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基于复合制冷技术研制1种低温冷风/低温最小量润滑供给装置,使用TiAlN涂层硬质合金刀具进行干切削、最小量润滑(MQL)、低温冷风及低温最小量润滑(低温MQL)条件下镍基高温合金Inconel 718的高速车削试验和淬硬钢AISI D2的高速铣削试验,通过扫描电镜(SEM)和能谱分析(EDS)观察分析硬质合金刀具的磨损形态、磨损机理,研究低温冷风和低温MQL对高速切削难加工材料刀具磨损的影响.结果表明:高速切削Inconel 718和AISI D2时,刀具磨损机理主要为磨料磨损、黏结磨损和扩散磨损;低温冷风和低温MQL可有效降低高速切削时的切削温度,进而防止刀具软化,减小磨料磨损和与温度相关的黏结磨损、扩散磨损,因而可大幅度地提高刀具的使用寿命.
Based on the compound refrigeration technology, a kind of low temperature cold air / low temperature lubrication device was developed. TiAlN coated cemented carbide tools were used for dry cutting, MQL, low temperature and low temperature lubrication (low temperature MQL) High-speed turning test of Inconel 718 and high-speed milling test of hardened steel AISI D2 were carried out. The wear morphology and wear mechanism of carbide cutting tools were observed and analyzed by scanning electron microscope (SEM) and energy spectrum analysis (EDS) The effect of low temperature MQL on the tool wear of high-speed cutting difficult-to-machine materials was studied.The results show that the wear mechanism of the tool is abrasion, bond wear and diffusion wear at high speed in Inconel 718 and AISI D2. Low temperature cold air and low temperature MQL can effectively reduce high speed cutting Of the cutting temperature, thereby preventing the tool softening, reducing abrasive wear and temperature-related bond wear, diffusion wear and tear, which can greatly improve the tool life.