pass schedule theory of hot tmt mill

pass schedule theory of hot tmt mill

Rolling | Rolling (Metalworking) | Metalworking

Theory of Rolling. Rolling is a metallurgical process used to shape the metal to desired shape. - Here in VSP the application is for Hot Rolling of Steel only. - Rolling is very important process among the various methods as 90% of the metal products used are Rolled products only. Theory of Rolling - Hot Rolling of metal involves heating of the metal above the recrystallization temperature and ...

Roll pass design in continuous bar mills - SlideShare

May 18, 2015· Roll pass design in continuous bar mills 1. African Foundries Ltd. Lagos, Nigeria Presented by Rahul Kishore 2. Basics of Rolling A rolling mill consist of several, at least two rolls cylindrical or nearly cylindrical bodies which are termed as "roll" and which rest in bearings at their ends. The normal and average center distance from the center of one roll to the center of o

Pipe Manufacturing Process / Methods for Seamless & Welded ...

Mannesmann Plug Mill Pipe Manufacturing Process. Mannesmann was a German engineer who has invented this pipe manufacturing process. The only difference between the Plug mill process and the Mandrel mill process is that in the mandrel method inside diameter is achieved in a single pass whereas in Mannesmann multi-stage reduction is possible.

Study on hot rolling process of the D51 large-diameter ...

Apr 18, 2018· The objective of this study is to design a hot rolling process for manufacturing large-diameter threaded bars. Threaded bars in which longitudinal ribs are eliminated and transverse ribs play a role as a screw thread can be used as rebars. To design the hot rolling process for the D51 threaded bar, the mean reduction and rolling pass numbers were determined.

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ROLLING - Rajagiri School of Engineering & Technology

rolled to a thickness of 20 mm in one pass. The roll radius is 300 mm, and the rolls rotate at 100 rpm. Calculate the roll force and the power required. For annealed copper, it has a true stress of about 80 Mpa in the unstrained condition and at a true strain of 0.223, true stress is 280 Mpa.

Adaptation of hot mill process models - ScienceDirect

Jun 15, 1996· Fig. 1 shows the elements in a system associated with a single stand reversing mill used to roll thick, hot slabs of aluminium. Based on data describing the initial and desired fmal state of the workpiece a pass schedule is generated. This is done using either a 'look-up' table or a schedule generation algorithm.

Development of Pass Schedule Calculation ... - Scientific.Net

In this paper, pass schedule calculation method for single-stand reversing cold rolling mill is introduced. Newton-Rapshon method is used to solve non-linear equations composed of each pass loads according to equal power rolling strategy. After the thickness of each pass is calculated, rolling parameters of each pass is obtained by modification.

theory of hot rolling mill tmt bar

» pass schedule theory of hot tmt mill » traylor jaw crusher safety toggle block … of rolling mills, hot rolling mill,tmt bar,steel rolling … » More detailed rolling mills, tmt …

Rolling of Metals: Process and Principles (With Diagram)

Rolling is done both hot and cold. It is accomplishes in rolling mills. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Rollers may be plain or grooved depends upon the shape of rolled product.

Rolling (metalworking)

Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. After the grains deform during processing, they recrystallize, which maintains an equiaxed microstructure and prevents the metal from work hardening. The starting material is usually large pieces of metal, like semi-finished casting products, such as slabs, blooms, and billets.

Rolling mill speed calculation formula pdf

mill. Example:Calculate the rolling load if steel sheet is hot rolled 30 from.Even faster speed will result in the media centrifuging inside the mill and virtually no milling or movement of media. Calculating Jar and Jar Rolling Mill Speedthe design of rolling mills, it is necessary for a theory…

Behaviour of Surface Defects in Wire Rod Rolling

Oct 04, 2020· Samples are collected after pass 4, 6, 8, 14, 19 and the final pass, 28, representing the finished 5.5mm wire. By inspecting the cross sections, the rotation of the billets from pass to pass is ...

Practical Roll Pass Design | IOM3

Simon Wright - SJW Mill Consulting Ltd. Simon has spent 25 years working in the field of hot rolling of sections, rails and sheet piles. In 2006 he was central to the Scunthorpe long rail rolling project with the development of the new Roll Pass Design for a seven stand continuous finishing mill.

Application of Fuzzy Set Theory in the Scheduling of a ...

The fuzzy set theory is applied to find out an optimum drafting pattern. The methodology is illustrated by means of a few examples. It is observed that the schedule in which the maximum reduction is achieved in the first pass results in minimum specific power; however, its reliability is poor.

