论文部分内容阅读
采用红外辐射测温技术对铝合金铣削温度进行了间接的,相似的,直观的测量,主轴转速从2 500 R/M IN 至15 000 R/M IN.所获得的相对温度和相对温度场的结果表明,在主轴转速为7 500 R/M IN 左右时是切削温度为最高的速度临界点.经生产应用证实了这种测温方法和结论是富有成效的.速度临界点的发现将有助于铝合金高速铣削技术的发展.同时相对温度并不相似地反映真实的铣削温度,而是间接相似地反映传入零件加工表面的切削热所产生的温度.“,”C. Slolmon predicted theoretically that at a critical milling speed, milling temperature stops increasing and starts decreasing [1] . But P.Lezanski et al did experiments up to a milling speed of 479 m/min for one aluminum alloy without obtaining such a critical milling speed [2] . We did milling experiments on Chinese LY12 aluminum alloy (corresponding nearly to ASTM 2024) and found that such a critical milling speed very likely exists. We did not measure milling temperature. Instead we measured the temperature of the milled workpiece with inframetrics and call it “relative” milling temperature, which is of much significance in successful milling, Fig.1 shows schematically how the “relative” milling temperature was measured. Fig.3 shows the variation of “relative” milling temperature with r/min of milling machine. The curves for workpiece thicknesses of 3.0 mm and 4.5 mm respectively both peak at about 7 500 r/min.