飞秒激光旋切不锈钢微孔实验研究
发布时间：2018-08-13 19:39
【摘要】：为了解决飞秒激光高脉冲能量冲击打孔中时存在微裂纹等问题,提出了飞秒激光旋切加工方法。本文利用脉宽为120 fs的飞秒激光,选择0.5 mm厚度的304不锈钢进行旋切打孔实验。实验研究了激光旋切加工中离焦量和光楔的相对偏转角对孔直径的影响,以及激光离焦量对微孔锥度的影响。结果表明,随着离焦量的增大,孔径增大,同时锥度会减小后增加,当离焦量为0时,锥度最小为3.5°;微孔直径随之双光楔相对转角的增大而增大。此外实验发现冲击打孔孔壁出现微裂纹而旋切微孔的孔壁出现了纳米周期性条纹。
[Abstract]:In order to solve the problem of microcracks in high pulse energy impact drilling of femtosecond laser, a method of femtosecond laser rotary cutting is proposed. In this paper, a 120fs femtosecond laser with 0.5 mm thickness of 304 stainless steel was used to perform the rotary drilling experiment. The effects of defocusing amount and the relative deflection angle of the wedge on the hole diameter and the effect of laser defocusing on the micropore taper were studied experimentally. The results show that with the increase of the defocusing amount, the aperture increases and the taper decreases. When the defocus is 0, the taper minimum is 3.5 掳, and the micropore diameter increases with the increase of the relative rotation angle of the double wedge. In addition, it is found that there are microcracks in the percussion hole wall and nanometer periodic stripes in the hole wall of the rotated hole.
【作者单位】： 中南大学机电工程学院;中南大学高性能复杂制造国家重点实验室;
【基金】：国家973项目(No.2011CB013000) 国家自然科学基金项目(No.91323301,51475481,51475482) 教育部新世纪优秀人才支持计划(No.NCET-12-0548)资助
【分类号】：V263
本文编号：2181979
[Abstract]:In order to solve the problem of microcracks in high pulse energy impact drilling of femtosecond laser, a method of femtosecond laser rotary cutting is proposed. In this paper, a 120fs femtosecond laser with 0.5 mm thickness of 304 stainless steel was used to perform the rotary drilling experiment. The effects of defocusing amount and the relative deflection angle of the wedge on the hole diameter and the effect of laser defocusing on the micropore taper were studied experimentally. The results show that with the increase of the defocusing amount, the aperture increases and the taper decreases. When the defocus is 0, the taper minimum is 3.5 掳, and the micropore diameter increases with the increase of the relative rotation angle of the double wedge. In addition, it is found that there are microcracks in the percussion hole wall and nanometer periodic stripes in the hole wall of the rotated hole.
【作者单位】： 中南大学机电工程学院;中南大学高性能复杂制造国家重点实验室;
【基金】：国家973项目(No.2011CB013000) 国家自然科学基金项目(No.91323301,51475481,51475482) 教育部新世纪优秀人才支持计划(No.NCET-12-0548)资助
【分类号】：V263
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1 贾海妮;航空叶片异型气膜孔飞秒激光加工方法研究[D];中国科学院研究生院（西安光学精密机械研究所）;2013年
，本文编号：2181979
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