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Demagnetizing

List-Magnetik offers individual solutions for demagnetization and portable devices

Demagnetizers

A demagnetizing or degaussing device reduces the residual magnetism / remanence down to a value close to zero. They are used to demagnetize all types of machine parts, tools, cutting plates and bulk goods.

Excursus: How does magnetization work?

Magnetizable substances consist of tiny areas that behave like small magnets, so-called elementary magnets. If these elementary magnets are disordered, their effect outside of the body is canceled out. The whole body is then no longer a “magnet”; it is non-magnetic. However, if the majority of the elementary magnets are aligned in the same way, the body acts as a magnet. Strong external magnetic fields are required to align the elementary magnets.

Magentisierung/Entmagnetisierung

Then, what means demagnetizing?

If objects are unintentionally magnetic, they can or must be demagnetized. With a coil that changes its polarity, the elementary particles become “confused” and lose their uniform alignment. In the end, the magnetism is below the measurable threshold.

Simple demagnetizers and their limits

Mobile demagnetizers are good for small parts or if you have enough time. With a coil that oscillates at 50 Hz in the cycle of our usual alternating voltage, objects with low magnetic properties and small dimensions, especially with little depth, can be demagnetized well. The penetration depth of a mobile demagnetizer is a few centimeters. If necessary, the process must be repeated several times and carried out from different sides.

Flow production or large objects

If mobile demagnetization devices are not sufficient because the cycle time is too short or the object is too long, other techniques have to be used.

Similar to magnetization, strong impulses through capacitor discharge in a tunnel-shaped coil help to create a decaying field. The first impulse is so strong that the object has to be held on the ground if it is not heavy enough.

Portable or stationary demagnetization systems

Whether portable or stationary systems are used depends on the size and number of parts to be processed. Let us know your needs, we can help. The demagnetization of steel parts is a complex topic and, in many cases, can only be solved with precisely adapted methods.

Simple demagnetization system

Simple demagnetization system

Project example: Development of a simple demagnetization system

This simple demagnetization system is equipped with two mobile HE-20 demagnetization devices, a conveyor belt, sensors and a height adjustment. This resulted in an individually manufactured overall package of electrics and mechanics from a single source.

Demagnetization with oscillation discharge

Demagnetization with oscillation discharge

Project example: Development of a demagnetization system for demagnetization with oscillation discharge

This demagnetization system was designed for large requirements and large workpieces. The result was a powerful demagnetization system with vibration pulse discharge technology, which is equipped with integration into the production line and conveyor belt.