HRC65 Thread Mill Tool Life: Key Factors Affecting Wear and Durability
A North American client specializing in injection mold inserts sent us PM-HSS workpieces heat-treated to HRC 63–65. While milling M6×1.0 internal threads on a horizontal machining center, they tested three different cutters marketed for hardened steels. None could reliably finish even four holes: the tips chipped on entry, or flank wear spiked so fast that
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