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Thread Turning Inserts Wear Problems and Solutions

Thread Turning


Type of Wear
    • ×
      Flank Wear
      Flank Wear
      Cause
      • High cutting speed
      • Low wear resistance carbide grade

      Remedy
      • Reduce cutting speed
      • Increase depth of cut per pass
      • Use harder coated cutting tool material
      • Increase coolant flow rate
      • If un- even wear :
        Check for the right anvil shim.
        Change infeed method
      • For work-hardening materials, select a smaller entry angle
      • Reduce the cutting speed when machining heat resistant materials
    • ×
      Plastic Deformation
      Plastic Deformation
      Cause
      • Cutting temperature is too high

      Remedy
      • Decrease depth of cut per pass
      • Increase coolant flow rate
      • Reduce cutting speed
      • Use geometry with bigger radius
      • Use a tougher carbide
    • ×
      Edge Fracture
      Edge Fracture
      Cause
      • Caused by excessive insert wear before indexing the insert
      • The grade and geometry could be too weak for the applications
      • Excessive load on the insert
      • Built-up edge has been formed on the insert

      Remedy
      • Reduce the cutting speed
      • Use a tougher cutting tool material
      • Use a stronger cutting edge
      • Check the tool stability if vibration occurs
      • Reduce the feed rate
      • Turn off coolant supply when machining interrupted cuts
      • Increase corner radius if possible
      • Reduce feed and/or depth of cut
      • Select a stronger or thicker insert and tougher grade
    • ×
      Built-up Edge
      Built-up Edge
      Cause
      • Cutting zone temperature is too low
      • Negative cutting geometry
      • Machining of very sticky materials such as low-carbon steel, stainless steels, and aluminum

      Remedy
      • Increase cutting speed
      • Use a coated carbide
      • increase coolant pressue
      • Cutting zone temperature is too low
      • Negative cutting geometry
      • Machining of very sticky materials such as low-carbon steel, stainless steels, and aluminum
    • ×
      Chipping
      Chipping
      Cause
      • Caused by either the cutting edge of the insert being too brittle, or a built-up edge has been formed

      Remedy
      • Reduce cutting speed
      • Reduce cutting depth
      • Change grade
      • Increase coolant pressue
      • Select a tougher grade
      • Increase cutting speed
      • Select a positive geometry
      • Reduce feed rate at beginning of cut
      • Improve stability of the set-up
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