Thermal-Force Bulging Behavior and Efficient Control Method of Electromagnetic Control Roll

doi:10.12068/j.issn.1005-3026.2024.05.007

Abstract

Abstract:

To study the thermal‐force bulging behavior of roll profile electromagnetic control technology （RPECT）， the variation laws of the comprehensive roll crown， the thermal‐force contribution roll crown and the ratio of the force crown with the heat of contact zone under different current densities and frequencies were analyzed by finite element method， and the mapping relationship and establishment condition between the heat of contact zone and the thermal‐force bulging ability were explored.The results show that， within the range of the middle and low values of the heat of contact zone， the thermal‐force control ability corresponding to the same value of the heat of contact zone cannot be affected by the magnetic parameters.Therefore， an efficient control strategy of RPECT can be proposed， which takes the heat of contact zone as the bridge value between the input parameter and the control ability.The strategy can quickly achieve the target temperature rise effect of the contact zone by increasing the magnetic parameters， and then obtain the target control ability.Taking the roll gap crown requirement of 20 μm as an example， the comparison between the original and the efficient control strategy shows that the control time of the new strategy can be effectively shortened to 19.57% of the original control time.

Key words: roll profile electromagnetic control technology, thermal‐force bulging behavior, heat of the contact zone, control ability, efficient control strategy

CLC Number:

TG 156

Ting-song YANG, Dun-liang HUANG, Wen-quan SUN, An-rui HE. Thermal-Force Bulging Behavior and Efficient Control Method of Electromagnetic Control Roll[J]. Journal of Northeastern University(Natural Science), 2024, 45(5): 660-667.

Figures/Tables 13

Fig.1 Technical principle schematic of RPECT

Fig.2 Simulation model of roll profile electromagnetic control and local refinement

Table 1 Model parameters of roll profile electromagnetic control

参数	取值	参数	取值
轧辊直径/mm	270	辊身长度/mm	300
轧辊内孔直径/mm	100	ES接触区直径/mm	100
ES接触区长度/mm	100	ES感应直径/mm	50
ES感应区长度/mm	50	ES边部区直径/mm	98
初始温度/℃	26	IC断面面积/mm²	169
电流密度/（A·mm^-2）	3~6	电流密度基础值/（A·mm^-2）	5
电流频率/Hz	50~800	电流频率基础值/Hz	400

Fig.3 Roll profile electromagnetic control experiment platform

Fig.4 Results of model verification

Fig.5 Variation of Qc and C under differentelectromagnetic parameters

Fig.6 Variation of thermal?force bulging abilitywith changing Qc under differentelectromagnetic parameters

Fig.7 Variation of ηf with changing Qc under differentcurrent densities or frequencies

Fig.8 Temperature distribution of ES under different working conditions when the heat of the contact zone is 100 kJ

Fig.9 Temperature distribution of ES and ECR under different current density when the heat of the contact zone is 300 kJ

Fig.10 Thermal‐force bulging control strategy of RPECT when the target value of roll crown is 10 μm

Fig.11 Thermal-force bulging ability of the original and efficient control strategies

Fig.12 Temperature distribution of ES and ECR of the original and efficient control strategies

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