Discussion on high speed cutting technology in non-standard parts processing
In non-standard parts processing, high-speed cnc machining not only can greatly shorten the processing time, improve processing efficiency, reduce processing costs, and can make parts with better looking and more accuracy. High-speed cnc machining has the following main features:
(1) Reduced thermal deformation of the parts. In High-Speed CNC Machining, since the material are cut off in a very short time, most of the cutting heat is taken away by the scraps, so the temperature of the part is not high, not only reduced the possibility of heat deformation, but also avoided stress crack, thermal crack and other surface defects.
(2) Be beneficial to ensure the size, shape and position accuracy of the OEM Milling parts. In the high-speed cnc machining, due to the softening of the cutting layer of the material, the unit cutting force reduced, it’s much benefit to process the deformation for thin wall and poor rigidity parts.
(3) Achieved better processing surface quality. High-speed cnc machining can reduce the depth of the surface hardening layer, reduce the residual stress and microstructure’s thermal damage of the surface layer, thereby reducing possibility changes of mechanical, physical and chemical properties of the surface layer, ensuring the inherent quality of the finished surface and the usability of parts.
(4) Reduced vibration of process system. In ultra-high-speed machining, the spindle speed is very high, the excitation frequency away from the natural frequency of the machine, thus reducing the process system vibration, improve the processing quality.
(5) Significantly improve the material removal rate. While increasing the cutting speed can increase the feed rate, thereby significantly improving the material removal rate. For example, ultra-high-speed milling, when maintaining the same cutting thickness (feed engagement and cutting depth of the same), the feed rate than conventional milling can be increased 5 to 10 times, so as to achieve a high material removal rate.
High-speed milling has been widely used in the automotive industry, aerospace industry and mold manufacturing industry, processing aluminum, magnesium and other light metal alloys, steel and cast iron. Such as automobile engine cylinder, cylinder head, reducer shell, the aircraft's overall aluminum thin-walled parts, hardened die steel and nickel-based alloys, titanium and other difficult processing materials. The strategy to improve the material removal rate has been shifted from strong with slow to light with fast, the machine changed from the strong type (to improve the mechanical characteristics of parameters) to high-speed type (to improve the speed characteristics of parameters).
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