Asymmetric Turning Insert Corners for Variable-Depth Machining
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Solution Overview
Problem
Existing cutting inserts, particularly round inserts, are limited in versatility and strength, making them unsuitable for various machining operations and prone to damage during varying cutting depths.
Innovation Solution
A cutting insert design with distinct corner edges of varying lengths and curvatures, allowing for robustness and adaptability in different machining orientations and feed directions, and secure mounting in a turning tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If round cutting inserts are used to achieve high strength and take heavy cuts, then the cutting insert strength is improved, but the versatility with respect to machining operations is worsened
Solution Approach 1:
The cutting insert employs asymmetric corner edge design where two adjacent corner edges have different lengths of extension. The first corner edge has a longer extension length providing robustness for varying cutting depths, while the second corner edge has a shorter extension length enabling use in operations where the insert approaches shoulders or contours. This asymmetric configuration allows the same insert to handle both heavy cuts and versatile machining operations.
2Manufacturing precision
If sharp corner edges are used to achieve precise cutting, then the cutting precision is improved, but the reliability under varying cutting depths is worsened
Solution Approach 1:
Different corner edges of the cutting insert are designed with different local qualities. The first corner edge features a longer extension length creating a less sharp, more robust profile that is insensitive to sudden cutting depth changes. The second corner edge has a shorter extension length providing a sharper profile for precise cutting in controlled operations. This local differentiation allows each corner edge to be optimized for its specific function.
3Device complexity
If a single corner edge configuration is used to simplify the insert design, then the device complexity is reduced, but the adaptability to different feed directions is worsened
Solution Approach 1:
The cutting insert is designed with multi-functionality by incorporating two adjacent corner edges with different extension lengths on the same insert body. This configuration enables the insert to perform multiple functions: the first corner edge handles longitudinal turning with varying depths, the second corner edge handles operations approaching shoulders or contours, and the insert can be used in both forward and reverse feed directions. This universal design eliminates the need for multiple specialized inserts.
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 surface (2) and a second surface (3), wherein the first and second surfaces are arranged opposite each other and facing opposite directions; and - a peripheral surface (4) connecting the first surface (2) and the second surface (3). An intersection between the first surface and the peripheral surface forms an edge that includes four side edges (5) and four corner edges (6) arranged alternately such that the corner edges (6) are located pairwise opposite each other, and wherein, in a plan view of the first surface, each corner edge is formed by one or more curvilinear segments. Each corner edge of a first pair (61) of the corner edges has a first length of extension (L1), and each corner edge of a second pair (62) of the corner edges has a second length of extension (L2), wherein the first length of extension (L1) is at least two times greater than the second length of extension (L2).