Pass design method for producing seamless steel tubes by utilizing five-rack continuous rolling mill

Abstract

The invention discloses a pass design method for producing seamless tubes by utilizing a five-rack continuous rolling mill. The pass design method comprises the steps of determining the total diameter reduction rate of a continuous rolling mill set, and distributing diameter reduction rates of all racks; then, sequentially calculating pass parameters of each rack; calculating the diameter of a billet tube at the outlet end of each rack; calculating the distance from the pass axis of a roll at the roll outlet side of the continuous rolling mill to the bottom of a pass groove, the distance from the pass axis of a roll at the roll outlet side to the top of the pass groove and the arc radius of roll passes; calculating the ellipticity of each roll pass, calculating the length of each distribution curve, regulating and controlling the ellipticity of a second rack and a third rack within a 10% range, increasing by 1% every time, and finding out the length of the distribution curve with the smallest ellipticity; changing the position of a contact point, which is in contact with the billet tube, of the roll in a rolling deformation area, changing the position within a + / -15% range, increasing by 1% every time, calculating a group of contact arc length values, and obtaining a minimum value of a contact arc length differential value; calculating a longitudinal-horizontal flowing speed ratio of metal deformation of the billet tube. According to the method disclosed by the invention, the mechanical performance of products can be ensured.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a pass design method for producing seamless steel pipes using a seven-stand continuous rolling mill. Background technique [0002] Seamless steel pipe is a kind of economic cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, and is widely used as a pipeline for transporting fluids such as oil, natural gas, gas and water. With the development of science and technology, the user's requirements for the quality of seamless steel pipes are constantly improving. The mechanical properties and shape error control of seamless steel pipes have become the main indicators for measuring product quality, which prompts enterprises to continue to pay attention to the mechanical properties and shape errors of products. Develop advanced production equipment and technology. [0003] In the production process of seamless steel pipes, the roll...

AI Technical Summary

Problems solved by technology

[0005] It is obvious that it is difficult to obtain the optimized result by empirically designing the roll pass; the calculation amount of the computer optimization design method is large, and the metal flow velocity is not considered, so the mechanical properties, geometric dimensions and residual stress of the pipe are affected.

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