN) has received a considerable attention as a material for cutting tools and has been considered to be a major candidate for high performance cutting of Inconel 718. However, the detailed wear behavior of CBN tools in cutting of Inconel 718 is not sufficiently understood yet, and the performances of CBN tools are still insufficient in practical use. To overcome this problem, we first conducted orthogonal cutting experiments on Inconel 718 at low (20 m/min) and high (100 m/min) cutting speeds employing CBN cutting tools to clarify the detailed wear mechanisms. Moreover, relationship between surface microstructures of the cutting tool and wear resistance was investigated. As a result, it was found that a rake face with micro grooves significantly suppressed the crater wear at low cutting speed, although polished surface rake face reduced the initial crater wear by approximately 40 % compared to the non-polished tool in high speed cutting of Inconel 718.

scholarly journals Measurement of the Temperature Distribution at the Tool-Chip Interface by Using a Cutting Tool with Seven Pairs of Built-In Micro Cu/Ni Thermocouples

2016 ◽  
Vol 1136 ◽  
pp. 586-591 ◽  
Author(s):  
Jun Shinozuka ◽  
Habibah binti Jaharadak
Keyword(s):  
Aluminum Alloy ◽  
Heat Conduction ◽  
Temperature Distribution ◽  
High Performance ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Rake Face ◽  
Machining Performance ◽  
Unsteady Heat Conduction ◽  
Indexable Insert

Knowing temperatures at the tool-chip interface is extremely important to optimize the machining condition and to improve the machining performance, furthermore to design high performance materials. In order to grasp the temperature distribution at the tool-chip interface, this study has devised an indexable insert with seven pairs of built-in micro Cu/Ni thermocouples on the rake face near the cutting edge. This paper shows the performance of the indexable insert with built-in micro thermocouples developed. The thickness of each element of the micro thermocouple is approximately 15 μm. The result of unsteady heat conduction analysis employing FEM shows that the temperature difference by installing the micro thermocouples is less than 10 K or 1.2 %. The temperature measurement experiments by cutting of aluminum alloy were carried out by changing the cutting speed. The results provided the evidence that the temperature distribution at the tool-chip interface can be grasped with the indexable insert with built-in micro thermocouples developed.

scholarly journals Characterization and Parametric Optimization of Performance Parameters of DLC-Coated Tungsten Carbide (WC) Tool Using TOPSIS

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 760
Author(s):  
Ramakant Rana ◽  
R. S. Walia ◽  
Qasim Murtaza
Keyword(s):  
Tungsten Carbide ◽  
Process Parameters ◽  
Feed Rate ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Optimum Process ◽  
Carbide Tool ◽  
Tool Insert ◽  
Dlc Coating ◽  
Tungsten Carbide Tool

In this work, we have deposited the diamond-like carbon (DLC) coating on the tungsten carbide (WC) tool insert using the thermal chemical vapor deposition (CVD) method. For the growth of DLC coating, sugarcane bagasse was used as a carbon precursor. Raman spectroscopy, a field emission scanning electron microscope (FESEM), and X-ray diffraction (XRD) were used to confirm the presence of DLC coating on the tungsten carbide tool inserts. The hardness tests were also performed for inspecting the microhardness induced by the self-developed DLC coating on the tungsten carbide (WC) tool insert. To determine the optimum process parameters for the turning operation on an aluminum (6061) workpiece using a self-developed DLC-coated tungsten carbide (WC) tool insert, we have applied the technique for order preference by similarity to ideal solution (TOPSIS) methods. The process parameters considered for the optimization were feed rate, cutting speed, and depth of cut. Whereas chosen response variables were flank wear, temperature in the cutting zone, and surface roughness. TOPSIS is utilized to analyze the effects of selected input parameters on the selected output parameters. This study in this paper revealed that it was advantageous to develop the DLC coating on the tungsten carbide tool inserts for the machining applications. The results also revealed that a 0.635 mm depth of cut, feed rate of 0.2 mm/rev, and cutting speed of 480 m/min were the optimum combination of process parameters.

