Investigations on the Impact of Additively Manufactured Coolant Channels and Outlet Nozzles on Free Jet and Jet Forces in High-Pressure Cutting Fluid Supply

2021 ◽  
Author(s):  
Tobias Kelliger ◽  
Hui Liu ◽  
Daniel Schraknepper ◽  
Thomas Bergs
Keyword(s):  
High Pressure ◽  
Cutting Fluid ◽  
Free Jet ◽  
Fluid Supply ◽  
The Impact

scholarly journals Energy Efficient Cutting Fluid Supply: The Impact of Nozzle Design

Procedia CIRP ◽  
2017 ◽  
Vol 61 ◽  
pp. 564-569 ◽  
Author(s):  
Nadine Madanchi ◽  
Marius Winter ◽  
Sebastian Thiede ◽  
Christoph Herrmann
Keyword(s):  
Energy Efficient ◽  
Cutting Fluid ◽  
Nozzle Design ◽  
Fluid Supply ◽  
The Impact

scholarly journals Economic and ecological evaluation of high-pressure cutting fluid supply in milling of Ti-6Al-4V

Procedia CIRP ◽  
2021 ◽  
Vol 101 ◽  
pp. 362-365
Author(s):  
T. Lakner ◽  
A. Splettstoesser ◽  
D. Schraknepper ◽  
T. Bergs
Keyword(s):  
High Pressure ◽  
Cutting Fluid ◽  
Ecological Evaluation ◽  
Fluid Supply

Study on the Impact of the Cutting Process of Wire Saw on SiC Wafers

2011 ◽  
Vol 120 ◽  
pp. 593-597 ◽  
Author(s):  
Xiao Ye Wang ◽  
Yan Li ◽  
Shu Juan Li
Keyword(s):  
Rate Increase ◽  
Cutting Fluid ◽  
Thickness Variation ◽  
Speed Increase ◽  
Wire Saw ◽  
Fluid Supply ◽  
Diamond Wire Saw ◽  
Cutting Rate ◽  
Total Thickness Variation ◽  
The Impact

Based on reciprocating electroplated diamond wire saw cutting SiC wafers experiments, the influences law of wire saw diameter, wire saw quality, wire saw speed, wire saw wear and cutting fluid on cutting rate and wafers surface quality was studied. The results indicate that cutting rate increase with wire saw diameter and wire saw speed increase, and decreases with wire saw wear; wafers surface roughness increase with wire saw diameter increase and wire saw wear and a slightly lower with wire saw speed increase; TTV (total thickness variation) is risen slightly with wire saw diameter increase; wire saw wear and insufficient cutting fluid supply are the main factors to cause cutting time increase and wafers quality decline. And the experimental results were analyzed.

Development of a virtual sensor for the comparison of heat partitions in milling under cryogenic cooling lubrication and high-pressure cutting fluid supply

2021 ◽  
Vol 35 ◽  
pp. 118-131
Author(s):  
Thorsten Augspurger ◽  
Matthias Koch ◽  
Thomas Lakner ◽  
Andrea De Bartolomeis ◽  
Alborz Shokrani ◽  
...  
Keyword(s):  
High Pressure ◽  
Cryogenic Cooling ◽  
Cutting Fluid ◽  
Virtual Sensor ◽  
Fluid Supply

scholarly journals PULSATING HIGH-PRESSURE CUTTING FLUID SUPPLY FOR CHIP CONTROL IN FINISH TURNING OF INCONEL 718

2019 ◽  
Vol 2019 (04) ◽  
pp. 3200-3205 ◽  
Author(s):  
T. Bergs ◽  
A. Splettstosser ◽  
D. Schraknepper
Keyword(s):  
High Pressure ◽  
Inconel 718 ◽  
Cutting Fluid ◽  
Finish Turning ◽  
Fluid Supply

scholarly journals Influence of the frequency of pulsating high-pressure cutting fluid jets on the resulting chip length and surface finish

2021 ◽  
Author(s):  
Antonia Splettstoesser ◽  
Daniel Schraknepper ◽  
Thomas Bergs
Keyword(s):  
High Pressure ◽  
Cutting Speed ◽  
Surface Damage ◽  
Low Pressure ◽  
Cutting Fluid ◽  
Depth Of Cut ◽  
Time Intervals ◽  
Pressure Stage ◽  
Chip Breaking ◽  
Fluid Supply

