What Are the Machining Accuracy Grades of CNC Machining Centers?

Generally speaking, according to the classification of international precision tolerance levels, IT6 is widely used in the important coordination index of machining. IT6 indicates that the mating surface has higher uniformity requirements, which can ensure high-grade mating properties, stable and reliable use, and the machining center can complete various processes such as drilling, boring, expanding, reaming, and rigid tapping.

A. Drilling

Drilling is another important processing procedure of machining centers. Drilling is a basic method of hole machining. Drilling is often performed on drilling machines and lathes. Some high-precision requirements can also be completed by machining centers. 

The machining accuracy of drilling is low, the tolerance grade can only reach IT10, the surface roughness of the workpiece is generally 12.5-6.3μm, but after drilling is completed, reaming and reaming are often used to carry out subsequent semi-finishing and finishing.

B. Milling

Milling is the most important processing procedure of the machining center. It can be said that all the machining processes of the machining center are carried out by milling. Acupuncture can be divided into ni according to the direction of spindle movement and workpiece feed.

C. Boring

Boring is generally used for the processing of the inner diameter. It is a machining process that uses a tool to enlarge the hole or cut the inner diameter of a circular contour. It is generally used for the tolerance of the boring accuracy of steel workpieces from semi-roughing to finishing. The grade can reach IT9-IT7, and the surface roughness is 2.5-0.16μm. 

Among the current machining processes, grinding requires the highest precision and the lowest tolerance level. The tolerance levels of stamping and die-casting are both high. Only by understanding the precision tolerance of each process can we make the CNC machining center play the characteristics of high precision. Different products in different industries have different precision levels. As practitioners and manufacturers, it is necessary to understand and pay attention to the actual needs of user products. For example, medical and auto parts have relatively high precision requirements. The precision requirements are relatively low.