hot strip mill roll change

Quick RollChanging in Steel Strip Production

The possibility of quick rollchanging reduces repair times, increases yield of the mill and boosts flexibility of changing between different products As a consequence, it becomes easier for the producers of hot strips to reply to changing customer

Hot Strip Mill (HSM) process animation | Primetals

29042016· Hot Strip Mill (HSM) process animation | Primetals Technologies Hot Strip Mill (HSM) process animation | Primetals Technologies Watch later Share Copy link Info Shopping Tap to

作者: ENOVA Engineering

A SURVEY OF THE LOOPERTENSION CONTROL TECHNOLOGY IN

change caused by roll gap movement Another disturbance comes from the set–up mismatch Before the strip arrives at the finishing mill, a supervisorycomputer calculates initial set– up values such as the roll gap and rolling speed for the stands to get required specifications However, the mismatch between the real processed values

Rolling (metalworking) Wikipedia

Slabs are the feed material for hot strip mills or plate mills and blooms are rolled to billets in a billet mill or large sections in a structural mill The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators Billets, for rerolling, are subsequently rolled in either a merchant, bar or rod mill Merchant or bar mills produce a variety of shaped products such

Hot Rolling an overview | ScienceDirect Topics

During hot rolling the microstructure and mechanical properties of the material change with its thermomechanical state, determined by composition, percent reduction, strip thickness, strip speed, and heat transfer For steels, hot rolling is generally conducted at 850–1200 °C, in the austenite phase, while for aluminum it is conducted at 350–500 °C During each rolling pass, strain is imparted to the

Upgrading of Hot Finishing Mill to 4Stands, and

A program to upgrade the hot finishing mill at the Fukui Works involving expansion to 4 stands and introduction of a new computer control system went into service in March 1997 The result has been increased hot rolling capacity and improved yield, together with significant improvements in thickness accuracy as well as in the properties of the

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A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING

changes in rolling conditions After a roll change or a mill stop rolls need some time to return to stable thermal conditions, every new bar entering the mill creates an impact, and sometimes there are really severe rolling accidents, due to faults by operators, weak rolled materials with

03 rolling of metals SlideShare

26082014· Example for hot strip mill process wwwnzsteelconz Oxidation scale is removed Mill reverses after each pass (5 or 7) and the roll gap is reduced each time Slabs are organised according to rolling schedule Red hot slab 210 mm thick is ready for rolling Slab is reduced to a long strip approx 25 mm thick The strip is coiled and uncoiled to make the tail end lead Leading edge and tail The strip

(PDF) Characteristics of Rolling Mills with Roll Shifting

The basic mechanism of roll shifting consists of changing the roll contact surfaces to redirect the force flow Strip crown with an without work roll shifting and bending are calculated from a

Upgrading of Hot Finishing Mill to 4Stands, and

trol system for the hot strip rolling mill It was transitional, having been completed with the renovation of the control system for the rougher in March, 1998 221 Control System The control system comprises a digital controller capable of highspeed, highvolume calculations, an operator guidance device operated by touch panels, and an FDDII compatible control system dataway with a data

(PDF) Characteristics of Rolling Mills with Roll Shifting

The basic mechanism of roll shifting consists of changing the roll contact surfaces to redirect the force flow Strip crown with an without work roll shifting and bending are calculated from a

A SURVEY OF THE LOOPERTENSION CONTROL TECHNOLOGY IN HOT

change caused by roll gap movement Another disturbance comes from the set–up mismatch Before the strip arrives at the finishing mill, a supervisorycomputer calculates initial set– up values such as the roll gap and rolling speed for the stands to get required specifications However, the mismatch between the real processed values

Rolling (metalworking) Wikipedia

Slabs are the feed material for hot strip mills or plate mills and blooms are rolled to billets in a billet mill or large sections in a structural mill The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators Billets, for rerolling, are subsequently rolled in either a merchant, bar or rod mill Merchant or bar mills produce a variety of shaped products such

Hot Rolling an overview | ScienceDirect Topics

Hot rolling processes are considered an important route for manufacturing of semifinished and final products such as plates, strips, and rods The first stage of this process consists of heating the material in the hot deformation region to increase material workability and reduce the flow stress of deforming metal

03 rolling of metals SlideShare

26082014· Example for hot strip mill process wwwnzsteelconz Oxidation scale is removed Mill reverses after each pass (5 or 7) and the roll gap is reduced each time Slabs are organised according to rolling schedule Red hot slab 210 mm thick is ready for rolling Slab is reduced to a long strip approx 25 mm thick The strip is coiled and uncoiled to make the tail end lead Leading edge and tail The strip is progressively reduced end are removed to the required thicknesses Strip

