Finite Element Analysis Elastic Deformation of Roll System for Cold Rolled Copper Belt

Abstract

According to the characteristics of copper belt’s rolling process, the roll system’s elastic deformation model of Sendzimir twenty roll mill is established, the contact normal stress between the rolls is calculated by using the ABAQUS software and the influence factors of the contact normal stress between the rolls are analyzed. Different controllable factors (such as strip width, the first intermediate roll transverse shifting, ASU adjustment) are analyzed on contact normal stress between work roll and strip copper and elastic flattening amount of work roll by using ABAQUS software to simulate finite element model in a variety of rolling. Introduction The scope of application is expanding for copper and copper alloy belt products, especially communications, electronics, electric power industry and technical requirements are higher development for copper belt products, so the level of production equipment and technical content are also rising .With the development of science & technology and industry, the demand of plate and strip for the high-precision, wide and thin of copper and copper alloy is growing . Thin cold strip production must be outputted by multi-roll mill, especially more variety, low-volume and high strength of cold-rolled strip is needed. Elastic deformation analysis of roll system has the most important position on shape control theory. It has effect on the design of mill roll system structure, as well as optimizing reduction procedures and improving the quality of the shape . In this paper, in order to obtain foundation of the plate-shaped and plate convexity, elastic deformation model of Sendzimir twenty roll mill is built and the data in rolling under different conditions are simulated, what’s more, different controllable factors (such as plate width, the first intermediate roll transverse shifting, ASU adjustment, bending force and so on) and the effect of roll bending, roll flatten deformation, the shape of roll gap and the contact normal stress between rolls are analyzed. 3rd International Conference on Materials Engineering, Manufacturing Technology and Control (ICMEMTC 2016) © 2016. The authors Published by Atlantis Press 1810 Finite element analysis of rolls’ elastic deformation A. finite element model According to the geometric parameters and material properties of Sendzimir twenty roll mill, three-dimensional finite element analysis model is built. As can be seen from Figure 1, due to the symmetry of the roll system, only a quarter of the model can be analyzed. In the model, grids are divided more intensive in large deformation or stress concentration area, some are sparse, so the cells in internal of roll are divided widely; the closer to the surface of the roll, the cells are divided thinly. There are wedge (triangular prism) and hexahedral elements to analysis the three-dimensional problem, in this paper, C3D8R (eight-node linear hexahedral elements) is selected as the solid elements. Grids of rolls are divided as shown in Figure 1; there are 43764 nodes and 35896 units. Fig. 1 Rollers' finite element mode of the sendzimir mill stand B. Simulation of the production data Production data can be measured by ZR33C-18 hydraulic reversible cold rolling mill which can product thin copper belt stably. Field data are shown in Table 1, Table 2 and Table 3. Table 1 model:ZR33C-18 Copper belt width:320mm Copper belt model:C521 Number 0 h /mm 1 h /mm h ∆ /mm 0 T /KN 1 T /KN P /KN 1 0.420 0.286 0.134 4.4 10.4 183.0 2 0.286 0.200 0.086 8.8 9.3 270.4 Table 2 model:ZR33C-18 Copper belt width:400mm Copper belt model:C521 Number 0 h /mm 1 h /mm h ∆ /mm 0 T /KN 1 T /KN P /KN 1 0.700 0.455 0.245 12.2 23.9 353.0 2 0.455 0.341 0.115 19.5 20.5 405.8 3 0.341 0.256 0.085 16.0 16.9 408.3 4 0.256 0.197 0.059 13.0 13.7 377.9 5 0.197 0.160 0.037 10.8 11.4 321.9