Analysis of Shrinkage Characteristics of Aluminium Silicon Alloy

2016 ◽  
Vol 16 (3) ◽  
pp. 163-171 ◽  
Author(s):  
Syed Ferhathullah Hussainy ◽  
Mohd. Viquar Mohiuddin ◽  
P. Laxminarayana ◽  
S. Sundarrajan ◽  
A. Krishnaiah
Keyword(s):  
Solidification Process ◽  
Literature Survey ◽  
Extensive Literature ◽  
Industrial Environment ◽  
Silicon Alloy ◽  
Casting Yield ◽  
Cavity Filling ◽  
Alloy Castings ◽  
Filling And Solidification ◽  
Critical Aspects

AbstractAnalysis of shrinkage characteristics of Aluminium-Silicon alloy was studied theoretically and experimentally. The Aluminium alloys considered in the study are A413 (LM6), A360 (LM9) and A380 (LM24). Extensive literature survey has suggested that cavity filling and solidification process are two most critical aspects to produce high quality casting components. A statistical model of parameters and response to understand the influence of parameters on shrinkage and casting yield studies has been presented. Experiments were conducted in foundry in industrial environment to produce commercially treated aluminium alloy castings in sand mould. Alloy was found to be most significant factor influencing shrinkage. The yield of casting was improved using insulating and exothermic sleeves. Solidification time of exothermic riser was 10 % more than insulated riser. Thus, in order to produce radiographic quality casting a theoretical and experimental method is presented so that number of trials in foundry is reduced which leads to increased reliability and productivity. Study also shows that by using sleeves considerable metal is saved, energy saving during melting, improved quality, reduced cost and increased capacity of plant can be achieved.

Simulation of Flow Field and Temperature Tield in the Process of Filling and Solidification for K424 Alloy Thin-Walled Casting

2011 ◽  
Vol 66-68 ◽  
pp. 1568-1573
Author(s):  
Xin Wang ◽  
Zhi Jun Zhang
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Solidification Process ◽  
Temperature Changes ◽  
Theoretical Support ◽  
Alloy Castings ◽  
Dimensional Simulation ◽  
Filling Simulation ◽  
Cast Analysis ◽  
Filling And Solidification

In order to improve the utilization of K424 alloy, Z-Cast analysis software is used to get three-dimensional flow field and temperature coupling simulation in the process of K424 alloy castings filling, by considering the effection of pouring temperature, casting speed, shell thermal conductivity and temperature on the morphology of filling.A three-dimensional simulation of temperature changes in solidification process of molten metal was performed based on the filling simulation. The simulation results on flow field and temperature field shows the order of filling and solidification in different parts of the casting ,and determines the position where cold shut and misrun appears, which provides theoretical support to the improvement of technology plan.

scholarly journals Development of Universal Mould Geometry for the Teeming of Cylindrical Iron-Base Alloy Ingots

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 471
Author(s):  
Josef Odehnal ◽  
Pavel Ludvík ◽  
Tomáš Studecký ◽  
Pavel Michálek
Keyword(s):  
Alloy Steel ◽  
Base Alloy ◽  
Cast Steel ◽  
Solidification Process ◽  
High Alloy ◽  
High Alloy Steel ◽  
Iron Base Alloy ◽  
Steel Grades ◽  
Borated Stainless Steel ◽  
Filling And Solidification

The presented work is aimed at developing a mould geometry suitable for casting both low- and high-alloy steel grades into 500 kg experimental ingots. The high Height-to-Diameter (H/D)-ratio mould currently used in COMTES FHT Inc. served as a reference and for finite element method simulations (FEM) of the filling and solidification process. The optimized mould geometry, balancing the porosity and segregations, was determined using MAGMA software. Four different steel grades were defined for the simulation. Case studies were carried out for 34CrNiMo6 (W.Nr. 1.6582), DHQ8, CB2 and borated stainless steel grades ranging from low-alloy steel to high-alloy steel. Extended user-defined criteria and verified boundary conditions were used to predict the formation of A-segregations in cast steel. Both primary (PDAS) and secondary (SDAS) arm spacings were modelled as well. The optimized mould shape and the casting assembly were designed based on the simulation results.

