The difference between wet bag and dry bag isostatic pressing lies in the method of containing the powder and applying pressure.
In wet bag isostatic pressing, the powder is placed inside a forming mold (or casing) which is then sealed and submerged in a high-pressure cylinder filled with liquid. The pressure transmission medium is in direct contact with the mold. This method is suitable for experimental research and small batch production. It allows for the simultaneous pressing of multiple shapes and the production of large and complex parts. Wet bag isostatic pressing is commonly used for low-volume production of specialty parts, prototyping, and research and development. It has the advantage of being versatile and cost-effective, but the loading and unloading of molds can limit productivity and automation.
On the other hand, dry bag isostatic pressing involves the integration of the mold into the pressure vessel itself. The powder is added to the mold, which is then sealed before pressure is applied. The mold serves as a flexible membrane that isolates the pressure fluid from the powder, creating a "dry bag". This process is cleaner as the mold does not become contaminated with wet powder. Dry bag isostatic pressing is often chosen for achieving high compact densities and accessing shapes that cannot be compacted in uniaxial presses. It is particularly suitable for high-volume production and can be automated easily. However, the tooling cost and complexity of the process are generally higher compared to uniaxial pressing.
In summary, wet bag isostatic pressing involves submerging a sealed mold in a high-pressure cylinder filled with liquid, while dry bag isostatic pressing integrates the mold into the pressure vessel itself, isolating the powder from the pressure fluid. Wet bag isostatic pressing is more versatile and cost-effective for small batch production, while dry bag isostatic pressing is better suited for high-volume production and automation.
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