Feed adjustment when milling curved surfaces

Recently, there has been a trend to perform most manufacturing operations on one machine-tool. Such technology requires machining various internal and external cylindrical surfaces using not turning but milling machines. However, the role of feed in milling curved surfaces is not sufficiently studied in the scientific literature. The developed calculation method makes it possible to study the influence of milling parameters for curved surfaces on the maximum thickness of the cut layer. It is established that when milling convex surfaces, the maximum thickness of the cut layer decreases relative to that for plane milling, while for concave surfaces it increases. Equations are obtained for calculating feed per tooth for the cut layer thickness when milling curved surfaces. It is shown that the feed calculated for milling flat surfaces cannot be used for curved surfaces and, therefore, should be adjusted. The relative radius of curvature and the relative thickness of milling have an impact on the feed adjustment. The smaller these values, the larger the value of the feed adjustment should be. The range of values that requires feed re-calculation relative to the feed for flat milling is determined.

References

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