Numerical Simulation of Filling and Solidification in Sand Casting by Procast

2013 ◽  
Vol 791-793 ◽  
pp. 550-553 ◽  
Author(s):  
Dong Dong Han ◽  
Cheng Jun Wang ◽  
Juan Chang ◽  
Lei Chen ◽  
Huai Bei Xie
Keyword(s):  
Numerical Simulation ◽  
Heat Dissipation ◽  
Solidification Process ◽  
Simulation Software ◽  
Sand Casting ◽  
Production Costs ◽  
Raw Material ◽  
Casting Defects ◽  
Three Dimension ◽  
Filling And Solidification

At present, pulley produced in China has been able to meet the demand of domestic and international markets. But there are many problem of the pulley industry in our country, such as too many production enterprises and the low level of export products. And as components of drive system are light weight and raw material price of pulley casting are rising, manufacturing requirements of the pulley are also more and more high. Aiming at the casting defects of pulley that enterprise current product, pulley casting blank model of common material HT250 be made by three-dimension software, numerical simulation of filling and solidification process for pulley sand casting by the casting simulation software Procast, the size and location of the various casting defects were forecasted and analyzed, reflecting the pulley filling and solidification process of the actual situation, due to the thicker pulley rim and less heat dissipation, position of shrinkage is close to the middle of rim [, a method of eliminating defects is proposed to realize sequential solidification, and thus to minimize porosity shrinkage and improve casting performance and reduce casting time and reduce production costs.

To determine the critical factors for the adoption of cloud computing in the educational sector in developing countries – a fuzzy DEMATEL approach

Kybernetes ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Riddhi Rajendra Thavi ◽  
Vaibhav S. Narwane ◽  
Rujuta Hemal Jhaveri ◽  
Rakesh D. Raut
Keyword(s):  
Cloud Computing ◽  
Developing Countries ◽  
Influential Factors ◽  
Literature Survey ◽  
Extensive Literature ◽  
Critical Factors ◽  
Fuzzy Dematel ◽  
Learning Skills ◽  
Content Type ◽  
Practical Implications

PurposeThe paper focuses on reviewing and theorizing the factors that affect the adoption of cloud computing in the education sector narrowing the focus to developing countries such as India.Design/methodology/approachThrough an extensive literature survey, critical factors of cloud computing for education were identified. Further, the fuzzy DEMATEL approach was used to define their interrelationship and its cause and effect.FindingsA total of 17 factors were identified for the study based on the literature survey and experts' input. These factors were classified as causes and effects and ranked and interrelated. “Required Learning Skills and Attitude,” “Lack of Infrastructure,” “Learners' Ability” and “Increased Investment” are found to be the most influential factors.Practical implicationsThe resultant ranking factors can be used as a basis for managing the process of cloud adoption in several institutions. The study could guide academicians, policymakers and government authorities for the effective adoption of cloud computing in education.Originality/valueThe study investigates interdependency amongst the factors of cloud computing for education in context with developing economy. This is one of first study in higher education institutes of India.

scholarly journals Microwave diathermy

1981 ◽  
Vol 37 (1) ◽  
pp. 7-9 ◽  
Author(s):  
L. Hayward ◽  
A. Statham
Keyword(s):  
Human Subjects ◽  
Literature Survey ◽  
Paraffin Wax ◽  
Reference List ◽  
Extensive Literature ◽  
Full Reference ◽  
Microwave Diathermy

An extensive literature survey is summarised. Experimentation consisted of irradiation of paraffin wax and human subjects with microwave of frequency 2 450 MHz Results, conclusions and recommendations are briefly stated. A full reference list is given.

scholarly journals Green Banking in the Way of Sustainable Development: An Overview of Practice and Progress in Bangladesh

2020 ◽  
pp. 105-119 ◽  
Keyword(s):  
Sustainable Development ◽  
Secondary Data ◽  
Present Situation ◽  
Literature Survey ◽  
Global Perspective ◽  
Extensive Literature ◽  
Secondary Sources ◽  
Green Finance ◽  
Literature Reviews ◽  
The Way

The main objective of the study is to evaluate the practice and progress of the activities of green banking in the way of sustainable development of Bangladesh. Green banking is regarded as sustainable banking, which has a role to safeguard the planet from environmental degradation, with an aim of ensuring sustainable development. It comprises the choices that take sustainability into account. Sustainable development is an expansion that comes across the requirements of the present situation without overlooking the capacity of future situations to meet the necessities. Bangladesh is in need of proper adaptation and utilization of green banking for its sustainable development. The present study is conceptual and analytical in nature based on the secondary data with an extensive literature survey along with scanning the annual and quarterly reports of Bangladesh Bank on green banking during the 2011-2019 fiscal years. The secondary sources of data are internet and commercial banks websites, Bangladesh Bank (BB) websites and literature reviews, etc. The collected data are analyzed and interpreted in the light of the practice and progress of activities of green banking in Bangladesh from a global perspective. The study shows that banking in Bangladesh is in the diversification phase passing through the intensification and foundation phases. It is progressing steadily. They have a lot more scope to contribute to the diversification of green finance in the way of sustainable development of Bangladesh. Rigorous, effective, and coherent efforts from banks in this regard are the demands of the day.

