Negative Cutting Insert Structure to Shield Unused Cutting Edges
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Solution Overview
Problem
In negative type cutting inserts, residue generated during cutting can collide with unused cutting edges, causing damage and reducing cutting performance.
Innovation Solution
A cutting insert design with an intermediate peripheral side surface portion protruding outward, covering the unused cutting edge and flank to prevent collision with residue, while maintaining the economic use of multiple cutting edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutting edges are arranged on both end surfaces to increase usability, then the number of usable cutting edges increases, but residue from cutting can collide with unused cutting edges causing damage
Solution Approach 1:
The peripheral side surface is segmented into three distinct portions: first and second peripheral side surface portions that are inclined away from the center, and an intermediate peripheral side surface portion that protrudes outward. This segmentation creates protective zones that isolate unused cutting edges from residue collision while preserving multiple usable cutting edges on both end surfaces.
Solution Approach 2:
The intermediate peripheral side surface portion acts as an intermediary protective structure between the cutting edges and the residue generated during cutting. This protruding portion physically blocks residue from reaching the unused cutting edges, thereby preventing damage without affecting the usability of the cutting edges.
2Reliability
If the peripheral side surface is extended outward to protect cutting edges, then cutting edge protection improves, but the device complexity increases
Solution Approach 1:
The protective structure is applied locally only where needed - the intermediate peripheral side surface portion protrudes outward specifically in the region where unused cutting edges are vulnerable to residue collision. The first and second peripheral side surface portions maintain simpler inclined geometries. This localized application provides protection without unnecessarily complicating the entire peripheral side surface structure.
Data Source
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AI summary
A cutting insert (1) comprises: a first end surface (2) and a second end surface (3) which are opposed to each other; a peripheral side surface (4) which extends so as to connect the first end surface (2) and the second end surface (3); a first cutting edge (5a) which is arranged in an intersecting edge between the first end surface (2) and the peripheral side surface (4); and a second cutting edge (5b) which is arranged in an intersecting edge between the second end surface (3) and the peripheral side surface (4). The peripheral side surface (4) includes a first flank (4a1) which is connected to the first cutting edge (5a) and an intermediate peripheral side surface portion (4b) which is arranged closer to the second end surface (3) than the first flank (4a1). The first flank (4a1) extends in a direction perpendicular to the first end surface (2). The intermediate peripheral side surface portion (4b) protrudes outward from the first flank (4a1).