CBN Mounted Points – Fuel Injector Components

Injectors in combustion engines deliver fuel into the combustion chamber under high pressure. As engines are downsized, injectors today must withstand very high pressures and operate with precision.

Common manufacturing methods for injector components are seat and bore grinding. The challenge with these grinding applications is the very small tool dimensions, which must nonetheless enable high-precision, economical grinding.

Product program

• Application: Injector grinding – internal and functional surfaces
• Product types: CBN mounted points for internal cylindrical grinding, profiled CBN grinding tools for needle seats and sealing faces, customer-specific tool design for micro and precision applications
• Bond: VEWN – EHWA ceramic bond
• Grit sizes: B76 – B151 (process-dependent)
• Dimensions: custom diameters and lengths for precise internal and profile grinding
• Applications: internal bores of injector bodies, needle seats, and sealing faces

Process and benefits

• Stable grinding behavior – consistent cutting performance even at very small tool diameters and long machining times
• High dimensional and form accuracy – reproducible roundness and contour accuracy at needle seats and functional surfaces
• Thermally safe process – minimized risk of surface-layer damage and microstructural changes in the injector material
• Controllable dressing behavior – consistent tool topography and constant surface quality over the tool life
• High process economy – fewer tool changes, stable cycle times, and low variation in series production

Application example

VEWN | EHWA ceramic bond – internal and profile grinding of fuel injectors (needle seats / internal bores).

Grinding tool life increased by up to 30 % compared to the previous solution. Figures from an approved customer process – the design is always engineered around the machine, workpiece, and process of the individual case.