Control of Strip Tension in a Rolling Mill Based on

In the metals industry, tandem hot strip rolling mills are used for rolling out thick semi nished products, eg, slabs, to thinner at products The product, which is often referred to as strip, is clamped in each mill stand of the rolling mill train (cf Fig 1) As longitudinal tensile stresses in the strip have a signi cant in uence on the

Hot Strip Mill Rolls|Nippon Steel Rolls Corpoaration

stricter acceptance criteria of rolled product, the technical innovations of work rolls in Hot Strip Mills have been focused on the application and the improvement of HSS (High Speed Steel) rolls NSR has taken the initiative in the development of HSS materials and are proud that we are the world’s leading manufacturer of HSS work rolls

Strip mill Wikipedia

The strip mill was a major innovation in steelmaking, with the first being erected at Ashland, Kentucky in 1923 This provided a continuous process, cutting out the need to pass the plates over the rolls and to double them, as in a pack millAt the end the strip was cut with a guillotine shear or rolled into a coil Early (hot rolling) strip mills did not produce strip suitable for tinplate

A Study on the Characteristics of Oxide Scale while Hot

significant parameters Hot rolling experiments were carried out on a HILLE100 experimental rolling mill Five lubricating modes were used in the rolling tests to examine the deformation behavior of the oxide scale layer and changes to its surface roughness, these included dry rolling and water, oil/water emulsions and pure oil The effects of the original ground sample surface roughness in

Roll Mark/Bruise from Hot Strip Mill Mainline Metals

It is also known as hot mill tail end whip marks, dents, or pits This defect can be caused when a tailend of a previous coil has variable shape, and passes through the last hot mill finishing stand The sheet can whip/hit into the roll surface and mark it As a result, the following coil produced through the hot strip mill will have these bruises on the head end If the marks on the work

Improvement of the work roll performance on the 2050

Improvement of the work roll performance on the 2050 mm hot strip mill at Iscor Vanderbijlpark Volume 98 Issue 3 G Walmag, R J Skoczynski, J P Breyer

Analysis of roll stack deflection in a hot strip mill

In the hot strip mill under study, the slabs from the slab caster are rolled into strips by reducing their thickness from 210 mm to a value ranging from 16 mm to 12 mm, with the width of the strip ranging from 860 to 1540 mm The slabs are heated and soaked in a Walking Beam typereheating furnace up to a temperature of almost 1250ºC At fourhigh reversing roughing stand, the heated slabs are reduced to

(PDF) Designing of Hot Strip Rolling Mill Control System

Aimed at the complex demand of hot strip rolling mill in practicing, the configuration of the coiler and the technological process is analyzed The arithmetic of coiling tension and the control process is introduced The frame of the tension

03 rolling of metals SlideShare

26082014· Example for hot strip mill process wwwnzsteelconz Oxidation scale is removed Mill reverses after each pass (5 or 7) and the roll gap is reduced each time Slabs are organised according to rolling schedule Red hot slab 210 mm thick is ready for rolling Slab is reduced to a long strip approx 25 mm thick The strip is coiled and uncoiled to make the tail end lead Leading edge and tail The strip is progressively reduced end are removed to the required thicknesses Strip

Roughing Mill an overview | ScienceDirect Topics

Hot rolling is a process in a steel plant in which the semifinished slab is reheated to a predetermined temperature and the hot slab is rolled to make the specified hot strip in a coiled form The role of a hot strip mill (HSM) is to produce strips from semifinished steel slabs The resulting attributes of the rolled strip are its surface quality, thickness, width, flatness, and strip profile The sequential steps in an HSM are to reheat the semifinished steel slabs to the rolling

Hot & Cold Working and the Rolling Process

Endless Hot Strip Rolling Process In conventional hot strip production, slabs of thickness of about 250mm are heated in a furnace and are reduced to 30 to 60mm in thickness after passing through the roughing mill, and then further reducing it to within a range of 08 to 254mm by rolling in the finishing mill When the head and tail ends of the strip are finishrolled, both ends run out to

The use and performance of high speed steel rolls at

The use of high speed steel (HSS) rolls at Inland's 80 inch hot strip mill to reduce roll change delays has been very successful in helping the mill meet its initial production targets The HSS rolls have made a good start in replacing high chrome iron rolls in early finishing mill stands However, work must continue to improve HSS roll toughness, so that the rolls can be used in middle and

Hot Strip Mill Rolls|Nippon Steel Rolls Corpoaration

stricter acceptance criteria of rolled product, the technical innovations of work rolls in Hot Strip Mills have been focused on the application and the improvement of HSS (High Speed Steel) rolls NSR has taken the initiative in the development of HSS materials and are proud that we are the world’s leading manufacturer of HSS work rolls

Ch 13 uohedusa

Changes in the grain structure of cast or of largegrain wrought metals during hot rolling Hot rolling is an effective way to reduce grain size in metals for improved strength and ductility Cast structures of ingots or continuous castings are converted to a wrought structure by hot working Flat Rolling Practice