scholarly journals Numerical Analysis and Experimental Study of Thread Rolling Process for Micro-sized Screws(Part II: Application to a Micro-screw with Diameter of 800㎛)

2012 ◽  
Vol 21 (3) ◽  
pp. 179-185 ◽  
Author(s):  
J.H. Song ◽  
J. Lee ◽  
H.J. Lee ◽  
G.A. Lee ◽  
K.D. Park ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Analysis ◽  
Rolling Process ◽  
Thread Rolling

scholarly journals The numerical analysis of the trapezoidal thread rolling process

PAMM ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 4010027-4010028
Author(s):  
Krzysztof Kukielka ◽  
Leon Kukielka
Keyword(s):  
Numerical Analysis ◽  
Rolling Process ◽  
Thread Rolling

scholarly journals Influence of Die Threading and Finishing Length in the Thread-Rolling Process Using Flat Dies: A Numerical Analysis

2021 ◽  
Author(s):  
L. Giorleo ◽  
M. Cartapani
Keyword(s):  
Numerical Analysis ◽  
Analytical Method ◽  
Rolling Process ◽  
Die Geometry ◽  
Die Wear ◽  
Geometry Design ◽  
Induced Stress ◽  
Thread Rolling

AbstractIn this paper, a numerical analysis of the cold thread-rolling process using flat dies is presented as a function of the die geometry design. Five die geometries with different threading and finishing ratios were modelled to induce different screw deformation rates. An analytical method was proposed by the authors to design die geometries as a function of screw roll rotation. Screw geometry accuracy, induced stress, and die wear were selected to compare the tested geometries. The results showed that three screw rotations in the threading step were sufficient to guarantee good geometry accuracy. Moreover, the results highlighted that die wear is the most affected parameter among all the tested geometries. Finally, a new solution was proposed by the authors to obtain uniform wear and reduce the die length.

3D Numerical Analysis the State of Elastic/Visco-Plastic Strain in the External Round Thread Rolled on Cold

2014 ◽  
Vol 474 ◽  
pp. 436-441 ◽  
Author(s):  
Krzysztof Kukielka ◽  
Leon Kukielka ◽  
Łukasz Bohdal ◽  
Agnieszka Kułakowska ◽  
Leszek Malag ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Rolling Process ◽  
Nonlinear Phenomena ◽  
Explicit Integration ◽  
Initial Yield Stress ◽  
Discrete Equations ◽  
Hardening Modulus ◽  
Thread Rolling ◽  
Incremental Step

This work describes the thread rolling as a real object and its physical and mathematical modelling. An incremental modelling and numerical solution of the contact problem between movable elastic or rigid tool and elastic/visco-plastic bodies developed in [ is adopted to the numerical simulation of thread rolling process for the case of rigid tool (threading head) and elastic/visco-plastic body (pipe or bar). An update Lagrangian formulation was used to describe nonlinear phenomena on a typical incremental step. For solution of discrete equations of motions and deformations of the object the explicit integration method was applied. The algorithm and application of 3D numerical analysis in ANSYS program were elaborated. This algorithm let for determination of influence of friction coefficient, initial yield stress and plastic hardening modulus. This factors influence will be carried out with 5 levels rotary experiment plan, which let for elaboration of regression equation to describe this relationship. Exemplary results of 3D numerical analysis of displacement and strain in thread for different conditions of rolling process are presented.

Modeling and numerical analysis of the thread rolling process

PAMM ◽  
2006 ◽  
Vol 6 (1) ◽  
pp. 745-746 ◽  
Author(s):  
Krzysztof Kukielka ◽  
Leon Kukielka
Keyword(s):  
Numerical Analysis ◽  
Rolling Process ◽  
Thread Rolling

scholarly journals The Influence of the Asymmetric Arb Process on the Properties of Al-Mg-Al Multi-Layer Sheets / Wpływ Asymetrii W Procesie Arb Na Właściwości Wielowarstwowych Blach Al-Mg-Al

2015 ◽  
Vol 60 (4) ◽  
pp. 2821-2826 ◽  
Author(s):  
A. Wierzba ◽  
S. Mróz ◽  
P. Szota ◽  
A. Stefanik ◽  
R. Mola
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Tensile Strength ◽  
Rolling Process ◽  
Asymmetry Factor ◽  
Relative Reduction ◽  
Test Results ◽  
Initial Thickness ◽  
Asymmetric Rolling ◽  
Aluminium Layer

The paper presents the results of the experimental study of the three-layer Al-Mg-Al sheets rolling process by the ARB method. The tests carried out were limited to single-pass symmetric and asymmetric rolling processes. An Al-Mg-Al package with an initial thickness of 4 mm (1-2-1 mm) was subjected to the process of rolling with a relative reduction of 50%. To activate the shear band in the strip being deformed, an asymmetry factor of av=2 was applied. From the test results, an increase in the tensile strength of the multi-layer Al-Mg-Al sheets obtained from the asymmetric process was observed. Microhardness tests did not show any significant differences in aluminium layer between respective layers of sheets obtained from the symmetric and the asymmetric process. By contrast, for the magnesium layer, an increase in microhardness from 72 HV to 79 HV could be observed for the asymmetric rolling. The analysis of the produced Al-Mg-Al sheets shows that the good bond between individual layers and grain refinement in the magnesium layer contributed to the obtaining of higher mechanical properties in the multi-layer sheets produced in the asymmetric process compared to the sheets obtained from the symmetric process.

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