Inherent Characteristics Analysis of Simplified Model for Four High Hot Strip Mill with Gap
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摘要: 根据热连轧机实际结构, 采用集中质量法, 利用质量单元和弹簧单元表示辊系振动, 梁单元搭建机架轮廓, 建立了一种单架轧机简化模型, 可展现轧机空间振型, 在此基础上, 利用COMBIN40添加工作辊轴承座装配间隙, 考虑间隙对轧机系统固有特性的影响。通过模态分析发现, 间隙导致轧机系统低阶频率增多, 振动加剧。仿真结果与现场实测数据相对比, 验证了模型的可行性。Abstract: According to the actual structure of hot strip mill, a simplified model for single stand rolling mill is established by using lumped mass method, mass element and spring element to express roll system vibration, and beam element to build stand contour. Based on the above-mentioned, COMBIN40 is used to add the assembly clearance of roll bearing seat, and the influence of the clearance on the inherent characteristics of rolling mill system is considered. Through modal analysis, it is found that the gap leads to an increase in the low-order frequency and vibration of rolling mill system. The simulation results are compared with the field measured data to verify the feasibility of the model.
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Key words:
- hot continuous rolling /
- concentrated quality /
- beam unit frame /
- gap /
- modal analysis
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表 1 轧机质量-弹簧简化模型各等效质量和等效刚度
序号 ki/(N·m-1) mi/kg kix/(N·m-1) 1 3.5×1011 7.0×103 5.0×1010 2 2.9×1010 8.4×104 5.0×109 3 6.8×1010 2.1×104 5.0×109 4 2.8×109 1.3×103 5.0×109 5 2.8×109 2.1×104 5.0×109 6 6.9×1010 7.6×104 7.7×1010 7 6.4×1010 3.7×103 8 9.8×1011 
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表 2 轧机机架和工作辊截面参数
名称 截面形状 截面尺寸/mm 上梁 RECT 1 620×760 立柱 RECT 850×760 下梁 RECT 1 560×760 地脚 RECT 450×760 转角 TAPER 1 310×3 205、520×3 995 工作辊 CSOLID 800
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表 3 间隙模型与理想模型固有频率对比
阶数 固有频率/Hz 阶数 固有频率/Hz 有间隙 无间隙 有间隙 无间隙 1 10.363 10.376 11 54.110 61.882 2 10.410 10.420 12 55.232 61.975 3 26.877 26.877 13 61.975 61.975 4 26.877 26.877 14 61.975 63.479 5 31.103 31.249 15 73.057 75.784 6 31.249 31.249 16 75.344 76.123 7 31.249 42.624 17 76.123 76.123 8 32.386 43.127 18 76.123 76.661 9 42.756 53.199 19 79.513 91.213 10 43.861 54.104 20 87.782 92.870
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表 4 间隙模型5阶固有频率模态振型
频率/Hz 振型描述 31.103 工作辊系沿轧制方向上水平振动, 最大振幅出现在上工作辊, 机架弯曲变形 32.386 轧机两侧呈非对称振型, 工作辊系水平振动剧烈, 最大振幅出现在上工作辊, 机架弯曲变形 73.057 工作辊系水平振动剧烈, 最大振幅出现在上工作辊, 同时上、下工作辊具有反向垂直振动, 机架底部出现轻微变形 79.513 工作辊系水平振动剧烈, 最大振幅出现在下工作辊, 同时上、下工作辊具有反向垂直振动 87.782 轧机两侧呈非对称振型, 工作辊系水平振动剧烈, 最大振幅出现在上工作辊, 工作辊出现交叉现象
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表 5 两模型相近频率振型对比
间隙/Hz 理想/Hz 主要区别 42.756 42.624 间隙模型上工作辊水平振动较为严重, 并伴随轻微的垂直振动, 而理想模型上工作辊只出现了水平振动 43.861 43.127 间隙模型工作辊系水平振动较为严重, 最大振幅在工作辊, 并伴随轻微的垂直振动, 而理想模型最大振幅为机架上部的摆动 54.110 53.199 间隙模型上工作辊不仅表现为垂直振动, 还出现了水平振动, 而理想模型上工作辊仅表现为垂直振动 55.232 54.104 间隙模型工作辊不仅表现为垂直振动, 还出现了水平振动, 而理想模型工作辊仅表现为垂直振动 75.344 76.661 间隙模型上工作辊系水平振动较为严重, 最大振幅在上工作辊, 而理想模型最大振幅出现在机架下部
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