Page 564 - Ceratizit Catalog
P. 564

Types of wear
   B237





                                                                Flank wear


                                                                Reasons
                                                                ○ Cutting speed too high
                                                                ○  Carbide grade with insufficient wear resistance
                                                                ○ Incorrect feed rate
                                                                Remedies
                                                                ○  Reduce cutting speed
                                                                ○  Select more wear resistant carbide grade
                                                                ○ Adapt feed rate to cutting speed and cutting depth
                                                                  (increase feed rate)


           Abrasion on flank, normal wear after a certain machining time.








                                                                Edge chipping

                                                                Reasons
                                                                ○ Grade with too high wear resistance
                                                                ○ Vibration
                                                                ○  Feed rate too high or excessive cutting depth
                                                                ○ Interrupted cut
                                                                ○ Swarf damage

                                                                Remedies
                                                                ○ Use tougher grade
                                                                ○  Use negative cutting edge geometry with chip groove
                                                                ○ Increase stability (tool, work piece)

           Through excessive mechanical stress at the cutting edge fracture and chipping
           can occur.







                                                                Thermal cracking

                                                                Reasons
                                                                ○  Varying temperature of cutting edge, thermal shock
                                                                ○ Incorrect cooling
                                                                ○ High tensile materials
                                                                ○  Cutting speed too high
                                                                Remedies
                                                                ○  Use grade that is resistant to thermal cracking
      Milling / Technical information  Small cracks at 90° to cutting edge.  ○  Decrease feed rate
                                                                ○ Apply cooling lubricant abundantly or use dry milling
                                                                ○ Reduce cutting speed
   559   560   561   562   563   564   565   566   567   568   569