scholarly journals THERMOVISION MEASUREMENTS OF THE TEMPERATURE IN THE CUTTING ZONE FOR TURNING AISI 321 STEEL

2020 ◽  
Vol 1 (23) ◽  
pp. 69-80
Author(s):  
Marian Bartoszuk
Keyword(s):  
Temperature Distribution ◽  
Infrared Imaging ◽  
Rake Face ◽  
Workpiece Material ◽  
Distribution Maps ◽  
Research Problems ◽  
Cutting Zone ◽  
Conducting Research ◽  
Aisi 321 ◽  
Natural Thermocouple

The article presents the methodology of conducting research on temperature distribution in the cutting zone for orthogonal turning without the use of a cooling liquid. AISI 321 austenitic steel was chosen as the workpiece material to be tested, while TNMA160408 carbide inserts, with a flat rake face made of H10F carbide, were chosen as the cutting edges. The research used infrared imaging, which still poses many research problems. The author's own method of calibration of the measurement chain is also presented. In addition, the most common causes of inaccuracies in thermovision measurements of cutting temperatures are discussed. The obtained temperature distribution maps were related to the average contact temperature determined by the method of natural thermocouple – chips/rake face.

Finite Difference Modeling of Cutting Temperature in Machining of A6061-T6 Aluminum Alloy at Ultra High Cutting Speeds

2007 ◽  
Vol 329 ◽  
pp. 681-686 ◽  
Author(s):  
Toshiyuki Obikawa ◽  
Ali Basti ◽  
Jun Shinozuka
Keyword(s):  
Thin Film ◽  
Temperature Distribution ◽  
Finite Difference ◽  
Orthogonal Cutting ◽  
Cutting Temperature ◽  
Rake Face ◽  
Thin Film Thermocouples ◽  
Cutting Zone ◽  
The Finite Difference Method ◽  
Cutting Speeds

The finite difference method was applied to simulate temperature distribution in the workpiece, cutting zone and tool in the orthogonal cutting process with multilayer coated sintered alumina tools. The analysis was conducted under different cutting speeds, while experiments were carried out to measure temperatures in different positions of the tool rake face using tools with built-in thin film thermocouples developed by the authors. The temperature distribution calculated along the rake face was consistent with experimental data. This proved that the finite difference modeling developed can be applied to the prediction of cutting temperatures of aluminum alloys for a range of ultra high cutting speeds.

scholarly journals Temperature and Heat Partition Testing in the Cutting Zone for Turning AISI 321 Steel

2020 ◽  
Vol 66 (11) ◽  
pp. 629-641
Author(s):  
Marian Bartoszuk
Keyword(s):  
Numerical Modelling ◽  
Cutting Tools ◽  
Thermal Characteristics ◽  
Experimental Tests ◽  
Heat Distribution ◽  
Rake Face ◽  
Heat Partition ◽  
Steel Aisi ◽  
Cutting Zone ◽  
Aisi 321

This article shows selected results of experimental tests and the results of analytical and numerical modelling of the thermal characteristics of the cutting process. The tests were conducted for the case of the dry turning of austenitic steel AISI 321 with cutting tools with a flat rake face. The research aimed to determine the actual division of thermal fluxes in the zone of contact between the chip and the rake face. As a result of such work, a formula for a new heat partition coefficient and a formula for calculating the average contact temperature were developed. The results showed that the formulas developed can be a useful tool to estimate heat distribution in the cutting zone quickly.

Research on Sticking Failure Characteristics of Cemented Carbide Blade

2012 ◽  
Vol 500 ◽  
pp. 211-217
Author(s):  
Zhe Li ◽  
Min Li Zheng ◽  
Xian Zhi Chen ◽  
Meng Tong
Keyword(s):  
Electron Microscopy ◽  
Cutting Tool ◽  
Influence Factors ◽  
Rake Face ◽  
Tool Breakage ◽  
Failure Characteristics ◽  
Micro Cracks ◽  
Cutting Zone ◽  
Element Density ◽  
Scanning Electron

Through the analysis on damaged tool in sticking failure experiment by cutting austenitic stainless steel (1Cr18Ni9Ti) with scanning electron microscopy (SME), found that there are micro cracks existent on rake face near the tip of the cutting tool, through the research of the emergence, development and distribution direction of the crack, the direct reason for tool breakage is the crack being out of control. Combining the study of cutting tool element density change in cutting zone and grooving wear on rake face, this paper analyzed the cause of the binding between chip and tool and the influence factors of sticking failure during the cutting process.

Knowing your Place: Gender and Reflexivity in two Ethnographies

2002 ◽  
Vol 7 (2) ◽  
pp. 118-128 ◽  
Author(s):  
Fiona Gill ◽  
Catherine Maclean
Keyword(s):  
Participant Observation ◽  
Emotional Impact ◽  
Community Studies ◽  
Research Experiences ◽  
The North ◽  
Research Problems ◽  
Similarities And Differences ◽  
Conducting Research ◽  
Combination Of Methods ◽  
Gender Specific

