scholarly journals Critical review on different burnishing processes of Ti-6Al-4V Alloy

2020 ◽  
pp. 266-273
Author(s):  
Madhukar Samatham ◽  
Ashok Kumar U ◽  
Laxminarayana Pappula
Keyword(s):  
Surface Finish ◽  
Power Loss ◽  
Creep Property ◽  
Aerospace Engineering ◽  
Low Density ◽  
Nuclear Engineering ◽  
Cryogenic Burnishing ◽  
Lathe Machine ◽  
Titanium Material ◽  
Good Biocompatibility

Titanium and its alloys are the most commonly and most widely used due to its significant properties like good biocompatibility , good tensile strength , low density , and good creep property up to 300 degrees centigrade .It is used in the major engineering fields like civil engineering , nuclear engineering , aerospace engineering etc. Surface finish of the titanium material plays a prominent role in influencing its functional characteristics like wear resistance, fatigue strength, corrosion resistance and power loss due to friction. In normal machining methods like turning, milling or even classical grinding can’t meet the desired surface finish. To overcome this one of the method employed is burnishing, which is very simple and effective method for improvement in surface finish and can be carried out on lathe machine. The latest innovate technique used in the burnishing is the cryogenic burnishing in which the liquid nitrogen is supplied as the coolant. This work deals with study of different burnishing processes of titanium alloy Ti-6Al-4V.

scholarly journals Review on different welding techniques of Titanium and its alloys

2020 ◽  
pp. 286-294
Author(s):  
Malis Krishna Prasad Reddy ◽  
Ramawath Prashanth Naik ◽  
Madhukar Samatham ◽  
Chelluboina Harish Kumar
Keyword(s):  
Creep Property ◽  
Notch Toughness ◽  
Aerospace Engineering ◽  
Dissimilar Metals ◽  
Nuclear Engineering ◽  
High Tendency ◽  
Atmospheric Air ◽  
Welding Defects ◽  
Good Biocompatibility ◽  
Very High

Titanium and its alloys are the most commonly and most widely used due to its significant properties like good biocompatibility , good tensile strength , low density , and good creep property up to 300 degrees centigrade .It is used in the major engineering fields like civil engineering , nuclear engineering , aerospace engineering etc., but the welding of titanium in industries has become a major challenging objective to the fabricators because, a lot of titanium alloys are found in the form of sheets , problem arises mainly while fabricating the space crafts , marine bodies , jet engine’s where the ends are need to be joined through welding with a similar or dissimilar metals and titanium possess to have a very high tendency to oxidize at higher temperatures .As Titanium becomes highly reactive to chemicals in its environment. In regular air, welding contaminates titanium with carbides, nitrides, and oxides that make the weld and HAZ (heat-affected zone) brittle, resulting in lower fatigue resistance and notch toughness. so, In order to get a perfect weld it is very important to avoid the molten metal to the exposure of atmospheric air , which will lead to porosity and results into a poor welding conditions or welding defects. This paper reviews the different methods of welding titanium and its alloys.

Characterization of machined polystyrene foam

1989 ◽  
Vol 47 ◽  
pp. 372-373
Author(s):  
C. W. Price ◽  
E. F. Lindsey ◽  
R. M. Franks ◽  
M. A. Lane
Keyword(s):  
Surface Finish ◽  
Cell Walls ◽  
Surface Structures ◽  
Efficient Technique ◽  
Low Density ◽  
Polystyrene Foam ◽  
Planar Surfaces ◽  
Machining Characteristics

Diamond-point turning is an efficient technique for machining low-density polystyrene foam, and the surface finish can be substantially improved by grinding. However, both diamond-point turning and grinding tend to tear and fracture cell walls and leave asperities formed by agglomerations of fragmented cell walls. Vibratoming is proving to be an excellent technique to form planar surfaces in polystyrene, and the machining characteristics of vibratoming and diamond-point turning are compared.Our work has demonstrated that proper evaluation of surface structures in low density polystyrene foam requires stereoscopic examinations; tilts of + and − 3 1/2 degrees were used for the stereo pairs. Coating does not seriously distort low-density polystyrene foam. Therefore, the specimens were gold-palladium coated and examined in a Hitachi S-800 FESEM at 5 kV.

scholarly journals Mechanical Properties of Additively Manufactured Thermoplastic Polyurethane (TPU) Material Affected by Various Processing Parameters

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3010
Author(s):  
Tao Xu ◽  
Wei Shen ◽  
Xiaoshan Lin ◽  
Yi Min Xie
Keyword(s):  
Mechanical Properties ◽  
Medical Devices ◽  
Thermoplastic Polyurethane ◽  
Critical Factor ◽  
Processing Parameters ◽  
Aerospace Engineering ◽  
Post Processing ◽  
Build Orientation ◽  
Good Biocompatibility ◽  
Material Tests

Thermoplastic polyurethane (TPU) is a polymer material that has high ductility, good biocompatibility and excellent abrasion resistance. These properties open a pathway to manufacturing functional TPU parts for applications in various fields such as aerospace engineering, medical devices and sports equipment. This study aims to investigate the mechanical properties of additively manufactured TPU material affected by three different processing parameters, including build orientation, mix ratio of the new and reused powders and post-processing. A series of material tests are conducted on TPU dumb-bell specimens. It is found that the mix ratio of the new powder is the most critical factor in improving the mechanical properties of the printed TPU parts. Compared to reused powder, new powder has better particle quality and thermal properties. Besides, build orientation is also a very important factor. TPU parts printed in flat and on-edge orientations show better tensile strength and deformability than those printed in upright orientation. In addition, post-processing is found to significantly enhance the deformability of TPU parts.

