Cutting Insert Land Geometry for High-Feed Fracture Resistance
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Solution Overview
Problem
Existing cutting inserts tend to fracture at narrow width portions when used in high feed machining under large cutting loads, compromising their performance and tool life.
Innovation Solution
The cutting insert design features a unique configuration with multiple cutting edges and surfaces, including a first surface with varying regions and a second surface with specific inclination angles and widths, which reduces cutting resistance and enhances cutting edge strength, preventing fracture under high load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a narrow-width portion is provided at the corner radius portion to enhance chip discharge performance, then chip discharge performance is improved, but the cutting edge becomes prone to fracture under large cutting loads
Solution Approach 1:
The patent applies local quality by providing different land width configurations at different locations along the cutting edge. Specifically, the land width is reduced at the corner radius portion (narrow-width portion) to improve chip discharge, while the land width is maintained at larger dimensions at the side portions to ensure cutting edge strength and prevent fracture under load. This localized differentiation resolves the contradiction between chip discharge performance and cutting edge strength.
2Ease of operation
If the land width is reduced at the corner radius portion, then chip flow is improved, but the cutting edge becomes vulnerable to fracture under high feed machining conditions
Solution Approach 1:
The patent implements local quality by creating a non-uniform land width distribution along the cutting edge. The narrow-width portion at the corner radius portion facilitates chip flow and discharge, while the wider land portions at the side parts provide structural support and strength to the cutting edge during high feed machining operations with large cutting loads.
3Strength
If a uniform land width is provided along the cutting edge, then cutting edge strength is maintained, but chip discharge performance deteriorates
Solution Approach 1:
The patent resolves this contradiction by abandoning the uniform land width approach and instead implementing a variable land width configuration. The land width is strategically reduced at the corner radius portion to enhance chip discharge performance, while maintaining adequate land width at the side portions to preserve cutting edge strength. This localized differentiation allows both chip discharge performance and cutting edge strength to be optimized simultaneously.
Data Source
AI summary
A cutting insert includes an upper surface and a cutting edge. The upper surface includes a first surface and a second surface which is located further inward than the first surface. The cutting edge includes a first cutting edge and a second cutting edge. The first surface includes a first region along the first cutting edge, a second region adjacent to the first region, and a third region which is adjacent to the second region and along the second cutting edge. The second surface includes a fourth region, a fifth region and a sixth region. A width of the second region is smaller than each of a width of the first region and a width of the third region. An inclination angle of the fifth region is smaller than each of an inclination angle of the fourth region and an inclination angle of the sixth region.