Dry-bag Isostatic Pressing

Dry-bag Isostatic Pressing

At present, in rare earth permanent magnet materials, large square and cylindrical products, almost all are pre-formed by magnetic field, packaged with plastic film and then cold isostatic pressing to improve density and uniformity. Plastic film packaging, cold isostatic pressing, removing plastic seals, filling sinter boxes and other operations, multi-cut action is difficult to achieve automation, resulting in more operators, putting pressure on cost and quality management. Plastic bags with sticky oil are difficult to recycle and cause pollution.

The introduction of dry isostatic pressing is to overcome the shortcomings of the existing technology, to provide a dry bag powder molding method and equipment that requires less personnel, does not waste materials and reduces process steps.

The working principle of dry isostatic pressing is very similar to that of oil isostatic pressing, which is to transfer the force of the high-pressure liquid outside the workpiece through the soft diaphragm on the workpiece, so that all sides of the workpiece receive the same pressure, and the blank with uniform density is obtained.

The difference is that dry isostatic pressing is to fix the soft isolation film in the isostatic pressure, isolate the liquid outside, and the workpiece does not need additional packaging, directly into the isolation sleeve. The pressure rod above the high pressure chamber directly seals the high pressure chamber and pads the soft material at the part that contacts the workpiece.

Compare to traditional rubber cold isostatic pressing bags, the polyurethane CIP bags have significant advantages. As a new polymer material, polyurethane products feature smooth surface, wearing-resistant, anti-fatigue, low deformation rate. The surface of pressed products with polyurethane bags is much smoother than that pressed with rubber bags, thus it possesses better looks and less postprocessing is required. It’s an ideal tool for powder material forming by press process, which can help a company reduce cost and increase efficiency.

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