Semi-Fixed Abrasive Machining for Plane Aluminium

2009 ◽  
Vol 416 ◽  
pp. 103-107 ◽  
Author(s):  
Ju Long Yuan ◽  
Jia Jie Chen ◽  
Zhi Wei Wang ◽  
Dong Qiang Yu
Keyword(s):  
Surface Roughness ◽  
Removal Efficiency ◽  
Ferrous Metal ◽  
Abrasive Machining ◽  
Metal Material ◽  
Comprehensive Performance ◽  
Paper Plane ◽  
Fixed Abrasive ◽  
Better Than

Aluminum is a non-ferrous metal material which has excellent comprehensive performance. It has been widely used in many sectors. In this paper, plane abrasive machining is carried out for the aluminum. The quality of the Al specimen’s surface is compared after the semi-fixed and loose abrasive processing. The experiment proved that semi-fixed abrasive machining is better than loose abrasive in reducing surface roughness of Al-blocks. In the semi-fixed abrasive machining, the surface roughness of Al-block continued to drop and become stable after 40 minutes. It can prevent deep scratches on Al-blocks’ surface effectively and can get a mirror effect. The surface roughness can reach to Ra 22nm, Rmax 490nm, Rv 130nm. Its removal efficiency is also higher than loose abrasive machining. It is proved that semi-fixed abrasive machining can take the place of rough polishing processing.

Observation in the Surface Roughness of Silicon Wafer during Semi-Fixed Abrasive Machining with Large Grains

2009 ◽  
Vol 69-70 ◽  
pp. 253-257
Author(s):  
Ping Zhao ◽  
Jia Jie Chen ◽  
Fan Yang ◽  
K.F. Tang ◽  
Ju Long Yuan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Silicon Wafer ◽  
Processing Parameters ◽  
Wafer Surface ◽  
Abrasive Machining ◽  
Fixed Abrasive ◽  
Is Failure ◽  
Better Than

Semi-fixed abrasive is a novel abrasive. It has a ‘trap’ effect on the hard large grains that can prevent defect effectively on the surface of the workpiece which is caused by large grains. In this paper, some relevant experiments towards silicon wafers are carried out under the different processing parameters on the semi-fixed abrasive plates, and 180# SiC is used as large grains. The processed workpieces’ surface roughness Rv are measured. The experimental results show that the surface quality of wafer will be worse because of higher load and faster rotating velocity. And it can make a conclusion that the higher proportion of bond of the plate, the weaker of the ‘trap’ effect it has. Furthermore the wet environment is better than dry for the wafer surface in machining. The practice shows that the ‘trap’ effect is failure when the workpiece is machined by abrasive plate which is 4.5wt% proportion of bond in dry lapping.

Surface Roughness and Morphology of Titanium Plate Ground with Fixed and Loose Brown Alumina Abrasives

2010 ◽  
Vol 126-128 ◽  
pp. 1019-1022
Author(s):  
Quan Li Han ◽  
Wen Ming Zhang
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Surface Defect ◽  
Abrasive Machining ◽  
Titanium Plate ◽  
Machining Time ◽  
Machining Force ◽  
Paper Plane ◽  
Fixed Abrasive ◽  
Better Than

Titanium is a metal material which has many excellent properties; it has been widely used in many fields. In this paper, plane abrasive machining is carried out for Titanium plate. The surface roughness and morphology of Ti-plate is compared after fixed and loose abrasive machining. The experiment proved that the drop magnitude of Ra in loose abrasives machining is great larger than that in fixed abrasive when grit size is nearly equal, and the improvement of surface defect such as some directional marks, deep scratch and bits in loose abrasives machining is rapider and quicker than that in fixed abrasives during same machining time. The results of experiments indicts that loose abrasive machining is better than fixed abrasive in reducing surface roughness and improving surface morphology, since the higher density of active abrasives and machining force uniformity.

Nano-Precision Finishing Technology Based on Magnetorheological Finishing

2009 ◽  
Vol 416 ◽  
pp. 118-122 ◽  
Author(s):  
Yao Ming Li ◽  
Xing Quan Shen ◽  
Ai Ling Wang
Keyword(s):  
Surface Roughness ◽  
Advanced Technology ◽  
Technological Parameters ◽  
Magnetorheological Finishing ◽  
Shape Precision ◽  
Surface Destruction ◽  
Series Of Experiments ◽  
Precision Finishing ◽  
Better Than

Surface roughness is normally regarded as an important criterion for assessing the quality of optic elements; surface roughness of a high-quality optic element is required to be less than RMS1nm. In this paper, a series of experiments has been conducted on the sample magnetorheological finishing machine by using self-prepared magnetorheological liquid as finishing liquid, to assess the removing efficiency of magnetorheological finishing. Optimization of technological parameters enables the authors to obtain a glass-ware with an ideal surface roughness of RMS0.56nm. Magnetorheological finishing (MRF) is an advanced technology for processing optic elements that has been developed in recent years. The technology polishes optic elements by using viscoplastic soft media produced by the MRF liquid under the variation of gradient magnetic field. Better than traditional polishing method in shape precision, surface roughness and inner surface destruction, MRF is an ideal technology for obtaining super-precision optic surface.

