Waveform evolution mechanism of whole roller flatness meter
ZHANG Tongyuan1, YU Huaxin1,2, LIAO Shuang1, YANG Sheng1, LIU Hongmin1,2
1. National Engineering Research Center for Equipment and Technology of Cold Rolling Strip, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
Abstract：It is found in the test debugging and industrial application of the whole roller flatness meter that under the condition of large wrapping angle and large tension, the sensor inside will output the double peak waveform signal which is obviously different from the conventional single peak waveform signal. When the flatness meter is installed at variable wrapping angle condition, there is a transition from single peak waveform to double peak waveform and there is even a coexistence of single and double peak waveform in different detection channels. Since the shape of the double peak waveform is obviously different from that of the single peak one, obvious flatness detection error will be generated if the waveform signal is processed by conventional signal processing method. In order to study the cause and law of waveform evolution, a four rolls model of variable tension and variable wrapping angle was designed and applied to the finite element simulation. The results show that large tension and large wrapping angle are the main factors affecting the double peak waveform in the output signal of the flatness meter. The single peak waveform will gradually evolve into the double peak waveform with the increase of wrapping angle under certain conditions of tension and the single peak waveform will gradually evolve into double peak waveform with the increase of tension under the condition of specific wrapping angle. In order to further study the evolution mechanism of the waveform, the tension fixed on the single channel of the detection roll and it was simulated under the 20°, 30° and 40° wrapping angles, respectively. The displacement changes of the top and two sides of the sensor mounting holes were extracted, and the displacement changes of the top surface of the sensor corresponding to the relative position of the strip and the roll body were obtained. It is found that the profile of the mounting hole of the sensor will produce irregular micro-deformation under large tension and large wrapping angle, which changes the stress state and displacement trend of the sensor, resulting in the evolution of single and double peak waveform signals. By setting up a experimental platform, the constant tension variable wrapping angle test and constant wrapping angle variable tension test were carried out. The evolution law of the simulation waveform curve was restored and the correctness of the results was verified. Finally, the reasons for the difference between the simulated waveform curve and the actual waveform curve are analyzed, and specific suggestions are given on how to avoid the influence of double peak waveform on the detection of the whole roller flatness meter.
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2023, Vol. 58 