Melt Mold Casting Process Optimization of Train Coupler Based on ProCAST

2018 ◽  
Vol 764 ◽  
pp. 312-322
Author(s):  
Cheng Jun Wang ◽  
Jin Yan Chen ◽  
Yu Zhe Shen
Keyword(s):  
Process Optimization ◽  
Simulation Analysis ◽  
Solidification Process ◽  
Casting Process ◽  
Process Measures ◽  
Technical Requirements ◽  
Shrinkage Defects ◽  
Mold Casting ◽  
Cae Simulation ◽  
Filling And Solidification

In order to solve production defects such as shrinkage and porosity inside a certain train coupler casting in Anhui Xinhong Machinery Co.,Ltd., the main reasons of defects are found through the process of CAE simulation analysis and physical X ray detection to determine the location and morphology of casting defects and to reflect the actual situation of coupler filling and solidification process. The main reasons are found as follows: uneven thickness of casting structure, insufficient original gating and feeding system and etc. Through the process optimization and apply multidimensional vibration, then test validation, the train coupler casting which meets the technical requirements has been successfully produced, ensuring the smooth mass production of the company. ProCAST numerical simulation results have confirmed the rationality of the proposed work in optimization process measures in reducing and eliminating the shrinkage defects.

Solidification and Microstructure Simulation of A356 Aluminum Alloy Casting

2021 ◽  
Vol 1033 ◽  
pp. 18-23
Author(s):  
Li Tong He ◽  
Yi Dan Zeng ◽  
Jin Zhang
Keyword(s):  
Aluminum Alloy ◽  
Solidification Process ◽  
Casting Process ◽  
Uniform Structure ◽  
A356 Aluminum Alloy ◽  
Aluminum Alloy Casting ◽  
Alloy Casting ◽  
Shrinkage Defects ◽  
A356 Aluminum ◽  
Filling And Solidification

To obtain an A356 aluminum alloy casting with a uniform structure and no internal shrinkage defects, ProCAST software is used to set different filling and solidification process parameters for an A356 aluminum alloy casting with large wall thickness differences, And multiple simulations are conducted to obtain optimized casting process; then, based on the process, the microstructure of the thickest and thinnest part of the casting are simulated. The size, morphology, and distribution of the simulated microstructure of the thinnest part and the thickest part of the casting are very similar. The simulated microstructure is similar to that of the actual casting. This shows that castings with uniform structure and no internal shrinkage defects can be obtained through the optimized casting process .

Maritime Archaeological Research in Sub-Saharan Africa

2021 ◽  
Author(s):  
Bruno E.J.S. Werz
Keyword(s):  
South Africa ◽  
Early Development ◽  
Maritime Archaeology ◽  
Development Stage ◽  
Literature Survey ◽  
Sub Saharan Africa ◽  
Extensive Literature ◽  
Archaeological Research ◽  
Academic Publications ◽  
Sub Saharan

Maritime archaeology in sub-Saharan Africa is still in its early development stage. An extensive literature survey indicated that relatively few projects of this nature have been undertaken in these parts. Even fewer warrant the adjective “scientific,” based on the dearth of peer-reviewed academic publications that have appeared to date. Based on the survey, it seems that most research is undertaken in South Africa, Kenya, and Namibia, and the emphasis therefore lies with these countries.

Ontology-Based Opinion Mining for Online Product Reviews

2019 ◽  
pp. 123-148 ◽  
Author(s):  
Farheen Siddiqui ◽  
Parul Agarwal
Keyword(s):  
Information Extraction ◽  
Opinion Mining ◽  
Domain Ontology ◽  
Literature Survey ◽  
Extensive Literature ◽  
Product Reviews ◽  
Product Domain ◽  
User Centric ◽  
Selection Of

In this chapter, the authors work at the feature level opinion mining and make a user-centric selection of each feature. Then they preprocess the data using techniques like sentence splitting, stemming, and many more. Ontology plays an important role in annotating documents with metadata, improving the performance of information extraction and reasoning, and making data interoperable between different applications. In order to build ontology in the method, the authors use (product) domain ontology, ConceptNet, and word net databases. They discuss the current approaches being used for the same by an extensive literature survey. In addition, an approach used for ontology-based mining is proposed and exploited using a product as a case study. This is supported by implementation. The chapter concludes with results and discussion.

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