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.
Edge Radius
Meaning
Curvature measurements at the intersection of the rake and flank faces determine the sharpness and durability of a rotary cutting edge. Maintaining a minute edge radius on slitting blades ensures sharp shear initiation without excessive force. Tool wear gradually increases this radius, altering the deformation mechanics from clean cutting to material tearing.
Dimensional control of blade sharpness directly influences edge burr heights on current collectors.
Cutting Force
Sharp blade margins concentrate applied mechanical loads onto narrow material zones along the shear line. A small edge radius reduces the total vertical force needed to exceed the ultimate tensile strength of current collector foils. Lower cutting forces reduce substrate distortion and web stretching during processing.
Deformation Zone
Increasing blade tip rounding widens the localized plastic deformation region within the metallic current collector. A large edge radius forces the foil material to flex and draw before fracturing, promoting severe edge burr growth. Sharp cutting profiles constrain plastic deformation strictly within the target shear lane.
Tool Selection
Choosing blade materials involves balancing initial sharpness against edge resistance to mechanical chipping. Sub-micron edge radius values achieved on ultra-fine grain tungsten carbide allow clean cutting of thin foil substrates. Optimized tool geometry minimizes maintenance frequency and maintains edge quality standards.