A method for controlled rolling of medium-sized bars

Abstract

The invention relates to a rolling control method of bars of medium specifications, and belongs to a material processing engineering technique. When rolled pieces of intermediate billets of the bars are conveyed in a roller way between units, a multi-station rotary cooling mechanism is additionally arranged in an area above the roller way of a rolling line, and the intermediate billets are liftedand rotated and then are put in the roller way of the rolling line, so that the rolled pieces rotate during movement and are uniformly cooled to the required temperature, and the rolling control is realized in the subsequent unit. According to the rolling control method, the rotary cooling mechanism can be matched with water cooling of the intermediate billets and can be separately used; the equipment structure is compact, an additional site is not needed, and the length of a workshop does not need to be increased; the bar microstructures are uniform, and the difference between the grain sizesof the surface and the central structure is less than the 0.5 level; the rolling control method is suitable for a stripping production line between a rough rolling unit and an intermediate rolling unit or between the intermediate rolling unit and a finish rolling unit; and the rolling control method can be used for producing diameter bars, and when the method is used for producing the bars of medium specifications, the problems of difficulty in uniform cooling of the intermediate billets on a continuous rolling production line and influence on the production efficiency can be solved.

Description

technical field [0001] The invention belongs to material processing engineering technology, and relates to a method for controlled rolling of medium-sized rods, in particular to a method for uniformly cooling an intermediate billet in a rotary cooling mechanism. Background technique [0002] With the advancement of industrial steel production technology, controlled rolling technology has gradually been applied in the field of medium-sized bars, and the bars are usually cooled by means of water-cooled boxes before and after the finishing rolling unit. Coolers commonly used in water-cooled boxes include direct injection coolers, laminar flow coolers, turbulent flow coolers, swirl coolers and annular nozzle coolers. [0003] There are four main deficiencies in using the cooler in the water-cooled box to cool the intermediate billet: [0004] 1) For blanks with high temperature drop requirements, it is necessary to have sufficient power to enhance the water pressure to ensure t...

AI Technical Summary

Problems solved by technology

[0004] 1) For blanks with high temperature drop requirements, it is necessary to have sufficient power to enhance the water pressure to ensure the realization (large section size, long water cooling line, and large water volume cannot achieve rapid and uniform temperature drop of the intermediate blank);

[0005] 2) The cooling time is short, the surface temperature drop is too fast, and the center temperature drop is slow, resulting in an excessive temperature difference from the center to the surface;

[0006] 3) When the intermediate blank is conveyed into the water-cooled box by the roller table, the specific position of the lower edge of the intermediate blank will always keep in contact with the conveying channel of the water-cooled box or the pressure of the cooling water will be uneven when the water volume changes, resulting in uneven cooling of the surface of the intermediate blank. thereby affecting the final product performance;

[0007] 4) A water-cooled box contains multiple coolers, and it is difficult to deal with steel pile accidents

However, this device needs to cooperate with temperature sensors and four control valves to independently manage the temperature of the four regions of the material. The structure is complicated, the processing is difficult, and it is not easy to promote.

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