The Polishing Process of Cylindrical Rollers by Using a Double-Side Lapping Machine

2013 ◽  
Vol 589-590 ◽  
pp. 447-450 ◽  
Author(s):  
Wen Hua Zhou ◽  
Wei Feng Yao ◽  
Ming Feng ◽  
Bing Hai Lv ◽  
Qian Fa Deng
Keyword(s):  
Surface Quality ◽  
Cylindrical Surface ◽  
Smooth Surface ◽  
Great Influence ◽  
Working Life ◽  
Geometric Accuracy ◽  
Polishing Process ◽  
Rolling Bearings ◽  
Lapping Machine

The surface quality of cylindrical rollers has a great influence on the working life of rolling bearings. In the paper, double-side lapping machine and flannelette pads are applied to polish the cylindrical surface of rollers. After 20 min polishing, rollers with smooth surface are obtained and the roundness of the rollers have a improvement of about 0.3 μm, which means that the polishing process based on double-side lapping method can effectively improve the surface quality and geometric accuracy of cylindrical rollers.

scholarly journals Study on Flexible Polishing Force and Polishing Temperature of Flap Disc

2021 ◽  
Author(s):  
De Liu ◽  
Xiaoming Pan ◽  
Zhiyang Gu ◽  
Hui Qiu
Keyword(s):  
Surface Quality ◽  
Process Parameters ◽  
Great Influence ◽  
Contact Length ◽  
Polished Surface ◽  
Polishing Process ◽  
Influence Of Process Parameters ◽  
Polishing Force ◽  
Working Principle ◽  
Cutting Model

Abstract Polishing determines the final surface quality of the aero engine, which have great influence on its working performance and working life. By analyzing the structure and working principle of the flexible self-adaptive polishing platform of the blisk, the abrasive cutting model of the flap disc is established. The theoretical calculation of the effect of elastic deformation during the polishing process on the contact length of flap disc and blisk. The model of polishing force, polishing heat and temperature field during the polishing process of the flap disc are established and analyzed. Single factor method is used to analyze the influence of process parameters on polishing force, polishing temperature, roughness and specific polishing energy. Finally, the polishing test shows that the optimized process parameters improve the polished surface quality and meet the requirements of the blade polishing process.

A Study on Surface Quality of GaN with CMP Polishing Process

2011 ◽  
Vol 291-294 ◽  
pp. 1764-1767
Author(s):  
Wei Li ◽  
Ming Ming Ma ◽  
Bin Hu
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Gallium Nitride ◽  
Surface Quality ◽  
Chemical Reaction ◽  
Experimental Result ◽  
Precision Machining ◽  
Polishing Process

This paper introduced a polishing process for planarization of gallium nitride (GaN) wafer by polishing slurry that is made up by the chemical reaction with H2O2 solution and iron. Some different polishing parameters in the polishing process has been analyzed, which affect the surface quality of wafers, such as slurry particle size, polishing times, polishing slurry etc., and trying to improve the polishing process by optimization of the polishing parameters. The experimental result showed that this polishing method has an effect on the surface quality of GaN wafers, finally, the efficient and precision machining with surface roughness of GaN wafers of Ra0.81 nm has been gained by the CMP polishing process.

Super Polishing Behaviour Investigation of Stainless Steel Optical Lens Moulding Inserts

2009 ◽  
Vol 404 ◽  
pp. 97-102
Author(s):  
Kui Liu ◽  
S.T. Ng ◽  
K.C. Shaw ◽  
G.C. Lim
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Quality ◽  
Optical Quality ◽  
Polishing Process ◽  
Optical Lens ◽  
Fine Diamond ◽  
Diamond Paste ◽  
Quality Surface

Super polishing experiments were carried out to investigate the effects of polishing parameters on surface quality of stainless steel lens moulding inserts, and to optimize polishing conditions. Experimental results indicated that optical quality surface of stainless steel lens moulding inserts can be achieved through a two-step polishing process: fast polishing with a soft wood head and coarse diamond paste, and fine polishing with a nylon-covered steel ball head and fine diamond paste. A diameter of 20 mm stainless steel lens moulding insert with a surface roughness Ra of 7.6 nm has been successfully achieved using the two-step super polishing process.

