scholarly journals Effect of the Friction and Reduction Angle on the Accuracy of Cold Drawing Steel Tubes STL Model Based on FEM Analysis

2020 ◽  
Vol 28 (47) ◽  
pp. 32-39
Author(s):  
Ladislav Morovič ◽  
Michaela Kritikos ◽  
Róbert Sobota ◽  
Mária Kapustová ◽  
Ján Urminský ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Fem Analysis ◽  
Cold Drawing ◽  
Simulation Software ◽  
The Other ◽  
Outer Diameter ◽  
Steel Tubes ◽  
Minimal Impact ◽  
Seamless Steel Tubes ◽  
Seamless Steel

Abstract The object of the study was to create a computer model that resembles the process of cold drawing seamless steel tubes, and evaluate the influence of selected process parameters on selected final dimensions and tolerances of STL models of the tubes obtained from DEFORM simulation software. The STL models of tubes generated from the simulations were evaluated, and the effects of the reduction angle and the friction coefficient on the inner/outer diameter, inner/outer roundness and concentricity were subsequently found. It was proven that the inner and outer diameters are not influenced by different values of the friction coefficient at the same reduction angle. On the other hand, increasing value of the reduction angle affects decrease of the outer and inner diamaters after drawing. Furthermore, this experimental investigation vindicates that friction coefficient and reduction angle have the minimal impact on the inner/outer roundness and outer concentricity.

Using 2D/3D FEM Simulation to Determine Drawing Force in Cold Drawing of Steel Tubes with Straight Internal Rifling

2020 ◽  
Vol 304 ◽  
pp. 121-125
Author(s):  
Martin Necpal ◽  
Mária Kapustová ◽  
Maroš Martinkovič
Keyword(s):  
Fem Simulation ◽  
Cold Drawing ◽  
Drawing Force ◽  
Forming Process ◽  
3D Fem ◽  
Steel Tubes ◽  
Cold Forming ◽  
Cold Draw ◽  
Seamless Steel Tubes ◽  
Seamless Steel

The most comprehensive steel tube portfolio is used to produce all kinds of modern energy production and the corresponding auxiliary unit such as boilers and heat exchangers. Multi-rifled seamless steel tubes are distinguished by maximum pressure, heat resistance, strength and durability. Production of multi-rifled seamless steel tubes by cold draw process using multi-rifled mandrel is quite a new technology. Shape and dimension of the drawing tool depend on drawing tube reduction degree, i. e. on the original diameter of the initial tube and final diameter of the tube. The technology of drawing tubes is influenced by process parameters, dimensions of tools and cold forming process conditions. Optimization of the whole forming process naturally involve the FEM analyses and simulation. One of the most important information of the cold drawing process is the load stroke of the tools. The contribution is concerned at the usability of FEM simulation on an evaluation of cold draw forming process condition and prediction of load stroke of the forming tools. DEFORM 2D/3D FEM software is used to compare the result of the drawing force and to determine the appropriate methodology to set FEM simulation of cold forming.

Production Technology for Precision Seamless Steel Tubes from the Perspective of Microhardness Changes

2016 ◽  
Vol 716 ◽  
pp. 988-993
Author(s):  
Milan Mojžiš ◽  
Martin Ridzoň ◽  
Peter Bella ◽  
Maroš Martinkovič ◽  
Ľudovít Parilák
Keyword(s):  
Cold Drawing ◽  
Pearlitic Steel ◽  
Relaxation Mechanism ◽  
Point Of View ◽  
Intermediate Annealing ◽  
Steel Tubes ◽  
Physical Point ◽  
Dislocation Hardening ◽  
Seamless Steel Tubes ◽  
Seamless Steel

The production of precision seamless steel tubes in Železiarne Podbrezová is using hot rolled tubes with multiple cold drawing passes and intermediate annealing. It utilizes intensive plastic deformation during cold drawing, taking full advantage of the microstructural state from a physical point of view. In this paper, optimization of technological processes for cold drawn tubes made from ferritic-pearlitic steel has been elaborated. We use microstructural and substructural analysis, dislocation hardening theory and stress analysis. The subject of this article is the experiment with multiple drawing passes and intermediate annealing for production of precision steel tubes with dimensions of 31.8 x 2.6 mm. The drawing itself consists of 5 processes (also called „runs“) with 7 drawing passes in total. The results presented show strain hardening of the material after drawing along with relaxation mechanism during intermediate annealing. The possibility of utilizing the microhardness values on intensity assessment of these processes is investigated, too.

Manufacturing of Precision Seamless Steel Tubes Using Cold Drawing Technology: Simulation and Experiment

2015 ◽  
Vol 808 ◽  
pp. 80-85
Author(s):  
Martin Ridzoň ◽  
Pavol Buček ◽  
Martin Necpal ◽  
Ľudovít Parilák
Keyword(s):  
Cold Drawing ◽  
Intermediate Annealing ◽  
Steel Tubes ◽  
Tube Drawing ◽  
Precision Tube ◽  
Simulation And Experiment ◽  
Strength And Deformation ◽  
Deform 2D ◽  
Seamless Steel Tubes ◽  
Seamless Steel

This paper deals with precision seamless tube drawing process in Železiarne Podbrezová, considering a three-pass drawing technology without the intermediate annealing. The material chosen was the E235 steel grade, cold-drawn from the initial dimension of ∅ 70 x 6.3 mm to the final dimension of ∅ 44 x 3.0 mm. Strength and deformation analyses for each drawing pass were made, based on simulation results in numerical modelling software DEFORM 2D. The deformations calculated for all passes served as a guideline for further process optimization. Furthermore, the effect of a particular reduction on mechanical properties was investigated (yield pointRe, ultimate tensile strengthRm, ductilityA, and hardnessHV). The research shown here is a part of the Research Project No. 3-2014/ŽPVVC “TUMIFORM – Optimization of precision tube drawing technology considering dislocation theory, microstructure, and plasticity limit“, being solved at ŽP VVC s.r.o. in Podbrezová, Slovakia. This project deals with the optimization of tube drawing technology utilizing the multi-pass drawing approach. This approach allows for skipping the intermediate annealing between each two successive draws.

Possibilities of Stereological Analysis of Grain Boundary Orientation in Longitudinal Sections of Precision Cold Drawn Seamless Steel Tubes

2017 ◽  
Vol 891 ◽  
pp. 51-54
Author(s):  
Martin Ridzoň ◽  
Maroš Martinkovič ◽  
Milan Mojžiš ◽  
Ján Turňa ◽  
Lucia Domovcová ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Cold Drawing ◽  
Steel Tube ◽  
Relative Reduction ◽  
Steel Tubes ◽  
Tube Cross Section ◽  
Boundary Orientation ◽  
Seamless Steel Tubes ◽  
Selection Of ◽  
Seamless Steel

Cold drawing of steel tubes refers to a forming operation where a precision steel tube is being formed in a die while reducing tube cross-section, altering the wall thickness and making the final tube much longer than the original hollow. The forming itself takes several drawing passes (a.k.a. draws) depending on the final tube dimension requested. The selection of relative reduction for a particular tube diameter plays an important role because an excessive reduction during drawing causes stresses that induce substantial plastic deformation, eventually leading to cracking. In this paper we evaluate the effect of selected reductions on the longitudinal grain boundary orientation in cold drawn tubes, taking tube sample measurements and making necessary calculations of grain boundary orientation in selected planes.

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