A kind of uniform cooling system and method for differential temperature rolling of large cylinder section

Abstract

The application discloses a uniform cooling system and method for large-scale cylinder section differential temperature rolling, and relates to the technical field of steel rolling metallurgy technology. The cooling system includes a cooling unit, a temperature detection unit, a data processing unit and a control unit. The cooling unit includes a plurality of inner cooling devices and a plurality of outer cooling devices; the inner cooling device is used for jet cooling the inner wall surface of the barrel section; the outer cooling device is used for jet cooling the outer wall surface of the barrel section, and the plurality of outer cooling devices are used for jet cooling. The device is in one-to-one correspondence with a plurality of internal cooling devices; the temperature detection unit includes a first temperature acquisition device for real-time acquisition of the temperature values ​​of the inner and outer walls of the drum section located on the front side of the roll; the data processing unit can receive the temperature value, and then according to the temperature value , establish a temperature model, and generate a dynamic valve model; the control unit can adjust the flow rate of the inner cooling device or the outer cooling device according to the dynamic valve model. At the same time, the present application provides a method for uniform cooling in differential temperature rolling of large-scale barrel sections.

Description

technical field [0001] The application relates to the technical field of steel rolling metallurgical technology, and in particular, to a large-scale tube section differential temperature rolling uniform cooling system and method. Background technique [0002] Large tube section is one of the key components of major equipment used in nuclear power, petrochemical, coal chemical and other fields. Because it is often used in harsh environments, it has high requirements on its external quality and internal performance. In recent years, with the rapid development of my country's economy, the demand for large tube sections is also increasing. The large cylinder section has a large geometric size (diameter up to 8m, axial width 3m and radial thickness 0.5m), and the weight can reach hundreds of tons. [0003] Differential temperature rolling refers to rolling while cooling during the rolling process, but the cooling does not penetrate deep into the billet, resulting in a distributi...

AI Technical Summary

Problems solved by technology

The differential temperature rolling technology can cope with the large radial thickness of the large-scale cylindrical section, the plastic deformation is uneven during the rolling process, and the metal deformation of the inner and outer layers is prone to be large, while the deformation of the radial center layer of the cylindrical section is small, and even the plastic deformation is difficult to penetrate into the In the core, the grains of the core structure are coarse and uneven, and the coarse grains and uneven grains cause the performance of the barrel section to decrease, and even cracks cause the barrel section to be scrapped.

[0004] However, in the existing annular cooling method, due to the difference in gravity and spray angle of the cooling medium, the cooling of each part of the barrel section will be different, and as the size and thickness of the rolled barrel section change, the required The cooling capacity is also different. In addition, since both sides of the barrel section in the axial width direction contact the outside world, the cooling speed is slower than the center. Therefore, simple annular cooling is not suitable for large-scale barrel section cooling and uniform cooling.

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