Investigation of Abrasive Super Finishing under Various Paths with a 5-Axis Closed-Link Compact Robot and Fine Diamond Stone

2016 ◽  
Vol 1136 ◽  
pp. 472-477
Author(s):  
Tao Liu ◽  
Takashi Kure ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Yu Dong Liu
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Glass Plate ◽  
Robot Arm ◽  
Stick Slip ◽  
Fine Diamond ◽  
Polishing Force ◽  
Abrasive Stone ◽  
Fixed Abrasive ◽  
Polishing Pressure

To reduce the environmental impact of abrasive polishing, we investigated fixed-abrasive polishing using a compact robot. We used a five-joint closed-link compact robot with a fine diamond stone on the main axis to polish a glass plate and measured the polishing pressure and polishing force. We analyzed the stick-slip vibration of a glass polishing motion due to the low stiffness of the robot arm and estimated the influence of relative speed changes on the friction coefficient between the glass plate and the abrasive stone. We also used various paths to polish the workpiece to examine the characteristics of the polishing equipment. Based on the results, we proposed a method that can estimate a workpiece's surface roughness based on the friction coefficient. Using the compact robot and a fine diamond stone, the workpiece's surface roughness decreased and polishing processes on the glass plate were more stable.

Investigation of Glass Polishing Motion Based on Micro-Oscillating Pressing Force with a Compact Robot and Fine Diamond Stone

2014 ◽  
Vol 1017 ◽  
pp. 129-134
Author(s):  
Wei Wu ◽  
Yu Dong Liu ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama
Keyword(s):  
Glass Plate ◽  
Voice Coil Motor ◽  
Robot Arm ◽  
Chatter Vibration ◽  
Pressing Force ◽  
Fine Diamond ◽  
Low Stiffness ◽  
Abrasive Stone ◽  
Fixed Abrasive ◽  
Glass Polishing

To reduce the environmental impact of abrasive polishing, we have investigated using a compact robot and fixed-abrasive polishing. We look at a five-joint closed-link compact robot with a fine diamond stone on its main axis to polish a glass plate. In this method, we measured the chatter vibration in glass polishing motion due to the low stiffness of the robot arm. Therefore, we estimated a dynamic characteristic of the robot arm by a hammering test and measured the friction coefficient between the glass plate and the abrasive stone. From these results, we attempted a novel polishing method to prevent its self-vibration using micro-oscillating pressing force with a voice coil motor. As a result, the proposed method of polishing a glass plate with a compact robot and a fine diamond stone was found to be effective.

Influence of Polishing and Pressing Force on the Material Removal Rate in Fixed Abrasive Polishing with Compact Robot

2012 ◽  
Vol 565 ◽  
pp. 243-248 ◽  
Author(s):  
Masaki Niwa ◽  
Sachiko Ogawa ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Yoshiaki Onchi
Keyword(s):  
Friction Coefficient ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Glass Plate ◽  
Pressing Force ◽  
Constant Area ◽  
Polishing Force ◽  
Fixed Abrasive ◽  
Polishing Pressure

To help reduce the environmental impact of abrasive polishing, we have investigated the use of a compact robot and fixed-abrasive polishing. We used a five-joint closed-link compact robot with a fine diamond stone on its main axis to polish the glass plate and measured the polishing pressure(=pressing force/stone constant area), the polishing force, and the material removal rate. From these results, we investigated the relationship between the polishing pressure and the polishing force and between the polishing pressure and the material removal rate. We found that there is an interesting relationship between the polishing pressure and polishing force, which is not simply proportional but exponential, that the friction coefficient(=polishing force/pressing force) increases as the polishing pressure increases, and that by focusing on the friction coefficient, we can estimate the material removal rate.

Experimental Research of the Elastic Abrasive Tool Used for Finishing Mould Surface

2011 ◽  
Vol 101-102 ◽  
pp. 998-1001
Author(s):  
Gui Lian Wang ◽  
Yi Qiang Wang ◽  
Hai Bo Zhou ◽  
Bing Bing Yan
Keyword(s):  
Surface Roughness ◽  
High Efficiency ◽  
Free Form ◽  
Abrasive Tool ◽  
Good Surface ◽  
Mould Surface ◽  
Polishing Force ◽  
Polishing Path ◽  
Good Surface Roughness ◽  
Polishing Pressure

A compliant abrasive tool is investigated in this paper. By the polishing experiment of this abrasive tool, the technique of polishing the large mould free-form surface is acquired. The polishing experiments about the elastic abrasive tool are carried out, which indicates that the abrasive tool has the advantages of the high efficiency, the elasticity and compliant performance. The relation of the deflection and polishing force is investigated and it is concluded that they is approximately linearity. The effect of polishing pressure on the surface roughness is researched by experiment. Polishing quality for the edge of abrasive tool was investigated and presented. These experiment results provide significant foundation for planning polishing path and controlling process parameters to achieve good surface roughness and high efficiency in the next research.

