Heat Transfer Aspects of Nonisothermal Axisymmetric Upset Forging

Dadras, P.; Wells, W. R.

doi:10.1115/1.3185932

Cited by 32 publications

(6 citation statements)

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“…A further method was based on matching the experimentally measured temperature with analytical and/or numerical solutions for various values of h. The interface heat transfer coefficient was taken to be the value which provided the best match between simulation and experimental results [23,24,26].…”

Section: Methods Used Previously For the Estimation Of The Interface mentioning

confidence: 99%

“…Another method was based on the solution of an inverse problem; a sequential inverse method was used to determine the thermal contact conductance in metal-forming processes [25]. A further method was based on matching the experimentally measured temperature with analytical and/or numerical solutions for various values of h. The interface heat transfer coefficient was taken to be the value which provided the best match between simulation and experimental results [23,24,26].…”

Section: Methods Used Previously For the Estimation Of The Interface Heat Transfer Coefficientmentioning

confidence: 99%

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An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining

Iqbal

Mativenga²,

Sheikh³

2008

Proceedings of the Institution of Mechanical Engineers, Part B:

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This paper is concerned with the development of an experimental set-up and finite element (FE) modelling of dry sliding of metals to estimate the interface heat transfer coefficient. Heat transfer between the chip, the tool, and the environment during the metalmachining process has an impact on the temperatures and on the wear mechanisms, and hence on the tool life and on the accuracy of the machined component. For modelling of the metal-machining process, the interface heat transfer coefficient is an important input parameter to quantify the transfer of heat between the chip and the tool and to predict the temperature distribution accurately within the cutting tool. In previous studies involving FE analysis of the metal-machining process, the heat transfer coefficient has been assumed to be between 10 kW/m 2 C and 100 000 kW/m 2 C, with a background from metal-forming processes (especially forging). Based on the operating characteristics, metal-forming and metal-machining processes are different in nature. Hence there was a need to develop a procedure close to the metal-machining process, to estimate this parameter in order to increase the reliability of FE models. To this end, an experimental set-up was developed in which an uncoated cemented carbide pin was rubbed against a steel workpiece while the later was rotated at speeds similar to the cutting tests. This modified pin-on-disc set-up was equipped with temperature and force-monitoring equipment. An FE model was constructed for heat generation and frictional contact. The experimental and modelling results of the dry sliding process yield the interface heat transfer coefficient for a range of rubbing speeds.

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Section: Methods Used Previously For the Estimation Of The Interface mentioning

confidence: 99%

Section: Methods Used Previously For the Estimation Of The Interface Heat Transfer Coefficientmentioning

confidence: 99%

An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining

Iqbal

Mativenga²,

Sheikh³

2008

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…The rolls were rotated in the same direction at a constant velocity n = 36 rpm, and simultaneously travelled relative to the axis of the work piece at a constant velocity v = 2.0 mm/s. The friction factor m on the material-tool contact was set to 1 [7], the material-tools heat transfer coefficient was 30 kW/m 2 K [8], while the heat transfer coefficient between the material and the environment was set to 0.35 kW/m 2 K [9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Billet Wall Thickness on the Rotary Compression Process for Hollow Parts

Tomczak

Bulzak

Pater

2015

SV-JME

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This paper presents the numerical and experimental results of investigating the effect of geometrical parameters of tubular specimens on the rotary compression process for hollow axisymmetric shafts with central necking, and their accuracy. The numerical investigation was performed using the finite element method (FEM) with the Simufact Forming simulation software suite. The simulations investigated the effect of tubular specimen wall thickness on the kinematics of metal flow and the geometry of produced shafts. The results were validated in experimental tests using a forging machine designed specifically for this purpose. Highlights • A new method for producing hollow parts is presented. • The relationship between the wall thickness of a tubular specimen and rotary compression is investigated.• The effect of wall thickness on the rotary compression process is studied both numerically and experimentally.• The distributions of effective strain and temperature are determined by the finite element method.• The variations in length and thickness of the work piece wall are determined, too.

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“…These simulation techniques for die design have been introduced even into medium-and small-sized forging companies in Japan. For dies used in hot forging, die life is affected largely by thermal load; therefore, temperature, thermal deterioration and thermal softening of dies should be estimated [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Although significant changes in the temperature field of dies occur at the initial stage of forging or at the restart after a pause during forging, the temperature gradually achieves a steady thermal cycle after 20-30 shots.…”

Section: Introductionmentioning

confidence: 99%

Effects of simulation conditions on evaluation of tool temperature in hot extrusion-forging

Minami

Marumo

Saiki

et al. 2006

Journal of Materials Processing Technology

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Heat Transfer Aspects of Nonisothermal Axisymmetric Upset Forging

Cited by 32 publications

References 0 publications

An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining

An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining

The Effect of Billet Wall Thickness on the Rotary Compression Process for Hollow Parts

Effects of simulation conditions on evaluation of tool temperature in hot extrusion-forging

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