Nc machining processes can be generally divided by the following methods:
(1) tool concentration is used by sequence of points in the same division, cutting tool to finish machining parts can finish all the parts. In the first ErBaDao, 3rd finished they can finish the other parts. So can reduce the number of compressed air, change process of time, reduce unnecessary positioning error.
(2) with the machining parts points for processing method of sequence, but many parts of content according to its structure characteristics will be divided into several parts and machining parts, such as in shape, curved or plane. Generally, the first plane positioning surface processing, after processing hole, First machining simple geometric shapes, processing complex geometric shapes, The first low precision machining parts, reprocessing higher accuracy.
(3) with coarse, machining sequence method for easy happening portion of the machining deformation due to rough machined parts, may occur after the deformation and need for school, generally all fractal rough and processed to all processes.
To sum up, the process, must see part's structure and function of machine technology, stress, and the content of nc machining parts, installation and the number of units to produce mastering organization situation. Another suggestion by using the principle of concentration process is the principle of process, according to the actual situation, but must strive to determine reasonable.

According to the arrangement of order processing structure and blank and orientation of the need to consider clamping workpiece is pressurized cylinder, the rigidity was not damaged. According to the following principles should be generally order:
(1) the procedure of processing can influence the next working location and clamping with general machining processes are also considered.
(2) the advanced image processing industry, inner cavity shape after processes.
(3) in the same position, clamping way or the same knife processing procedure, to reduce the best connection, change repositioning number plate and move.
At the same time; (4) the installation process, should be more rigid damage to arrange the small workpiece.
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