Thematic analysis of sustainable ultra-precision machining by using text mining and unsupervised learning method

2022 ◽  
Vol 62 ◽  
pp. 218-233
Author(s):  
Hongting Zhou ◽  
Wai Sze Yip ◽  
Jingzheng Ren ◽  
Suet To
Keyword(s):  
Text Mining ◽  
Unsupervised Learning ◽  
Thematic Analysis ◽  
Precision Machining ◽  
Learning Method ◽  
Ultra Precision

scholarly journals A Self-Established “Machining-Measurement-Evaluation” Integrated Platform for Taper Cutting Experiments and Applications

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 929
Author(s):  
Xudong Yang ◽  
Zexiao Li ◽  
Linlin Zhu ◽  
Yuchu Dong ◽  
Lei Liu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Precision Machining ◽  
Two Dimensional ◽  
Dimensional Image ◽  
Two Dimensional Image ◽  
Integrated Platform ◽  
Hard And Brittle Materials ◽  
Ultra Precision ◽  
Cutting Experiments

Taper-cutting experiments are important means of exploring the nano-cutting mechanisms of hard and brittle materials. Under current cutting conditions, the brittle-ductile transition depth (BDTD) of a material can be obtained through a taper-cutting experiment. However, taper-cutting experiments mostly rely on ultra-precision machining tools, which have a low efficiency and high cost, and it is thus difficult to realize in situ measurements. For taper-cut surfaces, three-dimensional microscopy and two-dimensional image calculation methods are generally used to obtain the BDTDs of materials, which have a great degree of subjectivity, leading to low accuracy. In this paper, an integrated system-processing platform is designed and established in order to realize the processing, measurement, and evaluation of taper-cutting experiments on hard and brittle materials. A spectral confocal sensor is introduced to assist in the assembly and adjustment of the workpiece. This system can directly perform taper-cutting experiments rather than using ultra-precision machining tools, and a small white light interference sensor is integrated for in situ measurement of the three-dimensional topography of the cutting surface. A method for the calculation of BDTD is proposed in order to accurately obtain the BDTDs of materials based on three-dimensional data that are supplemented by two-dimensional images. The results show that the cutting effects of the integrated platform on taper cutting have a strong agreement with the effects of ultra-precision machining tools, thus proving the stability and reliability of the integrated platform. The two-dimensional image measurement results show that the proposed measurement method is accurate and feasible. Finally, microstructure arrays were fabricated on the integrated platform as a typical case of a high-precision application.

scholarly journals An Investigation of the Cutting Strategy for the Machining of Polar Microstructures Used in Ultra-Precision Machining Optical Precision Measurement

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 755
Author(s):  
Chen-Yang Zhao ◽  
Chi-Fai Cheung ◽  
Wen-Peng Fu
Keyword(s):  
Precision Measurement ◽  
Detection Algorithm ◽  
Surface Generation ◽  
Precision Machining ◽  
Tool Geometry ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Ultra Precision ◽  
Transition Points ◽  
Cutting Strategy

In this paper, an investigation of cutting strategy is presented for the optimization of machining parameters in the ultra-precision machining of polar microstructures, which are used for optical precision measurement. The critical machining parameters affecting the surface generation and surface quality in the machining of polar microstructures are studied. Hence, the critical ranges of machining parameters have been determined through a series of cutting simulations, as well as cutting experiments. First of all, the influence of field of view (FOV) is investigated. After that, theoretical modeling of polar microstructures is built to generate the simulated surface topography of polar microstructures. A feature point detection algorithm is built for image processing of polar microstructures. Hence, an experimental investigation of the influence of cutting tool geometry, depth of cut, and groove spacing of polar microstructures was conducted. There are transition points from which the patterns of surface generation of polar microstructures vary with the machining parameters. The optimization of machining parameters and determination of the optimized cutting strategy are undertaken in the ultra-precision machining of polar microstructures.

scholarly journals An unsupervised learning method for named entity relation extraction of space knowledge graph

2021 ◽  
Vol 1871 (1) ◽  
pp. 012051
Author(s):  
Zhanji Wei ◽  
Lingyong Huang ◽  
Gang Wan ◽  
Yao Mu ◽  
Yunxia Yin
Keyword(s):  
Unsupervised Learning ◽  
Relation Extraction ◽  
Knowledge Graph ◽  
Learning Method ◽  
Named Entity ◽  
Entity Relation Extraction

Study on Ultra-Precision Ball Surface Floating Polishing Kinematics Mechanism

2006 ◽  
Vol 532-533 ◽  
pp. 109-112
Author(s):  
Xun Lv ◽  
Ju Long Yuan ◽  
Dong Hui Wen ◽  
Qian Fa Deng ◽  
Fei Yan Lou
Keyword(s):  
Chemical Conversion ◽  
Processing Parameters ◽  
Precision Machining ◽  
High Tech ◽  
National Defense ◽  
Ball Surface ◽  
Angular Velocities ◽  
Ultra Precision ◽  
Relationship Of ◽  
The Mathematical Model

The high precision balls are requested in national defense, astronautics and high-tech commercial domain urgently. Conventional precision machining methods are sensitive to uniformity of abrasives and machining environment. After precision machining, there are easily to produce thick damaged layer on the ball surface because of machining stress and chemical conversion. On the basis of the floating polishing mechanism, a new scatheless ultra-precision polishing method of ball surface can solve the problems of abrasives uniformity effectively and damaged layer. In order to ensure that the new polishing method polishes ball surface equally, the appropriate angular velocities of the ball should be selected. This paper sets up the mathematical model about the motion of ball. By analyzing and simulating the relationship of the angular velocities, the best processing parameters are acquired.

scholarly journals Acoustic emission based tool contact detection for ultra-precision machining

CIRP Annals ◽  
2011 ◽  
Vol 60 (1) ◽  
pp. 141-144 ◽  
Author(s):  
S. Min ◽  
J. Lidde ◽  
N. Raue ◽  
D. Dornfeld
Keyword(s):  
Acoustic Emission ◽  
Precision Machining ◽  
Contact Detection ◽  
Ultra Precision

Influence of relative tool sharpness (RTS) on different ultra-precision machining regimes of Mg alloy

2018 ◽  
Vol 96 (9-12) ◽  
pp. 3545-3563 ◽  
Author(s):  
M. Azizur Rahman ◽  
Mustafizur Rahman ◽  
A. Senthil Kumar
Keyword(s):  
Mg Alloy ◽  
Precision Machining ◽  
Ultra Precision

Molecular dynamics simulation of ultra-precision machining 3C-SiC assisted by ion implantation

2021 ◽  
Vol 69 ◽  
pp. 398-411
Author(s):  
Houfu Dai ◽  
Yang Hu ◽  
Weilong Wu ◽  
Haixia Yue ◽  
Xiaosong Meng ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Ion Implantation ◽  
Dynamics Simulation ◽  
Precision Machining ◽  
Ultra Precision
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