Magnetics Business & Technology - May/June 2024 - 25

PRODUCT NEWS
leads to the transfer of residual magnetism. Aids such as magnetic
dial gauges stand to leave strong magnetic imprints on the
tool surfaces.
How is residual magnetism detected in tools?
Experience from the field shows that residual magnetism measuring
devices as such teslameters and gaussmeters are rather
rarely used in toolmaking. Without these magnetic field measuring
devices, paper clips are used to determine any magnetic
adhesion to the tool. As an example, a paper clip will not adhere
until there is a residual magnetism between 20 and 30 Gauss. In
many cases, the residual magnetism can only be determined by
chance without a measuring device, also because other effects
may cause an adhesion effect (e.g. adhesion due
to oil film). The detection of residual magnetism
without a measuring device is particularly difficult
in deep holes with small diameters. Suitable
residual magnetism measuring devices in the field
of toolmaking are transverse Hall probe measuring
devices with fine, thin measuring tips, so that accurate
measurements can be taken in holes, outlines,
and gaps.
Which devices are used for demagnetizing?
In most cases, simple demagnetizing devices such
as plate demagnetizers or hand demagnetizers are
available in the toolmaking departments. These can
be used to effectively demagnetize small parts with
wall thicknesses of up to approx. 10 mm. However,
larger parts with material thickness significantly
greater than 20 mm or very hard tool steels (carbides)
can no longer be effectively demagnetized
with these devices. Contours, bores, and scrap
holes of larger tool plates with a material thickness
of several centimeters can no longer be effectively
demagnetized with plate or hand demagnetizers
for technical reasons. The effective magnetic field
depth in the material is simply too small with these
devices. It is not uncommon for incorrect operation
of these devices to magnetize the parts rather than
reduce the magnetism. This happens especially
when the switch-on button is turned off too early and
the device is still on the component or in the vicinity.
Most of the time, people are certainly not aware
of the limited magnetic field depth effect of these
devices and the final consequences.
Cestriom offers solutions for effective demagnetization
Cestriom
is offering equipment to demagnetize tools
and ferromagnetic parts for the US industry. Cestriom
offers SSM industrial demagnetizers, MGFE
portable demagnetizers, custom demagnetizers, DS
tunnel demagnetizers, and stray field demagnetizers.
In addition, Cestriom offers LM power modules
for SSM industrial demagnetizers, DS tunnel
demagnetizers, and stray field demagnetizers.
" Cestriom SSM industrial demagnetizers are
equipped with powerful coils and optimally adapted
LM power modules. The digitally controlled power
modules precisely guide the demagnetization
www.MagneticsMag.com
process. This approach enables efficient
solutions for demanding applications. In
high-field applications, the demagnetizer
machines are usually set for the pulse
method. In continuous or endless material
flow applications, the machines are
configured for a continuous demagnetization
process " .
Continued on page 26...
Marek Rohner,
Cestriom Founder
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May/June 2024 * Magnetics Business & Technology 25
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Magnetics Business & Technology - May/June 2024

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