Production method of transverse wedge-shaped rolled thickness-variable steel plate

Abstract

The invention discloses a production method of a transverse wedge-shaped rolled thickness-variable steel plate, belongs to the technical field of rolling, and provides the production method of the transverse wedge-shaped rolled thickness-variable steel plate by employing a thickness-variable steel plate in a transverse wedge-shaped rolling mode. The production method is high in yield and high in production efficiency. The production method comprises the following steps: step 1, transversely rolling, namely, carrying out longitudinal cross section-variable rolling on the steel plate according to average thickness set values of the head part and the tail part of the steel plate in the last rolling in the transverse rolling period; and step 2, longitudinally rolling, namely, firstly, in the longitudinal rolling period, carrying out transverse equal-proportion wedge-shaped rolling according to head-tail longitudinal thickness-variable values generated in the transverse rolling period, and secondly setting roller seam adjustment amount and roll bending force set values by employing an influence function method according to rolling schedule distribution, and ensuring that the transverse thickness distribution in the longitudinal rolling meets the equal-proportion wedge-shaped requirements.

Description

Technical field [0001] The invention belongs to the technical field of rolling, and particularly relates to a production method for transverse wedge rolling of variable thickness steel plates. Background technique [0002] Variable thickness plate is an important raw material for bridge and shipbuilding production. It has outstanding advantages such as reducing the number of welding, eliminating the need for mechanical processing at welded joints, and reducing structural quality, and has obvious economic benefits. At present, the production methods of wedge plates at home and abroad focus on longitudinal variable cross-section, also known as LP (Longitudinal Profiled) steel plates. The hydraulic system is used to continuously change the opening degree of the rolls during the several passes of the final rolling to realize the longitudinal direction of the steel plate. The thickness of the steel plate changes continuously, and the typical production method of the existing longitudi...

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Problems solved by technology

[0003] There are disadvantages such as low yield and low production efficiency in the production of variable-thickness steel plates by the method of longitudinally variable cross-section, and it is difficult to produce continuously in large quantities. The specific disadvantages are as follows:

[0004] 1) The rolling process of the wedge-shaped plate should take into account the response speed of the hydraulic system, the size of the wedge shape of the variable-thickness steel plate, and the accuracy of the position tracking of the horizontal rolling piece. It is difficult to increase the horizontal rolling speed, and low-speed rolling leads to extremely low rolling efficiency;

[0005] 2) The low-level rolling speed also causes the temperature drop of the hot-rolled steel plate to be too fast, making it difficult to produce thin wedge-shaped plates;

[0006] 3) When rolling longitudinally variable-thickness steel plates, in order to ensure control accuracy, a certain stable section must be left at the junction of multiple wedge-shaped plates. At the same time, the total length of a steel plate cannot be an integral multiple of multiple wedge-shaped plates, resulting in The waste of steel plates reduces the yield of products

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