Reversible Milling Insert Geometry for Chip Evacuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing square shoulder milling inserts face challenges in chip control, particularly at large and small cutting depths, with raised circumferential cutting edges risking chip entrapment and increased cutting forces.
Innovation Solution
A reversible cutting insert with a truncated equilateral triangle-shaped circumferential cutting edge, featuring a first cutting edge portion that intersects a support plane, providing improved chip evacuation and reduced cutting forces through a sloping design that prevents chip entrapment and optimizes wear distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the circumferential cutting edge is entirely raised in relation to the first flat surface, then the cutting insert provides robustness and stability, but chips are trapped inside the raised cutting edge leading to poor chip evacuation
Solution Approach 1:
The circumferential cutting edge is segmented into three cutting edge portions (first, second, third) arranged at 120-degree intervals. Each portion is independently configured with specific geometry, allowing optimized chip flow paths while maintaining structural robustness. The segmentation enables chips to be directed along defined evacuation paths rather than being trapped in a continuous raised structure.
Solution Approach 2:
The first cutting edge portion is designed to be longer than the third cutting edge portion, creating an asymmetric configuration. This asymmetry optimizes chip evacuation by providing longer cutting action in critical areas while maintaining sufficient clearance and robustness in other areas, preventing chip entrapment without sacrificing overall strength.
2Device complexity
If the first cutting edge portion is parallel to the median plane, then the structure is simpler, but cutting forces increase and chip control deteriorates
Solution Approach 1:
The first cutting edge portion is configured to slope towards the median plane, introducing a dimensional change from a parallel arrangement to an inclined arrangement. This sloping geometry reduces cutting forces by optimizing the chip flow direction and contact area, while also improving chip control through better chip deflection along the sloped surface.
3Shape
If the second cutting edge portion is raised relatively great distance in relation to the first support plane, then the first cutting edge portion can achieve sufficient sloping angle without intersecting the support plane, but powder compaction becomes uneven increasing crack risk
Solution Approach 1:
The cutting edge portions are configured with different local geometries and elevations. The first cutting edge portion intersects the first support plane at a controlled location, while the second cutting edge portion is raised to provide the necessary sloping angle. This localized differentiation allows each portion to fulfill its specific function (chip evacuation, cutting action, structural support) without causing uneven powder compaction across the entire insert, thereby reducing crack risk.
Data Source
AI summary
A reversible cutting insert for milling including opposing and identically or substantially identically top and bottom surfaces interconnected by a continuous peripheral side surface, with a median plane located between the top and bottom surfaces and intersecting the side surface, and an insert axis perpendicular to the median plane about which the cutting insert is indexable. Each top and bottom surface is limited by a circumferential cutting edge intersecting the side surface, the circumferential cutting edge in a top view having the shape of a truncated equilateral triangle. Each circumferential cutting edge includes three analogous sets of cutting edges exhibiting three-fold rotational symmetry about the insert axis. A first cutting edge portion intersects a first support plane.