氟金云母陶瓷车削加工中切削温度实验研究
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摘要
通过硬质合金刀具车削氟金云母陶瓷实验,研究可加工陶瓷切削温度。以特征温度表征切削温度研究氟金云母可加工陶瓷车削加工中的切削温度。结果表明,特征温度随转速的变化幅度小;随着进给速度增大,特征温度整体上是下降的,并且进给速度在0.1~0.12 mm/r间,特征温度下降幅度较大;在特征温度随着切削深度增加而增加的过程中,存在一个下降阶段,而且下降阶段结束后,特征温度增长幅度变大。同一工艺参数下随切削次数的增加,测得的特征温度升高,其原因是:每次切削中,摩擦热主导温度变化,随切削次数的增加,刀具磨损量增大,特征温度升高。由于陶瓷低导热性和脆性,切削温度振颤不明显。
The cutting temperature of machinable ceramics is studied by cutting fluorophlogopite with carbide tools. The representative temperature-characteristic temperature was used to represent cutting temperature to study the cutting temperature of machinable fluorophlogopite ceramics. The results indicate that temperature gets a narrow change range caused by the increasement of rotate speed.With the increasement of feed,the characteristic temperature goes down overall,while the speed goes down rapidly ranging from 0. 1 ~0. 12 mm/r,and the temperature goes down with quite large amplitude. In the process of temperature increasing caused by the increasement of cutting depth,there is a declining stage after which temperature change range becomes bigger. With the increasement of cutting times,the characteristic temperature rises up at the same processing parameter,because the friction heat is the dominant factor of the changes of cutting temperature and with the increasement of cutting times,tool wear increases and temperature goes up. Because of low thermal conductivity and high brittleness of ceramics,the vibration degree of cutting temperature is not obvious.
The cutting temperature of machinable ceramics is studied by cutting fluorophlogopite with carbide tools. The representative temperature-characteristic temperature was used to represent cutting temperature to study the cutting temperature of machinable fluorophlogopite ceramics. The results indicate that temperature gets a narrow change range caused by the increasement of rotate speed.With the increasement of feed,the characteristic temperature goes down overall,while the speed goes down rapidly ranging from 0. 1 ~0. 12 mm/r,and the temperature goes down with quite large amplitude. In the process of temperature increasing caused by the increasement of cutting depth,there is a declining stage after which temperature change range becomes bigger. With the increasement of cutting times,the characteristic temperature rises up at the same processing parameter,because the friction heat is the dominant factor of the changes of cutting temperature and with the increasement of cutting times,tool wear increases and temperature goes up. Because of low thermal conductivity and high brittleness of ceramics,the vibration degree of cutting temperature is not obvious.
引文
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[2]MA L J,YU A B,MEI Z M.Wear Characteristics of Twist Drills in Machining Fluorophlogopite[J].Key Engineering Materials,2007,336:1465-1468.
[3]SINDEL J,PETSCHELT A,GRELLNER F,et al.Evaluation of Subsurface Damage in CAD/CAM Machined Dental Ceramics[J].Journal of Materials Science:Materials in Medicine,1998,9(5):3291-295.
[4]GEBHARDT A,HOCHE T,CARL G,et al.TEM Study on the Origin of Cabbage-shaped Mica Crystal Aggregates in Machinable Glassieramices[J].Act a Materials,1999,47(17):4427-4434.
[5]JAEGER J C.Moving Sources of Heat and the Temperature at Sliding Contacts[J].Journal of the Royal Society of New South Wales,1942,76:203-224.
[6]TRIGGER K J,CHAO B T.An Analytical Evaluation of Metal Cuttingtemperatures[J].Transactions of ASME,1951,73:57-68.
[7]GEBHARDT A,HCHE T,CARL G,et al.TEM Study on the Origin of Cabbage-shaped Mica Crystal Aggregates in Machinable Glass-ceramics[J].Acta Materialia,1999,47(17):4427-4434.
[8]LEOWEN E G,SHAW M C.On the Analysis of Cutting Tool Temperatures[J].Trans.of ASME,1954(7):217-231.
[9]汪国梁.切削加工中的红外测温法[J].机械制造,1983(10):32-34.