Milling Insert with Variable Chamfer Width for Cutting Force Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Round single-sided milling inserts with uniform chamfer surfaces face issues with uneven cutting edge wear and excessive cutting forces due to constant clearance angles, leading to reduced service life and poor performance at varying cutting depths.
Innovation Solution
The milling insert features tangentially spaced cutting edges with an arched design, where the chamfer surface width increases along the cutting edge, providing a sharper edge for thin chips and a stronger edge for thick chips, along with a wiper edge for surface finishing, and a broken chamfer surface for reduced cutting forces and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform chamfer surface is used along the entire cutting edge, then the manufacturing process is simple, but the cutting edge experiences uneven wear and excessive cutting forces at varying chip thicknesses
Solution Approach 1:
The chamfer surface is designed with variable width along the cutting edge arc, creating different local geometries: a first chamfer surface section with smaller width for thin chip conditions, and a second chamfer surface section with larger width for thick chip conditions. This local variation optimizes cutting performance and wear resistance at different positions along the cutting edge.
2Device complexity
If a constant clearance angle is maintained along the entire cutting edge, then the insert geometry is simple to manufacture, but cutting forces increase excessively when chip thickness varies
Solution Approach 1:
The clearance angle varies locally along the cutting edge due to the variable width chamfer design. At the first section where chips are thinner, the clearance angle is optimized for reduced cutting forces, while at the second section where chips are thicker, the larger chamfer width provides enhanced edge strength and modified clearance characteristics appropriate for heavy chip removal.
3Force
If the cutting edge is designed to be sharp for thin chips, then cutting forces are reduced for light material removal, but the edge lacks strength for thick chip removal
Solution Approach 1:
The cutting edge is segmented into two distinct chamfer surface sections along its arc length. The first section has a smaller chamfer width creating a sharper edge geometry suitable for light cutting operations with thin chips, while the second section has a larger chamfer width providing a stronger edge for heavy cutting operations with thick chips. This segmentation allows the single cutting edge to handle varying chip thicknesses effectively.
Data Source
AI summary
A milling tool has single sided and indexable milling inserts having a round basic shape. Each milling insert has a plurality of tangentially spaced-apart and alternately usable cutting edges, which individually fall archedly from a first end, situated closest to an upper reference plane, to a lowest point, from which it again rises toward a second end. A reinforcing chamfer surface included in the cutting edge is formed with an increasing width in a direction from the first end of the cutting edge toward the second end.