Introduction; Intended Use; Principle Of Operation - SKF TIH L 33/MB Bedienungsanleitung

1. Introduction

The SKF TIH L MB induction heaters are designed to heat work pieces others than bearings
such as gears, couplings, bushings, pulleys, etc. The heat causes the workpiece to expand,
which eliminates the need to use force during installation. A 90 °C (162 °F) temperature
difference between the workpiece and shaft is generally suficient to enable installation. At
an ambient temperature of 20 °C (68 °F), the workpiece must therefore be heated to 110
°C (230 °F).

1.1 Intended use

The TIH L MB has been designed to heat metal workpieces that form a closed circuit.
Examples of acceptable workpieces include housings, bushings, shrink rings, pulleys, and
gears. All workpieces that it over the yoke and between the induction coils can be heated
using the TIH L MB. In addition, other workpiece can also be placed over the outermost
induction coil. See the illustrations at the beginning of this manual for examples.

1.2 Principle of operation

The principle of operation of the TIH L MB can be compared to a transformer.
The high voltage, low electrical current lowing through a large number of windings in the
TIH L MB's induction coils induces low voltage, high current electricity in the workpiece.
Because the workpiece has the electrical characteristics of a coil with a single, short-
circuited winding, the high current generates heat within the workpiece. Because the heat
is generated within the workpiece, all of the heater components remain cool.
6 SKF TIH L MB