A rolled-profile manufacturer uses approximately 4,000 litres of emulsion to lubricate and cool its rolls. Cold rolling generates extremely fine metallic wear particles, often below 10 µm, which conventional belt filters usually cannot capture. A magnetic filter previously purchased for a smaller emulsion system had delivered disappointing performance.
After reading about FRIESS magnetic filtration, a maintenance employee arranged an on-site meeting. The operators were understandably sceptical because their existing filter had performed poorly. Inspection showed that it was unnecessarily difficult and time-consuming to clean.
Dirt accumulated not only on the outer tubes but also on the magnets inside them, making disassembly, cleaning and reassembly very time-consuming.
Because the poor separation result was unusual, the magnets were measured. Their flux density was extremely low at only 1,500 gauss.
Low-cost hard ferrite magnets had been used instead of more powerful neodymium magnets. This made the filter inexpensive, but its separation performance was inadequate.
After a FRIESS FMF 420/3 fitted with magnetic rods delivering approximately 10,800 gauss was installed, emulsion cleanliness improved visibly.
High flux density of approximately 10,800 gauss.
The supplied cleaning tool removes contamination from the magnetic rods quickly and easily.
In just one week, the FRIESS FMF 420/3 removed as much contamination as the previous filter had collected in twelve months. The comparison demonstrates that actual flux density at the outside of the magnetic rods is decisive for filtration performance. High-performance neodymium magnets cost more than conventional hard ferrite magnets, but their far greater separation efficiency makes them the better choice.
When comparing magnetic filtration systems from different manufacturers, always compare the actual flux density as well as the purchase price.
