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.

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.

scholarly journals Selected Parameters of Micro-Jet Cooling Gases in Hybrid Spraying Process

2016 ◽  
Vol 61 (2) ◽  
pp. 621-624 ◽  
Author(s):  
B. Szczucka-Lasota ◽  
T. Węgrzyn ◽  
Z. Stanik ◽  
J. Piwnik ◽  
P. Sidun
Keyword(s):  
Thermal Stress ◽  
Thermal Spraying ◽  
Innovative Technology ◽  
High Velocity Oxygen Fuel ◽  
Jet Cooling ◽  
Structure Of Coatings ◽  
The Relationship ◽  
Oxygen Fuel ◽  
Spraying Process

Abstract The innovative technology, like thermal spraying with a micro-jet cooling is one of the important modification of classical ultrasonic spraying methods. Using of micro-stream with gases like argon or nitrogen allows to cool the coating immediately after spraying, and thereby reduce the time of transition during the injection of each layer. As a result of the process, the fine dispersive structure of coatings is obtained during the shorter time in comparable to the classical high velocity oxygen fuel process (HVOF). The parameter of process and the type of stream equipment determine the quality of the obtained structure and thermal stress in the coating. The article presents the relationship between selected parameters of hybrid process and properties of the coatings. The presented technology should be adapted to the actual production of protective coating for machines and construction working in wear conditions.

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.

ON THE RELATIONSHIP BETWEEN MATURE STRUCTURE AND ONTOGENY IN THE GRANA OF CHLOROPLASTS

1967 ◽  
Vol 45 (6) ◽  
pp. 773-782 ◽  
Author(s):  
Dominick J. Paolillo Jr. ◽  
Judith A. Reighard
Keyword(s):  
Cyclical Growth ◽  
The Relationship

Some reports on chloroplast infrastructure have emphasized a helical pattern of interconnections among the compartments of the grana. This pattern has been related to a theory of spiral–cyclical growth of grana stacks. The occurrence of multiple helices on the grana in angiosperm chloroplasts impugns the ontogenetic significance of the helical pattern. The compartments of a granum do not discriminate among the helices for quantity or quality of interconnections. No genetic helix can be distinguished. The theory of spiral–cyclical growth of grana, as currently stated, is inadequate to account for the in situ structure of normal grana in the chloroplasts of angiosperms.

The Fluorescence In Situ Hybridization Approach Applied in the Study of the Denitrifying Bacteria on Nitration Tank of the Metal Membrane Bioreactor

2011 ◽  
Vol 291-294 ◽  
pp. 2686-2689
Author(s):  
Pan Zhang ◽  
Lei Chen
Keyword(s):  
Membrane Bioreactor ◽  
Denitrifying Bacteria ◽  
Ammonia Nitrogen ◽  
Space Distribution ◽  
Nitrifying Bacteria ◽  
Active Sludge ◽  
Metal Membrane ◽  
The Relationship

To study the amount changes of different denitrifying bacteria in the process of the metal membrane bioreactor, and to confirm the relationship between the amount of different bacteria and the quality of the treating water, the fluorescence in situ hybridization (FISH) dominant molecular biological technologies were applied in this study to preliminary explore the time and space distribution of different denitrifying bacteria populations in the active sludge on the immersed plate-type metal membrane bioreactor. The result indicates that the involvement of the denitrification tank is beneficial to the growth of all bacteria and nitrifying bacteria, meanwhile the eliminate rate of the total nitrogen and ammonia nitrogen is also improved.

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.

1JSC “Pluton”, 2 JSC Central Scientific Research Radio Engineering Institute named after Academician A.I.Berg

2021 ◽  
pp. 29-36
Author(s):  
P.A. Golovkin ◽  
A.V. Volkov ◽  
A.V. Krykov
Keyword(s):  
Appropriate Technology ◽  
Workpiece Material ◽  
Hot Plastic Deformation ◽  
Normative Documents ◽  
Synergistic Approach ◽  
Technological Transition ◽  
The Stability ◽  
The Cost ◽  
The Relationship

Currently, there are no normative documents regulating the appropriate technology of manufacturing parts from titanium alloys at the stage from hot plastic deformation to obtaining a machined (finished) part in terms of ensuring its high-quality surface and structure. Namely, the end-to-end effect of the transformations of the workpiece material on its characteristics formed through more than one technological transition, its heredity, is not tracked. This makes it difficult to achieve the desired characteristics of the final product and increases the cost of its manufacture. We studied VT6, a titanium alloy of medium strength, and found the relationship between the parameters of forging and the stability of the cutting process, the quality of the surface and the structure of the material of the resulting part. Technological solutions proposed on the basis of a synergistic approach should provide a balanced improvement of the specified parameters and eliminate the shortcomings of the original semi-finished product.

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