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Not only the base material of tools, but also various things have a relationship between "hardness" and "toughness".
The harder it is, the less likely it is to wear out, but it is easier to chipping .
The tougher it is, the more difficult it is to chipping , but the easier it is to wear.
Indication of membrane hardness
HV ・・・ Vickers hardness.
GPa: Hardness by nanoindentation method.
Hardness measurement of films suitable for thin coating thickness is possible.
"Hardness" and "toughness" are opposite qualities, and there is no "one substance" that combines both. However, the tools required for high-efficiency machining these days are required to be "hard and sticky ( chipping difficult)". In order to achieve both of these goals, a method of applying a "hardness coating" to "tough base material " has been developed.
And the coating itself is no exception: the harder it is, the more brittle and chipping it is. In recent coatings, specifications have been developed that "the harder the better" rather than "the harder the better" but "can maintain performance even if it is chipping ". The specification that "performance can be maintained even in chipping " is a "composite multilayer coating" in which different coatings are layered on top of each other.
In particular, it is an effective specification for "thermal cracks", which are cracks in coatings due to severe temperature changes when using coolant. The latest coatings have even more value-added specifications.
~Caution~
Here, I want you to know that coating is not a nice-to-have. Depending on the nature of the process, the coating can have a negative effect. As an example, an additional Tin coating was applied to a non-coated tap for general use, and when it was processed, the volume of tap chips increased, causing chips to bite.
☆ When designing tools, from "cutting" to "discharging chips"
It has been considered.
The tools sold as products have specifications devised for their processing. The same can be said for drills and end mills (e.g., taps with coatings are designed to make chips compact).
* In other words, to select a tool, including a coating,
It is essential to check the processing contents!
Summary of < coatings and tool selection>
After confirming the processing contents, we recommend that you select from the method of selecting from a specific workpiece material such as stainless steel or titanium alloy, or from the corresponding workpiece materials described in the catalog. In addition, OSG offers a highly versatile tool series "A brand" products that perform excellent functions in a wide variety of materials and machining conditions. Please consider it as well.
OSG provides information that is useful for daily operations in a variety of ways.
・ e-learning school (web learning materials)
OSG's e-learning school allows students to acquire basic knowledge and practical skills of tools via the Internet. You can easily learn at your own pace as if you were taking a seminar in front of you while sitting in front of your computer. Please use it for training new employees and improving their skills.
・Technical seminar (paid course)
From beginners to veterans, this is a technical seminar where students learn the knowledge and skills of cutting tools in courses by level and field. We offer an effective curriculum that includes factory tours, demonstrations, and practical training.