scholarly journals APPLICATION OF SIMILARITY METHOD AND DIMENSIONAL ANALYSIS IN DETERMINING THE PERFORMANCE PARAMETERS OF AGITATOR PADDLES FOR CALTEX AQUATEX 3180 CUTTING OIL

2020 ◽  
Vol 6 (1) ◽  
pp. 47-54
Author(s):  
Do Thi Tam ◽  
Tran The Long ◽  
Nguyen Hoang Quan
Keyword(s):  
Dimensional Analysis ◽  
General Purpose ◽  
Cutting Fluid ◽  
Machining Processes ◽  
Input Parameters ◽  
Experimental Process ◽  
Actual Operation ◽  
Machining Operations ◽  
Similarity Method

Aquatex 3180 is the general purpose soluble oil, formulated for use in a wide variety of machining operations. In fact, the natural diffusion in the liquid is very slow, especially the mixing ratio, and the homogeneity of the solution is difficult to achieve according to the manufacturer's recommendation. Hence, the agitator is required to improve the uniformity of the solution in that the obtained cutting fluid can be effectively used in machining processes to fulfill the role of cooling and lubricating. In this work, the application of the similarity method and dimensional analysis for studying agitator model for mixing Aquatex 3180 cutting oil to build the set of input parameters in the experimental process. The results reveal that the input parameters in the study of the agitator model using 9 similarity criterions πi (i = 1 ... 9) instead of 12 independent parameters. In addition, the standard π2 can characterize the displacement properties of the fluid flow considering the influence of gravity. It means that the number of experiments reduce but still ensure that many experimental input parameters are still guaranteed, therefore ensuring proper description of the actual operation of the machine.

A Review on the Performance of Tribological Properties of Cutting Fluids

2015 ◽  
Vol 812 ◽  
pp. 102-106
Author(s):  
S. Ganesh ◽  
Jamaludeen Umar Mohamed ◽  
C. Rajaganapathy ◽  
V. Saravanakumar
Keyword(s):  
Titanium Alloys ◽  
Metal Removal ◽  
Mineral Oil ◽  
Industrial Sector ◽  
Cutting Fluid ◽  
Cutting Fluids ◽  
Mechanical Field ◽  
Major Application ◽  
Machining Operations

Tribology deals with friction, wear and lubricants. It plays an important role in mechanical field. It finds its major application in industrial and automotive sector, in which this thesis considered the tribology in metal removal industrial sector. In that application, the role of cutting fluid in lathe machining operations have been chosen. One of the most important challenging cases is to minimize the friction in machining of titanium alloys. While machining, the heat should be minimized as low as possible. This thesis deals with the study of cutting fluids in machining of titanium alloys. The problem occurs while using mineral oil as a cutting fluid in machining that it is non-biodegradable in nature and affects the environment while disposing it. This thesis aims to identify the alternate cutting fluids instead of mineral oil, which is to be effective cooling and non-toxic to environment. For that, Machining condition should be controllable by using some grammar rule without affecting the Productivity.

GEOPHYSICS OF ENTANGLED STATES OF THE COVID-19 PANDEMIC AND QUANTUM TELEPORTATION OF SARS COV-2 IN THE PLANET'S BIOGEOSPHERE

2020 ◽  
Author(s):  
Vladimir Gavrilov ◽  
Tatyana Antipova ◽  
Yan Vlasov ◽  
Sergey Ardatov ◽  
Anastasia Ardatova
Keyword(s):  
Entangled States ◽  
Classical Communication ◽  
Special Services ◽  
External Relations ◽  
Useful Signal ◽  
Experimental Process ◽  
The Russian Federation ◽  
Academy Of Sciences ◽  
Principle Of Complementarity

In their previous works , leading their history since 1988, the authors of this article have repeatedly conceptually shown and experimentally verified the results of research on the teleportation of information between macro objects. Early author's works were performed during the existence of the Russian Federation – as a country called the Union of Soviet Socialist Republics (USSR). Some of which were marked "Top Secret" - links further down the text. Since they were performed under the supervision of the relevant special services and further "Department of external relations of the Russian Academy of Sciences". The authors used numerous examples to demonstrate the possibility of teleportation of information in macro-systems, including ecosystem, biogeocenotic levels, and then tissue and organism levels. Successful experimental verifications occurred only in cases when all the principles and rules laid down in the theory of quantum information, applied to biological objects, were correctly combined. Namely, the preparation of cascades of entangled States was performed both on the mental and somatic levels. In full accordance with the principle of complementarity and taking into account the fact that the observer and the observed are actively connected by the sum of similarities. In addition, the role of the classical communication channel in this process was performed by carrier electromagnetic fields modulated by a useful signal. This signal represented a cast of the simulated experimental process. An example of a real COVID-19 pandemic is the verification of author's works in nature on a biogeocenotic scale. And certainly with anthropogenic – so to speak-participation.

