3. PCBN tool design and application examples
In the finishing of mold parts, PCBN tools perform exceptionally well in terms of machining efficiency, machining accuracy and tool life. There are two types of commercially available ball end mill cutting edges, one is a cutting edge with an axial rake angle and a radial rake angle of 0°, and a negative chamfering of the tip portion; the other is unique. The negative chamfered shape cutting edge. 
The cutting edge of the cutting edge of the PCBN tool with high CBN content is chamfered, and the edge portion is passivated into an R arc shape, which is an important measure to solve the chipping during cutting. In the case of face milling, the negative rake angle, centerless cutting edge ball end mill for ultra-high speed milling can improve the surface roughness compared to ball end mills with a central cutting edge. Therefore, when designing the cutting edge of a PCBN tool, it is necessary to use a tool shape that can fully utilize the material characteristics of the tool. When milling high-toughness special cast iron, even PCBN tools with lower CBN content have much longer life than coated carbide ball end mills, and the wear-resistant PCBN tools remain the highest. The precision of the machined surface.
In the fine-shape, sub-micron ultra-precision machining, the management of tool life is one of the important key technologies, requiring the use of tools with high life characteristics. It can be asserted that in this field of processing, it is not the most suitable tool for PCBN tools.
The machine tool that can perform high-hardness steel micro-machining is a machining center with ultra-high-speed precision cutting function. It has a new spindle structure different from the original machining center. For example, two linear motors are arranged on the drive shaft. Sensitive, vibration-free cutting feed action; the spindle uses an air turbine/hydrostatic bearing that minimizes thermal effects and can carry spindles with rotational speeds up to 120,000 revolutions per minute.
The results of high-speed milling of high-hardness steel with a binderless PCBN tool show that the tool is used in the best machining conditions (cutting edge shape, cutting conditions, tool clamping method, etc.) compared with the PCBN tool with bonding agent. Shows superior tool life characteristics. 
4. More and more attention to PCBN tool technology
In the field of machining, high-speed milling technology has achieved high added value, and technological advances aimed at higher targets are continuing. PCBN tools have evolved from being suitable for special machining to one of the mainstream tools. However, as mentioned above, it must be clearly realized that there are still many problems that need to be overcome in terms of technology. In order to truly arrive in the era of PCBN tools, it is necessary to solve the existing technical problems as early as possible.
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