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摘要毫秒激光打孔中，小孔易出现堵塞等现象，利用纳秒激光产生的等离子冲击波来促进熔融物质迁移。本文研究了冲击波对物质迁移的作用机理。通过分别研究水和不同粘度液体中使用激光轰击小孔产生等离子体冲击波对小孔内物质迁移的影响，得出激光能量、液体粘度、孔深与物质迁移率之间的相互关系，并通过计算得出模拟液态铝合适的液体粘度。结果表明激光能量增加，则迁移率增加；孔深增加，则迁移率减小；液体粘度增加，总趋势上迁移率减小。本文的研究结果有助于激光致等离子体冲击波对小孔内物质迁移情况的进一步研究。34037
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关键词 激光打孔 等离子体冲击波 物质迁移
毕业论文设计说明书外文摘要
Title The Mechanism Research of the Effect of the Plasma Stock Wave Caused by Laser on the Matter Migration in the Holes
Abstract
In millisecond laser drilling,holes are easily being blocked up, the plasma stock wave produced by the nanosecond laser is being used to promote the transformation of molten material.The mechanism of the shock wave about material migration is being studied in this thesis.Through experiments of laser processing under different conditions ,getting the relationship between laser energy,viscosity, holes depth with the matter migration rate,and working out the proper viscosity of liquids to imitate the molten aluminum by computation. The results show thatwith laser energy increasing,the migration increases;with hole depth increasing,the migration reduces;with liquid viscosity increasing,the migration reduces on the general trend.These results contributes to the further study on the impact of the plasma stock wave caused by laser on the matter migration during laser processing.
Keywords laser drilling plasma stock wave matter migration
目 次
1 引言 1
1.1 研究背景 1
1.2 毫秒激光打孔与纳秒激光加工 1
1.2.1 毫秒激光打孔过程 1
1.2.2 纳秒激光加工 3
1.3 激光与物质相互作用 4
1.3.1 短脉冲激光与物质作用形成等离子体原理 4
1.3.2 激光与物质作用时的反冲压力 5
1.3.3 等离子体冲击波机制 6
1.4 本文的主要工作 6
2 激光致等离子体冲击波对小孔内物质迁移率的影响 8
2.1 液态铝的模拟机理 8
2.2 实验过程 9
2.2.1 铝材小孔预制 9
2.2.2 液体粘度的调制 10
2.2.3 表面张力的测量 11
2.2.4 实验光路 12
2.2.5 等离子体冲击波对水介质的迁移作用实验 12
2.2.6 等离子体冲击波对不同粘度液体介质的迁移作用实验 16
3 小孔内物质迁移率的实验结果分析 19
3.1 等离子体冲击波对介质的迁移作用中激光能量的影响 19
3.2 等离子体冲击波对介质的迁移作用中孔深的影响 20
3.3 等离子体冲击波对介质的迁移作用中液体粘度的影响 21
结 论 24
致 谢 25