scholarly journals Theoretical study of the process of balls rolling with a diameter of 40 mm on a ball rolling mill

2021 ◽  
Vol 1178 (1) ◽  
pp. 012040
Author(s):  
A Naizabekov ◽  
B Mukhametkaliyev ◽  
S Lezhnev ◽  
E Panin
Keyword(s):  
Rolling Mill ◽  
Theoretical Study ◽  
Ball Rolling

scholarly journals IMPROVING DYNAMIC REGIME OF ROLLING FOR INCREASING DURABILITY OF BALL-ROLLING MILL ROLLS

2019 ◽  
Vol 61 (12) ◽  
pp. 927-932 ◽  
Author(s):  
V. Yu. Rubtsov ◽  
O. I. Shevchenko ◽  
M. V. Mironova
Keyword(s):  
Contact Pressure ◽  
Rotational Speed ◽  
Rolling Mill ◽  
Experimental Studies ◽  
Rolling Process ◽  
Operating Conditions ◽  
Frequency Method ◽  
Rolling Mills ◽  
Ball Rolling ◽  
Progressive Technology

One  of  the  important  reasons  for  the  downtime  of  ball  rolling  mills  is  replacement  of  rolls  due  to  their  wear  and  tear.  The  degree  and  zones  of  critical  wear  of  ball  rolling  rolls  are  investigated  in  the  article, where the greatest wear is observed over the flanges in zone of billet  capture.  Conditions  necessary  to  capture  the  blank  and  to  perform  rolling  process  are  analytically  determined.  Variable  frequency  method  of  roll  rotations  is  proposed  as  a  progressive  technology  for  blank supply. The results of tests for its variations in accordance with  linear  and  quadratic  law  are  presented.  Known  formulas  determining  average  strain  rate  at  rolls  rotational  speed  change  are  converted  for  linear and quadratic dependences. Experimental studies have been carried  out  in  conditions  of  EVRAZ  Nizhnetagilsky  Metallurgical  Plant  ball rolling mills during rolling of 60mm ball made of Sh-3G steel. Experiments  were  performed  for  given  parameters  of  manual  change  in  rolls rotation speed at blank capture by rollers. The results have shown  a  significant  effect  of  change  in  rotational  speed  on  average  specific  pressure during blank capture. Evaluation of torque-time and average  contact  pressure  for  calculated  and  experimental  data  are  presented.  Empirical characteristics are also described at variable rotational speed  of rolls according to linear and quadratic law. Acceptable convergence  of results of calculated and empirical characteristics is determined. Engineering solution has been proposed for that task. It consists in installation of a thyristor converter. This solution allows reduction of rolls  speed before blank capture. Also, this solution will increase frequency  to  the  nominal  value  according  to  the  given  law  after  blank  capture.  As an obtained result, there is uniform distribution of average contact  pressure over the entire length of the roll under different operating conditions  of  mill  in  automatic  mode. Application  of  this  technique  will  reduce wear degree of the rolling tool. At the same time, productivity  of ball rolling mill will be maintained. Rolls consumption and number  of rolls change will decrease due to rolls wear.

Wire Flattening Using a Ball Rolling Mill

2012 ◽  
Vol 83 (12) ◽  
pp. 1180-1185
Author(s):  
Joanna Przondziono ◽  
Jan Szymszal
Keyword(s):  
Rolling Mill ◽  
Ball Rolling

The new ball-rolling mill of EVRAZ NTMK – new possibilities for customers

2020 ◽  
Vol 76 (6) ◽  
pp. 602-608
Author(s):  
К. А. Ulegin ◽  
K. N. Shvedov ◽  
А. N. Borodin ◽  
V. Yu. Rubtsov
Keyword(s):  
Rolling Mill ◽  
Investment Project ◽  
Production Quality ◽  
Automation System ◽  
Technological Parameters ◽  
Efficient Operation ◽  
Grinding Balls ◽  
Ball Rolling ◽  
Production Section ◽  
On Line

In view of increase of ferrous and nonferrous ores mining, the need for grinding balls, used for the ores grinding in the process of concentration, is also increasing. Description of technical solutions, realized at accomplishment of an investment project at JSC EVRAZ NTMK, presented. The investment project on the technical modification of the rail and beam shop included construction of the new ball-rolling mil further to production of steel grinding balls. The new ball-rolling mill, which was put into operation in 2018, has a possibility to produce ball of diameter from 60 up to 120 mm with hardness up to 5th group. The mill is equipped by an automation system of the process and balls stocking control. The ball production section comprises a walking beams heating furnace with automated heating modes to ensure energy-efficient operation; automated hot rolling mill for production grinding balls of 60 ‒ 120 mm diameter; balls thermal treatment line, including temperature leveling facility, quenching machine and tempering furnace. The system of the process automation enables to trace on-line all the technological parameters for production quality products, parameters of the environment to increase the energy efficiency of the section, and control system to create safety working area at the section. Within a year after the ball-rolling mill commissioning, the whole nomenclature series of balls was mastered and the passport productivity at each profile was reached. The maximum mill productivity obtained was 22 t/h. The JSC EVRAZ NTMK mill of grinding balls of 60 ‒ 120 mm diameter production meets all the modern market requirements.

