Traditionally CBN grades operate exceptionally well, but within the restrictions of a narrow band dictated strictly by the material being machined, small depths of cut and very precise cutting parameters.
Advancements in materials, coatings and manufacturing methods have combined together with increased knowledge of edge honing styles and chipbreakers to provide a new grade with a much wider application range.
Mitsubishi’s “Particle Activated Sintering Method” creates a much stronger binding between the particles that enables the main CBN material to have a more reliable and stronger cutting edge than previous grades. This added strength enables interrupted cutting without compromising tool life for high speed continuous operations on steels up to 60HRC. In addition high crater wear resistance makes it possible to use larger depths of cut than is usually possible.
These advancements have led to the introduction of 2 new styles, a full face type for the MB4020 grade and a solid CBN with centre clamping hole for the MBS140 grade.
MB4020 full face type
An increased CBN particle content and bonding strength makes this grade ideal for machining sintered materials. An additional benefit from the increased CBN content is the reduction of welding of the work material. The new full face geometry allows for higher depths of cut and chamfering where conventional brazed tips are not suitable.
The new 100% CBN inserts allows the high speed and efficiency of finishing to be applied to roughing applications. A balance of wear and fracture resistance in conjunction with the through hole clamping permits larger depths of cut and reduces vibrations even under high cutting loads. MBS140 is suitable for a machining a wide range of materials from cast iron through to high speed steels and cemented carbide.
Source Mitsubishi Materials