Exact and approximate methods for determining the thermal parameters of the forging process

Polozine, Alexandre; Schaeffer, Lírio

doi:10.1016/j.jmatprotec.2005.06.041

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…The emissivity of the AISI 1045, Al2O3, and TiN steels were considered constant, and their values were obtained, respectively, from Polozine and Schaeffer [32], Wang et al [33], and Hou et al [34] and are shown in Table 2.…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

Thermal Influence Analysis of Coatings and Contact Resistance in Turning Cutting Tool using Comsol

Ribeiro

Ferreira

Silva

2021

Preprint

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In machining processes, cutting tools reach temperatures higher than 900ºC, thus deteriorating their mechanical properties. To reduce this problem, cutting tools are coated with materials possessing thermal insulation characteristics. Such coatings benefit machining, providing faster cutting speeds and tools life. However, the heating of the tools is still present. Therefore, this work simulates the transient heating phenomenon of a tool and its tool holder, considering the presence of the coating. The effects of convection, radiation, and contact resistance between the tool and the tool holder are also considered. The thermophysical properties of the tool elements depend on temperature. Experimental measurements of parameters related to contact resistance were carried out to make the thermal model closer to real situations. The COMSOL program was used to solve the heat diffusion equation using the Finite Element Method. Comparisons of calculated temperatures are presented for the uncoated (substrate only) and coated inserts with aluminum oxide (Al2O3) and titanium nitride (TiN), respectively. Finally, the results and the consequences of the assembly parameters in the fields of temperature and contact resistance are discussed.

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Section: Thermophysical Propertiesmentioning

confidence: 99%

Thermal Influence Analysis of Coatings and Contact Resistance in Turning Cutting Tool using Comsol

Ribeiro

Ferreira

Silva

2021

Preprint

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“…As proposed in a forging process [37], the same methodology was used to determine the convective heat transfert coefficient. A tube was placed in a oven until its temperature reaches 180 • C. Then it was put outside of the oven and its natural cooling was recorded with a thermocouple.…”

Section: Convection Heat Transfert Coefficientmentioning

confidence: 99%

Cold drawing of 316L stainless steel thin-walled tubes: Experiments and finite element analysis

Palengat

Chagnon

Favier

et al. 2013

International Journal of Mechanical Sciences

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Drawing process of thin walled tubes used to fabricate catheters and stents for medical applications was studied. Medical use needs accurate dimensions and a smooth finish of the inner and outer surfaces. This paper deals with 316L stainless steel tubes which are manufactured by means of cold drawing with or without inner plug (mandrel drawing and hollow sinking, respectively). To improve the quality of the finish of the tubes, numerical modelling can be used. In this way, a thermomechanical study of the drawing process is proposed to determine experimentally the physical parameters. This study proposes to evaluate the different parameters of the constitutive equations, of the thermal and friction models using specific experimental tests or using an inverse analysis on the drawing process. These parameters are validated by analysing other tube drawings. Finally the importance of physical parameters fit on drawing limits is emphasised, using a Cockcroft-Latham failure criterion.

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“…In particular, heat transfer plays a fundamental role in hot stamping, because its value governs the cooling rate experienced by the sheet during forming, and thus the phase transformations that take place inside the component. Literature reports are available about the identification of the heat transfer coefficient (HTC) between workpiece and dies in high-temperature bulk metal-forming operations [12][13][14]: they present experimental and numerical procedures that can be partly applied to the hot stamping case. In addition, boundary conditions are usually evaluated by considering dies made of hot working steels, which are the industrially used materials [9].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in hot stamping of high-strength steel sheets

Tondini

Bosetti

Bruschi

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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This paper focuses on the determination of the heat transfer coefficient (HTC) between blanks and dies in the hot stamping of high-strength steel sheets. Experiments to record the temperature evolution inside the dies were carried out on custom-built test equip- ment, where process conditions typical of hot stamping could be reproduced, but avoiding any deformation of the metal sheet. The HTC was determined by using an inverse analysis procedure, based on the comparison between temperature measured inside the dies and temperatures calculated by means of a numerical model of the test. HTCs between the steel blank and dies made of different materials were identified, showing that the use of ceramic inserts can modify the cooling rate inside the blank in order to avoid a complete martensitic transformation. Moreover, the influence of the contact pressure was investigated, proving that HTC dependence on this factor is not negligible

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Exact and approximate methods for determining the thermal parameters of the forging process

Cited by 10 publications

References 2 publications

Thermal Influence Analysis of Coatings and Contact Resistance in Turning Cutting Tool using Comsol

Thermal Influence Analysis of Coatings and Contact Resistance in Turning Cutting Tool using Comsol

Cold drawing of 316L stainless steel thin-walled tubes: Experiments and finite element analysis

Heat transfer in hot stamping of high-strength steel sheets

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