Skiving Tool Axial Edge Offsets for Quieter Tooth Flanks
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Solution Overview
Problem
Existing skiving methods produce teeth with equidistant feed marks that lead to uniform excitation, resulting in undesirable noise generation during operation.
Innovation Solution
A skiving tool with cutting edges arranged at different axial heights along the tool axis, ensuring they engage at varying time intervals and distances on the tooth flank, creating a broader frequency spectrum and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If cutting edges are arranged at the same axial height on the skiving tool, then the machining process is simple and easy to manufacture, but the feed marks are equidistant which leads to uniform excitation and increased noise generation
Solution Approach 1:
The patent applies local quality by varying the axial heights of individual cutting edges along the tool axis. Each cutting edge is positioned at a specific axial height to create non-uniform engagement intervals, transforming the uniform structure into a differentiated one that disrupts the equidistant feed mark pattern and reduces noise-generating vibrations.
Solution Approach 2:
The patent implements asymmetry by arranging cutting edges at different axial heights rather than symmetrically at the same height. This asymmetric arrangement creates variable time intervals between successive cutting edges engaging the same tooth flank, breaking the uniform excitation pattern that causes noise.
2Object-generated harmful factors
If cutting edges are arranged at different axial heights, then the feed marks are non-equidistant which reduces uniform excitation and noise, but the tool design and manufacturing become more complex
Solution Approach 1:
The patent applies parameter changes by modifying the axial height parameter of cutting edges. By varying this geometric parameter across different cutting edges, the invention creates non-uniform engagement patterns that reduce vibration, while the parameter variations are controlled within practical manufacturing ranges to maintain ease of fabrication.
3Manufacturing precision
If multiple cutting edges successively remove material from the same tooth flank, then the machining precision can be improved through rough and fine machining, but the machining time increases due to sequential engagement
Solution Approach 1:
The patent implements periodic action through the sequential engagement of multiple cutting edges at different axial heights. The cutting edges engage the tooth flank in a periodic sequence, with each edge performing a portion of the material removal. This periodic multi-stage cutting achieves both roughing and finishing in one continuous operation, balancing precision and efficiency.
Data Source
AI summary
Disclosed is a skiving tool for machining teeth where machining marks are produced at unequal distances. Some cutting edges of a skiving tool at least partially extend at different heights along a tool axis. During machining, cutting edges arranged at different axial heights relative to the workpiece axis successively engage on a tooth flank. The engagement of the cutting edges occurs at different time intervals and at different distances in the width direction of the tooth flank. The effects of the engagement of the cutting edges on the machining process and the excitation of vibrations when the teeth produced are used therefore have a frequency spectrum of greater width and lower amplitude than if the cutting edges were to engage at equal time intervals and equal distances. The more irregular surface structure of the teeth have a positive effect on noise excitation behavior when teeth are engaging with other teeth.