Rigidity testing method based on TDC (technical dynamic controller)

Abstract

The invention discloses a rigidity testing method based on a TDC (technical dynamic controller). The rigidity testing method comprises the following steps of 1, initially placing the position of a screwdown system; when the pressure of the initial position placing reaches the standard, executing the next step; when the pressure of the initial position placing does not reach the standard, stopping the rigidity testing; 2, enabling the screwdown system to sequentially trigger pressure rings, and giving out the target pressure value; if each pressure ring meets the three conditions, namely that the pressure rings sequentially reach the corresponding target value, each target value meets the pressure difference requirement and each pressure ring is in a rigidity experiment mode, completing the screwdown testing, and executing the next step; if each pressure ring fails to meet the three conditions, stopping the rigidity testing; 3, enabling a control system to give a lifting target pressure value, enabling the screwdown system to sequentially trigger each pressure value, and lifting each pressure ring up to the setting pressure value; once the pressure is lifted up to the setting pressure value, placing the position of a roller gap to the setting value. The rigidity testing method has the characteristics that the rigidity of a rolling machine is quickly measured, and the accuracy and traceability of data are realized; the rigidity testing method can be applied to the technical field of steel rolling.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a stiffness testing method based on TDC (Technical Dynamic Controller, process dynamic controller (a control system developed by Siemens)). Background technique [0002] During rolling, due to the effect of rolling force, the working seat of the rolling mill will produce a certain elastic deformation, which has a great influence on the adjustment of the rolling mill and the dimensional accuracy of the strip. Before the rolled piece enters the roll, the original roll gap of the roll is set to S 0 , when rolling the piece, under the action of the rolling force P, the elastic deformation of the stand at the middle of the roll body is f, if the original roll shape of the roll is cylindrical, the section of the rolled piece will be a drum shape, and the thickness of the rolled piece is also greater than S 0 ,Right now [0003] h=S 0 +f [0004] In the formula, h is the thic...

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Problems solved by technology

[0019] Such drastic roll gap adjustment will not only deteriorate the thickness control accuracy, but also have an adverse effect on the stability of the looper ( Figure 5 The value used for the stiffness of the F5 rolling mill, Image 6 "LP3_HeightFbk" is the height feedback of No. 3 looper, "LP4_HeightFbk" is the height feedback of No. 4 looper, "LP5_HeightFbk" is the height feedback of No. 5 looper, "LP6_HeightFbk" is the height feedback of No. 6 looper)

[0020] Through the comparison, it can be seen that the No. 5 looper has a high-frequency oscillation at the end of the rolling process. It can be seen that the inaccurate stiffness value originally used directly affects the rolling stability and thickness control accuracy.

[0021] Stiffness is an important physical parameter of a hot rolling mill. The accuracy of its data directly affects the setting accuracy of the entire rolling model, rolling stability, and thickness accuracy. The unevenness of the side leads to the deviation of the strip and the scrap steel. At the same time, the stiffness value used in the existing AGC control method is obtained by the look-up table method. The jump in the stiffness value that changes with the rolling force during the rolling process greatly affects the AGC. The accuracy of the control model makes it difficult to improve the accuracy of strip thickness

For this reason, the industry tries to use the manual stiffness experiment test. The operator manually presses down and lifts up the system to reach the target pressure value, and then stops at a certain rolling force for 3 seconds after it is in place. The disadvantage of this method is that due to the precision There are multiple racks in the rolling production line, so it takes too long to test one time, and subjectively, operators have different understandings of lifting pressure in place, and there is a high possibility of artificially causing deviations in test results, which cannot provide accurate and traceable information for steel rolling production. The data

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