Influence of surface roughness, friction coefficient, and wrap angle on clinching joint strength and its correlation with belt friction phenomenon

2021 ◽  
pp. 135065012110253
Author(s):  
Santosh Kumar ◽  
Vimal Edachery ◽  
Swamybabu Velpula ◽  
Avinash Govindaraju ◽  
Sounak K. Choudhury ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Joint Strength ◽  
Joint Interface ◽  
Cross Sectional ◽  
Lap Shear ◽  
Mathematical Correlation ◽  
Mechanical Clinching ◽  
Wrap Angle

Clinching is an economical sheet joining technique that does not require any consumables. Besides, after its usage, the joints can be recycled without much difficulty, making clinching one of the most sustainable and eco-friendly manufacturing processes and a topic of high research potential. In this work, the influence of surface roughness on the load-bearing capacity (strength) of joints made by the mechanical clinching method in cross-tensile and lap-shear configuration is explored. Additionally, a correlating mathematical model is established between the joint strength and its surface parameters, namely, friction coefficient and wrap angle, based on the belt friction phenomenon. This correlation also explains the generally observed higher strength in lap-shear configuration compared to cross-tensile in clinching joints. From the mathematical correlation, through friction by increasing the average surface roughness, it is possible to increase the strength of the joint. The quality of the thus produced joint is analyzed by cross-sectional examination and comparison with simulation results. Experimentally, it is shown that an increment of >50% in the joint strength is achieved in lap-shear configuration by modifying the surface roughness and increasing the friction coefficient at the joint interface. Further, the same surface modification does not significantly affect the strength in cross-tensile configuration.

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.

Research on Modeling Method of Runway Frictional Coefficient Measuring Vehicle Based on Impedance Diagrams

2011 ◽  
Vol 214 ◽  
pp. 133-137 ◽  
Author(s):  
Xu Dong Shi ◽  
Shou Wen Shi ◽  
Lu Zhang ◽  
Jian Li Li
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Measurement Data ◽  
Frictional Coefficient ◽  
Modeling Method ◽  
Measuring System ◽  
Discrete Fourier Transformation ◽  
Measuring Error ◽  
Impedance Diagram ◽  
Airport Runway

Airport runway friction coefficient is an important parameter to evaluate the quality of runway which is usually measured by runway friction coefficient measuring vehicle. In order to reduce the airport runway friction coefficient measuring error which comes from runway vibration caused by road roughness and vehicle its own structural characteristics, an impedance diagram is used to model the suspending system and measuring system of the measuring vehicle. The power spectral density of pavement and inverse discrete Fourier transformation are introduced to model runway surface roughness as excitation input. The rationality of the stimulating established model is validated by comparing with an airport runway surface roughness measurement data. Runway friction coefficient measuring vehicle′s measuring error can be reduced and the measurement accuracy can be improved by using the impedance diagram modeling method.

The Relation Between the Friction of Lubricated Rough Surfaces and Apparent Normal Pressure

1989 ◽  
Vol 111 (2) ◽  
pp. 260-264 ◽  
Author(s):  
P. Lacey ◽  
A. A. Torrance ◽  
J. A. Fitzpatrick
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Slip Line ◽  
Field Model ◽  
Rough Surfaces ◽  
Normal Pressure ◽  
Line Field ◽  
Slip Line Field ◽  
Asperity Contacts

Most previous studies of boundary lubrication have ignored the contribution of surface roughness to friction. However, recent work by Moalic et al. (1987) has shown that when asperity contacts can be modelled by a slip line field, there is a precise relation between the friction coefficient and the asperity slope. Here, it is shown that there is also a relation between the friction coefficient and the normal pressure for rough surfaces which can be predicted from a development of the slip line field model.

Force Measurement and Analysis for Magnetic Field–Assisted Finishing

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Vasishta Ganguly ◽  
Tony Schmitz ◽  
Arthur Graziano ◽  
Hitomi Yamaguchi
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Material Removal ◽  
Force Measurement ◽  
Removal Rate ◽  
Iron Particle ◽  
Free Form ◽  
Total Force ◽  
Polishing Force ◽  
Free Form Surfaces

Magnetic field–assisted finishing (MAF) is used to polish free-form surfaces. The material removal mechanism can be described as a flexible “magnetic brush” that consists of ferromagnetic particles and abrasives that arrange themselves in the working gap between the magnet and the workpiece. Relative motion between the brush and the workpiece causes microcutting and improves surface finish. In this study, the contributions of the magnetic and polishing force components to the total force were evaluated. The effect of varying the polishing conditions, such as the working gap and the size of the ferromagnetic iron particles, on polishing forces, surface roughness, and material removal rate was also analyzed. It was observed that the polishing forces varied considerably with working gap. Also, the iron particle size was found to have a strong relation to the rate at which the surface roughness improved. Surface roughness values of 2–3 nm were achieved.

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