![\"Vimfun](\"https:\/\/www.endlesswiresaw.com\/wp-content\/uploads\/2025\/12\/Magnet-machining-NvFeB2-1024x576.webp\" "\\"\u0411\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u0430\u044f")
<\/figure>\n\n\n\nWhy Does Coolant Matter During Magnet Cutting?<\/h2>\n\n\n\n
Coolant in diamond wire cutting serves four functions, and the priority ranking shifts depending on the material:<\/p>\n\n\n\n
\u0421\u043c\u0430\u0437\u043a\u0430.<\/strong> The diamond grits on the wire create friction against the workpiece. Coolant reduces this friction, which lowers cutting force, extends wire life, and improves surface finish. Oil-based coolants have inherently better lubricity than water \u2014 the viscosity keeps a thin film between wire and workpiece even under load.<\/p>\n\n\n\n Heat dissipation.<\/strong> Diamond wire cutting generates less heat than grinding or blade cutting, but it\u2019s not zero. Localized temperature at each grit contact point can reach 100\u2013200 \u00b0C momentarily. Coolant absorbs and carries away this heat. Water has roughly 2\u00d7 the specific heat capacity of mineral oil (4.18 vs ~2.0 J\/g\u00b7K<\/a>), so it\u2019s objectively better at cooling. For most magnet cutting, this advantage is academic \u2014 the heat generation is low enough that either type works. But on thick cross-sections (above 40 mm) at higher feed rates, water-based coolant keeps the cutting zone noticeably cooler.<\/p>\n\n\n\n Chip evacuation.<\/strong> The wire drags coolant through the cutting kerf, flushing out swarf particles. If swarf accumulates in the kerf, the loose particles get re-cut by the wire, scratching the cut surface and accelerating wire wear. Lower-viscosity coolants (water-based) flush more effectively through narrow kerfs. Higher-viscosity coolants (oil-based) carry particles better once they\u2019re entrained but penetrate narrow kerfs less readily.<\/p>\n\n\n\n Surface protection.<\/strong> This is where the material chemistry takes over. On reactive materials like NdFeB, the coolant must prevent oxidation of the freshly exposed surface during cutting. On chemically stable materials like ferrite and SmCo, this function is irrelevant. This single factor \u2014 surface protection \u2014 is why coolant selection is material-dependent rather than universal.<\/p>\n\n\n\n \u0412\u043e\u0442 \u043c\u0430\u0442\u0440\u0438\u0446\u0430 \u0440\u0435\u0448\u0435\u043d\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u0432 \u043d\u0430\u0448\u0435\u0439 \u043b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f:<\/p>\n\n\n\nWhich Magnet Cutting Coolant for Which Material?<\/h2>\n\n\n\n
![\"\u041f\u043b\u0435\u0435\u0440](\"https:\/\/i.ytimg.com\/vi\/Ousj1N04KxM\/maxresdefault.jpg\" "\\"\u0411\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u0430\u044f")