Study of the Tubular Billets Geometric Characteristics during Computer Simulation of the Rotary Piercing Process

2019 ◽  
Vol 946 ◽  
pp. 788-793
Author(s):  
Vladimir A. Toporov ◽  
Aleksandr Bogatov ◽  
Danis Nukhov
Keyword(s):  
Computer Simulation ◽  
Contact Surface ◽  
Research Methodology ◽  
Deformation Zone ◽  
Rotation Frequency ◽  
Step Length ◽  
Geometric Characteristics ◽  
Feed Angle ◽  
Tubular Billet ◽  
Surface Length

The results of the computer simulation of the tubular billet rotary piercing process are presented. The research methodology of the deformation zone geometric ratios with due regard for the tubular billet change of shape at each helical curve step was developed .The changes pattern of the helical curve step length (li), quotient reduction (Δr/r0), ratio of the tubular billet radius to the contact surface width (r/b), contact surface length of the tubular billet (l0) with a roll, depending on the feed angle (β), roll rotation frequency (N) and plug nose extension at the gorge (Сg) was established.

scholarly journals Bondgraph modelling and simulation of the dynamic behaviour of above-knee prostheses

1987 ◽  
Vol 11 (2) ◽  
pp. 65-70 ◽  
Author(s):  
P. G. Van De Veen ◽  
W. Van Der Tempel ◽  
J. De Vreiss
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Mass Distribution ◽  
Total Mass ◽  
Dynamic Behaviour ◽  
Step Length ◽  
Swing Phase ◽  
Knee Prostheses ◽  
Prosthetic Foot ◽  
Walking Velocity

A mathematical model was used to investigate the dynamic behaviour of an above-knee (AK) prosthesis in the swing phase and to analyse the influence of mass and mass distribution on the maximal stump load and the required energy. The model consists of a bondgraph model of the prosthesis and a “walking” model which predicts the walking velocity, step length and the femoral trajectory. Equipment was developed to measure the inertial properties of the components of the prosthesis. Through computer simulation, stickdiagrams of the swing phase and graphs of the variation with time of the hip and stump forces were obtained. It was found that for a normal AK prosthesis with a knee-lock mechanism the axial stump load is greatest at the beginning and at the end of the swing phase. At a walking velocity of 5 km/hr the maximum axial stump load amounts to 2.1 times the static weight of the prosthesis. The maximum axial stump force appeared to be almost directly proportional to the total mass of the prosthesis but independent of the mass distribution. The required energy also increased with the mass of the prosthesis but is' dependent on mass distribution. Because of their comparable weights the influence of the shoe is almost equal to the influence of the prosthetic foot. Thus lightweight shoes should be used with lightweight prosthetic feet in order to add to their advantages.

Arithmetic Research of Computer Simulation of the Bus Junction Stations

2010 ◽  
Vol 108-111 ◽  
pp. 441-445
Author(s):  
Yong Luo ◽  
Xiu Chun Guo
Keyword(s):  
Computer Simulation ◽  
Normal Distribution ◽  
Exponential Distribution ◽  
Poisson Distribution ◽  
Computer Model ◽  
Time Distribution ◽  
Random Variables ◽  
Step Length ◽  
Negative Exponential Distribution ◽  
Negative Exponential

This paper will construct a discrete system's computer model, include the time distribution of buses arrive, stop and passengers’ get down and get off. The emulation clock advanced with the method of incident step length. Through the inversion produce the random variables of Poisson distribution, negative exponential distribution and normal distribution, simulate the conditions of bus arrive, leave and pick up passengers. Finally calculate with the relative data and then get a series of indicators to evaluate the crowing degree of the bus station.

scholarly journals Computer simulations as interactive method training In the course of preparation bachelors of law

2017 ◽  
Vol 5 (2) ◽  
pp. 105-117
Author(s):  
Иван Иванов ◽  
Ivan Ivanov ◽  
Алексей Кусков ◽  
Aleksey Kuskov
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Research Methodology ◽  
Systematic Approach ◽  
Scheduling Algorithm ◽  
Interactive Methods ◽  
Theoretical Knowledge ◽  
Logical Method ◽  
Definition Of ◽  
Effective Use

The aim of the article is to examine the computer simulations as one of the interactive methods of training and formulate proposals for their effective use in training bachelors of law. The authors have chosen the basis of the research methodology a systematic approach using formal-logical method as well as methods of theoretical knowledge and empirical research. As a result, the authors formulated the definition of legal computer simulation, classified these simulations. The authors proposed a scheduling algorithm and conduct classes with the use of computer simulations. There are conclusions about the problems and the subsequent directions of development of computer simulation for a more effective legal system for training of bachelors, which should be according to the authors field of application of the results.

