Compression molding is a cost-effective and simple technique, but it has several limitations that affect its efficiency and applicability in various manufacturing scenarios.
What are the limitations of compression molding? 5 Key Points to Consider
1. Dimensional Precision and Surface Finish
Compression molding often results in products with less precise dimensions and rougher surface finishes compared to other methods like metal die compaction.
This is primarily due to the absence of exactly dimensioned reference surfaces.
Additional post-processing is often necessary to achieve the desired shape and finish.
2. Production Rates
The process of encapsulation and extraction of parts in compression molding is relatively laborious.
This leads to lower production rates.
The time needed to increase and decrease pressure during the process further reduces efficiency.
This makes it less suitable for high-volume production.
3. Tool Life and Material Limitations
Elastomer molds used in compression molding have a relatively short lifespan due to abrasive wear.
This is especially true when handling non-spherical powders.
Some materials are challenging to mold using compression techniques due to their high strength.
This prevents adequate deformation or interlocking of powder particles, leading to low green strength or consolidation failure.
4. Environmental and Safety Concerns
There are potential hazards associated with compression molding.
Mold leakage can lead to material loss and contamination.
In cases involving reactive fine powders like aluminum, water leakage can trigger hazardous exothermic reactions.
Regular maintenance and cleaning of the hydraulic fluid are necessary to prevent contamination.
This adds to the operational complexity and cost.
5. Process Complexity
Compression molding is a multi-stage process.
Initial powder consolidation is separate from densification.
This increases the overall process lead time compared to other near-net shape (NNS) processes where consolidation occurs in a single stage.
This complexity can be a limitation in scenarios where quick turnaround and minimal processing steps are required.
Continue exploring, consult our experts
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