Magnetorheological Flexible Gasbag Polishing Technique

2009 ◽  
Vol 416 ◽  
pp. 583-587 ◽  
Author(s):  
Shi Ming Ji ◽  
Ming Sheng Jin ◽  
Li Zhang ◽  
Qiao Ling Yuan ◽  
Xian Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Surface Quality ◽  
Rheological Behavior ◽  
Magnetic Field Effect ◽  
Control Unit ◽  
Pressure Control ◽  
Free Form ◽  
Structural Parameter ◽  
The Relationship

Combining the advantages of rheological behavior of magnetorheological fluid (MRF) and flexibility adjustability of rubber gasbag, a magnetorheological flexible gasbag polishing technique applied to free-form mould is proposed. With the development of robotic gasbag polishing technique, the flexibility of rubber gasbag can be adjusted by three methods of changing its internal pressure controlled through a pressure control unit, its own material property and structural parameter, and the rheological behavior of MRF inside of it in response to the application of an alterable magnetic field. Effect of rheological behavior to the flexibility of rubber gasbag and surface quality of mould is the single most important focus in this paper. The magnetorheological flexible gasbag polishing system is established and rheological behavior of MRF with magnetic field is described. Through polishing experiment focusing on the relationship between the surface roughness and current around electromagnetic coil, it can be obtained that magnetorheological flexible gasbag polishing technique is effective to improve surface quality when increasing current around coil in certain extent.

scholarly journals Analysis of the surface quality of polycaprolactam 3D prints enriched with carbon and glass fiber

2021 ◽  
Vol 338 ◽  
pp. 01005
Author(s):  
Damian Dzienniak ◽  
Jan Pawlik
Keyword(s):  
Glass Fiber ◽  
Surface Quality ◽  
Fused Deposition Modeling ◽  
Polyamide 6 ◽  
Fiber Glass ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
The Impact ◽  
The Relationship

Additive manufacturing has been gaining popularity and availability year by year, which has resulted in its dynamic development. The most common 3D printing method as of today, FDM (Fused Deposition Modeling), owing to its peculiarity, does not always guarantee producing objects with low surface roughness. The authors of the present article have taken on the analysis of the impact of FDM printing on the roughness of the filament thus processed. They also investigate the relationship between the roughness of the unprocessed filament (made of polycaprolactam, that is, polyamide 6 or PA6) with admixtures of other materials (carbon fiber, glass fiber) and the surface quality of the manufactured object. The main subject of the analysis is the side surfaces of 3D prints, as it is their quality that is usually directly dependent on many factors connected with the process of the laying of the consecutive layers. The authors check step by step whether there exists a pronounced relationship between the roughness of the original filament material and the roughness of the obtained surface.

An Empirical Perspective on Visual Icon Design

1998 ◽  
Vol 42 (5) ◽  
pp. 448-451
Author(s):  
Andrew Sears ◽  
Julie A. Jacko ◽  
Byron Brewer ◽  
Lylliam D. Robelo
Keyword(s):  
Primary Objective ◽  
Free Form ◽  
Perceived Effectiveness ◽  
Frequency Of Use ◽  
Secondary Objective ◽  
Empirical Perspective ◽  
Graphic Image ◽  
Iconic Representations ◽  
The Relationship

The primary objective of this study is to evaluate two methods for assessing the quality of iconic representations of computer functionality. A secondary objective is to explore the relationship between frequency of use of specific computer functions and icon usage. These objectives were accomplished by investigating the identifiability, perceived effectiveness, and frequency of use of 34 icons used in the standard and formatting toolbars of Microsoft® Word 7.0. More specifically, our data provide information regarding the perceived effectiveness of the iconic representation given its associated functionality, free-form recall of associated functionality given only the icon, frequency of use of the functionality (either by access through the icon or the menu) and frequency of icon use. To accomplish our objectives, we constructed and administered a four-part survey to 353 volunteers. The results compose the first empirically documented evidence that icon use is not merely a function of how frequently users access the functionality the icon is designed to represent. The results also suggests that the ability of users to correctly identify the functionality of an icon given only the graphic image may be an effective method of evaluating the quality of alternative icon designs.

scholarly journals Numerical Simulation of Arc and Metal Transfer in Arc Welding Based Additive Manufacturing Assisted by External Longitudinal Static Magnetic Field

2020 ◽  
Author(s):  
Xiangman Zhou ◽  
Lian Liu ◽  
Boyun Wang ◽  
Xingwang Bai ◽  
Haiou Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Additive Manufacturing ◽  
Surface Quality ◽  
Molten Metal ◽  
Arc Welding ◽  
Molten Pool ◽  
Electromagnetic Stirring ◽  
Single Bead ◽  
Valley Area

