Cutting insert with non-collinear chip breaking ramps
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Solution Overview
Problem
Existing cutting inserts struggle to effectively handle ductile materials while being affordable and adaptable to various feed rates and depths of cut.
Innovation Solution
A cutting insert design featuring a diamond-shaped body with bidirectional acute and obtuse cutting corners, varying land widths, an annular island with bulged extensions, and non-collinear chip breaking ramp surfaces that form at a non-zero angle with the cutting edge, enhancing chip breaking capabilities and allowing for higher feed rates and depths of cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cutting inserts are used to machine ductile materials, then the insert structure is simple and affordable, but chip breaking capability is insufficient
Solution Approach 1:
The cutting insert is divided into multiple functional zones including an annular island with segmented chip breaking points arranged at different radial positions. The chip breaking points are segmented into first, second, and third groups located at different distances from the cutting edge, creating a progressive chip breaking mechanism that effectively handles ductile materials while maintaining manufacturing feasibility
Solution Approach 2:
Different regions of the insert are given different geometric properties to perform specific functions. The annular island has varying thickness and chip breaking point configurations at different radial positions, with first chip breaking points closer to the cutting edge having different characteristics than second and third chip breaking points farther away, optimizing chip breaking for specific material types while keeping the overall structure manufacturable
2Productivity
If the insert is designed for high feed rates and depths of cut, then productivity increases, but chip breaking performance deteriorates
Solution Approach 1:
The insert design incorporates dynamic chip breaking capabilities through the annular island configuration with multiple groups of chip breaking points at different radial positions. This dynamic structure adapts to varying feed rates and depths of cut by providing progressive chip breaking action, allowing the insert to maintain effective chip breaking performance across a wide range of productivity parameters
Solution Approach 2:
The chip breaking mechanism extends into the radial dimension with chip breaking points arranged at multiple distances from the cutting edge. The first, second, and third groups of chip breaking points are positioned at different radial locations on the annular island, creating a three-dimensional chip breaking path that enhances performance at high feed rates and depths of cut while maintaining structural integrity
3Strength
If the land width is increased to resist depth of cut, then edge strength improves, but chip breaking capability is reduced
Solution Approach 1:
The insert features varying land widths at different locations to balance edge strength and chip breaking. The land width is optimized at the cutting edge for strength, while the annular island region has reduced width and incorporates chip breaking points to maintain chip breaking capability. This local differentiation allows the insert to resist depth of cut forces while preserving effective chip breaking performance
Data Source
AI summary
A cutting insert includes a body having an upper face, a lower face, a plurality of planar flank faces, bidirectional acute cutting corners and bidirectional obtuse cutting corners joining two adjacent flank faces. A land has a varying width. An annular island includes a plurality of bulged extensions, relatively longer and narrower chip breaking points proximate the acute cutting corners, and relatively shorter and wider chip breaking points proximate the obtuse cutting corners. A chip breaking ramp surface flanks each of the relatively longer and narrower chip breaking points and each of the relatively shorter and wider chip breaking points. The chip breaking ramp surfaces form a series of non-collinear lines that are at a non-zero angle with respect to the cutting edge.