本文選題：皮秒激光打孔 + H59黃銅��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：黃銅作為一種電子元器件生產(chǎn)領(lǐng)域中常用的金屬,研究其微孔加工技術(shù)具有十分重要的工程應(yīng)用價(jià)值。與傳統(tǒng)的加工方法相比,黃銅激光打孔獲得的微孔深徑比更大、重鑄層更少、孔壁更光滑、表面更光潔、加工效率更高,因此研究激光參數(shù)對(duì)黃銅打孔的影響以及對(duì)參數(shù)進(jìn)行優(yōu)化顯得十分重要。本文從理論、試驗(yàn)以及數(shù)值模擬三個(gè)方面開展H59黃銅皮秒激光打孔工藝研究,通過控制變量法研究皮秒激光參數(shù)對(duì)微孔質(zhì)量的影響,并在此基礎(chǔ)上采用正交試驗(yàn)法獲得1 mm厚H59黃銅皮秒激光打孔的最優(yōu)加工參數(shù)。論文主要工作和進(jìn)展如下:(1)理論方面:介紹了激光與金屬材料的作用規(guī)律,分析了激光波長(zhǎng)、材料溫度、材料表面狀況以及材料性能對(duì)激光能量吸收的影響,闡明了長(zhǎng)脈沖激光和超短脈沖激光與金屬相互作用機(jī)理的區(qū)別。在此基礎(chǔ)上,利用一維雙溫模型中電子與晶格間的耦合理論闡述了皮秒激光與金屬銅的燒蝕機(jī)理。同時(shí)分析了皮秒激光系統(tǒng)對(duì)H59黃銅打孔過程中所采用的振鏡掃描加工原理。(2)試驗(yàn)方面:基于控制變量法研究了激光功率、重復(fù)頻率、元素次數(shù)和掃描速度等工藝參數(shù)對(duì)H59黃銅微孔質(zhì)量的影響規(guī)律,并以其試驗(yàn)研究結(jié)果為基礎(chǔ),考慮激光參數(shù)之間的交互影響,利用正交試驗(yàn)法優(yōu)化試驗(yàn)參數(shù),分析出對(duì)微孔質(zhì)量的影響程度從大到小依次為重復(fù)頻率、激光功率、掃描速度、元素次數(shù),最終得出最優(yōu)參數(shù)組合:激光功率49 W(70%),重復(fù)頻率0.7 MHz,元素次數(shù)300次,掃描速度500 mm/s,在此參數(shù)下獲得孔壁光滑、表面光潔、入口孔徑為243.572μm、出口孔徑為218.572μm、錐度為1.437°的高質(zhì)量微孔。(3)數(shù)值模擬:在激光打孔理論以及試驗(yàn)研究的基礎(chǔ)上,利用ANSYS中的APDL語言和單元生死技術(shù),結(jié)合試驗(yàn)中獲得的最優(yōu)參數(shù),對(duì)H59黃銅激光打孔過程中的溫度場(chǎng)變化及微孔孔徑變化進(jìn)行數(shù)值模擬。分析了在最優(yōu)參數(shù)下微孔的模擬結(jié)果與試驗(yàn)獲得的真實(shí)結(jié)果存在誤差的原因。
[Abstract]:As a common metal in the field of electronic components production, the study of the microporous processing technology of brass has very important engineering application value. Compared with traditional processing methods, brass laser drilling can obtain larger depth to diameter ratio of microhole, less recast layer, smoother hole wall, more smooth surface and higher processing efficiency. Therefore, it is very important to study the effect of laser parameters on the drilling of brass and optimize the parameters. In this paper, the H59 brass picosecond laser drilling process is studied from three aspects: theory, experiment and numerical simulation. The effect of picosecond laser parameters on the micropore quality is studied by controlling variable method. On this basis, the optimum processing parameters of 1 mm thick H59 brass picosecond laser drilling were obtained by orthogonal test. The main work and progress of this paper are as follows: the interaction between laser and metal material is introduced, and the influence of laser wavelength, material temperature, material surface condition and material properties on laser energy absorption is analyzed. The difference of interaction mechanism between long pulse laser and ultrashort pulse laser with metal is expounded. On this basis, the ablation mechanism of picosecond laser and copper is explained by the coupling theory between electron and lattice in one-dimensional two-temperature model. At the same time, the principle of vibroscope scanning in H59 brass drilling is analyzed in picosecond laser system. The laser power and repetition rate are studied based on the control variable method. The influence of technological parameters such as the number of elements and scanning speed on the micropore quality of H59 brass was studied. Based on the experimental results and considering the interaction between laser parameters, the orthogonal test method was used to optimize the experimental parameters. It is found that the order of influence on the quality of micropore is repetition rate, laser power, scanning speed, number of elements. Finally, the optimum parameters are obtained: laser power 49 W ~ (70), repetition rate 0.7 MHz, element number 300 times. The scanning speed is 500mm / s, and at this parameter, the hole wall is smooth, the surface is smooth, the inlet aperture is 243.572 渭 m, the outlet aperture is 218.572 渭 m, and the taper is 1.437 擄. The numerical simulation is based on the theoretical and experimental study of laser drilling. By using APDL language and element birth and death technique in ANSYS, the temperature field and pore size change during H59 brass laser drilling are numerically simulated in combination with the optimum parameters obtained in the experiment. The reasons for the error between the simulation results of micropores and the real results obtained by experiments under the optimal parameters are analyzed.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG146.11;TG665

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