Abstract The surface quality is one of important quality factors for arc welding based additive manufacturing (AWAM) parts. In this study, AWAM process assisted by an external longitudinal static magnetic field (ELSMF) is applied to improve surface quality of AWAM parts. In order to study the internal mechanism of AWAM process assisted by an external longitudinal magnetic field, a three-dimensional weak coupling model of the arc and metal transport is developed to simulate the arc, molten pool dynamic in AWAM assisted by ELSMF. The simulated results of single-bead deposition show that the ELSMF induces the asymmetrical tangential electromagnetic stirring in arc and molten pool, which can increase molten pool dynamics, drive the molten metal moving to the edge of the molten pool and reduce the temperature gradient. The simulated results of overlapping deposition show that the asymmetrical tangential electromagnetic stirring force can drive the molten metal moving to valley area between overlapping beads, which is beneficial to filling the valley area and improving the surface quality of the AWAM parts. The single-bead deposition experiment shows that the applying of ELSMF can reduce the height as well as increase the width of single weld bead. The multi-bead overlapping and the multi-layer multi-pass deposition experiments demonstrate that the external magnetic field can improve the surface quality of multi-layer part. The conclusions of the above study can provide the reference for AWAM process assisted by magnetic field.

scholarly journals Pseudo-random Path Generation Algorithms and Strategies for the Surface Quality Improvement of Optical Aspherical Components

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1216
Author(s):  
Jun Zha ◽  
Hangcheng Zhang ◽  
Yipeng Li ◽  
Yaolong Chen
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Path Generation ◽  
Optical Components ◽  
Validation Experiment ◽  
Polishing Path ◽  
Computer Controlled Optical Surfacing ◽  
The Relationship ◽  
Convolution Effect

This study proposes two path generation algorithms to diminish the superposition of the convolution effect on the polishing path in computer-controlled optical surfacing. According to the polishing of aluminum-alloy based hyperboloid optical components, different proportions of polishing agents were blended. Then, the surface roughness of the optical components were determined through a validation experiment of the algorithms. Furthermore, the relationship between surface roughness and the polishing agent concentration, and the compensation strategies for surface roughness were analyzed. The results show that the two algorithms effectively compensated for surface waviness. The findings support the strategies for improving the surface quality of optical components with aspherical surfaces.

scholarly journals A Proposed Scan Strategy Used on SLM Inner Structure Part

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 937 ◽  
Author(s):  
Jitai Han ◽  
Meiping Wu ◽  
Weipeng Duan
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Laser Energy ◽  
Side Surface ◽  
Test Results ◽  
New Strategy ◽  
Optimal Surface ◽  
The Relationship ◽  
Main Factor

A model with an inner structure was designed to study the relationship between the surface quality of the inner structure and the scan strategy in this study. The test results showed that the precision of the inner structure was highly affected by the scan strategy, and the specimens printed using different strategies showed different performances on the surface quality of the inner structure. The specimen printed using the square-framed scan strategy had a lower flatness value on the positive face of the inner structure compared to that of the other two specimens printed using Z-shape scan strategies, while the specimen printed using the Z-shape scan strategy (along the inner structure) had a relative optimal surface roughness on the side surface of the inner structure in all three specimens. The bending deformation caused by the scan strategies was considered to be the main factor affecting the flatness on the positive surface, while laser energy fluctuation showed a significant impact on side surface roughness. Combined with the experimental data, a new scan strategy was proposed; we found that the specimen printed using this new strategy improved positive surface flatness and side surface roughness.

SIMULATION ON THE GROUND WAFER SHAPE IN WAFER ROTATIONAL GRINDING

2011 ◽  
Vol 10 (01) ◽  
pp. 175-182
Author(s):  
KEYAN TANG ◽  
RENKE KANG
Keyword(s):  
Surface Quality ◽  
Silicon Wafer ◽  
Pitch Angle ◽  
Porous Ceramic ◽  
Processing Parameters ◽  
Simulation System ◽  
Mathematics Model ◽  
Simulation Results ◽  
The Relationship

During the wafer rotational grinding, the wafer is located on a porous ceramic vacuum chuck, so there are many factors that can affect the wafer shape in the process of the wafer grinding. The wafer shape has an important influence on the surface quality of the silicon wafer and it will be greatly different if the processing parameters are different. So in this paper, based on a mathematics model of the ground wafer shape which has been developed, a simulation system of the wafer shape was made out by using Visual C++ and OpenGL. The relationship between the parameters and the wafer shape was researched and analyzed. The simulation results showed that the roll angle and the pitch angle had the greatest impact on the wafer shape. And the simulation results with different parameters have been compared with each other for the final conclusions. So the results demonstrate the mathematics model is reasonable and the simulation system is of high simulating accuracy, and the ground wafer shape can be predicted very well by it. The research results are significant to logically choose the wafer grinding parameters and effectively control the ground wafer shape.

