Turning Insert Protrusion Geometry for Chip Breakage at High Feed
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Solution Overview
Problem
Existing turning inserts face challenges in efficiently managing chip breakage and maintaining tool life during machining operations, particularly in high-feed applications, where power requirements are high and chip flow is inadequate.
Innovation Solution
The turning insert design features two wiper edges forming a corner angle between 135 and 160 degrees, island and peninsula protrusions strategically positioned to enhance chip breakage and surface finish, and a combination of lowered and raised edge portions connected by transition edges, along with a unique distribution of island protrusions to improve chip flow and tool orientation versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional turning inserts are used for high-feed machining, then productivity is improved, but power requirements become excessively high and chip flow becomes inadequate
Solution Approach 1:
The cutting insert is segmented into multiple functional zones with distinct protrusions (island and peninsula structures) that divide the chip flow path into multiple channels. This segmentation allows chips to be broken and directed through separate flow paths, reducing resistance and power requirements while maintaining high feed rates
Solution Approach 2:
The invention introduces three-dimensional protrusions (island and peninsula structures) that extend into the chip flow path from the rake face, creating additional spatial dimensions for chip management. These protrusions form multiple chip breakage surfaces and flow channels, effectively managing chip flow without increasing power consumption
2Productivity
If conventional turning inserts are used for high-feed machining, then productivity is improved, but chip breakage becomes inadequate
Solution Approach 1:
The cutting insert is segmented into multiple functional zones with distinct protrusions (island and peninsula structures) that divide the chip flow path into multiple channels. This segmentation allows chips to be broken and directed through separate flow paths, reducing resistance and power requirements while maintaining high feed rates
Solution Approach 2:
The island and peninsula protrusions act as intermediary structures that physically interact with the chip flow, creating multiple breakage points and redirecting chip movement. These protrusions serve as mediators between the cutting edge and chip flow, ensuring effective chip breakage at high machining speeds
3Ease of manufacture
If conventional turning inserts are used, then manufacturing simplicity is maintained, but versatility for different machining applications is limited
Solution Approach 1:
The cutting insert incorporates multiple functional features (island protrusions, peninsula protrusions, corner angle modifications, wiper edges) into a single design that can handle both high-feed and standard turning operations. This multi-functional design allows one insert to replace multiple specialized inserts, enhancing versatility without significantly complicating manufacturing
Solution Approach 2:
The invention modifies geometric parameters of the cutting insert (protrusion heights, angles, positions) to optimize performance across different machining applications. By adjusting these parameters, the same insert design can adapt to both high-feed and standard turning operations, enhancing versatility
Data Source
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Figure 11~12
AI summary
A turning insert (14) has two opposite main surfaces (16) and a peripheral surface (18) which extends therebetween and has N side surfaces, where 2<N<9. The insert (14) has mirror symmetry about a mid-plane (P) and 360/N degree rotational symmetry about a central axis (H) perpendicular to the mid-plane (P). The insert has two main edges (20) which each have N main cutting edges (22) and N corner cutting edges (24). Each main cutting edge (22) has two raised edge portions (28) and a lowered edge portion (26). Each main surface (16) has N main rake surfaces (31) and N corner rake surfaces (33). Each main surface (16) further has at least N convex island protrusions (34) and N at least partially convex peninsula protrusions (42), any and all island protrusions (34) associated with a given main rake surface (31) being located between two adjacent peninsula protrusions (42), each pair of adjacent peninsula protrusions (42) having at least one island protrusion (34) located therebetween.