Reversible Square Cutting Insert for Stable Shoulder Milling
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Solution Overview
Problem
Existing rotatable cutting tools for milling operations lack stability and robustness, particularly in reversible cutting inserts with four major cutting edges, and often have limited circumferential spacing of cutting inserts around the tool body, which affects their performance in square shoulder milling operations.
Innovation Solution
A reversible cutting insert design featuring opposing top and bottom end surfaces with a continuous peripheral surface, including four side surfaces and corner surfaces, where the top major cutting edges define an imaginary square offset from a median square, providing robust cutting edges and increased stability through dove-tail clamping and optimized relief angles, and a cutting tool with multiple inserts circumferentially spaced around the tool body for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional cutting insert designs are used, then manufacturing simplicity is maintained, but cutting edge robustness and stability are insufficient
Solution Approach 1:
The cutting insert is divided into distinct functional surfaces: four side surfaces, four corner surfaces, top and bottom end surfaces. Each surface is optimized independently with specific relief angles and geometries to enhance cutting edge robustness while maintaining overall structural coherence
Solution Approach 2:
Different surfaces of the cutting insert are given different local geometries and relief angles tailored to their specific functions. The side surfaces have optimized relief angles for lateral stability, corner surfaces for corner cutting performance, and top/bottom surfaces for clamping stability, ensuring each region contributes optimally to overall robustness
2Stability of the object's composition
If cutting inserts are closely spaced circumferentially, then tool body compactness is achieved, but clamping stability and cutting performance deteriorate
Solution Approach 1:
The cutting insert geometry is optimized in multiple dimensions: the rotational offset of the imaginary square relative to the median square creates optimal spacing relationships in the circumferential direction, while the vertical relief angles provide stability in the axial dimension, allowing increased circumferential spacing without compromising tool compactness
3Productivity
If reversible cutting inserts with four major cutting edges are used, then productivity is improved, but stability and robustness are reduced
Solution Approach 1:
The cutting insert employs asymmetric geometry where the imaginary square defined by the four major cutting edges is rotationally offset from the median square. This asymmetric configuration optimizes the distribution of cutting edges while maintaining enhanced stability through carefully designed relief surfaces and angles on each side and corner
Data Source
AI summary
In a cutting tool rotatable about a tool axis, a reversible cutting insert is removably secured in a tool body. The cutting insert has opposing top and bottom end surfaces interconnected by a peripheral surface, and a median plane located therebetween. The peripheral surface includes four side surfaces alternating with four corner surfaces, the side and corner surfaces intersecting the top surface to form top major cutting edges and top corner cutting edges, respectively. Each side surface has a median surface and a top major relief surface. Each top major relief surface forms an acute internal top major relief angle with the median plane, and the median plane intersects the four median surfaces to define an imaginary median square. In a top end view of the cutting insert, the four top major cutting edges define an imaginary top major square rotationally offset from the imaginary median square.