scholarly journals Influence of transverse ultrasonic vibrations on the efficiency of threaded joint assembly

2021 ◽  
Vol 346 ◽  
pp. 01028
Author(s):  
Aleksandr V. Sukhov ◽  
Boris A. Cudryashov ◽  
Aleksandr A. Nechay ◽  
Dmitriy S. Simonov
Keyword(s):  
Vibration Amplitude ◽  
Technological Parameter ◽  
Ultrasonic Vibrations ◽  
Threaded Joint ◽  
Threaded Joints ◽  
Main Technological Parameter ◽  
Joint Assembly

The disadvantages arising during assembly of threaded joints are considered. The existing methods of improving the quality of a threaded joint are analyzed and the most promising one is identified - the use of ultrasound at the assembly stage. Dependence of the unscrewing moment on the main technological parameter, which is vibration amplitude is obtained.

The Impact of Qualified Bolting Specialists on the Safe, Reliable Assembly and Operation of Bolted Flanged Connections

2015 ◽  
Author(s):  
A. Fitzgerald (Jerry) Waterland ◽  
David Lay ◽  
Michael Dodge
Keyword(s):  
Work Force ◽  
Pressure Vessels ◽  
Bolted Joints ◽  
Critical Area ◽  
Bolted Joint ◽  
Learning Program ◽  
Guideline Document ◽  
The Impact ◽  
Joint Assembly

Why do we certify welders but require no evidence of training or competence from those performing the critical bolted flanged joint assembly of pressure vessels and piping throughout the same industries? To remedy this situation ASME has recently released the first comprehensive standard in ASME PCC-1-2013 Appendix A that establishes uniform criteria, not just for the quality of the bolted joints but for the workers who assemble them. To support this critical training and qualification standard, ASME Training & Development has created a unique blended learning program for pipe fitters and mechanics to become Qualified Bolting Specialists (QBS), per the requirements outlined in PCC-1-2013 Appendix A. The purpose of this technical presentation is to explain the opportunities presented by this new standard and how industry can benefit from a better-trained work force in this critical area of bolted joint assembly. The authors have been integrally involved in the development of both the PCC-1 guideline document, and the ASME qualification program, and can authoritatively answer industry’s questions.

Research on Performance Parameters of the Piezoelectric Vibrator in Ultrasonic EDM System

2013 ◽  
Vol 694-697 ◽  
pp. 458-461 ◽  
Author(s):  
Hong Bing Wang ◽  
Zhi Rong Li ◽  
Chun Hua Sun
Keyword(s):  
Finite Element Method ◽  
Vibration Amplitude ◽  
Finite Element Method Simulation ◽  
Simulation Method ◽  
Structure Parameters ◽  
Performance Parameters ◽  
Modal Frequency ◽  
Hard Materials ◽  
Piezoelectric Vibrator

Ultrasonic EDM which is a novel machining approach for hard materials is developed quickly. In ultrasonic EDM processing the piezoelectric vibrator has a very important influence on the quality of the machining. The purpose of the paper is to study the performance parameters such as the first longitudinal modal frequency, node plane and vibration amplitude of the vibrator . Through FEM (finite element method ) simulation method the relation between structure parameters and the performance parameters are obtained. The results of the paper are very effective to design a vibrator for ultrasonic EDM.

scholarly journals Comparative study of frequency converters of three-phase electric motors in automatic control of technological parameter

2021 ◽  
Vol 2 (3) ◽  
pp. 48-56
Author(s):  
Margarita M. Blagoveshchenskaya ◽  
Mikhail V. Veselov
Keyword(s):  
Pid Controller ◽  
Technological Parameter ◽  
Test Bench ◽  
Frequency Converter ◽  
Electric Motors ◽  
Technological Parameters ◽  
Frequency Converters ◽  
Ac Motors ◽  
Three Phase

Frequency converters of asynchronous three-phase AC motors are widely used in industry, including food production. A thorough understanding of the technical capabilities of frequency converters contributes to their efficient use. This article discusses a technical comparison of two frequency converters of three-phase electric motors of the Russian company "OWEN" and the Danish company "DANFOSS" according to the criterion of the quality of regulation of the technological parameter. For comparison, a test bench was created, in which the devices were tested in turn, under the same conditions. During the preparation and implementation of testing, it turned out that the hardware capabilities of frequency converters for their use in regulating technological parameters are the same, and the parametric capabilities are different. The frequency converter of the "OWEN" company is equipped with a PI controller, and the frequency converter from "DANFOSS" is equipped with a PID controller. As the results of testing the devices show, despite 

