Page 4 - CBN_2018
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Materials for HPT Machining


       PCBN INSERTS  HPT (Hard Part Turning): PCBN and Ceramic   hardness than carbide, offer a good option for
                There are two main types of materials for
                                                                 Ceramic inserts, which have a higher level of

                                                                 HPT machining from 45 to 60 HRC.
                inserts. In order to machine materials with
                                                                 PCBN inserts are suitable for HPT machining
                high hardness level of 65 HRC, inserts with
                                                                 from 50 to 70 HRC.
                higher level of hardness than a carbide insert
                are necessary.
                                                        PCBN








                    POLYCRYSTALLINE             CUBIC             BORON              NITRIDE
















                Boron Nitride is characterized by a very high     Very good thermal conductor - heat removal
                hardness level - close to synthetic diamond.      is critical to achieve the desired outcome
                                                                  and long tool life.




                     HB       ISCAR materials on a hardness scale:                                       HRc
                              Carbide up to 45Hrc, Ceramic from 45 up to 60Hrc, PCBN from 55 up to 70Hrc

                760                                                                                          70


                                                    Hardened         Hardened         Hardened
                                                     Materials       Materials        Materials
                711                                   PCBN             PCBN            PCBN                  65



                552                                                                                          55
                                                   Hardened         Hardened        Hardened
                                                   Materials        Materials        Materials
                                                    Ceramic         Ceramic          Ceramic
                419                                                                                          45



                322                                                                                          35




                250                                                                                          25





     4      ISCAR
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