An Approach to the Influence of Flotative Abrasive Balls on Polishing Process

2006 ◽  
Vol 532-533 ◽  
pp. 393-396 ◽  
Author(s):  
Yong Dai ◽  
Qian Fa Deng ◽  
Xun Lv ◽  
Ju Long Yuan ◽  
Xun Jie Yu
Keyword(s):  
Surface Roughness ◽  
Grain Size ◽  
Removal Rate ◽  
Great Influence ◽  
Work Piece ◽  
Polishing Process ◽  
Soft Contact ◽  
Ball Diameter ◽  
Experiment Device

Polishing with Flotative Abrasive Balls(FABs) is a kind of soft contact polishing means， and the conventional polishing plate and pad are not needed in this case. The pressure of polishing is the flotage which is the upward force that a fluid exerts on the FABs, but the movement of work piece is similar to that in conventional polishing, the removal rate and quality of polishing is influenced by FAB and its flotage. An experiment device is built up and two kinds of FAB are designed and produced. Some primary experiments are carried out in order to investigate the influences of the size of FABs on the removal rate and surface roughness in polishing with FABs. It is found from the experiments that the grain size and the layers of FAB may have great influence on the removal rate of polishing; the surface roughness is mainly decided by the ball diameter and the layers of FAB. The results of experiments are discussed and analyzed, it indicates that the efficiency and quality depend on flotage and the number of active grains when the velocity of workpiece is assigned.

Experimental Study on Csf/AZ91D Composite Using Extrusion Following Vacuum Infiltration Method

2010 ◽  
Vol 97-101 ◽  
pp. 382-385 ◽  
Author(s):  
Jun Tao Guan ◽  
Le Hua Qi ◽  
Li Zheng Su ◽  
Jian Liu
Keyword(s):  
Surface Quality ◽  
Great Influence ◽  
Extrusion Process ◽  
Vacuum Infiltration ◽  
Extrusion Temperature ◽  
Measuring System ◽  
Infiltration Process ◽  
Good Surface ◽  
Deformation Stages

10vol. % Csf/AZ91D composites were fabricated by extrusion following vacuum infiltration process with self-developed experimental device and measuring system. The relationships of load vs displacement during process and surface quality of composites at various extrusion temperatures were investigated. SEM microscope was used to observe the microstructure of fabricated composites. The experimental results showed that the extrusion process can be divided into three deformation stages. The extrusion temperature had a great influence on the maximum extrusion load. Based on proper infiltration parameters, a extruded bar with good surface quality was obtained at extrusion temperature of 420°C.

A Study of Double Sided Polishing Process for Ultra-Smooth Surface of Silicon Wafer

2006 ◽  
Vol 532-533 ◽  
pp. 472-475 ◽  
Author(s):  
Wei Li ◽  
Xiao Dong Hu ◽  
Yang Fu Jin ◽  
Gang Xiang Hu ◽  
Xiao Zhen Hu
Keyword(s):  
Silicon Wafer ◽  
Smooth Surface ◽  
Rotation Speed ◽  
Computer Control ◽  
Machining Process ◽  
Computer Control System ◽  
Polishing Process ◽  
Surface Machining ◽  
Finishing Process

Double sided polishing process has become a main machining method for silicon wafer finishing process, but it is difficult to get ultra-smooth surface with the very stringent machining conditions. In this paper, the mechanism of ultra-smooth surface machining process was studied, the main parameters affecting the surface quality of silicon wafer, such as the polishing pad and carrier rotation speed, polishing press, polishing slurries etc. , were discussed and optimized, then ultra-smooth surface of silicon wafer with Ra 0.4nm has been obtained based on the above study. A new double sided polishing machine with computer control system equipped with a digital controlled press valve was developed, and the ultra-smooth machining process of silicon wafer was established in this paper.

scholarly journals Investigation of the Effect of Vibration Characteristics on the Grinding Performance of Aero-Engine Blade Tip

2021 ◽  
Author(s):  
Wei Li ◽  
Qidi Chen ◽  
Jian Wu ◽  
Mingjia Liu ◽  
Yinghui Ren ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Great Influence ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Aero Engine ◽  
Engine Blade ◽  
Blade Tip ◽  
The Difference

