What Is a Milling Inserts？
CNC milling insert is a replaceable cutting tool tip used on CNC milling cutters (like face mills, end mills, and other indexable milling tools).
Structure
Material: Usually made of carbide, cermet, CBN (cubic boron nitride), or PCD (polycrystalline diamond), depending on the work piece material.
Shape: Comes in various geometries—square, round, triangular, rhombic, octagonal, etc.
Coating: Often coated with TiN, TiCN, Al₂O₃, TiAlN, etc., to increase hardness, reduce friction, and improve heat resistance.
Function
Mounted onto a milling cutter body using screws or clamps.
Each insert has multiple cutting edges. When one edge wears out, the insert can be rotated (indexed) to a fresh edge.
Designed to handle different milling operations like face milling, shoulder milling, slotting, profiling, and contouring.
Advantages
Cost-effective: Only inserts are replaced, not the whole cutter.
Efficiency: Multiple edges per insert reduce downtime.
Versatility: Different inserts can be chosen for different materials (steel, stainless steel, cast iron, aluminum, etc.) and cutting conditions.
High precision: Maintains consistent cutting geometry.
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