scholarly journals Identification of effective engineering methods for controlling handheld workpiece vibration in grinding processes

2020 ◽  
Vol 77 ◽  
pp. 102946
Author(s):  
Ren G. Dong ◽  
Daniel E. Welcome ◽  
Xueyan S. Xu ◽  
Thomas W. McDowell
Keyword(s):  
Grinding Processes ◽  
Workpiece Vibration

A review of the application of acoustic emission techniques for monitoring forming and grinding processes

2005 ◽  
Vol 159 (1) ◽  
pp. 48-61 ◽  
Author(s):  
T. Jayakumar ◽  
C.K. Mukhopadhyay ◽  
S. Venugopal ◽  
S.L. Mannan ◽  
Baldev Raj
Keyword(s):  
Acoustic Emission ◽  
Grinding Processes

scholarly journals A case study on the observability of cutting fluid flow and the associated contact mechanics in scaled rough surfaces

2021 ◽  
Vol 3 (5) ◽  
Author(s):  
Michael Müller ◽  
Lukas Stahl ◽  
Robar Arafat ◽  
Nadine Madanchi ◽  
Christoph Herrmann
Keyword(s):  
Fluid Flow ◽  
Contact Mechanics ◽  
Early Stage ◽  
Cutting Fluid ◽  
Cutting Fluids ◽  
Friction Behavior ◽  
Two Fluids ◽  
Grinding Processes ◽  
Different Characteristics ◽  
Tool Cutting

AbstractIn grinding processes, heat is generated by the contact of the grains with the workpiece. In order to reduce damages on the workpiece and the grinding tool, cutting fluids are necessary for most grinding processes. They have the tasks of cooling and lubricating the contact zone and to remove the chips from the contact area. Different types of cutting fluids perform differently regarding these tasks, which can be investigated on a laboratory scale. However, the results of those experiments are limited to certain workpieces and processes and information about the contact mechanics are not available. The experimental investigation of contact mechanics under cutting fluid influence is hardly possible. For this reason, this paper uses a measurement strategy that uses scaled topographies and has already been successfully applied to contact mechanics problems. With such a setup, it is intended that at an early stage in the development of cutting fluids, their characteristics in terms of contact mechanics can be determined very efficiently. To demonstrate this approach, two different cutting fluids were tested with the help of the associated test rig—a water miscible emulsion and a non-water miscible grinding oil. The two fluids showed fundamentally different characteristics regarding their hydrodynamic load bearing effect, their influence on the friction behavior of the contact and their fluid flow in the gap. The properties analyzed here correspond to the practical application of cutting fluids. The results underline the potential of the presented setup for an integration into the development process of cutting fluids.

Kantenpräparation durch Formschleifprozesse*/Cutting edge preparation by form grinding

2017 ◽  
Vol 107 (06) ◽  
pp. 453-460
Author(s):  
E. Prof. Uhlmann ◽  
J. Bruckhoff
Keyword(s):  
Tool Life ◽  
Cutting Tools ◽  
Cutting Edge ◽  
Grinding Processes ◽  
Form Grinding ◽  
Cutting Edge Preparation ◽  
Edge Preparation

Angesichts steigender Anforderungen an Zerspanwerkzeuge nimmt die Schneidkantenpräparation einen immer größer werdenden Stellenwert ein, da sich so die Standzeit von Zerspanwerkzeugen erhöhen lässt. Die bisher eingesetzten Präparationsverfahren eignen sich meist nur für einfache Verrundungen an der Schneidkante. In umfangreichen Untersuchungen wurde die Eignung von Formschleifprozessen zur Herstellung definierter Schneidkantenmikrogeometrien anhand von Arbeitsergebnissen analysiert.   Due to increasing demands on cutting tools cutting edge preparation has a high priority because it influences the tool life. Current cutting edge preparation processes can only generate simple roundings on the cutting edge. By extensive investigations the suitability of form grinding processes for the production of defined microgeometries on the cutting edge was analysed.

