Rotatable Groove Cutting Tool With Split Radial Cutting Edges
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Solution Overview
Problem
Existing rotatable tools for forming circular grooves, such as seal ring grooves, often suffer from insufficient geometrical accuracy and increased pressure on cutting inserts due to varying chip thickness, leading to reduced tool life and increased costs.
Innovation Solution
A rotatable tool with two cutting edges, a radially outer cutting edge and a radially inner cutting edge, positioned at distinct radial distances from the tool center axis, where the radially outer cutting edge generates the outer wall surface and the radially inner cutting edge generates the inner wall surface, reducing the impact of tool tolerances on dimensional accuracy and allowing for improved chip removal and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotatable tool with two opposite cutting inserts is used to machine circular grooves, then productivity is improved through simultaneous cutting of inner and outer walls, but manufacturing precision deteriorates due to insufficient geometrical accuracy of the groove walls
Solution Approach 1:
The tool is divided into two separate cutting inserts, each with dedicated cutting edges for specific surfaces. The first insert has a first cutting edge for the inner wall surface and a second cutting edge for the outer wall surface, while the second insert has corresponding edges. This segmentation allows each cutting edge to be optimized for its specific function, improving geometrical accuracy while maintaining productivity through simultaneous cutting.
Solution Approach 2:
Different cutting edges are positioned at different radial distances from the tool center axis. The radially outer cutting edge is positioned at a larger radial distance than any other cutting edge, while the radially inner cutting edge is positioned at a smaller radial distance. This local quality differentiation ensures that each cutting edge generates the correct surface geometry with appropriate tolerances.
2Productivity
If cutting inserts are used to remove material efficiently, then productivity is improved, but reliability deteriorates due to increased pressure and load on inserts leading to reduced tool life
Solution Approach 1:
The cutting function is segmented across two separate inserts, distributing the cutting load. Each insert carries only specific cutting edges for specific surfaces, reducing the cumulative load on each individual cutting edge compared to a single insert design, thereby extending tool life while maintaining high material removal rates.
Solution Approach 2:
The radial positioning of cutting edges is changed to create distinct radially outer and radially inner cutting edges. This parameter change optimizes the chip thickness distribution and cutting forces, reducing peak loads on individual cutting edges and improving tool life while maintaining efficient material removal.
Data Source
AI summary
A rotatable tool for producing a circular groove through metal cutting in a metal work piece and a method of forming the circular groove with the rotatable tool is disclosed. The rotatable tool includes a front end and a second end. The front end includes a first radially outer cutting edge and a second radially inner cutting edge, where the first radially outer cutting edge is located at a larger radial distance from the tool center axis than any other cutting edge of the rotatable tool, and where the second radially inner cutting edge is located at a smaller radial distance from the tool center axis than any other cutting edge of the rotatable tool.