Influence of parameters of ultrasonic finishing on the roughness of machined surfaces of parts made of tool steels

2020 ◽  
Author(s):  
V.I. Malyigin ◽  
YU.I. Kuvaldin ◽  
N.S. Oblovatskaya ◽  
E.N. Lapteva ◽  
V.A. Slutskov
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Deformation Zone ◽  
Surface Hardness ◽  
Rotation Frequency ◽  
Plastic Deformation Zone ◽  
Initial Surface ◽  
Tool Steels ◽  
Machined Surfaces ◽  
Ultrasound Power

The influence of the parameters of plastic deformation by ultrasonic burnishing during finishing treatment on the surface roughness of workpieces made of Р6М5 and 9ХС steels with an initial surface hardness of 57¸60 HRC is investigated. The D-optimal Hartley—Kono plan was used in the experiments for four factors (workpiece rotation frequency, feed, loading force, ultrasound power). Keywords: ultrasonic finishing, indenter, ultrasound power, surface roughness, plastic deformation zone. [email protected]

Computer-Simulation of the Billet Shape Change during Helical Piercing

2020 ◽  
Vol 299 ◽  
pp. 386-391
Author(s):  
Vladimir A. Toporov ◽  
Aleksandr Bogatov ◽  
Danis Nukhov
Keyword(s):  
Computer Simulation ◽  
Contact Area ◽  
Shape Change ◽  
Relative Reduction ◽  
Software Methodology ◽  
Feed Angle ◽  
Metal Strain ◽  
Billet Shape ◽  
3D Software ◽  
Deform 3D

In this paper the task of the study of the deformation during helical piercing of the metal was set and solved with the use of the DEFORM-3D software. Methodology, that allows to calculate the length of helix lead along the deformation zone, as well as determine for each lead absolute and relative reduction, the width of the contact area and the metal strain refinement indicator was developed. Based on the developed methodology application the following variation regularities were established: helix lead length (li), quotient reduction (Δr/r0), ratio of the billet radius to the width of the contact area (r0/b), as well as the length of the billet contact surface (l0) with the roll in dependence of the feed angle (β), the roll number of revolutions (N) and the plug nose advancement over the gorge (Cg).

scholarly journals Modelling the effect of continuous mixer operating parameters on mixture quality

2020 ◽  
Vol 164 ◽  
pp. 08009
Author(s):  
Alexey Kaliganov ◽  
Vladimir Konovalov ◽  
Alexey Chupshev ◽  
Vyacheslav Teryushkov
Keyword(s):  
Regression Model ◽  
Research Methodology ◽  
Coefficient Of Variation ◽  
Experimental Studies ◽  
Rotation Frequency ◽  
Operating Parameters ◽  
Kinematic Parameters ◽  
Continuous Mixing ◽  
Working Element

The aim of the research was to obtain a regression model of the influence of some structural and kinematic parameters of a continuous mixer working element on the quality of the prepared mixture. The research methodology included the analysis of the design of the mixing unit and the identification of factors that could significantly affect the quality of the mixture. Later, on the basis of the experimental studies, the quality of the mixture at given values of factors was determined and a regression model was established. The developed functional diagram of a continuous mixing unit made it possible to establish factors that most intensively affected the quality of the prepared mixture. The obtained adequate regression model of the coefficient of variation of the content of the control component in the samples of the mixture indicated an improvement in the quality of the mixture with an increase in the frequency of rotation of the mixers and the number of the arms levels. In terms of quality indicators, a rotation frequency of about 1500 rpm was most preferable with a number of mixer levels of at least 5.

scholarly journals Comparative analysis of damage criteria for screw rolling using computer simulation

