torque speed characteristics of rolling mills The Calculation of Roll Force and Torque in Hot Rolling Mills. Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by Orowan, together with von Kármán's equation of equilibrium.
Jan 06, 2016· A hoisting speed of 0.5 m/s corresponds to a drum speed of 19 rev/min, so a suitable gear ratio would be say 80:1, giving a maximum motor speed of 1520 rev/min. The load torque, as seen at the motor side of the gearbox, will be reduced by a factor of 80, from 2500 to 31 Nm at the motor.
Jan 01, 2001· From Eq.(11) in Section 3, it is known that the torque amplification factor (TAF) is a function of the normal rolling force and the rolling speed.Assuming the rolling speeds to be 10, 20, 30, 40, 50, 60 and 70 rpm, respectively, the relationship between two stations of the normal rolling force and the torque amplification factors as shown in Fig. 7 are obtained.
Jun 01, 1954· There is close agreement between the calculated and measured roll loads, but the roll torque is over-estimated slightly by the theory, above reductions of about 30 per cent in thickness.
Jan 01, 2015· Frequency response characteristics of the rolling mill at change of the speed setting for the first stand (1,2- for rolling speed 1.78 m/s, 3,4- for rolling speed 17.8 m/s; 1,3- for the first inter-stand gap, 2,4- for the second inter-stand gap).
Table 8.36a describes the features and characteristics of a typical rolling mill, which speciﬁcation deﬁnes the equip- nation of drive speed as well as of torque. TABLE 8.36a Typical Rolling Mill Speciﬁcation on the market can give full output torque over the entire speed range with proper motor cooling. High efﬁciencies are
T dynm = Torque required to accelerate the rotating masses during increase in rotational speed. In many rolling stands the rolling speed is increased after the start of rolling of strip. De- acceleration is done towards the end of rolling.
torque speed characteristics of rolling mills The Calculation of Roll Force and Torque in Hot Rolling Mills. Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by Orowan, together with von Kármán's equation of equilibrium.
Abstract. Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by Orowan, together with von Kármán's equation of equilibrium. Although applying strictly to the rolling of ideal plastic-rigid materials, these equations may be
Jan 01, 2001· From Eq.(11) in Section 3, it is known that the torque amplification factor (TAF) is a function of the normal rolling force and the rolling speed.Assuming the rolling speeds to be 10, 20, 30, 40, 50, 60 and 70 rpm, respectively, the relationship between two stations of the normal rolling force and the torque amplification factors as shown in Fig. 7 are obtained.
torque speed characteristics of vertical raw mill. The design consists of a number of small vanes set radially in a wheel governing is automatic of yaw by tail vane, and of torque by setting the wheel offcentre with respect to the vertical yaw axis thus, as the wind increases the mill turns on its vertical axis, reducing the effective area and therefore the speed
Oct 24, 2019· In the design of piecewise rolling mills for seamless pipe, careful attention is paid to overloading and dynamic decrease in speed of the drive motors, since the rolling torque depends directly on the roller speed and so slight decrease in motor speed may greatly lower the
The working roll diameter is 500 mm. Determine the rolling load on the rolling stand if the co-efficient of friction is 0.07. Also determine the rolling torque. Solution: Example 2: A billet of area of section 150 mm x 150 mm is rolled to 120 height in a rolling mill with 600
MILL LOAD Roll Force, Torque, Power The Mill Load application is specifically developed for mill design/operation engineers to calculate roll separating force, rolling torque and power, etc. Typically, load calculation is needed for an existing mill when a new rolling process is applied either with higher reduction or in lower temperature or higher speed, or for a stronger material.
Nov 27, 2015· If a mill rolls 80 % of the calendar year, that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tons/hour. If the utilization can be improved by 1 %, the available rolling hours is 365 x 24 x 0.81 = 7096.6, creating 87.6 extra rolling
Speed-torque characteristics of the load must be known to calculate the acceleration time and to select the proper type of motor to suit the load. The load speed-torque characteristics of industrial loads are generally non- analytical function T L = f (ω). However, some of them may be approximated to an analytic form such as : 1- Constant
Jul 20, 2016· 3. Rolling mills o The process of deforming metal by passing it between rolls o Rolling mill is a machine or a factory for o shaping metal by passing it through rollers o to crush or grind various materials, such as grain, ore, gravel, plastic, and others o A rolling mill basically consists of o
Aug 10, 2020· The torque-speed characteristic describes the load torque as function of rotational speed. The paragraph about torque-speed characteristics considered a steady state operation or start-up and braking with limited dynamics. crushers, some conveyors etc. Rolling mill drives are the champions of dynamics. Figure 4a: VFD for high dynamic
Motors for Metal Rolling Mills. AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as
torque speed characteristics of vertical raw mill liming(USA),INC medium-speed roller mill, Torque Speed Curves One commonly used method of displaying motor characteristics cement ball mill critical speed
Large PWM Inverters for Rolling Mills Hiromi Hosoda output torque can adjust to the required rolling torque. Then the motor speed slowdown is stopped and accelerated to the speed The high performance speed and torque characteristics of the dc drive systems could now be implemented without the dc motor commutation limitations.
