Cold rolled strip steel production technology

Abstract

The invention discloses a cold rolled strip steel production technology. The cold rolled strip steel production technology comprises the following steps: uncoiling the strip steel by an uncoiler, allowing the uncoiled strip steel to pass through a welder, feeding to an entry looper of a rolling mill, entering a entry tension unit of the rolling mill, entering a cold continuous rolling unit, conveying the cold rolled strip steel to a flying shear unit, and then using a recoiling machine to recoil the strip steel. The cold rolled strip steel production technology is characterized in that before entering the cold continuous rolling unit, the strip steel is firstly heated by a strip steel heating device, wherein strip steel temperature detectors are arranged at the inlet and the outlet of the strip steel heating device, and used to detect the strip steel temperature at the inlet and the outlet of the strip steel heating device, in order to control heating of the strip steel, enable the strip steel temperature at the outlet of the strip steel heating device to be close to or up to the strip steel targeted temperature before the strip steel enters the rolling mill, so as to meet the required strip steel temperature at the rolling mill inlet. The cold rolled strip steel production technology disclosed by the invention can reduce influence degree of the strip steel temperature to internal friction state of cleaning between the rolls, and improves the lubricating performance in the rolling process, so as to reduce strip steel surface tear defect and rolling mill vibration due to poor lubricating performance.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled steel plate rolling treatment line, mainly by heating the steel plate through the steel plate heating device before entering the rolling mill, reducing the influence of the temperature fluctuation of the incoming steel plate on the lubrication performance of the rolling process, and improving the strip steel and the roll Between the lubricating properties, improve the strip surface quality. Background technique [0002] The rolling process is the process of dragging the rolled piece into the gap between the rolls through the friction formed between the roll and the rolled piece to cause plane compression deformation, in which the frictional force is one of the important factors affecting the deformation of the material and the surface quality of the strip . During the cold rolling process, due to the hardening of the material and the increase in deformation resistance, the rolling pressure in...

AI Technical Summary

Problems solved by technology

[0004] One is to affect the particle size of oil droplets, thereby affecting the lubrication state. The emulsion is an oil-water two-phase dynamic balance system. As the temperature rises, the diameter of the oil droplets increases and the lubrication performance becomes better. However, the temperature of the emulsion should not be too high, otherwise it will affect the emulsification Liquid stability and cooling effect;

[0005] The second is to affect the effect of additives. Most of the additives in the emulsion achieve the purpose of reducing friction and reducing pressure through physical or chemical adsorption with the metal surface. They are particularly sensitive to temperature. There is a critical adsorption or desorption temperature for additives, so they contain The friction coefficient of the additive emulsion changes strongly near the critical temperature

[0008] Chinese patent CN201860472U introduces a strip steel induction heating device. The main problem to be solved is that in the process of strip steel processing, tin plating needs to be carried out on the surface of the strip steel, and in the production of electroplating tin, there is a reflow process. It is to heat the strip steel to the melting point of tin at 231.89°C and then cool it down rapidly. The current method is resistance heating, which consumes a lot of power and the heating speed is slow.

Chinese patent CN201512563U discloses a multi-functional ultra-fast heating equipment and technology for strip steel, which mainly consists of an uncoiler, a strip steel heating device, a water-cooled roll, a cooling box and a coiler. The strip steel heating device, water-cooled roller, and cooling box are transported to the coiler for coiling. The strip steel heating device is a combination of electromagnetic induction heating device and direct electric heating device. The defect that the limiting temperature is difficult to further increase is an invention in the field of strip heat treatment

Chinese patent CN101545036A discloses a steel coil edge heating control method and heating device, the purpose of which is to solve the problem of cracks extending deep in the process of uncoiling and edge trimming due to the temperature difference of the edge of the steel coil. Its main features are: Steel coil edge heating devices are installed on the left and right sides of the steel coil. PLC can control the movement trajectory of the heating plate according to the data of the inner and outer diameter of the steel coil. At the same time, the heating mode of large and small fires can be selected.

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