On the Development of an Experimental Testing Platform for the Vortex Machining Process

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Stephen C. Howard ◽  
Jacob W. Chesna ◽  
Stuart T. Smith ◽  
Brigid A. Mullany
Keyword(s):  
Material Removal ◽  
Closed Loop ◽  
Experimental Testing ◽  
Machining Process ◽  
Gaussian Shape ◽  
Workpiece Surface ◽  
Loop Control ◽  
Height Control ◽  
Stability Issues ◽  
Process Controls

The development of an experimental platform for studying Vortex Machining is presented. This process uses oscillating probes to generate localized vortices in polishing slurry in a region near to a workpiece surface. These vortices create material removal footprints having lateral dimensions typically measuring tens of micrometers. From studies of the process variables and subsequent machining footprints a number of process controls have been implemented and are discussed herein. These include a localized metrology frame to control specimen to probe position, coarse-fine translation axes for submicrometer motion control, closed-loop control of probe oscillation, and a slurry height control system. To illustrate the fidelity of these additional controls, the evolution from early machining footprints to the recent production of footprint arrays are presented. While process stability issues remain, machining footprints of near Gaussian shape having dimensions of 10–20 μm diameter and 40 nm depth after machining for 30 min can be reproduced.

scholarly journals Influence of a closed-loop controlled laser metal wire deposition process of S Al 5356 on the quality of manufactured parts before and after subsequent machining

2021 ◽  
Author(s):  
Dina Becker ◽  
Steffen Boley ◽  
Rocco Eisseler ◽  
Thomas Stehle ◽  
Hans-Christian Möhring ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Closed Loop ◽  
Deposition Process ◽  
Metal Wire ◽  
Machining Process ◽  
Machining Processes ◽  
Initial State ◽  
Additive Process ◽  
Shape Accuracy ◽  
Loop Control

AbstractThis paper describes the interdependence of additive and subtractive manufacturing processes using the production of test components made from S Al 5356. To achieve the best possible part accuracy and a preferably small wall thickness already within the additive process, a closed loop process control was developed and applied. Subsequent machining processes were nonetheless required to give the components their final shape, but the amount of material in need of removal was minimised. The effort of minimising material removal strongly depended on the initial state of the component (wall thickness, wall thickness constancy, microstructure of the material and others) which was determined by the additive process. For this reason, knowledge of the correlations between generative parameters and component properties, as well as of the interdependency between the additive process and the subsequent machining process to tune the former to the latter was essential. To ascertain this behaviour, a suitable test part was designed to perform both additive processes using laser metal wire deposition with a closed loop control of the track height and subtractive processes using external and internal longitudinal turning with varied parameters. The so manufactured test parts were then used to qualify the material deposition and turning process by criteria like shape accuracy and surface quality.

scholarly journals An Approach to Sustainable Metrics Definition and Evaluation for Green Manufacturing in Material Removal Processes

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 373 ◽  
Author(s):  
César Ayabaca ◽  
Carlos Vila
Keyword(s):  
Balanced Scorecard ◽  
Environmental Sustainability ◽  
Product Life Cycle ◽  
Material Removal ◽  
Experimental Testing ◽  
Green Manufacturing ◽  
Machining Process ◽  
Process Indicators ◽  
Definition Of ◽  
High Level

Material removal technologies should be thoroughly analyzed not only to optimize operations but also to minimize the different waste emissions and obtain cleaner production centers. The study of environmental sustainability in manufacturing processes, which is rapidly gaining importance, requires activity modeling with material and resource inputs and outputs and, most importantly, the definition of a balanced scorecard with suitable indicators for different levels, including the operational level. This paper proposes a metrics deployment approach for the different stages of the product life cycle, including a conceptual framework of high-level indicators and the definition of machining process indicators from different perspectives. This set of metrics enables methodological measurement and analysis and integrates the results into aggregated indicators that can be considered for continuous improvement strategies. This approach was validated by five case studies of experimental testing of the sustainability indicators in material removal operations. The results helped to confirm or modify the approach and to adjust the parameter definitions to optimize the initial sustainability objectives.

Laser Induced Plasma Micro-Machining

2010 ◽  
Author(s):  
Kumar Pallav ◽  
Kornel F. Ehmann
Keyword(s):  
Tool Wear ◽  
Material Removal ◽  
Machining Process ◽  
Micro Edm ◽  
Micro Machining ◽  
Workpiece Surface ◽  
Laser Induced Plasma ◽  
New Process ◽  
Explosive Expansion ◽  
Edm Process

A new micro-machining process that is motivated by the need to overcome the various limitations associated with the micro-EDM (μ-EDM) process is introduced. The limitations in μ-EDM are primarily due to the requirement of a conductive electrode and workpiece, tool wear, and complex wear compensation strategies. The new process, termed “laser-induced plasma micro-machining” uses a laser beam to generate plasma in a dielectric near the workpiece surface whose explosive expansion results in material removal by mechanisms similar to those that occur in μ-EDM.

Development of a New BCB ELID Lapping Process

2010 ◽  
Vol 154-155 ◽  
pp. 1739-1743
Author(s):  
Wei Li ◽  
Qian Jun Tian
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Surface Condition ◽  
Machining Process ◽  
Wheel Surface ◽  
Abrasive Wheel ◽  
Workpiece Surface

In this paper, the mechanism of Electrolysis In-process Dressing (ELID) lapping process using new BCB (bamboo charcoal bonded) abrasive wheel is researched. Some experiments of machining for silicon wafers were carried out for exploring the effect of some machining process parameters on material removal rate and surface roughness. Experiments show that: Material removal rate and machined workpiece surface roughness are increased with increase of the lapping wheel’s rotation speed and processing loading; The machined workpiece surface quality is affected with the lapping wheel surface condition, due to the abrasives are trued by electrolysis dressing in the lapping process, therefore the BCB lapping wheel always keeps better machining condition to obtain excellent machined workpiece surface quality efficiently.

