零件的加工特征既包括零件的形状特征，如平面、圆柱面、圆锥面、球面、孔、

Processing features of the part both shape features of parts, such as <br>flat, cylindrical, conical surfaces, spherical, holes, slots, splines, spiral <br>pattern; material characteristics, such as material type, material hardness, material of the heat <br>treatment requirements; also includes precision Features, such as shape and position accuracy, surface <br>quality; process features, such as parts clamping positioning, cutting amount. <br>The process design principles mainly include rough first and then fine, surface first and hole <br>first, benchmark first, concentration and dispersion of working procedures, etc. Different types of components and yield <br>product quality, the selection of the division processing characteristics and processes are <br>quite different.

The machining characteristics of a part include both the shape characteristics of the part, such as<br>Planes, cylindrical faces, cones, spters, holes, grooves, flower keys, screws<br>material characteristics, such as material type, material hardness, material heat<br>Processing requirements, including precision features, such as position accuracy, surface<br>Quality, process characteristics, such as part clamp positioning, cutting usage.<br>The principles of process design mainly include first coarse and then refined, first surface and then hole, benchmark<br>First, the concentration and dispersion of operations, etc. Different part types and products<br>Product quality requirements, the division of processing characteristics and the choice of processes have<br>There's a big difference.

The machining features of parts include the shape features of parts, such as<br>Plane, cylindrical surface, conical surface, spherical surface, hole, groove, spline and screw<br>Material characteristics, such as material type, material hardness, material heat<br>Processing requirements; also includes accuracy features, such as form and position accuracy, surface accuracy<br>Quality; process characteristics, such as parts clamping and positioning, cutting parameters.<br>The principle of process design is rough first and then fine, surface first and then hole, datum<br>First, the process of concentration and dispersion. Different parts types and products<br>The quality requirements of products have great influence on the division of processing characteristics and the selection of working procedures<br>There is a big difference.<br>