Pipe shape control method for rolling seamless steel pipe by using seven-frame tandem mill

Abstract

The invention discloses a pipe shape control method for rolling a seamless steel pipe by using a seven-frame tandem mill, which aims to provide a control method for processing data by using on-line detection pipe shape information and controlling rolling parameters in real time by integrating thickness errors, ellipticity errors and straightness errors which influence pipe shapes so as to ensure the accuracy of the pipe shapes. The method comprises the following steps of: 1) presetting the rolling parameters; 2) calculating rolling reduction and rolling force according to actually-measured wall thickness, ellipticity and straightness, namely making the rolling reduction, the wall thickness errors, the ellipticity errors and the straightness errors form a matrix, simplifying the matrix to be a corresponding relationship between the rolling reduction and a single parameter by an elimination method, calculating the rolling reduction caused by the wall thickness errors, the rolling reduction caused by the ellipticity errors and the rolling reduction caused by the straightness errors respectively, and calculating the rolling force by using the sum of the calculated rolling reduction caused by the wall thickness errors, the ellipticity errors and the straightness errors; and 3) modifying the rolling force and roller gap numerical values in real time in the rolling process.

Description

technical field [0001] The invention relates to a method for controlling the shape of a seamless steel pipe. Background technique [0002] Seamless steel pipes are mainly used in energy development, transportation, mechanical structure, chemical equipment and other fields. With the development of the world economy and production technology, the quality requirements of seamless steel pipes in petroleum and boiler industries have been continuously improved, and the control of pipe shape error has become one of the core technologies of seamless steel pipe production. The tube shape of the seamless steel tube is an important control index in the steel tube rolling production. It refers to the thickness difference, straightness error and ellipticity of the steel tube at different positions. The error of the roll, the error of the roll, the change of the rolling tension, the contact state of the roll, the thermal deformation of the roll, the change of the roll gap, etc., these pa...

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Problems solved by technology

However, due to the interference between each error parameter, it affects the control accuracy

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