Hard Fine Machining Tool for Gear Toothing
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Solution Overview
Problem
Existing methods for fine machining of gear toothing surfaces often result in uneven roughness at the tip and base, requiring time-consuming adjustments and compromising geometry, with limited correction capabilities.
Innovation Solution
A hard fine machining tool with two axially adjacent machining zones, where the first zone is for grinding and the second zone is for fine grinding or polishing, using different pivoting angles and materials (e.g., ceramic and polyurethane) to allow for precise correction of the tool's pivot angle based on desired removal amounts, stored in a machine control for simulation and calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fine grinding or polishing processes are used after generative or profile grinding, then surface quality of the toothing is improved, but the roughness in the tip and base of the toothing becomes uneven and geometry is compromised
Solution Approach 1:
The tool is divided into two axially adjacent machining zones: a first machining zone for generative or profile grinding, and a second machining zone for fine grinding or polishing. Each zone can be independently dressed and positioned, allowing separate optimization of geometry creation and surface quality improvement without mutual interference.
Solution Approach 2:
The tool carrier is designed to pivot independently in two different pivot angles: a first pivot angle for the generative or profile grinding process, and a second pivot angle for the fine grinding or polishing process. This dynamic adjustment capability allows optimal positioning of each machining zone for its specific function while maintaining precise control over the tooth flank geometry.
2Manufacturing precision
If multiple tool settings and pivot angles are used for fine grinding and polishing, then surface quality is improved, but the process becomes time-consuming with repeated adjustments
Solution Approach 1:
Both the generative/profile grinding zone and the fine grinding/polishing zone are integrated into a single tool carrier that can pivot as one unit. The tool carrier incorporates both machining zones axially adjacent to each other, allowing both processes to be performed in sequence without removing or repositioning the tool, thereby eliminating repeated setup time.
Solution Approach 2:
The tool carrier serves multiple functions: it holds both machining zones, provides pivoting capability for both generative/profile grinding and fine grinding/polishing operations, and enables automatic switching between different pivot angles. This multi-functionality consolidates what would otherwise require separate tools and setups into a single integrated system.
3Manufacturing precision
If the distance of the axis is reduced to correct flank discrepancies, then contact percentage is improved, but machining forces increase and shape discrepancy occurs
Solution Approach 1:
The second machining zone is specifically designed for fine grinding or polishing with a focus on improving surface quality and contact percentage through localized material removal. The independent dressing capability of each zone allows precise control over the second zone's parameters to achieve optimal flank contact without requiring reduction of the axis distance, thereby avoiding excessive machining forces and shape distortion.
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 approach enables precise geometry of the tooth flank with improved surface quality and reduced machining time, maintaining shape tolerances and increasing the quality of the toothing and profile without the drawbacks of uneven roughness.
Implementation Method 1
the toothing of the gear or the gear-like profile of the workpiece is machined with a hard fine machining tool
Data Source
AI summary
A method for hard fine machining of the toothing of a gear that has an axis of rotation, wherein the toothing is machined with a hard fine machining tool. The machining tool rotates around an axis of rotation during hard fine machining. The method includes: a) Providing a hard fine machining tool that has axially adjacent machining zones, including a first zone for the grinding the toothing and a second zone for fine grinding and/or polishing the toothing; b) Grinding the toothing with the first zone, wherein a first pivoting angle exists between the axis of rotation of the gear and the axis of rotation of the machining tool; c) Fine grinding and/or polishing the toothing with the second zone of the machining tool, wherein a second pivoting angle exists, which is different from the first pivoting angle, between the axis of rotation of the gear and the axis of rotation of the machining tool.