Cutting Tool Pocket Feature for Stress Reduction
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Solution Overview
Problem
Conventional cutting tools experience high stress during machining operations, leading to potential fatigue and tool breakage, with significant tensile stress concentrated near the axial support surface and corner relief, resulting in a low safety factor and increased risk of vibration and noise.
Innovation Solution
Incorporating a pocket feature proximate the radial support surface, such as a round dimple or teardrop recess, to reduce tensile stress and disperse it more evenly, thereby enhancing the safety factor and tool longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pocket design is used, then the structure is simple and easy to manufacture, but the tensile stress is high leading to low safety factor and potential tool breakage
Solution Approach 1:
The patent applies local quality by introducing a pocket feature (such as a rounded corner, fillet, or relief) specifically at the location of maximum tensile stress (the intersection of axial support surface and corner relief). This localized geometric modification redistributes the stress field in the critical area, reducing the peak tensile stress from 742 MPa to significantly lower levels, thereby increasing the safety factor from 0.66 to above 1.0 without requiring a complete redesign of the entire pocket structure.
Solution Approach 2:
The pocket feature is designed in advance during the tool manufacturing process to preemptively address the stress concentration problem. By incorporating the stress-reducing geometric feature before the tool enters service, the design eliminates the need for operational adjustments or repairs and ensures consistent stress distribution throughout the tool's service life.
2Ease of manufacture
If the pocket structure is simplified, then manufacturing is easier, but stress concentration increases leading to vibration and noise
Solution Approach 1:
The solution introduces a localized geometric feature only at the critical stress concentration zone (corner relief area), leaving the rest of the pocket structure simple and easy to manufacture. This targeted approach reduces peak stress and minimizes vibration and noise without complicating the overall manufacturing process.
Solution Approach 2:
The patent modifies the geometric parameters of the pocket feature (such as corner radius, fillet size, or relief depth) to optimize stress distribution. By adjusting these parameters within practical manufacturing limits, the design achieves reduced stress concentration and minimized vibration while maintaining ease of manufacture.
Data Source
AI summary
A cutting tool includes a tool body having a plurality of pockets for receiving cutting inserts. Each pocket includes a bottom support surface, an axial support surface, a radial support surface and a corner relief between the bottom support surface and the axial support surface. A pocket feature is at least partially located proximate the pocket, and more specifically, at least partially located on a wall between the axial support surface and the radial support surface for reducing a tensile stress of the cutting tool during a machining operation.