Theoretical prediction of tool-chip contact length in orthogonal metal machining by computer simulation

2002 ◽  
Vol 15 (03) ◽  
pp. 233 ◽  
Author(s):  
Lizhi Gu
Keyword(s):  
Computer Simulation ◽  
Theoretical Prediction ◽  
Contact Length ◽  
Metal Machining

The Study of Computer Simulation on Vibratory Metal Machining with Low Frequency

2007 ◽  
Vol 10-12 ◽  
pp. 286-290
Author(s):  
J.L. Song ◽  
Guang Jun Chen
Keyword(s):  
Computer Simulation ◽  
Formation Process ◽  
Chip Formation ◽  
Metal Cutting ◽  
Low Frequency ◽  
Metal Machining ◽  
Energy Consuming ◽  
Time And Energy ◽  
Insight Into ◽  
Good Agreement

Vibratory cutting is one of the newly developed machining techniques and theories in recent years. Insight into the machining mechanism and the chip formation process in metal vibratory cutting has yet to be carried out for this technique to be used widely and efficiently. But with conventional investigation, it is much difficult, and time and energy consuming to analyze and study such principles quantitatively. A system of the computer simulation has been established and based on FEM the chip formation process was emulated. The cutting forces and temperature distribution were imitated under condition of a variety of vibratory frequencies and turning engagements. ANSYS is utilized for the quantitative analysis. Contrast and comparison experiments between vibratory and the conventional metal machining are done, revealing a good agreement between the simulation and the experiment and the inborn nature and the principles of the vibratory metal cutting.

Computational aspects of tribology in metal machining

1998 ◽  
Vol 212 (4) ◽  
pp. 307-318 ◽  
Author(s):  
K Maekawa
Keyword(s):  
Computer Simulation ◽  
Tool Wear ◽  
Cutting Process ◽  
Cutting Fluid ◽  
Metal Machining ◽  
Computational Aspects ◽  
Cutting Processes ◽  
Friction And Lubrication

The present paper reviews tribological phenomena in metal machining from computational aspects. Emphasis is laid on the interaction between the mechanical aspects of tribology and the characteristics of the cutting process. Firstly, the fundamentals of the mechanics and physics of cutting processes are outlined. This is extended to friction and lubrication at the tool-workpiece interface and tool wear. On the basis of this quantitative knowledge, the interaction of tribology with a cutting process is demonstrated by means of computer simulation including machinability of free-cutting steels, cutting fluid action and prediction of tool wear. Finally, concluding remarks are devoted to the interaction of tribology with wider aspects of cutting towards the goal of ‘better machining‘.

scholarly journals Cylinder plastic compression by the flat dies

2020 ◽  
pp. 101-120
Author(s):  
Ростислав Иванович Непершин
Keyword(s):  
Computer Simulation ◽  
Plastic Deformation ◽  
Limit Load ◽  
Contact Length ◽  
Contact Friction ◽  
Plastic Layer ◽  
Cylinder Surface ◽  
Initial Contact ◽  
Rigid Plastic ◽  
Cylinder Compression

Приведено численное моделирование пластического сдавливания цилиндра плоскими штампами по нормали к его оси на основе теории плоской деформации жесткопластического тела. Рассматриваются начальная пластическая деформация с выдавливанием материала на свободную поверхность цилиндра, переходящая в пластическое деформирование высокой заготовки и пластического слоя с конечным отношением длины контакта к толщине. Используются линии скольжения и скорости пластического течения по Прандтлю при изменении формы деформируемого сечения цилиндра с учетом контактного трения при сдавливании пластического слоя. Моделирование представляет практический интерес для оценки предельной нагрузки при контактной деформации цилиндра плоскими штампами и деформировании заготовки при ковке плоскими бойками. Computer simulation of the rigid-plastic cylinder compression by the flat dies is presented using plane strain ideal plastic theory. Initial contact plastic deformation with material lip forming on the free cylinder surface, followed by the high workpiece and the plastic layer with finite contact length to thickness relation plastic deformation are considered. Prandtl’s slip lines and velocity fields are used for the cylinder section form predictions and plastic layer compression with contact friction consideration. Computer simulation can be used for the limit load estimation with cylinder contact plastic flow, compressed by the flat rigid dies, and cylinder workpiece forging by the flat dies.

