Rotary Tool Head Serration for Torque and Centering
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Solution Overview
Problem
Existing rotary tools face challenges in achieving precise centering and effective torque transmission between the tool head and the carrier shank, which are critical for high-precision machining applications like reaming.
Innovation Solution
The tool head features a serration design on its coupling surface with multiple parallel grooves and ribs, forming part-serrations oriented at an angle, which provides enhanced self-centering and torque transmission by increasing the coupling surface area and allowing for precise alignment with the carrier shank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a planar coupling surface is used between the tool head and carrier shank, then the device structure is simple, but the torque transmission is insufficient and centering precision is poor
Solution Approach 1:
The coupling surface is segmented into multiple parallel grooves and ribs, creating a serrated structure. This segmentation increases the effective contact area and provides multiple load paths for torque transmission, resolving the contradiction between simple structure and sufficient torque transmission capability.
Solution Approach 2:
The coupling surface transitions from a two-dimensional planar surface to a three-dimensional serrated structure with grooves and ribs. This dimensional enhancement provides both increased torque transmission through the serration geometry and improved centering through the angular orientation of part-serrations, while maintaining reasonable structural complexity.
2Manufacturing precision
If a standard coupling surface is used, then the manufacturing process is simple, but the centering precision of the tool head is insufficient
Solution Approach 1:
The part-serrations are oriented at specific angles relative to each other, creating an asymmetric pattern that provides self-centering functionality. This asymmetric geometry guides the tool head into precise alignment with the carrier shank during assembly, achieving high centering precision while the manufacturing process remains relatively straightforward using standard machining operations.
3Strength
If the coupling surface area is increased to improve torque transmission, then the torque capacity improves, but the device complexity increases
Solution Approach 1:
Instead of simply enlarging a planar coupling surface, the invention segments the existing surface area into multiple grooves and ribs. This segmentation effectively multiplies the contact area and load-bearing capacity without requiring a proportional increase in the overall coupling surface footprint, thus improving torque transmission while controlling device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This serration design ensures precise self-centering and high torque transmission, simplifying the mounting process and extending the tool head's service life by maintaining precise alignment and efficient power transfer during operation.
Implementation Method 1
a first serration having a plurality of grooves and ribs extending at least primarily parallel to one another
Implementation Method 2
The serration advantageously leads to an effective enlargement of the coupling surface compared to a coupling surface having a planar shape
Implementation Method 3
at least two part-serrations oriented toward one another in the rotational direction at an angle, each having a plurality of ribs and grooves running preferably at least primarily parallel for centering the tool head relative to the carrier shank
Data Source
AI summary
The invention relates to a tool head for a rotary tool. The tool head extends along, and rotates about, a rotational axis in a rotational direction during operation. The tool head is designed for replaceable fastening on a carrier shank of the rotary tool and comprises on the back thereof a coupling surface comprising a first serration having a plurality of ribs running parallel to one another and grooves running parallel to one another. The first serration comprises at least two part-serrations oriented toward one another in the rotational direction at an angle. Each part-serration having a plurality of ribs and grooves running parallel, for centering the tool head relative to the carrier shank. The invention furthermore relates to a rotary tool having such a tool head.