Polygonal Cutting Insert Structure for Stable Tool Restriction
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Solution Overview
Problem
Existing cutting inserts face challenges in maintaining restriction stability and strength, especially under strong forces, which can lead to damage and instability during cutting operations.
Innovation Solution
A positive-type cutting insert with a polygonal plate shape, featuring a rake face, seating surface, and side surface configuration that includes a flank face and connection surface, where the connection surface is positioned closer to the seating surface side than the flank face, enhancing restriction stability and strength by widening the flank face and increasing the seating surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of the restriction portion is increased to improve restriction stability, then the cutting insert becomes more stable on the tool main body, but the strength of the cutting insert may be compromised
Solution Approach 1:
The side surface is divided into two distinct surfaces: the flank face and the connection surface. This segmentation allows each surface to serve a specific function - the flank face provides restriction stability through increased contact area with the tool main body, while the connection surface maintains structural strength by being positioned strategically closer to the seating surface. The boundary line between these surfaces defines their respective roles in resolving the contradiction between stability and strength.
2Strength
If the connection surface is positioned closer to the seating surface side, then the rigidity and strength of the cutting insert are improved, but the area of the restriction portion may be reduced
Solution Approach 1:
Different regions of the side surface are assigned different qualities and functions. The connection surface, positioned closer to the seating surface, is optimized for providing rigidity and strength to the cutting insert structure. The flank face, positioned closer to the rake face, is optimized for providing restriction stability through increased contact area. This local differentiation of quality allows each region to excel at its specific function without compromising the other.
3Strength
If the distance from the seating surface edge to the cutting edge portion is shortened, then the strength of the cutting edge portion is improved, but the area of the seating surface may be reduced
Solution Approach 1:
The solution moves the problem from a two-dimensional trade-off to a three-dimensional configuration. By introducing the connection surface that extends in a different spatial dimension and orientation, the design can simultaneously achieve a shortened distance from the seating surface edge to the cutting edge portion (improving cutting edge strength) while maintaining an adequate seating surface area through the combined geometry of both the connection surface and flank face.
Data Source
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AI summary
A cutting insert includes a rake face configuring one of polygonal surfaces, a seating surface configuring the other one of the polygonal surfaces, and a side surface connecting the rake face and the seating surface to each other. The cutting insert has a cutting edge portion including a main cutting edge located in a side portion of the rake face, a subsidiary cutting edge connected to the main cutting edge, and a corner cutting edge connected to the subsidiary cutting edge and located in a corner portion of the rake face. The side surface includes a flank face and a connection surface which are adjacent to each other in a thickness direction via a boundary line. The connection surface is located on the seating surface side, and is located outside than an extension line of the flank face. The seating surface and a portion connected to the main cutting edge of the flank face function as restriction portions. The boundary line includes a first section extending along the main cutting edge, a second section extending along the subsidiary cutting edge and located closer to the rake face side than the first section, and a third section extending along the corner cutting edge and located closer to the seating surface side than the first section.