Abstract The machining quality of the blade tip has a great influence on the service performance and life of the aero-engine blade. The recent paper investigates the effect of vibration during the grinding process of the GH4169 nickel-based superalloy blade tip. Moreover, this paper proposes a theoretical model to link the unbalance of the grinding wheel, the vibration, and the surface topography characteristics of the blade. The results show that the blade vibration during grinding and the resulting non-linear change of the grinding depth could reduce the surface quality of the blade tip, and lead to differences in the surface quality of the blade tip in different areas, where the surface roughness in the entry area zone I is the largest, in the exit area zone III is the second largest, and the intermediate area zone III is the smallest. Grinding depth has a greater impact on the difference of the surface quality in the blade tip grinding process, especially when the grinding depth is greater than 4 μm, the difference of surface roughness increases significantly. On the other hand, the feed rate has little effect on the difference in surface quality. Adding damping block can reduce the surface roughness of the blade tip, however, it does not reduce the difference in surface quality.

The Effect of Speed Matching on the CMP Uniformity

2011 ◽  
Vol 189-193 ◽  
pp. 4154-4157 ◽  
Author(s):  
Zhi Xue Guo ◽  
Jing Zhai ◽  
Hui Zhang ◽  
Qing Zhong Li
Keyword(s):  
Relative Motion ◽  
Great Influence ◽  
Speed Ratio ◽  
Polishing Process ◽  
Polishing Pad ◽  
Chemical Mechanical Polishing Process ◽  
Relationship Of ◽  
The Mathematical Model ◽  
The Relationship

In the chemical mechanical polishing process, the relationship of relative motion of polishing pad and polishing head plays very important role for CMP quality. This paper established the mathematical model in order to investigate the relative motion of polishing pad and polishing head. It was found that the speed ratio of polishing pad and polishing head shows great influence on the CMP uniformity. And when the value of speed ratio of relative rotation approaches 1.23, the distribution of abrasives’ trajectories is close and uniform. Theoretically, the surface quality of workpiece is better.

scholarly journals Выглаживание поверхности антимонида галлия

2020 ◽  
Vol 46 (23) ◽  
pp. 48
Author(s):  
Р.В. Левин ◽  
И.В. Федоров ◽  
А.С. Власов ◽  
П.Н. Брунков ◽  
Б.В. Пушный
Keyword(s):  
Surface Quality ◽  
Annealing Time ◽  
Smooth Surface ◽  
Annealing Conditions ◽  
First Time

For the first time, the results of a study of the conditions for obtaining an atomically smooth surface of GaSb substrates are presented. It is shown experimentally that it is possible to improve the surface quality of the samples by changing the annealing conditions. The lowest obtained roughness of 1.27 nm was obtained at an annealing time of 16 minutes at a temperature of 650°C in the flow of TMSb and H2.

scholarly journals Problems of blackening of steel parts in technical practice

2018 ◽  
Vol 244 ◽  
pp. 01012 ◽  
Author(s):  
Sylvia Kuśmierczak ◽  
Martin Makovský
Keyword(s):  
Electron Microscopy ◽  
Surface Quality ◽  
Complex Analysis ◽  
Light And Electron Microscopy ◽  
Great Influence ◽  
Production Flow ◽  
Degradation Processes ◽  
Technical Practice ◽  
Surface Oxides

Problems of degradation are mainly solved in finished products, in a number of cases it is manifested during production. A great influence on the degradation processes of the products has the surface quality and surface finish. The article deals with the problem of blackening of steel, which has been treated with alkaline blackening. The throttle shaft made of automatic steel will be analyzed. Degradation was manifested by a change in surface quality after alkaline blackening. The methods of light and electron microscopy in combination with complex analysis of production flow and technology conditions were used for analysis. Based on the results of analyzes it was found that the degradation processes are closely related to the quality of preparation of the surface. Owing to the incorrect pretreatment of the surface, oxides occurred locally. At the sites of oxides, after alkaline blackening, the surface layer was peeled off, resulting in deterioration in the quality of the product.

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