Indexable Cutting Tool Layout for Chatter-Resistant Milling
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Solution Overview
Problem
Conventional indexable cutting tools with different axial and radial rake angles for outer circumferential blades lead to uneven cutting abilities and increased chatter vibration due to periodic vibrations during the cutting process.
Innovation Solution
An indexable cutting tool design with uniformly set axial and radial rake angles for all outer circumferential blades, featuring grooves with alternating intervals to ensure unequal abutment timings and prevent resonance, thereby stabilizing cutting performance and simplifying strength setting across the tool main body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the axial rake angles and radial rake angles of outer circumferential blades are made different from each other, then chatter vibration is inhibited, but cutting ability is lowered
Solution Approach 1:
The invention divides the outer circumferential blades into multiple groups (first group, second group, third group) with different angle configurations. Each group has blades with specific axial and radial rake angle combinations, creating segmented zones around the tool circumference. This segmentation allows different blade groups to engage the workpiece at different times, breaking the periodicity of vibrations while maintaining consistent cutting performance within each group.
Solution Approach 2:
The invention applies local quality by giving different axial and radial rake angle characteristics to different groups of blades at specific circumferential positions. The first group has angles optimized for one cutting condition, the second group for another, creating locally optimized cutting zones. This ensures that while individual blades have varied angles, each local zone maintains appropriate cutting characteristics.
2Object-affected harmful factors
If the axial rake angles and radial rake angles of outer circumferential blades are made different from each other, then chatter vibration is inhibited, but uniformity of cutting ability across blades is reduced
Solution Approach 1:
The invention divides the outer circumferential blades into multiple groups (first group, second group, third group) with different angle configurations. Each group has blades with specific axial and radial rake angle combinations, creating segmented zones around the tool circumference. This segmentation allows different blade groups to engage the workpiece at different times, breaking the periodicity of vibrations while maintaining consistent cutting performance within each group.
Solution Approach 2:
The invention creates equipotential cutting conditions by ensuring that blades within each group have identical axial and radial rake angles. This means that all blades in the first group have the same angle characteristics, all blades in the second group have the same (but different from first group) angle characteristics, and so on. This equipotential approach within groups ensures uniform cutting ability across blades of the same group, while the variation between groups prevents periodic vibration resonance.
Data Source
AI summary
An indexable cutting tool in which cutting ability can be ensured while suppressing the occurrence of chatter vibration. In outer circumferential blades provided on a tool main body, the axial rake angles are all set to the same angle, and so are the radial rake angles. With this configuration, the cutting ability of an indexable cutting tool can be ensured. Furthermore, the disposing intervals, in the circumferential direction of the tool main body, of the plurality of outer circumferential blades that are provided in, at least, a first groove of a plurality of groove are set to unequal values. With this configuration, it is possible to make the intervals at which the outer circumferential blades adjoining in the axis direction contact a workpiece unequal, suppressing resonance of periodic vibration occurring in cutting and, thus, suppressing the occurrence of chatter vibration.