Grindstone Outer End Portion Cutting for Optical Element Processing
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Solution Overview
Problem
Existing optical element processing tools face challenges in maintaining consistent processing tool diameter during the grinding or polishing of optical elements, leading to potential deviations in the spherical shape of the processed surfaces due to uneven abrasion of grindstones.
Innovation Solution
The optical element processing tool features a base plate with a predetermined curvature and a plurality of grindstones, where grindstones deviating from the processing tool diameter condition have their outer end portions cut out in parallel to the center axis, ensuring the processing tool diameter remains constant despite abrasion, thereby maintaining the target spherical shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grindstones are used without cutting out outer end portions, then the processing tool diameter can be initially set, but the processing tool diameter changes due to uneven abrasion during use
Solution Approach 1:
The outer end portions of the grindstones are cut out in advance before the grindstones are mounted on the processing tool. This preliminary action ensures that during the grindstone's service life, the abrasion occurs uniformly across the contact surface, maintaining consistent processing tool diameter without requiring later adjustments or replacements.
Solution Approach 2:
The grindstones are designed with non-uniform geometry where the outer end portions are cut out to create a specific shape. This local modification ensures that the abrasive surface maintains optimal contact characteristics throughout the grindstone's service life, preventing diameter deviation while preserving the necessary service duration.
2Manufacturing precision
If grindstones with uniform initial shape are used, then the spherical shape can be initially formed, but the spherical shape deviates due to uneven abrasion
Solution Approach 1:
The outer end portions of the grindstones are cut out before mounting to create a predetermined shape. This preliminary shaping action ensures that as the grindstone wears during use, the spherical surface of the optical element maintains its target shape accuracy throughout the extended service period, preventing deviation that would otherwise occur with uniform cylindrical grindstones.
Solution Approach 2:
By modifying the local geometry of the grindstone (cutting out outer end portions), the wear pattern is optimized to maintain spherical surface accuracy. This local quality adjustment ensures that different regions of the grindstone wear at rates that collectively preserve the spherical shape, extending the period during which high-quality spherical surfaces can be produced.
3Manufacturing precision
If outer end portions of grindstones are cut out, then the processing tool diameter remains constant, but the grindstone structure becomes more complex
Solution Approach 1:
The complex geometry of the grindstone is resolved by performing the cutting operation in advance during manufacturing or preparation. The grindstone is mounted with the pre-cut shape, and during operation, this predetermined geometry ensures constant processing tool diameter without requiring complex control systems or adjustments during the actual processing operation.
Solution Approach 2:
The complexity is localized to the grindstone preparation stage rather than the processing stage. By cutting out the outer end portions to create a specific shape, the grindstone achieves optimal performance with constant diameter maintenance during use. The structural complexity is traded for operational simplicity and precision.
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 stabilizes the quality of the processed surface by maintaining a consistent processing tool diameter, ensuring the optical element is processed into a precise spherical shape, even as the grindstones wear down.
Implementation Method 1
an optical element processing tool for grinding or polishing an optical element
Data Source
AI summary
An optical element processing tool for grinding or polishing an optical element includes: a base plate including a fixing region having a predetermined curvature; and a plurality of grindstones each formed in a columnar body having a same initial height, one end surface of the columnar body having an initial shape molded into a first spherical shape conforming to a processing target spherical shape of the optical element, and the other end surface of the columnar body being fixed to the fixing region of the base plate. A grindstone deviant from a condition among the plurality of grindstones, which is the grindstone not meeting a condition determined by a processing tool diameter of the processing tool, includes an outer end portion cut out at least in parallel to a center axis of the base plate so as to meet the condition.