Multi-Rake Cutting Insert Geometry for Breakage and Swarf Control
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Solution Overview
Problem
Cutting inserts experience breakage resistance issues, necessitating an improvement in their design to enhance durability and swarf discharging characteristics.
Innovation Solution
The cutting insert design features a top surface with distinct rake faces and a ridgeline including a nose cutting edge, major cutting edge, and wiper cutting edge, with specific geometric configurations such as varying rake angles and shapes to distribute stress and improve swarf discharge, including a third rake face with a recess and a larger first distance relative to a second distance, and an arc-shaped recess.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cutting insert geometry is used, then manufacturing is simple, but breakage resistance is insufficient
Solution Approach 1:
The cutting insert geometry is segmented into multiple distinct rake faces (first, second, and third rake faces) with different functions. The third rake face is specifically designed to receive the nose cutting edge and is separated from the major cutting edge by a boundary line that is offset from the nose cutting edge position, creating distinct functional zones that improve stress distribution and breakage resistance
Solution Approach 2:
Different regions of the cutting insert are given different geometric properties tailored to their specific functions. The third rake face has a larger first distance (from nose cutting edge to boundary line) compared to the second distance (from boundary line to major cutting edge), creating local geometric variations that optimize both durability and swarf discharge characteristics in different areas
2Productivity
If standard rake face configuration is used, then manufacturing is easy, but swarf discharging characteristics are poor
Solution Approach 1:
The design introduces a third rake face that extends the traditional two-rake-face configuration into an additional geometric dimension. This third rake face, with its specific boundary line positioning and distance ratios, creates new spatial relationships that improve swarf discharge paths and reduce clogging while maintaining manufacturability through defined geometric parameters
3Stability of the object's composition
If boundary line is positioned at first end of nose cutting edge, then structure is simple, but stress distribution is poor
Solution Approach 1:
The boundary line positioning creates an asymmetric geometry where the first distance (from nose cutting edge to boundary line) is deliberately made larger than the second distance (from boundary line to major cutting edge). This asymmetric configuration optimizes stress distribution by creating a more favorable stress gradient across the rake faces, improving breakage resistance while maintaining clear geometric definitions for manufacturing
Data Source
AI summary
A ridgeline between the top surface and the side surface includes: a nose cutting edge portion having a curved line shape, the nose cutting edge portion having a first end and a second end opposite to the first end; a major cutting edge portion contiguous to the first end; and a wiper cutting edge portion contiguous to the second end. The top surface includes: a first rake face contiguous to the wiper cutting edge portion; a second rake face contiguous to the major cutting edge portion; and a third rake face contiguous to the nose cutting edge portion and contiguous to each of the first rake face and the second rake face. A boundary line between the second rake face and the third rake face is separated from the first end and is contiguous to the major cutting edge portion.