New shape of the tool surface <br> <br> Today, the coating thickness is generally in the micron size range, the coating process is basically really show the original surface topography of the tool. That is to say, after coating, the surface of an otherwise rough tool is still rough. But if you look through the microscope, the situation will be different. Some special coating processes produce a smooth coating surface that is virtually flawless, while other processes produce only a rougher surface with particles (droplets). For many applications, this roughness is not critical. However, in deep hole drilling, the rough coating is problematic because the chip flow is critical. There are only two solutions: one is to select a "smooth" coating; the other is to provide a composite coating with a lubricating layer for the tool.

In-depth understanding of the coating

Another factor that cannot be underestimated is the thickness of the coating. Typically, the coating thickness is a few microns. However, in specific applications, in order to get the best performance of the tool, it is sometimes necessary to apply an ultra-thick or ultra-thin coating to the tool. For example, an ultra-thick coating is more resistant to pure abrasion, while an ultra-thin coating is more resistant to alternating loads when stressed. A few years ago, the typical gold-titanium coating was a simple structure with a single composition. No one talks about composite coatings, nano-coating or ladder-like coatings. The situation has become more complicated today. Targeted control during the coating process will result in changes in the coating structure and composition, which will significantly alter the performance of the coating. The most typical example is the multi-component coating of TIALCN. As long as the coating process is adjusted, it can directly affect its hardness and ductility. The residual stress of the coating plays a crucial role. In other words, even the same coating composition can achieve different coating qualities.

Today's coating or tool manufacturers must have the ability to adjust the internal structure of the coating to achieve optimal application efficiency.

As is common in the industry, versatile coatings, in fact, have been discounted in coating design in order to achieve efficiencies in a wide range of applications. However, such coatings can only be an alternative for a particular field. Only those coatings that are specifically tailored to the specific needs of the tool and application conditions will achieve a substantially specific application effect. Today, we can't expect to get the best performance results by simply copying the coated products printed on the product samples to the actual application. Coatings have been considered as an integral part of the tool, just as the geometry and base material should be tailored to the specific application conditions and optimized. Due to the complexity and versatility of modern coating material design, in order to truly enable end users to fully obtain 100% of their value, they must rely on the technical knowledge of both tool manufacturers and coating experts.

To be sure, the versatile standard coating has its foothold for processing applications in the future. However, in modern high-performance production, only tools with optimized coatings can enhance the competitiveness of the company in the market.

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