Continual induction hardening of axi-symmetric bodies

Doležel, Ivo; Barglik, J.; Ulrych, B.

doi:10.1016/j.jmatprotec.2004.07.035

Cited by 21 publications

(6 citation statements)

References 2 publications

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“…It is described in [5]. As a case study of the horizontal CISH method the induction hardening of conical mandrels used as a tool for tube manufacturing [6] or long tubes applied in underground mining for sand transportation [7] has been presented. As an example of the circumferential CISH method the induction hardening of circular saws applied for cutting of slabs in continuous casting lines of steel is described in [8].…”

Section: Kinds Of Ish Processesmentioning

confidence: 99%

Archives of Electrical Engineering

Barglik¹

2018

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Induction surface hardening means the hardening of a thin zone of the material only, while its core remains soft. The paper deals with the modelling of the Consecutive Dual Frequency Induction Hardening (CDFIH) of gear wheels and its validation. For gear wheels with modulus m smaller than 6 mm a contour profile of hardness distribution could be obtained. The investigated gear wheel is heated first by a medium frequency inductor to the temperature approximately equal to the modified lower temperature Ac 1m . It means beginning of the austenite transformation. Then the gear wheel is heated by the high frequency inductor to the hardening temperature making it possible to complete the austenite transformation and immediately cooled. In order to design the process it is necessary to identify modified critical temperatures and to obtain expected temperature distribution within the whole tooth.

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Section: Kinds Of Ish Processesmentioning

confidence: 99%

Archives of Electrical Engineering

Barglik¹

2018

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“…Moreover, the material parameters are temperature-dependent functions that must be found experimentally. The first mathematical and corresponding computer model for solution of the problem was suggested by the authors in Doležel et al (2003). But even when being relatively sophisticated, the methodology suffered from several simplifications enforced by lack of experimental data and possibilities of available software.…”

Section: Modelling Of Continual Inductionmentioning

confidence: 99%

Modelling of continual induction hardening in quasi‐coupled formulation

Barglik

Doležel

Karban

et al. 2005

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Purpose -As far as the authors know, no sufficiently complete model of continual induction hardening was developed and solved so far. The paper presents both mathematical model of the process and algorithm of its solution in the quasi-coupled formulation. Design/methodology/approach -Computation of electromagnetic and temperature fields is based on the finite element method, while time variable boundary conditions are determined by means of an original theoretically-empirical procedure. Findings -Substantial are backgrounds for design of the inductor and parameters of the field current as well as parameters of the cooling medium. Research/limitations/implications -The model reached a good level of accuracy validated by suitable experiments. Nevertheless, next work in the field will also have to respect history of the heating before cooling itself (the austenitizing temperature is a function of the velocity of heating). Very important is also appropriate meshing of the investigated region to suppress numerical instabilities appearing during the computation process. Finally, acceleration of numerical schemes is a must, because modelling of one common task (on very fast PCs) takes about 4 h. Practical implications -The results and conclusions may be used for designing devices for continual induction hardening of axisymmetric bodies. Originality/value -Complete mathematical and computer model of the process, original methodology for finding the coefficient of convective heat transfer from the cooled part of the heated workpiece to ambient water spray.

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“…The problem is, moreover, nonlinear (the relative magnetic permeability is a function of magnetic field and temperature) and nonstationary, and the value of the austenitization temperature may depend on the history of heating. Papers that are aimed at the simulation of the process are relatively rare [4,1,3,6]. Despite a lot of work in the domain, the methodology still suffers from various simplifications enforced by lack of experimental data and capabilities of available software.…”

Section: Introductionmentioning

confidence: 99%