The fifth process of magnet production: isostatic pressure

Molding field oriented link to neutralize the green density of about 3.2 3.8 g/cm after, and the ideal of sintered ndfeb magnet density should be 7.5 g/cm after the left and right sides, when pressing larger cylindrical and square so easily because of its high shrinkage crack, lack of Angle deformation and out-of-tolerance size, so still need to put into the isostatic press by isostatic pressing to increase the density of green, after isostatic pressing of the green density of 4.5 g/cm after, magnet manufacturer at present in addition to the low performance of small pillars (Ф 10 mm) under static pressure placed directly outside the box last in sintering furnace are through static links such as other specifications,In order to prevent oil immersion and surface oxidation, the isostatic green must be vacuumized and stripped before entering the furnace.

The working principle of the isostatic press is PASCAL's principle. It will be put into the soft mold cover of the green person in the airtight ultra-high claw container, through the booster pump to the sealed container and continuously press the hydraulic oil, so that the hydraulic pressure in the sealed container increases constantly, the general use pressure is 100~ 630MPa.By the high pressure liquid evenly ACTS on the rubber sleeve surface, and compresses the granulation material inside the rubber sleeve, causes it to shape.Due to the characteristics of isostatic pressure is equal in all directions, so after forming the blank density uniform, uniform organization and structure, isotropic.

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