Review of Optical Manufacturing 2000 to 2020

Due to increasing demand for high accuracy and high-quality surface finish in optical industry, contact lens manufacturing requires reliable models for predicting surface roughness (Ra) which plays a very important role in the optical manufacturing industry. In this study, a Nanoform 250 ultra-grind turning machine was used for machining, while cutting speed, feed rate, and the depth of cut (with values selected to cover a wide range based on the literature) were considered as the machining parameters for a diamond turned rigid polymethylmethacrylate (PMMA) contact lens polymer. Turning experiments were designed and conducted according to Box–Behnken design which is a response surface methodology technique. Fuzzy logic-based artificial intelligence method was employed to develop an electrostatic charge (ESC), Ra, and material removal rate (MRR) prediction models. The accuracy and predictive ability of the fuzzy logic model was then judged by considering an average percentage error between experimental values and fuzzy logic predictions. Further, a comparative evaluation of experiments and fuzzy logic approach showed that the average errors of ESC, Ra, and MRR using fuzzy logic system were in tandem with experimental results. Hence, the developed fuzzy logic rules can be effectively utilized to predict the ESC, Ra, and MRR of a rigid PMMA contact lens polymers in automated optical manufacturing environments for high accuracy and computational cost.

Download Full-text

Advanced optical manufacturing digital integrated system

10.1117/12.975962 ◽

2012 ◽

Author(s):

Yizheng Tao ◽

Xinglan Li ◽

Wei Li ◽

Dingyong Tang

Keyword(s):

Integrated System ◽

Optical Manufacturing

Download Full-text

Experimental Research on Polishing Spot of Bonnet Polishing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.10-12.385 ◽

2007 ◽

Vol 10-12 ◽

pp. 385-389

Author(s):

J.F. Song ◽

Ying Xue Yao ◽

D.G. Xie ◽

Bo Gao

Keyword(s):

Experimental Research ◽

Material Removal Rate ◽

Material Removal ◽

Removal Rate ◽

Technological Parameters ◽

Bonnet Polishing ◽

Surface Configuration ◽

Polishing Tool ◽

Optical Manufacturing ◽

Manufacturing Machine

A new optical manufacturing technology called bonnet polishing has been developed over last decade. During bonnet polishing, the puffed bonnet is flexible and self-reacting against the surface configuration of optical parts. So the same polishing tool can be used in machining the optical parts with different curvature. The mechanism of the bonnet polishing is described in this paper firstly. Since the optical workpiece has been polished in the “polishing spot”, the bonnet polishing experiments have been accomplished on the trial-manufacturing machine to study the effect of technological parameters on the size and shape of “polishing spot” and the material removal rate of optical workpiece. At last, the material removal rules of the bonnet polishing have been given in the paper.

Download Full-text