NovDec_AMP_Digital

ADVANCED MATERIALS & PROCESSES •

NOVEMBER-DECEMBER 2014

HTPRO

of induction coils serves as a guide in determining potential

root cause(s) of premature coil failures.

Special applications of electromagnetic induction, including

melting of glasses and oxides, optical fiber drawing, nanoparti-

cle heating, and hyperthermia applications are also discussed.

Design principles and operation specifics of modern tran-

sistor and thyristor power supplies used for induction

heating are described using conventional and advanced cir-

cuits. An appreciable amount of material is devoted to

practical aspects, including review of transformer designs

and load-matching facets and standard and customized in-

duction equipment.

Volume 4C also contains numerous case studies that illustrate

the challenges and solutions in obtaining required thermal con-

ditions for a workpiece, as well as the subtleties of computer

modeling of induction thermal processes.

Special attention is given to describing the aspects of process

monitoring, maintenance, and water cooling, as well as safety

procedures, energy efficiency, and environmental factors in-

cluding control of electromagnetic field (EMF) exposure.

EMF is invisible and is associated with the operation of any

electrical device. Several international organizations raised

concerns related to external EMF exposure, developing

awareness regarding nonionizing radiation, and the evalua-

tion of health risks associated with EMF exposure. These or-

ganizations include:

• The World Health Organization (WHO)

• The Institute of Electrical and Electronic Engineers (IEEE)

• The U.S. Occupational Safety & Health Administration

(OSHA)

• The International Radiation Protection Association (IRPA)

Studies were conducted to evaluate direct and indirect ef-

fects of EMF exposure on health, passive and active med-

ical implants, hypersensitivity, etc., leading to the creation

of a number of international standards, guidelines, and

regulations. Being unaware of basic principles related to

electromagnetic field exposure and unfamiliar with the re-

sults of studies conducted by various professional societies

and international health organizations can result in incor-

rect assumptions. One article in this handbook aims to clar-

ify this subject by reviewing key concepts regarding

occupational exposure to electromagnetic fields encoun-

tered in industrial activities with which professionals should

be aware, measures used to evaluate these situations, and

rules and international standards applicable to a 50 Hz to 10

MHz frequency range

[3]

Summary

This reference provides practitioners, students, engineers,

and scientists with the knowledge to better understand the

various interrelated physical phenomena of induction heat-

ing and heat treating. Much of the content in the 62 articles

in this handbook has not been published before. To provide

a snapshot of the wealth of information contained in Vol 4C,

a series of brief articles highlighting some of material in dif-

ferent chapters are now being published in subsequent is-

sues of

HTPro

. The review articles are authored by Valery

Rudnev (Professor Induction), who together with George

Totten served as co-editors of the handbook.

HTPRO

References

1. G. Doyon, V. Rudnev, and J. Maher, Induction Hardening of

Crankshafts and Camshafts,

Induction Heating and Heat Treat-

ing

, Vol 4C,

ASMHandbook

, V. Rudnev and G. Totten (Editors),

ASM International, 2014.

2. B.L. Ferguson and Z. Li, Modeling and Simulation of Stresses

and Distortion,

Induction Heating and Heat Treating

, Vol 4C,

ASM Handbook

, V. Rudnev and G. Totten (Editors), ASM In-

ternational, 2014.

3. L. Koenig, Control of Professional Magnetic Field Exposure –

International Standards and Regulations,

Induction Heating and

Heat Treating

, Vol 4C,

ASM Handbook

, V. Rudnev and G. Tot-

ten (Editors), ASM International, 2014.

For more information:

Dr. Valery Rudnev, FASM, is Director,

Science and Technology, Inductoheat Inc., an Inductotherm

Group Co., 32251 N. Avis Dr., Madison Heights, MI 48071,

248.629.5055,

rudnev@inductoheat.com

;

inductoheat.com

Fig. 3 —

Nodal locations on oil-hole edge

of crankshaft bearing section.

Fig. 4 —

Maximum principal stress at

node locations in Fig. 3 as a function of

spray quench time.

0 1 2 3 4 5 6 7 8 9 10

Spray time, s

800

700

600

500

400

300

200

100

Maximum principal stress, MPa

Node 4320, no delay

Node 4344, no delay

Node 4320, 2 s delay

Node 4344, 2 s delay