INFLUENCE OF THE MATRIX SHAPE ON THE TECHNOLOGICAL PARAMETERS OF THE DRAWING PROCESS

2020 ◽  
Author(s):  
I.A Tserna ◽  
◽  
O.V. Opriatkin ◽  
Keyword(s):  
Product Quality ◽  
Computer Modeling ◽  
Defect Formation ◽  
Drawing Process ◽  
Technological Parameters ◽  
Axisymmetric Part ◽  
The Matrix ◽  
Matrix Shape

The results of computer modeling of the drawing of an axisymmetric part in matrices with a cylindrical and conical working part are presented. the influence of the shape of the working part of the matrix on the processes of defect formation and product quality is established.

Positron Studies of Defects in Nitrogen and Carbon Implanted Titanium

1998 ◽  
Vol 527 ◽  
Author(s):  
M. Soltani-Farshi ◽  
H. Baumann ◽  
W. Anwand ◽  
G. Brauer ◽  
P.G. Coleman ◽  
...  
Keyword(s):  
Defect Formation ◽  
Positron Beam ◽  
Formation Processes ◽  
Slow Positron ◽  
The Matrix ◽  
Matrix Lattice ◽  
Hydrogen Accumulation ◽  
Cp Ti ◽  
Modification Of Materials ◽  
Beam Technique

ABSTRACTModification of materials by ion beams creates defects and defect formation processes. The implantation of nitrogen into titanium influences the hydrogen content in this metal. Hydrogen accumulation enhances hydrogenations in the implanted region. This effect may have important consequences, because excessive hydrogen accumulation generally leads to precipitating hydrids in the matrix lattice and the metal undergoes degradation of its mechanical properties. Many studies have shown that defects in metals trap light gas atoms like H or He which are solved or implanted in the sample. Therefore, the decoration of defects with these atoms is a method to trace defect concentrations and to study the trapping and detrapping mechanism. Mobile defects can be trapped at implanted atoms, at inhomogeneities or at inner surfaces like grain boundaries or interfaces of different phases. Using the slow positron beam technique the traps for hydrogen attributed to vacancy-type defects have been investigated in cp-Ti implanted with nitrogen or carbon.The concentration of hydrogen has been detected by the 15N profiling technique (1H(15N,αγ)12C). The nitrogen and carbon content were measured by 15N(1H,αγ)12C and 13C(p,γ)14N reaction, respectively.

Effect of Heat Treatment on Fracture during Bending in AA6016 Aluminium Alloy Sheets

2011 ◽  
Vol 488-489 ◽  
pp. 521-524
Author(s):  
Aleksandar Davidkov ◽  
Roumen H. Petrov ◽  
Peter De Smet ◽  
Leo Kestens
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Volume Fraction ◽  
Boundary Structure ◽  
Homogeneous Distribution ◽  
Fracture Mechanisms ◽  
Al Alloy ◽  
Technological Parameters ◽  
The Matrix ◽  
Strengthening Phases

The bending properties of high strength precipitation-hardening AA6016-type Al alloy thin sheets in pre-aged T4P temper state were studied in this work. Microstructural features like grain boundary particles distribution and volume fraction of the matrix strengthening phases were considered as factors controlling the mechanical properties and the fracture of this grade. Remarkable decrease in ductility, accompanied by severe deterioration of bendability occurred when coarse precipitates were found into the grain boundaries. The in-situ fracture sequence investigations as well as the post-failure surfaces observations indicated that grain boundary ductile fracture mechanisms were involved in the propagation of the cracks during bending. Heat treatment simulations were carried out and the results showed that the precise control of the technological parameters during production of these sheets is the key factor responsible for obtaining an appropriate combination of strength and bendability. Only by providing both, homogeneous distribution of the matrix strengthening phases and a favourable grain boundary structure, the severe and often contradictory requirements for the functional properties of these alloys can be successfully satisfied.

scholarly journals Enter the matrix: shape, signal and superhighway

FEBS Journal ◽  
2013 ◽  
Vol 280 (17) ◽  
pp. 4089-4099 ◽  
Author(s):  
Dane K. Lund ◽  
D. D. W. Cornelison
Keyword(s):  
The Matrix ◽  
Matrix Shape

CLASSIFICATION OF TWO-DISC COULTERS BY TECHNOLOGICAL AND DESIGN PARAMETERS

2021 ◽  
Vol 3 (144) ◽  
pp. 56-63
Author(s):  
Vladimir R. Petrovets ◽  
◽  
Nikolay I. Dudko ◽  
Viktor V. Amelichev ◽  
Vasiliy M. Kuzyur ◽  
...  
Keyword(s):  
Rational Design ◽  
Research Purpose ◽  
Design Parameters ◽  
Structural Elements ◽  
Coding System ◽  
Technological Parameters ◽  
The Matrix ◽  
Working Bodies ◽  
Individual Design

