Aluminum machining tool features introduced
As the overall carbide cutter has a very sharp cutting edge and the groove, in the processing of aluminum parts cutting force is small, and has a large chip space, Chip smooth, etc., so solid carbide CNC tool gradually replaced the traditional the high-speed steel cutting tools.
Further, the elastic modulus of the cemented carbide is about three times that of steel, which means that under the same load, the amount of deformation of solid carbide indexable tool only one-third. Solid carbide end mills also can be made into a spiral blade, so you can smoothly cut and cut, chip is also very stable and smooth, which helps to reduce the fluctuation of cutting force to suppress the resulting vibration tendencies.
Indexable insert tooling system can bring potential benefits for aluminum processing and finishing, especially with 25 to 100mm medium to large diameter cutting tool when. For aluminum machining indexable milling cutter without regrinding, with better security, versatility and higher metal removal rates, with unparalleled performance. However, in many cases the finish can not reach the desired level. But now CoroMill790 Sandvik Coromant through the new cutting edge blade, blade holder and clamping technology can achieve this.
CoroMill790 improvements when the new milling cutter concepts developed for aluminum processing, can be achieved when using indexable radial milling key breakthrough by modifying a series of parameters. The main technical difficulties include: a smooth cutting action and good chip formation, high material removal rate, low power consumption, good surface roughness and the smallest traces of knives to ensure the safety of high-speed tool.
Aluminum parts processing, especially when cutting small margin finishing, indexable cutting edges usually appear more blunt, often resulting in "plow" effect, the cutting edge is also easy to suddenly cut into the workpiece, causing a sudden increase in cutting force. Resulting in a sudden increase in the cutting force so that the knife is too large and the power demand is too high. The above-mentioned problems due to the cutting edge needs become more complex, it must be used when finishing a sharp positive rake angle of the cutting edge, and to ensure that metal removal rates when roughing, requires cutting edge with sufficient strength. Thus, taking into account the cutting force, cutting edge cut, chip formation, stability and blade positioning and clamping a need for a new approach to the use of indexable inserts.
When cutting force generated by the cutting edge when the milling tool cutting edge to cut the workpiece, suddenly crash will cause tool vibration. Cutting force generated depends on the chip thickness which is proportional to the feed. Initially the tool-induced vibration will change subsequent chip thickness, which in turn followed when cutting force variation caused by vibration when machining system intensifies, the thickness is likely to continue to increase. The direction and magnitude of changes in cutting forces largely determine the vibration tendencies. Such regeneration is also called flutter vibration, if unchecked, will increase the cutting force variation width, so that the surface roughness decreased after cutting to produce knives, and even lead to the cutting edge and tool damage, in addition will adversely affect the spindle.
To do this, we must start cutting suppress dramatic changes of cutting force to suppress the vibration trend, which is the main reason for the use of anti-vibration tools. However, in many cases, this is done by parameters optimized blade structure and implementation. Establish a desirable model is one of the main basis for the development of new blade geometry. Then, the advanced FEM simulation shows many answers, involving modular edge line, rake angle and chip breaker design and development and optimization of the cutting edge of new features after the knife blade surface. This is achieved by modal parameters measured and calculated based largely on the vibration waveform.
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