Application of Plastic Boundary Layer Theory to Metal Machining

1982 ◽  
Vol 104 (4) ◽  
pp. 358-362 ◽  
Author(s):  
P. S. Jackson ◽  
P. K. Wright
Keyword(s):  
Pressure Gradient ◽  
Material Properties ◽  
Shear Zones ◽  
Contact Length ◽  
Boundary Layer Theory ◽  
Two Dimensional ◽  
Metal Machining ◽  
Plastic Zones ◽  
Thin Plastic ◽  
Good Agreement

In the metal machining operation, material is deformed at high rates in thin plastic zones. This paper explores the possibility that the features of such shear zones can be described by a theory for plastic boundary layers. The analysis draws on Oldroyd’s solution for the two-dimensional plastic flow of a Bingham solid over a flat knife. The way in which such a solution can be adapted to both the secondary and primary deformation zones in machining is described. A theoretical equation is derived that uses material properties to predict the tool-face pressure gradient along the contact length. An analysis for brass gives very good agreement between this approach and the experimental data for the tool-face pressure gradient obtained by Rowe and Wilcox.

Computer Simulation of a Fluid Flow through the Declined Porous Structure

2013 ◽  
Vol 746 ◽  
pp. 271-276 ◽  
Author(s):  
Larysa Ocheretna ◽  
David Lukáš
Keyword(s):  
Computer Simulation ◽  
Fluid Flow ◽  
Cellular Automata ◽  
Theoretical Prediction ◽  
Porous Structure ◽  
Lattice Gas ◽  
Visualization Tool ◽  
Porous Structures ◽  
Flow Through ◽  
Lattice Gas Cellular Automata

Computer simulation of a fluid flow through the declined porous structure is presented in the paper. The hypothesis related to the curious behaviour of the fluid flow inside assembled filters is verified using Lattice Gas Cellular Automata approach. Based on a set of computer simulations the reorganization of the fluid flow inside declined porous structure was obtained for different simulation setups. The results obtained from the computer simulation have shown that LGCA model is not only suitable for a theoretical prediction of a fluid flow inside porous structures but also it can be used as a visualization tool.

Characterization of Modulated Structure Through Structure Images and their Computer Simulation

1990 ◽  
Vol 48 (1) ◽  
pp. 70-71
Author(s):  
Kiyomichi Nakai ◽  
Yusuke Isobe ◽  
Chiken Kinoshita ◽  
Kazutoshi Shinohara
Keyword(s):  
Computer Simulation ◽  
High Resolution ◽  
Spherical Aberration ◽  
High Resolution Electron Microscopy ◽  
Basic Mechanism ◽  
Objective Lens ◽  
Specimen Thickness ◽  
Transmitted Beam ◽  
Modulated Structure ◽  
Resolution Electron

Induced spinodal decomposition under electron irradiation in a Ni-Au alloy has been investigated with respect to its basic mechanism and confirmed to be caused by the relaxation of coherent strain associated with modulated structure. Modulation of white-dots on structure images of modulated structure due to high-resolution electron microscopy is reduced with irradiation. In this paper the atom arrangement of the modulated structure is confirmed with computer simulation on the structure images, and the relaxation of the coherent strain is concluded to be due to the reduction of phase-modulation.Structure images of three-dimensional modulated structure along <100> were taken with the JEM-4000EX high-resolution electron microscope at the HVEM Laboratory, Kyushu University. The transmitted beam and four 200 reflections with their satellites from the modulated structure in an fee Ni-30.0at%Au alloy under illumination of 400keV electrons were used for the structure images under a condition of the spherical aberration constant of the objective lens, Cs = 1mm, the divergence of the beam, α = 3 × 10-4 rad, underfocus, Δf ≃ -50nm and specimen thickness, t ≃ 15nm. The CIHRTEM code was used for the simulation of the structure image.

Averting robo-bees: why free-flying robotic bees are a bad idea

2019 ◽  
Vol 3 (6) ◽  
pp. 723-729
Author(s):  
Roslyn Gleadow ◽  
Jim Hanan ◽  
Alan Dorin
Keyword(s):  
Climate Change ◽  
Computer Simulation ◽  
Food Security ◽  
European Countries ◽  
Plant Interactions ◽  
Plant Insect Interactions ◽  
Native Habitat ◽  
Insect Pollinators ◽  
Insect Interactions

Food security and the sustainability of native ecosystems depends on plant-insect interactions in countless ways. Recently reported rapid and immense declines in insect numbers due to climate change, the use of pesticides and herbicides, the introduction of agricultural monocultures, and the destruction of insect native habitat, are all potential contributors to this grave situation. Some researchers are working towards a future where natural insect pollinators might be replaced with free-flying robotic bees, an ecologically problematic proposal. We argue instead that creating environments that are friendly to bees and exploring the use of other species for pollination and bio-control, particularly in non-European countries, are more ecologically sound approaches. The computer simulation of insect-plant interactions is a far more measured application of technology that may assist in managing, or averting, ‘Insect Armageddon' from both practical and ethical viewpoints.

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