scholarly journals Influence of Characteristics of the Melted Basalt on the Process of Formation of Fibers

2020 ◽  
Vol 6 (6) ◽  
pp. 15-24
Author(s):  
Zh. Aydaraliev ◽  
Yu. Ismanov ◽  
A. Kainazarov
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
Viscosity Coefficient ◽  
Mineral Wool ◽  
Fiber Formation ◽  
Hydrodynamic Resistance ◽  
Hydrodynamic Characteristics ◽  
Mineral Fibers ◽  
The Relationship

In any production of products based on mineral fibers, one of the main types of equipment included in the line for the production of fiber products is installations for forming a basalt carpet, or the so-called fiberizing chambers. The quality of finished products depends on their perfection. Currently, there are several widely used in industry methods for producing mineral fibers from melt, which determine the various types and designs of fiberization chambers. In all chambers, the formation of mineral wool carpet occurs under the influence of hydrodynamic forces. Therefore, the study of such hydrodynamic characteristics as the rate of fall of individual fibers and clumps of these fibers and the hydrodynamic resistance of the carpet are of paramount importance in the design of new and reconstruction of old chambers. In this paper, we study the relationship between the strain rate and the viscosity coefficient of basaltic melt during fiber formation using a blow head developed by the authors. The substantiation of the process of fiber formation using a blowing head is given. Relations are obtained that establish the dependence of the strain rate in the fiber stream on the viscosity of the melt. Experimental data have been obtained that can be used to evaluate the effect of a basalt deposit on the dependence of the strain rate on the viscosity of a basalt melt. It was found that high-speed deformation of the melt greatly affects the quality of the fibers and the amount of waste in the production of fibers.

Simulation of hot high-speed yielding of intermetallic titanium alloy VTI-4 under conditions of high-speed loading

2020 ◽  
Vol 0 (12) ◽  
pp. 10-16
Author(s):  
V.V. Avtaev ◽  
◽  
D. V. Grinevich ◽  
A. V. Zavodov
Keyword(s):  
Finite Element ◽  
Titanium Alloy ◽  
Strain Rate ◽  
Finite Element Simulation ◽  
Modulus Of Elasticity ◽  
High Speed ◽  
Residual Deformation ◽  
Test Results ◽  
Element Simulation ◽  
The Relationship

Yielding tests of VTI-4 alloy specimens have been carried out at temperature 1010 °C under conditions of high-speed loading. Based on the test results the modulus of elasticity as well as axial and radial residual deformation values in the end and central zones for each loading stage were determined. Fitting criteria for finite element simulation and the experiment are proposed with tracing VTI-4 alloy diagram deformation at temperature 1010 °C and strain rate of 2.5 sec–1. As a result of finite element simulation the relationship between the material structures obtained during high-speed yielding and the deflected modes in different zones was determined.

scholarly journals Evaluation of mineral fiber properties using x-ray fluorescence analysis and measurement of natural radioactivity

2018 ◽  
Vol 170 ◽  
pp. 03018 ◽  
Author(s):  
Andrey Medvedev ◽  
Ekaterina Bobrova ◽  
Alexey Poserenin ◽  
Ervand Zarmanyan
Keyword(s):  
Fluorescence Analysis ◽  
Mineral Wool ◽  
Factors Affecting ◽  
Mineral Fibers ◽  
X Ray ◽  
Fiber Properties ◽  
Building Systems ◽  
Heavy Metal Oxides

The article analyzes the factors affecting the longevity of insu-lating systems and the operational resistance of products based on mineral fibers. It is emphasized that the ratio of acid oxides contained in the charge to the main oxides is the main factor influencing the operational resistance of mineral fibers, as well as the energy intensity of their production. A hy-pothesis has been put forward and confirmed that the operational resistance of a fiber depends on the content of heavy metals (their oxides) in the ini-tial charge. Determination of the elemental composition of stone wool samples was carried out by X-ray fluorescence analysis. Conducted sam-ples with a different acidity module of the study, show, that the fibers are safe by radiation indices, and their operational resistance can be affected by heavy metal oxides. It is substantiated that the durability of building systems in which mineral wool products are used as thermal insulation is determined by the properties of mineral wool products, the literacy of de-sign solutions and the quality of installation. The properties of mineral wool products, including their operational resistance, depend on the prop-erties of mineral fibers and the observance of technological regimes both on the fact of the most complete curing of the binder and on the features of formation of the volume-oriented structure of the mineral wool carpet.

scholarly journals Morphology of Cleaved Surface and Observation of In Situ Crack Propagation During Cleaving

2021 ◽  
Vol 15 (4) ◽  
pp. 483-491
Author(s):  
Soshi Iwatsuki ◽  
Hirofumi Hidai ◽  
Souta Matsusaka ◽  
Akira Chiba ◽  
Noboru Morita ◽  
...  
Keyword(s):  
Crack Propagation ◽  
High Speed ◽  
Workpiece Material ◽  
Jet Cooling ◽  
Cleavage Line ◽  
The Relationship ◽  
Glass Edge ◽  
Polarization Camera

