CBN Segments – Brake Disc Machining

The EURO 7 standard places increased demands on particulate emissions from brake systems. Alongside material selection, the targeted surface finishing of the brake disc is becoming critically important. CBN segments enable a reproducible friction ring surface with a defined topography, low thermal damage, and stable process characteristics – central requirements for reducing brake wear over the entire service life.

Product program

• Version: segmented CBN grinding and honing stones for friction ring machining
• Bond: metallic (MH) or hybrid (MP), matched to tool life and surface function
• Grit size: D181 – D54 for targeted control of functional roughness
• Geometry: customer-specific segment dimensions matched to the tool holder
• Process design: optimized for EURO 7-relevant surface parameters (Ra, Rz, Rpk)

Process and benefits

• Defined surface – reduced brake wear, stable friction coefficient
• Thermally safe process – no microstructural damage
• Segmented machining – homogeneous friction ring surface
• Reproducibility – consistent emissions performance
• High tool life – stable quality across production runs

Application example

EHWA CBN ceramic bond (vitrified CBN) – fine grinding of laser-cladded brake discs (EURO 7 coatings, e.g. HVOF / laser cladding).

Grinding wheel tool life increased by up to 25 %. Result at the customer: stable surface structure of the friction face, no coating spalling, no thermal cracks, uniform contact pattern on the brake disc.