Spur Toothing Wobble Forming for Mismatched Tooth Counts
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Solution Overview
Problem
Conventional methods for producing spur toothings, such as milling and wobble riveting, face challenges in achieving precise and efficient formation with reduced process forces, particularly in creating toothings with non-matching numbers of teeth.
Innovation Solution
A tool holder and tool arrangement where the wobble point is offset relative to the tooth base plane, allowing for the formation of spur toothings with a different number of teeth on the workpiece by adjusting the wobble point's position along the drive axis, utilizing embossing and guide teeth with varying configurations to reduce axial loads and improve dimensional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wobble point is positioned at the tooth base plane of the mating toothing, then a toothing with an identical number of teeth is created on the workpiece, but the process forces are high and the method cannot produce toothings with non-matching numbers of teeth
Solution Approach 1:
The patent applies parameter changes by offsetting the wobble point from the tooth base plane to a different position along the drive axis. This positional parameter change enables the tool to produce toothings with different numbers of teeth relative to the mating toothing, while also reducing the process forces required for the forming operation.
2Manufacturing precision
If conventional wobble riveting is used with the tool head inclined to the drive axis, then a spur toothing can be formed on the workpiece, but the method is limited to producing toothings with the same number of teeth as the mating toothing
Solution Approach 1:
The patent maintains the inclined tool head configuration for precise spur toothing formation while introducing a variable parameter: the offset position of the wobble point along the drive axis. By adjusting this offset, the method achieves both dimensional accuracy and the versatility to produce toothings with different numbers of teeth.
3Productivity
If the mating toothing on the tool head is used to form the spur toothing on the workpiece, then the process is efficient, but the number of teeth on the workpiece toothing must match the tool toothing
Solution Approach 1:
The patent preserves the efficient wobble riveting process while modifying the wobble point position parameter. This single parameter change enables the same efficient forming process to produce toothings with different tooth counts, eliminating the need for multiple specialized tools or complex reconfiguration.
4Force
If the wobble point is offset from the tooth base plane, then toothings with different numbers of teeth can be produced and process forces are reduced, but the tool configuration becomes more complex
Solution Approach 1:
The patent resolves the complexity issue by introducing the offset along the drive axis (a dimensional adjustment) rather than complicating the tool head geometry. This dimensional change enables versatile tooth count production and reduced process forces while maintaining relatively simple tool construction.
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 method reduces process forces and improves the precision and efficiency of spur toothing production, enabling the formation of toothings with varying numbers of teeth while maintaining dimensional accuracy and reducing overall effort.
Implementation Method 1
the longitudinal axis of the tool meets the drive axis of the tool holder at a wobble point... through rotary drive and longitudinal displacement of the tool holder with the associated wobbling rolling of the tool on the workpiece
Implementation Method 2
a toothing with a number of teeth that is not equal to the number of teeth of the mating toothing of the tool is produced on the workpiece
Data Source
AI summary
A device for producing a spur toothing includes a tool holder arranged for rotational drive about a drive axis and longitudinal displacement along the drive axis, and a tool arranged on the tool holder. The tool includes an end face, a mating toothing disposed on the end face and arranged for forming a spur toothing on a workpiece, and a longitudinal axis arranged at an angle to the drive axis such that the longitudinal axis meets the drive axis at a wobble point. The mating toothing has a tooth base plane and the wobble point is disposed on the drive axis in front of or behind the tooth base plane such that, through rotary drive and longitudinal displacement of the tool holder with the associated wobbling rolling of the tool on the workpiece, the spur toothing formed by the mating toothing has a number of teeth that is unequal to a number of teeth of the mating toothing.