Selection principle of tool rake angle
The other tool forming cutter and the angle of influence of blade shape, in order to prevent the edge distortion, anterior horn often take a smaller, even taking the gamma = 0. However, the cutting conditions of these tools is not good, should be under the premise of ensuring the cutting edge forming precision, try to increase the anterior horn, such as increasing the front angle of thread lathe tool and gear hob.
Rough machining, especially intermittent cutting, under impact load, or of casting and Forging rough cutting with hard crust, with sufficient strength to ensure the knife should be properly reduced in anterior horn; but after taking some measures to strengthen the cutting edge and the edge, can also increase the value of anterior horn to reasonable.
When processing the plastic material, especially the cold work hardening serious material, should take the big front angle; when processing the brittle material, can take the smaller front angle
The strength and hardness of workpiece material is low, can take a larger even large angle; the workpiece material strength, high hardness, anterior horn shall be smaller; the workpiece is especially hard (such as hardened steel), the angle is very small or even negative.
Tool material with large bending strength, good toughness, should choose higher rake angles, such as high-speed steel tool than carbide tool, allowing the use of larger anterior angle (about 5 - 10 degrees increase).
