阅读说明：本技术 一种控制低碳钢热轧酸洗板横折印的方法 (Method for controlling transverse crease of low-carbon steel hot-rolled pickled plate ) 是由 刘英明 孙荣生 王静 毛玉川 蔡顺达 于 2020-03-31 设计创作，主要内容包括：本发明涉及冶金轧制技术领域的一种控制低碳钢热轧酸洗板横折印的方法,通过合理控制热轧原料卷的温度、开卷速度、防皱辊位置及拉矫机各轧辊的插入量等工艺参数,可有效防止低碳钢热轧酸洗板产生横折印缺陷的几率,提高产品质量,满足客户供货需求,提高企业经济效益。(The invention relates to a method for controlling the transverse crease mark of a low-carbon steel hot-rolled pickled plate in the technical field of metallurgical rolling, which can effectively prevent the probability of the transverse crease mark defect of the low-carbon steel hot-rolled pickled plate, improve the product quality, meet the supply requirement of customers and improve the economic benefit of enterprises by reasonably controlling the process parameters such as the temperature of a hot-rolled raw material coil, the uncoiling speed, the position of a crease-resistant roller, the insertion amount of each roller of a tension leveler and the like.)

1. The method for controlling the transverse crease mark of the low-carbon steel hot-rolled pickled plate is characterized in that the transverse crease mark defect of the low-carbon steel hot-rolled pickled plate is prevented by reasonably controlling the temperature, the uncoiling speed, the position of a crease-resistant roller and the insertion quantity process parameters of each roller of a withdrawal and straightening machine, and the key technical scheme is as follows:

1) the temperature of the hot rolling raw material coil is controlled to be 42 +/-2.5 ℃, and the highest temperature cannot exceed 45 ℃;

2) the uncoiling speed of the hot rolling raw material coil is controlled to be 160 +/-5 m/min, and the minimum uncoiling speed can not be lower than 150 m/min;

3) the anti-wrinkling roller is tightly attached to the surface of the opened hot rolling raw material coil steel and gradually and automatically presses downwards along with the reduction of the outer diameter of the hot rolling raw material coil;

4) controlling a withdrawal and straightening machine: the parameter settings of the withdrawal and straightening unit for the thicknesses of different hot rolling raw material rolls are shown in table 1:

Technical Field

The invention relates to the technical field of metallurgical rolling, in particular to a method for controlling the transverse crease of a low-carbon steel hot-rolled pickled plate.

Background

The hot-rolled pickled plate is a product which takes a high-quality hot-rolled sheet as a raw material and has surface quality and use requirements between those of a hot-rolled plate and a cold-rolled plate, is an ideal substitute product for part of the hot-rolled plate and the cold-rolled plate, and is widely applied to the automobile industry and the household appliance industry. In recent years, with the increasing development of the automobile and the household electrical industry, the amount of the pickled plates used by users is gradually increased, and the requirements on the surface coating performance of the plate materials are also higher and higher.

In the metallurgical rolling process, the uncoiling and straightening processes of a hot rolling raw material coil belong to elastic-plastic bending deformation, and in the deformation process, due to the existence of a yield platform, when the plastic bending exceeds a critical value, the plastic deformation of strip steel is concentrated in a certain area, so that a strip-shaped deformation area is formed, namely a transverse crease mark defect is generated. The cross-crease defect has a large influence on the surface quality of the hot-rolled pickled plate, so that the contract delivery is influenced, and the user satisfaction is reduced. Taking a certain steel enterprise as an example, the product degradation rate caused by the transverse crease defect of the existing rolling method is not lower than 2% on average, and the product delivery and the economic benefit of enterprises are directly influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention solves the technical problem of providing the method for controlling the transverse crease mark of the low-carbon steel hot-rolled pickled plate, which can effectively prevent the probability of the transverse crease mark defect of the low-carbon steel hot-rolled pickled plate, improve the product quality, meet the supply requirement of customers and improve the economic benefit of enterprises by reasonably controlling the process parameters such as the temperature, the uncoiling speed, the position of a crease-resistant roller, the insertion amount of each roller of a withdrawal and straightening machine and the like of a hot-rolled raw material coil.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for controlling the transverse crease mark of a low-carbon steel hot-rolled pickled plate is characterized by comprising the following key technical scheme:

