Three-Nose Turning Insert for Chip Control in Radial Turning
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Solution Overview
Problem
Existing turning inserts, such as TNMG or TCMT, face challenges in radial turning, particularly in out-facing operations, where poor chip control leads to inefficiencies and surface finish issues.
Innovation Solution
A turning insert with three nose portions, featuring a unique configuration of cutting edges and a convex nose cutting edge, along with rotation prevention means on the bottom surface, enhances chip breaking and control during machining of external 90° corners at entering angles between 10° and 45°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common turning inserts (TNMG or TCMT) are used for radial turning and out-facing operations, then the insert can be used for a wide range of feed directions, but chip control is poor leading to inefficiencies and surface finish issues
Solution Approach 1:
The cutting insert is divided into three separate nose portions (first, second, and third nose portions) arranged symmetrically around the center axis. Each nose portion has specific cutting edges designed for particular operations. This segmentation allows different nose portions to be optimized for different feed directions, with the third nose portion specifically designed for out-facing operations to improve chip control while maintaining versatility across multiple feed directions.
Solution Approach 2:
Different nose portions have different geometric configurations tailored to specific machining operations. The third nose portion includes a third cutting edge and third sub-cutting edges with specific orientations optimized for out-facing operations. This local quality differentiation ensures that each nose portion provides optimal chip control for its intended operation, resolving the contradiction between versatility and chip control.
2Adaptability or versatility
If the turning insert uses a symmetric triangular shape with 60° nose angle, then the insert can handle various feed directions, but chip breaking is insufficient at entering angles between 10° and 45°
Solution Approach 1:
While the overall insert maintains symmetric arrangement of three nose portions for versatility, each individual nose portion introduces asymmetric elements. The third nose portion specifically has asymmetric cutting edge configurations (third cutting edge and third sub-cutting edges) that create effective chip breaking geometry for entering angles between 10° and 45°. This controlled asymmetry within the symmetric framework resolves the contradiction between versatility and chip breaking performance.
Solution Approach 2:
Instead of relying on the traditional first and second nose portions for all operations, the invention introduces a third nose portion that inverts the approach by providing dedicated cutting edges optimized for out-facing and specific entering angles. This inversion of the conventional two-nose-portion design enables effective chip breaking where traditional designs fail, while maintaining overall versatility through the three-nose-portion symmetric arrangement.
3Manufacturing precision
If the cutting edges are designed for optimal performance at specific entering angles, then chip breaking improves, but the insert complexity increases
Solution Approach 1:
The three nose portions are arranged symmetrically around the center axis, with each nose portion being identical in geometry. This multi-functionality allows any of the three nose portions to be positioned for use, providing universal coverage for different feed directions and entering angles. The symmetric repetition of the same geometry three times achieves versatility without requiring three different complex designs, thus managing insert complexity while maintaining chip breaking effectiveness.
Solution Approach 2:
The invention merges the functions of multiple cutting edges into a unified three-nose-portion structure. The first, second, and third nose portions each contribute specific cutting edges that can be activated depending on the operation. By combining these functions into a single symmetric arrangement, the design achieves effective chip breaking across different entering angles without requiring separate inserts for each operation, thereby managing complexity through functional integration.
Data Source
AI summary
A turning insert includes a top surface, a bottom surface, and side surfaces connecting the top and bottom surfaces. A reference plane is located parallel to and between the top surface and the bottom surface. A center axis intersects and extends perpendicular to the reference plane. Three nose portions are formed symmetrically around the center axis. Each nose portion has a first cutting edge, a second cutting edge and a convex nose cutting edge connecting the first and second cutting edges. As seen in in a top view, the first and second cutting edges on the same nose portion form a nose angle of 25-50°. The first cutting edge includes a first sub-portion and a second sub-portion. A distance from the nose cutting edge to the first sub-portion is shorter than a distance from the nose cutting edge to the second sub-portion.