从固态金属感应加热熔化和液态金属电磁成形两个角度出发,讨论了金属熔体双频电磁成形中的频率选择,物理量的分布以及两种双频电磁成形的试验过程.结果表明:小尺寸复杂形状金属熔体电磁成形的最佳频率约在超音频的范围(f=10～100kHz),双频电磁力等物理量的分布是相应单频电磁力等物理量和与频率相关的三角函数的组合,在一定条件下,可简化为两个单频物理量的叠加.试验中成功地实现了双高频和高频-超音频两种双频电磁成形过程,高频-超音频双频电磁成形的工艺要优于双高频电磁成形的工艺,最后利用优化的双频电磁成形方案成功地实现了扁椭圆、弯月截面等复杂形状金属熔体双频电磁成形过程,获得了无模壳双频电磁成形的复杂截面形状样件.
参考文献
| [1] | Muck O .[P].GermanPatent 422004,1923. |
| [2] | Okress E C et al.Electromagnetic levitation of solid and molten metals[J].Journal of Applied Physics,1952,23(05):525. |
| [3] | Getselv Z N .Casting in an electromagnetic field[J].Journal of Metals,1971,23(10):38. |
| [4] | Li B Q;Evans J W;Cook D P .An improved mathematical model for electromagnetic casters and testing by a physical model[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1991,21:121. |
| [5] | Vives C;Ricou R .Experimental study of continuous electromagnetic casting of aluminum alloys[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1985,16:377. |
| [6] | 沈军,陈光,李建国.板状坯件的电磁约束成形[C].材料研究与应用新进展(下卷)（1998年中国材料研讨会：论文专辑）,1998:939～942. |
| [7] | Lavers J D .Computational methods for the analysis of molten metal electromagnetic confinement systems[J].ISIJ International,1989,29(12):993. |
| [8] | 李双明 .金属熔体的双频电磁成形过程研究[D].西安:西北工业大学,1999. |
| [9] | Sneyd A D;Moffatt H K .The fluid dynamics of the levitation melting process[J].Journal of Fluid Mechanics,1982,117(01):45. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%