1) the temperature of the hot rolling raw material coil is controlled to be 42 +/-2.5 ℃, and the highest temperature cannot exceed 45 ℃;

2) the uncoiling speed of the hot rolling raw material coil is controlled to be 160 +/-5 m/min, and the minimum uncoiling speed can not be lower than 150 m/min;

3) the anti-wrinkling roller is tightly attached to the surface of the opened hot rolling raw material coil steel and gradually and automatically presses downwards along with the reduction of the outer diameter of the hot rolling raw material coil;

4) controlling a withdrawal and straightening machine: the reverse bending deformation of cooperation crease-resistance roller, the moving speed of hot rolling raw materials book in the straightening and withdrawal process should guarantee that the inlayer of hot rolling raw materials book panel, skin and the same deformation in intermediate level are even, and the parameter setting to the thickness straightening and withdrawal machine of different hot rolling raw materials book panel sees table 1:

compared with the prior art, the invention has the beneficial effects that:

1) by reasonably controlling the technological parameters such as the temperature, the uncoiling speed, the position of a crease-resistant roller, the parameters of a withdrawal and straightening machine and the like of the hot-rolled raw material coil, the purpose of controlling the low-carbon steel hot-rolled pickled plate to generate the transverse crease mark defect can be realized, and the product quality is improved;

2) the product percent of pass is greatly improved: taking a certain steel enterprise as an example, before the method is used, the product degradation rate caused by the transverse crease mark defect is not lower than 2% on average; after the method is used, the product degradation rate caused by the cross-crease defect is not higher than 0.1% on average;

3) the client supply requirement is met, and the client satisfaction is improved;

4) and the economic benefit of enterprises is improved.

Detailed Description

The following further illustrates embodiments of the invention:

the invention relates to a method for controlling the transverse crease mark of a low-carbon steel hot-rolled pickled plate, which can effectively prevent the probability of the low-carbon steel hot-rolled pickled plate generating the transverse crease mark defect by reasonably controlling the process parameters such as the temperature, the uncoiling speed, the position of a crease-resistant roller, the parameters of a withdrawal and straightening machine and the like of a supplied material hot-rolled raw material coil, and has the key technical scheme as follows:

1) temperature control of the hot rolling raw material coil: the temperature has certain influence on the strength performance of the steel, the yield strength of the steel is higher at normal temperature, but the yield strength of the steel is obviously reduced along with the increase of the temperature of the steel. Practice shows that when the temperature of the steel coil is higher than 45 ℃, the transverse crease defect is easy to generate by uncoiling. Therefore, the temperature of the incoming hot rolling raw material coil is strictly controlled to be below 45 ℃, and the optimal temperature interval is as follows: 42 +/-2.5 ℃ and cannot exceed 45 ℃ at most.

2) Controlling the uncoiling speed of the hot rolling raw material coil: the production of the transverse crease mark is a gradual change process, and practice shows that in order to reduce the production of the deformation process, the uncoiling speed is more than 150m/min, and the optimal uncoiling speed interval is as follows: 160 +/-5 m/min, and can not be lower than 150m/min at least.

3) Controlling the position of a crease-resist roller: the hot rolling raw material roll receives the combined action of two kinds of deformations of tensile and anti-bending in the process of opening a book, adopt crease-resistant roller pressure to make hot rolling raw material roll change its crooked direction in the moment of opening, in order to eliminate the bending of coiling the in-process, make the inlayer of hot rolling raw material roll board, the skin is the same with the intermediate level and warp evenly, so, the crease-resistant roller should paste the hot rolling raw material roll steel surface after tightly opening, and along with the reduction of hot rolling raw material roll external diameter and automatic pushing down gradually, prevent simultaneously when hot rolling raw material roll is opened up, shake down and take place local inhomogeneous deformation.

4) Controlling the withdrawal and straightening machine: the reverse bending deformation of the anti-wrinkling roll is matched, the moving speed of the hot rolling raw material roll in the pulling and straightening process ensures that the inner layer and the outer layer of the hot rolling raw material roll plate are uniformly deformed as the middle layer, and the parameters of the thickness pulling and straightening machine for different hot rolling raw material rolls are set as follows:

practice shows that by taking a certain steel enterprise as an example, before the method is used, the product degradation rate caused by transverse crease mark defects is not lower than 2% on average; after the invention is used, the product degradation rate caused by the cross mark defect is not higher than 0.1 percent on average.