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the roll, because the sensors are on centers of 45 cm, 60 cm, and 75 cm. If there are disadvantages when compared to carbon, they are as follows: the information is not continuous across the roll face length; the equipment is expensive and not as readily available as carbon paper. The advantage is .
Nov 27, 2015· Excess billet gap can be an unaccounted for loss of rolling time. If a mill rolls 800,000 tons per year using billets of ton weight, it rolls 640,000 billets per year. That is 639,999 billet gaps. If the average billet gap is 5 seconds that is (5 sec x 639,999)/3600 sec/hour = hours of billet gap.
A precision rolling mill, built in 2003, with 140 mm roll diameter of the Prymetall company was used for the experiments. During the rolling of the OFCu bars the rolling force was measured. There were no forward and backward tensions applied on the copper bars and rolling speed was reduced to a minimum of about m/min.
How to Calculate Wall Size Based on OD and ID By David Robinson Hunker may earn compensation through affiliate links in this story. The thickness of a pipe wall depends on its purpose and the materials from which it is constructed. The outside of a pipe is always larger than the inside. The difference between the inside diameter, or ID, and the ...
Jan 08, 2014· Design a new product to roll on an existing mill. Creating the rolling plan, calculating the power and roll loads, and analyzing the suitability of the equipment to provide the necessary power and torque and withstand the rolling loads. Extend the size range of products already rolled on an existing mill.
This function also contains mathematical models which calculate the optimum rolling setups for the mill ( gap, speed, force, temperatures). The next lower level of control, level 1, is the basic automation which controls the basic sequences and automation functions of the individual equipment in the hot mill.
In EXAKT Three Roll Mills, a defined gap is achieved between the rollers by the special machine geometry and precise mechanical system. Controllable circumferential speeds of the rollers and an absolutely parallel gap create a uniform shear rate. This ensures that all of the material is consistently
Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips. In most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and verticalhorizontal directions, or the multiple rolls system is simplified to a single mass system. However, the torsional chatter is also a typical type of mill chatter, and the ...
thickness, roll gap, and rolling force can be expressed by spring equation Eq. (1): M F h S 0 0 (1) where S 0 is unloaded roll gap; F 0 is rolling force; M is the mill stiffness or mill modulus. The strip thickness reference has to be created first during the lockon process by
Jan 01, 2007· The process control for finishing rolling is divided into three phases, mill setup, realtime control, and setup model learning. Mill setup presets the initial settings of the mill parameters such as roll gap and roll speed using a mathematical setup model before a sheet bar (at roughly 1100°C in temperature for mild steel) enters the process.
The first stage, when the strip head left out of the last finishing mill and signal is 1, the speeds of the hot run out table and the pinch roll are greater than the speed of the strip out of the last finishing mill, the speed of mandrel is greater than the speed of pinch roll. Therefore the speed given of the hot run out table, pinch roll and
When Rolec set up our new brewhouse, one of the things Harry Klaussner, the brewmaster, did was to adjust the gap settings on our fourroll Kunzel mill. He did this by eyeball. We started up the conveyor and the mill, and Harry knelt on top of the grist case and .
Rolls are tools used in rolling mills to reduce the cross section of metal stock. The weight of rolls may vary from a few kilograms up to 250 tonnes. Under rolling conditions the contact area between roll and stock suffers wear, the other parts of a roll body and necks have to be considered as normal parts of designed components under high ...
Roll Force Measurement ABB''s Millmate roll force system is the perfect choice for measuring roll force in both hot rolling and cold rolling mills, thereby achieving correct roll gap settings and force distribution. The system is proven to be exceptionally robust and resilient to high forces as well as aggressive mill agents.
In order to analyze the influence of technical parameters on work roll axial force of fourhigh continuous variable crown (CVC) mill, the deformation analyzing model with top roll system and strip was established based on influence function method. Then a CVC work roll curve designing scheme was proposed and it was carried out on some cold rolling mill considering the .
mill is required. Pass Design The leader sections for the multiple slit rolling process, 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
Roll Diameter in Converting Processes. Gap and Layon Rolls. Lay on rolls applied in gap winding must precisely follow the roll diameter accurately throughout the winding process. ... In this method of diameter calculation, velocity is integrated over time to
Jun 22, 2004· Rod and Bar Rolling: Theory and Applications highlights the underlying relationship between solid mechanics and materials science. It provides a detailed overview of the deformation of material at high temperatures, an assessment of rod and bar rolling processes, and an indepth review of the basics of hot rolling, elasticity, plasticity, and recrystallization for a clear understanding of the ...
Modern rolling practice can be attributed to the pioneering efforts of Henry Cort of Funtley Iron Mills, near Fareham, England. In 1783, a patent was issued to Henry Cort for his use of grooved rolls for rolling iron bars. With this new design, mills were able to produce 15 times more output per day than with a hammer. Although Cort was not the first to use grooved rolls, he was the .
(Mill Modulus) applies a gap correction so as to achieve the desired thickness reduction. ... Sims,, "The calculation of roll force and torque in hotrolling mills", ... constitutive ...
This results in a differential in speed between the roll pair. Typical differentials range from :1 to :1 (fast to slow). Typical roll speeds would be 1,300 feet per minute (~ 395 m/min) for a 9inch (~23 cm) roll to 3,140 feet per minute (~957 m/min) for a 12inch (~ cm) roll.
Jun 18, 2014· Roll pass design is an essential part of long product rolling process, since the long products are rolled between the shaped rolls in the long product rolling mills. Roll pass design generally means the cutting of grooves in the roll body through which steel to be rolled is made to pass sequentially to get the desired contour and size.
Another common calculation performed in the size analysis procedure is to determine the "log ... This roll gap adjustment needs to be quick and easy and must ... and no roll speed differentials. Mills used to grind will operate with higher roll speeds 1,500 Ft/min ( M/sec) up to 3,000 Ft/min (M/sec) with roll speed differentials. Roll ...
The cold mill roll gap should start out being set to the same profile as the crown of the incoming hot mill product. Then, as the cold mill gap is adjusted to reduce the crown, the coil also will come out flatif the hot mill got the relationship between crown and flatness right to begin with. If the cold mill rolls or hot mill .
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