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White
Papers
Technical cleanliness / ISO 16232/VDA19
Low-level demagnetization as preparation process for shaping of
metal powder parts
The process safe compaction of ferromagnetic powders requires low residual
magnetism on the tooling. The flow of the metal powder is already reduced
at residual magnetism over 2A/cm (2.5 Gauss). Powerful degaussing systems
allow the effective demagnetization of powder press frames, adapters and
sintered tungsten carbide punches and dies on site.
 
When clicked on, the pictures appear in their original
size
White
paper – degaussing of powder presses
Residual
magnetism on ferromagnetic workpieces
The magnetization of ferromagnetic workpieces is caused in practice from
diverse sources. Technical equipments, such as lifting magnets, crack
detection, magnetic chucks, magnetic tools, etc., are causing a magnetization
of the workpiece. Often residual magnetism on machined parts is detected
too late after difficulties encountered in the manufacturing process or
from customer complaints. Find more detailed information on residual magnetism
on ferromagnetic parts, as well as definitions and terminology in the
following white paper.
Causes
for residual magnetism in workpieces
Measurement
of residual magnetism on ferromagnetic parts
The magnetic stray fields on parts made of steel move typically between
0 and about 50 A/cm (~63 Gauss). In special cases even significantly higher
values may occur. Proper and reproducible measurement of residual magnetism
requires a basic knowledge and the use of appropriate measuring instrumentation.
In the following white paper, basic knowledge and appropriate instruments
to measure magnetism on ferromagnetic workpieces are described.
Measuring
residual magnetism on workpieces
Workplace safety and demagnetizers
Demagnetizers based on alternating field principle generate electromagnetic
fields in the low frequency range. A workplace must fulfill rules of safety
for areas where electromagnetic fields appear. Internationally, the recommendations
and guidelines of the ICNIRP define exposure limits for electromagnetic
fields. Concerning workplace safety, national norms apply, like for instance
BGV B11 in Germany. Find more information on the topic workplace safety
for operators of demagnetizers in the following white paper.
Workplace
safety for demagnetizer operators
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