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improving roll cooling on cold tandem mills

Installed in Eregly, Turkey, and linked to an existing continuous pickling line, the new tandem mill of Tatmetal Çelik is in full operation. The mill consists of five, 6-high mill stands with 22,000-kN separating force to roll quality high-strength strip from 0.2 to 3.0 mm thick, up to 1550-mm wide, with superior flatness correction capabilities for 1.2 Mtpy of cold rolled strip...working rolls. Cold rolling shape defects of stainless steel wide strips ... cooling is negligible. The time period between two coils is a little longer, but not enough to create a ... after a long break (over a weekend, for example), when the mill has become cold, several strips must be rolled before the mill gets warm again. Thus, the ...

Tandem cold-mill solutions from Primetals Technologies stand for high product yields combined with flexible production, low operational costs and simplified maintenance work. Depending on the product mix, the production capacity of continuous tandem mills from Primetals Technologies can exceed 1.2 million tons per year...Vibration measurements in tandem mill 2030 have been carried out with the accelerometers being mounted on every of WR and BUR chocks. Thin (0.6 mm) and thick (1.0 mm) strips have different modes of stack movement. Thin strip rolling corresponds to main node in the roll bite but thick strip stiffness shifts node out of rolls and strip contact.

Strip cleanliness in the industrial cold rolling mill must be controlled by optimizing the roll, strip, lubricant and process parameters. Obtained experimental evidence in this work shows which of these parameters have a significant influence on strip cleanliness. The experiments were carried out on a plate-out tester and on cold rolling pilot ...Roll Cooling Our experts can help you improve roll cooling consistency and identify / solve related problems quickly in your cold rolling mill. We provide products and services to help optimize your roll cooling process.

Experimental data from cold rolling tandem mill is used for detecting strip tearing and it is concluded that neural network has high accuracy in distinguishing between perfect and defected rolling. Strip tearing during cold rolling process has always been considered among the main concerns for steel companies. Several works have been done so far regarding the …...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

Lubrication systems for tandem cold rolling mills are mainly classified as either recirculation systems or direct application systems, as shown in Fig. 1.The differences were described by Semoto and Okamoto (1992) with the historical background. Recirculation systems are mainly applied to sheet gauge products, while direct application systems are mainly used …...speed, strip thickness, the properties of the strip, roll gap, contact time and cooling parameters. Most of researches focus on the thermal expansion contour of the work roll, and development of a proper coolant profile to compensate for …

Flat cold tandem mills (see [1]) have the purpose of reducing ... a 6-high mill the rolls are named respectively work roll – WR (i.e. the roll in contact with the material), back-up roll – BUR (the big- ... Selective cooling (SC). The stand is provided of water nozzles distributed along the length of the work roll, in order to...Modern, efficient cold rolling mills can roll pickled sheets or strips at speeds of up to 4 m/s and tandem mills that are continuously working can produce up to 2.5 million tons of cold rolled steel annually. The advantages of cold rolling. Cold rolled products have the following advantages over hot rolled: greater dimensional accuracy

6-high mill at pre-assembling Full range flatness actuators for all cold rolling mill types (9) Intermediate roll set with grease lubricated roller bearings (10) Strip blow-off system (11) Selective roll multizone cooling and emulsion system (12) Back-up roll change device . 04 05...•Roll-strip contact length L •Average strip width w –despite the fact that spreading, or an increase in width, may actually occur if edger mills are not used •Average true stress of the strip in the roll gap Y avg •Assumes no friction and thus predicts lower roll force than the actual value •Power per roll (SI units)= pFLN / 60,000 kW

the entry and exit sides. Third, unlike in the typical cold mill design, there is no instrumentation between the mill stand and the coolant that would otherwise interfere, making cooling on both sides possible. Additionally, in hot mills there is no product staining issue. In a tandem cold mill, one generally only applies coolant on the entry ...There are five stands in the experimental tandem cold rolling mills. All of five stands are equipped with CVC6 settings. The flatness control actuators includes the positive and negative bending of the work roll and intermediate roll, shift of the intermediate …

proper roll cooling, the required thermal roll crown can be controlled in way to influence the overall roll profile. It is common practice adjusting the roll cooling to the strip width being rolled. Roll cooling is hence an actuator to allow stable rolling conditions of the mill. This is particular true for strip tandem rolling mills with regard to...The tandem mills consists out of a series of rolling stands that thin the steel strips. One of our tandem mills works exclusively for the automotive industry, the other produces products for the remaining branches. After having passed through …

driving rolls, roll gap, and strip tension force between rolls) directly from the cold rolling tandem mill . The information includes two modes: perfect ro lling and...For tandem cold mills with work roll shifting, the roll contours of different stands are usually identical to facilitate roll scheduling. For a 1500 6-high mill to be researched, the curve parameters H arc, L arc, H l, and L l were set to 400 μm, 155 mm, 0 mm, and 0 mm. The work roll shift is given by L use.. Cooperative control strategy by shifting work rolls of several stands

Such a mill producing electrical steel sheets must be ① a smaller-diameter work roll mill ... ① to ③ for a tandem cold mill producing electrical steel sheets. ... Future prospects We will continue to improve HYPER UC-MILL technology to contribute to the stable rolling of high-strength materials and thin materials such as high-tensile ...Multi-roll mills Two-stand mills DCR mills Tandem mills Temper mills Foil mills Superimposed strategies and solutions are avail-able for: Pass scheduling and Set-up model Threading and unthreading Tension, torque and/or roll force distribu-tion in multi-stand mills Roll gap stabilization to run wedge strip Entry Thickn. Entry Thickness Deviation

Figure 4. 5-stand tandem mill revamped with Flex-HI in mill stand 4. The main focus of this innovation is clearly dedicated to the revamp of existing 4-high reversing and tandem cold rolling mills. Nevertheless, for new reversing mill installations, this …...emulsions are supplied to the roll bite and rolls for lubrica-tion and cooling. The advantage of recirculation systems includes low oil consumptions, which are preferably applied to tandem cold rolling mills. In direct application systems, high-concentration and low …

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