Prediction of Billet Fracture at Two-High Screw Rolling Piercing

Metallurgist ◽  
2021 ◽  
Vol 64 (9-10) ◽  
pp. 1020-1028
Author(s):  
Yu. V. Gamin ◽  
M. M. Skripalenko ◽  
B. A. Romantsev ◽  
M. V. Kadach
Keyword(s):  
Screw Rolling

Improved Screw Rolling Press

1884 ◽  
Vol 18 (445supp) ◽  
pp. 7097-7097
Keyword(s):  
Screw Rolling

scholarly journals Obtaining hollow semi-finished products from copper alloys for electrical applications by screw rolling method

2020 ◽  
pp. 27-38 ◽  
Author(s):  
Yu. V. Gamin ◽  
B. A. Romantsev ◽  
A. N. Pashkov ◽  
P. V. Patrin ◽  
I. A. Bystrov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Copper Alloys ◽  
Reduction Process ◽  
Point Of View ◽  
Wall Thickening ◽  
Relative Reduction ◽  
Outer Diameter ◽  
Screw Rolling ◽  
Front End ◽  
Rolling Method

The article proposes a process for obtaining semi-finished products in the form of pipes made of copper alloys for electrical applications using the screw rolling method. The paper presents the results of experimental piercing and rolling of pipe samples made of Cu–0.75Cr copper alloy billets with a diameter of 45 mm. The 43.5×10.0 mm samples obtained after piercing using a two-roll screw rolling mill had exact geometrical dimensions: outer diameter deviation at the front end was up to 1 %, at the back end – up to 2.4 %; relative variation in wall thickness at the front end was 0.3÷0.5 %, at the rear end – 0.5÷1.0 %. Then pierced pipe samples were rolled using a three-roll radial-shear rolling (RSR) mini mill with a different total degree of reduction – samples were obtained with an outer diameter of 30, 25 and 18 mm. The reduction process was analyzed from the point of view of internal hole stability and deformation. In case of 30 % relative reduction of the outer diameter, rolling without a mandrel is accompanied by wall thickening. In this case, inner diameter deviations are within acceptable limits. The experiments on obtaining samples from the Cu–0.75Cr alloy by screw piercing and reduction in the RSR mill show that this scheme can be implemented in principle in industry. At the same time it is necessary to define more exactly deformation parameters (degree of deformation, choice of reduction scheme) to obtain a quality product. Various options for heat treatment (HT) of the obtained pipe samples and the effect of the HT method on electrical conductivity and hardness are considered. Samples after piercing had a conductivity of 59.3 % IACS. The maximum electrical conductivity of 76.7 % IACS was obtained on samples after quenching from a temperature of 1020 °C and aging at 450 °C for 3 h. The results of the work show the fundamental possibility of obtaining semi-finished products from copper alloys for electrical purposes using the screw rolling method.

The dynamic recrystallization and mechanical property responses during hot screw rolling on pre-aged ZM61 magnesium alloys

2020 ◽  
Vol 798 ◽  
pp. 140126
Author(s):  
Lifei Wang ◽  
Zhengyong Zhang ◽  
Hua Zhang ◽  
Hongxia Wang ◽  
Kwang Seon Shin
Keyword(s):  
Mechanical Property ◽  
Dynamic Recrystallization ◽  
Magnesium Alloys ◽  
Screw Rolling

Optimization of Screw Rolling Ball Process Parameters Based on Orthogonal Test

2012 ◽  
Vol 201-202 ◽  
pp. 1190-1193 ◽  
Author(s):  
Xiao Zhong Ren ◽  
Yong Qing Liu ◽  
Yu Rong Jin
Keyword(s):  
Comparative Study ◽  
Process Parameters ◽  
Orthogonal Test ◽  
Rolling Temperature ◽  
Optimal Combination ◽  
Screw Rolling ◽  
Specific Measure ◽  
Rolling Ball ◽  
Related Process

The selection and optimization of screw rolling ball process parameters were analyzed and discussed. The inner stress of ball is the major factor that affects the ball quality during screw rolling of ball. The inner stress is apt to be affected by other related process parameters. In practical, there is no specific measure to determine the parameters. In view of this situation, the influences of roller obliquity, rolling temperature, speed of roller and the outlet distance between guide boards and other parameters on the inner stress of ball were analyzed respectively through orthogonal test. The optimal combination of parameters was found through comparative study on several parameter combinations.

scholarly journals Influence of cross-screw rolling modes on mechanical properties and fracture toughness of pipe steel

2021 ◽  
Vol 64 (1) ◽  
pp. 28-37
Author(s):  
N. S. Surikova ◽  
I. V. Vlasov ◽  
L. S. Derevyagina ◽  
A. I. Gordienko ◽  
N. A. Narkevich
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Pipe Steel ◽  
Screw Rolling

Deformation effect of the scale factor during screw rolling

2010 ◽  
Vol 2010 (10) ◽  
pp. 910-916 ◽  
Author(s):  
M. E. Getmanova ◽  
O. V. Livanova ◽  
A. N. Nikulin ◽  
G. A. Filippov
Keyword(s):  
Scale Factor ◽  
Screw Rolling ◽  
Deformation Effect

Obtaining Hollow Semifinished Products Based on Copper Alloys for Electrical Purposes by Means of Screw Rolling

2020 ◽  
Vol 61 (2) ◽  
pp. 162-171 ◽  
Author(s):  
Yu. V. Gamin ◽  
B. A. Romantsev ◽  
A. N. Pashkov ◽  
P. V. Patrin ◽  
I. A. Bystrov ◽  
...  
Keyword(s):  
Copper Alloys ◽  
Screw Rolling

scholarly journals Improvement of the technology of producing extended composite transition pieces of steel 20 — steel 08Kh18N10T made by the method of hot screw rolling in vacuum

2017 ◽  
Vol 2017 (12) ◽  
pp. 46-51
Author(s):  
B.V. Borts ◽  
◽  
I.M. Nekhlyudov ◽  
N.D. Rybalchenko ◽  
V.I. Sytin ◽  
...  
Keyword(s):  
Screw Rolling ◽  
Steel 08Kh18n10t ◽  
Steel 20
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