Milling cutters are widely used multi-edged rotary cutters. Divided by purpose: 1) For machining planes, such as cylindrical face milling cutters, end mills, etc.; 2) For machining grooves, such as end mills, T-knifes, and angle cutters; 3) Forming the surface Used, such as convex semi-circular and concave semi-circular cutters and milling cutters for machining other complex forming surfaces.