Tool Steel Selection for Precision Electrode Slitting Blades
Precision electrode slitting requires powder metallurgy tool steels with high vanadium carbide volume to eliminate micro-chipping and maintain burr limits below 10 µm.
Axial Runout
Meaning
Geometric deviation of a rotating component where the surface wobbles along the axis of rotation. This measurement identifies the degree to which a circular face departs from a plane perpendicular to the spindle axis. Controlling axial runout in electrode coating rollers ensures a uniform slurry thickness across the width of the foil.
Indicator Displacement
Metrology teams position a dial test indicator against the flat face of a rotating shaft or flange to record the total variation. The axial runout value represents the difference between the maximum and minimum readings taken over a full 360 degree rotation. Precise alignment is required.
Coating Uniformity
Fluctuations in the position of the roller face cause the gap between the applicator and the substrate to change dynamically. When axial runout exceeds specified tolerances, they create a wavy coating profile that leads to inconsistent energy density in the finished battery cell. Even small deviations produce measurable mass variations.
This instability forces frequent adjustments to the slurry feed system.
Bearing Wear
Excessive wobble places uneven loads on the support structures and lubrication films. Because the displacement occurs once per revolution, axial runout generates vibrations that accelerate the degradation of high-speed spindles. Vibration shortens machine life.