Roll Pass Designing in Continuous Bar Mills - SlideShare

Jul 29, 2010· Roll Pass Designing in Continuous Bar Mill Billet Size Area Finished Size Area of finished bar Co-efficient of elongation No. of passes 150 22500 12 113.1429 198.8636 20.78453 150 22500 16 201.1429 111.8608 18.52503 150 22500 20 314.2857 71.59091 16.77243 150 22500 22 380.2857 59.16604 16.02385 150 22500 25 491.0714 45.81818 15.01982 150 22500 ...

Maintenance for productivity Rolling models

1) A pass is one deformation step consisting of the different phases threading, rolling at constant speed, deceleration and tailout of the strip through the mill. A pass schedule is a series of values for the pass, such as thickness, speeds and forces presets.

Introduction to Seamless Pipe Manufacturing - The Process ...

Jul 24, 2018· It is then made into a pipe by stretching the hot steel billet out into a seamless pipe or forcing the edges of flat steel strip together and sealing them with a weld. In this article we will discuss the various methods involved in seamless pipe manufacturing. Mandrel Mill Process. In the Mandrel Mill Process, a solid round steel billet is used ...


simulation" to give my theory of fire-cracks more background. Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003

A Flatness Based Approach for the Thickness Control in ...

rolling mill is operating around a predefined pass schedule. But if the operating point is changing in a wider range, like it is the case for a flying gauge change in continuous rolling mills, then the non-linearities of the mathematical model can no longer be neglected. At this point it is worth mention-

Hot Strip Mill - an overview | ScienceDirect Topics

G. Engberg, L. Karlsson, in Fundamentals of Metallurgy, 2005. 11.5.1 Hot rolling. Mill data from the hot strip mill has been used to calculate the mean flow stress in each pass, assuming the material to be elastic – ideally plastic. The roll force model used was a classical slab method with constant friction assumed in the roll gap.


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Effect of pass schedule and groove design on the metal ...

Sadhan¯ a¯ Vol. 41, No. 1, January 2016, pp. 111–124 c Indian Academy of Sciences Effect of pass schedule and groove design on the metal deformation of 38MnVS6 in the initial passes of hot rolling R S NALAWADE∗, V R MARJE, G BALACHANDRAN and V BALASUBRAMANIAN Kalyani Carpenter Special Steel Pvt. Ltd., Mundhwa, Pune 411036, India

ERP Software for Coils Industry

Real time production recording of all production process like HR Slitting, Pickling, Cold Rolling, Annealing, Skin Pass,CR slitting, Cut To length. Coil stock aging; It handles conversion factors between steel coils (Kg or Ton). PO Change History; Multiple order items from one or more customers can be grouped on single job.

Slit rolling - Danieli Centro Recycling ‹ Danieli USA

mill is required. Pass Design The leader sections for the multiple slit rolling pro-cess, e.g. square, rectangular or round have to be of very close tolerance. This requires: * Correct pass profile in the rolls * Correct roll gap to ensure no overfill * Correct pass alignment between top and bottom rolls * Sound roll neck bearings and positive roll


9 17 Rolling Mills Equipment is massive and expensive Rolling mill configurations: – Two-high: two opposing rolls – Three-high: work passes through rolls in both directions – Four-high: backing rolls support smaller work rolls – Cluster mill: multiple backing rolls on smaller rolls – Tandem rolling mill: sequence of two-high mills 18 Various configurations of rolling mills: (a) 2 ...

Bearings for Steel Industry - NSK Ltd.

A complete product line for all steel mill processes delivers improved productivity and lowered maintenance costs, with long life and highly reliable bearings. Bearings for iron and steel works operate under a variety of harsh conditions, including high temperatures, high speed or super low

pass schedule theory of hot tmt mill

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Roll pass design - Definitions - SlideShare

Jan 08, 2014· The curves graph power against elongation. The units of power are horsepower ( HP ) per ton per hour or HP hour / ton. The x-axis is elongation. To develop a power curve for rounds, we know the area of the bar as it progresses from the mill, from either the pass schedule, mill …



The Hot Rolling Process - California Steel Industries

The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.

Hot Sheet and Plate Rolling Fundamentals – Practical ...

Hot Sheet and Plate Rolling Fundamentals — Practical Training Seminar. About the Program. This seminar provides a comprehensive overview of hot rolling steel strip and plate. The course covers fundamentals, metallurgical and quality requirements, equipment, rolling theory, control, rolls, temperature control, measurement, safety and new ...

by Umut Hanoglu Supervised by Prof. Božidar Šarler

THE HOT ROLLING PROCESS Reheating Furnaces Heated up to 1200 –1250 C for steel, 500 –550 C for aluminum Removing cast dendrite structures Dissolving most of alloying elements Decreases hard precipitates Roughing mill Coil box Finishing mill Figure is from John G. Lenard, (2007)