Segmented Coupling Pin for Rotary Cutting Tool
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Solution Overview
Problem
The production of coupling pins for rotary cutting tools with dovetail-shaped configurations is complex and prone to high stress concentration due to acute angles, particularly in the region of stop surfaces, making it challenging to achieve a simple and effective self-clamping, reversibly releasable coupling that can absorb high forces.
Innovation Solution
A coupling pin design with distinct axially offset regions for stop and clamping surfaces, allowing for individual optimization of each functional surface and neutralizing the critical transition region with inclined surfaces, enabling self-centering and self-clamping without additional fastening elements, and facilitating simpler production by decoupling functional surfaces along the longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dovetail-shaped configuration of the coupling pin is used to achieve self-clamping and axial pull-out protection, then the coupling reliability is improved, but the manufacturing complexity increases and stress concentration occurs at acute angles
Solution Approach 1:
The coupling pin is divided into two distinct pin regions: a front pin region with a rectangular cross-section for simplified manufacturing, and a rear pin region with dovetail-shaped configuration for self-clamping. This segmentation allows each region to be optimized for its specific function while reducing overall manufacturing complexity
Solution Approach 2:
The dovetail-shaped configuration is applied locally only to the rear pin region where self-clamping is required, while the front pin region maintains a simple rectangular cross-section. This localized application of complexity reduces manufacturing difficulty while maintaining coupling reliability
2Reliability
If the coupling pin has a dovetail-shaped configuration with acute angles, then self-clamping is achieved, but stress concentration forces increase in the region of stop surfaces
Solution Approach 1:
By separating the coupling pin into front and rear regions with different geometries, the stress concentration problem is isolated to the rear pin region where the dovetail configuration is necessary for self-clamping, while the front pin region maintains uniform stress distribution
Solution Approach 2:
The acute-angled dovetail configuration is confined to the rear pin region where self-clamping is needed, while the front pin region uses a rectangular cross-section that avoids stress concentration, allowing each region to have the quality appropriate for its function
3Adaptability or versatility
If the coupling pin integrates both stop surfaces and clamping surfaces in a single configuration, then the coupling function is complete, but the manufacturing outlay increases
Solution Approach 1:
The coupling pin is segmented into a front pin region with stop surfaces and a rear pin region with clamping surfaces. This segmentation allows each region to be manufactured independently with simpler processes, reducing overall manufacturing outlay while maintaining complete coupling functionality
Solution Approach 2:
The coupling pin achieves multi-functionality by integrating both stop surface and clamping surface functions into a single component, with the front region providing stop functionality and the rear region providing self-clamping functionality, eliminating the need for separate fastening elements
Data Source
AI summary
The coupling part, in particular cutting head for a drilling tool for the interchangeable fastening in a coupling receptacle, has a coupling pin which is enclosed by a head support surface, wherein the coupling pin has a plurality of types of functional surfaces, namely stop surfaces for transmitting a torque between the cutting head and the carrier, and clamping surfaces for centering and clamping the cutting head in the coupling receptacle. The coupling pin has an axially front pin region and an adjoining, axially rear pin region, and the clamping surfaces and the stop surfaces are arranged in different pin regions. This decoupling and distribution of the functional surfaces to the various pin regions permits simpler production of the coupling pin and an overall more robust configuration.