In-Process and On-Machine Measurement of Machining Accuracy for Process and Product Quality Management: A Review

2014 ◽  
Vol 8 (1) ◽  
pp. 4-19 ◽  
Author(s):  
Yasuhiro Takaya ◽  
Keyword(s):  
Quality Management ◽  
Closed Loop ◽  
Machining Process ◽  
Machining Accuracy ◽  
Closed Loop Control ◽  
Machining Processes ◽  
Loop Control ◽  
Accuracy And Precision ◽  
Optimal Values ◽  
Work Done

In-process and on-machine measurements are used to evaluate a variety of machining factors and conditions as well as the work done on the machine tool. With the increasing complexity of machining processes and greater requirements for accuracy and precision, the demand for advanced methods for process optimization has also increased. To meet this demand, process quality management (QM) requires an expansion of manufacturing metrology to include comprehensive closed-loop control of the machining process. To eliminate the effects of disturbances on the machining process and adjust the control quantities to optimal values for robustness, in-process and on-machine measurements are very essential. In this paper, we review technical trends in in-process and on-machine measurements for process QM and conventional quality control (QC) of products. Spreading measurement targets and applications are comprehensively reviewed.

Research on Power Ultrasonic Vibration Honing of Sintered Nd-Fe-B

2012 ◽  
Vol 472-475 ◽  
pp. 962-967 ◽  
Author(s):  
Yun Peng Shao ◽  
Xi Jing Zhu ◽  
Ai Ling Wang ◽  
Zhen Liu
Keyword(s):  
Ultrasonic Vibration ◽  
Material Removal ◽  
Removal Rate ◽  
Processing Parameters ◽  
Machining Process ◽  
Processing Efficiency ◽  
Workpiece Surface ◽  
Optimal Processing ◽  
Orthogonal Experiments ◽  
Power Ultrasonic

The technology of power ultrasonic vibration honing was used for the brittle hard sintered Nd-Fe-B materials in this paper. The feasibility and correctness of machining process was analyzed through experiments. Compared normal process result with orthogonal experiments, it was better to use power ultrasonic vibration honing to obtain parts with less surface roughness and higher material removal rate, and also the optimal processing parameters can be conduct. Therefore, the power ultrasonic vibration honing can be used to improve workpiece surface quality, as well as processing efficiency, precision, which is an effective method for precise machining of sintered Nd-Fe-B materials.

scholarly journals Various developments in Abrasive Flow Machining Process: A Review

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Parvesh Ali ◽  
Ranganath M. S ◽  
R.S Walia ◽  
Q. Murtaza
Keyword(s):  
Surface Finish ◽  
Material Removal ◽  
Abrasive Particle ◽  
Machining Process ◽  
Complex Geometries ◽  
Major Objective ◽  
Workpiece Surface ◽  
Abrasive Particles ◽  
Abrasive Flow Machining ◽  
Recent Developments

Abrasive flow machining is a nonconventional process used for polishing of metallic components, internal inaccessible cavities or recesses using a semi liquid paste. It was developed to deburr, polish the surfaces having complex geometries and edges by flowing abrasive particles with a visco-elastic nonconductive media over them. Abrasive particle sharp cutting edges remove the material by abrasion mechanism from the workpiece surface. In the recent year, work has been carryout towards the development of abrasive flow machining for achieving the higher material removal and improved surface finish. This method has a unique property of simultaneous improvement in material removal and surface finish. In this paper authors discussed about various recent developments in abrasive flow machining with major objective of improving the productivity of the process.

The Impact of Visual Feedback Type on the Mastery of Visuo-Motor Transformations

2012 ◽  
Vol 220 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Sandra Sülzenbrück
Keyword(s):  
Empirical Research ◽  
Visual Feedback ◽  
Closed Loop ◽  
Motor Planning ◽  
Visual Input ◽  
Closed Loop Control ◽  
Loop Control ◽  
Feedback Type ◽  
Effective Use ◽  
The Impact

For the effective use of modern tools, the inherent visuo-motor transformation needs to be mastered. The successful adjustment to and learning of these transformations crucially depends on practice conditions, particularly on the type of visual feedback during practice. Here, a review about empirical research exploring the influence of continuous and terminal visual feedback during practice on the mastery of visuo-motor transformations is provided. Two studies investigating the impact of the type of visual feedback on either direction-dependent visuo-motor gains or the complex visuo-motor transformation of a virtual two-sided lever are presented in more detail. The findings of these studies indicate that the continuous availability of visual feedback supports performance when closed-loop control is possible, but impairs performance when visual input is no longer available. Different approaches to explain these performance differences due to the type of visual feedback during practice are considered. For example, these differences could reflect a process of re-optimization of motor planning in a novel environment or represent effects of the specificity of practice. Furthermore, differences in the allocation of attention during movements with terminal and continuous visual feedback could account for the observed differences.

118-LB: Glucose Variability throughout the Menstrual Cycle on Closed-Loop Control in Type 1 DM

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 118-LB
Author(s):  
CAROL J. LEVY ◽  
GRENYE OMALLEY ◽  
SUE A. BROWN ◽  
DAN RAGHINARU ◽  
YOGISH C. KUDVA ◽  
...  
Keyword(s):  
Menstrual Cycle ◽  
Closed Loop ◽  
Glucose Variability ◽  
Closed Loop Control ◽  
Loop Control ◽  
Type 1 Dm
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