Compensation method of seamless steel pipe three-roll mill

Abstract

The invention belongs to the technical field of forming and particularly relates to a compensation method of seamless steel pipe three-roll mill. The method comprises: 1, an equation of an elastic curve: T(x)=sigma ciphii; 2, a three-roll centering compensation method; 3, disturbance influence reduction method; and 4, elastic deformation compensation input adjustment method. The compensation method of the invention solves an elastic deformation problem of a seamless steel pipe three-roll mill and takes the characteristics and the influences of smooth adjustment into consideration. Simply, a smooth curve approximation mode of elastic deformation compensation can be used in three-roll mills and also can be used in production processes of other various mills, such as other hot rolling processes, cold rolling processes and the like.

Description

technical field [0001] The invention belongs to the technical field of forming, and in particular relates to a compensation method for three-roll continuous rolling of seamless steel pipes. Background technique [0002] In the current steel rolling process, the elastic deformation compensation method generally adopted for the rolling requirements in the roll gap control is not very suitable for the pipe rolling process, especially for the three-roll mill used in the production of seamless steel pipes. The size of the roll gap is related. During the rolling process, due to the effect of rolling pressure, the working stand (roll and its bearings, pressing device and frame, etc.) of the rolling mill produces a certain amount of elastic deformation, and the total deformation of the working stand is very large. The elastic deformation of the stand will affect the roll gap and pass shape of the roll, thereby affecting the precision of the rolled product. While moving, it is nece...

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Problems solved by technology

Aside from the process, as far as the compensation method is concerned, the disadvantage of the first method is that it is very inaccurate to use a straight line to approximate the inherent bounce curve of the rolling mill in a segmented form, and it needs a considerable number of sampling points to approximate , to ensure accuracy; the disadvantage of the second method is that the formation of such a huge database requires long-term accumulation and maintenance, and the investment is too large, which is not worth the candle

In this way, when the rolling force fluctuates seriously during the rolling process, the instantaneous fluctuation of the compensation value will be very large, and it is easy to increase the vibration due to frequent adjustment

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