2020 ◽  
pp. 29-32
Author(s):  
M. M. Skripalenko ◽  
B. A. Romantsev ◽  
S. P. Galkin ◽  
M. N. Skripalenko ◽  
A. V. Danilin
Keyword(s):  
Computer Simulation ◽  
Fracture Risk ◽  
Fracture Prediction ◽  
Screw Rolling ◽  
Risk Of Fracture ◽  
Feed Angle ◽  
Experimental Rolling ◽  
Aisi 321 ◽  
Axial Fracture ◽  
Damage Criteria

Two-high screw rolling of billets was carried out using a MISIS-130D rolling mill. AISI 321 steel billets were deformed with feed angles of rolls of 6°, 12°, 18° and 24°. The diameter reduction was 17%, with the initial billets’ diameter being 60 mm. An axial fracture, the so-called Mannesmann effect, of the billets was observed after screw rolling. The experimental rolling was simulated using QForm finite element method software. Initial and boundary conditions were set in concordance with the experimental rolling. Several damage criteria were used for fracture prediction during computer simulation. The results of computer simulation of fracture prediction were compared with the billets fracture after screw rolling for stationary and non-stationary stages. The most effective parameter (in terms of fracture prediction) is triaxiality. The distribution of this parameter showed that the higher the feed angle value is, the lower the fracture risk is. Notably, the risk of fracture is lower at a stationary stage compared with the same risk of fracture at a non-stationary stage; the listed trends agree with experimental rolling results. The Oyane, Ayada, Brozzo, and Cockroft-Latham Normalized criteria are partly effective. These criteria are ineffective for fracture prediction 6 degrees feed angle of rolls because they showed that fracture is most probable at the billet’s surface, which contradicts the experimental rolling results. All these criteria are partly effective when predicting a less fracture risk at a stationary stage compared with the same criteria at a non-stationary stage or when predicting a decrease of fracture with increasing the rolls feed angle.

scholarly journals Study of stress-strain state during cross-wedge rolling with one tool

2019 ◽  
Vol 64 (2) ◽  
pp. 175-181
Author(s):  
G. V. Kozhevnikova
Keyword(s):  
Computer Simulation ◽  
Comparative Studies ◽  
Deformation Zone ◽  
Strain State ◽  
Average Stress ◽  
Cross Wedge Rolling ◽  
Axial Region ◽  
Stress Strain ◽  
Cross Rolling ◽  
Stress Strain State

The peculiarity of cross-wedge rolling with one tool is the workpiece deformation with one tool and the fact that the workpiece is not supported with the tool from the opposite side. On both sides of the tool outside the contact with the workpiece, the workpiece is fixed with pairs of upper and lower tools, by means of which the axis of the workpiece is held in a constant position. Such conditions of rolling qualitatively change the deformation zone and, as a result, the stress-strain state.The change in the stress-strain state was qualitatively estimated by comparing the fields of slip lines in the traditional two-tools cross rolling and one-tool cross rolling. One-tool cross rolling increases the normal and average stress at the contact by 7.8–14.5 %, changes the average stress of the specimen from tensile to compressive one in the axial region. This circumstance significantly increases the resource of plasticity and allows rolling metals with limited plasticity without opening the axial cavity. Comparative studies of the stress-strain state from the traditional two-tools cross-wedge rolling and one-tool cross-wedge rolling in the axial region of the workpiece have been carried out by computer simulation.

Computer Simulation of the Combined Process "Helical Rolling-Pressing"

2016 ◽  
Vol 716 ◽  
pp. 614-619 ◽  
Author(s):  
Abdrakhman Naizabekov ◽  
Sergey Lezhnev ◽  
Alexandr Arbuz ◽  
Evgeniy Panin
Keyword(s):  
Computer Simulation ◽  
Deformation Zone ◽  
Software Package ◽  
Innovation Process ◽  
Helical Rolling ◽  
Combined Process ◽  
Friction Coefficients ◽  
The Matrix ◽  
Optimal Values

In this work a simulation of the innovation process "helical rolling – pressing" in the software package Simufact.Formingwas performed. The result is several models of this process. To analyze the feasibility of the process various key parameters that have a significant impact on the implementation processwere carried out. As a result, the optimal values of friction coefficients in the rolls and in the matrix, the angle of intersection of channels in the matrix and the distance of matrix from the deformation zone of the rollswere obtained.

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