Analytical Model Approach for Tool Temperature Prediction in Broaching Nickel-Based Alloys

2014 ◽  
Vol 1018 ◽  
pp. 99-106 ◽  
Author(s):  
Sascha Gierlings ◽  
Matthias Brockmann
Keyword(s):  
Analytical Model ◽  
Work Piece ◽  
Heat Sources ◽  
The Novel ◽  
Tool Temperature ◽  
Temperature Prediction ◽  
Contact Conditions ◽  
Cutting Zone ◽  
Clearance Face ◽  
Model Approach

The following article suggest an analytical model approach for tool temperature prediction in broaching nickel-based alloys. The presented approach is based on an existing model proposed by Komanduri and Hou in 2001, however, includes several modifications in order to better describe the phenomena observed in thermo-graphic measurements acquired during broaching experiments. The novel model approach includes different assumptions regarding the location of heat sources in the cutting zone as well as adiabatic boundary conditions. Moreover, an advancement of the model was made to regard variable contact conditions between tool clearance face and work piece caused by tool wear.

Performance Profiling of Nanoparticulate Graphite Powder as Lubricant in the Machining of AISI 1040 Steel under Variable Machining Conditions

2014 ◽  
Vol 984-985 ◽  
pp. 15-24 ◽  
Author(s):  
S. Srikiran ◽  
K. Ramji ◽  
B. Satyanarayana
Keyword(s):  
Particle Size ◽  
Surface Finish ◽  
Cutting Forces ◽  
Solid Lubricant ◽  
Graphite Powder ◽  
Nano Particles ◽  
Chemical Degradation ◽  
Work Piece ◽  
Tool Temperature ◽  
Cutting Zone

The generation of heat during machining at the cutting zone adversely affects the surface finish and tool life. The heat at the cutting zone, which plays a negative role due to poor thermal conductivity, resistance to wear, high strength at high temperatures and chemical degradation can be overcome by the use of proper lubrication. Advancements in the field of tribology have led to the use of solid lubricants replacing the conventional flood coolants. This work involves the use of nanoparticulate graphite powder as a lubricant in turning operations whose performance is judged in terms of cutting forces, tool temperature and surface finish of the work piece. The experimentation revealed the increase in cutting forces and the tool temperature when the solid lubricant used is decreased in particle size. The surface finish deteriorated with the decrease in particle size of the lubricant in the nanoregime.Keywords-Turning, Solid lubricant, Graphite, Minimum Quantity Lubrication, nano–particles,Weight percentage,Frictioncoefficient.

scholarly journals Cutting tool temperature prediction method using analytical model for end milling

2016 ◽  
Vol 29 (6) ◽  
pp. 1788-1794 ◽  
Author(s):  
Wu Baohai ◽  
Cui Di ◽  
He Xiaodong ◽  
Zhang Dinghua ◽  
Tang Kai
Keyword(s):  
Analytical Model ◽  
Cutting Tool ◽  
End Milling ◽  
Prediction Method ◽  
Tool Temperature ◽  
Temperature Prediction

scholarly journals Predictive System of COVID -19 Using Response Based Analytical Model

2021 ◽  
pp. 05-10
Author(s):  
Pallavi Mirajkar ◽  
Rupali Dahake
Keyword(s):  
Analytical Model ◽  
Medical Services ◽  
The Novel ◽  
Response Data ◽  
Proposed Model ◽  
The World

The novel COVID sickness 2019 (COVID-19) pandemic caused by the SARS-CoV-2 keeps on representing a serious and vital threat to worldwide health. This pandemic keeps on testing clinical frameworks around the world in numerous viewpoints, remembering sharp increments in requests for clinic beds and basic deficiencies in clinical equipments, while numerous medical services laborers have themselves been infected. We have proposed analytical model that predicts a positive SARS-CoV-2 infection by considering both common and severe symptoms in patients. The proposed model will work on response data of all individuals if they are suffering from various symptoms of the COVID-19. Consequently, proposed model can be utilized for successful screening and prioritization of testing for the infection in everyone.