Heat treatment of rollers in the ShPS 30-80 ball-rolling mill at JSC DMPZ

2015 ◽  
Vol 45 (10) ◽  
pp. 784-788
Author(s):  
M. M. Lam ◽  
A. I. Serov ◽  
A. A. Ternavskiy ◽  
G. S. Bazarova ◽  
Y. N. Smyrnov
Keyword(s):  
Heat Treatment ◽  
Rolling Mill ◽  
Ball Rolling

scholarly journals ROLL PASS DESIGN OF A BALL-ROLLING MILL. PART 2

2015 ◽  
Vol 56 (6) ◽  
pp. 16
Author(s):  
V. N. Peretyat’ko ◽  
A. S. Klimov ◽  
M. V. Filippova
Keyword(s):  
Rolling Mill ◽  
Roll Pass Design ◽  
Pass Design ◽  
Roll Pass ◽  
Ball Rolling

scholarly journals Calibration of ball-rolling rollers with continuously variable pitch

2018 ◽  
pp. 58-63 ◽  
Author(s):  
V. Yu. Rubtsov ◽  
O. I. Shevchenko
Keyword(s):  
Rolling Mill ◽  
Metal Cutting ◽  
Constant Width ◽  
3D Models ◽  
Roll Pass Design ◽  
Pass Design ◽  
Roll Pass ◽  
Reduction In Force ◽  
Ball Rolling ◽  
Cutting Equipment

Presented is the state of ball rolling production, review of existing techniques for roll pass design ball-rolling today development. Possibilities of roll pass design with regard to the existing metal cutting equipment and variation of pitch parameters.  The priority is set for the use of rolling rolls with a continuously varying pitch, in comparison with rolls with discretely varying pitch. Possibility of using 5-axis milling equipment for obtaining a given profile, with several variable values, is shown. Model is developed for calculating the roll pass design for rolls with a continuously varying pitch, the save constant amounts of metall of workpiece between the rolls in every moments. Pitch change functions for roll pass design of ball rolling with a constant and variable flange width are derived, using which it is possible to determine the theoretical pitch at any rolls rotation angle. Technique for constructing a 3-D model is developed, based use on obtained curve of the 2nd order, which is the basis helical surface with a continuously varying pitch. Production of profile on a 5-axis machining center, according to the the 3D models suggest. Roll pass design was used ob the experience practical, with production example ball with a diameter of 120 mm, which were calculated from the deduced function for rolls with a constant width of the flange. He was tested in the conditions of the newly introduced ball-rolling mill of JSC "EVRAZ-NTMK". After introduction of a new roll pass design, were resived technical results: the reduction in force rolling, in contrast at use operating rolls with discretely varying pitch, by 25–30%, obtaining ball sizes that are as close to nominal values GOST standard, decreased of defects, uniformity forge along entire length of the rolls forming-part obtaining.The analytical solutions presented in this article, in combination with industrial approbation, make it possible to use a new method roll pass design rolls of a ball rolling mill with a continuously changing pitch for educational and production purposes.

Steel Strips Flattening in Ball Rolling Mill

2010 ◽  
Vol 165 ◽  
pp. 153-158 ◽  
Author(s):  
Joanna Przondziono ◽  
Jan Szymszal
Keyword(s):  
Rolling Mill ◽  
Production Method ◽  
Efficient Production ◽  
Tension Stress ◽  
Technological Parameters ◽  
Flat Surfaces ◽  
Experimental Planning ◽  
Ball Rolling ◽  
Steel Strips ◽  
Ball Diameter

An effective and efficient production method of narrow and thin strips made of steel, non-ferrous metals and their alloys is wire flattening in a ball rolling mill. In this device cylindrical rollers have been replaced with balls of diameter ca. 15 mm. Proper selection of deformation process parameters enables to obtain strips with the required geometrical characteristics. Experimental planning method was applied to evaluate the influence of flattening process technological parameters on strip geometrical features. Statistical analysis enabled to determine mathematical models of stainless steel 5XCrNi18-10 strips flattening. It was established that strip widening depends on ball roughness, draft applied, relation of wire diameter to ball diameter, back-tension stress. Strips flatness depends on draft applied. It was observed that strips feature uniform thickness over their width, parallel flat surfaces, narrow dimensional tolerance, high quality surface and naturally rounded edges.

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