Fixed Abrasive Lapping and Polishing of Hard Brittle Materials

2010 ◽  
Vol 426-427 ◽  
pp. 589-592 ◽  
Author(s):  
Jun Li ◽  
Yong Wei Zhu ◽  
Dun Wen Zuo ◽  
Kui Lin ◽  
M. Li
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Removal Rate ◽  
Brittle Materials ◽  
Process Conditions ◽  
High Productivity ◽  
Fixed Abrasive ◽  
K9 Glass ◽  
Panel Glass

Fixed abrasive lapping and polishing (FALP) is a new machining technology and was adopted to manufacture hard brittle materials and obtain the high productivity because of fixed abrasive. The preparation process of fixed abrasive pad (FAP) was described. FALP of K9 glass, mobile panel glass and Si were investigated with fixed 5-10 µm diamond abrasives. The effect on material removal rate (MRR) and surface quality of different materials was studied. The results show that in the same FALP process conditions, Si is the highest MRR and reaches 4428 nm/min, mobile panel glass is inferior to and K9 glass is the lowest. And surface quality of mobile panel glass that surface roughness Sa is 2.10 nm and little and less damages is the best, Si is followed and K9 glass is the worst. So FALP can obtain the higher MRR and reaches several micrometers per minute and the better quality that surface roughness Sa can reach nanometer level for different materials.

The Surface Quality Experimental Analysis of Rotary Ultrasonic Machining

2013 ◽  
Vol 419 ◽  
pp. 348-354 ◽  
Author(s):  
Chao Liang Xu ◽  
Xiao Hua Tang ◽  
Tian Yu Xia
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Brittle Materials ◽  
Zirconia Ceramic ◽  
Ultrasonic Machining ◽  
Rotary Ultrasonic Machining ◽  
Ultrasonic Machine ◽  
Mechanical Machining ◽  
Better Than

Rotary ultrasonic machining (RUM) is widely used for machining virous kinds of hard-brittle materials. This article aims to study ultrasonic machining surface quality of zirconia ceramic, low-carbonsteel boltwith self-developed rotary ultrasonic machine. The surface roughness could be detected and observed by Taylor Hobson surface roughness instrument and Keyence microscope.The experimental resultsshow that the surface quality achieved by rotary ultrasonic machining is better than bytraditional mechanical machining. Rotary ultrasonic machininghas advantages for machining hard-brittle materials.

scholarly journals Performance of a new hybrid cutting-abrasive tool for the machining of fibre reinforced polymer composites

2020 ◽  
Author(s):  
Islam Shyha ◽  
Dehong Huo ◽  
Peyman Hesamikojidi ◽  
Hossam Eldessouky ◽  
Mahmoud Ahmed El-Sayed
Keyword(s):  
Surface Roughness ◽  
Single Point ◽  
Abrasive Machining ◽  
Frp Composites ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Sem Imaging ◽  
Carbide Inserts

AbstractA new hybrid cutting-abrasive machining tool (turn-grind) is detailed for high-quality machining of fibre reinforced polymer (FRP) composites, comprising single point carbide inserts electroplated with multi-layers of diamond abrasives 120 μm grain size, to form an abrasive region adjacent to an abrasive-free cutting edge. Experimental data are presented for turning tubes of CFRP and GFRP. The surface quality of workpieces after machining was evaluated through surface roughness measurements and SEM imaging. Cutting-only caused more defects such as delamination and fibre to pull out. Compared with cutting-only, contact and non-contact measurement of surface roughness (Ra) in both axial and radial directions showed an increase for CFRP and GFRP with roundness error reduced to 50%. No significant increase in cutting force was observed.

