Charakterisierung von Schleifschneckentopographien*/Characterization of Grinding Worm Topographies. Method for Determination of Characteristic Values for Continuous Generating Gear Grinding

2019 ◽  
Vol 109 (06) ◽  
pp. 479-482
Author(s):  
M. Ophey ◽  
P. Teixeira ◽  
C. Löpenhaus ◽  
T. Bergs
Keyword(s):  
Tool Wear ◽  
Machine Tool ◽  
Contact Conditions ◽  
Scientific Investigations ◽  
Gear Grinding ◽  
Characteristic Values ◽  
Chip Geometry

Aufgrund der erschwerten Zugänglichkeit der Schleifschneckenflanke und der veränderlichen Kontaktbedingungen beim kontinuierlichen Wälzschleifen wurden in bisherigen Arbeiten oftmals die Durchdringungsgrößen zwischen Werkzeug und Werkstück zur Beschreibung oder Modellierung des Prozesses herangezogen. Mit der am Werkzeugmaschinenlabor (WZL) entwickelten Methodik kann in Zukunft auch die Topographie der Schleifschnecke durch Kennwerte beschrieben und somit in Modellen, zum Beispiel zur Vorhersage der Kraft oder des Verschleißes, berücksichtigt werden.   Due to the difficult accessibility of the grinding worm flank and the variable contact conditions of continuous generating gear grinding, the undeformed chip geometry has often been used in scientific investigations to describe or model the process. With the new methodology developed at the Machine Tool Laboratory (WZL), the topography of the grinding worm can be described with characteristic values and thus can be taken into account in models, e.g. for prediction of force or tool wear.

Extended Calculation Model for Generating Gear Grinding Processes

2016 ◽  
Vol 1140 ◽  
pp. 141-148 ◽  
Author(s):  
Florian Hübner ◽  
Christoph Löpenhaus ◽  
Fritz Klocke ◽  
Christian Brecher
Keyword(s):  
Calculation Model ◽  
Grinding Process ◽  
Contact Conditions ◽  
Scientific Investigations ◽  
Cylindrical Gears ◽  
Gear Grinding ◽  
Continuous Generation ◽  
Characteristic Values ◽  
Gear Geometry ◽  
Hard Finishing

Generally, hard finishing is the final step in manufacturing cylindrical gears. The most established processes for hard finishing are continuous generation grinding and discontinuous profile grinding [1]. Despite the wide industrial application of the continuous generation grinding process, only few scientific investigations exist. One possible reason for this are the complex contact conditions between tool and gear flank. Modelling the complex contact conditions between grinding worm and gear to calculate cutting forces, characteristic values as well as micro- and macroscopic gear geometry are the topics of this paper. The approaches are introduced and results for validation are presented and discussed.

Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

2020 ◽  
Vol 11 (1) ◽  
pp. 93-99
Author(s):  
Abu Zakir Morshed ◽  
Sheikh Shakib ◽  
Tanzim Jahin
Keyword(s):  
Immersion Time ◽  
Chloride Content ◽  
Engineering Science ◽  
Coastal Regions ◽  
Faraday’S Law ◽  
Current Technique ◽  
Corrosion Cell ◽  
Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

The Determination of Sense via Deleuze and Blanchot: Paradoxes of the Habitual, the Immemorial, and the Eternal Return

2008 ◽  
Vol 2 (2) ◽  
pp. 155-177 ◽  
Author(s):  
Eugene Brently Young
Keyword(s):  
Eternal Return

Eternal return is the paradox that accounts for the interplay between difference and repetition, a dynamic at the heart of Deleuze's philosophy, and Blanchot's approach to this paradox, even and especially through what it elides, further illuminates it. Deleuze draws on Blanchot's characterisations of difference, forgetting, and the unlivable to depict the ‘sense’ produced via eternal return, which, for Blanchot, is where repetition implicates or ‘carries’ pure difference. However, for Deleuze, difference and the unlivable are also developed by the living repetition or ‘contraction’ of habit, which results in his distinctive characterization of ‘force’, ‘levity’, and sense in eternal return.

SEM/EDS Characterization of Uncommon Metal Whiskers and Determination of Underlying Growth Mechanisms

2018 ◽  
Author(s):  
D. Basak ◽  
L. H. Ponce
Keyword(s):  
Reliability Analysis ◽  
Case Studies ◽  
Whisker Growth ◽  
Innovation Systems ◽  
Growth Mechanisms ◽  
Crystal Oscillator ◽  
Analysis Laboratory ◽  
Investigative Techniques

Abstract Two case-studies on uncommon metals whiskers, performed at the Reliability Analysis Laboratory (RAL) of Northrop Grumman Innovation Systems, are presented. The components analyzed are an Oven Controlled Crystal Oscillator (OCXO) and an Electromechanical Relay. Investigative techniques were used to determine the chemical and physical makeup of the metal whiskers and develop an understanding of the underlying effects and mechanisms that caused the conditions conducive to whisker growth.

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