What Causes Thread Mill Wear in Hardened Steel? Key Factors Explained
A European client making injection molds reached out with an urgent issue. While machining M6 internal threads in 1.2379 (D2) inserts hardened to 54 HRC, their shop ruined three consecutive carbide thread mills. Operators cut spindle speeds in half, doubling cycle times. Yet every removed tool showed chipped crests or delaminated coatings, and parts consistently
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