Grid-Based Task Scheduling PMTS Algorithm

2011 ◽  
Vol 121-126 ◽  
pp. 4491-4497 ◽  
Author(s):  
Jian Lin Qiu ◽  
Li Chen ◽  
Jian Ping Chen ◽  
Xiang Gu ◽  
Yan Yun Chen
Keyword(s):  
Quality Of Service ◽  
Task Scheduling ◽  
Load Balance ◽  
Time Span ◽  
Experimental Results ◽  
Economic Principle ◽  
Comprehensive Performance ◽  
Grid Based ◽  
Better Than

This paper analyses the Min-min algorithm and its improved algorithms through the performances of load balance, time span, quality of service and economic principle. Based on the analysis of the merits of these algorithms, we propose an improved algorithm as PMTS (Priority-based maximum time-span algorithm) by integrating. In the instance of the application, we analyse and compare the performances of these algorithms, and experimental results show that, PMTS algorithm is better than other algorithms in the comprehensive performance of load-balance, time-span, quality of service and other aspects.

scholarly journals Optimal design and experimental study of fixed abrasive pads based on coupling of damping regulation and pellet arrangement

2021 ◽  
Vol 12 (1) ◽  
pp. 97-108
Author(s):  
Chaoqun Xu ◽  
Congfu Fang ◽  
Yuan Li ◽  
Chong Liu
Keyword(s):  
Surface Roughness ◽  
Pressure Distribution ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Wafer Surface ◽  
Test Results ◽  
Workpiece Material ◽  
Fixed Abrasive

Abstract. Lapping and polishing technology is an efficient processing method for wafer planarization processing. The structure of the fixed abrasive pad (FAP) is one of the most concerning issues in the research. The FAP structure affects the pressure distribution on the wafer surface, and the pressure distribution during processing has a significant influence on the wafer surface. Therefore, in this paper, a better pressure distribution is obtained by adjusting the angle of the spiral arrangement and the damping distribution of the damping layer of the FAP, thereby obtaining better processing quality. Based on the above theory, a new type of FAP, with coupling between the arrangement of the pellets and the damping regulation of the damping layer, was designed and optimized. The machining effects of different FAPs on the workpiece surface are compared in terms of material removal rate, material removal thickness, and surface roughness. The test results show that the workpiece material removal rate is higher than that of the traditional FAP when using the optimized FAP. The non-uniformity of the optimized FAP for that of material removal was 4.034 µm, which was lower than the traditional FAPs by 24.4 % and 17.6 %, respectively. The average surface roughness, Ra, of the optimized FAP is 0.21 µm, which is lower than 19.1 % and 12.5 % of the two traditional FAPs, respectively. Therefore, workpiece material removal and distribution are more uniform, and the surface quality of the workpiece is better when the optimized FAP processing is used. The test results prove that the optimized pellet arrangement and damping can achieve a better surface quality of the workpiece, which can meet the precision lapping process requirements for high-quality surfaces and large-scale production of brittle and hard materials such as sapphire.

Effect of SC-1 Process Parameters on Particle Removal and Surface Metallic Contamination

1995 ◽  
Vol 386 ◽  
Author(s):  
R. Mark Hall ◽  
John J. Rosato ◽  
Taura Jarvis ◽  
Thad Parry ◽  
Paul G. Lindquist
Keyword(s):  
Surface Roughness ◽  
Removal Efficiency ◽  
Process Parameters ◽  
Etch Rate ◽  
Bath Temperature ◽  
Process Conditions ◽  
Particle Removal ◽  
Removal Efficiencies ◽  
Contamination Levels ◽  
Better Than

ABSTRACTThe effect of bath temperature, megasonic power, and NH4-OH:H2O ratio are studied for particle removal efficiency, surface roughness, and surface Fe concentration in SC-1 cleaning solutions. Experimental results are presented which show removal efficiencies better than 97% on bare silicon wafers for optimized process conditions. These results are related to the etch rate of thermal oxides and a model is developed for reducing surface roughness and minimizing Fe contamination levels while maximizing particle removal efficiency.

Slot Grinding of Advanced Ceramics with Brazed Diamond Cut-Off Wheels

2011 ◽  
Vol 175 ◽  
pp. 52-57
Author(s):  
Mei Chen ◽  
Feng Zhang ◽  
Jian Yun Shen ◽  
Hua Guo ◽  
Xi Peng Xu
Keyword(s):  
Surface Roughness ◽  
Silicon Nitride ◽  
Experimental Results ◽  
Advanced Ceramics ◽  
Abrasive Resistance ◽  
Wear Process ◽  
Grinding Ratio ◽  
Better Than

Based on the analysis of problems of diamond cut-off wheels used in slot grinding of ceramics at present, a brazed diamond cut-off wheel was produced and analyzed. Two typical advanced ceramics, alumina and silicon nitride, were used as the workpiece materials. In the experiments of slot grinding of ceramics, grinding ratio, wear process of the wheel and grinding quality of the work were studied. Experimental results showed that the brazed diamond cut-off wheel obtained good grinding ratio and abrasive resistance. The surface roughness of ground silicon nitride was better than that of alumina.

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