Indexable Cutting Insert Geometry for High-Feed Milling Accuracy
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Solution Overview
Problem
Existing cutting inserts for high-feed milling face issues with increased cutting resistance and poor processing accuracy due to flank interference with the work material, leading to chattering vibrations and chip clogging, especially when the clearance angle of the wiper cutting edge is 0° and the major cutting edge has a negative angle, which necessitates excessive inclination of the tool, compromising cutting quality.
Innovation Solution
A cutting insert with a polygonal plate-shaped insert main body featuring a gradually decreasing clearance angle from the wiper cutting edge to the corner cutting edge, allowing the major cutting edge to maintain a positive angle, reducing flank interference and preventing chip curling, while the minor cutting edge has a stable clearance angle to minimize cutting resistance during high-feed milling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clearance angle of the wiper cutting edge is set to 0° and the major cutting edge has a negative angle, then the cutting insert can be configured for high-feed milling, but the flank interferes with the work material causing increased cutting resistance and poor processing accuracy
Solution Approach 1:
The patent applies local quality by giving different clearance angle characteristics to different regions of the cutting insert. The wiper cutting edge region has a first clearance angle (0° to +15°) optimized for finishing and chip control, while the major cutting edge region has a second clearance angle (+5° to +25°) optimized for aggressive material removal. This localized differentiation allows each cutting edge to perform its specific function optimally without the flank interfering with the work material, thus maintaining both high productivity and manufacturing precision.
2Device complexity
If the flank is convexly curved with negative clearance angle to protrude outward, then the cutting insert structure is simplified, but the flank interferes with the processing surface causing chattering vibrations and chip clogging
Solution Approach 1:
The patent implements local quality by differentiating the flank geometry in different regions. The wiper cutting edge region has a flank with smaller clearance angle (0° to +15°) that provides better chip control and prevents clogging, while the major cutting edge region has a flank with larger clearance angle (+5° to +25°) that prevents flank interference with the work material. This localized differentiation eliminates chattering vibrations and chip clogging while maintaining reasonable structural complexity.
3Object-affected harmful factors
If the rake face is greatly inclined to prevent flank interference, then the clearance angle improves, but the rake angle becomes excessively negative compromising cutting quality
Solution Approach 1:
The patent applies local quality by optimizing the rake face inclination and clearance angles for different cutting edge regions independently. The wiper cutting edge has a first clearance angle (0° to +15°) that provides adequate flank clearance without excessive rake face inclination, while the major cutting edge has a second clearance angle (+5° to +25°) that prevents interference while maintaining proper rake angle. This localized approach eliminates flank interference while preserving cutting quality.
4Device complexity
If the clearance angle gradually decreases to negative angle from wiper to corner cutting edge, then the flank geometry is simplified, but cutting edge strength is compromised at the major cutting edge
Solution Approach 1:
The patent implements local quality by optimizing the clearance angle for each cutting edge region based on its specific functional requirements. The major cutting edge, which requires high strength for aggressive material removal, has a larger second clearance angle (+5° to +25°) that maintains cutting edge strength. The wiper cutting edge, which requires precise chip control, has a smaller first clearance angle (0° to +15°). This localized optimization maintains cutting edge strength while keeping the overall flank geometry relatively simple.
Data Source
AI summary
A cutting insert includes a polygonal plate-shaped insert main body having two polygonal surfaces, a side surface having a flank, and a cutting edge to be formed in an intersection ridgeline portion between a rake face and the flank. The insert main body has a rotationally symmetrical shape with respect to an insert center line, and has a front-rear reversely symmetrical shape with respect to the polygonal surface. The cutting edge includes a corner cutting edge, a major cutting edge extending from an one end of the corner cutting edge, and a wiper cutting edge extending from an one end of the major cutting edge in a direction intersecting the major cutting edge at an obtuse angle. A first region is disposed where a clearance angle of the flank gradually decreases to a negative angle after continuously passing through 0° from a positive angle.