Evaluating Cutting Fluid Effects on Cylinder Boring Surface Errors by Inverse Heat Transfer and Finite Element Methods

1999 ◽  
Vol 122 (3) ◽  
pp. 377-383 ◽  
Author(s):  
Y. Zheng ◽  
H. Li ◽  
W. W. Olson ◽  
J. W. Sutherland
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Integral Transform ◽  
Heat Convection ◽  
Cutting Fluid ◽  
Transfer Model ◽  
Surface Error ◽  
Actual Surface ◽  
Surface Errors ◽  
Inverse Heat Transfer

Sets of dry and wet boring experiments are conducted to estimate the amount of heat transferred into the workpiece and the cutting fluid heat convection coefficient in a boring operation by an inverse heat transfer method. The temperature distribution in the bore is predicted using a heat transfer model that includes heat convection on the inner and outer bore walls. The developed model is solved by an integral transform approach. The thermal expansion of the bore is then calculated using the finite element method (FEM). Surface error due to the cutting forces is also predicted using FEM and added to the thermally induced surface error to give the total surface error. The actual surface error of bores machined under dry and wet cutting conditions are measured and compared with the predicted surface error. Very good agreement between measured and predicted surface errors is observed. [S1087-1357(00)00802-9]

Rolling-Element Bearing Heat Transfer—Part I: Analytic Model

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
William M. Hannon
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Integral Transform ◽  
Rolling Element Bearing ◽  
System Level ◽  
Transfer Model ◽  
Element Analysis ◽  
Transform Method ◽  
Rolling Element ◽  
Element Bearing

The complexities of analyzing rolling element bearings vary. Vendors offer cataloged solutions comprised of limiting loads and speeds, bearing life, and lubricant recommendations. These guidelines meet the needs of most customers; however, more demanding applications warrant advanced analyses. This work focuses on thermal management. Current literature offers system level solutions using either resistance methods or finite element analysis (FEA). Resistance methods have rapid computation time, yet lack accuracy. Finite element methods improve the accuracy, but are computationally cumbersome. This work proposes an integral transform method. The rapidly computed solution yields accurate results. The methodology and results of this work are presented in a three-part series. Part I details existing literature and provides the framework for a new heat transfer model. This model describes rolling-element bearing systems containing a shaft, housing, and numerous bearing raceways. It also includes gears, cooling jackets, and is applicable for several methods of lubrication. The model consists of solid component partial differential equations (PDEs) in conjunction with analytic expressions for fluid temperatures, convection equation, and mass flow. Part II presents the housing, shaft, and bearing raceway PDE solutions. Part III offers experimental validation, as well as observations from experiments on fluid flow within the bearing.

A Thermal Model to Predict Tool Temperature in Machining of Ti-6Al-4V Alloy With an Atomization-Based Cutting Fluid Spray System

2016 ◽  
Author(s):  
Asif Tanveer ◽  
Deepak Marla ◽  
Shiv G. Kapoor
Keyword(s):  
Heat Transfer ◽  
Interaction Model ◽  
Spray Cooling ◽  
Droplet Surface ◽  
Cutting Fluid ◽  
Design Parameters ◽  
Transfer Model ◽  
Tool Temperature ◽  
Spray System ◽  
Heat Transfer Phenomenon

In this study a heat transfer model of machining of Ti-6Al-4V under the application of atomization-based cutting fluid spray coolant is developed to predict the temperature of the cutting tool. Owing to high tool temperature involved in machining of Ti-6Al-4V, the model considers film boiling as the major heat transfer phenomenon. In addition, the design parameters of the spray for effective cooling during machining are derived based on droplet-surface interaction model. Machining experiments are conducted and the temperatures are recorded using the inserted thermocouple technique. The experimental data are compared with the model predictions. The temperature field obtained is comparable to the experimental results, confirming that the model predicts tool temperature during machining with ACF spray cooling satisfactorily.

The Thermo-Mechanical Couple Analysis Base on Assembly

2013 ◽  
Vol 467 ◽  
pp. 416-419
Author(s):  
Gui Chuan Hu ◽  
Jing Hua Liu
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Stress Intensity ◽  
Cylinder Head ◽  
Thermal Load ◽  
Tensile Force ◽  
Heat Transfer Analysis ◽  
Transfer Model ◽  
Sealing Performance ◽  
Steady Heat

Finite element simulation technology was applied to the steady heat transfer and thermo-mechanical coupling analysis in order to investigate the influence of thermal load on stress intensity and sealing performance. An finite element heat transfer model of cylinder head joint assembly was set up, based on which the steady heat transfer analysis was performed subsequently by applying reasonable boundary conditions and loads. The influence on cylinder head sealing performance due to thermal field under the thermal stress conditions was evaluated by using the finite element method. The results showed that the thermal load increases the bolt tensile force and the gasket pressure, which help to improve the sealing performance. Compared to the mechanical load case, the thermo-mechanical stress of the liner and the cylinder head is obviously increased, so the thermal load is not neglect able when calculating the stress intensity of the cylinder head and the cylinder liner.

scholarly journals A Fluidized Bed Combustion Heat Transfer Model Using Finite Elements

1982 ◽  
Author(s):  
P. E. Jenkins ◽  
T. W. Richardson
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Fluidized Bed ◽  
Three Dimensional ◽  
Polar Coordinates ◽  
Transfer Model ◽  
Fluidized Bed Combustion ◽  
Combustion Heat ◽  
Transfer Rates ◽  
Element Technique

This paper deals with the analysis of the axisymmetric heat transfer which occurs in a cylindrical combustion chamber using the finite element technique. The formulation of the equations used in the finite element method presented in this paper begins with the derivation of the heat conduction in three-dimensional polar coordinates. Through a series of transformations, the Poisson’s equation is numerically integrated to obtain the surface temperatures and overall heat transfer rates for the fluidized bed model. Several examples are given to demonstrate the application of the finite element principles to a thermal problem.

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