Optical Workpiece Asymmetric Mounting for Uniform Surface Quality
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Solution Overview
Problem
Existing methods for processing optical workpieces, such as lenses or spectacle glasses, face challenges in achieving uniform surface quality due to varying cutting speeds and the need for frequent tool adjustments, leading to inadequate surface formation and increased manufacturing interruptions.
Innovation Solution
The workpiece is positioned in a fixture such that the axis of rotation of the spindle is offset from the workpiece axis, allowing for a constant cutting speed and eliminating the center problem, enabling high-precision surface quality without the need for frequent tool adjustments, and allowing for simultaneous processing of multiple workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the workpiece axis coincides with the spindle rotation axis, then the workpiece can be processed with standard turning tools, but the cutting speed approaches zero at the center causing inadequate surface formation and requiring frequent tool adjustments
Solution Approach 1:
The patent applies asymmetry by deliberately offsetting the workpiece axis from the spindle rotation axis. The workpiece is mounted in a fixture where its axis is positioned at a distance from the rotation axis, creating an asymmetric configuration that eliminates the zero cutting speed problem at the center while maintaining processing capability.
Solution Approach 2:
The patent introduces a dimensional shift by moving the workpiece axis out of the rotation axis in a spatial dimension. This dimensional offset transforms the problematic one-dimensional alignment into a two-dimensional arrangement, allowing the workpiece to be processed while avoiding the singularity at the rotation center.
2Manufacturing precision
If the cutting speed is kept constant across the entire surface, then uniform surface quality is achieved, but this requires infinite rotational speed at the center which cannot be implemented in practice
Solution Approach 1:
By adopting an asymmetric mounting configuration where the workpiece axis is offset from the rotation axis, the patent eliminates the need for infinitely high spindle speeds at the center. The asymmetric geometry ensures that all cutting points maintain appropriate cutting speeds without requiring impractical rotational velocities.
3Productivity
If multiple workpieces are processed simultaneously, then productivity increases, but the complexity of the processing device increases
Solution Approach 1:
The patent applies universality by designing a spindle and fixture system that can accommodate multiple workpieces simultaneously. The asymmetric mounting configuration and fixture design allow for universal processing of multiple optical workpieces on a single spindle, enabling parallel production without requiring separate processing systems for each workpiece.
Data Source
AI summary
The invention relates to a method for processing the surfaces of optical workpieces (3) such as optical or eye glass lenses carried out with the aid of a tool (5) and consisting in holding at least one workpiece (3) in a work piece receiving support (4) which is rotatable around the axis of a workpiece spindle (1′). The invention is characterized in that the workpiece (3) is received in the receiving support (4) in such a way that the axis of rotation (2) of the workpiece spindle is placed remotely from the axis (8) of at least one workpiece (3) and the axis (18) of the workpiece support is at least partially in a parallel position to the axis of rotation of the workpiece spindle.