In laser cleaving, the thermal stress caused by laser heating and water-jet cooling propagates previously induced cracks in the workpiece material. The laser-cleaving conditions affect the quality of the fracture surface, and therefore, elucidating the relationship between the cleaved surface, cleaving conditions, and crack propagation is essential. Against this backdrop, in this study, we investigated the morphology of the cleaved surface and visualized the crack propagation and stress in situ using a high-speed polarization camera. The distance between the glass edge and cleaved surface was varied. When the laser-cleavage line was close to the glass edge, twist hackles were formed on the cleaved surface. The area in which the twist hackles formed on the cleaved surface coincided with the lagging section of the crack front. Furthermore, the twist hackle reached the specimen surface, and the edge of the surface exhibited a sawtooth shape. Observations with the high-speed polarization camera revealed that the internal stress was asymmetric with respect to the crack when the twist hackles were formed.

Research on the Characteristics of Water in the Sleeper Void of Double-Block Ballastless Track

2014 ◽  
Vol 501-504 ◽  
pp. 1892-1896 ◽  
Author(s):  
Kun Xu
Keyword(s):  
High Speed ◽  
Water Pressure ◽  
Free Water ◽  
Service Condition ◽  
Hydrodynamic Characteristics ◽  
Ballastless Track ◽  
Breakage Rate ◽  
The Rich ◽  
Accelerate Crack Growth

According to the investigation and survey of the service condition of the double-block ballastless track in China, the breakage rate in the rich rainfall areas or the poor drainage lots of double-block ballastless track runs much faster than the dry areas. Some typical diseases, such as sleeper loose, contact loss between sleeper and roadbed slab, will lead to water still in the sleeper void. Free water underneath the sleepers would become dynamic water with certain pressure and flow rate under the high speed and high frequency action of train loads. Dynamic water is able to accelerate crack growth rate and scour the bonding interfaces between sleeper and roadbed slab[1,, affecting the safety ,durability and riding quality of track structure. It is meaningful for us to research on sleeper loose of double-block ballastless track under the coupling action of train load and dynamic water and prove the mechanism of sleeper loose in double-block ballastless track under action of dynamic water. Calculating the value of water pressure and velocity of flow and then providing references for study on the hydrodynamic characteristics.

The Study of New Trend for DSC Scene Effects Technology

2011 ◽  
Vol 225-226 ◽  
pp. 1284-1287
Author(s):  
Wei Ming Yeh
Keyword(s):  
High Speed ◽  
Steady Motion ◽  
Image Sensor ◽  
Camera System ◽  
Cmos Sensor ◽  
Industry And Education ◽  
New Generation ◽  
The Relationship ◽  
Potential Customers

Since early 2007, many ambitious DSC manufactures in Japan have paid special attention for built in digital effects, in order to create better quality of picture, such as: Face Detection, Smile Shutter Mode, Full frame CCD, Anti Shake system, Live View, CMOS sensor..., which were highly appreciated by many photo fans around the world, and created hot-selling record on favorite model. In fact, these fancy “Digital Technologies” could be standardized in selected new cameras right now. In late 2009, new artificial intelligence image chips such as: back-illuminated CMOS image sensor, 30x Optical Zoom (or more), Full HD Video, Sweep Panorama, Interchangeable Unit Camera System,Super High Speed ISO, Super Steady, Motion Remover.., have been promoted in new generation of camera. It could change not only the performance of new camera (DSC/DC) but to challenge the current DV market seriously, and may inspire new record-high selling again. In our experiment, we collect more than 300 cases from the telephone survey during Sep, 2010 and Dec, 2010. Total of 220 cases comply with the conditions. To probe mainly into the relationship between new generation DC Confidence level and 3 potential customers: Amateur Photographer (AP), Senior Photographer (SP), and college student (CS). That is the reason what we are probe into this highly competitively market with brilliant creative design, and hope to offer an objective suggestion for both industry and education administers.

Ship Hull Drag Reduction Using Bottom Air Injection

2007 ◽  
Author(s):  
Ahmad Fakhraee ◽  
Manoucher Rad ◽  
Hamid Amini ◽  
Mehdi Rishehri
Keyword(s):  
Drag Reduction ◽  
High Speed ◽  
Frictional Resistance ◽  
Air Injection ◽  
Hydrodynamic Resistance ◽  
Alternative Form ◽  
Hydrodynamic Characteristics ◽  
Air Cavity ◽  
Marine Vehicles ◽  
Wetted Surface Area

Air cavity ship concept has received some interest due to its potential on viscous resistance reduction for high speed craft. Air-cavity ships (ACS) are advanced marine vehicles that use air injection at the wetted hull surfaces to improve a vessel’s hydrodynamic characteristics. Air is supplied through nozzles under a profiled bottom to generate an air cavity beneath such a ship, so that a steady air layer separates a part of the bottom from contact with water, consequently reducing hydrodynamic resistance. Resistance tests were conducted with two forms: first of which was planning catamaran hull form, and second one was an alternative form with an air cavity injection under its bottom which was tested both without any air injection and with three different air injection ranges. Dead rise angle was fixed to 23 degree during both model tests. Frictional resistance was calculated from wetted surface area and compared with total resistance. It is clear from these results that improvements in high speed planning catamarans can be realized by using bottom air injection. Drag reduction achieved on these model is within 13–23 percent.

