RESEARCH OF THE GEOMETRIC PARAMETERS CHANGING DURING SEPARATION THE HIGH-STRENGTH STONES MONOLITES WITH DIAMOND WIRE MACHINES

2021 ◽  
pp. 7-14
Author(s):  
Sergii Bashynskyi ◽  
◽  
Volodymyr Kotenko ◽  
Maryna Kolodiy ◽  
Viktor Pidvysotskyi ◽  
...  
Keyword(s):  
Experimental Studies ◽  
High Strength ◽  
Geometric Parameters ◽  
Cutting Process ◽  
Practical Significance ◽  
Diamond Wire ◽  
Wire Cutting ◽  
The Wire ◽  
The Relationship ◽  
Free Section

Aim. Developing the theory of diamond wire cutting of crystalline rocks for separating the facing stone blocks from the array by establishing links between individual geometric parameters of the side and the cutting process. Research methods. To achieve this aim were used the next method: analytical studies of the relationship between the geometric parameters of the process of diamond wire cutting, experimental study of the same geometric parameters of the process of diamond wire cutting of high-strength rocks to confirm or refute previously obtained analytical relationships, and statistical processing of data. Results. The length of contact of the diamond wire with the rock is an important criterion for the process of separating the blocks of facing rocks from the array. Given the unavailability of the diamond wire side in the array for direct measurement methods, there is a need for indirect determination of the contact length. It is proposed to use the length of the free section of the wire, as the total length of the wire remains unchanged during the cutting process. It is assumed that the length of the free section can be estimated by the distance between the diamond wire machine installation and the slope of the ledge. Analytical dependences between the specified sizes are considered. The existence of the obtained dependences and the strength of the correlation connection was confirmed by experimental studies in the conditions of the block quarry of the facing stone. Scientific novelty. At first time, the relationship between the distance of the diamond wire machine installation and the side of the diamond wire and the length of the free section of the diamond edging, which allows to control the length of contact of the diamond wire with rock in the cut. The obtained dependence is analyzed and it is concluded that the geometric parameters of the ledge will affect the length of the cut only in the initial stages of separation of the block of natural stone from the array. In the next stages, the length of the free section of the diamond wire depends only on the distance of the location of the diamond wire machine installation and the side of the diamond rope. Practical significance. The value of the optimal initial distance of the diamond wire machine placement to the slope of the ledge is found. The empirical dependence of the length of the free section of the diamond wire on the location of the diamond wire machine is also obtained

Experimental Studies of Glass Reinforced Aluminum (GLARE) Bolted Joint

2012 ◽  
Vol 217-219 ◽  
pp. 124-129
Author(s):  
Ji Feng Zhang ◽  
Zi Zhen Cao ◽  
Yong Gang Xie
Keyword(s):  
Impact Resistance ◽  
Experimental Studies ◽  
High Strength ◽  
Geometric Parameters ◽  
Experimental Program ◽  
Bolted Joint ◽  
Threshold Values ◽  
Tightening Torque ◽  
High Fatigue ◽  
Ply Orientation

GLARE laminates with outstanding impact resistance, high fatigue resistance and a number of excellent performances are combined by ductile aluminum layers and high strength FRP layers. An experimental program was conducted to estimate the influence of geometric parameters, ply orientation and tightening torque on the performances of GLARE bolted joint. The study showed that the parameters of GLARE bolted joint have intrinsic properties of metal bolted joint and composite bolted joint. The design threshold values including of geometric parameters, ply orientation and tightening torque were given.

Study on Electroplated Diamond Wire Saw Development and Wire Saw Wear Analysis

2009 ◽  
Vol 416 ◽  
pp. 311-315 ◽  
Author(s):  
Pei Qi Ge ◽  
Yu Fei Gao ◽  
Shao Jie Li ◽  
Zhi Jian Hou
Keyword(s):  
Current Density ◽  
High Performance ◽  
Experimental Studies ◽  
Cathode Current Density ◽  
Diamond Wire ◽  
Wire Saw ◽  
Diamond Wire Saw ◽  
Cathode Current ◽  
The Wire ◽  
Electroplating Process

Development of high performance diamond impregnated wire is the key of application for fixed-abrasive wire sawing technology. In this paper, some experimental studies were done for development of electroplated diamond wire saw by employing the bright nickel bath. The wire saw electroplating process was developed, the effects of cathode current density and time at tack-on stage on diamond grits density and adhesion between saw matrix and plating coating were discussed. The wire saw cutting experiments were carried out for analysis the used wire wear using the scanning electron microscope (SEM). The experimental results show the optimum tack-on current density to obtain the wire saw with good abrasive distribution and adhesion is 1.5~2.0A/dm2, and the time of pre-plating, tack-on and buildup is 6, 8~10 and 18min in turn. Diamond wire saw wear includes coating wear and grain-abrasion, and the primary wear form is grits pulled-out.

