Tham khảo tài liệu 'turning and chip-breaking technology part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Turning and Chip-breaking Technology 43 entering angle of 45 and lead angle of 45 is utilised giving rise to equal axial and radial component forces. In case II the entering angle has changed to 75 and lead angle is now 15 these altered angles change the component forces with an increase in the axial force while reducing the radial force. In case III an orthogonal cutting action occurs with only a 90 entering angle . the lead angle reduces to zero showing a large increase in the axial force component at the expense of the radial force component which is now zero10. In case IV an oblique cutting action has returned . as in cases I and II but here the entering angle has changed to -15 with the lead angle 75 this produces a large axial component force but the radial component force direction has now reversed. This last tool plan approach angle geometry . case IV is similar to the geometry of a light turning and facing tool allowing cylindrical and facing operations to be usefully undertaken - but the tool s point is somewhat weaker that the others with the tool points becoming of increased strength from right to left. Therefore in case I for a given feedrate and constant DOC the cut length area is greater than the other cases shown and with this geometry it enables the tool to be employed for heavy roughing cuts. Returning to case III if this tool is utilised for finish turning brittle-based workpiece materials then upon approaching the exit from a cut if the diameter is not supported by a larger shoulder diameter then the axial component force pressure will be likely to cause edge break-out . sometimes termed edge frittering below the machined surface diameter at this corner . potentially scrapping the machined part . In mitigation for this orthogonal cutting tool geometry if longer slender workpieces require cylindrical turning along their length then with the radial force component equating to zero it does not create significant push-off and allows .