Prozessüberwachung beim ultraschallunterstützten Schleifen*/Influence of the tool-workpiece contact on the ultrasonic amplitudes in the grinding process

2018 ◽  
Vol 108 (07-08) ◽  
pp. 513-518
Author(s):  
J. Bruckhoff ◽  
E. Uhlmann
Keyword(s):  
High Hardness ◽  
Grinding Process ◽  
Process Measurement ◽  
Hard Materials ◽  
Grinding Processes ◽  
Technical Ceramics

Hinsichtlich Zähigkeit verbesserte technische Keramiken führen in Kombination mit der materialspezifischen hohen Härte dieser sprödharten Werkstoffe zu Herausforderungen bei der Bearbeitung. Das präzise sowie wirtschaftliche Bearbeiten geschieht daher vorwiegend mit Schleifverfahren. Die Ultraschallunterstützung kann die Produktivität von Schleifprozessen erhöhen. In-Prozess-Messungen der Ultraschallamplitude sollen Aufschluss über die Wechselwirkungen von Werkstück und Werkzeug geben.   Due to improved toughness and material-specific high hardness of technical ceramics, the machining of these brittle-hard materials is challenging. Therefore, precise and economical processing is mainly done by grinding. Ultrasonic support can increase the productivity of grinding processes. In-process measurement of ultrasonic amplitudes provides information about the interaction between the workpiece and the tool.

scholarly journals A unique CEL numerical method on material flow in a molten pool of workpiece vibration assisted welding

2020 ◽  
Vol 38 (2) ◽  
pp. 54s-58s
Author(s):  
Habib Hamed Zargari ◽  
Kazuhiro Ito ◽  
Yoshiki Mikami ◽  
Abhay Sharma
Keyword(s):  
Numerical Method ◽  
Material Flow ◽  
Molten Pool ◽  
Workpiece Vibration

scholarly journals Study on Generating Machining Performance of Two-Dimensional Ultrasonic Vibration-Composited Electrolysis/Electro-Discharge Technology for MMCs

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 617
Author(s):  
Jing Li ◽  
Wanwan Chen ◽  
Yongwei Zhu
Keyword(s):  
Ultrasonic Vibration ◽  
Orthogonal Experiment ◽  
Spindle Speed ◽  
Machining Efficiency ◽  
Matrix Composites ◽  
Two Dimensional ◽  
Machining Performance ◽  
Factors Affecting ◽  
Electro Discharge Machining ◽  
Workpiece Vibration

Ultrasonic vibration-composited electrolysis/electro-discharge machining technology (UE/DM) is effective for machining particulate-reinforced metal matrix composites (MMCs). However, the vibration of the tool or workpiece suitable for holes limits the application of UE/DM. To improve the generating machining efficiency and quality of flat and curved surfaces, in this study, we implemented two-dimensional ultrasonic vibration into UE/DM and constructed a novel method named two-dimensional ultrasonic vibration-composited electrolysis/electro-discharge machining (2UE/DM). The influence of vibration on the performance of 2UE/DM compared to other process technologies was studied, and an orthogonal experiment was designed to optimize the parameters. The results indicated that the materiel remove rate (MRR) mainly increased via voltage and tool vibration. The change current was responsible for the MRR in the process. Spindle speed and workpiece vibration were not dominant factors affecting the MRR; the spindle speed and tool and workpiece vibration, which reduced the height difference between a ridge and crater caused by abrasive grinding, were responsible for surface roughness (Ra) and form precision (δ). Additionally, the optimized parameters of 1000 rpm, 3 V, and 5 um were conducted on MMCs of 40 SiCp/Al and achieved the maximum MRR and minimum Ra and δ of 0.76 mm3/min, 3.35 um, and 5.84%, respectively. This study’s findings provide valuable process parameters for improving machining efficiency and quality for MMCs of 2UE/DM.

The Effects of Vibration and Pulsation on Metal Removal by a Plasma Torch

1973 ◽  
Vol 95 (2) ◽  
pp. 240-245 ◽  
Author(s):  
G. T. Dyos ◽  
J. Lawton
Keyword(s):  
Molten Metal ◽  
Gas Flow ◽  
Metal Removal ◽  
Capillary Waves ◽  
Plasma Jets ◽  
Removal Rates ◽  
Workpiece Vibration ◽  
Arc Current ◽  
Set Up ◽  
Gas Pulsations

An experimental study has been carried out on the effects of workpiece vibration and gas pulsations on metal removal rates using plasma jets. In the case of workpiece vibration, increases in removal rates of up to 30 percent were found, which can be accounted for in terms of capillary waves set up in the melt. The influence of pulsation of gas flow velocity and arc current at modulation levels of 10 percent was found to be negligible. A theoretical model has been developed which explains the results in terms of the development of resonance capillary waves in the molten metal and predicts the average depth of the layer of molten metal.

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