Refinement of the dependences of the contact friction stresses in the deformation zone during cold rolling on the technological factors

2013 ◽  
Vol 2013 (7) ◽  
pp. 513-516
Author(s):  
E. A. Garber ◽  
I. V. Yagudin ◽  
A. I. Traino
Keyword(s):  
Cold Rolling ◽  
Deformation Zone ◽  
Contact Friction ◽  
Technological Factors

A Comparative Study of Structure Formation in Thermomechanically Treated Ti-Ni and Ti-Nb-(Zr, Ta) SMA

2012 ◽  
Vol 706-709 ◽  
pp. 1931-1936 ◽  
Author(s):  
Sergey Prokoshkin ◽  
Vladimir Brailovski ◽  
Karine Inaekyan ◽  
Andrey Korotitskiy ◽  
Sergey Dubinskiy ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Comparative Study ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Structure Formation ◽  
Thermomechanical Treatment ◽  
Functional Properties ◽  
Nanocrystalline Structure ◽  
Technological Factors

The processes of structure formation in Ti-Ni and in Ti-Nb-Zr, Ti-Nb-Ta shape memory alloys (SMA) under thermomechanical treatment (TMT) were studied. The TMT comprised cold rolling with true strains from e=0.25 to 2 and post-deformation annealing. Differences in these processes between two groups of alloys are considered. The main conclusions are as follows: nanostructures created by TMT are useful for radical improvement of the SMA functional properties, and an optimum nanostructure (nanocrystalline structure, nanosubgrained structure or theirmixture) should be selected by taking into account other structural and technological factors.

A simplified mathematical model for total temperature rise calculation in non-oriented silicon steel cold rolling deformation zone

2021 ◽  
Vol 119 (1) ◽  
pp. 104
Author(s):  
Guomin Han ◽  
Hongbo Li ◽  
Yujin Liu ◽  
Jie Zhang ◽  
Ning Kong ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Temperature Rise ◽  
Deformation Zone ◽  
Rolling Force ◽  
Silicon Steel ◽  
Initial Model ◽  
Contact Heat ◽  
Friction Heat ◽  
Total Temperature ◽  
Rolling Deformation

In tandem cold rolling, the control of the temperature of high-grade non-oriented silicon steel is a difficult problem for its large deformation resistance and the preheating procedure before rolling. And it is complicated to calculate the total temperature rise of rolling deformation zone due to the comprehensive influence of the plastic deformation heat, the friction heat and the contact heat loss. So, to precisely calculate the total temperature rise, firstly, based on the four classical cold rolling force formulas, the initial total temperature rise calculation models are established correspondingly by theoretically analyzing the temperature rise of deformation heat, the temperature rise of friction heat and the temperature drop of contact heat loss; then, the model based on the improved Lian rolling force formula is adopted, which leads to calculated best matching the measured temperature; finally, considering the complex formula calculation of the initial model, based on the influences of different rolling parameters on the total temperature rise, a simplified model for convenient calculation is proposed by the nonlinear regression analysis of the initial model calculation results and main rolling parameters, which is convenient for the actual application by the field technicians.

scholarly journals Stress state and power parameters during pulling workpieces through a special die with an inclined working surface

2021 ◽  
pp. 161-176
Author(s):  
Zhassulan Ashkeyev ◽  
Maksat Abishkenov ◽  
Serik Mashekov ◽  
Anna Kawałek
Keyword(s):  
Plastic Deformation ◽  
Stress State ◽  
Slip Line ◽  
Deformation Zone ◽  
Geometric Parameters ◽  
Contact Friction ◽  
Plastic Deformation Zone ◽  
Rigid Plastic ◽  
Shear Deformations ◽  
Working Surface

The study of the stress state and power parameters when pulling workpieces in a special die with an inclined working surface at various shapes of the plastic deformation zone and geometric parameters of the special die was conducted. The distinctive feature of the proposed special die and the metal treatment process in the working channel of this die was described. The theoretical provisions and assumptions from the fundamental theory of plasticity and metal forming were used. The influence of the intensity of shear deformations on the stress state and force at the angles of inclination of the working surface of the die within 45–20°, the value of the ratio of the diameter of the workpiece to the length of the inclined surface d/z=1.5–2.0 was investigated. The optimal d/z ratio was determined by the method to a rigid punch indenting a rigid-plastic half-space, as well as by the method of strain energy. The field of slip lines and hodographs of velocities for various shapes of the deformation zone and geometric parameters of a special die were constructed. Based on the constructed slip line fields and velocity hodographs, the mean stress and stress components at the nodal points of the slip line field with the compilation of the equilibrium equations for all forces applied to the plastic zone were calculated. The study of the influence of contact friction between the working surface of the die channel and the workpiece on the stress state and power parameters during pulling was carried out. It was revealed that the optimal ratio d/z=1.5 and the optimal angle of inclination of the working channel of the die α=20°. It was found that for these parameters in the zone of plastic deformation, mainly significant compressive stresses act, which favorably affect the obtaining of a homogeneous and refined microstructure, and also exclude the appearance of anisotropy due to the implementation of maximum shear deformations in the workpiece.

Products stress during breaking-down with thinning-out of the pipe stock element

2021 ◽  
Vol 2021 (12) ◽  
pp. 3-6
Author(s):  
Sergey Larin ◽  
Marina Larina
Keyword(s):  
Stress State ◽  
Deformation Zone ◽  
Maximum Stress ◽  
Contact Friction

Based on the data obtained during the simulation of breaking-down and thinning-out simultaneously of the pipe stock element, the stress state of pipe jackets in the deformation zone has been evaluated. The influence of the contact friction magnitude, the tool conicity and the degrees of deformation on the maximum stress values and their heterogeneity have been determined.

Strain and Friction Effect on the Stress-Strain State in the Deformation Zone during Cold Rolling of Thin Beryllium and Aluminum Foils

2019 ◽  
Vol 822 ◽  
pp. 716-724 ◽  
Author(s):  
Vasiliy V. Mishin ◽  
Ivan A. Shishov ◽  
Vladimir V. Paromov
Keyword(s):  
Friction Coefficient ◽  
Cold Rolling ◽  
Deformation Zone ◽  
Strain State ◽  
Hydrostatic Stress ◽  
Stress Triaxiality ◽  
Fracture Prevention ◽  
Stress Strain ◽  
Stress Strain State ◽  
Contact Arc

The effect of strain and the friction on the stress-strain state in the deformation zone during cold rolling of thin beryllium and aluminum foils was investigated in this work. Calculations showed that material hardening has a significant influence on the contact pressure distribution along the contact arc. Although it, the distributions of hydrostatic stress and stress triaxiality are favorable for fracture prevention both beryllium and aluminum except narrow regions near the entrance and the exit of deformation zone for all considered cases (strain up to 40%, friction coefficient in range 0.03 – 0.3). The most favorable stress state is observed during cold rolling with a high friction coefficient (rolling without lubrication).

Applicability of the laws of elasticity for the determination of the elastic-region length in the deformation zone during cold rolling

2008 ◽  
Vol 2008 (3) ◽  
pp. 205-209 ◽  
Author(s):  
E. A. Garber ◽  
D. L. Shalaevskii ◽  
I. A. Kozhevnikova ◽  
A. I. Traino
Keyword(s):  
Cold Rolling ◽  
Deformation Zone ◽  
Elastic Region ◽  
Region Length
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