Studying The Effect of a New Mixed Cutting Fluid on Surface Roughness

2020 ◽  
Vol 38 (11A) ◽  
pp. 1593-1601
Author(s):  
Mohammed H. Shaker ◽  
Salah K. Jawad ◽  
Maan A. Tawfiq
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Cutting Parameters ◽  
Machining Process ◽  
Cutting Fluid ◽  
Depth Of Cut ◽  
Cutting Fluids ◽  
Machining Processes ◽  
Dry Cutting ◽  
Cutting Speeds

This research studied the influence of cutting fluids and cutting parameters on the surface roughness for stainless steel worked by turning machine in dry and wet cutting cases. The work was done with different cutting speeds, and feed rates with a fixed depth of cutting. During the machining process, heat was generated and effects of higher surface roughness of work material. In this study, the effects of some cutting fluids, and dry cutting on surface roughness have been examined in turning of AISI316 stainless steel material. Sodium Lauryl Ether Sulfate (SLES) instead of other soluble oils has been used and compared to dry machining processes. Experiments have been performed at four cutting speeds (60, 95, 155, 240) m/min, feed rates (0.065, 0.08, 0.096, 0.114) mm/rev. and constant depth of cut (0.5) mm. The amount of decrease in Ra after the used suggested mixture arrived at (0.21µm), while Ra exceeded (1µm) in case of soluble oils This means the suggested mixture gave the best results of lubricating properties than other cases.

An overview on role of unconventional machining processes on different materials

2021 ◽  
Author(s):  
Pradeep Jayappa ◽  
Santhosh Srinivasan ◽  
K. Vetrivel Murugan ◽  
C. Thangavel ◽  
M. Bala Theja ◽  
...  
Keyword(s):  
Machining Processes ◽  
Unconventional Machining

A Comparative Study of Tribological Behavior of Steel Sliding Against WC Under Mineral and Biodegradable Oil Lubrication

2012 ◽  
Author(s):  
Anup Darshan ◽  
UmaMaheshwera Reddy Paturi ◽  
Narala Suresh Kumar Reddy ◽  
Srinivasa Prakash Regalla
Keyword(s):  
Tribological Properties ◽  
Positive Impact ◽  
Research Work ◽  
Mineral Oil ◽  
Optical Microscope ◽  
Machining Processes ◽  
Alternative Source ◽  
Pin On Disc ◽  
Steel Disc ◽  
Machining Operations

Now a days for machining operations apart from good tribological properties, the lubricant is also expected to be non-hazardous and non-polluting. When considering the ecological and environmental aspects in machining processes, the use of biodegradable oil can be an alternative source of lubricant due to its positive impact to employee health and environmental pollution. In this regard, our research work uses vegetable based cutting fluids developed from canola and sunflower oil, in an attempt to provide an eco-friendly environment. Experiments are carried out on a pin-on-disc tribometer with tungsten carbide (WC) pin against AISI 4340 steel disc for different sliding times under different environments, thus simulating the machining environment. The tribological properties, wear and friction of vegetable based oils were comparatively investigated with a commercially available mineral oil. Wear tracks and roughness profiles of test specimens were compared by using optical microscope and profilometer respectively. Results indicated that vegetable based canola oil demonstrated excellent tribological properties compared to that of commercial mineral oil.

scholarly journals Securitization of (bad) loans to Italian SMES: The role of the public guarantee

2021 ◽  
Vol 16 (4) ◽  
pp. 193-208
Author(s):  
Lucilla Bittucci ◽  
Stefano Marzioni ◽  
Pina Murè ◽  
Marco Spallone
Keyword(s):  
Financial Stability ◽  
Positive Impact ◽  
Central Banks ◽  
General Purpose ◽  
Recent Past ◽  
Balance Sheets ◽  
Access To Credit ◽  
The Public ◽  
Main Factors

This study investigates the main factors driving the evolution of the securitization of loans to Italian small and medium-sized enterprises (SMEs). The value of securitization increased in last two years, even though it has not been used as collateral for central banks. The disposal of non-performing loans (NPLs) may have been rather triggered by increasing attention of the international institutions to such an issue, within the general purpose of financial stability. The purpose of this paper is to interpret such a phenomenon focusing on Italian banks and restricting the analysis to the case of securitizations backed with loans to small and medium-sized enterprises (SMEs). The interesting result that emerges, supported by econometrically tested empirical evidence, is that given the orientation of international financial institutions, such as the ECB and the EBA, and reacting to incentives coming from the fiscal policy authorities for the public guarantee of loans, banks have been using securitization to reduce the burden on their bad balance sheets due to (NPLs). It was found that the public guarantee had a positive impact on SME securitization, whereas securitization in other sectors has not been affected significantly. Such evidence suggests that, in the absence of a public guarantee, the financial stability target would have been at risk, and the effectiveness of collateral-based policies in the recent past must be improved to enhance access to credit for SMEs.

scholarly journals A Reliable Turning Process by the Early Use of a Deep Simulation Model at Several Manufacturing Stages

2017 ◽  
Author(s):  
Gorka Urbikain ◽  
Luis Norberto López De Lacalle ◽  
Mikel Arsuaga ◽  
Alvaro Alvarez ◽  
Miguel A. Alonso
Keyword(s):  
Machine Tools ◽  
Manufacturing Companies ◽  
Machining Processes ◽  
Knowledge Based ◽  
Direct Benefits ◽  
Definition Of ◽  
The Right ◽  
Machining Operations ◽  
Physical Laws ◽  
Manufacturing Problems

