超大型筒形锻件制造技术的发展现状

结合大型筒形锻件的制造工序,从冶炼、铸锭、锻造、热处理四个方面介绍了国内外制造大型锻件的新设备和新技术。随着新设备和新技术的发展,制造超大型筒形锻件成为可能。

三维摄影测量系统在大型筒体锻件尺寸测量中的应用

为了确定大型筒体锻件的加工余量,V-STARS三维摄影测量系统应用于大型筒体锻件的尺寸测量中,通过摄影,利用专用软件扫描、计算获得了筒体的三维模型。经过与精加工图的数学模型比较得出了筒体的加工余量,与实际机加工的结果吻合很好。

?9m超大筒节锻件的制造

通过优化和控制炼钢、锻造、热处理等热加工工艺过程,成功制造了?9 m超大筒节锻件。锻件水冒口两端和全截面不同取样部位的性能均满足技术条件要求,且各项性能相对较为均匀。

Effects of whisker surface treatment on microstructure and properties of Al_(18)B_4O_(33w)/6061Al composites

6061Al matrix composites reinforced by ZnO-coated Al18B4O33 whiskers were fabricated by a semi-solid mechanical stirring technique.The effects of ZnO coating on interfacial reaction between whiskers and matrix and the tensile properties of the composites were investigated.Tensile tests on composites were performed at room temperature,and microstructures were observed by scanning electron microscopy(SEM).The results show that the surface treatment of whiskers could reduce interfacial reaction effectively,improve the wettability between whiskers and matrix and enhance the tensile properties of the composites obviously.In addition,semi-solid stirring parameters were also under preliminary study.The stirring parameters were determined by the distribution of whiskers in the composites.The composites with homogeneously distributed whiskers were fabricated by semi-solid stirring at 610 ℃ for 30 min.

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