Cold Mill Roll Force Calculation

Cold Mill Roll Force Calculation

Online calculation model of rolling force for cold rolling ...

An online calculation model of rolling force was setup for a tandem cold rolling mill. Experimental data of a huge industrial rolling mill showed that the errors of the predict model were less ...

Fundamental concept of metal rolling - mtixtl.com

Example: Calculate the rolling load if steel sheet is hot rolled 30% from a 40 mm-thick slab using a 900 mm-diameter roll. The slab is 760 mm wide. Assume µµµµ= 0.30. The plane-strain flow stress is 140 MPa at entrance and 200 MPa at the exit from the roll gap due to the increasing velocity. h h h mm h mm x h x h h h o f f f o o f (40) (28 ...

Coil & Sheet Calculators | Steel Warehouse

Contact Us. Steel Warehouse Headquarters 2722 West Tucker Drive South Bend, IN 46619 . Phone: 800-348-2529 Fax: 574-236-5154 Find More Locations . Mail Login

Roll force measurement | ABB

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.

New Rolling Method R f Reversing Cold Rolling Mill

New Rolling Method Rf Reversing Cold Rolling Mill Tanehiro Kikkawa JP Steel Plantech Co., 3-1, Kinko-cho, Kanagawa-ku, Yokohama 221-0056, Japan Tel: +81-45-440-5942 ... reduction is carried out by the roll force cylinders in the mill, and tension between the mill and each reel is …

Rolling of Metals: Process and Principles (With Diagram)

The rolling process is shown in Fig. 2.1: Rolling is done both hot and cold. It is accomplishes in rolling mills. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Rollers may be plain or grooved depends upon the shape of rolled product.

The calculation of rolling force - Innoval Technology ...

The roll separating forces obtained in a single-stage pass of 55% reduction and two two-stage passes of 14/39% and 20/33.6% reduction are given in Figure 15.4, measured when rolling the softer AISI 1008, deep-drawing quality steel. Figures 15.2 and 15.4 are quite similar. The dynamic response of the mill is also similar to the previously observed behaviour.

The Calculation of Roll Force and Torque in Hot Rolling Mills

The Calculation of Roll Force and Torque in Hot Rolling Mills R. B. Sims, B.Sc. Proceedings of the Institution of Mechanical Engineers 1954 168 : 1, 191-200

Chapter 4 Surface finish and friction in cold metal rolling

In most cold rolling operations, lubricant is used to reduce frictional forces, to protect the roll and strip surfaces, and to act as a coolant. The amount of oil drawn into the roll bite and the initial surface roughness are the critical factors determining friction in the contact and surface finish of the product (Schey, 1983a and 1983b).

Precise Rolling Force Calculation for the Tandem Cold Mill ...

Rolling force is the most important technical parameter for the tandem cold mill. In this paper, the precise models and calculation process for the rolling force are introduced. The rolling force model is based on the Bland-Ford and Hill theory, and the roll flatten radius is calculated with the Hitchcok's formula. The deformation resistance of the strip is calculated with the model, whose ...

POWER IN ROLLING

The ratio λ = [ a/Lp] = [a/√R.∆t] is used to calculate the moment arm 'a' λ =0.5 for hot rolling and 0.45 for cold rolling. The torque is equal to the product of total rolling load and the effective moment arm. Since there are two work rolls Torque Mt = 2P.a Consider two high roll mill as shown in the figure.

Rolling Process: Working, Application, Defects, Type of ...

Cold Rolled Product: Cold rolled product is made from the hot-rolled product. When the hot-rolled product is cooled, then that is re-rolled in the room temperature. It is known as Cold Rolled Product. It is used to do to get more exact or perfect dimensions and to make the surface quality better. There are such Cold rolled products.

The calculation of roll torque and roll separating force ...

Apr 01, 2012· The χ is about 0.5 for hot rolling and 0.45 for cold rolling. 3. Experimental work. Deformation is implemented by using a rolling mill which was built in a domestic factory. The work roll of the mill has a diameter of 1070 mm. The thickness of 320×1800×3650 (mm 3) cast slab is reduced to 303 mm in initial-sizing rolling (the No. 1 pass ...

Axial Force Analysis and Roll Contour Configuration of ...

In order to analyze the influence of technical parameters on work roll axial force of four-high 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 requirement of ...

by Umut Hanoglu Supervised by Prof. Božidar Šarler

ROLLING MILL ROLLING FORCES ... Hot, Warm and Cold rolling Work and Back-up rolls ... is the roll force in N, is the length of the roll in mm, is the elastic modulus in Pa, is the moment of inertia, is the shear modulus in Pa and is the cross sectional area in mm2 …

(PDF) Review on Cold Rolling Mill Roll Deformation

Sep 26, 2020· calculate d results show th at the specific f orces such as the rolling force, int ermedi ate force an d the shape and profile of t he str ip for this specia l roll ing pr ocess are si gnificantl ...

Taper Tension for Rewind Control: Definitions & Processes ...

Taper Tension for Rewind Control. Posted by Bryon Williams & filed under Article Library, Technical Papers.. Center winding film or other extensible material comes with inherent difficulties. If you maintain a constant tension on the web, as the diameter of the roll increases, the wraps become tighter.

