Strip Pickling Efficiency on the Basis of Combined Parameters Optimization during Tension Leveling Process

doi:10.3901/JME.2019.02.051

Abstract

Abstract: In order to study the combined effect of tension and bending moments conditions on the acid pickling process of hot rolled strips, an elastic-plastic mechanics analysis method is conducted to analyze the influence of tension and bending moment on the curvature and elongation. Taking hot-rolled electrical steel sheet as an example, a mathematical model is established on the consideration of the relationship between curvature/elongation and tension/bending moment. Regarding the target values of curvatures and elongations, the relationship between tension and bending moment is established through the static equilibrium equations under various plastic bending stages. Electrochemical pickling experiments is also applied to investigate the effects of different curvatures and elongations on the acid pickling time, and to build a prediction model about the pickling time shortening rate with curvature/elongation. On the basis of pickling time shortening rate, the pickling efficiency is assessed with different curvatures and elongations. The saturation points of curvature and elongation during the process of pickling are 2.33 and 1.51%, respectively. The tension-bending moment regulatory domain is obtained, which treats the tension-bending moment relation curves as the left and right boundaries with different curvature and elongation values. The upper and lower boundaries are determined by the critical tension values under small tension and large bending moment conditions. The proposed regulatory domain provides a theoretical guidance for the configuration optimization of a tension leveling before the acid pickling process of hot rolled strips.

Key words: acid pickling, curvature, elongation, tension leveling, tension-bending moment regulatory domain

CLC Number:

TG142

ZHANG Zhaoning, ZHANG Jie, KONG Ning, LI Hongbo. Strip Pickling Efficiency on the Basis of Combined Parameters Optimization during Tension Leveling Process[J]. Journal of Mechanical Engineering, 2019, 55(2): 51-63.

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