Theoretical Modeling of Cutting Temperature Distribution by Considering the Material Thermal Properties as Functions of Temperature

2011 ◽  
Author(s):  
Zheng Kang ◽  
Xia Ji ◽  
Xueping Zhang ◽  
Steven Y. Liang
Keyword(s):  
Thermal Properties ◽  
Temperature Distribution ◽  
Heat Source ◽  
Cutting Temperature ◽  
Temperature Data ◽  
Temperature Elevation ◽  
Temperature Dependent ◽  
Final Temperature ◽  
Plane Symmetric ◽  
Set Up

To better predict the temperature distribution in the tool and chip, a modified theoretical model by considering material thermal properties as temperature dependent is developed to quantitatively describe the temperature elevation due to the shear and friction at the tool-chip interface. Work’s thermal properties of thermal conductivity and specific heat are modified and considered as functions of temperature. The semi-infinite method is utilized in the model, in which the back of the chip and the shear band are assumed as adiabatic. Temperature distribution in the tool and chip is then determined simultaneously by shear and friction. An imaginary heat source is set up to be plane-symmetric with respect to each original heat source in this approach. The effects of original heat source and imaginary heat source are superimposed to calculate the final temperature elevation in the tool and chip. To determine the ratio of total heat transferred into the chip and the tool, it is assumed that the temperatures in the tool and in the chip are in balance along the tool-chip interface in the stable cutting state. The model is experimentally validated with peak temperature data from previous literature. Results indicate that the model-experiment deviation is less than 10% when thermal properties are considered temperature dependent, and it is more accurate than that by considering the thermal properties as constants. The patterns of temperature distribution in the tool and chip are further analyzed by the model.

Analysis of Tempering and Rehardening for Grinding of Hardened Steels

1991 ◽  
Vol 113 (4) ◽  
pp. 388-394 ◽  
Author(s):  
O. B. Fedoseev ◽  
S. Malkin
Keyword(s):  
Thermal Properties ◽  
Heat Source ◽  
Hardened Steel ◽  
Temperature History ◽  
Hardness Distribution ◽  
Temperature Dependent ◽  
Thermally Activated ◽  
Reaction Equations ◽  
Rate Controlling Step ◽  
Good Agreement

An analysis is presented to predict the hardness distribution in the subsurface of hardened steel due to tempering and rehardening associated with high temperatures generated in grinding. The grinding temperatures are modeled with a triangular heat source at the grinding zone and temperature-dependent thermal properties. The temperature history, including the effect of multiple grinding passes, is coupled with thermally activated reaction equations for tempering and for reaustenitization which is the rate controlling step in rehardening. Experimental results from the literature are found to be in good agreement with the analytical predictions.

Calculating of the Temperature Distribution of Primary Shear Zone in Orthogonal High Speed Cutting Based on the Non-Uniform Volume Moving Heat Source

2009 ◽  
Vol 626-627 ◽  
pp. 105-110 ◽  
Author(s):  
Guo He Li ◽  
Min Jie Wang
Keyword(s):  
Temperature Distribution ◽  
Heat Source ◽  
Shear Zone ◽  
High Speed ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Constitutive Relationship ◽  
Moving Heat Source ◽  
High Speed Cutting ◽  
Strain And Strain Rate

A method was presented for calculating the temperature distribution of primary shear zone in orthogonal high speed cutting based on the non-uniform volume moving heat source. The temperature distribution of primary shear zone in orthogonal high speed cutting was calculated by the dynamic plastic constitutive relationship and the distribution of strain and strain rate of primary shear zone. The results show that the temperature distribution of primary shear zone is uneven, from the original plane to the cutoff plane, the cutting temperature increases continuously. In the middle of primary shear zone, the change of cutting temperature is larger, at the position near to original plant and cutoff plane, the change of cutting temperature is smaller. The cutting temperature increases with the increase of cutting speed and cutting depth, but decreases with the increase of rake angle. The comparison with existing method shows that the method presented in this paper is not only available, but also simple, convenient and more accord with the fact of orthogonal high speed cutting.

TEMPERATURE DISTRIBUTION IN SALT DOMES AND SURROUNDING SEDIMENTS

Geophysics ◽  
1966 ◽  
Vol 31 (2) ◽  
pp. 346-361 ◽  
Author(s):  
Franz Selig ◽  
George C. Wallick
Keyword(s):  
Thermal Properties ◽  
Temperature Distribution ◽  
Temperature Data ◽  
Salt Intrusion ◽  
Mathematical Procedure ◽  
Symmetrical Structure ◽  
Salt Domes ◽  
Scale Models ◽  
History Of ◽  
The Media

A straightforward mathematical procedure allows the calculation of the isogeothermal pattern in and about a salt intrusion. Temperature anomalies are controlled not only by the thermal properties of the media, but also are indicative of the geometry and history of the system. As a simple example, an axially symmetrical structure was chosen to illustrate the kind of inferences one can make from the temperature data, such as discrimination between connected and disconnected domes, and the estimation of the vertical velocity of the intrusion. The numerical results confirm and extend the observations in electrolytic scale models (Hubert Guyod, 1946), and augment W. Heroy’s comments on thermal properties of salt, given at the International Conference on Saline Deposits, Houston, 1962.

