MITSUBISHI MATERIALS CORPORATION
BACK


FUNCTION OF TOOL FEATURES FOR TURNING

SIDE CUTTING EDGE ANGLE (LEAD ANGLE)
Side cutting edge angle and corner angle lower impact load and effect feed force, back force, and chip thickness.
Side Cutting Edge Angle and Chip Thickness
Effectsof Side Cutting Edge Angle (Lead Angle)
  1. At the same feed rate, increasing the side cutting edge angle increases the chip contact length and decreases chip thickness. As a result, the cutting force is dispersed on a longer cutting edge and tool life is prolonged. (Refer to the chart.)
  2. Increasing the side cutting edge angle increases force a'. Thus, thin, long workpieces suffer from bending in some cases.
  3. Increasing the side cutting edge angle decreases chip control.
  4. Increasing the side cutting edge angle decreases the chip thickness and increases chip width. Thus, breaking chips is difficult.
 Side Cutting Edge and Tool Life
Receive force A.Force A is divided
When to Decrease Lead Angle
  • Finishing with small depth of cut.
  • Thin, long workpieces.
  • When the machine has poor rigidity.
When to Increase Lead Angle
  • Hard workpieces which produce high cutting temperature.
  • When roughing a large diameter workpiece.
  • When the machine has high rigidity.