Asymmetric Cutting Insert Mounting to Prevent Milling Slippage
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Solution Overview
Problem
Existing cutting tools with two upper cutting edges and a lower central protuberance face challenges in secure mounting and prevention of slippage, particularly in milling operations, due to geometrical constraints that limit the optimization of cutting edge geometry and increase the risk of incorrect assembly.
Innovation Solution
A cutting insert with a lower central protuberance featuring first, second, third, and fourth abutment walls forming an imaginary quadrilateral, which provides enhanced radial and axial support and prevents slippage, allowing for optimized cutting edge geometry and secure mounting without geometrical constraints, and a rotary cutting tool with insert receiving pockets that ensure stable positioning of the cutting inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lower central protuberance with four abutment walls is used, then radial and axial support is enhanced and slippage is prevented, but the geometrical constraints limit the optimization of cutting edge geometry
Solution Approach 1:
The patent applies asymmetry by making the imaginary quadrilateral formed by the four abutment walls non-symmetric, with diagonally opposing internal angles that are not equal. This asymmetric geometry provides sufficient radial and axial support to prevent slippage while creating fewer constraints on cutting edge optimization compared to symmetric designs like squares or rectangles.
2Ease of operation
If the abutment walls form a symmetric quadrilateral, then assembly is simpler, but the cutting edge geometry cannot be optimized and slippage risk increases
Solution Approach 1:
The asymmetric quadrilateral configuration with unequal diagonally opposing angles provides unique geometric features that guide correct assembly orientation while maintaining simplicity. The asymmetry creates natural alignment references that prevent incorrect assembly without requiring complex additional features.
3Productivity
If conventional mounting structures are used, then device complexity is reduced, but cutting edge geometry optimization is limited and performance decreases
Solution Approach 1:
The lower central protuberance with four abutment walls serves multiple functions simultaneously: it provides radial support, provides axial support, prevents slippage, and enables optimized cutting edge geometry. This multi-functional design improves milling operation performance without requiring separate components for each function.
Data Source
AI summary
A cutting insert has opposing upper and lower surfaces interconnected by a peripheral side surface, an insert axis passing through the upper and lower surfaces, and first and second upper cutting edges formed at the intersection of the upper surface and the peripheral side surface. A lower central protuberance having first, second, third and fourth abutment walls extends downwardly from the lower surface. In a cross-section taken in a first horizontal plane perpendicular to the insert axis and intersecting the lower central protuberance, the first, second, third and fourth abutment walls define an imaginary quadrilateral having diagonally opposing first and third internal angles and diagonally opposing second and fourth internal angles. The first and third internal angles are equal to each other, and the second and fourth internal angles are not equal to each other. Two cutting inserts are removably secured in a rotary cutting tool.