The rolling mills drivelines are under investigation. Their dynamics is characterized by the extremely high torque amplification factors. The main problem is to identify non-smooth piece-wise linear stiffness characteristics in the multi-body system
Oct 24, 2019· In the design of piecewise rolling mills for seamless pipe, careful attention is paid to overloading and dynamic decrease in speed of the drive motors, since the rolling torque depends directly on the roller speed and so slight decrease in motor speed may greatly lower the
The paper verifies that the characteristics of the rolling mill including aligning ability depend on the rolling speed. The structure of the autom atic speed and motor torque control system
It was found that the rolling speed, the nonlinear friction and the thickness of the strip have strong influences on the stability of rolling mill [18-20]. T p, T g are the input torque and the load torque, Liu H. Analysis of vertical-horizontal coupling vibration characteristics of rolling mill rolls based on strip dynamic deformation
MILL LOAD Roll Force, Torque, Power The Mill Load application is specifically developed for mill design/operation engineers to calculate roll separating force, rolling torque and power, etc. Typically, load calculation is needed for an existing mill when a new rolling process is applied either with higher reduction or in lower temperature or higher speed, or for a stronger material.
Large PWM Inverters for Rolling Mills Hiromi Hosoda output torque can adjust to the required rolling torque. Then the motor speed slowdown is stopped and accelerated to the speed The high performance speed and torque characteristics of the dc drive systems could now be implemented without the dc motor commutation limitations.
Nov 27, 2015· If a mill rolls 80 % of the calendar year, that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tons/hour. If the utilization can be improved by 1 %, the available rolling hours is 365 x 24 x 0.81 = 7096.6, creating 87.6 extra rolling
The speed reducer plays a role in matching the rotational speed and transmitting torque between the driving link and the working machine or the actuator and is widely used in the rolling mill. The working characteristics of the speed reducer are low speed, heavy load, large impact load, frequent impact times, and continuous operation.
Speed-torque characteristics of the load must be known to calculate the acceleration time and to select the proper type of motor to suit the load. The load speed-torque characteristics of industrial loads are generally non- analytical function T L = f (ω). However, some of them may be approximated to an analytic form such as : 1- Constant
23. Rolling Mills: Rolling of steel, the process during which the cross section of the metal gets reduced, while increasing its length proportionately, is the major function of steel mills. Rolling mills are usually classified according to the material produced by them. The principal types of mills, classified according to their products rolled
The rolling torque calculating section 101 may be arranged to calculate the total torque according to the known rolling theory in the equal peripheral speed rolling operation on the basis of the rolling conditions such as characteristics of rolling mill, the entry and exit thickness of the rolled material, the rolling load, and the hardness of
Jul 04, 2013· Speed Vs Torque characteristics of DC Series motor • The Speed Vs Torque characteristics of dc series motor will be similar to the Speed Vs Armature current characteristics it will be rectangular hyperbola, as shown in the fig. Like: 1) Traction 2) Hoists and Lifts 3) Crane 4) Rolling mills 5) Conveyors 34.
Oct 28, 2016· 18. The starting torque in case of centrifugal pumps is generally (a) less than running torque (b) same as running torque (c) slightly more than running torque (d) double the running torque Ans: a. 19. Which of the following motors are best for the rolling mills ? (a) Single phase motors (b) Squirrel cage induction motors
Feb 08, 2021· Rolling of Steel Plates in a Plate Rolling Mill. Plate steel is defined as a flat, as-rolled or heat treated product of thickness of at least 5 mm and width of at least 1,200 mm. Plate steel is widely used steel product. It falls normally in the categories of carbon steel, high strength low