Eyeglass Lens Roughing Apparatus Axial Deviation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The processing of thermoplastic eyeglass lenses with water repellent coatings faces significant axial deviation issues due to the slippery surface, which existing control methods fail to adequately suppress, leading to prolonged processing times.
Innovation Solution
An eyeglass lens processing apparatus that includes a lens rotating unit, a processing tool rotating unit, and an axis-to-axis distance changing unit, controlled by a unit that performs a first step where the lens is positioned at multiple angles without rotation and the roughing tool cuts into a roughing path, followed by a second step where the lens is rotated and the axis-to-axis distance is adjusted to complete the roughing, optimizing the cutting path and reducing axial deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the up-cut method is used for roughing thermoplastic lenses, then processing waste is discharged away from the processed periphery preventing attachment, but axial deviation occurs frequently due to increased pulling force on the lens
Solution Approach 1:
The roughing process is divided into two distinct steps: a first step using the down-cut method to remove the majority of material, and a second step using the up-cut method to finish the periphery. This segmentation allows each step to utilize the advantages of its respective cutting method while avoiding their disadvantages, thereby resolving the contradiction between waste discharge and axial deviation.
Solution Approach 2:
The first step performs preliminary roughing by removing the bulk of material using the down-cut method before the second step applies the up-cut method. This preliminary action reduces the processing load and stabilizes the lens position, preventing axial deviation in the subsequent finishing step while still achieving effective waste discharge.
2Manufacturing precision
If the down-cut method is used for roughing thermoplastic lenses, then axial deviation is reduced due to weaker pulling force, but processing waste becomes sticky and attaches to the lens periphery due to heat influence
Solution Approach 1:
The roughing process is divided into two distinct steps: a first step using the down-cut method to remove the majority of material, and a second step using the up-cut method to finish the periphery. This segmentation allows each step to utilize the advantages of its respective cutting method while avoiding their disadvantages, thereby resolving the contradiction between waste discharge and axial deviation.
Solution Approach 2:
The first step performs preliminary roughing by removing the bulk of material using the down-cut method before the second step applies the up-cut method. This preliminary action reduces the processing load and stabilizes the lens position, preventing axial deviation in the subsequent finishing step while still achieving effective waste discharge.
3Manufacturing precision
If existing control methods (load torque detection, rotation speed reduction, axis-to-axis distance adjustment) are applied to water repellent coated thermoplastic lenses, then some axial deviation suppression is achieved, but processing time is lengthened greatly
Solution Approach 1:
The roughing process is divided into two distinct steps: a first step using the down-cut method to remove the majority of material, and a second step using the up-cut method to finish the periphery. This segmentation allows each step to utilize the advantages of its respective cutting method while avoiding their disadvantages, thereby resolving the contradiction between waste discharge and axial deviation.
Solution Approach 2:
The first step performs preliminary roughing by removing the bulk of material using the down-cut method before the second step applies the up-cut method. This preliminary action reduces the processing load and stabilizes the lens position, preventing axial deviation in the subsequent finishing step while still achieving effective waste discharge.
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 efficiently suppresses axial deviation during the processing of thermoplastic lenses, ensuring accurate and timely completion of the eyeglass lens periphery roughing.
Implementation Method 1
a roughing tool such as a roughing grindstone is pressed on the lens, whereby the periphery of the lens is roughed
Data Source
AI summary
In an eyeglass lens processing apparatus, if a material selector selects a thermoplastic material for the lens, a control unit performs a first step and then a second step. In the first step, the control unit controls a lens rotating unit to position a lens in a plurality of lens rotation angles and controls an axis-to-axis distance changing unit to cause a roughing tool to cut into the lens up to a roughing path for each of the plurality of lens rotation angles, the lens being not rotated by the lens rotating unit when the roughing tool is cutting into the lens up to the roughing path. In the second step, the control unit controls the lens rotating unit and the axis-to-axis distance changing unit to rough the lens based on the roughing path while the lens rotating unit rotates the lens.