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

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.

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Aspheric surface polishing with orthogonal velocity polishing tool

10.1117/12.2604036 ◽

2021 ◽

Author(s):

Zhimin Rao ◽

Haitao Liu ◽

Jieli Wu ◽

Qiang Chen ◽

Dailu Wang

Keyword(s):

Aspheric Surface ◽

Surface Polishing ◽

Polishing Tool

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

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406217702414 ◽

2017 ◽

Vol 232 (7) ◽

pp. 1135-1145 ◽

Cited By ~ 2

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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Computer numeric control subaperture aspheric surface polishing—microroughness evaluation

Optical Engineering ◽

10.1117/1.oe.53.9.092011 ◽

2014 ◽

Vol 53 (9) ◽

pp. 092011 ◽

Cited By ~ 3

Author(s):

Frantisek Prochaska ◽

Jaroslav Polak ◽

Ondrej Matousek ◽

David Tomka

Keyword(s):

Aspheric Surface ◽

Surface Polishing ◽

Computer Numeric Control

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Composite clustering normal distribution transform algorithm

International Journal of Advanced Robotic Systems ◽

10.1177/1729881420912142 ◽

2020 ◽

Vol 17 (3) ◽

pp. 172988142091214

Author(s):

Tian Liu ◽

Jiongzhi Zheng ◽

Zhenting Wang ◽

Zhengdong Huang ◽

Yongfu Chen

Keyword(s):

Normal Distribution ◽

Experimental Result ◽

Geometric Feature ◽

Matching Accuracy ◽

Localization And Mapping ◽

Density Based Clustering ◽

Scan Registration ◽

Novel Method ◽

Value Decomposition

Scan registration is a fundamental step for the simultaneous localization and mapping of mobile robot. The accuracy of scan registration is critical for the quality of mapping and the accuracy of robot navigation. During all of the scan registration methods, normal distribution transform is an efficient and wild-using one. But normal distribution transform will lead to the unreasonable interruption when splitting the grid and can’t express the points’ local geometric feature by prefixed grid. In this article, we propose a novel method, composite clustering normal distribution transform, which comprises the density-based clustering and k-means clustering to aggregate the points with similar local distributing feature. It takes singular value decomposition to judge the suitable degree of one cluster for further division. Meanwhile, to avoid the radiating phenomenon of LIDAR in measuring the points’ distance, we propose a method based on trigonometric to measure the internal distance. The clustering method in composite clustering normal distribution transform could ensure the expression of LIDAR’s local distribution and matching accuracy. The experimental result demonstrates that our method is more accurate and more stable than the normal distribution transform and iterative closest point methods.

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Study on the orthomogonalization for hybrid motion/force control and its application in aspheric surface polishing

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-014-6499-7 ◽

2014 ◽

Vol 77 (5-8) ◽

pp. 1259-1268 ◽

Cited By ~ 3

Author(s):

Liyong Hu ◽

Jianming Zhan

Keyword(s):

Force Control ◽

Aspheric Surface ◽

Surface Polishing ◽

Hybrid Motion

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

Second Target Recognition and Artificial Intelligence Summit Forum ◽

10.1117/12.2548883 ◽

2020 ◽

Author(s):

Zhenjun Bao ◽

Hneg Zhu ◽

Zhigang Li ◽

Dingyao Yan

Keyword(s):

Newtonian Fluid ◽

Stability Study ◽

Aspheric Surface ◽

Polishing Tool

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

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405419838655 ◽

2019 ◽

Vol 233 (12) ◽

pp. 2251-2263 ◽

Cited By ~ 3

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.

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On-machine truing of diamond wheel and high-efficiency grinding of monocrystal silicon for aspheric surface

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405415616792 ◽

2016 ◽

Vol 231 (1) ◽

pp. 186-192 ◽

Cited By ~ 4

Author(s):

Bing Chen ◽

Bing Guo ◽

Qingliang Zhao

Keyword(s):

Surface Quality ◽

Material Removal ◽

High Efficiency ◽

Diamond Wheel ◽

Experimental Results ◽

Aspheric Surface ◽

Removal Rates ◽

Aspheric Surfaces ◽

Silicon Carbon

To realize the high-efficiency grinding of the aspheric surfaces on monocrystal silicon, a novel on-machine truing method for the resin-bonded arc-shaped diamond wheels was proposed utilizing rotary green silicon carbon rod, and then the high-efficiency grinding of the aspheric surface was performed. First, the principle of mutual-wear for truing arc-shaped diamond wheel was introduced, and the truing performance was studied. The experimental results showed that the top morphology of the trued arc-shaped wheel was precise and smooth, and the run error on the top of the trued arc-shaped wheel was reduced from 41 to 10 µm after truing. Furthermore, high-efficiency grinding experiments revealed that the surface quality of the aspheric surface increased with the increase in the average material removal rates.

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