Ball End Mill Insert Honing for Chipping-Resistant Finishing
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Solution Overview
Problem
Conventional cutting edge-interchangeable ball end mills face challenges in maintaining precision and preventing chipping during high-efficiency machining of high hardness materials like cast iron, particularly when performing semi-finishing or finishing processes, which affects tool longevity and surface quality.
Innovation Solution
A cutting insert with a plate-shaped design featuring arcuate cutting edges that have a round honing with a curvature radius of 20 to 40 µm and a chisel angle of 150° to 170°, ensuring strength and sharpness while preventing chipping, and a tool with a round honing formed on the cutting edge tips to enhance machining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cutting edges are used for high efficiency machining on high hardness materials, then productivity is improved, but the cutting edge chips and tool life is reduced
Solution Approach 1:
The patent applies different surface treatments to different regions of the cutting edge. A round honing with curvature radius of 0.01 to 0.05 mm is formed on the cutting edge tip (radial angle 30° or less), while the rest of the cutting edge maintains its original geometry. This local modification strengthens the tip region without affecting the overall cutting performance, resolving the contradiction between productivity and cutting edge strength.
Solution Approach 2:
The patent changes the geometric parameters of the cutting edge by forming a round honing with a specific curvature radius (0.01 to 0.05 mm) on the cutting edge tip. This parameter change strengthens the cutting edge tip, preventing chipping during high efficiency machining on high hardness materials while maintaining the required productivity.
2Productivity
If conventional cutting edges are used for high efficiency machining on high hardness materials, then productivity is improved, but manufacturing precision is reduced due to chipping
Solution Approach 1:
The round honing is applied locally to the cutting edge tip region (radial angle 30° or less), which is the area most susceptible to chipping during intermittent machining. This local strengthening prevents chipping that would otherwise degrade surface quality, while maintaining high productivity through the overall cutting edge geometry.
3Manufacturing precision
If the cutting edge tip is made sharper for better surface finish, then manufacturing precision is improved, but the cutting edge becomes more prone to chipping
Solution Approach 1:
The round honing creates a localized strengthening effect at the cutting edge tip without significantly altering the overall sharpness of the cutting edge. The curvature radius of 0.01 to 0.05 mm is small enough to maintain surface finish quality while large enough to prevent chipping, resolving the contradiction between sharpness and strength.
Data Source
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AI summary
This cutting insert has: as cutting edges, arcuate cutting edges that are of an arc shape protruding toward an outer circumference side of a distal end. A chisel part is formed at an intersecting ridge line part between the flank faces of the pair of arcuate cutting edges. A round honing is formed on the cutting edge tip of the arcuate cutting edge at least in a range where a radial angle is 30° or less. A curvature radius of the round honing in a cross section perpendicular to the edge length direction of the arcuate cutting edge is 20 to 40 µm. A chisel angle formed between the distal end part of the arcuate cutting edge and a chisel edge of the chisel part is 150° to 170° as seen in an insert front view.