丰田工机新开发的超精密自由曲面加工机

丰田工机在DVD、光通信、数码照相机等精密光学仪器普及的情况下,开发了用于制造较小型、复杂、高精度透镜模具的X、y、Z三轴直线电机驱动的超精密自由曲面加工机--AHN05纳米加工机,可以对透镜模具、各种透镜、反射镜等轴对称型形状、三维自由曲面形状进行切削、磨削加工.该机床的位置检测装置,采用了亚微米分辨力的光栅尺,明显地提高了机械性能,它与磨床、加工中心不同,而是一种新的丰田工机的技术.作为系列产品还有加工直径100mm的AHN10型和加工直径600mm的AHN60-3D型纳米加工机.这是丰田工机为未来市场在高水平技术上的准备.预计2003年这三种机型合计将销售20台.以下重点介绍AHN05机床.

Superelastic behavior of nanostructured Ti_(50)Ni_(48)Co_2 shape memory alloy with cold rolling processing

Effects of cold rolling followed by annealing on microstructural evolution and superelastic properties of the Ti50Ni48Co2 shape memory alloy were investigated. Results showed that during cold rolling, the alloy microstructure evolved through six basic stages including stress-induced martensite transformation and plastic deformation of martensite, deformation twinning, accumulation of dislocations along twin and variant boundaries in martensite, nanocrystallization, amorphization and reverse transformation of martensite to austenite. After annealing at 400 ℃ for 1 h, the amorphous phase formed in the cold-rolled specimens was completely crystallized and an entirely nanocrystalline structure was achieved. The value of stress level of the upper plateau in this nanocrystalline alloy was measured as high as 730 MPa which was significantly higher than that of the coarse-grained Ni50Ti50 and Ti50Ni48Co2 alloys. Moreover, the nanocrystalline Ti50Ni48Co2 alloy had a high damping capacity and considerable efficiency for energy storage.

业界动态

由北京航空制造研究所研制的双龙门四主轴数控机床近日通过中航一集团技术鉴定,可替代同类设备的进口。该机床为龙门移动结构,两个龙门架可分别独立工作;每个龙门上有两个主轴,既可同时加工两个相同的零件,也可使用其中的任意一个主轴加工;工作台面积为2500mm×2600mm;主轴转速达到10000r/min,主轴功率50kW,工作进给速度15000mm/min,可完成飞机零件的高速和高效加工。