Principle and Simulation Study on Multi Point-Single Point Incremental Combined Forming for Sheet Metal

2009 ◽  
Vol 626-627 ◽  
pp. 273-278 ◽  
Author(s):  
X.J. Li ◽  
Ming Zhe Li ◽  
C.G. Liu ◽  
Zhong Yr Cai
Keyword(s):  
Sheet Metal ◽  
Single Point ◽  
Experimental Result ◽  
Work Piece ◽  
The Novel ◽  
Forming Process ◽  
Explicit Finite Element ◽  
Forming Defect ◽  
Forming Technology ◽  
Elastic Cushion

Based on Multi-Point (MP) forming technology and Single-Point Incremental (SPI) forming technology, MP-SPI combined forming method for sheet metal is proposed, the principle and two different forming techniques are illustrated firstly. Then the paper is focused on numerical analysis for the novel forming technique with explicit Finite Element (FE) algorithm. During simulation of spherical work-piece, dimpling occurs as a main forming defect in MP-SPI combined forming process. Simulation results show that the dimpling defect can be suppressed effectively by using elastic cushion. An appropriate thickness of elastic cushion is necessary to prevent dimpling. And also the deformation of the work-piece is sensitive to the shape of elastic cushion. The combined forming test shows that the numerical simulation result is closed to the experimental result.

Analytical Modeling of Machining Forces and Friction Characteristics in Ultrasonic Assisted Turning Process

2021 ◽  
pp. 1-13
Author(s):  
Jay Airao ◽  
Chandrakant Kumar Nirala
Keyword(s):  
Analytical Model ◽  
Work Piece ◽  
Contact Ratio ◽  
Friction Characteristics ◽  
Machining Forces ◽  
Ultrasonic Assisted ◽  
Predicted Model ◽  
Ss 304 ◽  
Intermittent Cutting ◽  
Conventional Machining

Abstract Intermittent cutting characteristics of Ultrasonic assisted turning (UAT), Compared to conventional turning (CT), has shown a significant enhancement in the machinability of hard-to-cut materials. The enhancement in machinability is associated with machining forces and friction characteristics of the process. The present article covers an analytical approach to predict the output responses such as machining forces and friction characteristics in UAT and CT processes. Specific cutting energy (SCE) for a particular work-piece material was considered to predict the output responses. The predictions were made by considering the conventional machining theories. Experiments for the UAT and the CT of SS 304 were carried out to validate the predicted model. The results from the analytical model showed that the shear angle increases and the tool-workpiece contact ratio (TWCR) decrease with an increase in amplitude and frequency of vibration. The results obtained from the analytical model were found to be in close agreement with the experimental ones, with an approximate error of 2-20%.

scholarly journals Method for Analytical Calculation of the Formability from Metallic Bipolar Plates

2019 ◽  
Vol 4 (1) ◽  
pp. 1 ◽  
Author(s):  
Nico Keller ◽  
Alexander Bauer ◽  
Thomas von Unwerth ◽  
Birgit Awiszus
Keyword(s):  
Analytical Model ◽  
Early Development ◽  
Cross Section ◽  
Analytical Calculation ◽  
Good Method ◽  
Channel Cross Section ◽  
Experimental Investigations ◽  
Channel Geometry ◽  
Development State ◽  
Model Approach

The constructive design of a flow field layout and the channel cross section parameters from a metallic half- or bipolar plate can have a significant influence on the performance characteristics of a fuel cell. One important aspect in the dimensioning of the channel geometry of half plates is the technical forming feasibility. In this article, first an equation is presented, which enables an analytical calculation of the channel parameters. Hereby, continuing calculations with parameter variations will be possible. Furthermore, the formability of the channel geometry of metallic half plates is evaluated through numerical and experimental investigations. Based on the results, an analytical model approach will be derived that enables an appraisal of the formability from channel cross section contours in an early development state. As a final step, the results of the numerical investigations and the analytical calculation method are compared and evaluated with the results of experimental investigations and other publications. It will be shown, that the derived analytical model approach has a good approximation compared to the effects and results from the numerical and experimental analysis. In particular, the assessment of whether a channel cross section can be manufactured safely is a result with high probability of the analytical model approach. Imprecisions happen, especially in variants with extreme geometries, for example, with very small radii or a huge channel depth. For this kind of variations, the analytical model behaves too sensitively, which makes it more difficult to estimate the damage effects. However, at an early development state, the analytical model offers a good method to get a pre-evaluation of the formability of channel cross sections with a simultaneous parameter variation possibility.

