本文選題：涂層刀具 + 低溫微量潤(rùn)滑�。� 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：在傳統(tǒng)的切削加工中,為提高加工質(zhì)量,延長(zhǎng)刀具壽命,通常會(huì)使用大量的切削液,這樣不僅會(huì)造成資源浪費(fèi),還會(huì)帶來(lái)環(huán)境污染問(wèn)題。21世紀(jì),人們開(kāi)始倡導(dǎo)“綠色制造”不使用切削液的干式切削技術(shù)備受青睞,尤其是刀具涂層技術(shù)的發(fā)展使得干式切削的應(yīng)用范圍正在不斷擴(kuò)大。但實(shí)踐證明在難加工材料(如耐熱鋼、不銹鋼鈦合金等)和難加工工序(如鉆孔、攻絲、切槽,尤其深孔加工等)的切削加工中,即使使用涂層刀具進(jìn)行干切削加工仍有一定困難,因此,必須研制開(kāi)發(fā)新的冷卻潤(rùn)滑方式。本課題將涂層刀具與微小量潤(rùn)滑(Minimum Quantity Lubrication, MQL)和冷風(fēng)切削技術(shù)結(jié)合,進(jìn)行奧氏體不銹鋼的車(chē)削試驗(yàn)研究具有重要的現(xiàn)實(shí)意義。本次研究針對(duì)奧氏體不銹鋼ICr8Ni9Ti材料,用前刀面和后刀面分別涂覆TiCN+Al_2O_3和TiCN+Al_2O_3+TiN涂層的硬質(zhì)合金金刀片,通過(guò)進(jìn)行車(chē)削試驗(yàn),分析在干切削、不同供液方位的MQL、低溫冷風(fēng)、及低溫MQL條件下切削力的變化規(guī)律,在此基礎(chǔ)上,選擇合適冷卻潤(rùn)滑條件,進(jìn)行刀具磨損試驗(yàn),著重分析了刀具的磨損特性和磨損機(jī)理,試驗(yàn)后觀察切屑形態(tài),分析斷屑的機(jī)理。試驗(yàn)結(jié)果表明:①低溫MQL切削相比于干切削和MQL切削,確實(shí)能夠降低切削區(qū)域的溫度,改善切削加工條件,降低加工過(guò)程中的切削力。②隨冷風(fēng)溫度的降低切削力呈現(xiàn)先減小后增大的趨勢(shì),在切削用量vc=150m/min,f=0.2mm/r,ap=1.5mm,空氣壓力和MQL的流量分別為0.6MPa和33ml/h情況下,冷風(fēng)溫度為-30℃時(shí)切削力最小。③在相同的切削參數(shù)下,切削相同長(zhǎng)度的工件,低溫MQL切削能減小涂層刀具前刀面月牙洼磨損寬度和深度,減小主后刀面邊界磨損和溝槽亙磨損。④從涂層刀具主后刀面的磨損曲線可以直觀的看出,初期磨損階段,三者磨損曲線相差不大,但正常磨損階段,低溫MQL條件下曲線變化平緩,較MQL切削又有所延長(zhǎng),而且從曲線的走勢(shì)看,低溫MQL切削條件下,,刀具的磨鈍標(biāo)準(zhǔn)值可能要大一些。可見(jiàn),低溫MQL條件可以減緩刀具的磨損速率。⑤ 低溫MQL的冷卻潤(rùn)滑作用可以有效降低切削區(qū)域的溫度,改善切削條件,明顯減小磨粒磨損,減小與溫度密切相關(guān)的粘結(jié)磨損,提高刀具壽命。⑥低溫MQL切削條件下切屑為鋸齒形,與干切削和MQL切削相比,塑性流動(dòng)帶最窄,向齒頂擴(kuò)展的面積最小;涂層刀具的斷屑機(jī)理為絕熱剪切。
[Abstract]:In the traditional cutting process, in order to improve the processing quality and prolong the tool life, a large number of cutting fluids are usually used. This will not only cause waste of resources, but also bring about environmental pollution problems in the.21 century. People begin to advocate "green manufacturing" dry cutting technology which does not use cutting fluid, especially the development of tool coating technology. The application scope of dry cutting is expanding. But it has been proved that it is difficult to use coating tools in the cutting process, such as heat-resistant steel, stainless steel, titanium alloy, etc. and difficult machining processes, such as drilling, tapping, cutting, especially deep hole processing. It is of great practical significance to combine the coating tool with the micro lubrication (Minimum Quantity Lubrication, MQL) and the cold air cutting technology in this subject. This study is of great practical significance to the research of the austenitic stainless steel turning test. This study was applied to the austenitic stainless steel ICr8Ni9Ti materials, and the TiCN+Al_ was coated with the front and rear surfaces respectively. 2O_3 and TiCN+Al_2O_3+TiN coated cemented carbide gold blade, through turning test, analyzed the changing law of cutting force in dry cutting, different azimuth of MQL, cold air, and low temperature MQL. On this basis, the suitable cooling condition was selected and the tool wear test was carried out. The wear characteristics and wear of the tool were emphatically analyzed. The mechanism is that the chip morphology is observed after the test and the mechanism of chip breaking is analyzed. The experimental results show that: 1. Compared with dry cutting and MQL cutting, the low temperature MQL cutting can reduce the temperature of the cutting area, improve the cutting conditions and reduce the cutting force in the machining process. The cutting capacity vc=150m/min, f=0.2mm/r, ap=1.5mm, air pressure and MQL flow are 0.6MPa and 33ml/h respectively, and the cold wind temperature is -30 C cutting force minimum. 3. Under the same cutting parameters, cutting the same length of workpiece, low temperature MQL cutting can reduce the wear width and depth of the crescent face of the coated tool face and reduce the main blade surface. It can be seen from the wear curve of the main cutter surface of the coated tool that the three wear curves in the initial stage of wear and tear have little difference, but the normal wear stage, the curve of the low temperature MQL is slow, and the MQL cutting is prolonged, and from the trend of the curve, under the low temperature MQL cutting condition, the cutting tool The standard value of grinding blunt may be larger. It can be seen that the low temperature MQL condition can slow down the wear rate of the tool. 5. The cooling and lubrication of low temperature MQL can effectively reduce the temperature of the cutting area, improve the cutting conditions, reduce the abrasive wear, reduce the bond wear loss closely related to the temperature, and improve the tool life. 6. Under the low temperature MQL cutting condition The chip is zigzag. Compared with dry cutting and MQL cutting, the plastic flow belt is the narrowest and the area extending to the top of the tooth is the smallest. The chip breaking mechanism of the coated tool is adiabatic shearing.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG51;TG142.71

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