Indexable Tool Holder Seat Geometry for Stress Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In indexable cutting tool holders, stress from cutting loads is concentrated on relief portions, potentially damaging the holder main body due to minimal inclination angles aimed at increasing rigidity, which can lead to unstable cutting operations and chip discharge issues.
Innovation Solution
Increasing the inclination angle of the inclined face within a predetermined range (20° to 50°) disperses stress across the insert mounting seat, preventing concentration on relief portions and enhancing rigidity, thereby stabilizing cutting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inclination angle of the inclined face is minimized to increase rigidity of the holder main body, then the rigidity is improved, but stress concentration occurs on the relief portion leading to potential damage
Solution Approach 1:
The patent changes the inclination angle parameter of the inclined face from a minimal angle (0° in related art) to a specific range (5° to 15°). This parameter modification allows the inclined face to receive cutting loads while dispersing stress away from the relief portion, thereby maintaining rigidity without causing stress concentration that would lead to damage.
2Object-affected harmful factors
If the inclination angle of the inclined face is increased to disperse stress, then stress concentration is reduced, but the wall thickness decreases reducing rigidity
Solution Approach 1:
The patent identifies an optimal range for the inclination angle (5° to 15°) that balances two opposing requirements: dispersing stress to prevent concentration on the relief portion while maintaining sufficient wall thickness for rigidity. This parameter optimization resolves the contradiction by finding the sweet spot where both stress dispersion and structural strength are satisfied.
Data Source
AI summary
A mounting seat bottom surface facing a holder rotation direction; a first mounting seat wall surface (3b) facing an outer peripheral side of the holder main body (1), and a first relief portion (3d) on a corner portion where they intersect, are formed on an outer peripheral portion of a tip of a holder main body (1) rotated in a direction around an axis, on the inner peripheral side of the first mounting seat wall surface (3b), an inclined face (6) is formed in a range from an end edge (3b1) of the first mounting seat wall surface (3b) to 2 mm or less in the inner peripheral side, and the inclined face (6) being retracted toward the posterior end side in the axial direction as being extended toward the inner peripheral side, and an inclination angle θ is 20° or more and 50° or less.