Throw-Away Rotating Tool Protrusion Alignment
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Solution Overview
Problem
The existing throw-away rotating tools require stringent dimension control and high machining accuracy for the engaging components, making them difficult to manufacture efficiently and resulting in insufficient workability for attachment and detachment of the cutting head due to the need for significant force to overcome frictional forces.
Innovation Solution
The tool design incorporates erected portions with protrusions that are pushed into inner peripheral walls, allowing for misalignment regulation and reduced dimension control requirements, enabling easier attachment and detachment with lower force requirements by adjusting contact areas during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the projecting coupling portion is brought into firm contact with the recessed portion through strict dimension control, then the misalignment regulation is improved, but the manufacturing complexity and time increase
Solution Approach 1:
The inner peripheral surface of the recessed portion is segmented into multiple inclined surfaces with different inclination angles. This segmentation allows each surface to engage with the outer peripheral surface of the projecting coupling portion at different stages, providing misalignment regulation without requiring strict dimension control across the entire interface, thereby improving manufacturing efficiency.
Solution Approach 2:
Different portions of the inner peripheral surface are given different local properties through varying inclination angles. The first inclined surface has a smaller inclination angle for initial engagement and alignment, while the second inclined surface has a larger inclination angle for final securing. This local differentiation enables effective misalignment regulation without stringent dimension control requirements.
2Strength
If the entire outer peripheral surface of the projecting coupling portion is brought into firm contact with the recessed portion, then the engagement strength is improved, but the force required for attachment and detachment increases
Solution Approach 1:
The engagement interface transitions from a static full-contact design to a dynamic progressive engagement. During attachment, the inclined surfaces progressively engage the projecting coupling portion, allowing it to be pushed in with moderate force. During detachment, the inclined surfaces progressively disengage, reducing the force required compared to overcoming static friction across the entire contact surface.
Solution Approach 2:
The contact interface is segmented into multiple inclined surfaces rather than a single continuous contact surface. This segmentation reduces the total contact area at any given moment during attachment and detachment operations, thereby reducing the frictional force that must be overcome while still providing sufficient engagement strength when fully assembled.
Data Source
AI summary
A throw-away rotating tool includes plural protrusions formed in a part of an outer peripheral wall of a projecting coupling portion. Since the twist angle and a twist direction of the protrusions are set in such a way that with relative rotation when coupling the projecting coupling portion and erected portions together, due to the reaction force received by the protrusions from inner peripheral walls, the projecting coupling portion is pulled to the rear and side of the erected portions and the projecting coupling portion is stably held between the erected portions. Since the number of portions that require stringent dimension control and high machining accuracy can be reduced, productivity can be improved.