Asymmetric Cutting Insert Edge Geometry for Force Distribution
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Solution Overview
Problem
Conventional cutting inserts with curved cutting edges that protrude outwardly from above suffer from inadequate cutting ability and uneven force distribution, leading to increased cutting resistance and reduced durability, particularly in regions farther from the end cutting edge.
Innovation Solution
A cutting insert design featuring an end cutting edge with a fixed height, a first major cutting edge with increasing height and gentle slope, and a second major cutting edge with decreasing height and increased inclination, along with a minor cutting edge, to distribute cutting forces more evenly and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cutting edge has a curved shape that protrudes outwards when viewed from directly above, then the impact force on the tip is reduced, but the cutting ability in the second region becomes insufficient
Solution Approach 1:
The cutting edge is designed with asymmetric curvature where the first region has a larger radius of curvature than the second region. This asymmetric design allows the first region to effectively reduce impact forces through its gentler curve, while the second region maintains sufficient cutting ability through its smaller radius of curvature and greater inclination angle.
Solution Approach 2:
Different regions of the cutting edge are given different geometric properties: the first region has a larger radius of curvature for impact reduction, while the second region has a smaller radius of curvature and greater inclination for effective cutting. This local differentiation of geometric qualities optimizes both impact resistance and cutting performance in respective regions.
2Force
If the cutting edge has a circular arc shape that is bilaterally symmetric, then the impact force is reduced, but the inclination in the second region is insufficient
Solution Approach 1:
The cutting edge transitions from a symmetric circular arc shape to an asymmetric curved shape where the radius of curvature varies along the length. The first region has a larger radius for force distribution, while the second region has a smaller radius for cutting efficiency, eliminating the need for bilateral symmetry.
Solution Approach 2:
The radius of curvature parameter is varied along the cutting edge length, with the first region having a larger radius and the second region having a smaller radius. This parameter change enables the cutting edge to simultaneously achieve good impact force distribution and sufficient cutting inclination in different regions.
3Manufacturing precision
If the cutting edge has a curved shape that protrudes outwards, then thinner chips are cut in the first region, but thicker chips require more force in the second region
Solution Approach 1:
The cutting edge is designed with locally differentiated geometric properties: the first region has a larger radius of curvature suitable for cutting thinner chips with less force, while the second region has a smaller radius of curvature and greater inclination angle to handle thicker chips that require more cutting force.
Solution Approach 2:
The cutting edge employs curved shapes with varying radii of curvature instead of straight or uniformly curved lines. The variation in curvature radius along the cutting edge allows optimization of chip thickness and cutting force characteristics for different regions.
Data Source
AI summary
A cutting insert includes an end cutting edge, a first major cutting edge, and a second major cutting edge. The height of the end cutting edge relative to an imaginary plane orthogonal to a central axis of a through-hole is fixed. The height of the first major cutting edge relative to the imaginary plane increases, when viewed from a side, moving away from the end cutting edge. The height of the second major cutting edge relative to the imaginary plane decreases, when viewed from a side, moving away from the first major cutting edge. When viewed from a side, the angle of inclination, relative to the imaginary plane, of an imaginary line connecting both ends of the second major cutting edge is greater than an angle of inclination, relative to the imaginary plane, of an imaginary line connecting both ends of the first major cutting edge.