MITSUBISHI MATERIALS CORPORATION
BACK

FUNCTION OF TOOL FEATURES FOR TURNING

SIDE CUTTING EDGE ANGLE (LEAD ANGLE)
The side cutting edge angle reduces impact load and affects the amount of feed force, back force and chip thickness.
Side Cutting Edge Angle and Chip Thickness
Effects of 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

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 workpiece with large diameter.
  • When the machine has high rigidity.
Receive force A. / Force A is divided into a and a'.

TOP
BACK