Cutting Insert Land Width and Crest Portions for Wear Resistance
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Solution Overview
Problem
Cutting inserts for difficult-to-cut materials like titanium and Ni alloys face issues with crater wear and chip breaking, where inserts with edge reinforcement suffer from short life due to fracture and those without lands have poor chip-treatment performance.
Innovation Solution
A cutting insert design featuring a land and breaker flute on the rake face with crest portions on the sloping surface, where the land width is 0.05 mm < T < 0.15 mm, and crest portions are arranged side by side in the depth direction, providing increased edge strength and effective chip breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a flat land is provided along the cutting edge for edge reinforcement, then tool life is improved, but chip breaking performance deteriorates
Solution Approach 1:
The patent applies local quality by providing a flat land only at the round corner portion of the cutting edge, not along the entire cutting edge. The width T of the flat land at the round corner portion is specifically controlled to be 0.05 mm < T < 0.15 mm, creating a localized reinforcement zone that strengthens the edge without interfering with chip breaking in other areas.
2Object-generated harmful factors
If no lands are provided to maintain sharpness, then chip treatment performance is improved, but edge strength deteriorates
Solution Approach 1:
The patent provides edge reinforcement only at the round corner portion where it is most needed, rather than along the entire cutting edge. This localized flat land maintains sharpness in the main cutting region while providing necessary strength at the corner, resolving the contradiction between sharpness and edge strength.
Solution Approach 2:
The patent controls the width parameter T of the flat land within a specific range (0.05 mm < T < 0.15 mm) at the round corner portion. This parameter optimization ensures sufficient edge strength without compromising chip breaking performance, allowing the insert to maintain sharpness while having reinforced corners.
3Duration of action of stationary object
If a wide flat land is provided for edge reinforcement, then tool life is improved, but chip breaking ability deteriorates
Solution Approach 1:
The patent restricts the flat land to only the round corner portion with a controlled width T of 0.05 mm < T < 0.15 mm, rather than providing a wide flat land along the entire cutting edge. This localized approach provides edge reinforcement exactly where needed without creating long chips that would hinder productivity.
Data Source
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AI summary
A cutting insert 1 includes a land 9 and a breaker flute 10 on a rake face, the land 9 providing a cutting edge 4 by intersecting a flank face 3. The breaker flute 10 includes breakers 11. A width T of a portion of the land 9 that extends along a portion of the cutting edge that is at a round corner portion is 0.05 mm < T < 0.15 mm. A plurality of crest portions 12 each extending over the entirety of the portion of the cutting edge that is at the round corner portion are provided on a sloping surface of the breaker flute 10 that is on a land side. The crest portions 12 are arranged side by side in a depth direction of the breaker flute 10. A rake angle θ of at least one of inclined surfaces that form each of the crest portions is expressed as θ > 20°.