Cutting Insert with Varying Rake Angles for Burr Control
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Solution Overview
Problem
Cutting inserts for difficult-to-cut materials like stainless steel face challenges in maintaining edge strength to prevent fracturing and chipping, while also controlling burr formation and abnormal wear.
Innovation Solution
A cutting insert design featuring a cutting edge with distinct regions: a third region with a higher rake angle for increased sharpness, and first and second regions with smaller rake angles but greater wedge angles for enhanced strength, positioned strategically to manage burr occurrence and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the rake angle of the cutting edge is increased to improve sharpness and suppress burr formation, then the cutting edge becomes weaker and more prone to chipping and fracturing
Solution Approach 1:
The cutting edge is designed with spatially varying rake angles: a third region at the cutting boundary with a larger rake angle (15° to 30°) to suppress burrs, and first and second regions with smaller rake angles (5° to 15°) to maintain strength. This local differentiation allows each region to perform its specific function optimally without compromising the other.
2Strength
If the cutting edge is made stronger by increasing wedge angle to prevent fracturing and chipping, then the cutting edge becomes less sharp and more prone to burr formation and abnormal wear
Solution Approach 1:
The cutting edge is designed with spatially varying rake angles: a third region at the cutting boundary with a larger rake angle (15° to 30°) to suppress burrs, and first and second regions with smaller rake angles (5° to 15°) to maintain strength. This local differentiation allows each region to perform its specific function optimally without compromising the other.
3Device complexity
If a uniform rake angle is applied along the entire cutting edge, then the design is simple, but it cannot simultaneously optimize both sharpness at the cutting boundary and strength at the corner section
Solution Approach 1:
The cutting edge is divided into three regions (first, second, and third) with different rake angles optimized for their specific locations. The third region at the cutting boundary has a larger rake angle for sharpness, while the first and second regions have smaller rake angles for strength, achieving optimal overall performance through localized optimization.
Solution Approach 2:
The cutting edge is segmented into three distinct regions along its length, each with independently optimized rake angles. This segmentation allows the design to address different functional requirements at different locations, improving overall reliability without excessive complexity.
Data Source
AI summary
The present invention relates to the cutting insert having a cutting edge which has a corner section that forms a convex arc shape when seen in a planar view from direction facing the rake face and a linear section that is in contact with the corner section at least at one end of the corner section and extends linearly. The cutting edge is provided with a first region along the corner section when seen in a planar a second region along the linear section and a third region between the first region and the second region. A rake angle of the cutting edge in the third region is made greater than rake angles of the cutting edges in the first region and the second region.