High-speed milling of sidewalls of thin-walled structural parts
The relative rigidity is low, so the processing skill is poor. Under the influence of cutting force, cutting heat, cutting vibration and other factors, it is easy to process deformation, and it is difficult to control the machining accuracy and improve the machining efficiency. The problem of machining deformation and processing efficiency has become an important constraint for the processing of thin-walled structures. Therefore, for the special structure of the milling cutter and the characteristics of the machine tool, an effective milling method is proposed, which makes a new breakthrough in the processing technology of the thin-walled parts.
I. Optimize high speed milling toolpath
The key to machining thin-walled parts with high-speed cutting technology is the stability of the cutting process.
A lot of experimental work has proved that as the wall thickness of the part is reduced, the rigidity of the part is reduced. The machining deformation is increased, and the chattering vibration is prone to occur, which affects the processing quality and processing efficiency of the parts.
A tool path optimization scheme that takes full advantage of the overall rigidity of the part. The idea is to apply as much as possible the unmachined part of the part as a support for the milling part during the cutting process, so that the cutting process is in a state of better rigidity.
figure 1 Thin wall (sidewall) processing schematic, figure 2 Schematic diagram of single-axis milling, image 3 Schematic diagram of two-axis milling
As shown in Figure 1. For the milling of the side wall, the large radial depth of cut and small axial depth of cut milling are used within the allowable range of cutting. Make full use of the overall rigidity of the part (see Figure 1 (a)). In order to prevent the tool from interfering with the side wall, special shape milling cutters can be selected or designed to reduce the deformation and interference of the tool on the workpiece (see Figure 1(b)).
II. Double spindle machining control deformation
The use of parallel twin-spindle machining of thin-walled parts effectively controls the machining deformation of thin-walled parts. The machining accuracy and machining efficiency of the parts are significantly improved, and it can be applied to the side wall processing of simple shapes. However, the limitation is that the method can only process the side wall of a simple thin-walled part, and has a requirement for the spacing of the double-spindle of the machine tool, and the structure is complicated, which is not suitable for general use.