Dressing Worm Gear Tools via Dynamic Line Contact
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Solution Overview
Problem
Existing methods for dressing grinding worms for gear machining, such as those using profile rollers or line dressing, are limited in their ability to flexibly modify the surface geometry, resulting in either restricted profile shape influence or economically inefficient processes with high roughness and shape deviations.
Innovation Solution
A method that utilizes line contact between the dresser and tool, allowing for targeted modification of the surface geometry by adjusting the position of the dresser relative to the tool, incorporating additional degrees of freedom such as rolling angles, crowning, and radius assignments to enhance flexibility and precision in tool modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dressing with a profile roller is used, then dressing time is reduced, but the ability to influence profile shape is limited
Solution Approach 1:
The invention makes the dresser position dynamic by introducing additional degrees of freedom (rolling angles α and β, crowning, radius assignments) that can be adjusted during the dressing process. This allows the system to adapt the profile shape influence while maintaining line contact for efficient dressing, resolving the contradiction between fast dressing and shape flexibility
Solution Approach 2:
The invention changes key parameters of the dressing process by allowing independent adjustment of rolling angles (α, β), crowning, and radius assignments between dresser and tool. These parameter changes enable flexible profile shape modification while preserving the line contact mechanism that ensures short dressing times
2Adaptability or versatility
If line dressing is used, then profile shape flexibility is improved, but the number of strokes increases and process efficiency decreases
Solution Approach 1:
The invention transforms the static line dressing process into a dynamic one by enabling continuous adjustment of rolling angles and crowning during a single stroke. This allows the full profile shape flexibility to be achieved in one pass rather than requiring multiple strokes, thereby resolving the contradiction between shape flexibility and productivity
3Productivity
If dressers with short, straight profile shape are used, then number of strokes is reduced, but profile modifications are roughly approximated with shape deviations
Solution Approach 1:
The invention compensates for the limited profile shape of short, straight dressers by introducing parameter changes in rolling angles (α, β) and crowning. These parameter adjustments enable precise profile modifications to be achieved even with simple dresser geometries, resolving the contradiction between reduced stroke count and modification precision
Data Source
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AI summary
The present invention relates to a method for dressing a tool, which can be used for gear machining of a workpiece, on a dressing machine, wherein the dressing is carried out with line contact between the dresser and the tool, wherein a targeted modification of the surface geometry of the tool is produced by the suitable selection of the position of the dresser relative to the tool during dressing, wherein the targeted modification of the surface geometry of the tool can be specified at at least three pitch angles, and/or wherein a crowning of the targeted modification of the surface geometry of the tool can be specified, and/or wherein the targeted modification of the surface geometry of the tool can be specified at at least two pitch angles and additionally an assignment of a specific radius of the dresser to a specific radius of the tool is carried out.and/or wherein a slope of the targeted modification of the surface geometry of the tool can be specified and, in addition, a specific radius of the dresser is assigned to a specific radius of the tool, and/or that two specific radii of the dresser are assigned to two specific radii of the tool, and/or that during dressing, the tool rotation angle and the tool width position are changed in order to guide the dresser along the tool, and at least two further degrees of freedom of the relative position between dresser and tool are set independently of each other to influence the gear geometry produced by the dressing and/or to assign a specific radius of the dresser to a specific radius of the tool.