Tool Steel Waveguide Channel Micro-Machining Surface Topography Optimization
Optimizing tool steel grain homogeny and micro-milling shear kinematics yields sub-100nm Sa channel surfaces, preventing mmWave signal attenuation.
Feed per Tooth
Meaning
The linear distance a milling cutter advances during the engagement of a single cutting edge defines the primary feed variable in machining polymer mold cavities. An accurate feed per tooth prevents micro-tool fracture and ensures stable material removal.
Shearing Mechanic
Proper chip formation depends on the ratio of the tool advancement to the spindle speed. If the feed per tooth is too small, the micro-cutter rubs against the metal surface, which increases friction and heat generation. Rubbing causes rapid tool wear and degrades the precision of the cavity designed for polymer replication.
Cavity Quality
Surface finish on the molded plastic part depends directly on the surface roughness of the mold insert. Setting an optimal feed per tooth minimizes tool marks and eliminates burr formation on the mold features. Smooth cavity surfaces are required to prevent replicated micro-features from sticking during part ejection.
When the mold surface has fewer micro-imperfections, the polymer melt flows with less resistance, resulting in shorter mold-filling times and better dimensional stability of the finished plastic part.
Productivity Limit
Machining cycle times can be minimized by maximizing the feeding rate within safe limits. Tool failure is costly, so machine operators optimize this variable based on the stiffness of both the tool and the workpiece material.