Control method and control device of rod and wire production line temperature control rolling process

Abstract

The invention is suitable for the field of low temperature rolling, and provides a control method of a rod and wire production line temperature control rolling process. The method comprises the steps of determining a critical phase change temperature and a critical cooling speed of a rolled piece generation phase change tissue according to the a steel type and a corresponding continuous cooling transition curve characteristic; calculating the water cooling time according to a length value of a water tank and a rolling speed of a rolled piece, and calculating a corresponding maximum water flow rate at the critical phase change temperature and the critical cooling speed according to the water cooling time and the cooling water temperature; acquiring an initial value of the water flow rate within the maximum water flow rate range; calculating a uniform temperature of the rolled piece according to a heat transfer relation of each node of the rolled piece; judging an absolute difference value of the uniform temperature and a target temperature to exceed a first preset threshold value, adjusting the water flow rate, re-calculating the uniform temperature, and calculating the water flow rate which cannot satisfy the first preset threshold value. By adopting the control method, the automatic derivation of process parameters in the temperature control rolling process can be realized, and the low efficiency and inaccuracy for a traditional method for referring to the existing engineering or experience in the prior art can be overcome.

Description

technical field [0001] The invention belongs to the field of low-temperature rolling, and in particular relates to a control method and device for a temperature-controlled rolling process of a rod and wire production line. Background technique [0002] In the production process of hot-rolled rods and wires, the strength of steel and the toughness of steel can be improved by refining the grains, which is the unique feature of the controlled rolling process, and it is also beyond the reach of other methods such as adding rare alloy elements. . The controlled rolling process of the bar and wire production line is mainly temperature controlled rolling. Practice has proved that the application of temperature-controlled rolling process and post-rolling controlled cooling process on the rod and wire production line can replace micro-alloyed or low-alloyed steel with low-carbon steel, and the obtained product has good quality, high metal yield, and low production cost. It has brou...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a control method for the temperature-controlled rolling process of the rod and wire production line, so as to solve the problem of determining the temperature-controlled rolling process parameters of most rod and wire production lines in the domestic prior art. The production line, engineering design is out of touch with actual production, equipment parameters and process layout are not reasonable, resulting in waste of resources

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