Roll groove design method for seamless steel pipe stretch reducing machine set

Abstract

The invention discloses a roll groove design method for a seamless steel pipe stretch reducing machine set, which can reduce difficulty in optimal design and satisfy needs for product pipe profile and wall thickness control, and comprises the following steps: 1, collecting equipment parameters and variety specification ranges of a seamless steel pipe stretch reducing machine set; 2, selecting products of steel pipe representative specifications and determining the weighting coefficient of every specification; 3, setting a groove curve equation(Y=a0+a1*2+a2*4+,..., +an*2n) by using a0, a1, a2,..., and an as the groove curve parameters of the machine frames of the seamless steel pipe stretch reducing machine set; 4, setting a target function for optimizing groove curves, and determining the optimal values of the groove curve parameters by using an optimal design method; and 5, substituting the optimal values of the groove curve parameters into the groove curve function to obtain the required groove curves of every machine frame of the seamless steel pipe stretch reducing machine set. When the method of the invention is used, the optimization process of the groove design can be simplified, and the designed groove can meet the pipe profile requirements of products and has uniform wall thickness.

Description

technical field [0001] The invention relates to the field of rolling seamless steel pipes, in particular to a design method for roll passes of a tension reducing unit for seamless steel pipes. Background technique [0002] The production of seamless steel pipes usually includes three processes of piercing, rolling and diameter reduction. At present, the piercing process usually uses a two-roll cross rolling process to roll the solid billet into a hollow billet. The rolling process usually rolls the pierced billet into a certain outer diameter and Steel pipes with thicker walls, while the diameter reduction process rolls the steel pipes after five-stand continuous rolling into finished steel pipes that meet the product diameter and wall thickness requirements. [0003] At present, in order to obtain seamless steel pipes with smaller diameters, the steel pipes with larger diameters are usually reduced into finished steel pipes with smaller diameters by using a tension reducti...

AI Technical Summary

Problems solved by technology

Therefore, when designing the roll pass of the seamless steel pipe tension reducing unit composed of multiple arcs, there are many unknown variables that need to be determined. One arc needs 3 variables, and three arcs need 9 variables. bring great difficulty

At the same time, the pass curve composed of multiple arcs is intersecting and connected, and the transition of the pass curve is not smooth, which will inevitably affect the quality of the outer surface of the product

[0006] In addition, the optimization goal of the traditional seamless steel pipe tension reducing unit pass design method is generally to consider only the best pipe shape for thin-walled pipes, and the most uniform wall thickness for thick-walled pipes

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