Investigation on the relationship between bending angle of the overhanging surface and overhanging surface quality printed using selective laser melting

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Weipeng Duan ◽  
Jitai Han ◽  
Qingfneg Xia ◽  
Keqing Wang ◽  
Meiping Wu ◽  
...  
Keyword(s):  
Surface Quality ◽  
Molten Pool ◽  
Bending Angle ◽  
Content Type ◽  
Factors Affecting ◽  
Overall Performance ◽  
Increasing Demand ◽  
The Relationship ◽  
Bending Angles

Purpose With the increasing demand for lightweight parts, the quality of the inner structure gained growing attention from different kinds of fields. As the quality of the overhanging surface was one of the most important factors affecting inner structure formation, its quality still needs to improve. This paper aims to clarify the change of the overhanging surface quality caused by different bending angles. Design/methodology/approach The structure of the inner hole was redesigned according to the different performances of the overhanging and side inner surface. The experimental results revealed why different surface qualities can be seen under different bending angles. According to the experimental data, the inner structure was redesigned to increase its overall performance. Findings The results revealed that when the bending angle was small, the slope of the overhanging surface increased which lead to the decreasing length of the powder-supported layer. However, less space on bending angle resulted in the accumulation of unmelted powder which leads to the increasing of sinking distance. When the bending angle was too large, the slope of the overhanging surface decreased and the length of the molten pool which was supported by powder increased. It resulted in the sinking of the molten pool caused by the gravity of powder and its attachment. Originality/value This paper is the first work to study the relationship between bending angle and overhanging surface quality as far as the authors know. The different performances of left and right overhanging surfaces also have not been revealed in other research studies to the best of the knowledge.

The Influence of Electric Parameters on the Surface Quality of Ceramic in Internal Grinding Using the Ultrasonic and ELID Composite Grinding

2014 ◽  
Vol 596 ◽  
pp. 47-51 ◽  
Author(s):  
You Yi Zheng ◽  
Hao Pang ◽  
Qi You ◽  
Xiao Feng Jia
Keyword(s):  
Oxide Film ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Electrical Parameters ◽  
Diamond Grinding Wheel ◽  
Internal Grinding ◽  
Electric Parameters ◽  
The Relationship ◽  
Selection Of

Analyzed the relationship between electrical parameters of the ultrasonic and electrolytic in-process dressing (ELID) composite grinding and the surface quality of the ceramic through the experiment. The value of the voltage and the current were recored by labview and the surface quality of the ceramic was tested using Talysurf CCI 6000 In the experiment. The results show that the selection of electrical parameters affects the electrolysis speed of diamond grinding wheel and the speed of the oxide film formed and the quality of the oxide film, and then affects the grinding performance of the grinding wheel and the grinding quality of workpiece.

Research on the effect of coverage rate on the surface quality in laser direct writing process

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744018
Author(s):  
Xuetao Pan ◽  
Dawei Tu
Keyword(s):  
Surface Quality ◽  
Quality Characteristic ◽  
Direct Writing ◽  
Two Photon ◽  
Scanning Step ◽  
Analytic Expressions ◽  
Simulation And Experiment ◽  
The Mathematical Model ◽  
The Relationship

Direct writing technique is usually used in femtosecond laser two-photon micromachining. The size of the scanning step is an important factor affecting the surface quality and machining efficiency of micro devices. According to the mechanism of two-photon polymerization, combining the distribution function of light intensity and the free radical concentration theory, we establish the mathematical model of coverage of solidification unit, then analyze the effect of coverage on the machining quality and efficiency. Using the principle of exposure equivalence, we also obtained the analytic expressions of the relationship among the surface quality characteristic parameters of microdevices and the scanning step, and carried out the numerical simulation and experiment. The results show that the scanning step has little influence on the surface quality of the line when it is much smaller than the size of the solidification unit. However, with increasing scanning step, the smoothness of line surface is reduced rapidly, and the surface quality becomes much worse.

Sign in / Sign up

Export Citation Format

Share Document