Research on Transient Temperature of Cutting Tool during High Speed Slot Milling of AISI H13

2014 ◽  
Vol 800-801 ◽  
pp. 715-719
Author(s):  
Fu Lin Jiang ◽  
Zhan Qiang Liu ◽  
Yi Wan ◽  
Han Zhang
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Transient Temperature ◽  
H13 Steel ◽  
Tool Insert ◽  
Slot Milling ◽  
Aisi H13 Steel ◽  
Aisi H13 ◽  
Cutting Model

Cutting tool temperature is the main factor that directly affects tool wear and tool life. In this paper we developed temperature model of tool insert during slot milling process, constructed by a combination of cutting time model and non-cutting model. A set of experiments are designed and carried out to obtain cutting induced temperatures at different cutting speeds during slot milling of AISI H13 steel. Experiments results indicate that tool insert temperature increases first and then decreases as the cutting speed grows, and a critical cutting speed for the tool insert temperature exists during slot milling of AISI H13 steel. Some possible reasons for the drop of tool insert temperature are proposed and discussed, and they are decreased heat flux into tool insert and increased heat convection coefficient.

Study on Cutting Forces and Surface Finish During End Milling of Titanium Alloy

2014 ◽  
Author(s):  
Krishnaraj Vijayan ◽  
Samsudeen Sadham ◽  
Saikumar Sangeetha ◽  
Kuppan Palaniyandi ◽  
Redouane Zitoune
Keyword(s):  
Experimental Study ◽  
Titanium Alloy ◽  
Cutting Force ◽  
Cutting Tool ◽  
End Milling ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Dry Cutting ◽  
Cutting Speeds

This paper investigates numerical and experimental study of end milling of titanium alloy Ti–6% Al–4% V using carbide insert based cutting tool. The experiments were carried out under dry cutting conditions. The cutting speeds selected for the experiments are 20,30,40,50 mmin–1. The feed rates used in the experiment were 0.02, 0.04, 0.06 and 0.08 mmrev–1, while depth of cut is kept constant at 1.0 mm. For conducting the experiments single insert based cutting tool is based. For a range of cutting speeds and feeds measurements of cutting force, surface roughness and cutting temperature have been recorded. From the experimental study it can be seen that cutting speed has the significant effect on temperature when compared to feed/tooth. Further it is also found that cutting speed of 30 m min−1 and feed rate of 0.02 mm rev−1 could be used for machining Ti alloy. Moreover the experimental and numerical cutting force values are compared.

Assessment of Machining Cost for End-Milling of Ti-6Al-4V Titanium Alloy through RSM-Based Parametric Model

2014 ◽  
Vol 903 ◽  
pp. 83-89
Author(s):  
A.N. Mustafizul Karim ◽  
M. Ikram ◽  
H.M. Emrul Kays ◽  
M. Abdesselam ◽  
T.L. Ginta
Keyword(s):  
Titanium Alloy ◽  
Cutting Tool ◽  
End Milling ◽  
Cutting Parameters ◽  
Cutting Conditions ◽  
Technical Solution ◽  
Machining Processes ◽  
Tool Insert ◽  
The Cost ◽  
Cutting Tool Insert

Past few decades have been marked by significant achievements in the development of cutting tools and machining processes. End-milling operation with Polycrystalline Diamond (PCD) cutting tool insert presents a good technical solution for machining difficult-to-cut materials. However, the cost of each technical or technological solution is a major concern in the decision making process. It is quite common for a solution developer to encounter a question like How much will this new method cost? before proceeding for implementation. PCD insert applied as a cutting tool is a recent development and evaluation of economic performance of this cutting tool insert in end-milling of a-difficult-to-cut material such as Ti-6Al-4V titanium alloy can be of significant importance to the manufacturer. However, cost economy depends significantly on the correct choice of cutting conditions especially in the context of cutting parameters. To determine the economically desired levels of the cutting parameters for PCD insert to end-mill Titanium alloy we have presented a RSM-based mathematical model which would help to estimate the cost of removing unit volume of material and to find out the optimum cutting conditions leading to minimum machining cost.

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