Cylindrical Concentricity and Coaxiality Optimization for Boring Process by Using Taguchi Method

2020 ◽  
Vol 17 (2) ◽  
pp. 707-714
Author(s):  
Allina Abdullah ◽  
B. M. Khirulrizwan ◽  
Afiqah Azman
Keyword(s):  
Taguchi Method ◽  
Surface Finish ◽  
Optimum Parameter ◽  
Cutting Parameters ◽  
Numerical Control ◽  
Machining Process ◽  
Good Surface ◽  
Lathe Machine ◽  
Good Surface Finish ◽  
Coated Carbide

Machining is the process where the material on the surface of the workpiece is being removed through application of force and relative moment. Machining process involves a lot of process parameters. The utmost important thing in machining process is to achieve accurate dimensions and good surface finish where its lead to produce the high-quality product. A good surface finish is one of the factors that greatly influence manufacturing cost and also describes the geometry of the machined surface combine with the surface texture. This experimental research has been conducted in order to determine the optimum parameter involved that could affect the Concentricity and Coaxiality value by using Taguchi Method. To select the cutting parameters properly, the researcher collects the previous study to select the cutting parameters involving in Boring Operation of Computer Numerical Control (CNC) Lathe machine. Based on the collected previous study, it is shown that best cutting parameters used for the boring process are cutting speed, feed rate and depth of cut and using these cutting parameters as the controllable factor in this experiment. The researcher also uses the different type of materials which are Aluminum Alloy 6061, Mild Steel and Carbon Steel. This experiment also used only one type of cutting tools which is cemented coated carbide. Taguchi Method approach has been used to achieve the best-intended models and analyze the optimum parameter for the boring process by measure its concentricity and coaxiality of the workpiece. There are 9 workpieces been run in Conventional Lathe machine after been designed from the Computer-Aided Design (CAD). Analysis of Variance (ANOVA) and main effect plot been analyzed to find out the significant factor that affects the concentricity and coaxiality.

Influence of Cam Surface Finish and Roughness on Frictional Power Loss in Valve Trains With Roller Tappets

2005 ◽  
Author(s):  
Mitsuhiro Soejima ◽  
Masashi Nagafuji ◽  
Eiji Ogawa ◽  
Takeshi Kuwahara
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Power Loss ◽  
Internal Combustion Engines ◽  
Rolling Contact ◽  
Sliding Contact ◽  
Valve Train ◽  
Friction Loss ◽  
Combustion Engines ◽  
Cam Follower

In order to reduce the frictional power loss and the wear in the valve train of internal combustion engines, the cam follower mechanism tends to be shifted from the sliding contact to the rolling contact such as a roller follower [1–5]. Design criteria for the valve train with roller tappets have been investigated by making obvious the effect of the cam lobe surface finish and its surface roughness on reduction of the friction loss. In particular the friction loss in the case of a cam lobe finished by shot-peening was compared with that of one finished by grinding. Also the influence of surface roughness on the friction loss was examined.

scholarly journals Application of ANN in prediction of response parameters in CNC Turning

2021 ◽  
Vol 309 ◽  
pp. 01006
Author(s):  
Raman Kumar ◽  
Jasgurpreet Singh Chohan ◽  
Sandeep Singh ◽  
Jatinder Kaur
Keyword(s):  
Neural Network ◽  
Surface Finish ◽  
Manufacturing Industry ◽  
Removal Rate ◽  
Research Work ◽  
Advanced Technology ◽  
Data Set ◽  
Lathe Machine ◽  
Predicted Values ◽  
Quality Material

Product surface quality material removal rate play a great role in the current manufacturing industry. The use of artificial intelligence becomes immensely important component in research work. . In today advanced technology era, the use of CNC in lathe is common and essential to enhance the productivity of manufacturing industry. In this research work, the application of artificial neural network has been shown to predict the values of surface finish and MRR during turning operation on a CNC lathe machine. The association between process variables and response variables through hidden layers has been presented. The experimental data set was used for training (70%), testing (15%) and validation (15%) of neural network. The measured values are compared with the predicted values and percentage of predicated errors are computed. In present work, a neural network is developed and trained, tested and validated with the help of MATLAB. The study can be beneficial for estimation of surface finish of products during commercialization which would reduce the manufacturing coat and time.

