發(fā)布時間：2018-08-26 15:38

【摘要】：硬質(zhì)合金材料具有硬度高、耐磨、強度和韌性較好、耐熱、耐腐蝕等優(yōu)良特性,主要應(yīng)用于金屬加工的刀具、地質(zhì)礦山工具、耐磨零件和模具等領(lǐng)域。然而,硬質(zhì)合金的加工性能差,為改善微細(xì)切削硬質(zhì)合金時存在刀具壽命低、加工效率低和加工質(zhì)量差等問題,本文提出了激光誘導(dǎo)氧化輔助微細(xì)銑削復(fù)合加工工藝,利用激光輻射硬質(zhì)合金工件的待加工區(qū)域,使其發(fā)生快速可控氧化,生成結(jié)構(gòu)疏松的氧化物,改善材料的切削性能,大幅度提高加工效率、刀具壽命和加工質(zhì)量。本文進(jìn)行了激光誘導(dǎo)氧化輔助微細(xì)銑削硬質(zhì)合金的基礎(chǔ)研究,主要工作和成果如下:(1)建立了激光輻射下硬質(zhì)合金的三維瞬態(tài)傳熱模型,對脈沖激光輻射下YG20硬質(zhì)合金的溫度場分布進(jìn)行了仿真分析;仿真研究了激光平均功率、激光頻率、掃描速度和光斑直徑等參數(shù)對工件溫度場分布的影響規(guī)律。(2)對YG20硬質(zhì)合金進(jìn)行了常規(guī)氧化試驗,分析了氧化物組分和微觀結(jié)構(gòu)。根據(jù)常規(guī)氧化的試驗結(jié)果和溫度場仿真結(jié)果,對YG20進(jìn)行了激光誘導(dǎo)氧化試驗;分析了激光參數(shù)和氧化環(huán)境對硬質(zhì)合金氧化反應(yīng)的影響規(guī)律,制定了基于疏松氧化物的激光誘導(dǎo)氧化調(diào)控策略。結(jié)果表明:YG20硬質(zhì)合金高溫下的氧化產(chǎn)物主要是CoWO4和WO3;大氣環(huán)境條件下,當(dāng)激光光斑直徑為0.5mm、掃描速度為0.5mm/s、頻率小于33kHz、激光平均功率功率為5~6W時,材料發(fā)生氧化反應(yīng),生成結(jié)構(gòu)疏松的氧化物;功率大于等于7W后,材料發(fā)生融化燒蝕;富氧條件下,功率大于等于6W后,材料即發(fā)生燒蝕,噴射氧氣的氧化輔助作用不明顯。(3)對比分析了激光誘導(dǎo)氧化輔助微細(xì)銑削工藝與微細(xì)銑削工藝,研究了兩種工藝在加工YG20微結(jié)構(gòu)過程中銑削力、加工質(zhì)量和微細(xì)刀具壽命。結(jié)果表明采用激光誘導(dǎo)氧化輔助微細(xì)銑削工藝,可大幅度降低銑削力、提高刀具壽命,相同銑削參數(shù)下,隨著銑削長度的增加,激光誘導(dǎo)氧化輔助微細(xì)銑削加工表面的粗糙度值小于微細(xì)銑削,能得到更好的表面加工質(zhì)量。
[Abstract]:Cemented carbide materials have high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and other excellent properties, mainly used in metal processing tools, geological mining tools, wear-resistant parts and molds and other fields. In this paper, a laser-induced oxidation-assisted micro-milling compound machining process is proposed, in which the area to be processed is irradiated by laser, and the oxides with loose structure are produced. The cutting performance is improved, the machining efficiency, tool life and machining quality are greatly improved. The basic research on laser-induced oxidation assisted micro-milling of cemented carbide is carried out. The main work and achievements are as follows: (1) A three-dimensional transient heat transfer model of cemented carbide under laser irradiation is established, and the temperature field distribution of YG20 cemented carbide under pulsed laser irradiation is simulated and analyzed. (2) The conventional oxidation test of YG20 cemented carbide was carried out, and the oxide composition and microstructure were analyzed. According to the results of conventional oxidation test and simulation results of temperature field, the laser-induced oxidation test of YG20 was carried out, and the laser parameters and oxidation environment were analyzed. The results show that the oxidation products of YG20 cemented carbide at high temperature are mainly CoWO4 and WO3. Under atmospheric environment, when the laser spot diameter is 0.5mm, the scanning speed is 0.5mm/s, the frequency is less than 33 kHz, the average power of laser is 0.5mm/s. When the power is greater than or equal to 7W, the material will melt and ablate; when the power is greater than or equal to 6W, the material will ablate, and the assistant effect of oxygen injection oxidation is not obvious. (3) The laser-induced oxidation assisted micro-milling process and micro-milling worker are compared and analyzed. The results show that the laser-induced oxidation-assisted micro-milling process can greatly reduce the milling force and improve the tool life. Under the same milling parameters, with the increase of milling length, laser-induced oxidation-assisted micro-milling can be added. The roughness of the work surface is smaller than that of the micro milling, and the surface quality can be better.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG54

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本文編號：2205354