Design of a Multi-Axis Diamond Wire Cutting Machine

2000 ◽  
Author(s):  
Jung-Tang Huang ◽  
Yi-Sheng Cheng ◽  
Sheng-Hsiung Shih
Keyword(s):  
Machine Tool ◽  
Electrical Discharge Machine ◽  
Ccd Cameras ◽  
Diamond Wire ◽  
Conducting Materials ◽  
Wire Cutting ◽  
Tension Sensor ◽  
Discharge Machine ◽  
Cutting Zone ◽  
The Wire

Abstract This study attempts to develop a machine tool to let its cutting function and precision be able to compare with the counterpart of the wire-cut electrical discharge machine, and also can cut non-conducting materials. This machine tool is numerically controlled by a PC-based controller to cut some projected shapes defined on a single axis, dual axes or multiple axes. This machine is to use one diamond wire loop with motion in direction of Z-axis or a certain direction, to attain the function of cutting. The wire could be kept as straight as possible at the cutting zone and not to shift laterally from the feeding direction. Besides, a tension sensor based on CCD cameras is also installed to know the cutting force and reactions of the workpiece against the diamond wire so as to adjust the wire travelling speed and feedrate of the workpiece to cut the corner precisely.

scholarly journals RESEARCH OF CUTTING DATA FOR DIAMOND WIRE CUTTING OF HARD MATERIALS / KIETŲJŲ MEDŽIAGŲ PJOVIMO DEIMANTINE VIELA PJOVIMO REŽIMŲ TYRIMAS

2013 ◽  
Vol 5 (6) ◽  
pp. 648-650
Author(s):  
Rimantas Vilkelis ◽  
Vadim Mokšin
Keyword(s):  
Aluminum Oxide ◽  
Time Dependence ◽  
Diamond Wire ◽  
Average Surface ◽  
Arithmetic Average ◽  
Hard Materials ◽  
Oxide Crystal ◽  
Measurement Results ◽  
Wire Cutting ◽  
The Wire

The paper presents results of measurements of surface roughnessof clear, colorless sapphire (Al2O3 – corundum modification,aluminum oxide) crystal cut by diamond wire. The diamond wirecutting machine RTS 440 was used for research. Only verticalfeedrate of wire was varied while the wire speed, tension, cuttingmethod and cutting angle were constant. Results are presentedas graphs of dependence of arithmetic average surface profiledeviation Ra on feedrate of the diamond wire. Sapphire plateflatness measurement results are presented as well. Sapphire platecutting time dependence on feedrate of the wire was established.The most optimal feedrate range was obtained. Santrauka Straipsnyje pateikti skaidraus, bespalvio safyro (Al2O3 – korundo atmaina, aliuminio oksidas) kristalo, supjaustyto deimantine viela, paviršiaus šiurkštumo matavimo rezultatai. Tyrimui buvo naudotos deimantinės vielos pjaustymo staklės RTS 440. Bandymai buvo atliekami keičiant deimantinės vielos darbinę pastūmą ir nekeičiant vielos greičio, įtempimo, pjovimo būdo ir įsipjovimo kampo. Rezultatai pateikti kaip safyro paviršiaus vidutinio aritmetinio profilio nuokrypio Ra priklausomybės nuo vertikaliosios pastūmos grafikai. Taip pat pateikti atpjautos safyro plokštelės plokštumo matavimo rezultatai. Nustatyta safyro plokštelės atpjovimo laiko nuo pastūmos priklausomybė. Nustatytas optimaliausias pastūmų intervalas, kuriam esant gaunamas mažiausias paviršiaus šiurkštumas ir didžiausias našumas.

Analytical Force Modeling of Fixed Abrasive Diamond Wire Saw Machining With Application to SiC Monocrystal Wafer Processing

2016 ◽  
Vol 139 (4) ◽  
Author(s):  
Shujuan Li ◽  
Aofei Tang ◽  
Yong Liu ◽  
Jiabin Wang ◽  
Dan Cui ◽  
...  
Keyword(s):  
Cutting Forces ◽  
Machining Process ◽  
Force Model ◽  
Diamond Wire ◽  
Wire Saw ◽  
Diamond Wire Saw ◽  
The Wire ◽  
The Relationship ◽  
Fixed Abrasive ◽  
Analytical Force Model

