Asymmetric Cutting Insert Mounting to Prevent Slippage and Misindexing
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Solution Overview
Problem
Existing rotary cutting tools with two upper cutting edges and a lower central protuberance face challenges in providing optimized peripheral shape, radial and axial support, and preventing slippage during milling operations, especially in profiling and copying tasks, where uncut 'center legs' can occur and incorrect assembly is a concern.
Innovation Solution
A cutting insert with non-identical upper cutting edges and a lower central protuberance forming an imaginary irregular quadrilateral with specific internal angles, secured in a rotary cutting tool with insert receiving pockets that provide equivalent radial and axial support, ensuring stable mounting and preventing incorrect indexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the cutting insert has a lower central protuberance with four abutment walls defining an imaginary quadrilateral, then the insert can be secured in the tool body, but the peripheral shape optimization is limited
Solution Approach 1:
The patent applies asymmetry by making the imaginary quadrilateral formed by the four abutment walls non-regular, with specifically defined internal angles (first and third internal angles equal, second and fourth internal angles not equal). This asymmetric configuration optimizes the peripheral shape of the cutting insert while maintaining functional effectiveness in securing the insert to the tool body.
2Adaptability or versatility
If the two cutting inserts have non-identical operative cutting edges, then different cutting functions are achieved, but the mounting position identification becomes complex
Solution Approach 1:
The asymmetric quadrilateral configuration of the abutment walls provides natural positional identification. Since the first and third internal angles are equal while the second and fourth are not, this creates distinct mounting orientations that guide operators to correctly position inserts with non-identical cutting edges, simplifying the mounting process while maintaining functional versatility.
Solution Approach 2:
The cutting tool is divided into two identical tool bodies, each capable of holding inserts with different cutting edge configurations. This segmentation allows the system to achieve versatility through multiple specialized components rather than requiring complex identification mechanisms for each insert type.
3Stability of the object's composition
If the insert receiving pocket provides radial and axial support, then the insert is stable, but slippage prevention is insufficient
Solution Approach 1:
The asymmetric quadrilateral abutment wall configuration creates specific engagement surfaces that prevent slippage in critical directions. The unequal internal angles (second and fourth angles being different) provide directional resistance to slippage forces, enhancing reliability while maintaining stable radial and axial support through the four-wall structure.
Data Source
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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.