Cutting Insert With Offset Edges For Chip Control
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Solution Overview
Problem
Cutting inserts for heavy-duty machining face challenges in achieving precise machining, good chip formation, and long service life under high cutting forces, particularly in plunge turning operations where existing designs with overlapping cutting edges lead to material breakout and reduced stability.
Innovation Solution
A cutting insert design featuring a central cutting edge and two secondary cutting edges offset from each other, with transition edges having a slight inclination (2° to 20°) to create non-cutting sections that stabilize the insert and enhance chip breaking, produced through powder metallurgy for cost-effectiveness and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting edges are designed to overlap or be directly adjacent to ensure continuous cutting, then smooth material removal is achieved, but position stability of the cutting insert deteriorates and material breakout occurs
Solution Approach 1:
The cutting edge is segmented into multiple discrete cutting edge sections (first, second, third, and fourth sections) that are offset from one another. Each section independently engages the workpiece material, providing stable positioning forces while removing material. The segmentation allows each section to contribute to both cutting and stabilization without requiring overlapping edges, thus resolving the contradiction between smooth material removal and position stability.
2Reliability
If multiple cutting edges are provided for chip division, then chip formation improves, but the complexity of the cutting edge design increases
Solution Approach 1:
The cutting edge is divided into multiple discrete sections (first, second, third, and fourth cutting edge sections) that are offset relative to each other. Each section functions as an independent cutting element, naturally dividing chips into separate strands as they are formed. This segmentation achieves reliable chip formation while maintaining a relatively simple overall design, as the sections are integrated into a single cutting edge structure rather than requiring separate components.
Data Source
Figure 1~2
Figure 3A~4
Figure 5A~5D
AI summary
The invention relates to a cutting insert (2) comprising a supporting surface (4) on the bottom side thereof, a centre cutting edge (14), two secondary cutting edges (16, 18) that are formed on both sides of the centre cutting edge (14) and are offset relative to the centre cutting edge (14), and two transition edges (20, 22), which respectively connect the centre cutting edge (14) to the adjacent secondary cutting edges (16, 18). Each of the two secondary cutting edges (16, 18) is formed vertically offset and optionally also offset in depth with respect to the centre cutting edge (14), and laterally spaced from the centre cutting edge (14). The transition edges (20, 22) each have in an edge overlap-free region at least over one section (50) an inclination n of 2° = n = 20° relative to a vertical direction (H) running perpendicularly to a primary extension plane of the supporting surface (4).