Heat Transfer of Thin Fins With Temperature-Dependent Thermal Properties and Internal Heat Generation

1967 ◽  
Vol 89 (2) ◽  
pp. 155-162 ◽  
Author(s):  
H. M. Hung ◽  
F. C. Appl
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Temperature Distribution ◽  
Heat Generation ◽  
Analytical Study ◽  
Internal Heat ◽  
Internal Heat Generation ◽  
Temperature Dependent ◽  
Numerical Examples

An analytical study of the temperature distribution along thin fins with temperature-dependent thermal properties and internal heat generation is presented. The analysis utilizes a recently published bounding procedure which yields analytical and continuous bounding functions for the temperature distribution. Several numerical examples are considered. Tabular and graphical results are given. The effects of variable thermal properties and internal heat generation are also shown.

A Novel Method to Simultaneously Identify Temperature-Dependent Thermal Properties and Verification

2019 ◽  
Vol 12 (4) ◽  
Author(s):  
Weizhen Pan ◽  
Fajun Yi ◽  
Lijun Zhuo ◽  
Songhe Meng
Keyword(s):  
Thermal Properties ◽  
Measurement Errors ◽  
Temperature Data ◽  
Random Errors ◽  
Temperature Dependent ◽  
Simulation Experiments ◽  
Marquardt Method ◽  
Inverse Heat Transfer ◽  
Novel Method ◽  
Transfer Problems

Abstract A novel method for the identification of thermal conductivity and specific heat capacity simultaneously by solving inverse heat transfer problems (IHTPs) is proposed. The present method uses a new iterative format of the Levenberg–Marquardt method (LMM) and guarantees global convergence by implementing the subsection identification method. Both simulation and real experiments are conducted to prove the validity and practicability of the proposed method. The thermal properties in simulation and real experiments are identified, respectively, by the proposed method. In the simulation experiments, random errors are added into temperature data to survey the effect of measurement errors on the identification; and the deviations of the results are also compared to that in a published literature to show the superiority of the proposed method. The numerical results illustrate that the identification is accurate and stable. And the identification results of the real experiment are compared with measured ones, proving the practicability of the method.

scholarly journals Temperature distribution of an infinite slab under point heat source

2014 ◽  
Vol 18 (5) ◽  
pp. 1597-1601 ◽  
Author(s):  
Zhao-Chun Wu ◽  
Dao-Lai Cheng
Keyword(s):  
Temperature Field ◽  
Thermal Properties ◽  
Temperature Distribution ◽  
Heat Source ◽  
Manufacturing Processes ◽  
Point Heat Source ◽  
Treatment Processes ◽  
Measuring Devices ◽  
Infinite Slab ◽  
Continuous Point

The temperature field in an infinite slab under an instantaneous or continuous point heat source is studied numerically. The numerical results reveal the temperature distribution and its change regularity, which are significant for the temperature control encountered in many practical manufacturing processes, such as the laser treatment processes on the surface of films, welding and cutting, and even the design of measuring devices for thermal properties of material.

Modelling of the cutting temperature distribution under the tool flank wear effect

2003 ◽  
Vol 217 (11) ◽  
pp. 1195-1208 ◽  
Author(s):  
Y Huang ◽  
S Y Liang
Keyword(s):  
Temperature Distribution ◽  
Tool Wear ◽  
Heat Source ◽  
Shear Zone ◽  
Temperature Rise ◽  
Flank Wear ◽  
Cutting Temperature ◽  
Infinite Medium ◽  
Heat Sources ◽  
Moving Band

The understanding of cutting temperature distribution at the presence of tool wear can aid in addressing important metal cutting issues such as part surface integrity, tool life and dimensional tolerance under practical operating conditions. The effect of tool wear on the cutting temperature distribution was first modelled by Chao and Trigger and there have been very few followers since. In Chao's model, the primary heat source was assumed to have no effect on the workpiece temperature rise and the chip temperature rise was treated as a bulk quantity. This paper analytically quantifies the tool wear effect by taking into account the contributions of the primary heat source and considering the distribution of chip temperature rise. On the chip side, the primary shear zone is modelled as a uniform moving oblique band heat source and the secondary shear zone as a non-uniform moving band heat source within a semi-infinite medium. On the tool side, the effects of both the secondary and the rubbing heat sources are modelled as non-uniform static rectangular heat sources within a semi-infinite medium. For the workpiece side, the study models the primary shear zone as a uniform moving oblique band heat source and the rubbing heat source as a non-uniform moving band heat source within a semi-infinite medium. The proposed model is verified based on the published experimental data in the orthogonal cutting of Armco iron. Furthermore, a comparison case is presented on the temperature variation with respect to cutting speed, feed rate and flank wear length.

Correlation of Electronic and Thermal Properties of Short Channel nMOSFETS

1999 ◽  
Author(s):  
M. Palaniappan ◽  
V. Ng ◽  
R. Heiderhoff ◽  
J.C.H. Phang ◽  
G.B.M. Fiege ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Temperature Distribution ◽  
Heat Generation ◽  
Hot Spots ◽  
Light Emission ◽  
Photon Emission ◽  
Thermal Image ◽  
Short Channel ◽  
Physical Phenomena ◽  
Backside Illuminated

Abstract Light emission and heat generation of Si devices have become important in understanding physical phenomena in device degradation and breakdown mechanisms. This paper correlates the photon emission with the temperature distribution of a short channel nMOSFET. Investigations have been carried out to localize and characterize the hot spots using a spectroscopic photon emission microscope and a scanning thermal microscope. Frontside investigations have been carried out and are compared and discussed with backside investigations. A method has been developed to register the backside thermal image with the backside illuminated image.

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