Isostatic pressing is a method used to apply uniform pressure to a powder to create dense, strong parts.
There are two main types of isostatic pressing: wet bag and dry bag.
Understanding the difference between these two methods can help you choose the right one for your needs.
5 Key Points to Understand the Difference Between Wet Bag and Dry Bag Isostatic Pressing
1. Method of Containing the Powder
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.
2. Suitability for Different Production Scales
Wet bag isostatic pressing 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.
3. Common Applications
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.
4. Productivity and Automation
However, the loading and unloading of molds can limit productivity and automation in wet bag isostatic pressing.
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.
5. Tooling Cost and Complexity
However, the tooling cost and complexity of the process are generally higher compared to uniaxial pressing.
Continue exploring, consult our experts
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