Application of Improved Voltage Compensation in the SEM to Imaging of Organic Materials

1973 ◽  
Vol 31 ◽  
pp. 444-445
Author(s):  
P.J. Killingworth ◽  
M. Warren
Keyword(s):  
Electron Beam ◽  
Organic Materials ◽  
Operating Parameters ◽  
Low Density ◽  
Beam Diameter ◽  
Incident Electron Beam ◽  
Specimen Material ◽  
Voltage Compensation ◽  
Selection Of ◽  
Scanning Electron

Ultimate resolution in the scanning electron microscope is determined not only by the diameter of the incident electron beam, but by interaction of that beam with the specimen material. Generally, while minimum beam diameter diminishes with increasing voltage, due to the reduced effect of aberration component and magnetic interference, the excited volume within the sample increases with electron energy. Thus, for any given material and imaging signal, there is an optimum volt age to achieve best resolution.In the case of organic materials, which are in general of low density and electric ally non-conducting; and may in addition be susceptible to radiation and heat damage, the selection of correct operating parameters is extremely critical and is achiev ed by interative adjustment.

Quantitative defect studies in semiconductor TEM samples prepared by low angle ion milling

1995 ◽  
Vol 53 ◽  
pp. 512-513
Author(s):  
L. Mulestagno ◽  
J.C. Holzer ◽  
P. Fraundorf
Keyword(s):  
Sample Preparation ◽  
Milling Time ◽  
High Density ◽  
Low Density ◽  
Ion Milling ◽  
High Quality ◽  
Variable Angle ◽  
Major Disadvantage ◽  
Induced Defects

Due to the wealth of information, both analytical and structural that can be obtained from it TEM always has been a favorite tool for the analysis of process-induced defects in semiconductor wafers. The only major disadvantage has always been, that the volume under study in the TEM is relatively small, making it difficult to locate low density defects, and sample preparation is a somewhat lengthy procedure. This problem has been somewhat alleviated by the availability of efficient low angle milling.Using a PIPS® variable angle ion -mill, manufactured by Gatan, we have been consistently obtaining planar specimens with a high quality thin area in excess of 5 × 104 μm2 in about half an hour (milling time), which has made it possible to locate defects at lower densities, or, for defects of relatively high density, obtain information which is statistically more significant (table 1).

Intralysosomal Accumulation of Colloidal Gold-Low Density Lipoprotein Conjugates in Chloroquine-Treated Fibroblasts

1985 ◽  
Vol 43 ◽  
pp. 546-547 ◽  
Author(s):  
Dean A. Handley ◽  
Cynthia M. Arbeeny ◽  
Larry D. Witte
Keyword(s):  
Colloidal Gold ◽  
Cultured Cells ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Coated Vesicle ◽  
Low Density ◽  
Cholesterol Esters ◽  
Cultured Fibroblasts ◽  
Surface Receptors ◽  
Ldl Particles

Low density lipoproteins (LDL) are the major cholesterol carrying particles in the blood. Using cultured cells, it has been shown that LDL particles interact with specific surface receptors and are internalized via a coated pit-coated vesicle pathway for lysosomal catabolism. This (Pathway has been visualized using LDL labeled to ferritin or colloidal gold. It is now recognized that certain lysomotropic agents, such as chloroquine, inhibit lysosomal enzymes that degrade protein and cholesterol esters. By interrupting cholesterol ester hydrolysis, chloroquine treatment results in lysosomal accumulation of cholesterol esters from internalized LDL. Using LDL conjugated to colloidal gold, we have examined the ultrastructural effects of chloroquine on lipoprotein uptake by normal cultured fibroblasts.

ALCHEMI of B2-Ordered Fe50Al45Me5 alloys

1996 ◽  
Vol 54 ◽  
pp. 548-549
Author(s):  
Ian M. Anderson
Keyword(s):  
Room Temperature ◽  
Iron Aluminide ◽  
Low Density ◽  
Intermetallic Alloys ◽  
Practical Applications ◽  
Alloying Additions ◽  
Site Distribution ◽  
Good Corrosion Resistance ◽  
Room Temperature Ductility ◽  
The Matrix

B2-ordered iron aluminide intermetallic alloys exhibit a combination of attractive properties such as low density and good corrosion resistance. However, the practical applications of these alloys are limited by their poor fracture toughness and low room temperature ductility. One current strategy for overcoming these undesirable properties is to attempt to modify the basic chemistry of the materials with alloying additions. These changes in the chemistry of the material cannot be fully understood without a knowledge of the site-distribution of the alloying elements. In this paper, the site-distributions of a series of 3d-transition metal alloying additions in B2-ordered iron aluminides are studied with ALCHEMI.A series of seven alloys of stoichiometry Fe50AL45Me5, with Me = {Ti, V, Cr, Mn, Co, Ni, Cu}, were prepared with identical heating cycles. Microalloying additions of 0.2% B and 0.1% Zr were also incorporated to strengthen the grain boundaries, but these alloying additions have little influence on the matrix chemistry and are incidental to this study.

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