Finite Element Solution Of Scroll Pressure Of Down-coiler For Hot Strip Mill

Coiler is an important auxiliary attachment in the steel-rolling workshop and is extensive used in strip steel and wire stock manufacture. The functional state of coiler can directly influence the productive power of the rolling mills, particularly of the tandem mills. The calculation of the scroll pressure is the premise of the calculation of the coiler strength and compensator pushing force, and is directly related with the coiling quality. So it is very important to compute the scroll pressure accurately for the hot strip tandem rolling. It is considered that the scroll pressure is related with many elements such as coiling tension, diameter of the coiled stock, radial rigidities of the coiler and the coil of strip, what抯 more, mediator, sliding and friction between the strip layers, surface state and width of the strip are also included. For all these reasons, the calculation of the scroll pressure is a complex project. Some formulas and their deducing methods are introduced in the head of this article and in order to determine the minimal number of layer of the coiled strip before the processing of the steady coiling, the FEM software MARC is used to simulate the expanding process of the coiler. The displacement of the first layer of strip along the coiler surface, the friction force between the coiler and strip and the scroll pressure after the expanding of coiler are calculated under different number of strip layer and different strip thickness. In this article, the simulation of steady coiling process is also finished using software MARC. The distributions of pressure and the stress in the strip are analyzed accompanied with three important elements (coiling tension, friction between the strip layers and diameter of the coiled strip) that have cardinal effects on the scroll pressure and the relation between the coiler and the three elements are achieved. For the convenience of the engineering calculation, a simple equation for scroll pressure calculation is obtained on the base of the calculating results and it has very important meaning to the -H- Abstract manufacturing of the hot strip tandem rolling. In the end of this article, the results are compared with four formulas that had been deduced h~?other authors and it shows that the simulation is in coincidence with the practical conditions and the simulation method is available to the coiling process.