Rotatable Tool Centering Pin Asymmetry
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Solution Overview
Problem
Existing rotatable tools with loose tops face challenges in achieving precise centering and easy mounting without risk of incorrect positioning, requiring high manufacturing precision and often resulting in difficult mounting and dismounting due to the need for significant force.
Innovation Solution
The design incorporates a centering pin with diametrically opposed external surfaces, where the contact surface is pressed against a cylindrical support surface in the center hole, ensuring the pin can only be inserted correctly, and a radial screw for simple axial locking, allowing foolproof mounting and dismounting while maintaining high accuracy and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a centering pin with close fit is used to ensure precise centering, then manufacturing precision is improved, but mounting and dismounting become difficult requiring great force
Solution Approach 1:
The centering pin is designed with asymmetric cross-section featuring a flat side and a rounded side, while the center hole contains a corresponding flat bottom surface. This asymmetric geometry enables precise positioning and centering of the loose top relative to the basic body, while the flat contact surfaces provide adequate clearance for easy insertion and removal during mounting and dismounting operations
Solution Approach 2:
A flat bottom surface is introduced as an intermediary element within the center hole, providing a dedicated contact surface for the centering pin. This intermediary flat surface enables precise centering through form-fitting contact while maintaining clearance for easy mounting and dismounting, resolving the contradiction between precision and ease of operation
2Manufacturing precision
If high manufacturing precision is required for centering, then centering accuracy is improved, but device complexity increases
Solution Approach 1:
The centering pin features an asymmetric cross-section with a flat side and rounded side, and the center hole contains a corresponding flat bottom surface. This asymmetric design achieves high centering accuracy through simple geometric form-fitting rather than complex adjustment mechanisms, thereby improving centering accuracy while minimizing device complexity
Solution Approach 2:
The asymmetric geometry of the centering pin and flat bottom surface in the center hole create a self-centering mechanism. The form-fitting contact between the flat surfaces automatically positions the loose top correctly relative to the basic body without requiring complex adjustment devices or high-precision manufacturing of multiple surfaces, thus achieving high centering accuracy with simple structure
Data Source
AI summary
A rotatable tool for chip removing machining, including a basic body having front and rear ends between which there extends a first geometrical center axis, and a loose top having front and rear ends between which a second geometrical center axis extends. The front end of the basic body includes a jaw, which is delimited by two drivers and an intermediate bottom and in which a part of the loose top is received. A centering pin protrudes axially rearward from the loose top and is inserted in an axial center hole, which mouths in the bottom of the jaw and in which a threaded hole mouths for a screw co-operating with the center pin. The center hole includes a cylindrical support surface, which is concentric with the center axis of the basic body and against which the centering pin of the loose top is pressed by the screw.