Free abrasive diamond wire saw machining is often used to cut hard and brittle materials, especially for wafers in the semiconductor and optoelectronics industries. Wire saws, both free and fixed abrasive, have excellent flexibility, as compared to inner circular saws, outer saws, and ribbon saws, as they produce a narrower kerf, lower cutting forces, and less material waste. However, fixed abrasive wire saw machining is being considered more and more due to its potential for increased productivity and the fact that it is more environmentally friendly as it does not use special coolants that must be carefully disposed. The cutting forces generated during the wire saw process strongly affect the quality of the produced parts. However, the relationship between these forces and the process parameters has only been explored qualitatively. Based on analyzing the forces generated from the chip formation and friction of a single abrasive, this study derives an analytical cutting force model for the wire saw machining process. The analytical model explains qualitative observations seen in the literature describing the relationship between the cutting forces and the wafer feed rate, wire velocity, and contact length between the wire and wafer. Extensive experimental work is conducted to validate the analytical force model. Silicon carbide (SiC) monocrystal, which is employed extensively in the fields of microelectronics and optoelectronics and is known to be particularly challenging to process due to its extremely high hardness and brittleness, is used as the material in these experimental studies. The results show that the analytical force model can predict the cutting forces when wire saw machining SiC monocrystal wafers with average errors between the experimental and predicted normal and tangential forces of 9.98% and 12.1%, respectively.

A method to optimize the diamond wire cutting process

2017 ◽  
Vol 71 ◽  
pp. 90-97 ◽  
Author(s):  
S. Turchetta ◽  
L. Sorrentino ◽  
C. Bellini
Keyword(s):  
Cutting Process ◽  
Diamond Wire ◽  
Wire Cutting

DEVELOPMENT OF THE SOCKET MODULE OF THE ELECTRICAL NETWORK

2021 ◽  
pp. 102-109
Author(s):  
Oleh Zemlianskyi ◽  
◽  
Oleh Miroshnyk ◽  
Tetiana Kostenko ◽  
◽  
...  
Keyword(s):  
Experimental Studies ◽  
Transmission Mechanism ◽  
Practical Significance ◽  
Electrical Network ◽  
Laboratory Research ◽  
Electrical Networks ◽  
Short Circuits ◽  
The Wire ◽  
Abrasive Cutting ◽  
Safe Working

Purpose of the work is to determine the method of emergency de-energization of the object by cutting stranded live wires without the manifestation of emergency modes of electrical networks. Methods. As research methods, a comprehensive approach is used, which includes the analysis of research on emergency de-energization, laboratory research to determine a safe way to cut stranded wires under voltage. Results. De-energizing various objects during rescue operations and firefighting is one of the important tasks that must be performed in order to create safe working conditions for rescuers themselves. It is established that one of the ways by which it is possible to cut live multicore wires without short circuits is the use of abrasive cutting discs made of rotating electrocorundum. The design of a device for trouble-free cutting of live wires, which has a rod, a cutting element, a transmission mechanism and a device for fixing the wire. In the middle of the rod is a transmission mechanism, which is used as a shaft, one end of which is connected to the motor, and the other end through a gearbox, which is fixed to the device for fixing the wire, with a cutting element. In the laboratory conducted experimental studies that showed that the cutting of wires occurs without the manifestation of dangerous factors of electric current – short circuits, sparks, electric arcs. Scientific novelty. Approaches to cutting live multicore wires with corundum disks are substantiated, which excludes the occurrence of emergency modes of electrical networks, in particular short circuits. Practical significance. The obtained results can be used to create tools for safe emergency de-energization, which creates the preconditions for improving the safety of this type of work.

Editor’s Pick: Regulatory and Ethical Issues in the New Era of Radiomics and Radiogenomics

EMJ Radiology ◽  
2020 ◽  
Author(s):  
Filippo Pesapane
Keyword(s):  
Ethical Issues ◽  
Medical Images ◽  
Practical Significance ◽  
Innovative Technology ◽  
New Era ◽  
Naked Eye ◽  
Disease Characteristics ◽  
The Future ◽  
Using Data ◽  
The Relationship

Radiomics is a science that investigates a large number of features from medical images using data-characterisation algorithms, with the aim to analyse disease characteristics that are indistinguishable to the naked eye. Radiogenomics attempts to establish and examine the relationship between tumour genomic characteristics and their radiologic appearance. Although there is certainly a lot to learn from these relationships, one could ask the question: what is the practical significance of radiogenomic discoveries? This increasing interest in such applications inevitably raises numerous legal and ethical questions. In an environment such as the technology field, which changes quickly and unpredictably, regulations need to be timely in order to be relevant.  In this paper, issues that must be solved to make the future applications of this innovative technology safe and useful are analysed.

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