Stability study of removal function for aspheric surface based on non-Newtonian fluid polishing tool

2020 ◽  
Author(s):  
Zhenjun Bao ◽  
Hneg Zhu ◽  
Zhigang Li ◽  
Dingyao Yan
Keyword(s):  
Newtonian Fluid ◽  
Stability Study ◽  
Aspheric Surface ◽  
Polishing Tool

Fundamental Investigation on the Polishing Aspheric Elements with Doughnut-Shaped MCF Slurry

2018 ◽  
Vol 792 ◽  
pp. 179-184 ◽  
Author(s):  
Ming Feng ◽  
Yong Bo Wu ◽  
Teruo Bitoh ◽  
Tsunehisa Suzuki ◽  
Mitsuyoshi Nomura ◽  
...  
Keyword(s):  
Experimental Result ◽  
Aspheric Surface ◽  
Aspheric Surfaces ◽  
Variable Parameters ◽  
Flat Surfaces ◽  
Surface Polishing ◽  
Fundamental Investigation ◽  
Novel Method ◽  
Curve Radius ◽  
Polishing Tool

Previous researches have confirmed that MCF (magnetic compound fluid) slurry shows outstanding performance in the nanoprecision polishing of flat surfaces and V-grooves. However, no investigations have been conducted on the polishing of aspheric surfaces using MCF slurry. In this work, a novel method employing a doughnut-shaped MCF polishing tool and a 6-DOF manipulator has been proposed for the aspheric surface polishing. The time consumption for forming stable polishing tool and its final appearance are investigated. Flat aluminum alloy workpieces that can be considered as a kind of aspheric elements with infinite curve radius were adopted in the investigation of the polished forces under variable parameters. As a typical experimental result, with MCF3 slurry, 2.5ml volume of supplied slurry and work gap 3.5 mm, the surface roughness Ra decreases from 125nm to almost 10nm after 90 min polishing, confirming that the proposed method has the potential to polish aspheric surfaces.

Polishing path generation for physical uniform coverage of the aspheric surface based on the Archimedes spiral in bonnet polishing

2019 ◽  
Vol 233 (12) ◽  
pp. 2251-2263 ◽  
Author(s):  
Qizhi Zhao ◽  
Lei Zhang ◽  
Yanjun Han ◽  
Cheng Fan
Keyword(s):  
Tool Path ◽  
Curved Surface ◽  
Path Generation ◽  
Aspheric Surface ◽  
Polishing Process ◽  
Bonnet Polishing ◽  
Archimedes Spiral ◽  
Uniform Coverage ◽  
Polishing Path ◽  
Polishing Tool

As a new polishing method, bonnet polishing is suitable for polishing the curved surface due to its advantages in flexibility and adaptability of the polishing tool. In the polishing process, the contact state between the bonnet and the curved surface always changes. The traditional polishing tool path with equal interval will inevitably lead to over-polished areas and unpolished areas. In this article, a new tool path for bonnet polishing, which is called the revised Archimedes spiral polishing path, is proposed to ensure the physical uniform coverage of the curved surface in bonnet polishing. The path generation method is based on the modified tool–workpiece contact model and the pointwise searching algorithm. To prove the effectiveness of the revised path, two aspheric workpieces were polished along the traditional Archimedes spiral polishing path and the revised path, respectively. The roughnesses of the two workpieces are 10.94 and 10 nm, and the profile tolerances are 0.4097 and 0.2037 μm, respectively. The experimental results show that the revised path achieves lower roughness and surface tolerance than the traditional Archimedes path, which indicates that the revised path can achieve uniform physical coverage on the surface.

Effects analysis of large area polishing tool on aspheric surface quality

2012 ◽  
Author(s):  
Yun-long Zhang ◽  
Feng Zhang ◽  
Jin-rui Yan ◽  
Ying Su ◽  
Rui Guo ◽  
...  
Keyword(s):  
Surface Quality ◽  
Aspheric Surface ◽  
Large Area ◽  
Polishing Tool

Aspheric surface polishing with orthogonal velocity polishing tool

2021 ◽  
Author(s):  
Zhimin Rao ◽  
Haitao Liu ◽  
Jieli Wu ◽  
Qiang Chen ◽  
Dailu Wang
Keyword(s):  
Aspheric Surface ◽  
Surface Polishing ◽  
Polishing Tool

Study on Polishing Tool Contact Deformation for Large Robotic Aspheric Surface Compliant Polishing

2013 ◽  
Vol 433-435 ◽  
pp. 2058-2063
Author(s):  
Wei Chen ◽  
Jian Ming Zhan ◽  
Min Qing Zhang
Keyword(s):  
Mutual Interaction ◽  
Work Piece ◽  
Aspheric Surface ◽  
Contact Deformation ◽  
Rough Machining ◽  
Compliant Polishing ◽  
Polishing Force ◽  
Pneumatic Servo System ◽  
Adaptive Ability ◽  
Polishing Tool

