Gear Tooth Flank Hard Machining via Tangential Tool Path
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Solution Overview
Problem
Hard machining of gear wheels often results in suboptimal surface qualities and contact patterns due to deformations from hardening, leading to poor hydrodynamic lubrication and reduced productivity.
Innovation Solution
A method employing a machine with at least five axes controlled in coordination and an additional tool axis, using a rotationally symmetrical tool like an end mill or grinding rod to guide a rectilinear section tangentially along the tooth flank, following traces that approximate rolling ISO lines, ensuring complete removal of hardening deformations and achieving defined bearing properties and surface qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional hard machining methods are used with simple tool guidance, then productivity is maintained, but surface quality and contact pattern are suboptimal due to hardening deformations
Solution Approach 1:
The patent applies dynamic motion of the tool along the tooth flank by guiding the tool in curved traces that follow the rolling ISO lines. The tool moves dynamically along the surface with varying orientation and position, enabling complete removal of hardening deformations while maintaining high productivity through optimized motion paths
Solution Approach 2:
The patent introduces complex multi-axis coordination (5 axes + 1 tool axis) to guide the tool in three-dimensional curved traces along the tooth flank. This dimensional approach allows the tool to access and machine the entire surface area effectively, removing deformations from all regions while maintaining productivity
2Productivity
If fast tool guidance is used to maintain productivity, then machining time is reduced, but surface quality deteriorates and hydrodynamical lubrication problems occur
Solution Approach 1:
The tool is guided dynamically along curved traces that follow the rolling ISO lines, creating an enveloping motion that ensures complete coverage of the tooth flank surface. This dynamic guidance maintains optimal cutting conditions throughout the machining process, achieving both high productivity and excellent surface quality with proper contact patterns
Solution Approach 2:
The machining process employs continuous tool motion along the entire tooth flank surface without interruptions or rapid directional changes. The coordinated multi-axis movement ensures continuous material removal and continuous tool engagement with the workpiece, maintaining surface quality while preserving productivity
3Manufacturing precision
If complex multi-axis coordination is implemented to improve surface quality, then manufacturing precision is enhanced, but device complexity increases
Solution Approach 1:
The patent employs a universal multi-axis coordination system that can machine various tooth flank geometries and gear types using the same equipment configuration. The 5 axes + 1 tool axis system provides versatile capability to handle different machining requirements, making the complex device applicable to a wide range of manufacturing tasks
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 ensures exact surface qualities and bearing properties, enhancing the operating life and quiet running of gear wheels, and improves hydrodynamic lubrication when paired gear wheels are used.
Implementation Method 1
a rotationally symmetrical tool, preferably an end mill or a grinding rod, is set in a rotation about the tool axis... while the cylindrical tool takes off material from the pre-manufactured tooth flank due to the rotation about the tool axis
Data Source
AI summary
The invention relates to a method for hard fine machining of a pre-manufactured flank (11) of a gear wheel by a machine having at least five axes controlled in coordination and one additional tool axis (WA). According to the invention, a rotation-symmetrical tool (20.1) is driven on the machine side such that it is set into a rotation (RA) about the tool axis (WA). In addition, the axes controlled in coordination are actuated such that a straight-lined section of the surface line of the tool (20.1) is guided tangentially along the flank (11) in a generating movement while the tool (20.1) removes material on the pre-manufactured flank (11) by means of the rotation (R1) about the tool axis (WA). The generating movement follows pre-specified movement vectors (E).