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 Friction Measurement under Consideration of Contact Conditions and Type of Lubricant in Bulk Metal Forming

Lubricants ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 12 ◽  
Author(s):  
Philipp Kramer ◽  
Peter Groche
Keyword(s):  
Friction And Wear ◽  
Solid Lubricants ◽  
Cold Forging ◽  
Work Piece ◽  
Contact Conditions ◽  
Dimensional Precision ◽  
Tribological System ◽  
Contact Kinematics ◽  
Tool Coating ◽  
The Cost

The tribological system plays a critical part in designing robust and efficient cold forging operations. The appropriate selection of lubrication allows to forge defect-free workpieces with high dimensional precision and desired surface finish while ensuring that no defects, such as cracks or seams, occur. Additionally, friction and wear are highly affected by the choice of tribological system, which in turn influence the cost-effectiveness of the forging operation by preventing premature tool failure. Next to the employed tool coating and work piece material, the lubrication system and work piece surface topography are the main factors influencing the aforementioned constraints when designing efficient forging operations. In order to choose the appropriate tribological system before implementing it within an industrial forging operation, tribometers are used to characterize the performance of the tribological system. In this paper, the necessity to account for not only the tribological loads when designing these tribometer tests as is typical for existing methodologies, but also for process and lubricant specific properties will be highlighted. With the help of the tribometer sliding compression test, it will be shown that using liquid lubricants necessitates the need to account for the escape of lubricant, while this is not true for solid lubricants. The escape of lubricant from the contact zone is governed by lubricant properties as well as the contact kinematics and may lead to significantly different results regarding friction and wear. In order to account for this escape, the tribometer test must be specifically designed to reproduce the contact kinematics of the investigated industrial forging operation.

An Experimental Study on Edge-Breakage of Explosive Parts in Machining Using Micro-Photographic Observation Method

2012 ◽  
Vol 214 ◽  
pp. 370-374
Author(s):  
Wei Tang ◽  
Wei Liu ◽  
Qing Xi ◽  
Tong Liu ◽  
Ding Guo Zhang
Keyword(s):  
Final Stage ◽  
Rake Angle ◽  
Sharp Edge ◽  
Work Piece ◽  
Initial Stage ◽  
Deep Rock ◽  
Cutting Zone ◽  
Extension Direction ◽  
Weak Surface ◽  
Observation Method

Crack on the sharp edge remains a major concern and a key problem cries for solution in the course of explosive cutting currently. The adoption of the idea that enlarges the cutting zone and records the cutting behaviors again has founded the micro-photographic system for the cutting process. Tests have found that this system can be applied to research the nucleation and expansion of deep rock crack and the formation and dropping of the chips. The extension direction that controls the cracks is the key to resolve the cracks on the sharp edge. As for the initial stage of cutting, the cracks usually expand from the relatively weak surface of the work piece, while the final stage of the cutting, the cracks point to the weak end face through the inner part of the work piece. The latter is easier to have the cracks on the sharp edge comparing to the former. Working orthogonal rake of tool is an important factor that affects the extension direction of the cracks. At the final stage of the cutting, if the working orthogonal rake is -6°, the angel from the crack extension direction to the main cutting direction is -35°. When the working orthogonal rake is 9°, the angel turns to be -54°. This has shown that enlarging the working orthogonal rake to a certain extend can lower the degree of crack on the sharp edge. In addition, tests have found out that the relatively small working orthogonal rake is likely to bring out potential cracks. However, enlarging the rake angle excessively will lower the rigidity of the tool and thus add risks of shocking.

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