The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold ...
casted steel slabs and rolled in two stands down to desired thickness. The first stand is a conventional roughing mill. The last stand is a steckel mill. It is a special rolling technique that is only used in a small number of hot strip mills in the world. When this special technique is used, the demand on the control is …
The empirical research took place at a hot strip mill. As a result, the 3D ground non-circular geometry of the backup rolls considerably reduced the rolling force variation. Key words: non-circular grinding, rolling mill, backup roll, rolling force variation. 1. INTRODUCTION Contemporary steel mills are operating on a global market and the ...
Hot rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape. Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. Hot rolled products are frequently categorized
A two-stand reversing cold mill can deliver capacities between 300,000 t/a of thin-gauge products or 1,000,000 t/a and more of thicker-gauge products. Main benefits of Primetals Technologies' reversing cold mills. High production capacity and yield. Flexible, low-cost rolling of a wide range of products, especially for small order lots.
Because the dimensions of existing hot-rolled T-bars are unsuitable, T-bars fabricated by welding two plates are cur- rently used in shipbuilding. To manufacture slim T-bars by hot rolling, we devised a new T-bar rolling process using two universal mills and an edging mill. The two universal mills have different roll …
Jun 01, 2007· Mill modulus control (MMC) is one of important methods in AGC system for strip rolling mills. Control theories and models related to MMC were studied deeply in this paper. Its ability to eliminate strip thickness deviation, rolling force noise and roller eccentricity disturbances were simulated respectively based on different virtual mill ...
Oct 04, 2019· A Cold Rolling Mill rolls, in subsequent short passes(due to the relative thick material), coiled strip from a thickness of up to 8 mm (coming from Hot Rolling Mill) down to 0.2 mm; the mill is designed with high rolling force and power capability and …
What you can expect from our hot rolling mills are high productivity and cost-effectiveness. Depending on your final products and production volume, we develop custom solutions - wherever you are in the world. These range from complete new plants to modernizations and service schemes for existing equipment. As a system supplier, we offer you ...
hot-rolled coils, thereby effecting pass cutting in the cold-rolling process. 3) To realize a high-productivity hot-rolling mill by replac-ing the computer control system with one of the latest design that achieved a significant degree of automa-tion. The expansion of the hot finisher to 4 stands, which was
The invention relates to the control of rolling mill backup roll eccentricity by combining the load carrying characteristics of rolling mill tapered roller bearing assemblies during rolling with prescribed levels of axial thrust to effect a controlled deflection of backup roll necks on a 4-high rolling mill or the like due to the selected thrust force applied axially to the ends or necks of ...
The invention relates to a Steckel hot rolling mill comprising at least one reversing roll stand ( 1 ) as well as coilers ( 6,7 ) which are positioned upstream and downstream and present torque-controlled drives. The aim of the invention is to improve such a hot rolling mill in such a way that it optimally counteracts variations in tension and/or mass flow caused by changes in process ...
abnormal rolling condition. Thus, the specifications of dimensional quality and mass flow in hot rolling mills can be satisfied by proper control of the strip tension and looper angle. Figure 1 shows the tension and looper control in a typical finishing mill. Traditionally, looper angle control has been per-
Jun 15, 1996· The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.
find both eccentricity magnitude and eccentricity location in the roll as shown in Fig.10. But, as shown in Fig.12, not only magnitude of eccentricity but also location of eccentricity in the roll is obtained. 4.2 Simulations with Field Data Fig.13 shows a simplified multi-stand hot rolling system. The rolling system consists of seven stands.
This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills. Roll-eccentricity-induced disturbances can result in strip thickness deviation and ...
Dec 22, 2013· Fig 2 work roll bending and continuous varying crown. Roll eccentricity compensation – Roll eccentricity is a periodic disturbance caused by a structure of back up rolls in rolling mills, and it affects product thickness accuracy. It cannot be measured directly by sensors, so it should be identified by measured thickness or measured roll force.
Online Eccentricity Monitoring of Seamless Tubes in Cross-Roll Piercing Mill Wall-thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot
An on-line monitoring system has been developed to detect roll anomaly in a hot strip mill. The system calculates the roll eccentricity value for each roll and alerts the operators of a risk of roll spall when the value is largely changed. The presentation will show the …
An encoderless roll eccentricity compensation system for rolling mills and sheet casters; Shop floor inventory and production tracking systems for hot rolled plate and coiled products and for sheet finishing operations; A standard hydraulic mill stand control product for rolling mills
Hot rolling begins with heating the billet or blooms to a high temperature of around 1100 degrees Celsius. The temperature is of particular importance. Hot rolling and hot extruding drawing involves working above the recrystallization point of the steel. The mill passes the heated material through a variable number of stands.
INTRODUCTIONG IVEN A SET OF thickness defects measured in a rolled strip at the exit of a finishing hot strip mill (FHSM), the problem is to diagnose the following: 1) whether defects come from roll eccentricity; 2) for a defect caused by roll eccentricity, which roll or rolls produced it.
Roll eccentricity compensation (Class 700/156) Hot rolling method. ... of a hot rolling process of a semi-finished metal product in at least one rolling mill stand having at least two work rolls is provided. The regulation method includes calculating a forward slip ratio (FWS) with the following equation: FWS = | v exit - v stand | v stand ...
Dec 03, 2015· The rolling speed is set to allow the last stand to perform the final reduction at the finishing temperature, between 820 deg C to 900 deg C, so as to achieve certain mechanical properties in the hot rolled strip. The finishing mills roll the transfer bar in tandem, meaning each bar is rolled through all the finishing stands at once.
Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. Hot rolled products are frequently categorized into plain carbon, alloy, high strength alloy, dual phase, electrical and stainless steels.
Nov 12, 2013· In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is ...
In this study, a new diagnosis method for roll eccentricity under the roll speed changes was developed. The new method was induced from analyzing the rolling mechanism by using rolling force models, radius-speed relationship, and measured rolling force, etc. Simulation results by using the field data show that the proposed method is very useful.
Jul 01, 1987· Awtm/ia Abstract: An in-depth review of the roll eccentricity control design problem is provided which encompasses a number of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations. A unifying approach to eccentricity control ~nables the diverse range of published ...