저자명 박상래 
년도 2001 
This paper is concerned with a simulation-based process design for the tension levelling of metallic strips based on the elasto-plastic finite element analysis with reduced integration and hourglass control. The tension levelling process is performed to elongate the strip plastically in combination of tensile and bending strain by a controlled manner so that all longitudinal fibers in the strip have an approximately equal amount of length and undesirable strip shapes are corrected to the flat shape. The analysis deals with a method for calculating the quantitative level of the curl to investigate the roll arrangements and intermesh suitable to elimination of the curl. The analysis provides the information about the intermesh effect on the amount, the tension effect and distribution of the strain as well as the stress in order to determine the amount of elongation for correction of the irregular shape. The desired elongation is referred to determine the number of work rolls and the value of tension. For the first time, the analysis investigates the effect of the mesh size in the non-steady state finite element analysis on the amount and distribution of the strain and the mesh size is selected to perform the finite element analysis for the tension levelling process with the consideration of the time and economic probability of the analysis.
We select several kinds of unit models which is actually used in the tension levelling process line and look into strain and stress history at the designated point along the thickness of the strip, levelled strain, residual strain and the deformed shape of the strip after the levelling and the springback with respect to the variation of the intermesh and the tension for each of the unit model. We also examine the down force at the down roll and the tension of the right of the strip with respect to the variation of the intermesh and the tension for each of the unit model. This finite element analysis is performed is two cases; the one is the smooth strip without the shape defects, the other is the strip with the shape defects.
On the basis of this fundamental analysis for each of the designed unit model, we design the total tension leveller and carry out the finite element analysis on this total tension leveller. In the similar to the unit model, we look into strain and stress history at the designated point along the thickness of the strip, levelled strain, residual strain and the deformed shape of the strip after the levelling and the springback with respect to the variation of the intermesh and the tension in the smooth strip and the strip with the shape defects. These shape defects often can be appeared after the actual cold and hot rolling process. We will find the process parameter to minimize the curvature of the deformed shape of the strip after the levelling and the springback for the designed tension leveller.

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