Temperature monitoring and control are critical factors in Hot Rolling Mills to assure desired product properties, ensure quality product, improve line speed and process control. There are a number of interferences that can affect the steel infrared temperature sensor reading at every point along the hot rolling mill.
roll bite and in a typical Cold Tandem Mill, work roll temperatures normally fall in the range of 55oC 70oC with strip recoil temperatures and inter-stand strip temperature rarely exceeding 160 oC depending on product. Roll Bite temperatures in slower heavily drafted stands can peak in the region of 300oC, diminishing with the
Jul 03, 2006· The application of data mining (DM) on hot strip rolling was introduced to improve the prediction accuracy of a model for estimating coiling temperature on a run-out table. Due to nonlinear and time-variation characteristics of coiling temperature control, conventional methods with simple mathematical models and a coarse adaptation scheme are
Nov 27, 2015· The final dimensional quality of the rolled product is determined by the rolling stands within the finishing mill. The dimensional accuracy in the final product depends on many factors including the initial stock dimensions, roll pass sequence, temperature, microstructure, roll surface quality, roll and stand stiffness and the stock/roll friction condition.
By the late 1990s the HPGR became standard equipment for processing iron ores. Successful hard rock mining installations followed about a decade later and HPGR applications have been expanding into base and precious metals flowsheets around the globe ever since, as the technology continues to prove itself on more complex and harder ores.
Jul 20, 2013· Set the roll nip opening to 2 mm. Adjust and maintain roll temperature at 70 ± 5 degrees C. Add rubber into the mill nip and band, as a continuous sheet, onto the front roll. Using a hand knife, make two ¾-cuts from each side and allow the rubber to move through the nip quite a few times until a smooth rolling bank is formed on the nip.
As regards “abnormal” rolling conditions which are more or less very “normal” for rolling mills roll damage often occurs with consequences for the mill and the rolled product. Evidently the reasons of roll failure have to be discussed and determined (or vice versa) to reduce the risk of repeated roll
AdvantagesofAluminum Thepropertiesofaluminummakeitoneofthe mostadvantageousandversatilematerialsin usetoday.Aluminumis: Lightweight—Aluminumanditsalloys weigh
average temperature of the bar as it exits the last roughing mill normally ranges from 1900° to 2100° Fahrenheit. This data is collected in anticipation of fin ish rolling. Computers immediately begin calculating the speeds and gaps for threading the six finishing mills, which will roll the steel in tandem with one another.
Mill Behaviour of Rubber on Two Roll Mill with Temperature Hiroyuki Ontsuka1 and Michiharu Toh2 1Chemicals Evaluation and Research Institute (Inc.) Nagoya Establishment, 1-4-chome, Orito-cho, Showa-ku, Nagoya, Aichi 466-0858, Japan 2R&D Department Kurume Research Park Co., Ltd., 1-1 Hyakunen Kouen, Kurume, Fukuoka 839-0864, Japan
Roller Mill Maintenance Mark Heimann Roskamp Champion 2975 Airline Circle Waterloo, Iowa USA 50703 Tel 319 232 8444 Fax 319 236 0481 [email protected] when roll adjustments are made, running the rolls together with pressure and no feed will greatly accelerate roll wear. Evidence of roll to roll contact would be corrugations with tops
Edge runner mill, also known as Chilean mill or Roller stone mill consists of one or two heavy steel or granite rollers mounted on a horizontal shaft and turned round a central vertical shaft on a bed of steel or granite. The stones may vary from 0.5 to 2.5 m in diameter, the larger size weighing up to about 6 tonnes.
roll machine and belted machine is that the pressure roll drives the temperature up so quickly because of the nip point between the pressure roll and the flute tips. If you flank of the flute if the roll is running faster than the paper speed; if the roll is running slower than paper speed, the glue will be applied to the front flank of the
Jul 13, 2016· 2. Increase the temperature by 5 degrees Celsius when you stop the rolls. Because this helps to maintain a more uniform roll surface temperature. You need to realize that the TCU (Temperature Control Unit) of your rubber calender controls the temperature of the water exiting the rolls and not the ‘roll surface temperature’. This is an
the operator to make the right decision and keep the mill running in such a way as to be close to the optimum pulp density (73% in the above example). It must be kept in mind that the optimum is always very close to the unstable zone. Influence of balls filling degree The performance of ball mills is very sensitive to the ®
Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (–4 to –35 mesh). Grinding action is by line contact between the rods extending the length of the mill. Rods tumble and spin in roughly parallel alignment simulating a series of roll crushers. This results in preferential grinding of
highest at the exit from the roll gap and is denoted as V f. The metal accelerates in the roll gap in the same manner as an incompressible fluid flowing through a converging channel. Fig. (5-3) Because the surface speed of the rigid roll is constant, there is relative sliding between the roll and the strip along the arc of contact in the roll
Sep 15, 2004· If temperature may be monitored on housing we have to reduce our limit another 15F or so to account for limitations of our monitoring. In our plant housing temperatures on most motor bearings are 130F or below. Occasionally after greasing some go to 180F or even 200F. If anything ever remained at these levels 180F-200F by housing I would be
lower. In a compact hot strip mill, which is smaller than other conventional rolling mills, the rolling speed is also low. Especially in thin strip rolling, because strips are rolled with a higher rolling load and low motor speed, the rolling temperature further decreases and is more likely to drop to around the ferritic rolling temperature.
Check the temperature of the part with the no-touch thermometer. For mild cold-rolled steel, the part must be brought to a temperature of no less than 1,500 degrees. Step 4 Quench the part in the water until the water ceases to sizzle, and check the temperature of the part again. It's temperature should be reduced significantly.
Dec 19, 2013· Diagnosis: Judging by your description of the gearbox to the touch of a hand, I estimate its temperature to be around 150 F (or 65 C)—the approximate temperature when the hand has to be lifted within three seconds of touch. That’s too hot, especially since the normal “warm to the touch” temperature would be approximately 104 F (or 40 C).. An oil-temperature rise reacts according to the
In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness, to make the thickness uniform, and/or to impart a desired mechanical property. The concept is similar to the rolling of dough.Rolling is classified according to the temperature of the metal rolled. If the temperature of the metal is above its