Method for on-line drafting elastic curve of rolling mill

Abstract

The invention discloses a method of on-line drawing an elastic curve for rolling mills. Based on the principle of the known pressing process, the method utilizes the pressing process to measure relative data of roll-gap spring rate and rolling force, collects the data measured on-line in real time to store in a digital control system PLC, utilizes the tracing point method to analog an elastic curve of a rolling mill in the digital control system PLC, and then operates stiffness coefficient and spring rate of the rolling mill under any roll-force through a piecewise linear method by aid of the elastic curve of the rolling mill. The method of on-line drawing an elastic curve for rolling mills not only finish the conventional pressing return-to-zero work, but can fast on-line analog the elastic curve of the rolling mill and precisely compensate the spring rate of the rolling mill in real time, thereby overcoming the defects of poor precision and low efficiency of the known pressing process.

Description

Technical field: [0001] The invention relates to an automatic control technology for the thickness of a steel plate in the metallurgical industry, in particular to a method for drawing an elastic curve of a rolling mill online. Background technique: [0002] In the production process of cold rolled strip in the metallurgical industry, the thickness of the rolled strip can be controlled by changing the gap between the rolls. Assuming that the rolling mill stand and roll system have infinite rigidity, the thickness of the strip exit will be equal to the roll gap set at no-load. But in fact, the stand and the roll system not only have limited rigidity, but there are also gaps between the roll systems, so the elastic deformation of the rolling mill is a variable amount under the action of different rolling forces. In order to obtain a high-precision strip, it is necessary to accurately calculate the elastic deformation of the rolling mill to eliminate the influence of the frame bounc...

AI Technical Summary

Problems solved by technology

[0006] Obviously, although the above method is simple, it needs to calculate the rolling mill rigidity coefficient off-line and idealize it as a constant, which undoubtedly reduces the control accuracy; And guarantee the requirements of work efficiency