The rake angle is the angle between the front and the base of the tool and is measured in the orthogonal plane; the rear corner is the angle between the cutting edge and the cutting plane 'measured in the orthogonal plane. The front angle is too large, the tool is sharp, then the plastic deformation and frictional resistance of the cutting layer are reduced, the cutting force and the cutting heat are reduced. However, if the front angle is too large, the cutting edge strength is weakened, the heat dissipation condition is deteriorated, the tool life is reduced, Collapse knife. Increase the rear angle, is conducive to improving tool durability, but the rear angle is too large, will reduce the cutting edge strength, and heat conditions worse.

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