Rake Angle The rake angle is the angle between the cutting edge of the tool and a perpendicular line to the workpiece. It affects cutting forces, chip formation, and tool life.
Effect on cutting process
- Has a direct impact on: ▪ Yielding angle of the chip and plastic strain ▪ Max Temperature and temperature distribution on the rake face. ▪ Strength/Toughness of the cutting edge - Positive/Negative Rake Angle
Positive rake angles: These angles reduce the cutting forces on the spindle and work holding, making it easier to shear the material. This leads to reduced power consumption, lower heat generation, and improved tool life. Positive rake angles are suitable for materials like
aluminum, brass, and plastics. Negative rake angles:
These angles increase the cutting forces on the spindle and work holding, providing a stronger cutting edge and improved edge retention. However, they require more power to cut and can generate more heat. Negative rake angles are typically used for hard materials like cast iron, hardened steels, and stainless steel.
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