Understanding Insert Wear Mechanisms
Insert wear is a natural phenomenon that occurs during machining operations and refers to the gradual degradation of the cutting tool’s cutting edge and surface due to friction, abrasion, and thermal effects. It is a significant factor affecting tool life, machining efficiency, and surface finish quality in metal cutting processes. Understanding the types and mechanisms of insert wear is crucial for optimizing machining operations and prolonging tool life.
5 Primary Forms of Insert Wear
Flank Wear
The most predictable form of wear occurring along the relief face due to abrasive rubbing against the workpiece. Controlled by selecting harder, wear-resistant carbide grades and lowering cutting speed (Vc).
Edge Chipping
Small fragments breaking off the cutting edge, usually caused by mechanical shock, interrupted cuts, chatter, or built-up edge flaking. Mitigated by using tougher carbide grades and stronger hone preparations.
Notch Wear
Localized wear at the depth-of-cut line, common when machining work-hardening materials like stainless steels or superalloys. Countered by varying the depth of cut and utilizing round or high-lead angle inserts.
Crater Wear
Depression forming on the rake face behind the cutting edge caused by high temperature chemical diffusion between hot chips and carbide. Addressed by lowering cutting speed and using Al2O3 CVD coatings.
Built-Up Edge (BUE)
Workpiece material pressure-welding itself onto the cutting edge at low cutting speeds. Eliminated by increasing cutting speed, using sharp positive geometries, and ensuring abundant high-pressure coolant.
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