Segmented Cutting Insert Geometry for Chip Curling and Flat Surfaces
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Solution Overview
Problem
Conventional cutting inserts used in groove-forming create steps on workpiece surfaces, reducing machining efficiency due to their circular arcuate and convex design, which affects chip processability.
Innovation Solution
A cutting insert with a first surface featuring a first inclined surface and convex projections, where the inclination angles of different regions control chip flow, allowing for improved chip deformation and reduced contact with machined surfaces, enabling high chip processability and machining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the front cutting edge is circular arcuate and convex to improve chip squeezing action, then chip processability is improved, but a step is formed on the workpiece surface requiring separate machining
Solution Approach 1:
The cutting insert is divided into multiple functional regions: a first region with a convex front cutting edge for chip squeezing, a second region with a linear cutting edge for flat surface machining, and a third region with an inclined cutting edge for transition. This segmentation allows each region to perform its specific function optimally without compromising overall performance
Solution Approach 2:
Different portions of the cutting insert are given different geometric properties tailored to their specific functions. The front portion has convex curvature for chip deformation, the middle portion has linear geometry for flat surface generation, and the rear portion has inclined geometry for smooth transition. This local differentiation resolves the contradiction between chip processability and surface flatness
2Manufacturing precision
If separate machining is performed to obtain a flat machined surface, then surface accuracy is improved, but machining efficiency is reduced
Solution Approach 1:
The invention merges chip squeezing action and flat surface machining into a single cutting operation. The multi-region cutting edge design allows the convex front region to deform chips while the linear middle region simultaneously generates a flat surface, eliminating the need for separate machining operations and maintaining high machining efficiency
Solution Approach 2:
The cutting insert is designed with multi-functionality, where a single tool performs both chip deformation and flat surface machining. The different regions of the cutting edge serve multiple purposes: chip squeezing, surface generation, and transition, making the tool universal and eliminating the need for multiple specialized tools or operations
3Ease of manufacture
If the first inclined surface has a large inclination angle to improve chip deformation, then chip processability is improved, but chips may contact the machined surface causing defects
Solution Approach 1:
The inclination angle of the first inclined surface is dynamically adjusted along the cutting edge, transitioning from a larger angle at the front for effective chip deformation to a smaller angle toward the rear to prevent chip contact with the machined surface. This dynamic variation optimizes both chip processability and surface quality
Solution Approach 2:
The cutting insert geometry is designed in advance to control chip flow paths. The progressive change in inclination angles and the presence of the linear cutting edge region are pre-configured to guide chips away from the machined surface before they can cause defects, preventing rather than correcting potential problems
Data Source
AI summary
A cutting insert according includes a first surface and a cutting edge. The first surface includes a first inclined surface and a projection. The first inclined surface includes a first region located close to a first corner portion, a second region located close to a second corner portion, and a third region located between the first region and the second region. The projection includes a first projection located close to the first corner portion and a second projection located close to the second corner portion. A first top portion of the first projection is located closer to the first corner portion than a first boundary portion between the first region and the third region, and a second top portion of the second projection is located closer to the second corner portion than a second boundary portion between the second region and the third region.