Residual stress, tensile strength, and macrostructure investigations on ultrasonic assisted friction stir welding of AA 6061-T6

2018 ◽  
Vol 53 (7) ◽  
pp. 494-503 ◽  
Author(s):  
Iman Alinaghian ◽  
Saeid Amini ◽  
Mohammad Honarpisheh
Keyword(s):  
Residual Stress ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Weld Zone ◽  
Ultrasonic Power ◽  
Ultrasonic Vibrations ◽  
Friction Stir ◽  
Longitudinal Residual Stress ◽  
Ultrasonic Assisted

In recent decades, ultrasonic vibrations are used in manufacturing processes because they can improve tool life, material performance, and quality. One of them which can be integrated with ultrasonic vibrations is friction stir welding called ultrasonic assisted friction stir welding. In previous studies, the effect of ultrasonic vibrations on the mechanical, metallurgical, and thermal properties was investigated and there is not any residual stress investigations on ultrasonic assisted friction stir welding. Since residual stress plays an important role in performance and stability of components, the influence of ultrasonic power on the longitudinal residual stress in friction stir welding is investigated in this work. In spite of residual stress, tensile strength and quality of weldment were investigated as complementary terms to ensure successful performance of ultrasonic assisted friction stir welding. The findings indicated that high-frequency vibrations with power of 200 W can reduce the maximum tensile residual stress about 45% and significantly increase tensile strength. Also, ultrasonic vibrations prevent defect such has voids and tunnel in weld zone due to peening effect in ultrasonic assisted friction stir welding.

DEM As a Tool for Optimizing Powder Metallurgy Processes

2020 ◽  
Author(s):  
Dhanooj Bobba ◽  
Seyed A. Tabei ◽  
Miguel Pando ◽  
Harish P. Cherukuri
Keyword(s):  
Powder Metallurgy ◽  
Binary Mixture ◽  
Vibration Amplitude ◽  
Hot Isostatic Pressing ◽  
Inhomogeneous Distribution ◽  
Size Segregation ◽  
Powder Bed ◽  
Different Shapes ◽  
Effect Of The Composition

Abstract Powder metallurgy processes such as cold and hot isostatic pressing and powder-bed fusion additive manufacturing are being extensively used to produce metallic and ceramic parts due to several significant benefits these techniques provide, including reduction in wasted material, more precise handling of complicated shapes and requirement of fewer steps to achieve the final geometry and tolerance. Often the quality of the products obtained through these processes is greatly affected by the homogeneity of the feedstock powders used. But the presence of particles of different shapes and sizes in the powders may lead to inhomogeneous distribution which give rise to segregation of particles. In this study, discrete element method was used to investigate the degrees of segregation of a binary mixture in a cylindrical die with sharp stepped features. To study the effect of the composition of the binary mixture, three different mass ratios are considered in the study. In addition, vibrations are applied to the cylindrical die to increase the compaction of the particles in the stepped regions of the die. The effects of vibration amplitude and vibration frequency on the size segregation of the particles in the die are studied. At higher amplitude location dependent segregation patterns were observed.

scholarly journals The change of the properties of the turning process by introducing vibrations in the cutting zone

2018 ◽  
Vol 226 ◽  
pp. 02010
Author(s):  
Vilor Zakovorotny ◽  
Valery Gvindjiliya
Keyword(s):  
Mathematical Modeling ◽  
Nonlinear Interaction ◽  
Vibration Amplitude ◽  
Cutting Process ◽  
Output Process ◽  
Turning Process ◽  
Process Characteristics ◽  
Cutting Zone ◽  
Cutting System

The results of the research of the vibrations influence are raising in the cutting zone on the output properties of the cutting process are represented. The results of the mathematical modeling of the dynamic cutting system are represented in which the controlling oscillatory displacements are raised. The system is considered as the unity subsystem of the tool and the detail are interacting through the processing. It is shows that the additional vibrations transform in the geometry topology of the forming surface as the result of the complex nonlinear interaction of the oscillations and the forces. The additional oscillations can cause as improvement of accuracy, quality and intensity of the tool wearing as deterioration of output process characteristics depending on the parameters of the vibration (amplitude, frequency and orientation). The results of the research of the oscillations influence on the quality of the surface and the power of the irreversible transformations which characterize the cutting process state are represented.