High-quality sowing of grain crops depends on the design of the working bodies of agricultural machines. Based on analytical studies, it was proposed to develop a new classification of individual structural elements of coulters and their technological parameters. (Research purpose) The research purpose is in improvement of the digital classification table of coulter signs, the structure and form of representation of which would allow easily complementing the signs characterizing the studied working body without changing its formation algorithm. (Materials and methods) The coulter can be considered as a system consisting of a combination of individual design and technological features that are closely related to each other. A two-disc coulter was analyzed according to the proposed classification, and a digital coding system was proposed. This classification allows us to include not only the known types of coulters, but also to predict new designs for the specified technologi-cal parameters. (Results and discussion) The features and properties of coulters in the matrix are located vertically and horizontally, respectively, and are considered in in-teraction, coulters of one class are associated with many features and properties of coulters of another class. This classification allows you to replace the existing large classifications with ordinary numbers, to conduct digital coding of any coulters of sowing machines. (Conclusions) The proposed classification allows us to apply digi-tal coding of the entire variety of features and properties of existing and new designs of two-disc coulters, to use computer technologies for searching, storing and pro-cessing information on them. The classification is used to select a rational design of the working body.

PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS FREE EXTRUSION PROCESS

2020 ◽  
pp. 17-24 ◽  
Author(s):  
A. L. Vorontsov ◽  
I. A. Nikiforov
Keyword(s):  
Yield Stress ◽  
Extrusion Process ◽  
Maximum Pressure ◽  
Bottom Flange ◽  
Technological Parameters ◽  
Hardening Material ◽  
Direct Extrusion ◽  
Deformation Parameters ◽  
The Matrix ◽  
Deforming Forces

The methodology for calculating the energy and deformation parameters of the processes of free extrusion of glasses with a counter-punch is described. Extrusion of both non-hardening and hardening material is considered. In the latter case, accounting for the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as the total and specific deforming forces, maximum pressure on the matrix wall, and increase in yield stress.

scholarly journals Analysis of Manufacturing Bimetallic Tubes by the Cold Drawing Process

2016 ◽  
Vol 61 (1) ◽  
pp. 241-248 ◽  
Author(s):  
D. Halaczek
Keyword(s):  
Solid State ◽  
Wall Thickness ◽  
Material Flow ◽  
Ferrous Metal ◽  
Cold Drawing ◽  
Drawing Process ◽  
Technological Parameters ◽  
Components Analysis ◽  
Copper Aluminum ◽  
Layer Composition

Drawing processes apply to obtain the bimetallic tubes from the different metals and alloys, combined in the solid state, which significantly affects the specificity of this process. The manufacturing of bimetallic tubes by drawing process depends on many factors which include: preparation of the surface of materials joined in the solid state, the geometric parameters of the working tool, technological parameters of the drawing process (drawing speed, type of lubricant, the use of back pull etc.). Generally, the cold drawing process of producing the bimetallic tubes refers to metals which have high ductility (copper, aluminum, etc.). The tube sinking (tube drawing without a mandrel) of bimetallic tubes together with joining them at the interface of the two metal in the solid-state is applied for tubes of the diameter range between 6 to 20 mm and based on of the reducing the diameter of the tube. However, a slight increase of wall thickness ca. 0.05 ÷ 0.10 mm can appear, which is not dangerous phenomenon in case of producing the bimetallic tubes by joining in the solid-state. The aim of the research was to investigate the technology of tubes drawing process from non-ferrous metal, drawing process of bimetallic tubes and the production of bimetallic tubes in layers composition: cooper Cu-ETP - brass CuZn37 and CuZn37 brass - copper Cu-ETP in the tube sinking process. The research program included: production of bimetallic tubes with a different composition (Cu- ETP-CuZn37 and CuZn37-Cu-ETP) and a different percentage of the cross-section components; analysis of changes of tube wall thickness and the layer composition of the bimetallic tube, based on measurements on the workshop microscope; analysis of the material flow in the process of the bimetallic tubes production based on the measurements results of a profilograph CP-200.

