High-Feed Milling Insert Geometry for Chip-Wedging-Free Ramping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting inserts for high-feed milling face challenges in ramping operations, including pocketing, due to chip wedging issues between the workpiece and the milling tool's peripheral relief surface, leading to inefficiencies and increased risk of tool damage.
Innovation Solution
A cutting insert design with specific geometric features, including obtuse-angled main and ramping cutting edges, sloping corner cutting edges, and chip breakers, which facilitate smooth chip movement and reduce the risk of chip wedging by ensuring chips move radially outward, away from the active cutting edges, thereby enhancing the cutting process and chip evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cutting insert designs are used in ramping operations, then the cutting process can proceed, but chip wedging occurs between the workpiece and the peripheral relief surface, leading to tool damage and reduced efficiency
Solution Approach 1:
The cutting edges are designed with three-dimensional spatial configuration where the main cutting edge and ramping cutting edge are positioned at different radial distances from the center axis. The main cutting edge has its second end closer to the median plane than the ramping cutting edge's second end, creating a stepped arrangement that directs chips radially outward in a controlled path away from the peripheral relief surface, eliminating chip wedging.
Solution Approach 2:
The patent specifies precise geometric parameters including obtuse angles between main and ramping cutting edges (95°-160°, preferably 112°±5°), and controlled sloping of cutting edges toward the median plane. These parameter changes optimize chip flow direction and prevent chip accumulation that would otherwise cause wedging between the workpiece and tool.
2Productivity
If traditional cutting edge configurations are used, then the tool structure remains simple, but chip evacuation is inefficient and cutting process becomes aggressive
Solution Approach 1:
The cutting insert is divided into multiple functional cutting edges: main cutting edge for primary material removal, ramping cutting edge for controlled entry, corner cutting edges for cornering operations, and secondary cutting edges for surface finishing. Each segment performs a specific function that collectively improves chip evacuation and reduces aggressive cutting.
Solution Approach 2:
The cutting edges are arranged in a three-dimensional configuration where different edges operate at different radial positions and angular orientations. The main cutting edge and ramping cutting edge are positioned at different distances from the median plane, creating a stepped arrangement that facilitates smooth chip flow and evacuation while maintaining tool structural integrity.
Data Source
AI summary
A cutting insert for use in high-feed milling has a 180° rotational symmetry about a center axis and includes first and second major faces, a median plane extending between said major faces perpendicularly to the centre axis, a first main cutting edge and an associated first ramping cutting edge, and a second main cutting edge and an associated second ramping cutting edge. Each main cutting edge has a first end facing the associated ramping cutting edge and an opposite second end. Each ramping cutting edge has a first end facing the associated main cutting edge and an opposite second end. The cutting edges slope such that their second ends are located closer to the median plane than the respective first ends, and the second ends of the main cutting edges, are located closer to the median plane than the second ends of the ramping cutting edges.