(1.武漢汽車工業(yè)大學(xué)材料科學(xué)與工程學(xué)院，武漢 430070;
2.哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院， 哈爾濱 150006)
摘 要: 用平面螺旋和多疊式線圈加工平板毛坯是電磁成形的一種基本方式， 其理論研究包括電路分析和動態(tài)變形分析兩個方面，其中電路分析的目的是確定作用在工件上的脈沖電磁力，并用于變形分析。 通過分析板坯電磁成形中工作線圈在強(qiáng)脈沖電流激勵下的動態(tài)響應(yīng)過程， 建立了線圈磁場、 工件表面感應(yīng)渦流及磁場的計算公式， 給出了成形載荷的計算方法。通過數(shù)值分析討論了載荷的分布特性，數(shù)值求解結(jié)果與相關(guān)實驗研究結(jié)論一致。 將成形載荷數(shù)值求解結(jié)果用于變形分析時， 成功地預(yù)測了鋁板毛坯的自由脹形過程。
關(guān)鍵字: 關(guān)鍵詞: 板坯 電磁成形 載荷
（1.School of Materials Science and Engineering,Wuhan Automotive Polytechnic University, Wuhan 430070, P. R. China
2.School of Materials science and Engineering,Harbin Institute of Technology, Harbin 150006, P. R. China）
Abstract:To form flat workpiece by the flat spiral coil or conical coil is a typical method of magnetic forming. The analysis of the forming processes consists of the analysis of the electric circuit and the dynamic deformation of the workpiece. The purpose of the electric circuit analysis is to calculate the impulsive magnetic pressure and to apply it to the deformation analysis. By analysing the dynamic response of the coil-workpiece system while the workin g coil being stimulated by intentive impulsive current, the formulas calculating magnetic intensity induced by coil, whirling current on workpiece and its magnetic intensity have been established. And the method for determination of forming load has been given. Then, some characteristic curves of forming load have been obtained to describe its distribution. The computation results are consistent with the conclusion obtained from some relative experiments. Finally, by applyin g the calculating results of forming load to the deformation analysis, the free magnetic bulging process of sheet aluminium have been predicted successfully.
Key words: flat workpiece magnetic forming forming load
