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.
Radial Runout
Meaning
Geometric error in a rotating component where the distance between the axis of rotation and the outer surface varies. This measurement quantifies how much a cylinder or shaft deviates from a perfect circle relative to its rotational center. Minimizing radial runout on coating rollers is essential for maintaining a constant electrode thickness in battery production.
Dial Displacement
Technicians place a measurement probe against the circumference of the rotating part to monitor changes in the radius. The total radial runout is the difference between the highest and lowest points recorded during a full revolution. Precision instruments are used.
Thickness Control
Fluctuations in the roller surface cause the pressure or the gap in the coating process to change dynamically. When radial runout is high, they create a repeating pattern of thick and thin areas in the active material layer known as ribbing or barring. This variation affects the electrochemical performance of the cell because the energy density becomes non-uniform across the electrode.
Quality control teams use non-contact sensors to monitor these variations in real time. If the deviation exceeds five microns, the roller must be reground or replaced to prevent cell rejection.
Bearing Load
Eccentric rotation generates centrifugal forces that lead to increased vibration and premature wear of the support bearings. Because radial runout shifts the center of mass, it can cause the entire coating head to oscillate at high speeds. Stable rotation is necessary.