The highest machining accuracy that can be achieved by turning, milling, planing, grinding, drilling and boring is as following. The editor summed it up and come with the editor to increase knowledge.
The turning accuracy is generally IT8-IT7, and the surface roughness is 1.6-0.8μm.
1) Rough turning strives to use a large depth of cut and a large feed to improve turning efficiency without reducing the cutting speed, but the machining accuracy can only reach IT11, and the surface roughness is Rα20-10μm.
2) Semi-finishing and finishing should use high-speed and small feed and cutting depth as much as possible, the machining accuracy can reach IT10-IT7, and the surface roughness is Rα10-0.16μm.
Milling is a highly efficient machining method in which a rotating multi-blade tool is used to cut a workpiece. It is suitable for processing planes, grooves, various forming surfaces (such as splines, gears and threads) and special shapes of molds. According to the same or opposite direction of the main movement speed and workpiece feed direction during milling, it is divided into down milling and up milling.
The machining accuracy of milling can generally reach IT8~IT7, and the surface roughness is 6.3~1.6μm.
1) The machining accuracy during rough milling is IT11~IT13, and the surface roughness is 5~20μm.
2) The machining accuracy of semi-finish milling is IT8~IT11, and the surface roughness is 2.5~10μm.
Planing is a cutting method in which a planer is used to make a horizontal relative linear reciprocating motion on the workpiece, which is mainly used for the shape processing of parts.
Grinding refers to the processing method of using abrasives and abrasive tools to remove excess material on the workpiece. It belongs to finishing and is widely used in the machinery manufacturing industry.
Drilling is a basic method of hole making. Drilling is often carried out on drilling machines and lathes, and can also be carried out on boring machines or milling machines.
Boring is an inner-diameter cutting process in which a tool is used to enlarge a hole or other circular profile. Its applications generally range from semi-roughing to finishing.
The tool used is usually a single-edged boring tool (called a boring bar).
1) The boring accuracy of steel materials can generally reach IT9~IT7, and the surface roughness is 2.5~0.16μm.
2) The machining accuracy of precision boring can reach IT7~IT6, and the surface roughness is 0.63~0.08μm.