Turning Insert Chip Breaker Geometry for Low-Feed Longitudinal Turning
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Solution Overview
Problem
Existing turning inserts face challenges in chip control and chip breaking during longitudinal turning, particularly at low entering angles and low feed rates, especially when working with low carbon steel, which results in increased insert wear and poor surface finish.
Innovation Solution
A turning insert design with a nose angle of 71-85°, featuring a second protrusion with a chip breaker wall and a unique geometry that includes a first and second transition point, and a second chip breaker wall, which improves chip breaking and reduces insert wear by optimizing the cutting edge geometry and chip flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional turning insert design is used, then the insert can perform basic cutting operations, but chip control and chip breaking are insufficient at low entering angles and low feed rates
Solution Approach 1:
The chip breaker is divided into multiple segments including a first chip breaker wall, a second chip breaker wall, and a third chip breaker wall, each with different geometries and positions. This segmentation allows each wall to handle different aspects of chip control, providing effective chip breaking across a wider range of cutting conditions including low feed rates and low entering angles
Solution Approach 2:
Different portions of the chip breaker have different geometries and orientations optimized for specific functions. The first chip breaker wall has a first geometry, the second chip breaker wall has a second geometry, and the third chip breaker wall has a third geometry. This local differentiation allows optimal chip control at various locations along the cutting edge, particularly improving performance at low feed rates
2Productivity
If existing turning insert geometry is used, then the insert can machine at various feed rates, but insert wear increases at low feed rates and low entering angles
Solution Approach 1:
The cutting insert features a dynamic chip breaker design where the second chip breaker wall is positioned at an angle relative to the first chip breaker wall, creating a progressive chip breaking action. This dynamic geometry adapts to different cutting conditions, maintaining optimal chip control and reducing wear even at low feed rates and low entering angles, thereby extending insert life
Solution Approach 2:
The invention introduces a third chip breaker wall that extends in a direction different from the first and second chip breaker walls, adding a dimensional aspect to chip control. This three-dimensional chip breaker configuration provides additional chip breaking action that reduces insert wear across varying feed rates and entering angles
3Manufacturing precision
If standard chip breaker design is used, then the insert can handle moderate cutting conditions, but surface finish deteriorates at low feed rates
Solution Approach 1:
The third chip breaker wall is specifically designed with a geometry optimized for producing fine surface finishes. This wall is positioned to interact with chips during low feed rate cutting, providing local quality improvement in the form of better surface finish specifically where needed, without compromising overall machining efficiency
Data Source
AI summary
A turning insert includes a top surface, an opposite bottom surface, and a reference plane located parallel to and between the top and the bottom surfaces. A nose portion includes a convex nose cutting edge, and a first and a second cutting edge. The nose cutting edge connects the first and second cutting edges. The first and second cutting edges form a nose angle of 71-85° relative to each other. The nose portion has a third convex cutting edge adjacent to the first cutting edge and a fourth cutting edge adjacent to the third convex cutting edge. The fourth cutting edge forms an angle of 10-30° relative to a bisector. The distance from at least a portion of the fourth cutting edge to the reference plane increases at an increasing distance from the nose cutting edge. A second protrusion is arranged between the nose cutting edge and the first protrusion.