【摘要】：為了解決飛秒激光高脈沖能量沖擊打孔中時(shí)存在微裂紋等問題,提出了飛秒激光旋切加工方法。本文利用脈寬為120 fs的飛秒激光,選擇0.5 mm厚度的304不銹鋼進(jìn)行旋切打孔實(shí)驗(yàn)。實(shí)驗(yàn)研究了激光旋切加工中離焦量和光楔的相對(duì)偏轉(zhuǎn)角對(duì)孔直徑的影響,以及激光離焦量對(duì)微孔錐度的影響。結(jié)果表明,隨著離焦量的增大,孔徑增大,同時(shí)錐度會(huì)減小后增加,當(dāng)離焦量為0時(shí),錐度最小為3.5°;微孔直徑隨之雙光楔相對(duì)轉(zhuǎn)角的增大而增大。此外實(shí)驗(yàn)發(fā)現(xiàn)沖擊打孔孔壁出現(xiàn)微裂紋而旋切微孔的孔壁出現(xiàn)了納米周期性條紋。
[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 擄, 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.
【作者單位】： 中南大學(xué)機(jī)電工程學(xué)院;中南大學(xué)高性能復(fù)雜制造國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家973項(xiàng)目(No.2011CB013000) 國家自然科學(xué)基金項(xiàng)目(No.91323301,51475481,51475482) 教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃(No.NCET-12-0548)資助
【分類號(hào)】：V263

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