Jan 30, 2020 Viewed: 193 Tags: cncmachining   turning-milling  

CNC turning and milling complex machining programming is difficult

A CNC turn-milling complex machining of a new part requires multiple programming actions, such as: CNC turning, multi-axis milling, 3 + 2 positioning machining, drilling and other machining programming. It is more difficult in actual operation. Therefore, generally, the programmers who have some experience in programming are basically teachers. Even if you are young, you still need technical skills to complete a programming operation on your own.

Generally, the UGNX and CATIA systems can also be used for CNC turning and milling through programming function modules. When rough machining of reversed surfaces, inclined walls and contour cavities, you can use the solid, appearance or curve to define the area to be processed and cut off. Most of the blank materials are suitable for rough machining of all shapes and inner cavities of reversing parts. During roughing, a machining strategy that follows the part is adopted, and the machining toolpath is formed by shifting the same number of steps along the few boundaries of the part. When encountering the intersection, one of the toolpaths is trimmed away.

Under this processing strategy, the peripheral margin can be eliminated, and this processing strategy is particularly suitable for cavity processing. The chaotic curved surface has a rugged appearance, and the slope changes greatly. When 3-axis CNC machining is performed, the continuous change of cutting depth and cutting width will cause unstable tool load, increase tool wear, and reduce processing quality. It is easy to interfere with the tool and the workpiece on the surface with a large degree of convexity and concavity, with serious consequences. The 3 + 2 positioning method can overcome the shortcomings of 3-axis CNC machining of chaotic curved surfaces. CNC turning and milling composite machining positioning 3 + 2 machining refers to turning the B and C axes to a certain point of view and locking and then processing. After the processing of one area is completed, the B and C are adjusted according to the normal vector direction of the other processing area. From the viewpoint of the C axis, CNC turning and milling compound machining is continued.

Its essence is to change the five-axis coordinated processing into a fixed-view processing in a certain direction, and the tool axis direction is no longer changed during processing. Since the CNC turning and milling composite machining can be completed in one positioning, compared with 3-axis CNC machining, 3 + 2 positioning machining has significant advantages in efficiency and quality. Turn-milling multi-axis milling finishing solution. Multi-axis linkage machining method is used to finish the machining of multiple messy fragment surfaces on the cylindrical part of the messy reversal part, and the machining number, driving method and related parameters are selected. In actual processing, the characteristics of the machine tool should be fully utilized. It is useful to control the size of the swing angle of the tool to make the displacement and swing angle match well to prevent overcutting. In order to reduce the sharpness of the swing angle change of the tool at the corner of the part, when the corner of the part is processed, a transitional tool position should be appropriately added, which is also conducive to the smooth operation of the machine tool, preventing overcutting and improving the appearance of the part.

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