Cutting Insert Chip Breaker Curved Raised Portion
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Solution Overview
Problem
The existing cutting inserts face issues with high cutting resistance due to excessive contact with chips, particularly at large depths of cut, and instability in chip curling at small depths of cut, leading to inefficient chip processing.
Innovation Solution
A cutting insert design featuring a chip breaker groove with a raised portion that includes a front raised surface and side raised surfaces, which are curved to control and separate chips effectively, reducing contact and scatter, and adjusting the geometry to accommodate varying depths of cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat inclined raised portion is provided in the chip breaker groove, then chip blocking is enhanced, but cutting resistance increases due to large contact area between the raised portion and chips
Solution Approach 1:
The raised portion in the chip breaker groove is designed with a curved surface instead of a flat inclined surface. This curvature reduces the contact area between the raised portion and the chips, thereby decreasing cutting resistance while maintaining effective chip blocking and processing stability.
2Reliability
If a two-stage construction with projecting portion and protruding portion is used, then chip curling is improved at small depths of cut, but chip blocking becomes excessive at large depths of cut, increasing cutting resistance
Solution Approach 1:
The chip breaker groove is designed with different regions having different functions: a first region with a projecting portion for effective chip curling at small depths of cut, and a second region with a protruding portion that has reduced blocking capability for large depths of cut. This local differentiation allows the same groove structure to adapt to varying cutting conditions without excessively increasing cutting resistance.
3Force
If the raised portion is designed for effective operation at large depth of cut, then cutting resistance is reduced, but chip curling becomes unstable at small depth of cut
Solution Approach 1:
The chip breaker groove incorporates distinct regions with different geometries optimized for different depth of cut conditions. The first region with the projecting portion provides stable chip curling at small depths of cut, while the second region with the protruding portion reduces cutting resistance at large depths of cut, allowing the structure to effectively handle both scenarios.
Data Source
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AI summary
A cutting insert is provided which enables a reduction in cutting resistance and stable process. The insert includes a chip breaker groove formed inside corner cutting edges and a raised portion. The raised portion includes a top surface, a front raised surface, and side raised surfaces. The top surface crosses the front raised surface and each of the side raised surfaces. A first intersecting portion at which the front raised surface and the top surface intersects with each other is linearly extended. A second intersecting portion at which each of the side raised surfaces and the top surface intersect with each other is extended from a corresponding one of opposite sides of the first intersecting portion so that a distance from the corresponding side cutting edge increases gradually with a distance from the corner cutting edge. The front raised surface and the side raised surfaces are curved convexly outward.