Turning Insert Edge Geometry for Secure Mounting and Strength
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Solution Overview
Problem
Conventional round cutting inserts face challenges in securing them in the insert seat due to insufficient friction, leading to potential rotation and reduced strength, and the introduction of straight segments compromises robustness.
Innovation Solution
A cutting insert design with circular and intermediary segments having different radii of curvature, ensuring smooth transitions and a non-circular edge profile that facilitates secure mounting and indexing, enhancing robustness and cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional round cutting insert is used, then the cutting insert has strong cutting edges and can be used at high feed rates, but the friction force between the peripheral surface and the insert seat is insufficient to prevent rotation of the cutting insert
Solution Approach 1:
The cutting insert employs a non-circular peripheral surface with varying radius of curvature, creating an asymmetric geometry that provides complementary flat portions for reliable positioning in the insert seat while maintaining strong cutting edges throughout the circumferential direction
2Reliability
If indentations are provided in the bottom surface of the cutting insert to prevent rotation, then the positioning reliability is improved, but the strength of the cutting insert is reduced and premature breakage occurs
Solution Approach 1:
The asymmetric peripheral surface geometry with varying radius of curvature provides inherent positioning stability through flat portions that interact with the insert seat, eliminating the need for additional indentations or projections that would compromise the structural integrity of the cutting insert
3Reliability
If straight segments are introduced to improve positioning reliability, then the flat portions provide better mounting stability, but the robustness of the cutting insert is reduced when compared to a conventional round cutting insert
Solution Approach 1:
The cutting insert features a peripheral surface with continuously varying radius of curvature, creating smooth curved transitions between different regions. This curved geometry provides stable positioning through naturally形成的 flat portions while maintaining the robustness and structural integrity associated with rounded forms, avoiding the weakness introduced by sharp straight segments
Data Source
Figure 1~4
Figure 5~6
AI summary
The invention relates to a cutting insert (1) for a turning tool, the cutting insert comprising a first surface (2) and a second surface (3), wherein the first and second surfaces are arranged opposite each other and facing opposite directions. The cutting insert further comprises a peripheral surface (4) connecting the first surface (2) and the second surface (3). A central axis (C) of the cutting insert extends from the first surface to the second surface. An edge formed by an intersection between the first surface and the peripheral surface, when seen in a plan view of the first surface, includes a plurality of circular segments (5), each having a radius of curvature (r), and a corresponding number of intermediary segments (6) interposed between the circular segments (5). Each circular segment (5) has a first length of extension (L1) and each intermediary segment (6) has a second length of extension (L2), wherein the first length of extension (L1) is greater than the second length extension (L2). The radius of curvature (r) of the circular segments is smaller than a maximum radial distance (Rmax) from the central axis (C) to the edge.