A Calculation Method of Bloom Rolling Temperature Field Considering Non-uniform Deformation Heat

Abstract

The invention provides a calculation method for a bloom rolling temperature field considering uneven deformation heat, which belongs to the technical field of iron and steel metallurgy. The method first uses the three-dimensional structure finite element method to establish a single-pass rolling calculation model of the bloom; then outputs the stress and strain field during the rolling process; finally uses the two-dimensional temperature finite difference method to establish the single-pass rolling temperature field of the bloom Computational model. The rolling temperature prediction model for rods and wires generally assumes that the heat of deformation is evenly distributed on the entire cross-section, and does not consider the influence of uneven heat of deformation on the rolling temperature field. It is more in line with the actual situation of uneven distribution of deformation during bloom rolling, and can improve the accuracy of the model. Compared with establishing a complete three-dimensional thermal-mechanical coupling model, the indirect coupling method can reduce the modeling scale, shorten the calculation time, and save time and efficiency.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for calculating the temperature field of bloom rolling in consideration of uneven deformation heat. Background technique [0002] In order to improve the impact of segregation on high-carbon steel wire rod products, many special steel companies now use the double-fire process for blooming billets, and use nine-stand continuous rolling mills to roll large-section billets with large deformations and roll them into billets. Afterwards, the high-speed wire rod unit is used to roll into finished products. In the rolling process of large-section billet, due to the use of box-shaped pass and large deformation in each pass, the stress and strain distribution along the thickness and width directions inside the rolled piece are very uneven. The rolling deformation heat is transformed from the plastic work during the rolling process. The plastic work is the integ...

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Problems solved by technology

However, the rolling temperature prediction model for rods and wires generally assumes that the deformation heat is evenly distributed on the entire cross-section, and does not consider the influence of uneven deformation heat on the rolling temperature field, which brings errors to the calculation results.

[0003] Some researchers also use the thermal-mechanical coupling finite element method to establish a finite element model that fully couples the deformation-temperature of the rolling process for calculation, which can consider the uneven distribution of deformation heat caused by uneven deformation. Compared with the structural element for deformation calculation, a temperature degree of freedom is added, resulting in a large amount of calculation and long calculation time

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