Compression molding is a popular manufacturing process, but it does come with its own set of challenges.
What are the 8 Disadvantages of Compression Molding?
1. Excess Material Trimming
After compression, excess raw material needs to be manually trimmed off. This increases production time and labor costs. It also prevents the technology from being fully automated.
2. Size Limitations
The obtained target size is limited due to the limitation of the hot pressing equipment and the size of the mold. The current maximum size of the target is typically around 400 × 300mm.
3. High Requirements on Mold Materials
Compression molding requires high-purity, high-strength graphite molds. These can be expensive and not suitable for industrial continuous production.
4. Low Production Efficiency and High Cost
The production efficiency of compression molding is generally lower compared to other molding techniques. Additionally, the cost of importing hot pressing equipment and the requirement for high-quality molds contribute to higher production costs.
5. Poor Uniformity of Target Grain
The uniformity of the target grain in compression molding can be poor. This may affect the quality and consistency of the final products.
6. Size Limitations in Powder Metallurgy
In powder metallurgy, there are size limitations to the parts that can be produced. Typically, these are limited to about 40-50 sq. in. of planar area. This may restrict certain designs or require additional considerations in part development.
7. Challenges with Complex-Shaped Parts
Complex-shaped parts can be challenging to produce using compression molding. Although skilled manufacturers can often overcome this challenge and provide assistance with design.
8. Lower Strength and Ductility Compared to Cast Irons or Forged Parts
Parts produced through compression molding are generally not as strong or as ductile as those made through casting or forging processes.
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