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.
Horizontal Shear Clearance
Meaning
Lateral spacing distances between upper and lower rotary knife blades control the stress distribution and fracture initiation across a foil thickness. Adjusting horizontal shear clearance determines whether a material undergoes clean shear fracture or excessive plastic bending. Improper clearance values generate pronounced edge burrs and induce severe web distortion.
Precise lateral alignment guarantees uniform edge geometry along extended production runs.
Shear Deformation
Shear fracture occurs when opposing mechanical forces create a localized crack propagating through the foil thickness. Incorrect horizontal shear clearance shifts crack initiation points, resulting in secondary fracture surfaces and rough edge profiles. Optimum clearance ranges typically span five to ten percent of the current collector thickness.
Burr Formation
Excessively wide blade spacing allows metal foils to draw into the gap, causing extensive plastic strain prior to failure. Large horizontal shear clearance leads to heavy edge burrs that threaten battery separator integrity. Overly tight clearances cause double-shearing and rapid tool edge wear.
Alignment Control
Precision shim packs and dynamic axial adjustment mechanisms govern blade positioning inside rotary slitting cassettes. Setting horizontal shear clearance accurately across multiple cut lanes requires rigid arbor designs and precise bearings. Regular alignment checks offset thermal expansion effects during high-speed machine operation.