Milling Head Through-Hole Lobes for Centering and Torque Transfer
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Solution Overview
Problem
Existing rotary milling tools face challenges in achieving a compact and efficient engagement between the milling head and tool holder, particularly in terms of torque transfer and radial alignment, which affects the tool's stability and performance during operations.
Innovation Solution
The design incorporates a milling head with a non-cylindrical through recess featuring angularly spaced tooth-receiving lobes and a tool holder with centering drive teeth, allowing for direct abutment of driven and radial centering surfaces for enhanced torque transfer and alignment, along with fastening through holes for secure attachment, enabling a compact and stable assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cylindrical through hole is used for radial centering, then the structure is simple, but torque transfer efficiency is insufficient
Solution Approach 1:
The through hole is segmented into multiple functional surfaces: radial centering surfaces for alignment and driven surfaces for torque transfer. This segmentation allows each surface to be optimized for its specific function, resolving the contradiction between structural simplicity and torque transfer efficiency.
Solution Approach 2:
Different local regions of the through hole are given different geometric properties. The radial centering surfaces have specific orientations for precise alignment, while the driven surfaces are positioned and shaped to maximize torque transfer. This local differentiation enables both simple overall structure and high torque transfer efficiency.
2Power
If a keyway is added for torque transfer, then torque transfer efficiency improves, but device complexity increases
Solution Approach 1:
The torque transfer function is merged with the centering hole structure itself. Instead of adding a separate keyway, the driven surfaces are integrated into the through hole, allowing torque transfer and radial centering to be achieved through a unified structure. This eliminates the need for additional keyway features while maintaining torque transfer efficiency.
Solution Approach 2:
The through hole serves multiple functions simultaneously: radial centering through the radial centering surfaces and torque transfer through the driven surfaces. This multi-functionality eliminates the need for separate keyway structures, reducing device complexity while maintaining effective torque transfer.
3Device complexity
If driven surfaces and radial centering surfaces are at the same radial position, then the structure is compact, but alignment precision deteriorates
Solution Approach 1:
The surfaces are differentiated in the angular dimension rather than being positioned at different radial distances. The radial centering surfaces and driven surfaces are arranged at different angular positions around the through hole, allowing both functions to be performed effectively while maintaining structural compactness and achieving precise radial alignment.
4Reliability
If the milling head is tightly secured to the tool holder, then operational stability improves, but the assembly becomes less adaptable for quick changes
Solution Approach 1:
The radial centering surfaces perform preliminary alignment action before the final tightening. By pre-aligning the milling head with the tool holder through the radial centering surfaces, the subsequent tightening process becomes simpler and faster, enabling both operational stability and quick change capability.
Data Source
AI summary
A rotary milling tool has a tool holder and a milling head releasably attached thereto. The milling head has a head through recess opening out to the head forward and rearward surfaces. The recess includes a plurality of radially extending tooth-receiving lobes. The tool holder has a projection which includes a plurality of radially extending teeth. When assembled the teeth are located in the tooth-receiving lobes and provide centering and torque transfer capabilities.