Introduction; Intended Use; Principle Of Operation - simatherm IH 070 Manual De Instrucciones

1

Introduction

The simatec IH 070/090 induction heater is designed to heat bearings that
are mounted with an interference fit onto a shaft. The heat causes the bear-
ing to expand, which eliminates the need to use force during installation.
A 90°C (194°F) temperature difference between the bearing and shaft is
generally sufficient to enable installation. At an ambient temperature of 20°C
(68°F), the bearing must therefore be heated to 110°C (230°F).
1.1

Intended use

The IH 070/090 has been designed to heat rolling bearings. However, oth-
er metal workpieces that form a closed circuit can also be heated. Examples
of acceptable workpieces include bushings, shrink rings, pulleys, and gears.
All bearings that fit over the inductive coil and between the vertical supports
with the top yoke in place can be heated using the IH 070/090. In addition,
smaller bearings can be placed over either of the three standard yokes. See
the illustrations at the beginning of this manual for examples.
1.2

Principle of operation

The IH 070/090 generates heat by
means of a large electrical current that
is magnetically induced in the work-
piece by a coil within the heater. The
high voltage, low current electricity
flowing through the large number of
windings in the inductive coil induces
low voltage, high current electricity in
the workpiece. Because the workpiece
has the electrical characteristics of a
coil with a single, short-circuited wind-
ing, the high current generates heat
within the workpiece. Because the heat
is generated within the workpiece, all of
the heater components remain cool.
© simatec ag Induction Heater IH 070/090 23