Due to the problem of the mutual interaction between the polishing tool system and the control of poses and positions, it is difficult to hybrid-synchronizationally control the polishing force, the posture of polishing tool head and the polishing trajectory. So the article designed a set of compliant tools that take the pneumatic servo system as the control system, which was used for active polishing aspheric surface of Robot. It was to accomplish the Robots self-adaptive control to the posture of the polishing tool as well as to figure out the correlation of the contact deformation between the polishing tool and the work piece surface, which makes a theoretical analysis on dynamic and steady characteristics of the contact deformation of the tool system. It applied the meek and polishing tools to the polishing processing of the rough machining of large aspheric surface samples to obtain the data. According to the statistics, the polishing tools can effectively solve the problem of the mutual interaction between the polishing tool system and the control of poses and positions. It also owns good adaptive ability and its machining aspheric surface quality can achieve nanoscale.

Experimental Study on Polishing Characteristics of Ultrasonic- Magnetorheological Compound Finishing

2009 ◽  
Vol 76-78 ◽  
pp. 235-239 ◽  
Author(s):  
Fei Hu Zhang ◽  
Xing Bin Yu ◽  
Yong Zhang ◽  
Yong Yong Lin ◽  
Dian Rong Luan
Keyword(s):  
Material Removal ◽  
Optical Glass ◽  
Removal Rate ◽  
New Technology ◽  
Computer Control ◽  
Small Radius ◽  
Magnetic Flux Density ◽  
Aspheric Surface ◽  
Technological Parameters ◽  
Polishing Tool

Concave aspheric surface with small radius is difficult to be fabricated by most of existing technologies for optical manufacture. Ultrasonic- magnetorheological compound finishing (UMC finishing) is a new technology for the ultra-precision machining of concave aspheric surface with small radius and freeform surface. The principle and experimental deviece used in UMC finishing are introduced. Main technological parameters in UMC finishing include the magnetic flux density, the gap between the polishing tool head and the workpiece, the rotational speed of polishing tool head and so on. The technology experiment of UMC finishing for optical glass K9 is conducted, and the influence of main technological parameters on the material removal rate has been studied by analysis of experimental results. The analysis of removal profile curve of UMC finishing spots prove that the material removal function of UMC finishing meet the surface error convergence requiement in computer control precise optical surface machining. The part surfaces after UMC finishing are measured by an Atomic Force Microscopy (AFM), and the surface roughness Ra is 1.591 nm after polishing for 10 min. It is demonstrated that the polishing capability of the technology is excellent.

Aspheric surface profile effects analysis in polishing with ballonet polishing tool

2012 ◽  
Author(s):  
Feng Zhang ◽  
Yun-long Zhang ◽  
Wen-jie Kang ◽  
Ying Su ◽  
Chao-ping Chen ◽  
...  
Keyword(s):  
Surface Profile ◽  
Aspheric Surface ◽  
Polishing Tool

Distortion of removal function based on the local asphericity of aspheric surface and the viscoelasticity of polishing tool in computer-controlled optical surfacing

2017 ◽  
Vol 232 (7) ◽  
pp. 1135-1145 ◽  
Author(s):  
Xianhua Chen ◽  
Bo Zhong ◽  
Jian Wang ◽  
Hongzhong Huang ◽  
Wenhui Deng ◽  
...  
Keyword(s):  
Contact Region ◽  
Influence Factors ◽  
Least Square Method ◽  
Least Square ◽  
Experimental Result ◽  
Aspheric Surface ◽  
Optical Surfaces ◽  
Computer Controlled Optical Surfacing ◽  
Computer Controlled ◽  
Polishing Tool

In the process of large aspheric optical surfaces fabrication, the distortion of the removal function is a big problem that affects the producing efficiency and accuracy, due to the misfit between the tool and the aspheric surface in the contact region. Consequently, this paper aims to find out the influence factors and the distortion rule of aspheric removal function in the computer-controlled optical surfacing. Firstly, based on the analysis of the sub-aperture polishing technology for the large aspheric optical surfaces, the local asphericity of aspheric surface and the viscoelasticity of polishing tool are supposed to be the main sources. After that, a method to calculate the local asphericity considering the misfit between the tool and the aspheric surface is proposed based on the least square method, and the viscoelasticity of the polishing tool is obtained through viscoelastic experiment. Subsequently, combining the results of the local asphericity of aspheric surface and the viscoelasticity of polishing tool, the prediction of the distortion rule of aspheric removal function is presented. Finally, the comparative experiment is carried out, and the removal function on different regions of the aspheric surface is obtained. The experimental result indicated that the distortion of the removal function is consistent with the theoretical result. Through this study, the distortion rule of aspheric removal function in the computer-controlled optical surfacing with pitch tool is finally mastered, which provides a theoretical guidance for the computer-controlled optical surfacing process optimization.

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