Variable Chamfer Milling Insert for Wear Control
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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 geometry and clearance angles, leading to reduced service life and surface finish quality.
Innovation Solution
The milling insert features tangentially spaced cutting edges with an arched design and varying chamfer surface width, optimizing cutting edge geometry for chip thickness and depth, incorporating a wiper edge for surface finishing and reducing cutting forces through adaptive clearance and rake angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform chamfer surface is used along the entire periphery of the milling insert, then the manufacturing process is simplified, but the cutting edge strength becomes insufficient for varying chip thickness and the cutting forces become excessively large
Solution Approach 1:
The chamfer surface is designed with variable width instead of uniform width. The width of the chamfer surface varies along the cutting edge to provide optimal cutting edge strength at different locations. This allows the cutting edge to have enhanced strength where needed (particularly in regions experiencing higher chip thickness and cutting forces) while maintaining ease of manufacture through a systematic gradient design.
2Device complexity
If a constant nominal clearance angle is used along the entire circumferential clearance surface, then the insert geometry is simplified, but the functional clearance angles vary with cutting depth causing local temperature rises and reduced service life
Solution Approach 1:
The nominal clearance angle is varied along the circumferential clearance surface to compensate for variations in functional clearance angles caused by different cutting depths. By adjusting the nominal clearance angle at different angular positions, the design ensures more uniform functional clearance angles across varying chip thicknesses, preventing local temperature rises and extending insert service life.
3Productivity
If the cutting edge geometry is optimized for small cutting depths, then the insert performs well for light milling, but the cutting edge becomes too weak for large cutting depths and thick chips
Solution Approach 1:
The cutting edge geometry is made adaptive through the variable width chamfer surface design. The chamfer width varies along the cutting edge to provide dynamic optimization: narrower chamfer sections provide sharp, efficient cutting edges for light milling applications, while wider chamfer sections provide enhanced strength and support for heavy milling with thick chips. This dynamic geometric variation allows a single insert to handle a wide range of cutting depths effectively.
Data Source
AI summary
The invention relates to a milling tool that is equipped with single sided and indexable milling inserts having a round basic shape. Characteristic of said milling insert (2) is that the same comprises a plurality of tangentially spaced-apart and alternately usable cutting edges (12), which individually fall archedly from a first end (20), situated closest to an upper reference plane, to a lowest point, from which it again rises toward a second end (21), a reinforcing chamfer surface (22) included in the cutting edge being formed with an increasing width in the direction from the first end (20) of the cutting edge toward the second end (21).