The design of control circuit for electromagnetic force assisted line heating device

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Electrical Engineering and Automation (EEA) September 2013, Volume 2, Issue 3, PP.31-37

The Design of Control Circuit for Electromagnetic Force Assisted Line Heating Device Qiang Liu 1, Ji Wang 1#, Yujun Liu 1, Lijun Zhang 2 1. State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024, China 2. Technical Center, Cosco Shipyard Group Co., Ltd, Dalian 116600, China #Email: wangji@dlut.edu.cn

Abstract In the process of line heating, a certain frequency and approximatively consecutive force of constraint can be applied to steel plates by using pulsed electromagnetic force. It can not only improve the condition of steel plates heated at high temperatures, improve the efficiency of steel forming but also be conducive to the process control and improvement of the forming accuracy. According to the actual needs of electromagnetic force assisted line heating process, the control circuit design ideas of the electromagnetic force assisted line heating device and the function of its branch circuits are introduced. After using a digital oscilloscope and 5v, 12V, 20V power to detect and analyze signal output of the material object of circuit, the results verify the correctness of the design of circuit. Keywords: Line Heating; Electromagnetic Force Aid; Circuit Design

电磁力辅助水火弯板工艺装置控制电路设计* 刘强 1,汪骥 1,刘玉君 1,张利军 2 1. 大连理工大学 工业装备结构分析国家重点实验室,辽宁 大连 116024 2. 中远船务工程集团有限公司技术中心,辽宁 大连 116600 摘

要:在水火弯板过程中利用脉冲电磁力可以对钢板施加一定频率、近似为连续的约束力,不仅能够改善钢板高温加

热条件,提高钢板成形效率,而且有利于加工控制和提高成形精度。根据电磁力辅助水火弯板的实际需求,介绍了电磁 力辅助水火弯板控制电路的设计思路和各分支电路的功能,并利用数字示波器和 5V、12V 和 20v 电源对设计电路实物进 行了信号输出检测和分析,结果验证了电路设计的正确性。 关键词:水火弯板;电磁力辅助;电路设计

引言 水火弯板工艺(即线加热无模成形工艺)是目前船体大型复杂曲面钢板主要成形加工方式,具有适用范 围广、成本低廉、操作灵活及适于各种复杂曲面形状的成形加工等优点,在日本、韩国等造船技术先进国家, 对该项工艺研究一直投入大量基金进行研究[1, 2],通过研究不同热源形式下钢板的变形机理,得到变形规律, 在此基础上研究工艺参数的预报方法和自动化加工设备[3-5]。但是,传统水火弯板工艺主要利用钢板局部加热 和冷却过程中内部产生的热应力来实现弯曲变形,变形影响因素多,成形规律难以掌握,加工精度难以控制。 此外,在加热温度较高的情况下容易导致钢板材质改变甚至产生裂纹。 *基金资助:受国家自然科学基金资助项目支持资助(51009025) 。

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