The future of machine tools will be dominated by highly flexible and interconnected systems, in order to achieve the required productivity, accuracy and reliability. Nowadays, distortion and vibration problems are easily solved in labs for the most common machining operations by using models based on equations describing the physical laws of the machining processes; however additional efforts are needed to overcome the gap between scientific research and the real manufacturing problems. In fact, there is an increasing interest in developing simulation packages based on “deep-knowledge and models” that aid machine designers, production engineers or machinists to get the best of the machine-tools. This article proposes a methodology to reduce problems in machining by means of a simulation utility, which uses the main variables of the system&process as input data, and generates results that help in the proper decision-making and machining planification. Direct benefits can be found in a) the fixture/clamping optimal design, b) the machine tool configuration, c) the definition of chatter-free optimum cutting conditions and d) the right programming of cutting toolpaths at the Computer Aided Manufacturing (CAM) stage. The information and knowledge-based approach showed successful results in several local manufacturing companies and are explained in the paper.

scholarly journals STEP-NC-Compliant Implementation to Support Mixed-Control Technologies Applied to Stone-Processing Machines Based on Industrial Automation Standards

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 327
Author(s):  
Julio Garrido ◽  
Diego Silva ◽  
Juan Sáez
Keyword(s):  
General Purpose ◽  
Numerical Control ◽  
Extended Model ◽  
Machining Processes ◽  
Product Model ◽  
Process Step ◽  
Mixed Control ◽  
Circular Saw ◽  
Stone Cutting ◽  
Control Technologies

STEP-NC (Standard for the Exchange of Product Model Data–Numerical Control) for metal milling and turning is not implemented by industrial computer numerical controllers. Solutions reported are prototypes based on post-processing in G-code. Moreover, minority machining processes, such as stone cutting, have not yet been contemplated in the STEP-NC standard. This article takes that sector as a use case. An extended STEP-NC model for circular saw stone-cutting operations is proposed, and a prototype automation implementation is developed to work with this extended model. This article shows how modern technological resources for coordinated axes control provided by many industrial controllers for the automation of general-purpose machines can speed up the processes of implementing STEP-NC numerical controllers. This article proposes a mixed and flexible approach for STEP-NC-based machine automation, where different strategies can coexist when it comes to executing STEP-NC machining files, so controllers do not need to implement the standard in an exhaustive way for all the possible features, but only at selected ones when convenient. This is demonstrated in a prototype implementation which is able to process STEP-NC product files with mixed-feature types: standard milling and non-standard sawblade features for stone processing.

scholarly journals THE LUCK IN “TALENT VERSUS LUCK” MODELING

2020 ◽  
Vol 23 (03) ◽  
pp. 2050007
Author(s):  
SEAN ELVIDGE
Keyword(s):  
Mean Value ◽  
Maximum Amount ◽  
Random Numbers ◽  
Individual Parameter ◽  
Input Parameters ◽  
The Mean ◽  
Model Variability ◽  
The Impact ◽  
The Relationship

This paper further investigates the Talent versus Luck (TvL) model described by [Pluchino et al. Talent versus luck: The role of randomness in success and failure, Adv. Complex Syst. 21 (2018) 1850014] which models the relationship between ‘talent’ and ‘luck’ on the impact of an individuals career. It is shown that the model is very sensitive to both random sampling and the choice of value for the input parameters. Running the model repeatedly with the same set of input parameters gives a range of output values of over 50% of the mean value. The sensitivity of the inputs of the model is analyzed using a variance-based approach based upon generating Sobol sequences of quasi-random numbers. When using the model to look at the talent associated with an individual who has the maximum capital over a model run it has been shown that the choice for the standard deviation of the talent distribution contributes to 67% of the model variability. When investigating the maximum amount of capital returned by the model the probability of a lucky event at any given epoch has the largest impact on the model, almost three times more than any other individual parameter. Consequently, during the analysis of the model results one must keep in mind the impact that only small changes in the input parameters can have on the model output.

scholarly journals The role of the leader in the institutional communication process in TRNC primary schools

2020 ◽  
Vol 13 (32) ◽  
pp. 1-15
Author(s):  
Mert Baştaş ◽  
Hüseyin Aktunç
Keyword(s):  
Primary School ◽  
Communication Skills ◽  
Primary Schools ◽  
General Purpose ◽  
Communication Process ◽  
School Teachers ◽  
Primary School Teachers ◽  
Leading Role ◽  
Institutional Communication

The general purpose of this research is the examination of the role of the leader in the institutional communication process in TRNC primary schools. While conducting the research, principals and deputy principals, who are administrators in primary schools, were accepted as leaders in schools. At this point, it has been tried to determine how teachers perceive corporate communication in TRNC primary schools and whether their administrators show a leading role in terms of communication skills. Among the most important results of the research; Primary school teachers with a bachelor's degree had a more positive attitude towards the communication skills of their administrators than primary school teachers with a master's degree. Most of the teachers (69.4%) participating in our study stated that the most important feature that a leader should have is "effective communication skills".

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