Rolling processes - Al-Mustansiriya University

In cold rolling, the value is around 0.1; in warm working, a typical value is around 0.2; and in hot rolling, m is around 0.4. ... If so, calculate the roll force, torque, and horsepower. Solution: The draft attempted in this rolling operation is ... Various rolling mill configurations are available to …

Chapter 13 What is rolled? Rolling of Metals

Reducing Roll Force ¾Why are roll forces bad? Can cause deflection and flattening of the rolls ... Cold rolling produces fine surface finishes ... surface finish similar to sand casting. ¾Gage numbers The thicker the sheet – the lower the gage number. 3 Page 13-13 Rolling Mills ¾Rolled product may be Up to 5 m wide Thin as 0.0025 mm ¾Roll ...

Deformation Processing - Rolling

– Calculate roll separation force ("rolling force") and torque – Processing Limits – Calculate rolling power. Prof. Ramesh Singh, Notes by Dr. Singh/ Dr. Colton 13 Flat Rolling Analysis • Consider rolling of a flat plate in a 2-high rolling mill

Fundamentals of Roll Cooling and Control of Flatness at ...

PRIMARY COLD REDUCTION (DARON LLOYD MANAGING DIRECTOR, LECHLER LTD) PREAMBLE In the process of Rolling the most significant aspect is the generation of heat through friction and deformation in the roll bite and in a typical Cold Tandem Mill, work roll temperatures normally fall in the range of 55oC – 70oC with strip

Advanced Reversing Cold Mills by Primetals Technologies

Steel rolled in two-stand reversing cold mills is suitable for a wide range of applications, offering the best possible performance in terms of quality and productivity. A two-stand reversing cold mill can deliver capacities between 300,000 t/a of thin-gauge products …

Strip Thickness Control of Cold Rolling Mill with Roll ...

Nov 12, 2013· necessary compression force is applied by hydraulic rams, or in many older mills by a screw arrangement driven by an electric motor [6]. Figure 1. The rolling process (flat rolling). 3. Mathematical Model of Cold Rolling Process . 3.1. Force Equation . Define the theory for prediction of specific roll force is

(PDF) Flatness Defect in Thin Strip Cold Rolling and the ...

Nakhoul et al. studied the impact of friction and strip tension on the flatness of a rolled thin strip, and the study showed that the optimal setting of the work roll bending force should be ...

The Calculation of Roll Force and Torque in Cold Strip ...

Jun 01, 1948· From an approximate theory, equations are derived for roll force and torque with and without front and back tensions applied to the strip. Where tensions are applied the calculations for each pass take about an hour; without tensions, and with the use of curves given in this paper, they can be carried out in ten minutes.

The basics of roll form tooling design

For the section in Figure 3, which is made of 0.060-in. cold-rolled steel with a yield strength of 35 KSI, a 2- or 3-degree overform is required to overcome the springback effect. Materials that have high elongation rates, such as aluminum, may need only 1/2 or 1 degree, while high-strength and high-yield materials may require 5 to 15 degrees ...

A simplified method to calculate the rolling force in hot ...

May 27, 2016· Sims RB (1954) The calculation of roll force and torque in hot rolling mills. Proc Inst Mech Eng 168(1):191–200. doi: 10.1243/PIME_PROC_1954_168_023_02 Article Google Scholar

Study of Rolling Force Calculation Models for Cold Rolling ...

For cold rolling process, the theoretical Bland-Ford-Hill model and Hitchcock model are used for the rolling force and roll flatten radius calculation. Friction coefficient and deformation resistance are calculated with empirical regression models. From rolling force model, the recalculation model for the friction coefficient and deformation resistance can be derived.

A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING …

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 ...

A determination of the total roll separating force during ...

model of rolling force during rolling of bimetallic rods. Re-sults of calculation by analytical model are compared with results of FEM model and experimental data. Therefore, the present study has derived theoretical for-mulae that enable the calculation of the overall roll sepa-rating force during the rolling of the bimetallic rods in the ...

Rolling Force Of Cold Rolling Mill

Rolling force in China is called rolling pressure or total rolling pressure. Rolling force is the foundation to determine the strength of rolling mill. Correct calculation and determination of the rolling force have great significance for the design and use of cold rolled ribbed steel machine. There are two categories of Factors affecting the ...

Forces and Drafts in Flat Rolling - Wolfram Demonstrations ...

Details. The maximum change in plate thickness that can be achieved in a single pass is given by:, where is the coefficient of friction between the rollers and the plate, is the roll diameter, is the original plate thickness, is the final plate thickness, and is the maximum draft. To calculate the draft, the first step is to determine the contact area between the roll and the plate by ...

(PDF) Methodology for Calculation of Rolling Load and ...

Methodology for Calculation of Rolling Load and Forces Acting On Herringbone Gear Using Hot Rolling Theory

Online calculation model of rolling force for cold rolling ...

Based on comprehensive consideration of elastic and plastic deformation of both strip and work roll, an online rolling force model for tandem cold rolling Online calculation model of rolling force for cold rolling mill based on numerical integration - IEEE Conference Publication