Finite element simulation method for multi-rack cold continuous rolling plate shape

Abstract

The invention relates to a finite element simulation method for a multi-rack cold continuous rolling plate shape, and belongs to the technical field of plate and strip rolling in the metallurgical industry. According to the technological parameters of the subsequent passes of cold continuous rolling, cold rolling single-stand models are sequentially established; each rolling pass in the cold continuous rolling process serves as a sub-model, and the sub-models are connected in series to form an integral continuous rolling model through data transmission between the models. The method has the advantages that the sub-models are calculated one by one through the steady-state unit redivision technology, the calculation speed is high, and the requirement for a calculation platform is low; in addition, through the transmission and inheritance of the overall equivalent plastic strain in the plate and strip cold continuous rolling process, the accumulation of the equivalent plastic strain of the strip steel in the subsequent pass is realized, so that the sub-models in the cold continuous rolling process are connected in series into a whole, and the continuous prediction and analysis of the convexity and the rolling force of the strip steel plate in the cold continuous rolling process are realized.

Description

technical field [0001] The invention relates to a multi-stand cold continuous rolling flat finite element simulation method, which belongs to the technical field of strip rolling in the metallurgical industry. Background technique [0002] With the rapid development of the domestic manufacturing industry, especially the continuous progress of automobile lightweight technology, higher and higher requirements have been put forward for the strength, surface quality and dimensional accuracy of cold-rolled high-strength steel. During the cold rolling production process, the deformation resistance of the strip increases with the strength of the steel grade, which further leads to an increase in the required rolling force, resulting in greater elastic deformation of the rolling mill stands, rolls, etc. Therefore, in the production of high-strength steel, due to the above factors, the shape of the finished strip (including cross-sectional shape and flatness) has a large error with t...

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Problems solved by technology

[0005] Using the current finite element commercial software to analyze the continuous cold rolling process, if a complete cold rolling strip shape analysis model is established, it will generally involve millions of units, resulting in a sharp decrease in the calculation time step and a substantial increase in the calculation time , so it will consume a lot of computing resources, and it is difficult to determine the correctness of the calculation results in a short time

The current finite element commercial software generally provides element redivision technology for the analysis of large deformation process, but there are many cases where the total reduction rate is above 60% in the continuous cold rolling process, if only the elements provided by the finite element commercial software are used The redivision technology will inevitably lead to a sudden increase in the number of strip steel elements and distortion and distortion of local elements, resulting in difficulties in calculation convergence or even termination

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