Bloom rolling temperature field calculation method considering non-uniform deformation heat

Abstract

The invention provides a bloom rolling temperature field calculation method considering non-uniform deformation heat, and belongs to the technical field of ferrous metallurgy. The method comprises thefollowing steps: firstly, establishing a bloom single-pass rolling calculation model by using a three-dimensional structure finite element method; then outputting a stress and strain field in the rolling process; and finally, establishing a bloom single-pass rolling temperature field calculation model by using a two-dimensional temperature finite difference method. A rod and wire rolling temperature prediction model generally assumes that deformation heat is uniformly distributed on the whole section, the influence of the non-uniform deformation heat on the rolling temperature field is not considered, and compared with a temperature field calculation method considering the non-uniform deformation heat, the temperature field calculation method better conforms to the actual situation of non-uniform deformation distribution during bloom rolling, and can improve the model precision. Compared with establishment of a complete three-dimensional thermal coupling model, an indirect coupling mode is adopted, so that the modeling scale can be reduced, the calculation time is shortened, and time saving and high efficiency are achieved.

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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