AbstractHigh-pressure cutting fluid supply is a proven technology for chip breaking when turning difficult-to-cut materials, such as Inconel 718. However, the technology is usually not suitable for the finish turning of safety-critical parts in aero engines. The acting force of the cutting fluid jet on the back of the chip causes chip breaking. The broken chips are then accelerated by the cutting fluid jet towards the workpiece surfaces where they cause damage on impact. One approach to minimize surface damage is a specific increase in the chip length. The center of gravity of the chips with an adjusted length is shifted out of the focus where the cutting fluid jet hits the chips. Hence, the already finished surface is subjected to fewer impacts of the chips. In this study, the adjustment of the chip length by pulsating high-pressure cutting fluid supply to prevent surface damage was investigated. A valve unit was used to generate two alternating cutting fluid supply pressure levels in certain time intervals. During the low-pressure stage, the force of the cutting fluid jet does not lead to chip breakage and the chip length increases until the valves switch and the high-pressure stage is released. The focus of this work was the analysis of the relationship between the duration of the low-pressure and high-pressure time intervals and the chip length. Additionally, the influence of the depth of cut, the feed, and the cutting speed on the chip length during pulsating high-pressure cutting fluid supply was investigated. Finally, a case study was carried out to evaluate the effectiveness of the pulsating high-pressure cutting fluid supply technology. Therefore, the shoulder surface of a demonstrator part was finished by face turning. Following, the cylindrical surface was finished with a continuous and pulsating high-pressure cutting fluid supply with varied supply parameters. Microscopic analyses of the surface prove that the pulsating high-pressure cutting fluid supply prevents the surface from being damaged by the impacts of chips.

Multiple orifices in customized microsystem high-pressure emulsification: The impact of design and counter pressure on homogenization efficiency

2014 ◽  
Vol 248 ◽  
pp. 107-121 ◽  
Author(s):  
Jan Henrik Finke ◽  
Svea Niemann ◽  
Claudia Richter ◽  
Thomas Gothsch ◽  
Arno Kwade ◽  
...  
Keyword(s):  
High Pressure ◽  
Counter Pressure ◽  
The Impact

scholarly journals Single Crystal Growth and Physical Properties of Pyroxene CoGeO3

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 378
Author(s):  
Li Zhao ◽  
Zhiwei Hu ◽  
Hanjie Guo ◽  
Christoph Geibel ◽  
Hong-Ji Lin ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Growth ◽  
Physical Properties ◽  
Single Crystal ◽  
Single Crystals ◽  
Magnetic Moments ◽  
Single Crystal Growth ◽  
The Impact

We report on the synthesis and physical properties of cm-sized CoGeO3 single crystals grown in a high pressure mirror furnace at pressures of 80 bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with TN∼33.5 K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions, which reveals the presence of sizable orbital moments in CoGeO3.

scholarly journals Robust and accurate prediction of thermal error of machining centers under operations with cutting fluid supply

CIRP Annals ◽  
2021 ◽  
Author(s):  
Toru Kizaki ◽  
Shinji Tsujimura ◽  
Yuya Marukawa ◽  
Shigeo Morimoto ◽  
Hisashi Kobayashi
Keyword(s):  
Thermal Error ◽  
Accurate Prediction ◽  
Cutting Fluid ◽  
Fluid Supply

Missed Shots at the Free-Throw Line

2015 ◽  
Vol 18 (6) ◽  
pp. 539-559 ◽  
Author(s):  
Mattie Toma
Keyword(s):  
High Pressure ◽  
National Collegiate Athletic Association ◽  
Statistical Significance ◽  
National Basketball Association ◽  
Choking Under Pressure ◽  
Professional Basketball ◽  
Free Throw ◽  
Percentage Points ◽  
Male College ◽  
The Impact

Choking under pressure represents a phenomenon in which individuals faced with a high-pressure situation do not perform as well as would be expected were they performing under normal conditions. In this article, I identify determinants that predict a basketball player’s susceptibility to choking under pressure. Identification of these determinants adds to our understanding of players’ psychology at pivotal points in the game. My analysis draws on play-by-play data from ESPN.com that feature over 2 million free-throw attempts in women’s and men’s college and professional basketball games from the 2002-2013 seasons. Using regression analysis, I explore the impact of both gender and level of professionalism on performance in high-pressure situations. I find that in the final 30 seconds of a tight game, Women’s National Basketball Association and National Basketball Association players are 5.81 and 3.11 percentage points, respectively, less likely to make a free throw, while female and male college players are 2.25 and 2.09 percentage points, respectively, less likely to make a free throw, though statistical significance cannot be established among National Collegiate Athletic Association women. The discrepancy in choking between college and professional players is pronounced when comparing male college players who do and do not make it to the professional level; the free-throw performance of those destined to go pro falls 6 percentage points more in high-pressure situations. Finally, I find that women and men do not differ significantly in their propensity to choke.

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