scholarly journals Fabrication of high-precision freeform surface on die steel by ultrasonic-assisted slow tool servo

2021 ◽  
Vol 29 (3) ◽  
pp. 3708
Author(s):  
Yintian Xing ◽  
Chuang Li ◽  
Yue Liu ◽  
Chao Yang ◽  
Changxi Xue
Keyword(s):  
High Precision ◽  
Freeform Surface ◽  
Die Steel ◽  
Ultrasonic Assisted ◽  
Slow Tool Servo

Diamond Turning Freeform Optics

2007 ◽  
Vol 364-366 ◽  
pp. 1-6
Author(s):  
W. Jiang ◽  
Bill Tse ◽  
Roy Louie ◽  
Frankie Chan
Keyword(s):  
Diamond Turning ◽  
Freeform Surface ◽  
Work Piece ◽  
Freeform Optics ◽  
Milling Method ◽  
Slow Tool Servo ◽  
Optics Industry ◽  
Optics Fabrication ◽  
Five Axis ◽  
Machining Parameter

Freeform optics fabrication has become one of the hottest topics in optics industry in recent years. Although it still remains a challenge, many have tried different ways of manufacturing it. Some have achieved degrees of success. By means of a Nanotech 350-FG five axis diamond turning machine, we too have successfully produced some prototype freeform optics and lens arrays with Slow Tool Servo and Milling method. The produced freeform optics are mainly for automobile LED headlamps and the lens arrays are for LED illumination. In order to produce the freeform optics, we developed our own DT Slow Tool Servo program which is capable of generating a DT program for diamond turning a universal/general 3D freeform surface. Slow Tool Servo technique and Diamond Milling technique were mainly employed to produce these freeform surfaces. The manufacturing process and machining parameter details will be given in the paper. The two main methods we used will be compared and discussed as well. In measuring the freeform surface, a 3D white light interferometer was used to scan and obtain the surface coordinates. The software made by ourselves enabled us to compare the measure results of the work piece with that of the design drawings. The deviation of our finished forms is within 5 um from that of the nominal. The surface quality Rq is about 10 nm. Measuring equipment and methodology will also be discussed in the paper.

Fabrication and correction of freeform surface based on Zernike polynomials by slow tool servo

Optifab 2017 ◽  
2017 ◽  
Author(s):  
Yuan-Chieh Cheng ◽  
Ming-Ying Hsu ◽  
Wei-Jei Peng ◽  
Wei-Yao Hsu
Keyword(s):  
Freeform Surface ◽  
Zernike Polynomials ◽  
Slow Tool Servo

Generation of freeform surface by using slow tool servo

2017 ◽  
Author(s):  
Vinod Mishra ◽  
Kamal K Pant ◽  
Dali Ramu Burada ◽  
Vinod Karar ◽  
Gufran S khan ◽  
...  
Keyword(s):  
Freeform Surface ◽  
Slow Tool Servo

Investigation of Micro Holes Fabricated by Femtosecond Laser on S136

2015 ◽  
Vol 727-728 ◽  
pp. 205-208 ◽  
Author(s):  
Lei Zhang ◽  
Xiao Wen Cao ◽  
Deng Peng Huang ◽  
Dong Wei Ran ◽  
Shuo Tian ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Precision ◽  
Systematic Study ◽  
Laser Power ◽  
High Efficiency ◽  
Focal Length ◽  
Die Steel ◽  
Micro Holes ◽  
Focusing Lens ◽  
The Relationship

Femtosecond laser is now widely used in micro holes drilling because of its unique advantages, such as high efficiency, high precision and non-contact. Femtosecond laser is the best choice to fabricate micro holes. This paper makes a systematic study of the influence of laser power and number of pulses on diameter and depth of micro holes on S136 die steel through the focusing lens with focal length of 35 cm. A series of high-precision micro holes with different diameter and depth are fabricated. The relationship between the dimension of fabricated micro holes and the process parameters is determined.

scholarly journals Modeling and Analysis of System Error for Highly Curved Freeform Surface Measurement by Noncontact Dual-Axis Rotary Scanning

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 554
Author(s):  
Li Miao ◽  
Linlin Zhu ◽  
Changshuai Fang ◽  
Ning Yan ◽  
Xudong Yang ◽  
...  
Keyword(s):  
High Precision ◽  
Measurement Accuracy ◽  
Rotation Axis ◽  
Optical Probe ◽  
Measuring System ◽  
Freeform Surface ◽  
Normal Vector ◽  
Profile Measurement ◽  
Freeform Surfaces ◽  
System Error

Profile measurement is a key technical enabler in the manufacturing of highly curved freeform surfaces due to their complex geometrical shape. A current optical probe was used to measure nearly rotary freeform surfaces with the help of one rotation axis, because the probe needs to measure along the normal vector of the surface under the limitation of the numerical aperture (NA). This kind of measuring system generally has a high cost due to the high-precision, multi-axis platform. In this paper, we propose a low-cost, dual-axis rotation scanning method for a highly curved freeform surface with an arbitrary shape. The optical probe can scan the surface profile while always keeping consistent with the normal vector of the measuring points with the help of the double rotation axis. This method can adapt to the changes in curvature in any direction for a highly curved freeform surface. In addition, the proposed method provides a system error calibration technique for the rotation axis errors. This technique can be used to avoid the dependence of the measuring system on the high-precision platform. The three key system errors that affect the measurement accuracy such as installation error of the B-axis, A-axis, and XZ perpendicularity error are first analyzed through establishing an error model. Then, the real error values are obtained by the optimal calculation in the calibration process. Finally, the feasibility of the measurement method is verified by measuring one cone mirror and an F-theta mirror and comparing the results to those obtained using commercial equipment. The maximum measurable angle of the system is ±90°, the maximum measurable diameter is 100 mm, and the measurement accuracy of the system reaches the micron level in this paper.

Slow tool servo diamond turning of optical freeform surface for astigmatic contact lens

2011 ◽  
Author(s):  
Chun-Chieh Chen ◽  
Yuan-Chieh Cheng ◽  
Wei-Yao Hsu ◽  
Hsiao-Yu Chou ◽  
Pei-Jen Wang ◽  
...  
Keyword(s):  
Contact Lens ◽  
Diamond Turning ◽  
Freeform Surface ◽  
Slow Tool Servo

Freeform Surface Optical Components Machining by Slow Tool Servo Diamond Turning

2010 ◽  
Vol 47 (2) ◽  
pp. 022202
Author(s):  
关朝亮 Guan Chaoliang ◽  
戴一帆 Dai Yifan ◽  
尹自强 Yin Ziqiang
Keyword(s):  
Diamond Turning ◽  
Freeform Surface ◽  
Optical Components ◽  
Surface Optical ◽  
Slow Tool Servo
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