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作 者:刘旭[1] 孙玉利[1] 张桂冠 钱炳坤 高航[2] 左敦稳[1] LIU Xu;SUN Yuli;ZHANG Guiguan;QIAN Bingkun;GAO Hang;ZUO Dunwen(College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016;School of Mechanical Engineering,Dalian University of Technology,Dalian,Liaoning,116024)
机构地区:[1]南京航空航天大学机电学院,南京210016 [2]大连理工大学机械工程学院,大连116024
出 处:《中国机械工程》2022年第18期2161-2171,共11页China Mechanical Engineering
基 金:国家自然科学基金(52075254);大连理工大学精密与特种加工教育部重点实验室研究基金(JMTZ201901);江苏省研究生科研与实践创新计划(KYCX20_0183)。
摘 要:为探究低温微磨料气射流加工聚二甲基硅氧烷(PDMS)微流道过程中PDMS试样受液氮射流冲击冷却的温度变化和分布,提出了测温实验Beck反求算法拟合APDL温度场仿真的系统研究方法,仿真结果与测温结果的误差仅1.735%。仿真发现,表面到达明显脆化温度-147℃需要5.747 s,说明PDMS无法在接触液氮的瞬间就达到可加工的脆化状态,有必要重视加工前的预冷却时间;又通过仿真数据拟合了PDMS冷却至-147℃的冷却速度,以冷却速度为参考预测了实际加工中所需的预冷却时间。对比冷却速度发现,距PDMS试样表面0~100μm深度范围内的冷却速度比0~1500μm深度范围内冷却速度快22.054%,PDMS试样放置在铝合金工作台上的冷却速度比绝热工作台上快22.311%。In order to explore the changes and distributions of the temperature of PDMS sample being impacted and cooled by the liquid nitrogen jet during the cryogenic micro-abrasive air jet machining the PDMS microchannels,this paper proposed a systematic research method of temperature that composed of temperature measurement experiments,Beck's inverse estimation method fitting and APDL temperature field simulation.The errors between the final simulation results and the temperature measurement ones are only 1.735%.The simulations find that it will take 5.747 s for the surfaces to reach the obvious embrittlement temperature -147℃.PDMS may not reach a machinable embrittlement state at the moment of contact with liquid nitrogen,so it is necessary to pay attention to the pre-cooling time before machining.The simulation data was used to fit the cooling rate of PDMS to -147℃,and the cooling rate was used as a reference to predict the pre-cooling time required in the actual machining.By comparing the cooling rate,it is found that the cooling rate in the depth range of 0~100μm from the surface of the PDMS specimen is 22.054% faster than that in the depth range of 0~1500μm,and the cooling rate of the aluminum alloy workbench is about 22.311% higher than that of the adiabatic workbench.
关 键 词:聚二甲基硅氧烷(PDMS) 低温微磨料气射流 Beck反算法 APDL温度场仿真
分 类 号:TH145.4[一般工业技术—材料科学与工程] TB324[机械工程—机械制造及自动化]
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