Journals Information
Manufacturing Science and Technology(CEASE PUBLICATION) Vol. 3(4), pp. 128 - 133
DOI: 10.13189/mst.2015.030409
Reprint (PDF) (743Kb)
Power Control for Stable Achievement of Local Hardening of Steel Using Rapid Resistance Heating
Seijiro Maki 1,*, Yuuki Makida 2, Eitoku Nakanishi 1
1 Division of Mechanical Engineering, Graduate School of Engineering, Mie University, Japan
2 Mie University, Japan
ABSTRACT
The method of local hardening of steel using rapid resistance heating was devised by focusing attention on one of the unique characteristics of the resistance heating that the heat generated by Joule heating per unit volume at the area in contact with electrodes is directly proportional to the square of current density and inversely proportional to the contact area ratio. This characteristic enables heating of steel for austenitizing essential to hardening even at the area in contact with the electrode of high thermal conductivity. In this study, effective measures for power control were considered to ensure stable achievement of local hardening in the case that there is an impedance change due to change of the treating objects or the treating positions in just the same object. A measure conclusively suggested as a strongly possible one was input heat control based on the integrated value of square of flowing current with respect to time, relating to the resistance heating characteristic in the present case. Effectiveness of the control was confirmed by experiments with an alternating current power supply to which the function described above was added.
KEYWORDS
Heat Treatment, Hardening, Local Hardening, Resistance Heating, Power Control
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Seijiro Maki , Yuuki Makida , Eitoku Nakanishi , "Power Control for Stable Achievement of Local Hardening of Steel Using Rapid Resistance Heating," Manufacturing Science and Technology(CEASE PUBLICATION), Vol. 3, No. 4, pp. 128 - 133, 2015. DOI: 10.13189/mst.2015.030409.
(b). APA Format:
Seijiro Maki , Yuuki Makida , Eitoku Nakanishi (2015). Power Control for Stable Achievement of Local Hardening of Steel Using Rapid Resistance Heating. Manufacturing Science and Technology(CEASE PUBLICATION), 3(4), 128 - 133. DOI: 10.13189/mst.2015.030409.