scholarly journals Experimental Study of the Ultrasonic Vibration-Assisted Abrasive Waterjet Micromachining the Quartz Glass

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Rongguo Hou ◽  
Tao Wang ◽  
Zhe Lv ◽  
Yuanyong Liu
Keyword(s):  
Ultrasonic Vibration ◽  
Vibration Amplitude ◽  
Material Removal ◽  
Experimental Results ◽  
Machining Process ◽  
Abrasive Waterjet ◽  
Influence Of Process Parameters ◽  
Erosion Depth ◽  
System Pressure

The ultrasonic vibration is used to enhance the capability of the abrasive water micromachining glass. And, the ultrasonic vibration is activated on the abrasive waterjet nozzle. The quality of the flow is improved, and the velocity of the abrasive is increased because of the addition of the ultrasonic energy. The relevant experimental results indicate that the erosion depth and the material volume removal of the glass are obviously increased when ultrasonic vibration is working. As for the influence of process parameters on the material removal of the glass such as vibration amplitude, system pressure, distance of the standoff, and abrasive size, the experimental results indicate that the system pressure and vibration contribute greatly to the glass material removal. Also, the erosion depth and the volume of material removal are increased with the increase in the vibration amplitude and system pressure. There are some uplifts found at the edge of erosion pit. Then, it can be inferred that the plastic method is an important material removal method during the machining process of ultrasonic vibration-assisted abrasive waterjet.

scholarly journals RESULTS OF RESEARCH OF PROCESSES OF EXTRACTION OF CUT WITH IMPLEMENTATION OF ULTRASOUND OSCILLATIONS ON THE INSTRUMENT

2020 ◽  
pp. 32-43
Author(s):  
Volodymyr Rutkevych
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Contact Pressure ◽  
Physical And Mechanical Properties ◽  
Torsional Vibrations ◽  
Ultrasonic Vibrations ◽  
Thread Rolling ◽  
Deformation Processes ◽  
The Mathematical Model

The possibility of improving the quality of rubber due to the directional action of various types of ultrasonic vibrations, with the aim of forming the maximum compressive residual stresses, will ultimately improve the performance of the rize joint under variable loads. The process of rizenization using forced ultrasonic vibrations has been investigated. When compiling a mathematical model of the process of extrusion of rubber with the imposition of ultrasonic vibrations on the tool, it was assumed that the phenomenon of surface hardening has little effect on the magnitude of the contact pressure and the friction force during plastic deformation. This assumption allows us to simplify the mathematical model by not taking into account this factor. New methods of calculating the contact pressure and specific frictional force during rubber extrusion with the imposition of axial, radial and torsional vibrations are proposed. The description of the deformation processes with the superposition of ultrasonic vibrations was carried out on the basis of the rheological model of deformation of an ideal elastic-plastic body. The work developed nonlinear mathematical models for the study of plastic deformation processes, consisting of equations of tool displacement and equations taking into account the elastic-plate properties of the processed material. This structure of the mathematical model most fully reflects the processes occurring during thread rolling with the imposition of ultrasonic vibrations. As a result of the research, it has been established that the use of forced ultrasonic vibrations during machining with a tool will significantly increase the productivity, tool durability and quality of the processed surface, especially when processing with special physical and mechanical properties. In the study of the contact interaction of the tool with the part with the imposition of ultrasonic vibrations in the axial and radial directions, as well as in the imposition of torsional vibrations, it was found that the use of axial vibrations is on average 50 % more effective.

Improvement of Threaded-Joint Assembly Using Ultrasound

2021 ◽  
Vol 41 (6) ◽  
pp. 567-569
Author(s):  
R. I. Nigmetzyanov ◽  
S. K. Sundukov ◽  
A. V. Sukhov ◽  
D. S. Fatyukhin ◽  
D. S. Simonov
Keyword(s):  
Threaded Joint ◽  
Joint Assembly

FEATURES OF THE CALCULATION OF THREADED JOINTS OF SLEWING BEARINGS

2020 ◽  
pp. 22-31
Author(s):  
A.S. IVANOV ◽  
Keyword(s):  
Fatigue Strength ◽  
Safety Factor ◽  
Threaded Joint ◽  
Threaded Joints ◽  
Bearing Rings ◽  
Slewing Bearings

The particularities of loading and calculation of threaded joint for rotating and stationary related to the load of the bearing rings have been considered. The formula for calculating the safety factor of the fatigue strength of screw threaded parts has been justified.

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