Kyocera - Каталог фрезерование 2017 ENG

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           TROUBLESHOOTING

            Cutting Edges Figuration and Countermeasures

           Typical Cutting Edge Figuration  Observation                       Causes                                       Countermeasures

           Nose Wear                        • Deterioration of surface       • Too high Vc                     • Reduce Vc
                                              roughness and dimensional       • End of tool life                • Change to higher wear resistant grade
                                              accuracy

                                            • Burr formation                  • Too high f and Vc              • Sharper cutting performance
                                            • Cutting force increase                                            • Reduce Vc
           Notching                                                                                             • Change to higher heat resistant grade
           Crater Wear                      • Chip control deterioration      • Too high Vc
                                            • Surface finish deterioration                                     • Reduce Vc
                                                                                                                • Change to high speed type like Cermet
                                              (peeled surface)
                                                                                                                  or Al2O3 coated insert

                 Plastic                    • Workpiece dimension’s          • Too high cutting load           • Change to harder grade
                 Deformation                  change                          • Inappropriate tool grade        • Reduce f and ap

                 Crack from                 • Crack at nose
                 Wear
                                            • Surface finish’s sudden dete-  • Too high Vc                     • Reduce the pre-set tool life
                 Chipping                     rioration                                                         • Change to higher wear resistant grade

                 Crack from                 • Workpiece dimension chang-
                 Welding or                   es
                 Built-up Edge
                                            • Cutting force increase         • Too high f                      • Reduce f and ap
                 Mechanical                 • Surface roughness deteriora-   • Chattering                      • Change to more rigid toolholder
                 Fracture                                                     • Lack of insert toughness        • Change to tougher grade
                                              tion
                 Fracture from
                 Thermal Crack              • Surface finish deterioration   • Too low Vc                      • Increase Vc
                                            • Cutting force increase                                           • Improve sharp cutting performance
R
                                                                                                                  (rake angle, chamfer)
                 Flaking
                                            • Sudden cracking                 • Too high f and ap              • Change to tougher grade
  R24                                       • Unstable tool life              • Chattering                      • Enlarge chamfer
                                                                                                                • Enlarge Corner-R(r)
                                            • Cracking by heat cycle          • Too high Vc and f              • Change to more rigid toolholder
                                            • Possible in interrupted cut-
                                                                                                                • Reduce f
                                              ting and milling                                                  • Reduce Vc
                                                                                                                • Change to dry cutting
TECHNICAL

                                            • Possible in high-hardness      • Lack of insert toughness        • Change to harder grade
                                              material cutting                • Lack of toolholder’s rigidity    (TiC-base ceramic to CBN.)

                                            • Possible in machining with                                       • Change to more rigid toolholder
                                              chattering                                                        • Change edge preparation

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