Ferrule End Face Grinding with Stationary Workpiece
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Solution Overview
Problem
Existing methods for forming convex end faces on ferrules for optical fiber connectors are limited by low production rates, risk of fiber breakage, and the need for multiple processing steps, which increase production time and costs.
Innovation Solution
A method involving a grinding wheel assembly with multiple grinding wheels, each with a working surface featuring different abrasive grits and radii of curvature, is used to process the ferrule end face while holding the ferrule stationary. The grinding wheels are moved along a curve perpendicular to the central axis, imparting a convex shape to the ferrule end face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a grinding wheel with fine abrasive is used to form a convex end face on a ferrule, then the surface finish quality is improved, but the processing time increases significantly, reducing production rate
Solution Approach 1:
The grinding process is divided into multiple stages using different grinding wheels with progressively finer abrasive grits. Coarse grinding wheels remove material quickly to establish the convex shape, followed by medium and fine grinding wheels that progressively improve surface finish. This segmentation allows each stage to be optimized for its specific function, achieving high surface quality without sacrificing overall production rate.
2Shape
If the ferrule is rotated during the grinding process to form a convex end face, then the convex geometry can be achieved, but the fiber may break or detach from the ferrule
Solution Approach 1:
Instead of rotating the ferrule during grinding, the invention inverts the approach by keeping the ferrule stationary and rotating the grinding wheel. This inversion eliminates the risk of fiber breakage or detachment while still achieving the desired convex end face geometry through the rotating abrasive surface.
3Manufacturing precision
If multiple processing steps are used to achieve a smooth convex end face, then the surface quality is improved, but the production time increases and costs increase
Solution Approach 1:
Multiple grinding operations with different abrasive grits are merged into a single integrated process. The system uses multiple grinding wheels with progressively finer abrasives that work in sequence without requiring the workpiece to be removed or repositioned between steps. This combining of operations achieves high surface quality while minimizing production time and eliminating the need for separate processing stations.
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 enhances production rates by reducing processing time, eliminates the risk of fiber breakage, and achieves a smooth, highly polished convex end face without the need for additional processing steps.
Implementation Method 1
a grinding wheel having a concave interface may be brought to bear against a generally flat end face of the ferrule
Data Source
AI summary
A method of processing a ferrule end face using at least one grinding wheel rotatable about a central axis and having a working surface with an abrasive element is provided. The method includes holding the ferrule stationary, engaging the end face of the ferrule and the working surface of the at least one grinding wheel, rotating the at least one grinding wheel about the central axis, and moving the at least one grinding wheel relative to the ferrule along a curve perpendicular to the central axis. Processing the ferrule in this manner imparts a convex shape of the end face of the ferrule. An apparatus for carrying out the method is also disclosed.