Variable Land Width in Cutting Inserts for Stronger Nicked Edges
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Solution Overview
Problem
Cutting inserts with nicks suffer from reduced fracture resistance due to weak connecting parts between nicks and cutting edges, leading to a shorter tool life and increased risk of abnormal damage during machining.
Innovation Solution
The cutting insert design features a land with a greater width at the connecting portions between the cutting edge and nicks, enhancing strength while maintaining cutting ability by allowing a smaller width adjacent to the groove, thus preventing a reduction in cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nicks are provided in cutting edges to reduce chip size and cutting resistance, then cutting ability is improved, but fracture resistance of cutting edges deteriorates due to weak connecting parts
Solution Approach 1:
The land width is varied locally: it is increased at the connecting portions between nicks and cutting edges to strengthen these weak areas, while maintained at a smaller width in other areas to preserve cutting ability. This local differentiation of land width resolves the contradiction between improving cutting ability and maintaining fracture resistance.
2Strength
If land width at connecting portions is increased to strengthen the structure, then fracture resistance is improved, but cutting ability may be reduced due to larger land width
Solution Approach 1:
The land width is selectively increased only at the critical connecting portions between nicks and cutting edges, while remaining smaller in other regions. This localized approach ensures fracture resistance is improved without compromising cutting ability, as the smaller land width in non-critical areas maintains effective cutting performance.
Data Source
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AI summary
The present invention provides a cutting insert (1), comprising: a first end surface (2); a second end surface (3) opposing the first end surface; a peripheral side surface (4) connecting the first end surface and the second end surface; a cutting edge (6) extending along an intersecting edge between the first end surface and the peripheral side surface; a land (20) formed in the first end surface so as to extend along the cutting edge; and at least one groove (18) formed in the peripheral side surface. Each groove forms an opening in the first end surface and is formed so as to separate the cutting edge into a plurality of portions. When the cutting insert is viewed from a direction facing the first end surface, the land is formed such that a portion of the land which is adjacent to an end area (S) of the groove has a greater width than a width of a portion of the land which is distant from the groove.