本文關(guān)鍵詞：激光輔助微銑削中銑削力及其與刀尖圓弧半徑的關(guān)系研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 激光輔助微銑削 銑削力 有限元 刀尖圓弧半徑

【摘要】：Ti6Al4V在航空航天行業(yè)中有廣泛應(yīng)用,可制作成慣性導(dǎo)航元件及各種精密儀表中的零件,但其可加工性較差,加工過程中切削力大,刀具易磨損。激光輔助微銑削為這類難加工材料提供了一種有效、可行的加工方法,能夠有效降低銑削力,減緩刀具磨損。本文從理論模型建立、有限元仿真、實(shí)驗(yàn)研究三個(gè)方面對激光輔助微銑削中銑削力進(jìn)行研究,并以刀尖圓弧半徑為指標(biāo)評價(jià)刀具磨損,對激光輔助微銑削過程中刀具磨損情況進(jìn)行研究。并在此基礎(chǔ)上對切削力與刀具磨損二者之間關(guān)系進(jìn)行研究。本文首先以經(jīng)典銑削力模型為基礎(chǔ),建立傳統(tǒng)微銑削過程中的銑削力力學(xué)模型,在此基礎(chǔ)上,結(jié)合溫度場對被加工材料力學(xué)屬性的改變以及刀具刀尖圓弧半徑的影響建立激光輔助微銑削過程中銑削力的數(shù)學(xué)模型。在激光輔助微銑削中銑削力仿真方面,本文利用有限元仿真軟件ABAQUS對激光輔助微銑削中銑削力進(jìn)行仿真。研究中首先對不同預(yù)熱溫度下的材料應(yīng)力進(jìn)行三維仿真。之后對激光掃描進(jìn)行仿真。仿真結(jié)果表明在很小范圍內(nèi)溫度變化很小,因此本文采用穩(wěn)態(tài)溫度場對刀尖切削處非穩(wěn)態(tài)溫度場進(jìn)行簡化,最后將溫度場仿真結(jié)果與三維銑削模型進(jìn)行結(jié)合,進(jìn)而得到激光輔助微銑削三維模型,并輸出仿真結(jié)果,將激光輔助微銑削中銑削力與常規(guī)微銑削相比較。實(shí)驗(yàn)方面,本文首先分別進(jìn)行常規(guī)微銑削和激光輔助微銑削兩組實(shí)驗(yàn),對不同參數(shù)下銑削力進(jìn)行實(shí)時(shí)監(jiān)測,將實(shí)驗(yàn)結(jié)果與銑削力理論模型和銑削力有限元仿真模型進(jìn)行對比,驗(yàn)證了銑削力及有限元仿真的正確性。切削力實(shí)驗(yàn)表明,切削力隨切削距離增加而不斷變大。此外,對實(shí)驗(yàn)中使用刀具的刀尖圓弧半徑進(jìn)行檢測,檢測結(jié)果表明刀具刀尖圓弧半徑隨切削距離變大而逐漸變大,這反映了刀具的正常磨損過程。并且這與切削力隨切削距離變化的趨勢大致相同,間接反映了二者之間具有一定的相關(guān)性。在此基礎(chǔ)之上建立了切削力與刀具刀尖圓弧半徑之間的對應(yīng)關(guān)系,他們大致是呈線性關(guān)系。這不但為進(jìn)一步修正激光輔助微銑削切削力模型提供了依據(jù),而且也為利用銑削力實(shí)時(shí)監(jiān)測刀具磨損情況提供了方法。
[Abstract]:Ti6Al4V is widely used in aerospace industry. It can be made into parts of inertial navigation unit and various precision instruments, but its machinability is poor, and cutting force is great in process, and tools are easy to wear. Laser assisted micro milling provides an effective and feasible processing method for this kind of hard working material, which can effectively reduce the milling force and slow down the tool wear. In this paper, the milling force in laser aided micro milling is studied from three aspects: theoretical model establishment, finite element simulation and experimental research. The tool wear is evaluated by the radius of the tool nose circle, and the tool wear in laser assisted micro milling process is studied. On the basis of this, the relationship between the cutting force and the tool wear two is studied. In this paper, the classical model of milling force based on milling force model of traditional micro milling process, on this basis, according to the temperature field of the mathematical model of cutting force of milling machining to change the material mechanical properties and the influence of tool nose radius of laser assisted in micro milling process. In the simulation of the milling force in the laser assisted micro milling, the finite element simulation software ABAQUS is used to simulate the milling force in the laser assisted micro milling. In the study, the three-dimensional simulation of the material stress at different preheating temperatures was first carried out. After that, the laser scanning is simulated. The simulation results show that in a small range of temperature change is very small, so the steady temperature field of cutting at the non steady temperature field is simplified. Finally, the simulation results of temperature field combined with 3D model of milling, and then obtain the laser assisted micro milling 3D model, and the output of the simulation results, the milling force of laser assisted micro milling in comparison with the conventional micro milling. The experiment, this paper respectively conventional micro milling and laser assisted micro milling of two sets of experiments, real-time monitoring of milling force under different parameters, the results of the experiment and finite element simulation model of milling force model and milling force were compared to verify the correctness and the finite Yuan Fangzhen milling force. The cutting force experiment shows that the cutting force increases with the increase of the cutting distance. In addition, the tool nose radius is detected in the experiment. The test results show that the radius of the tool nose radius increases with the cutting distance, which reflects the normal wear process of the tool. And the trend of the cutting force varies with the cutting distance is roughly the same, which indirectly reflects the correlation between the two. On this basis, the corresponding relationship between cutting force and tool tip arc radius is established, and they are approximately linear. It not only provides a basis for further correcting the cutting force model of laser assisted micro milling, but also provides a method for real-time monitoring of tool wear by milling force.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG54

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本文編號(hào)：1342971