Numerical and Experimental Analysis of Wire Drawing for Hardly Deformable Biocompatible Magnesium Alloys / Numeryczna I Doswiadczalna Analiza Ciagnienia Drutu Z Trudno Odkształcalnych Biozgodnych Stopów Magnezu

2013 ◽  
Vol 58 (1) ◽  
pp. 55-62 ◽  
Author(s):  
A. Milenin ◽  
P. Kustra
Keyword(s):  
Yield Stress ◽  
Magnesium Alloys ◽  
Experimental Analysis ◽  
Wire Drawing ◽  
Drawing Process ◽  
Thin Wire ◽  
Technological Parameters ◽  
Fem Model ◽  
Experimental Part ◽  
The Relationship

In the present paper the drawing processes of thin wire of biocompatible magnesium alloys in heated die was investigated. Due to the hexagonal close packet structure magnesium alloys have low plasticity. In order to design the technological parameters the FEM model of wire drawing process in heated die and models of yield stress and ductility were developed. The relationship between technological parameters of drawing and fracture parameters was obtained based on developed models. The maps of possible elongation for MgCa0.8 and Ax30 magnesium alloys were developed using simulations. The draft schedule for final wire diameter 0.1 mm was design assisted with FEM model in experimental part of work. Based on this draft plan the drawing process from initial diameter 1.0 mm to final diameter 0.1 mm in heated die was performed in designed by author’s device.

Hydrogen in a-Si:H Deposited by 55 kHz PECVD

1998 ◽  
Vol 513 ◽  
Author(s):  
B. G. Budaguan ◽  
A. A. Aivazov
Keyword(s):  
Substrate Temperature ◽  
Structural Stability ◽  
Hydrogen Content ◽  
Hydrogen Diffusion ◽  
Defect Formation ◽  
Emission Spectra ◽  
Technological Parameters ◽  
Scanning Calorimetry ◽  
Hydrogen Incorporation ◽  
Wide Range

ABSTRACTIn this work the mechanism of hydrogen incorporation and structural stability of a-Si:H films deposited by LF 55 kHz glow discharge in a wide range of technological parameters have been investigated. The analysis of plasma emission spectra and microstructure of films measured by IR spectroscopy and atomic force microscopy were carried out. It was shown that hydrogen desorption controls the growth rate in a wide range of substrate temperature (40–325°C ) and at low values of LF power (50–200W). At the same time the abnormal increase of hydrogen content due to ion-molecule surface reactions with the increase of substrate temperature was observed. The kinetics of hydrogen diffusion and thermodynamics of defect formation in a-SiH films were determined from modeling of differential scanning calorimetry data. It is concluded that the mechanism of hydrogen incorporation leads to formation of strong Sill bonds in the material bulk and to increase of structural stability with the increase of substrate temperature despite of the increase of hydrogen content.

Influence of Thermite Reaction on the Microstructures and Properties of Cast-Infiltration Composite Layer

2012 ◽  
Vol 602-604 ◽  
pp. 18-22 ◽  
Author(s):  
Yan Yan Ren ◽  
Guo Shang Zhang ◽  
Shi Zhong Wei ◽  
Ji Wen Li ◽  
Liu Jie Xu
Keyword(s):  
Liquid Steel ◽  
Composite Layer ◽  
Thermal Compensation ◽  
High Carbon ◽  
Technological Parameters ◽  
Ceramic Phase ◽  
Thermite Reaction ◽  
Surface Composites ◽  
Carbon Ferrochrome ◽  
The Matrix

Using the steel containing 0.45 percent of carbon as matrix, high carbon ferrochrome as cast-penetrated agent, the steel-based surface composites were fabricated by conventional cast-penetrating process combined with the thermite reaction. The influence of thermite reaction on the microstructures and properties of cast-infiltration layer was researched. The results show that the interfacial bonding is metallurgical fusion between cast-infiltration layer and the matrix under the suitable technological parameters, the thermite reaction during the process of cast-penetrated realizes thermal compensation for liquid metal and improves the mobility of liquid steel by reducing oxidation film of liquid steel surface, consequently increase the thickness of cast-infiltration layer; The ceramic phase of Al2O3 which is generated during the thermite process improves the microhardness of cast-infiltration in a certain extent.

Numerical Simulation in Rear Axlecap of Automobile Drawing Process and Optimization of Technological Parameters

2010 ◽  
Vol 148-149 ◽  
pp. 1171-1176
Author(s):  
Ju Hua Huang ◽  
Li Xian Li ◽  
Ying Ying Wan ◽  
Jun Tuan Guo
Keyword(s):  
Numerical Simulation ◽  
Rear Axle ◽  
Element Model ◽  
Drawing Process ◽  
Work Efficiency ◽  
Technological Parameters ◽  
Simulation Results ◽  
Quality Of Products ◽  
The One

This paper takes the rear axle cap which is a typical automobile covering part as the research object. 3D and finite element model of it are built, and the drawing process is simulated with Dynaform, then the technological parameters are analyzed and optimized based on the simulation results, finally the part is compared with the one that is processed in practice. The results show that this method is easy and feasible, it not only increase the work efficiency greatly but also improve the quality of products.

Sign in / Sign up

Export Citation Format

Share Document