Justification of approaches to the prevention of occupational and work-related diseases in workers during production and use of artificial mineral fibers

2020 ◽  
pp. 32-40 ◽  
Author(s):  
E. Valeyeva ◽  
R. Galimova ◽  
O. Kopytenkova ◽  
A. Distanova
Keyword(s):  
Skin Neoplasms ◽  
Mineral Wool ◽  
Working Environment ◽  
Basic Principles ◽  
Mineral Fibers ◽  
Work Related ◽  
Safe Working ◽  
Artificial Mineral

Improvement of the quality of working environment by creating safe working conditions, identification and classification of risks are the basic principles for the prevention of occupational and work-related diseases in workers during production and use of artificial mineral fibers. The most important stage of prevention is therapeutic and preventive measures, including prevention of occupational skin neoplasms in the production of continuous glass fiber, prevention of dusty lung diseases when using mineral wool, vibration- and noise-induced diseases, organization of therapeutic and preventive nutrition.

Dry WEDM in Improving HS-WEDMed Surface Quality

2008 ◽  
Vol 392-394 ◽  
pp. 624-628 ◽  
Author(s):  
Tong Wang ◽  
Yu Mei Lu ◽  
Shuang Shuang Hao ◽  
Shu Qiang Xie ◽  
Xiao Cun Xu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Material Removal ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Dry Wedm ◽  
Finish Cut ◽  
The Relationship

This paper studies the surface quality of mould steel with high-speed wire electrical discharge machining (WEDM) method, which is conducted in gas to improve the accuracy of finish cut, and compares the surface quality in atmosphere and in emulsion dielectric. Experiment results showed that WEDM in atmosphere offers advantages such as better surface roughness and higher material removal rate. The relationship about winding speed and worktable feed on WEDMed surface quality in semi-finishing cut and finishing cut had been obtained. Morover, a new attemption was successful in applying dry WEDM in multiple cut to improve surface roughness.

scholarly journals Influence of Tool Balancing in High Speed Machining

2014 ◽  
Vol 65 (1) ◽  
pp. 7-12
Author(s):  
Klaudia Bašovská ◽  
Jozef Peterka
Keyword(s):  
High Speed ◽  
Cutting Tools ◽  
Small Mass ◽  
High Speed Machining ◽  
Machined Surface ◽  
Tool Vibration ◽  
Mass Unbalance ◽  
Manufacturing Technologies ◽  
The Relationship

Abstract The high speed machining (HSM) is now considered as one of the key manufacturing technologies for higher throughput and productivity. HSM used higher rotational speed of the spindle (40,000 min-1 and higher). With increasing high speed spindle rotations raises a number of dynamic forces. Even a small mass unbalance in the spindle and tooling generates tool vibration. Tool vibration shortens tool life and lowers the quality of the machined surface. It is necessary to minimize this vibration by balancing tool and tool holder. The balancing process improves the mass distribution of a cutting tool and its holder, allowing the combination of the two to rotate with the minimum amount of unbalanced centrifugal forces. Machining with balanced tool will provide better surface quality, accuracy and less tool and machine wear. In this study is focused on unbalance cutting tools, definitions, balancing techniques, sources, effects, processes and machineries. The aim of this article was to examine the relationship between unbalance and tool holders used in high speed metalworking machine tools

Optimal Design and Process Analysis of the Blade for High-Speed Shearing Stainless Steel Tube

2010 ◽  
Vol 139-141 ◽  
pp. 797-800
Author(s):  
Jun Sun ◽  
Yu Ling Wang ◽  
Bo Lu
Keyword(s):  
Stainless Steel ◽  
High Speed ◽  
Process Analysis ◽  
Steel Tube ◽  
Contour Line ◽  
Stainless Steel Tube ◽  
Finite Element Software ◽  
Chip Flow ◽  
The Relationship

This paper mainly researches on the effect from high-speed shearing tool to the quality of stainless steel tube cutting. At first, the relationship between contour line of vertical blade and the direction of shear force and chip flow are studied, and the influence on the quality of shearing caused by the size of blanking clearance is analyzed. Then a new blade contour line that made most of the iron chippings is located outside of the tube and reasonable blanking clearance is obtained. Further, based on the tearing caused by single-blade shear on the top of steel tube, the shape and angle of the vertical blade are studied, and the structure of the vertical blade nose is optimized, which improves the shearing quality of the blade. Finally, the numerical simulation of the process of shearing is done to verify the feasibility of the designed structure by the finite element software DEFORM.

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