Asymmetric Turning Insert Layout for Deep Internal Radial Cutting
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Solution Overview
Problem
Existing turning tools face challenges in achieving a large radial cutting depth during internal turning operations due to space limitations, especially with small tools, when using indexable cutting inserts.
Innovation Solution
An asymmetric indexable cutting insert with a specific design featuring two cutting edges, each with a nose cutting edge, primary cutting edge, and secondary cutting edge, arranged to minimize radial extension into the tool body while maximizing radial extension out, allowing for a significant cutting depth and efficient tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a symmetric indexable cutting insert is used, then the cutting insert can be indexed by a pre-defined angle and fit in the insert seat, but it is difficult to achieve a large radial extension out from the tool body due to space limitations
Solution Approach 1:
The cutting insert is designed with an asymmetric geometry where the first and second cutting edges are positioned at different radial distances from the central axis. The first cutting edge has a larger radial extension than the second cutting edge, allowing the insert to achieve large radial cutting depth while maintaining indexability. The asymmetric design includes different relief surface configurations and rake face orientations for each cutting edge.
2Length of moving object
If the cutting insert extends significantly in radial direction out from the tool body, then large radial cutting depth is achieved, but the space requirements within the tool body increase
Solution Approach 1:
The cutting insert utilizes asymmetric positioning in the radial direction, where one cutting edge extends further radially than the other. This dimensional asymmetry allows the insert to achieve large radial cutting depth with the first cutting edge while the second cutting edge is positioned closer to the tool body, thereby reducing the overall space requirements within the tool body and allowing for more compact tool design.
3Length of moving object
If a large radial extension is achieved, then significant cutting depth is possible, but the tool size and complexity increase
Solution Approach 1:
The cutting insert is segmented into two distinct cutting edges with different functional characteristics. The first cutting edge is designed for primary cutting operations with larger radial extension, while the second cutting edge can be used for finishing or light-duty operations. This segmentation allows each edge to be optimized for its specific function, achieving large radial extension where needed without unnecessarily increasing overall tool complexity.
Data Source
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AI summary
The invention relates to a cutting insert (1) for a turning tool, the cutting insert comprising a first side (2) including a first rake face (11), and a second side (3) including a second rake face (12), wherein the first and second sides are arranged opposite each other and facing opposite directions. The cutting insert comprise a peripheral surface (4) connecting the first side (2) and the second side (3), wherein the peripheral surface (4) includes a first relief surface (7) and a second relief surface (8). A first cutting edge (5) is arranged at the intersection between the first relief surface (7) and the first rake face (11), and a second cutting edge (6) is arranged at the intersection between the second relief surface (8) and the second rake face (12), wherein the first cutting edge (5) comprises a first nose cutting edge (51) and the second cutting edge (6) comprises a second nose cutting edge (61). When the cutting insert (1) is seen in a plan view of the first or the second side (2, 3), a first line (r1) that extends from the geometric center (GC) of the cutting insert (1) to the center (C1) of the first nose cutting edge (51) forms an insert angle (α) to a second line (r2) extending from the geometric center (GC) of the cutting insert (1) to the center (C2) of the second nose cutting edge (61). The cutting insert (1) has only two cutting edges (5, 6), each cutting edge including a nose cutting edge (51, 61), and the insert angle (α) is between 90° and 175°. The invention also relates to a turning tool (10) comprising such cutting insert.