Cutting Insert Flat Edge Land Width Optimization
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Solution Overview
Problem
Existing cutting inserts face challenges in achieving both satisfactory cutting performance and durability, with previous designs either compromising on durability due to lack of land surfaces or experiencing performance deterioration due to excessive rake angles.
Innovation Solution
A cutting insert design featuring a flat cutting edge with a land surface and rake surface configuration, including varying land surface widths and rake angles, which enhances strength and smooths chip flow, thereby maintaining performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rake surface with a large rake angle is provided inside the flat cutting edge, then cutting performance is improved, but durability deteriorates
Solution Approach 1:
The rake surface is segmented into multiple regions with different rake angles: a first rake surface region with a larger rake angle for improved cutting performance, and a second rake surface region with a smaller rake angle for enhanced durability. This segmentation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the rake surface are assigned different local properties (rake angles) according to their functional requirements. The first rake surface region has a larger rake angle localized at the cutting edge for smooth chip flow, while the second rake surface region has a smaller rake angle localized toward the insert body for structural strength and durability.
2Productivity
If no land surface is provided, then cutting performance is maintained, but durability deteriorates
Solution Approach 1:
A land surface is provided only in the second rake surface region with a smaller rake angle, creating a localized support structure that enhances durability without interfering with the cutting action at the first rake surface region. The land surface acts as a localized reinforcement zone.
Data Source
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AI summary
A cutting insert of an embodiment includes a cutting edge located at an intersecting part of an upper surface and a side surface. The cutting edge includes a corner cutting edge located at a corner part of the upper surface, a major cutting edge located at a side part of the upper surface, and a flat cutting edge located between the corner cutting edge and the major cutting edge. The upper surface includes a first land surface located along the corner cutting edge, a second land surface located along the major cutting edge, and a third land surface located along the flat cutting edge. A maximum value of a width of the third land surface is smaller than a maximum value of a width of each of the first land surface and the second land surface in a top view.