Why Choose Carbide Over Cermet Inserts for Finishing Operations

When it comes to finishing operations in metalworking, the choice of inserts plays a crucial role in determining the quality and efficiency of the process. Among the various types of inserts available, carbide and cermet inserts are two of the most popular options. However, carbide inserts often outshine cermet inserts in several aspects. In this article, we will explore why carbide inserts are a preferable choice over cermet inserts for finishing operations.

High Wear Resistance

Carbide inserts are made from a TCMT insert combination of tungsten carbide and cobalt. This composition results in an insert with exceptional wear resistance. Finishing operations often involve cutting hard materials such as steel, and carbide inserts can withstand the abrasive nature of these materials without wearing down quickly. In contrast, cermet inserts, which are made from a combination of ceramics and metals, may not offer the same level of wear resistance and can lead to faster insert failure.

Excellent Heat Resistance

During finishing operations, the cutting tool experiences high temperatures due to friction between the insert and the workpiece. Carbide inserts can maintain their integrity at temperatures up milling inserts for aluminum to 1,400°C (2,552°F), ensuring optimal performance throughout the operation. Cermet inserts, on the other hand, may lose their hardness and structural integrity at higher temperatures, affecting the quality of the finishing process.

Superior Cutting Speeds

Carbide inserts allow for higher cutting speeds, which translates to increased productivity in finishing operations. The high wear resistance and heat resistance of carbide inserts enable them to maintain their sharp edges for longer periods, reducing the need for frequent tool changes. Cermet inserts may not provide the same cutting speeds due to their reduced wear resistance and heat resistance, which can slow down the production process.

Cost-Effectiveness

While cermet inserts may initially appear to be a cost-effective alternative due to their lower price point, they can actually be more expensive in the long run. The reduced wear resistance and shorter lifespan of cermet inserts often result in more frequent tool changes, leading to increased overall costs. Carbide inserts, on the other hand, provide a longer service life, resulting in lower long-term costs.

Consistency in Surface Finish

The precision and durability of carbide inserts contribute to a consistent surface finish in finishing operations. This is especially important in industries that require tight tolerances and high-quality finishes, such as aerospace, automotive, and medical manufacturing. Cermet inserts may not offer the same level of precision and consistency, leading to potential quality issues.

In conclusion, carbide inserts are the superior choice over cermet inserts for finishing operations. Their high wear resistance, excellent heat resistance, superior cutting speeds, cost-effectiveness, and consistency in surface finish make them the ideal tool for achieving optimal results in metalworking applications.

The Cemented Carbide Blog: Cutting Inserts