Female ethnographers often appear to be more aware of their sexual status and its impact on fieldwork and relationships than their male colleagues (Okely 1992: 19, Coffey 1999: 79). Similarly, the behaviour of female fieldworkers is often more closely scrutinised than that of male fieldworkers (Mascarenhas-Keyes 1987: 187), and many female ethnographers’ accounts detail gender-specific issues and challenges that arose during their research (e.g. Moreno 1995: 220, Whitehead 1976, Middleton 1986). This paper draws on the authors’ experiences in two different rural British communities, conducting research using a combination of methods including participant observation and tape-recorded interviews. Catherine Maclean's research examined migration and social change in ‘Beulach’, a remote rural parish in the north of Scotland, while Fiona Gill's research focused on issues of identity in ‘Bordertown’, a small town near the border between Scotland and England. In both cases, while gender was not initially a focus of the research, it became increasingly salient during the fieldwork period. The paper discusses the similarities and differences between the authors’ research experiences, and the factors that account for these. The authors’ research is set in the wider context of ethnographic community studies. The paper explores the emotional impact of the fieldwork on the authors, and the consequences of this for the research. It concludes that although female researchers have to consider and deal with gender-related research problems not faced by their male colleagues, this also has positive consequences as the experiences of female ethnographers encourage a reflexive and self-aware approach.

scholarly journals Thermal Modeling of Tool Temperature Distribution during High Pressure Coolant Assisted Turning of Inconel 718

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 408 ◽  
Author(s):  
Doriana D'Addona ◽  
Sunil Raykar
Keyword(s):  
High Pressure ◽  
Temperature Distribution ◽  
Inconel 718 ◽  
Tool Temperature ◽  
Machining Processes ◽  
Nickel Chromium ◽  
Work Material ◽  
Cutting Zone ◽  
Overall Performance ◽  
High Pressure Coolant

This paper presents a finite-element modeling (FEM) of tool temperature distribution during high pressure coolant assisted turning of Inconel 718, which belongs to the heat resistance superalloys of the Nickel-Chromium family. Machining trials were conducted under four machining conditions: dry, conventional wet machining, high pressure coolant at 50 bar, and high pressure coolant at 80 bar. Temperature during machining plays a very important role in the overall performance of machining processes. Since in the current investigation a high pressure coolant jet was supplied in the cutting zone between tool and work material, it was a very difficult task to measure the tool temperature correctly. Thus, FEM was used as a modeling tool to predict tool temperature. The results of the modeling showed that the temperature was considerably influenced by coolant pressure: the high pressure jet was able to penetrate into the interface between tool and work material, thus providing both an efficient cooling and effective lubricating action.

scholarly journals Study of ice accretion on wind turbine blade profiles using thermal infrared imaging

2020 ◽  
pp. 0309524X2093394
Author(s):  
Adeel Yousuf ◽  
Jia Yi Jin ◽  
Pavlo Sokolov ◽  
Muhammad S Virk
Keyword(s):  
Temperature Distribution ◽  
Surface Temperature ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Infrared Imaging ◽  
Thermal Infrared ◽  
Ice Accretion ◽  
Blade Profile ◽  
Thermal Infrared Imaging ◽  
Surface Temperature Distribution

Atmospheric icing has been recognized as hindrance in proper utilization of good wind resources in cold regions. There is a growing need to better understand the ice accretion physics along wind turbine blades to improve its performance and for optimal design of anti/de-icing system. This article describes a study of ice accretion along wind turbine blade profiles using thermal infrared imaging. Surface temperature distribution along four different blade profile surfaces is studied at different operating conditions. Analysis shows that surface temperature distribution along blade profile surface during ice accretion process is a dynamic process and change in atmospheric conditions and blade geometric characteristics significantly affects the surface temperature and resultant ice accretion. The effect of blade geometry on ice accretion is more prominent in case of wet ice conditions due to low freezing fraction and water run back along blade profile surface.

P-OS2-1 Development of Nano Temperature Sensor Array for Acquisition of Temperature Distribution on the Rake Face of Cutting Tool

2012 ◽  
Vol 2012.4 (0) ◽  
pp. 245-246
Author(s):  
Keigo ISHII ◽  
Tatsuro FURUSHO ◽  
Naohiko SUGITA ◽  
Reo Kometani ◽  
Sunao ISHIHARA ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Temperature Sensor ◽  
Sensor Array ◽  
Cutting Tool ◽  
Rake Face

Evolution of Temperature Distribution and Microstructure in Multipass Welded AISI 321 Stainless Steel Plates With Different Thicknesses

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Soheil Nakhodchi ◽  
Ali Shokuhfar ◽  
Saleh Akbari Iraj ◽  
Brian G. Thomas
Keyword(s):  
Stainless Steel ◽  
Temperature Distribution ◽  
Residual Stresses ◽  
Arc Welding ◽  
Welding Process ◽  
Steel Plates ◽  
Temperature History ◽  
Transient Temperature ◽  
Multipass Welding ◽  
Aisi 321

Prediction of temperature distribution, microstructure, and residual stresses generated during the welding process is crucial for the design and assessment of welded structures. In the multipass welding process of parts with different thicknesses, temperature distribution, microstructure, and residual stresses vary during each weld pass and from one part to another. This complicates the welding process and its analysis. In this paper, the evolution of temperature distribution and the microstructure generated during the multipass welding of AISI 321 stainless steel plates were studied numerically and experimentally. Experimental work involved designing and manufacturing benchmark specimens, performing the welding, measuring the transient temperature history, and finally observing and evaluating the microstructure. Benchmark specimens were made of corrosion-resistant AISI 321 stainless steel plates with different thicknesses of 6 mm and 10 mm. The welding process consisted of three welding passes of two shielded metal arc welding (SMAW) process and one gas tungsten arc welding (GTAW) process. Finite element (FE) models were developed using the DFLUX subroutine to model the moving heat source and two different approaches for thermal boundary conditions were evaluated using FILM subroutines. The DFLUX and FILM subroutines are presented for educational purposes, as well as a procedure for their verification.

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